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Ensemble RXTX satisfaction

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  • Sivan
    I just completed my first 2 QSO s in a long long time using my Ensemble RXTX on 20m PSK using Rocky. I also used a home-brewed 16W linear (basically the
    Message 1 of 22 , Sep 2, 2010
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      I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.

      I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.

      The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.

      I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).

      Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.

      Regards, Sivan 4X6IZ
    • Ken Chase
      Hi Sivan I need some kind of inexpensive compact antenna. Just getting back into the hobby and just finished my v9.0. Mind sharing with me your magnetic loop
      Message 2 of 22 , Sep 2, 2010
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        Hi Sivan
         
        I need some kind of inexpensive compact antenna. Just getting back into the hobby and just finished my v9.0. Mind sharing with me your magnetic loop antenna?
         
        Thanks
         
        Ken
         
         
        ----- Original Message -----
        From: Sivan
        Sent: Thursday, September 02, 2010 11:13 AM
        Subject: [softrock40] Ensemble RXTX satisfaction

         

        I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.

        I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.

        The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.

        I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).

        Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.

        Regards, Sivan 4X6IZ

      • Sid Boyce
        ... http://www.oe1ira.at/sl/loop.html http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm My first magloop was for 40m using a 3/8 soft copper loop 3 feet in diameter
        Message 3 of 22 , Sep 2, 2010
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          On 03/09/10 03:54, Ken Chase wrote:
          >
          >
          > Hi Sivan
          > I need some kind of inexpensive compact antenna. Just getting back into
          > the hobby and just finished my v9.0. Mind sharing with me your magnetic
          > loop antenna?
          > Thanks
          > Ken
          >
          http://www.oe1ira.at/sl/loop.html
          http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
          My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
          diameter and tuned with a normal variable capacitor that was not very
          wide spaced and which arced over with >7W. I worked all over Europe with
          it positioned indoors on the landing using 7W. The beauty is they don't
          need height.

          The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
          degree elbows tuned with a motor driven vacuum capacitor, but it got
          destroyed by high winds and the capacitor smashed when it fell. With
          that all my 80m contacts across to the States were made (100W). One day
          when I figure out how to keep it up securely I shall rebuild it.

          The current one is 8 feet diameter made with 22mm copper and 45 degree
          elbows, tuned with a motor driven vacuum capacitor capable of handling
          100W and it's for 80m and 40m. It's mounted on a piece of wood and
          clamped to a stout iron tube in concrete with the bottom of the loop 4
          feet above ground on a concreted area.

          There are programs on the web so you can model the loop before deciding
          what copper, shape, etc. you intend to build. Some guys have used
          aluminium tube and others have used aluminium curtain rod for loops.

          I've had most success with gamma matching to support more than one
          band, though others have had success using the coupling loop. I could
          only get 1:1 SWR on one band and lousy on the other when going for
          160/80 or 80/40. The gamma match does the job, I just find the tap that
          gives ~1:1 SWR on 160/80m or 80/40 with my loops.

          A loop for 20m - 10m is small enough to build easily. One guy put up one
          after his beam got destroyed and he was able to keep his daily sked with
          VK/ZL.
          Danger, on TX many KV exists across the capacitor, so if tuning by hand,
          use an insulated shaft extension. A reduction gear also makes tuning
          less critical.

          Bottom line, they work, work well and are not critical to set up either.
          73 ... Sid.

          --
          Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
          Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
          Senior Staff Specialist, Cricket Coach
          Microsoft Windows Free Zone - Linux used for all Computing Tasks
        • Dave - WB6DHW
          Sivan: Depends on your defination of inexpensive and compact. A dipole or inverted vee is cheap and if you wind the wire on each side onto a core, can be
          Message 4 of 22 , Sep 2, 2010
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            Sivan:
              Depends on your defination of inexpensive and compact.  A dipole or inverted vee is cheap and if you wind the wire on each side onto a core, can be compact to move.
              If you want to spend a little money,  <www.s9antennas.com> makes some lightweight verticles that collapse down to a small pack.  They also have very good reveiws on eham.  The 31 foot(40 to 6 meters) is $89.95 and the 43 foot(80 to 6) is $139.95.

            Dave - WB6DHW
            <http://wb6dhw.com>

            On 9/2/2010 7:54 PM, Ken Chase wrote:
            Hi Sivan
             
            I need some kind of inexpensive compact antenna. Just getting back into the hobby and just finished my v9.0. Mind sharing with me your magnetic loop antenna?
             
            Thanks
             
            Ken
             
             
            ----- Original Message -----
            From: Sivan
            Sent: Thursday, September 02, 2010 11:13 AM
            Subject: [softrock40] Ensemble RXTX satisfaction

             

            I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.

            I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.

            The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.

            I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).

            Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.

            Regards, Sivan 4X6IZ


          • Ken Chase
            Hi Sid I m just RX ing for now and I m limited in space for an antenna. I have a lot of relearning to do and I don t want to spend a lot of time and expense
            Message 5 of 22 , Sep 3, 2010
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              Hi Sid

              I'm just RX'ing for now and I'm limited in space for an antenna. I have a
              lot of relearning to do and I don't want to spend a lot of time and expense
              right now. Just need something simple and compact. Just want to stick to 80m
              and 40m (possibly 20m )for now.

              Thanks Sid

              Ken
              ----- Original Message -----
              From: "Sid Boyce" <sboyce@...>
              To: <softrock40@yahoogroups.com>
              Sent: Friday, September 03, 2010 12:15 AM
              Subject: [softrock40] Re: Magenetic loops


              > On 03/09/10 03:54, Ken Chase wrote:
              >>
              >>
              >> Hi Sivan
              >> I need some kind of inexpensive compact antenna. Just getting back into
              >> the hobby and just finished my v9.0. Mind sharing with me your magnetic
              >> loop antenna?
              >> Thanks
              >> Ken
              >>
              > http://www.oe1ira.at/sl/loop.html
              > http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
              > My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
              > diameter and tuned with a normal variable capacitor that was not very
              > wide spaced and which arced over with >7W. I worked all over Europe with
              > it positioned indoors on the landing using 7W. The beauty is they don't
              > need height.
              >
              > The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
              > degree elbows tuned with a motor driven vacuum capacitor, but it got
              > destroyed by high winds and the capacitor smashed when it fell. With
              > that all my 80m contacts across to the States were made (100W). One day
              > when I figure out how to keep it up securely I shall rebuild it.
              >
              > The current one is 8 feet diameter made with 22mm copper and 45 degree
              > elbows, tuned with a motor driven vacuum capacitor capable of handling
              > 100W and it's for 80m and 40m. It's mounted on a piece of wood and
              > clamped to a stout iron tube in concrete with the bottom of the loop 4
              > feet above ground on a concreted area.
              >
              > There are programs on the web so you can model the loop before deciding
              > what copper, shape, etc. you intend to build. Some guys have used
              > aluminium tube and others have used aluminium curtain rod for loops.
              >
              > I've had most success with gamma matching to support more than one
              > band, though others have had success using the coupling loop. I could
              > only get 1:1 SWR on one band and lousy on the other when going for
              > 160/80 or 80/40. The gamma match does the job, I just find the tap that
              > gives ~1:1 SWR on 160/80m or 80/40 with my loops.
              >
              > A loop for 20m - 10m is small enough to build easily. One guy put up one
              > after his beam got destroyed and he was able to keep his daily sked with
              > VK/ZL.
              > Danger, on TX many KV exists across the capacitor, so if tuning by hand,
              > use an insulated shaft extension. A reduction gear also makes tuning
              > less critical.
              >
              > Bottom line, they work, work well and are not critical to set up either.
              > 73 ... Sid.
              >
              > --
              > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
              > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
              > Senior Staff Specialist, Cricket Coach
              > Microsoft Windows Free Zone - Linux used for all Computing Tasks
              >
              >
              >
              > ------------------------------------
              >
              > Yahoo! Groups Links
              >
              >
              >
            • Sylvain AZARIAN
              Hi Ken, If you intend to use the RX at night mainly, keep the antenna short ;-) The noise on these bands is high and lots of broadcast stations are received (
              Message 6 of 22 , Sep 3, 2010
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                Hi Ken,

                If you intend to use the RX at night mainly, keep the antenna short ;-) The noise on these bands is high and lots of broadcast stations are received ( in europe we have nice chinese broadcast, S9+60dB ....)
                I would recommend a simple wire plus parrallel circuit ( L+C tuned on the band). You do not really need to match impedance...
                I've had nice results with a single wire about 2meters long and ground connected to the water pipes ;-)

                F4GKR - sylvain 

                2010/9/3 Ken Chase <chase8043@...>
                Hi Sid

                I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                lot of relearning to do and I don't want to spend a lot of time and expense
                right now. Just need something simple and compact. Just want to stick to 80m
                and 40m (possibly 20m )for now.

                Thanks Sid

                Ken
                ----- Original Message -----
                From: "Sid Boyce" <sboyce@...>
                To: <softrock40@yahoogroups.com>
                Sent: Friday, September 03, 2010 12:15 AM
                Subject: [softrock40] Re: Magenetic loops


                > On 03/09/10 03:54, Ken Chase wrote:
                >>
                >>
                >> Hi Sivan
                >> I need some kind of inexpensive compact antenna. Just getting back into
                >> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                >> loop antenna?
                >> Thanks
                >> Ken
                >>
                > http://www.oe1ira.at/sl/loop.html
                > http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                > My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                > diameter and tuned with a normal variable capacitor that was not very
                > wide spaced and which arced over with >7W. I worked all over Europe with
                > it positioned indoors on the landing using 7W. The beauty is they don't
                > need height.
                >
                > The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                > degree elbows tuned with a motor driven vacuum capacitor, but it got
                > destroyed by high winds and the capacitor smashed when it fell. With
                > that all my 80m contacts across to the States were made (100W). One day
                > when I figure out how to keep it up securely I shall rebuild it.
                >
                > The current one is 8 feet diameter made with 22mm copper and 45 degree
                > elbows, tuned with a motor driven vacuum capacitor capable of handling
                > 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                > clamped to a stout iron tube in concrete with the bottom of the loop 4
                > feet above ground on a concreted area.
                >
                > There are programs on the web so you can model the loop before deciding
                > what copper, shape, etc. you intend to build. Some guys have used
                > aluminium tube and others have used aluminium curtain rod for loops.
                >
                > I've had most success with gamma matching to support more than one
                > band, though others have had success using the coupling loop. I could
                > only get 1:1 SWR on one band and lousy on the other when going for
                > 160/80 or 80/40. The gamma match does the job, I just find the tap that
                > gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                >
                > A loop for 20m - 10m is small enough to build easily. One guy put up one
                > after his beam got destroyed and he was able to keep his daily sked with
                > VK/ZL.
                > Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                > use an insulated shaft extension. A reduction gear also makes tuning
                > less critical.
                >
                > Bottom line, they work, work well and are not critical to set up either.
                > 73 ... Sid.
                >
                > --
                > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                > Senior Staff Specialist, Cricket Coach
                > Microsoft Windows Free Zone - Linux used for all Computing Tasks
                >
                >
                >
                > ------------------------------------
                >
                > Yahoo! Groups Links
                >
                >
                >



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              • Ken Chase
                Thanks Dave These are something I can check into when I m ready to TX as well. Ken ... From: Dave - WB6DHW To: softrock40@yahoogroups.com Sent: Friday,
                Message 7 of 22 , Sep 3, 2010
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                  Thanks Dave
                   
                  These are something I can check into when I'm ready to TX as well.
                   
                  Ken
                   
                  ----- Original Message -----
                  Sent: Friday, September 03, 2010 2:11 AM
                  Subject: Re: [softrock40] Ensemble RXTX satisfaction

                   

                  Sivan:
                    Depends on your defination of inexpensive and compact.  A dipole or inverted vee is cheap and if you wind the wire on each side onto a core, can be compact to move.
                    If you want to spend a little money,  <www.s9antennas.com> makes some lightweight verticles that collapse down to a small pack.  They also have very good reveiws on eham.  The 31 foot(40 to 6 meters) is $89.95 and the 43 foot(80 to 6) is $139.95.

                  Dave - WB6DHW
                  <http://wb6dhw.com>

                  On 9/2/2010 7:54 PM, Ken Chase wrote:

                  Hi Sivan
                   
                  I need some kind of inexpensive compact antenna. Just getting back into the hobby and just finished my v9.0. Mind sharing with me your magnetic loop antenna?
                   
                  Thanks
                   
                  Ken
                   
                   
                  ----- Original Message -----
                  From: Sivan
                  Sent: Thursday, September 02, 2010 11:13 AM
                  Subject: [softrock40] Ensemble RXTX satisfaction

                   

                  I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.

                  I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.

                  The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.

                  I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).

                  Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.

                  Regards, Sivan 4X6IZ


                • Ken Chase
                  Hi Sylvain If I can get away with a single wire and ground then thats the way I will go. Appreciate your reply. Thanks Ken ... From: Sylvain AZARIAN To:
                  Message 8 of 22 , Sep 3, 2010
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                    Hi Sylvain
                     
                    If I can get away with a single wire and ground then thats the way I will go.
                     
                    Appreciate your reply.
                     
                    Thanks
                     
                    Ken
                     
                    ----- Original Message -----
                    Sent: Friday, September 03, 2010 6:35 AM
                    Subject: Re: [softrock40] Re: Magenetic loops

                     

                    Hi Ken,


                    If you intend to use the RX at night mainly, keep the antenna short ;-) The noise on these bands is high and lots of broadcast stations are received ( in europe we have nice chinese broadcast, S9+60dB ....)
                    I would recommend a simple wire plus parrallel circuit ( L+C tuned on the band). You do not really need to match impedance...
                    I've had nice results with a single wire about 2meters long and ground connected to the water pipes ;-)

                    F4GKR - sylvain 

                    2010/9/3 Ken Chase <chase8043@...>
                    Hi Sid

                    I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                    lot of relearning to do and I don't want to spend a lot of time and expense
                    right now. Just need something simple and compact. Just want to stick to 80m
                    and 40m (possibly 20m )for now.

                    Thanks Sid

                    Ken
                    ----- Original Message -----
                    From: "Sid Boyce" <sboyce@...>
                    To: <softrock40@yahoogroups.com>
                    Sent: Friday, September 03, 2010 12:15 AM
                    Subject: [softrock40] Re: Magenetic loops


                    > On 03/09/10 03:54, Ken Chase wrote:
                    >>
                    >>
                    >> Hi Sivan
                    >> I need some kind of inexpensive compact antenna. Just getting back into
                    >> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                    >> loop antenna?
                    >> Thanks
                    >> Ken
                    >>
                    > http://www.oe1ira.at/sl/loop.html
                    > http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                    > My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                    > diameter and tuned with a normal variable capacitor that was not very
                    > wide spaced and which arced over with >7W. I worked all over Europe with
                    > it positioned indoors on the landing using 7W. The beauty is they don't
                    > need height.
                    >
                    > The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                    > degree elbows tuned with a motor driven vacuum capacitor, but it got
                    > destroyed by high winds and the capacitor smashed when it fell. With
                    > that all my 80m contacts across to the States were made (100W). One day
                    > when I figure out how to keep it up securely I shall rebuild it.
                    >
                    > The current one is 8 feet diameter made with 22mm copper and 45 degree
                    > elbows, tuned with a motor driven vacuum capacitor capable of handling
                    > 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                    > clamped to a stout iron tube in concrete with the bottom of the loop 4
                    > feet above ground on a concreted area.
                    >
                    > There are programs on the web so you can model the loop before deciding
                    > what copper, shape, etc. you intend to build. Some guys have used
                    > aluminium tube and others have used aluminium curtain rod for loops.
                    >
                    > I've had most success with gamma matching to support more than one
                    > band, though others have had success using the coupling loop. I could
                    > only get 1:1 SWR on one band and lousy on the other when going for
                    > 160/80 or 80/40. The gamma match does the job, I just find the tap that
                    > gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                    >
                    > A loop for 20m - 10m is small enough to build easily. One guy put up one
                    > after his beam got destroyed and he was able to keep his daily sked with
                    > VK/ZL.
                    > Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                    > use an insulated shaft extension. A reduction gear also makes tuning
                    > less critical.
                    >
                    > Bottom line, they work, work well and are not critical to set up either.
                    > 73 ... Sid.
                    >
                    > --
                    > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                    > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                    > Senior Staff Specialist, Cricket Coach
                    > Microsoft Windows Free Zone - Linux used for all Computing Tasks
                    >
                    >
                    >
                    > ------------------------------------
                    >
                    > Yahoo! Groups Links
                    >
                    >
                    >



                    ------------------------------------

                    Yahoo! Groups Links

                    <*> To visit your group on the web, go to:
                       http://groups.yahoo.com/group/softrock40/

                    <*> Your email settings:
                       Individual Email | Traditional

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                       http://groups.yahoo.com/group/softrock40/join
                       (Yahoo! ID required)

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                  • Sid Boyce
                    OK, my first magloop was cheap and took less than an hour from bending to attaching to the rig - very simple. The one advantage I noticed - 40m was quiet, then
                    Message 9 of 22 , Sep 3, 2010
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                      OK, my first magloop was cheap and took less than an hour from bending
                      to attaching to the rig - very simple. The one advantage I noticed - 40m
                      was quiet, then I remembered the ability of the magloop to null out
                      noise and interfering signals coming from another direction, turned it
                      broadside to the electricity pylons over the road and bang up came the
                      noise.
                      No TVI problems to neighbours either.

                      There are other cheap options like a 1/2 size G5RV and various indoor
                      wire arrangements.
                      Reasons for me choosing the magnetic loop was the low demand on space
                      (I already have a multi-band quad on a tower), performance at low height
                      and even indoors.

                      You are spoiled for choice, just that some options perform reasonably
                      well and some poor.
                      73 ... Sid.

                      On 03/09/10 11:27, Ken Chase wrote:
                      > Hi Sid
                      >
                      > I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                      > lot of relearning to do and I don't want to spend a lot of time and expense
                      > right now. Just need something simple and compact. Just want to stick to 80m
                      > and 40m (possibly 20m )for now.
                      >
                      > Thanks Sid
                      >
                      > Ken
                      > ----- Original Message -----
                      > From: "Sid Boyce"<sboyce@...>
                      > To:<softrock40@yahoogroups.com>
                      > Sent: Friday, September 03, 2010 12:15 AM
                      > Subject: [softrock40] Re: Magenetic loops
                      >
                      >
                      >> On 03/09/10 03:54, Ken Chase wrote:
                      >>>
                      >>>
                      >>> Hi Sivan
                      >>> I need some kind of inexpensive compact antenna. Just getting back into
                      >>> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                      >>> loop antenna?
                      >>> Thanks
                      >>> Ken
                      >>>
                      >> http://www.oe1ira.at/sl/loop.html
                      >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                      >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                      >> diameter and tuned with a normal variable capacitor that was not very
                      >> wide spaced and which arced over with>7W. I worked all over Europe with
                      >> it positioned indoors on the landing using 7W. The beauty is they don't
                      >> need height.
                      >>
                      >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                      >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                      >> destroyed by high winds and the capacitor smashed when it fell. With
                      >> that all my 80m contacts across to the States were made (100W). One day
                      >> when I figure out how to keep it up securely I shall rebuild it.
                      >>
                      >> The current one is 8 feet diameter made with 22mm copper and 45 degree
                      >> elbows, tuned with a motor driven vacuum capacitor capable of handling
                      >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                      >> clamped to a stout iron tube in concrete with the bottom of the loop 4
                      >> feet above ground on a concreted area.
                      >>
                      >> There are programs on the web so you can model the loop before deciding
                      >> what copper, shape, etc. you intend to build. Some guys have used
                      >> aluminium tube and others have used aluminium curtain rod for loops.
                      >>
                      >> I've had most success with gamma matching to support more than one
                      >> band, though others have had success using the coupling loop. I could
                      >> only get 1:1 SWR on one band and lousy on the other when going for
                      >> 160/80 or 80/40. The gamma match does the job, I just find the tap that
                      >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                      >>
                      >> A loop for 20m - 10m is small enough to build easily. One guy put up one
                      >> after his beam got destroyed and he was able to keep his daily sked with
                      >> VK/ZL.
                      >> Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                      >> use an insulated shaft extension. A reduction gear also makes tuning
                      >> less critical.
                      >>
                      >> Bottom line, they work, work well and are not critical to set up either.
                      >> 73 ... Sid.
                      >>

                      --
                      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                      Senior Staff Specialist, Cricket Coach
                      Microsoft Windows Free Zone - Linux used for all Computing Tasks
                    • Sylvain AZARIAN
                      I agree : magnetic loop will reduce significantly noise... I had seen on the net a small loop with varactor and variable resistor to set central frequency and
                      Message 10 of 22 , Sep 3, 2010
                      • 0 Attachment
                        I agree : magnetic loop will reduce significantly noise... 
                        I had seen on the net a small loop with varactor and variable resistor to set central frequency and bandwith but I cannot find it ....
                        Maybe googling "varactor bandpass filter" would help

                        F4GKR - Sylvain

                        2010/9/3 Sid Boyce <sboyce@...>
                         

                        OK, my first magloop was cheap and took less than an hour from bending
                        to attaching to the rig - very simple. The one advantage I noticed - 40m
                        was quiet, then I remembered the ability of the magloop to null out
                        noise and interfering signals coming from another direction, turned it
                        broadside to the electricity pylons over the road and bang up came the
                        noise.
                        No TVI problems to neighbours either.

                        There are other cheap options like a 1/2 size G5RV and various indoor
                        wire arrangements.
                        Reasons for me choosing the magnetic loop was the low demand on space
                        (I already have a multi-band quad on a tower), performance at low height
                        and even indoors.

                        You are spoiled for choice, just that some options perform reasonably
                        well and some poor.
                        73 ... Sid.



                        On 03/09/10 11:27, Ken Chase wrote:
                        > Hi Sid
                        >
                        > I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                        > lot of relearning to do and I don't want to spend a lot of time and expense
                        > right now. Just need something simple and compact. Just want to stick to 80m
                        > and 40m (possibly 20m )for now.
                        >
                        > Thanks Sid
                        >
                        > Ken
                        > ----- Original Message -----
                        > From: "Sid Boyce"<sboyce@...>
                        > To:<softrock40@yahoogroups.com>
                        > Sent: Friday, September 03, 2010 12:15 AM
                        > Subject: [softrock40] Re: Magenetic loops
                        >
                        >
                        >> On 03/09/10 03:54, Ken Chase wrote:
                        >>>
                        >>>
                        >>> Hi Sivan
                        >>> I need some kind of inexpensive compact antenna. Just getting back into
                        >>> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                        >>> loop antenna?
                        >>> Thanks
                        >>> Ken
                        >>>
                        >> http://www.oe1ira.at/sl/loop.html
                        >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                        >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                        >> diameter and tuned with a normal variable capacitor that was not very
                        >> wide spaced and which arced over with>7W. I worked all over Europe with
                        >> it positioned indoors on the landing using 7W. The beauty is they don't
                        >> need height.
                        >>
                        >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                        >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                        >> destroyed by high winds and the capacitor smashed when it fell. With
                        >> that all my 80m contacts across to the States were made (100W). One day
                        >> when I figure out how to keep it up securely I shall rebuild it.
                        >>
                        >> The current one is 8 feet diameter made with 22mm copper and 45 degree
                        >> elbows, tuned with a motor driven vacuum capacitor capable of handling
                        >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                        >> clamped to a stout iron tube in concrete with the bottom of the loop 4
                        >> feet above ground on a concreted area.
                        >>
                        >> There are programs on the web so you can model the loop before deciding
                        >> what copper, shape, etc. you intend to build. Some guys have used
                        >> aluminium tube and others have used aluminium curtain rod for loops.
                        >>
                        >> I've had most success with gamma matching to support more than one
                        >> band, though others have had success using the coupling loop. I could
                        >> only get 1:1 SWR on one band and lousy on the other when going for
                        >> 160/80 or 80/40. The gamma match does the job, I just find the tap that
                        >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                        >>
                        >> A loop for 20m - 10m is small enough to build easily. One guy put up one
                        >> after his beam got destroyed and he was able to keep his daily sked with
                        >> VK/ZL.
                        >> Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                        >> use an insulated shaft extension. A reduction gear also makes tuning
                        >> less critical.
                        >>
                        >> Bottom line, they work, work well and are not critical to set up either.
                        >> 73 ... Sid.
                        >>

                        --
                        Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                        Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                        Senior Staff Specialist, Cricket Coach
                        Microsoft Windows Free Zone - Linux used for all Computing Tasks


                      • k5nwa
                        Another beautiful thing about a mag loop is that it s a really sharp resonant antenna which helps in having a clean signal on the air, but you have to retune
                        Message 11 of 22 , Sep 3, 2010
                        • 0 Attachment
                          Another beautiful thing about a mag loop is that it's a really sharp
                          resonant antenna which helps in having a clean signal on the air, but
                          you have to retune very often. They are great for receiving antennas
                          also due to the factors you mentioned.

                          At 07:01 AM 9/3/2010, you wrote:
                          >OK, my first magloop was cheap and took less than an hour from bending
                          >to attaching to the rig - very simple. The one advantage I noticed - 40m
                          >was quiet, then I remembered the ability of the magloop to null out
                          >noise and interfering signals coming from another direction, turned it
                          >broadside to the electricity pylons over the road and bang up came the
                          >noise.
                          >No TVI problems to neighbours either.
                          >
                          >There are other cheap options like a 1/2 size G5RV and various indoor
                          >wire arrangements.
                          >Reasons for me choosing the magnetic loop was the low demand on space
                          >(I already have a multi-band quad on a tower), performance at low height
                          >and even indoors.
                          >
                          >You are spoiled for choice, just that some options perform reasonably
                          >well and some poor.
                          >73 ... Sid.
                          >
                          >On 03/09/10 11:27, Ken Chase wrote:
                          > > Hi Sid
                          > >
                          > > I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                          > > lot of relearning to do and I don't want to spend a lot of time and expense
                          > > right now. Just need something simple and compact. Just want to
                          > stick to 80m
                          > > and 40m (possibly 20m )for now.
                          > >
                          > > Thanks Sid
                          > >
                          > > Ken
                          > > ----- Original Message -----
                          > > From: "Sid Boyce"<sboyce@...>
                          > > To:<softrock40@yahoogroups.com>
                          > > Sent: Friday, September 03, 2010 12:15 AM
                          > > Subject: [softrock40] Re: Magenetic loops
                          > >
                          > >
                          > >> On 03/09/10 03:54, Ken Chase wrote:
                          > >>>
                          > >>>
                          > >>> Hi Sivan
                          > >>> I need some kind of inexpensive compact antenna. Just getting back into
                          > >>> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                          > >>> loop antenna?
                          > >>> Thanks
                          > >>> Ken
                          > >>>
                          > >> http://www.oe1ira.at/sl/loop.html
                          > >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                          > >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                          > >> diameter and tuned with a normal variable capacitor that was not very
                          > >> wide spaced and which arced over with>7W. I worked all over Europe with
                          > >> it positioned indoors on the landing using 7W. The beauty is they don't
                          > >> need height.
                          > >>
                          > >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                          > >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                          > >> destroyed by high winds and the capacitor smashed when it fell. With
                          > >> that all my 80m contacts across to the States were made (100W). One day
                          > >> when I figure out how to keep it up securely I shall rebuild it.
                          > >>
                          > >> The current one is 8 feet diameter made with 22mm copper and 45 degree
                          > >> elbows, tuned with a motor driven vacuum capacitor capable of handling
                          > >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                          > >> clamped to a stout iron tube in concrete with the bottom of the loop 4
                          > >> feet above ground on a concreted area.
                          > >>
                          > >> There are programs on the web so you can model the loop before deciding
                          > >> what copper, shape, etc. you intend to build. Some guys have used
                          > >> aluminium tube and others have used aluminium curtain rod for loops.
                          > >>
                          > >> I've had most success with gamma matching to support more than one
                          > >> band, though others have had success using the coupling loop. I could
                          > >> only get 1:1 SWR on one band and lousy on the other when going for
                          > >> 160/80 or 80/40. The gamma match does the job, I just find the tap that
                          > >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                          > >>
                          > >> A loop for 20m - 10m is small enough to build easily. One guy put up one
                          > >> after his beam got destroyed and he was able to keep his daily sked with
                          > >> VK/ZL.
                          > >> Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                          > >> use an insulated shaft extension. A reduction gear also makes tuning
                          > >> less critical.
                          > >>
                          > >> Bottom line, they work, work well and are not critical to set up either.
                          > >> 73 ... Sid.
                          > >>
                          >
                          >--
                          >Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                          >Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                          >Senior Staff Specialist, Cricket Coach
                          >Microsoft Windows Free Zone - Linux used for all Computing Tasks
                          >
                          >
                          >
                          >------------------------------------
                          >
                          >Yahoo! Groups Links
                          >
                          >
                          >
                          Cecil
                          k5nwa
                          < www.softrockradio.org > < www.qrpradio.com >
                          < http://parts.softrockradio.org/ >

                          Never take life seriously. Nobody gets out alive anyway.
                        • k5nwa
                          Another inexpensive loop antenna is the DCL antenna made from twilead. ... Cecil k5nwa
                          Message 12 of 22 , Sep 3, 2010
                          • 0 Attachment
                            Another inexpensive loop antenna is the DCL antenna made from twilead.

                            At 07:01 AM 9/3/2010, you wrote:
                            >OK, my first magloop was cheap and took less than an hour from bending
                            >to attaching to the rig - very simple. The one advantage I noticed - 40m
                            >was quiet, then I remembered the ability of the magloop to null out
                            >noise and interfering signals coming from another direction, turned it
                            >broadside to the electricity pylons over the road and bang up came the
                            >noise.
                            >No TVI problems to neighbours either.
                            >
                            >There are other cheap options like a 1/2 size G5RV and various indoor
                            >wire arrangements.
                            >Reasons for me choosing the magnetic loop was the low demand on space
                            >(I already have a multi-band quad on a tower), performance at low height
                            >and even indoors.
                            >
                            >You are spoiled for choice, just that some options perform reasonably
                            >well and some poor.
                            >73 ... Sid.
                            >
                            >On 03/09/10 11:27, Ken Chase wrote:
                            > > Hi Sid
                            > >
                            > > I'm just RX'ing for now and I'm limited in space for an antenna. I have a
                            > > lot of relearning to do and I don't want to spend a lot of time and expense
                            > > right now. Just need something simple and compact. Just want to
                            > stick to 80m
                            > > and 40m (possibly 20m )for now.
                            > >
                            > > Thanks Sid
                            > >
                            > > Ken
                            > > ----- Original Message -----
                            > > From: "Sid Boyce"<sboyce@...>
                            > > To:<softrock40@yahoogroups.com>
                            > > Sent: Friday, September 03, 2010 12:15 AM
                            > > Subject: [softrock40] Re: Magenetic loops
                            > >
                            > >
                            > >> On 03/09/10 03:54, Ken Chase wrote:
                            > >>>
                            > >>>
                            > >>> Hi Sivan
                            > >>> I need some kind of inexpensive compact antenna. Just getting back into
                            > >>> the hobby and just finished my v9.0. Mind sharing with me your magnetic
                            > >>> loop antenna?
                            > >>> Thanks
                            > >>> Ken
                            > >>>
                            > >> http://www.oe1ira.at/sl/loop.html
                            > >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                            > >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                            > >> diameter and tuned with a normal variable capacitor that was not very
                            > >> wide spaced and which arced over with>7W. I worked all over Europe with
                            > >> it positioned indoors on the landing using 7W. The beauty is they don't
                            > >> need height.
                            > >>
                            > >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                            > >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                            > >> destroyed by high winds and the capacitor smashed when it fell. With
                            > >> that all my 80m contacts across to the States were made (100W). One day
                            > >> when I figure out how to keep it up securely I shall rebuild it.
                            > >>
                            > >> The current one is 8 feet diameter made with 22mm copper and 45 degree
                            > >> elbows, tuned with a motor driven vacuum capacitor capable of handling
                            > >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                            > >> clamped to a stout iron tube in concrete with the bottom of the loop 4
                            > >> feet above ground on a concreted area.
                            > >>
                            > >> There are programs on the web so you can model the loop before deciding
                            > >> what copper, shape, etc. you intend to build. Some guys have used
                            > >> aluminium tube and others have used aluminium curtain rod for loops.
                            > >>
                            > >> I've had most success with gamma matching to support more than one
                            > >> band, though others have had success using the coupling loop. I could
                            > >> only get 1:1 SWR on one band and lousy on the other when going for
                            > >> 160/80 or 80/40. The gamma match does the job, I just find the tap that
                            > >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                            > >>
                            > >> A loop for 20m - 10m is small enough to build easily. One guy put up one
                            > >> after his beam got destroyed and he was able to keep his daily sked with
                            > >> VK/ZL.
                            > >> Danger, on TX many KV exists across the capacitor, so if tuning by hand,
                            > >> use an insulated shaft extension. A reduction gear also makes tuning
                            > >> less critical.
                            > >>
                            > >> Bottom line, they work, work well and are not critical to set up either.
                            > >> 73 ... Sid.
                            > >>
                            >
                            >--
                            >Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                            >Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                            >Senior Staff Specialist, Cricket Coach
                            >Microsoft Windows Free Zone - Linux used for all Computing Tasks
                            >
                            >
                            >
                            >------------------------------------
                            >
                            >Yahoo! Groups Links
                            >
                            >
                            >
                            Cecil
                            k5nwa
                            < www.softrockradio.org > < www.qrpradio.com >
                            < http://parts.softrockradio.org/ >

                            Never take life seriously. Nobody gets out alive anyway.
                          • Sivan
                            Hi Ken, I see that you already got a lot of useful answers from people with a lot more experience with loops than me. Still, I uploaded a fairly detailed of
                            Message 13 of 22 , Sep 3, 2010
                            • 0 Attachment
                              Hi Ken,

                              I see that you already got a lot of useful answers from people with a lot more experience with loops than me. Still, I uploaded a fairly detailed of the loop I built to http://sivantoledotech.wordpress.com/ . It is easy to build but might not be easy to replicate, because I used some kind of water pipe that somebody discarded and might not be widely available.

                              To Dave: I know that dipoles and variants work very well. 25 years ago I had a 20m dipole that was about 15m high and it worked beautifully. But in the apartment building where I live now I can't put one up. Thanks for the advice.

                              Regards, Sivan

                              --- In softrock40@yahoogroups.com, "Ken Chase" <chase8043@...> wrote:
                              >
                              > Hi Sivan
                              >
                              > I need some kind of inexpensive compact antenna. Just getting back into the hobby and just finished my v9.0. Mind sharing with me your magnetic loop antenna?
                              >
                              > Thanks
                              >
                              > Ken
                              >
                              >
                              > ----- Original Message -----
                              > From: Sivan
                              > To: softrock40@yahoogroups.com
                              > Sent: Thursday, September 02, 2010 11:13 AM
                              > Subject: [softrock40] Ensemble RXTX satisfaction
                              >
                              >
                              >
                              > I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.
                              >
                              > I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.
                              >
                              > The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.
                              >
                              > I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).
                              >
                              > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                              >
                              > Regards, Sivan 4X6IZ
                              >
                            • Sid Boyce
                              http://www.techlib.com/electronics/antennas.html Or may be this one. home.earthlink.net/~christrask/Indoor%20Loop%20Antenna.pdf They seem complex by
                              Message 14 of 22 , Sep 3, 2010
                              • 0 Attachment
                                http://www.techlib.com/electronics/antennas.html
                                Or may be this one.
                                home.earthlink.net/~christrask/Indoor%20Loop%20Antenna.pdf
                                They seem complex by comparison, needing varactor diodes that may not be
                                to hand, power and in one case an IC also.
                                A loop made of coax, a variable capacitor and a stiff piece of 14 gauge
                                wire or coax for a gamma match are more often to hand or easily obtained
                                and a reduced component count.
                                73 ... Sid.

                                On 03/09/10 13:04, Sylvain AZARIAN wrote:
                                >
                                >
                                > I agree : magnetic loop will reduce significantly noise...
                                >
                                > I had seen on the net a small loop with varactor and variable resistor
                                > to set central frequency and bandwith but I cannot find it ....
                                > Maybe googling "varactor bandpass filter" would help
                                >
                                > F4GKR - Sylvain
                                >
                                > 2010/9/3 Sid Boyce <sboyce@...
                                > <mailto:sboyce@...>>
                                >
                                > OK, my first magloop was cheap and took less than an hour from bending
                                > to attaching to the rig - very simple. The one advantage I noticed -
                                > 40m
                                > was quiet, then I remembered the ability of the magloop to null out
                                > noise and interfering signals coming from another direction, turned it
                                > broadside to the electricity pylons over the road and bang up came the
                                > noise.
                                > No TVI problems to neighbours either.
                                >
                                > There are other cheap options like a 1/2 size G5RV and various indoor
                                > wire arrangements.
                                > Reasons for me choosing the magnetic loop was the low demand on space
                                > (I already have a multi-band quad on a tower), performance at low
                                > height
                                > and even indoors.
                                >
                                > You are spoiled for choice, just that some options perform reasonably
                                > well and some poor.
                                > 73 ... Sid.
                                >
                                >
                                >
                                > On 03/09/10 11:27, Ken Chase wrote:
                                > > Hi Sid
                                > >
                                > > I'm just RX'ing for now and I'm limited in space for an antenna.
                                > I have a
                                > > lot of relearning to do and I don't want to spend a lot of time
                                > and expense
                                > > right now. Just need something simple and compact. Just want to
                                > stick to 80m
                                > > and 40m (possibly 20m )for now.
                                > >
                                > > Thanks Sid
                                > >
                                > > Ken
                                > > ----- Original Message -----
                                > > From: "Sid Boyce"<sboyce@...
                                > <mailto:sboyce%40blueyonder.co.uk>>
                                > > To:<softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>>
                                > > Sent: Friday, September 03, 2010 12:15 AM
                                > > Subject: [softrock40] Re: Magenetic loops
                                > >
                                > >
                                > >> On 03/09/10 03:54, Ken Chase wrote:
                                > >>>
                                > >>>
                                > >>> Hi Sivan
                                > >>> I need some kind of inexpensive compact antenna. Just getting
                                > back into
                                > >>> the hobby and just finished my v9.0. Mind sharing with me your
                                > magnetic
                                > >>> loop antenna?
                                > >>> Thanks
                                > >>> Ken
                                > >>>
                                > >> http://www.oe1ira.at/sl/loop.html
                                > >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                                > >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                                > >> diameter and tuned with a normal variable capacitor that was not
                                > very
                                > >> wide spaced and which arced over with>7W. I worked all over
                                > Europe with
                                > >> it positioned indoors on the landing using 7W. The beauty is
                                > they don't
                                > >> need height.
                                > >>
                                > >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                                > >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                                > >> destroyed by high winds and the capacitor smashed when it fell. With
                                > >> that all my 80m contacts across to the States were made (100W).
                                > One day
                                > >> when I figure out how to keep it up securely I shall rebuild it.
                                > >>
                                > >> The current one is 8 feet diameter made with 22mm copper and 45
                                > degree
                                > >> elbows, tuned with a motor driven vacuum capacitor capable of
                                > handling
                                > >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                                > >> clamped to a stout iron tube in concrete with the bottom of the
                                > loop 4
                                > >> feet above ground on a concreted area.
                                > >>
                                > >> There are programs on the web so you can model the loop before
                                > deciding
                                > >> what copper, shape, etc. you intend to build. Some guys have used
                                > >> aluminium tube and others have used aluminium curtain rod for loops.
                                > >>
                                > >> I've had most success with gamma matching to support more than one
                                > >> band, though others have had success using the coupling loop. I
                                > could
                                > >> only get 1:1 SWR on one band and lousy on the other when going for
                                > >> 160/80 or 80/40. The gamma match does the job, I just find the
                                > tap that
                                > >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                                > >>
                                > >> A loop for 20m - 10m is small enough to build easily. One guy
                                > put up one
                                > >> after his beam got destroyed and he was able to keep his daily
                                > sked with
                                > >> VK/ZL.
                                > >> Danger, on TX many KV exists across the capacitor, so if tuning
                                > by hand,
                                > >> use an insulated shaft extension. A reduction gear also makes tuning
                                > >> less critical.
                                > >>
                                > >> Bottom line, they work, work well and are not critical to set up
                                > either.
                                > >> 73 ... Sid.



                                --
                                Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                                Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                                Senior Staff Specialist, Cricket Coach
                                Microsoft Windows Free Zone - Linux used for all Computing Tasks
                              • flyboy_ont
                                Hi Sivan Thanks for the idea and thanks to everyone else for helping out. Guess what I need to do now is decide. More surfing is needed. Thanks again All Ken
                                Message 15 of 22 , Sep 3, 2010
                                • 0 Attachment
                                  Hi Sivan

                                  Thanks for the idea and thanks to everyone else for helping out. Guess what I need to do now is decide. More surfing is needed.

                                  Thanks again All

                                  Ken

                                  --- In softrock40@yahoogroups.com, "Sivan" <sivan.toledo@...> wrote:
                                  >
                                  > Hi Ken,
                                  >
                                  > I see that you already got a lot of useful answers from people with a
                                  > lot more experience with loops than me. Still, I uploaded a fairly
                                  > detailed of the loop I built to http://sivantoledotech.wordpress.com/
                                  > <%20http://sivantoledotech.wordpress.com/> . It is easy to build but
                                  > might not be easy to replicate, because I used some kind of water pipe
                                  > that somebody discarded and might not be widely available.
                                  >
                                  > To Dave: I know that dipoles and variants work very well. 25 years ago I
                                  > had a 20m dipole that was about 15m high and it worked beautifully. But
                                  > in the apartment building where I live now I can't put one up. Thanks
                                  > for the advice.
                                  >
                                  > Regards, Sivan
                                  >
                                  > --- In softrock40@yahoogroups.com, "Ken Chase" <chase8043@> wrote:
                                  > >
                                  > > Hi Sivan
                                  > >
                                  > > I need some kind of inexpensive compact antenna. Just getting back
                                  > into the hobby and just finished my v9.0. Mind sharing with me your
                                  > magnetic loop antenna?
                                  > >
                                  > > Thanks
                                  > >
                                  > > Ken
                                  > >
                                  > >
                                  > > ----- Original Message -----
                                  > > From: Sivan
                                  > > To: softrock40@yahoogroups.com
                                  > > Sent: Thursday, September 02, 2010 11:13 AM
                                  > > Subject: [softrock40] Ensemble RXTX satisfaction
                                  > >
                                  > >
                                  > >
                                  > > I just completed my first 2 QSO's in a long long time using my
                                  > Ensemble RXTX on 20m PSK using Rocky.
                                  > >
                                  > > I also used a home-brewed 16W linear (basically the mini-boots
                                  > amplifier with the Genesis 2030 output network). Antenna is a magnetic
                                  > loop about a foot outside my first-floor balcony.
                                  > >
                                  > > The only real snag I had was that for some reason that I can't
                                  > understand, I had to use different jumper setting (crossed/straight) for
                                  > the line-in and line-out. I can't figure this out, but until I did this,
                                  > I transmitted only on the image frequency, not the RX frequency. Maybe
                                  > the left/right are crossed in my sound card. Very weird.
                                  > >
                                  > > I also modded the Ensemble to support Rocky's VNA architecture. This
                                  > came is handy in verifying the tuning of the antenna (I actually tuned
                                  > it using a resistive bridge, but the VNA feature is pretty cool).
                                  > >
                                  > > Thanks to all those who helped me along: Tony, Robby, Alex, and
                                  > Earl.
                                  > >
                                  > > Regards, Sivan 4X6IZ
                                  > >
                                  >
                                • Sylvain AZARIAN
                                  Nice ;-) The second link was exactly the one I saw a while ago ... Thanks ! F4GKR - Sylvain 2010/9/3 Sid Boyce
                                  Message 16 of 22 , Sep 3, 2010
                                  • 0 Attachment
                                    Nice ;-)
                                    The second link was exactly the one I saw a while ago ...
                                    Thanks !

                                    F4GKR - Sylvain

                                    2010/9/3 Sid Boyce <sboyce@...>
                                    http://www.techlib.com/electronics/antennas.html
                                    Or may be this one.
                                    home.earthlink.net/~christrask/Indoor%20Loop%20Antenna.pdf
                                    They seem complex by comparison, needing varactor diodes that may not be
                                    to hand, power and in one case an IC also.
                                    A loop made of coax, a variable capacitor and a stiff piece of 14 gauge
                                    wire or coax for a gamma match are more often to hand or easily obtained
                                    and a reduced component count.
                                    73 ... Sid.

                                    On 03/09/10 13:04, Sylvain AZARIAN wrote:
                                    >
                                    >
                                    > I agree : magnetic loop will reduce significantly noise...
                                    >
                                    > I had seen on the net a small loop with varactor and variable resistor
                                    > to set central frequency and bandwith but I cannot find it ....
                                    > Maybe googling "varactor bandpass filter" would help
                                    >
                                    > F4GKR - Sylvain
                                    >
                                    > 2010/9/3 Sid Boyce <sboyce@...
                                    > <mailto:sboyce@...>>
                                    >
                                    >     OK, my first magloop was cheap and took less than an hour from bending
                                    >     to attaching to the rig - very simple. The one advantage I noticed -
                                    >     40m
                                    >     was quiet, then I remembered the ability of the magloop to null out
                                    >     noise and interfering signals coming from another direction, turned it
                                    >     broadside to the electricity pylons over the road and bang up came the
                                    >     noise.
                                    >     No TVI problems to neighbours either.
                                    >
                                    >     There are other cheap options like a 1/2 size G5RV and various indoor
                                    >     wire arrangements.
                                    >     Reasons for me choosing the magnetic loop was the low demand on space
                                    >     (I already have a multi-band quad on a tower), performance at low
                                    >     height
                                    >     and even indoors.
                                    >
                                    >     You are spoiled for choice, just that some options perform reasonably
                                    >     well and some poor.
                                    >     73 ... Sid.
                                    >
                                    >
                                    >
                                    >     On 03/09/10 11:27, Ken Chase wrote:
                                    >      > Hi Sid
                                    >      >
                                    >      > I'm just RX'ing for now and I'm limited in space for an antenna.
                                    >     I have a
                                    >      > lot of relearning to do and I don't want to spend a lot of time
                                    >     and expense
                                    >      > right now. Just need something simple and compact. Just want to
                                    >     stick to 80m
                                    >      > and 40m (possibly 20m )for now.
                                    >      >
                                    >      > Thanks Sid
                                    >      >
                                    >      > Ken
                                    >      > ----- Original Message -----
                                    >      > From: "Sid Boyce"<sboyce@...
                                    >     <mailto:sboyce%40blueyonder.co.uk>>
                                    >      > To:<softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>>
                                    >      > Sent: Friday, September 03, 2010 12:15 AM
                                    >      > Subject: [softrock40] Re: Magenetic loops
                                    >      >
                                    >      >
                                    >      >> On 03/09/10 03:54, Ken Chase wrote:
                                    >      >>>
                                    >      >>>
                                    >      >>> Hi Sivan
                                    >      >>> I need some kind of inexpensive compact antenna. Just getting
                                    >     back into
                                    >      >>> the hobby and just finished my v9.0. Mind sharing with me your
                                    >     magnetic
                                    >      >>> loop antenna?
                                    >      >>> Thanks
                                    >      >>> Ken
                                    >      >>>
                                    >      >> http://www.oe1ira.at/sl/loop.html
                                    >      >> http://www.qsl.net/mnqrp/Loop/Mag_Loops.htm
                                    >      >> My first magloop was for 40m using a 3/8" soft copper loop 3 feet in
                                    >      >> diameter and tuned with a normal variable capacitor that was not
                                    >     very
                                    >      >> wide spaced and which arced over with>7W. I worked all over
                                    >     Europe with
                                    >      >> it positioned indoors on the landing using 7W. The beauty is
                                    >     they don't
                                    >      >> need height.
                                    >      >>
                                    >      >> The next was a hexagonal loop 28mm copper (13 feet diameter) with 45
                                    >      >> degree elbows tuned with a motor driven vacuum capacitor, but it got
                                    >      >> destroyed by high winds and the capacitor smashed when it fell. With
                                    >      >> that all my 80m contacts across to the States were made (100W).
                                    >     One day
                                    >      >> when I figure out how to keep it up securely I shall rebuild it.
                                    >      >>
                                    >      >> The current one is 8 feet diameter made with 22mm copper and 45
                                    >     degree
                                    >      >> elbows, tuned with a motor driven vacuum capacitor capable of
                                    >     handling
                                    >      >> 100W and it's for 80m and 40m. It's mounted on a piece of wood and
                                    >      >> clamped to a stout iron tube in concrete with the bottom of the
                                    >     loop 4
                                    >      >> feet above ground on a concreted area.
                                    >      >>
                                    >      >> There are programs on the web so you can model the loop before
                                    >     deciding
                                    >      >> what copper, shape, etc. you intend to build. Some guys have used
                                    >      >> aluminium tube and others have used aluminium curtain rod for loops.
                                    >      >>
                                    >      >> I've had most success with gamma matching to support more than one
                                    >      >> band, though others have had success using the coupling loop. I
                                    >     could
                                    >      >> only get 1:1 SWR on one band and lousy on the other when going for
                                    >      >> 160/80 or 80/40. The gamma match does the job, I just find the
                                    >     tap that
                                    >      >> gives ~1:1 SWR on 160/80m or 80/40 with my loops.
                                    >      >>
                                    >      >> A loop for 20m - 10m is small enough to build easily. One guy
                                    >     put up one
                                    >      >> after his beam got destroyed and he was able to keep his daily
                                    >     sked with
                                    >      >> VK/ZL.
                                    >      >> Danger, on TX many KV exists across the capacitor, so if tuning
                                    >     by hand,
                                    >      >> use an insulated shaft extension. A reduction gear also makes tuning
                                    >      >> less critical.
                                    >      >>
                                    >      >> Bottom line, they work, work well and are not critical to set up
                                    >     either.
                                    >      >> 73 ... Sid.



                                    --
                                    Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                                    Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                                    Senior Staff Specialist, Cricket Coach
                                    Microsoft Windows Free Zone - Linux used for all Computing Tasks



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                                  • Sid Boyce
                                    Further research won t do any harm as it allows you to evaluate several solutions then choose one, build it and start using it. One day I was playing with a
                                    Message 17 of 22 , Sep 3, 2010
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                                      Further research won't do any harm as it allows you to evaluate several
                                      solutions then choose one, build it and start using it.

                                      One day I was playing with a loop design program I had written and
                                      forgotten about when I heard a discussion of loops on 80m and joined in.
                                      The advice was simple and direct - build one. Two days later when I had
                                      the copper and after less than 1 hour's work I was active on 40m with it.
                                      73 ... Sid.

                                      On 03/09/10 15:13, flyboy_ont wrote:
                                      >
                                      >
                                      > Hi Sivan
                                      >
                                      > Thanks for the idea and thanks to everyone else for helping out. Guess
                                      > what I need to do now is decide. More surfing is needed.
                                      >
                                      > Thanks again All
                                      >
                                      > Ken
                                      >
                                      > --- In softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>,
                                      > "Sivan" <sivan.toledo@...> wrote:
                                      > >
                                      > > Hi Ken,
                                      > >
                                      > > I see that you already got a lot of useful answers from people with a
                                      > > lot more experience with loops than me. Still, I uploaded a fairly
                                      > > detailed of the loop I built to http://sivantoledotech.wordpress.com/
                                      > > <%20http://sivantoledotech.wordpress.com/> . It is easy to build but
                                      > > might not be easy to replicate, because I used some kind of water pipe
                                      > > that somebody discarded and might not be widely available.
                                      > >
                                      > > To Dave: I know that dipoles and variants work very well. 25 years ago I
                                      > > had a 20m dipole that was about 15m high and it worked beautifully. But
                                      > > in the apartment building where I live now I can't put one up. Thanks
                                      > > for the advice.
                                      > >
                                      > > Regards, Sivan
                                      > >
                                      > > --- In softrock40@yahoogroups.com
                                      > <mailto:softrock40%40yahoogroups.com>, "Ken Chase" <chase8043@> wrote:
                                      > > >
                                      > > > Hi Sivan
                                      > > >
                                      > > > I need some kind of inexpensive compact antenna. Just getting back
                                      > > into the hobby and just finished my v9.0. Mind sharing with me your
                                      > > magnetic loop antenna?
                                      > > >
                                      > > > Thanks
                                      > > >
                                      > > > Ken
                                      > > >
                                      > > >
                                      > > > ----- Original Message -----
                                      > > > From: Sivan
                                      > > > To: softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>
                                      > > > Sent: Thursday, September 02, 2010 11:13 AM
                                      > > > Subject: [softrock40] Ensemble RXTX satisfaction
                                      > > >
                                      > > >
                                      > > >
                                      > > > I just completed my first 2 QSO's in a long long time using my
                                      > > Ensemble RXTX on 20m PSK using Rocky.
                                      > > >
                                      > > > I also used a home-brewed 16W linear (basically the mini-boots
                                      > > amplifier with the Genesis 2030 output network). Antenna is a magnetic
                                      > > loop about a foot outside my first-floor balcony.
                                      > > >
                                      > > > The only real snag I had was that for some reason that I can't
                                      > > understand, I had to use different jumper setting (crossed/straight) for
                                      > > the line-in and line-out. I can't figure this out, but until I did this,
                                      > > I transmitted only on the image frequency, not the RX frequency. Maybe
                                      > > the left/right are crossed in my sound card. Very weird.
                                      > > >
                                      > > > I also modded the Ensemble to support Rocky's VNA architecture. This
                                      > > came is handy in verifying the tuning of the antenna (I actually tuned
                                      > > it using a resistive bridge, but the VNA feature is pretty cool).
                                      > > >
                                      > > > Thanks to all those who helped me along: Tony, Robby, Alex, and
                                      > > Earl.
                                      > > >
                                      > > > Regards, Sivan 4X6IZ
                                      > > >

                                      --
                                      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                                      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                                      Senior Staff Specialist, Cricket Coach
                                      Microsoft Windows Free Zone - Linux used for all Computing Tasks
                                    • Yannick
                                      Hi Sivan, I experienced the same soundcard problem here on a PC. For PowerSDR, the RX (line-in) has to be wire straight and the TX (line-out) crossed. On my
                                      Message 18 of 22 , Sep 3, 2010
                                      • 0 Attachment
                                        Hi Sivan,

                                        I experienced the same soundcard problem here on a PC.
                                        For PowerSDR, the RX (line-in) has to be wire straight and the TX (line-out) crossed.
                                        On my iMac no problem...

                                        For now I stay with around 200mW for QRSS and WSPR experiments.
                                        I have a 2,5w in, 100w out linear waiting. I just have to wire a TX/RX switching relay and I should have around 20w out from the SoftRock. Enough for most digital modes...

                                        73,
                                        Yan - XV4TUJ.

                                        --- In softrock40@yahoogroups.com, "Sivan" <sivan.toledo@...> wrote:
                                        >
                                        > I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.
                                        >
                                        > I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.
                                        >
                                        > The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.
                                        >
                                        > I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).
                                        >
                                        > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                                        >
                                        > Regards, Sivan 4X6IZ
                                        >
                                      • Sivan
                                        Good to know I m not alone :-) I thought I must be crazy. I think what I ll do is prepare a couple of crossed audio cables, so by just switching from a
                                        Message 19 of 22 , Sep 3, 2010
                                        • 0 Attachment
                                          Good to know I'm not alone :-) I thought I must be crazy.

                                          I think what I'll do is prepare a couple of "crossed" audio cables, so by just switching from a straight to a crossed cable I would be able to fix such problems, go from Rocky to Power SDR, etc.

                                          --- In softrock40@yahoogroups.com, "Yannick" <yannick.devos@...> wrote:
                                          >
                                          > Hi Sivan,
                                          >
                                          > I experienced the same soundcard problem here on a PC.
                                          > For PowerSDR, the RX (line-in) has to be wire straight and the TX (line-out) crossed.
                                          > On my iMac no problem...
                                          >
                                          > For now I stay with around 200mW for QRSS and WSPR experiments.
                                          > I have a 2,5w in, 100w out linear waiting. I just have to wire a TX/RX switching relay and I should have around 20w out from the SoftRock. Enough for most digital modes...
                                          >
                                          > 73,
                                          > Yan - XV4TUJ.
                                          >
                                          > --- In softrock40@yahoogroups.com, "Sivan" <sivan.toledo@> wrote:
                                          > >
                                          > > I just completed my first 2 QSO's in a long long time using my Ensemble RXTX on 20m PSK using Rocky.
                                          > >
                                          > > I also used a home-brewed 16W linear (basically the mini-boots amplifier with the Genesis 2030 output network). Antenna is a magnetic loop about a foot outside my first-floor balcony.
                                          > >
                                          > > The only real snag I had was that for some reason that I can't understand, I had to use different jumper setting (crossed/straight) for the line-in and line-out. I can't figure this out, but until I did this, I transmitted only on the image frequency, not the RX frequency. Maybe the left/right are crossed in my sound card. Very weird.
                                          > >
                                          > > I also modded the Ensemble to support Rocky's VNA architecture. This came is handy in verifying the tuning of the antenna (I actually tuned it using a resistive bridge, but the VNA feature is pretty cool).
                                          > >
                                          > > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                                          > >
                                          > > Regards, Sivan 4X6IZ
                                          > >
                                          >
                                        • KU7Y
                                          Why not just put in a DPDT switch in the audio out cable to change the I/Q lines? OK, back in my hole, Ron, KU7Y SOWP 5545M Caldwell, ID ku7y@qsl.net ... From:
                                          Message 20 of 22 , Sep 3, 2010
                                          • 0 Attachment
                                            Why not just put in a DPDT switch in the audio out cable to change the I/Q
                                            lines?

                                            OK, back in my hole,

                                            Ron, KU7Y
                                            SOWP 5545M
                                            Caldwell, ID
                                            ku7y@...
                                            ----- Original Message -----
                                            From: Sivan
                                            To: softrock40@yahoogroups.com
                                            Sent: Friday, September 03, 2010 9:48 AM
                                            Subject: [softrock40] Re: Ensemble RXTX satisfaction



                                            Good to know I'm not alone :-) I thought I must be crazy.

                                            I think what I'll do is prepare a couple of "crossed" audio cables, so by
                                            just switching from a straight to a crossed cable I would be able to fix
                                            such problems, go from Rocky to Power SDR, etc.

                                            --- In softrock40@yahoogroups.com, "Yannick" <yannick.devos@...> wrote:
                                            >
                                            > Hi Sivan,
                                            >
                                            > I experienced the same soundcard problem here on a PC.
                                            > For PowerSDR, the RX (line-in) has to be wire straight and the TX
                                            > (line-out) crossed.
                                            > On my iMac no problem...
                                            >
                                            > For now I stay with around 200mW for QRSS and WSPR experiments.
                                            > I have a 2,5w in, 100w out linear waiting. I just have to wire a TX/RX
                                            > switching relay and I should have around 20w out from the SoftRock. Enough
                                            > for most digital modes...
                                            >
                                            > 73,
                                            > Yan - XV4TUJ.
                                            >
                                            > --- In softrock40@yahoogroups.com, "Sivan" <sivan.toledo@> wrote:
                                            > >
                                            > > I just completed my first 2 QSO's in a long long time using my Ensemble
                                            > > RXTX on 20m PSK using Rocky.
                                            > >
                                            > > I also used a home-brewed 16W linear (basically the mini-boots amplifier
                                            > > with the Genesis 2030 output network). Antenna is a magnetic loop about
                                            > > a foot outside my first-floor balcony.
                                            > >
                                            > > The only real snag I had was that for some reason that I can't
                                            > > understand, I had to use different jumper setting (crossed/straight) for
                                            > > the line-in and line-out. I can't figure this out, but until I did this,
                                            > > I transmitted only on the image frequency, not the RX frequency. Maybe
                                            > > the left/right are crossed in my sound card. Very weird.
                                            > >
                                            > > I also modded the Ensemble to support Rocky's VNA architecture. This
                                            > > came is handy in verifying the tuning of the antenna (I actually tuned
                                            > > it using a resistive bridge, but the VNA feature is pretty cool).
                                            > >
                                            > > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                                            > >
                                            > > Regards, Sivan 4X6IZ
                                            > >
                                            >
                                          • hsvham
                                            That s what I plan to do on my Ensemble II RX  as I build up the board and put it in its enclosure...   Steve K4KM ... From: KU7Y
                                            Message 21 of 22 , Sep 3, 2010
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                                              That's what I plan to do on my Ensemble II RX  as I build up the board and put it in its enclosure...
                                               
                                              Steve
                                              K4KM

                                              --- On Fri, 9/3/10, KU7Y <ku7y.cw@...> wrote:

                                              From: KU7Y <ku7y.cw@...>
                                              Subject: Re: [softrock40] Re: Ensemble RXTX satisfaction
                                              To: softrock40@yahoogroups.com
                                              Date: Friday, September 3, 2010, 10:58 AM

                                               
                                              Why not just put in a DPDT switch in the audio out cable to change the I/Q
                                              lines?

                                              OK, back in my hole,

                                              Ron, KU7Y
                                              SOWP 5545M
                                              Caldwell, ID
                                              ku7y@...
                                              ----- Original Message -----
                                              From: Sivan
                                              To: softrock40@yahoogroups.com
                                              Sent: Friday, September 03, 2010 9:48 AM
                                              Subject: [softrock40] Re: Ensemble RXTX satisfaction

                                              Good to know I'm not alone :-) I thought I must be crazy.

                                              I think what I'll do is prepare a couple of "crossed" audio cables, so by
                                              just switching from a straight to a crossed cable I would be able to fix
                                              such problems, go from Rocky to Power SDR, etc.

                                              --- In softrock40@yahoogroups.com, "Yannick" <yannick.devos@...> wrote:
                                              >
                                              > Hi Sivan,
                                              >
                                              > I experienced the same soundcard problem here on a PC.
                                              > For PowerSDR, the RX (line-in) has to be wire straight and the TX
                                              > (line-out) crossed.
                                              > On my iMac no problem...
                                              >
                                              > For now I stay with around 200mW for QRSS and WSPR experiments.
                                              > I have a 2,5w in, 100w out linear waiting. I just have to wire a TX/RX
                                              > switching relay and I should have around 20w out from the SoftRock. Enough
                                              > for most digital modes...
                                              >
                                              > 73,
                                              > Yan - XV4TUJ.
                                              >
                                              > --- In softrock40@yahoogroups.com, "Sivan" <sivan.toledo@> wrote:
                                              > >
                                              > > I just completed my first 2 QSO's in a long long time using my Ensemble
                                              > > RXTX on 20m PSK using Rocky.
                                              > >
                                              > > I also used a home-brewed 16W linear (basically the mini-boots amplifier
                                              > > with the Genesis 2030 output network). Antenna is a magnetic loop about
                                              > > a foot outside my first-floor balcony.
                                              > >
                                              > > The only real snag I had was that for some reason that I can't
                                              > > understand, I had to use different jumper setting (crossed/straight) for
                                              > > the line-in and line-out. I can't figure this out, but until I did this,
                                              > > I transmitted only on the image frequency, not the RX frequency. Maybe
                                              > > the left/right are crossed in my sound card. Very weird.
                                              > >
                                              > > I also modded the Ensemble to support Rocky's VNA architecture. This
                                              > > came is handy in verifying the tuning of the antenna (I actually tuned
                                              > > it using a resistive bridge, but the VNA feature is pretty cool).
                                              > >
                                              > > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                                              > >
                                              > > Regards, Sivan 4X6IZ
                                              > >
                                              >


                                            • Sid Boyce
                                              The simplest solutions are often not the ones thought of. Reminds me of when I was asked to design and produce a circuit to power off our mainframes in the UK
                                              Message 22 of 22 , Sep 3, 2010
                                              • 0 Attachment
                                                The simplest solutions are often not the ones thought of.

                                                Reminds me of when I was asked to design and produce a circuit to power
                                                off our mainframes in the UK when one phase of a 3-phase supply was lost.
                                                2 transformers, 1 diode bridge and an electrolytic capacitor did the job
                                                flawlessly throughout the life of over 50 installations.
                                                Our Corporate design guy's official answer was a board festooned with
                                                IC's, TO-39 cans, resistors, capacitors and hell knows what else that
                                                activated the same power off sequence when connected to the same points.

                                                Sadly I never met the guy to ask him a very relevant "what the hell"
                                                question.
                                                73 ... Sid.

                                                On 03/09/10 16:58, KU7Y wrote:
                                                >
                                                >
                                                > Why not just put in a DPDT switch in the audio out cable to change the I/Q
                                                > lines?
                                                >
                                                > OK, back in my hole,
                                                >
                                                > Ron, KU7Y
                                                > SOWP 5545M
                                                > Caldwell, ID
                                                > ku7y@... <mailto:ku7y%40qsl.net>
                                                > ----- Original Message -----
                                                > From: Sivan
                                                > To: softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>
                                                > Sent: Friday, September 03, 2010 9:48 AM
                                                > Subject: [softrock40] Re: Ensemble RXTX satisfaction
                                                >
                                                > Good to know I'm not alone :-) I thought I must be crazy.
                                                >
                                                > I think what I'll do is prepare a couple of "crossed" audio cables, so by
                                                > just switching from a straight to a crossed cable I would be able to fix
                                                > such problems, go from Rocky to Power SDR, etc.
                                                >
                                                > --- In softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com>,
                                                > "Yannick" <yannick.devos@...> wrote:
                                                > >
                                                > > Hi Sivan,
                                                > >
                                                > > I experienced the same soundcard problem here on a PC.
                                                > > For PowerSDR, the RX (line-in) has to be wire straight and the TX
                                                > > (line-out) crossed.
                                                > > On my iMac no problem...
                                                > >
                                                > > For now I stay with around 200mW for QRSS and WSPR experiments.
                                                > > I have a 2,5w in, 100w out linear waiting. I just have to wire a TX/RX
                                                > > switching relay and I should have around 20w out from the SoftRock.
                                                > Enough
                                                > > for most digital modes...
                                                > >
                                                > > 73,
                                                > > Yan - XV4TUJ.
                                                > >
                                                > > --- In softrock40@yahoogroups.com
                                                > <mailto:softrock40%40yahoogroups.com>, "Sivan" <sivan.toledo@> wrote:
                                                > > >
                                                > > > I just completed my first 2 QSO's in a long long time using my
                                                > Ensemble
                                                > > > RXTX on 20m PSK using Rocky.
                                                > > >
                                                > > > I also used a home-brewed 16W linear (basically the mini-boots
                                                > amplifier
                                                > > > with the Genesis 2030 output network). Antenna is a magnetic loop
                                                > about
                                                > > > a foot outside my first-floor balcony.
                                                > > >
                                                > > > The only real snag I had was that for some reason that I can't
                                                > > > understand, I had to use different jumper setting
                                                > (crossed/straight) for
                                                > > > the line-in and line-out. I can't figure this out, but until I did
                                                > this,
                                                > > > I transmitted only on the image frequency, not the RX frequency. Maybe
                                                > > > the left/right are crossed in my sound card. Very weird.
                                                > > >
                                                > > > I also modded the Ensemble to support Rocky's VNA architecture. This
                                                > > > came is handy in verifying the tuning of the antenna (I actually tuned
                                                > > > it using a resistive bridge, but the VNA feature is pretty cool).
                                                > > >
                                                > > > Thanks to all those who helped me along: Tony, Robby, Alex, and Earl.
                                                > > >
                                                > > > Regards, Sivan 4X6IZ
                                                > > >
                                                > >


                                                --
                                                Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
                                                Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
                                                Senior Staff Specialist, Cricket Coach
                                                Microsoft Windows Free Zone - Linux used for all Computing Tasks
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