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Re: [softrock40] RXTX 6.1, bands and SSB

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  • Bill Dumke
    Doc, Good question. I don t know. They would have to be fundamental mode at 4 times the crystal frequency I gave for Tony s oscillator circuit. Also I think it
    Message 1 of 14 , Jan 1, 2007
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      Doc,

      Good question.  I don't know. 

      They would have to be fundamental mode at 4 times the crystal frequency I gave for Tony's oscillator circuit.  Also I think it would be good to have a series trimmer capacitor with possibly a fixed capacitor in parallel with the trimmer to trim the frequency for best accuracy for each crystal.   And then order the crystals for 32 pf load capacitance or something like that.

      I believe Tony has been getting his crystals from DigiKey and other vendors where the crystals are manufactured in high volume for specific tasks like computer clock oscillators, for example.  So there isn't much of a choice in frequencies, although they are very cheap.

      I don't think this would be very practical for each band.  And I don't recommend using the dual band design anyway.  The front end filter in that radio's receiver is wide open to a lot of things.  I don't believe in chasing signals that are not there.

      From an earlier post: 

      "I just did a quick check on the RXTX V6.1 prototype and I needed to
      inject an S8 Signal (30uV) on 3539 Khz to measure a 10dB Sinad
      response when tuned to 7067 Khz. So there is a harmonic response
      however I have not found too much of a problem listening in the current
      band condx.

      Jan G0BBL"

      Let me give International Crystal a phone call Tuesday and find out how much it would cost for a set of 4 crystals for full coverage operation at 40 meters.

      (Others are using DDS-60's for digital frequency control, but these have a lot of spurs.  I wouldn't trust them in transmit.)

      Bill WA9PWR   

      kd4e wrote:

      What would it cost to get a full set of those and a
      similar set for 80M?

      Would it be necessary to socket them or might they
      be outboarded and switched, please?

      I am not familiar enough with the dynamics of the
      circuit design to speculate.

      > Until a kit of crystals is provided to cover all of 40 meters, questions
      > like yours will always be asked.
      >
      > "A set of 7.040, 7.120, 7.200, and 7.280 MHz center frequencies would
      > cover the entire 40 meter band with some overlap with a 96 kHz sampling
      > sound card. Also setting Rocky to 0 center frequency it could be used
      > to accurately determine operating frequencies. Just need to add to or
      > subtract from the chosen center frequency.
      >
      > Bill WA9PWR"

      --

      Thanks! & 73, doc, KD4E
      Have a joy-filled New Year!
      ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~
      Projects: http://ham-macguyve r.bibleseven. com
      Personal: http://bibleseven. com
      ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~

    • Bill Dumke
      Tony, Thanks for the reply. I am using a Delta 44 sound card so I should be fine. (Another good reason for a Delta 44) Bill WA9PWR Tony Parks wrote: Hi Bill,
      Message 2 of 14 , Jan 1, 2007
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        Tony,

        Thanks for the reply.

        I am using a Delta 44 sound card so I should be fine. (Another good reason for a Delta 44)

        Bill WA9PWR

        Tony Parks wrote:

        Hi Bill,
         
        The RX coverage with a SoftRock receiver or the RX function in the RXTX can be +/- 48 kHz from the center frequency if the soundcard can sample at 96 kHz.  The line-out stereo signal from soundcards is more band limited and in some soundcards has high noise above 20 kHz.  Thus the RXTX is limited to about +/-20 kHz TX tuning range from the center frequency.  Also there will be a few kHz lost round the center frequency.  I feel even with the more limited TX tuning range that the RXTX can still be a useful little rig and several who have been using the RXTX on the air have made a number of QSOs with various modes.
         
        Thanks for your interest in the project.
         
        73,
        Tony KB9YIG
         
        ----- Original Message -----
        Sent: Monday, January 01, 2007 6:04 PM
        Subject: Re: [softrock40] Re: RXTX 6.1, bands and SSB

        Tony,

        Is this true?  Is the only purpose of a SoftRock TxRx to be on receive a panadapter? 

        I was assuming that it could be used  up to where the windowing gave out, on both Tx and Rx.  (For 96kHz sampling this would be about +/- 43 kHz.)

        Bill WA9PWR



        jabauzit wrote:

        Bill, WA9PWR wrote

        > A set of 7.040, 7.120, 7.200, and 7.280 MHz center frequencies would
        > cover the entire 40 meter band with some overlap with a 96 kHz
        > sampling sound card.

        This is fine for receive, but for transmit I remember seeing something
        like +/-20kHz to comply with the FCC requirements regarding the
        quality of the signal.

        > Also setting Rocky to 0 center frequency it could be used to
        > accurately determine operating frequencies. Just need to add to or
        > subtract from the chosen center frequency.

        Why not just enter the center frequency and use the multi band feature
        of Rocky, which you should do as you can calibrate amplitude/phase
        correction for each band.

        Jean-Claude, PJ2BVU

      • kd4e
        The best new prices I see are the Delta 44 at $149. and the Delta 66 at $189. Is the Delta 66 worth the $40. difference and is it a better long-term investment
        Message 3 of 14 , Jan 1, 2007
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          The best new prices I see are the Delta 44 at $149.
          and the Delta 66 at $189.

          Is the Delta 66 worth the $40. difference and is it
          a better long-term investment tracking with the
          future features of SoftRock hardware and software?

          > The RX coverage with a SoftRock receiver or the RX function in the RXTX
          > can be +/- 48 kHz from the center frequency if the soundcard can sample
          > at 96 kHz. The line-out stereo signal from soundcards is more band
          > limited and in some soundcards has high noise above 20 kHz. Thus the
          > RXTX is limited to about +/-20 kHz TX tuning range from the center
          > frequency. Also there will be a few kHz lost round the center
          > frequency. I feel even with the more limited TX tuning range that the
          > RXTX can still be a useful little rig and several who have been using
          > the RXTX on the air have made a number of QSOs with various modes.
          >
          > Thanks for your interest in the project.
          > 73, Tony KB9YIG


          --

          Thanks! & 73, doc, KD4E
          Have a joy-filled New Year!
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Projects: http://ham-macguyver.bibleseven.com
          Personal: http://bibleseven.com
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        • Bill Dumke
          Doc, My guess is the next generation of these SDR receivers will use a USB device instead of a sound card. But for right now, the Delta 44 is the best way to
          Message 4 of 14 , Jan 1, 2007
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            Doc,

            My guess is the next generation of these SDR receivers will use a USB device instead of a sound card.   But for right now, the Delta 44 is the best way to go.  The Delta 66 doesn't offer anything more that would work with a SoftRock.   You still need analog audio.  It's just that in some places it is hard to find the Delta 44 cards now.

            Bill WB5TCO 

            kd4e wrote:

            The best new prices I see are the Delta 44 at $149.
            and the Delta 66 at $189.

            Is the Delta 66 worth the $40. difference and is it
            a better long-term investment tracking with the
            future features of SoftRock hardware and software?

            > The RX coverage with a SoftRock receiver or the RX function in the RXTX
            > can be +/- 48 kHz from the center frequency if the soundcard can sample
            > at 96 kHz. The line-out stereo signal from soundcards is more band
            > limited and in some soundcards has high noise above 20 kHz. Thus the
            > RXTX is limited to about +/-20 kHz TX tuning range from the center
            > frequency. Also there will be a few kHz lost round the center
            > frequency. I feel even with the more limited TX tuning range that the
            > RXTX can still be a useful little rig and several who have been using
            > the RXTX on the air have made a number of QSOs with various modes.
            >
            > Thanks for your interest in the project.
            > 73, Tony KB9YIG

            --

            Thanks! & 73, doc, KD4E
            Have a joy-filled New Year!
            ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~
            Projects: http://ham-macguyve r.bibleseven. com
            Personal: http://bibleseven. com
            ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~

          • kd4e
            Good info! Will focus on the Delta 44. I have found the Delta 44 for $139. on sale with free shipping and $129. refurbished. Now what can I sell to find that
            Message 5 of 14 , Jan 1, 2007
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              Good info! Will focus on the Delta 44.

              I have found the Delta 44 for $139. on sale with
              free shipping and $129. refurbished.

              Now what can I sell to find that new money? :-)

              > My guess is the next generation of these SDR receivers will use a USB
              > device instead of a sound card. But for right now, the Delta 44 is the
              > best way to go. The Delta 66 doesn't offer anything more that would
              > work with a SoftRock. You still need analog audio. It's just that in
              > some places it is hard to find the Delta 44 cards now.
              > Bill WB5TCO

              --

              Thanks! & 73, doc, KD4E
              Have a joy-filled New Year!
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              Projects: http://ham-macguyver.bibleseven.com
              Personal: http://bibleseven.com
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            • Bill Dumke
              Doc, Got a quote back from International Crystal: -----Original Message----- From: Mark Handley [ mailto:markh@icmfg.com ] Sent: Wednesday, January 03, 2007
              Message 6 of 14 , Jan 5, 2007
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                Doc,

                Got a quote back from International Crystal: 

                "-----Original Message-----
                From: Mark Handley [mailto:markh@...] 
                Sent: Wednesday, January 03, 2007 10:11 AM
                To: Bill E Dumke
                Subject: FW: Crystals for Oscillator
                
                
                Mr. Dumke,
                Darell asked me to answer your questions. For the four crystal
                frequencies listed below, I would recommend our catalog number "49HL32-
                Your freq" This should work just fine for you provided that the trimmer
                shunt cap combination that you use has a total capacitance in the 50 to
                60pf range.
                The load capacitance of the catalog number above is 32pf. Pricing is
                $15.95 per crystal plus shipping. Also as to the ground wire, the answer
                is yes. If I can be of further assistance, please let me know.
                
                Regards,
                Mark Handley
                ICM"
                These would be wire lead HC49U crystals.

                It looks like they charge another $8.50 for shipping UPS as well.  (Shipping sounds kind of high to me.)  So the total would be $72.30.
                 
                I think it would be a simple way to get full band coverage without the spurs from a DDS.  The crystals could be switched mechanically.   There have been several examples in the files and photos sections of  switched crystal SoftRocks, but never for complete single band coverage.   A Grayhill 4 or 5 position switch has been used successfully before.   A series trimmer cap either by itself or possibly with a shunt fixed cap, the total capacitance centered on 32 pF should be used on each crystal to calibrate the frequencies as close as possible.  This would insure accuracy when switching from one range to the other in the 40 meter band.   Again this would assume a 96 kHz sampling rate sound card like a Delta 44.

                I'll have to see how much I have left this month after paying property taxes and my stack of bills.

                Bill WA9PWR


                Bill Dumke wrote:

                Doc,

                Good question.  I don't know. 

                They would have to be fundamental mode at 4 times the crystal frequency I gave for Tony's oscillator circuit.  Also I think it would be good to have a series trimmer capacitor with possibly a fixed capacitor in parallel with the trimmer to trim the frequency for best accuracy for each crystal.   And then order the crystals for 32 pf load capacitance or something like that.

                I believe Tony has been getting his crystals from DigiKey and other vendors where the crystals are manufactured in high volume for specific tasks like computer clock oscillators, for example.  So there isn't much of a choice in frequencies, although they are very cheap.

                I don't think this would be very practical for each band.  And I don't recommend using the dual band design anyway.  The front end filter in that radio's receiver is wide open to a lot of things.  I don't believe in chasing signals that are not there.

                >From an earlier post: 

                "I just did a quick check on the RXTX V6.1 prototype and I needed to
                inject an S8 Signal (30uV) on 3539 Khz to measure a 10dB Sinad
                response when tuned to 7067 Khz. So there is a harmonic response
                however I have not found too much of a problem listening in the current
                band condx.

                Jan G0BBL"

                Let me give International Crystal a phone call Tuesday and find out how much it would cost for a set of 4 crystals for full coverage operation at 40 meters.

                (Others are using DDS-60's for digital frequency control, but these have a lot of spurs.  I wouldn't trust them in transmit.)

                Bill WA9PWR   

                kd4e wrote:

                What would it cost to get a full set of those and a
                similar set for 80M?

                Would it be necessary to socket them or might they
                be outboarded and switched, please?

                I am not familiar enough with the dynamics of the
                circuit design to speculate.

                > Until a kit of crystals is provided to cover all of 40 meters, questions
                > like yours will always be asked.
                >
                > "A set of 7.040, 7.120, 7.200, and 7.280 MHz center frequencies would
                > cover the entire 40 meter band with some overlap with a 96 kHz sampling
                > sound card. Also setting Rocky to 0 center frequency it could be used
                > to accurately determine operating frequencies. Just need to add to or
                > subtract from the chosen center frequency.
                >
                > Bill WA9PWR"

                --

                Thanks! & 73, doc, KD4E
                Have a joy-filled New Year!
                ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~
                Projects: http://ham-macguyve r.bibleseven. com
                Personal: http://bibleseven. com
                ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~

              • Bill Dumke
                Doc, Got a quote back from International Crystal: -----Original Message----- From: Mark Handley [ mailto:markh@icmfg.com ] Sent: Wednesday, January 03, 2007
                Message 7 of 14 , Jan 7, 2007
                • 0 Attachment
                  Doc,

                  Got a quote back from International Crystal: 

                  "-----Original Message-----
                  From: Mark Handley [mailto:markh@...] 
                  Sent: Wednesday, January 03, 2007 10:11 AM
                  To: Bill E Dumke
                  Subject: FW: Crystals for Oscillator
                  
                  
                  Mr. Dumke,
                  Darell asked me to answer your questions. For the four crystal
                  frequencies listed below, I would recommend our catalog number "49HL32-
                  Your freq" This should work just fine for you provided that the trimmer
                  shunt cap combination that you use has a total capacitance in the 50 to
                  60pf range.
                  The load capacitance of the catalog number above is 32pf. Pricing is
                  $15.95 per crystal plus shipping. Also as to the ground wire, the answer
                  is yes. If I can be of further assistance, please let me know.
                  
                  Regards,
                  Mark Handley
                  ICM"
                  These would be wire lead HC49U crystals.

                  It looks like they charge another $8.50 for shipping UPS as well.  (Shipping sounds kind of high to me.)  So the total would be $72.30.
                   
                  I think it would be a simple way to get full band coverage without the spurs from a DDS.  The crystals could be switched mechanically.   There have been several examples in the files and photos sections of  switched crystal SoftRocks, but never for complete single band coverage.   A Grayhill 4 or 5 position switch has been used successfully before.   A series trimmer cap either by itself or possibly with a shunt fixed cap, the total capacitance centered on 32 pF should be used on each crystal to calibrate the frequencies as close as possible.  This would insure accuracy when switching from one range to the other in the 40 meter band.   Again this would assume a 96 kHz sampling rate sound card like a Delta 44.

                  I'll have to see how much I have left this month after paying property taxes and my stack of bills.

                  Bill WA9PWR


                  Bill Dumke wrote:

                  Doc,

                  Good question.  I don't know. 

                  They would have to be fundamental mode at 4 times the crystal frequency I gave for Tony's oscillator circuit.  Also I think it would be good to have a series trimmer capacitor with possibly a fixed capacitor in parallel with the trimmer to trim the frequency for best accuracy for each crystal.   And then order the crystals for 32 pf load capacitance or something like that.

                  I believe Tony has been getting his crystals from DigiKey and other vendors where the crystals are manufactured in high volume for specific tasks like computer clock oscillators, for example.  So there isn't much of a choice in frequencies, although they are very cheap.

                  I don't think this would be very practical for each band.  And I don't recommend using the dual band design anyway.  The front end filter in that radio's receiver is wide open to a lot of things.  I don't believe in chasing signals that are not there.

                  >From an earlier post: 

                  "I just did a quick check on the RXTX V6.1 prototype and I needed to
                  inject an S8 Signal (30uV) on 3539 Khz to measure a 10dB Sinad
                  response when tuned to 7067 Khz. So there is a harmonic response
                  however I have not found too much of a problem listening in the current
                  band condx.

                  Jan G0BBL"

                  Let me give International Crystal a phone call Tuesday and find out how much it would cost for a set of 4 crystals for full coverage operation at 40 meters.

                  (Others are using DDS-60's for digital frequency control, but these have a lot of spurs.  I wouldn't trust them in transmit.)

                  Bill WA9PWR   

                  kd4e wrote:

                  What would it cost to get a full set of those and a
                  similar set for 80M?

                  Would it be necessary to socket them or might they
                  be outboarded and switched, please?

                  I am not familiar enough with the dynamics of the
                  circuit design to speculate.

                  > Until a kit of crystals is provided to cover all of 40 meters, questions
                  > like yours will always be asked.
                  >
                  > "A set of 7.040, 7.120, 7.200, and 7.280 MHz center frequencies would
                  > cover the entire 40 meter band with some overlap with a 96 kHz sampling
                  > sound card. Also setting Rocky to 0 center frequency it could be used
                  > to accurately determine operating frequencies. Just need to add to or
                  > subtract from the chosen center frequency.
                  >
                  > Bill WA9PWR"

                  --

                  Thanks! & 73, doc, KD4E
                  Have a joy-filled New Year!
                  ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~
                  Projects: http://ham-macguyve r.bibleseven. com
                  Personal: http://bibleseven. com
                  ~~~~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~

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