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Re: SR Lite II IMD problems?

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  • warrenallgyer
    Steve I am hesitating to reply because I do not have direct experience with using the Softrocks as an IF panadapter. I have done a lot of work with the
    Message 1 of 17 , Apr 1, 2013
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      Steve

      I am hesitating to reply because I do not have direct experience with using the Softrocks as an IF panadapter. I have done a lot of work with the Softrocks itself, particularly in the area of IMD measurements. If no one else with direct experience can come in then I will do my best.

      It would be helpful if you could identify the band of origin of the SSB signals. I am assuming they are 40 meters? Do they appear as USB or LSB?

      Do you have any idea of the absolute level of the signals you are seeing from the IF? Can I assume the BPF on the Lite II is built for 40 meters?

      My experience is the Softrocks generate extremely low IMD products until the level gets high enough to overload the op amps. Typically this happens at the point the op amps are driven to attempt greater than 5V P-P output and in most receivers this requires RF input levels at +15 dBm or higher, certainly possible in the IF of a receiver.

      If you reduce the RF gain on the K3 do the spurs abruptly disappear? If they are IMD products they should do this.

      That is all I can think of for now. I hope someone with more direct experience can jump in here.

      Warren Allgyer - W8TOD

      --- In softrock40@yahoogroups.com, "steve.masticola@..." <steve.masticola@...> wrote:
      >
      > Hi, all,
      >
      > I built an SR Lite II as an IF receiver for my K3, to use as a CW skimmer. The oscillator crystal is at 8.192 MHz, the K3's IF is 8.215.
      >
      > In CW Skimmer, I'm seeing strong spurious SSB signals at 7.000 KHz (Skimmer's audio I/F set to 23 kHz.) To me, this screams third-order IMD.
      >
      > Has anyone else seen this effect? Is there anything that can be done about it?
      >
      > Thanks and 73,
      > - Steve WX2S.
      >
    • steve.masticola@verizon.net
      Hi, Warren, After some consideration I think it s more likely an aliasing problem than IMD. The bandwidth of the K3 s IF is at least 200 kHz and may actually
      Message 2 of 17 , Apr 1, 2013
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        Hi, Warren,

        After some consideration I think it's more likely an aliasing problem than IMD. The bandwidth of the K3's IF is at least 200 kHz and may actually be wider, which would require at least a 400 kHz sampling rate to avoid aliasing the upper part of the IF. Or filtering the IF with a passband between 8192 and 8288 kHz. The soundcard I'm using claims to go up to 192 kHz sampling rate, but that's still not enough.

        The SR Lite II has its bandpass filter component values set for 40 meters. Lacking any other instructions, I assumed that this was also what was needed for an 8215 IF.

        I suppose I could rebuild the bandpass filter for a more correct passband, but I'm not sure it would help, unless that filter is quite sharp.

        73,
        - WX2S




        --- In softrock40@yahoogroups.com, "warrenallgyer" <allgyer@...> wrote:
        >
        > Steve
        >
        > I am hesitating to reply because I do not have direct experience with using the Softrocks as an IF panadapter. I have done a lot of work with the Softrocks itself, particularly in the area of IMD measurements. If no one else with direct experience can come in then I will do my best.
        >
        > It would be helpful if you could identify the band of origin of the SSB signals. I am assuming they are 40 meters? Do they appear as USB or LSB?
        >
        > Do you have any idea of the absolute level of the signals you are seeing from the IF? Can I assume the BPF on the Lite II is built for 40 meters?
        >
        > My experience is the Softrocks generate extremely low IMD products until the level gets high enough to overload the op amps. Typically this happens at the point the op amps are driven to attempt greater than 5V P-P output and in most receivers this requires RF input levels at +15 dBm or higher, certainly possible in the IF of a receiver.
        >
        > If you reduce the RF gain on the K3 do the spurs abruptly disappear? If they are IMD products they should do this.
        >
        > That is all I can think of for now. I hope someone with more direct experience can jump in here.
        >
        > Warren Allgyer - W8TOD
        >
      • warrenallgyer
        Steve Out of curiosity I had a look at the K3 manual. I note the combination of the receiver pre-amp and post-amp have a total gain of 29 dB with only a
        Message 3 of 17 , Apr 1, 2013
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          Steve

          Out of curiosity I had a look at the K3 manual. I note the combination of the receiver pre-amp and post-amp have a total gain of 29 dB with only a switching mixer and the noise blanker giving attenuation.

          Most of the Softrocks I have built go into op amp overload at about -15 dBm. If you were to put 28 or so dB of gain in front of this, as the K3 apparently does, then the Softrocks would go into gross overload at -43 dBm which would be S9+30 dB. Strong 40 meter SSB signals would not be attenuated by the BPF so I think it is likely they are over-driving the Softrocks. This is assuming your are connecting it to the "IF OUT" of the K3.

          I would put a 20-30 dB pad in the IF out before connecting to the Softrocks. I am betting this will cure your problem.

          Someone else must have already solved this...... but that is my best bet.

          Warren Allgyer - W8TOD



          --- In softrock40@yahoogroups.com, "steve.masticola@..." <steve.masticola@...> wrote:
          >
          > Hi, Warren,
          >
          > After some consideration I think it's more likely an aliasing problem than IMD. The bandwidth of the K3's IF is at least 200 kHz and may actually be wider, which would require at least a 400 kHz sampling rate to avoid aliasing the upper part of the IF. Or filtering the IF with a passband between 8192 and 8288 kHz. The soundcard I'm using claims to go up to 192 kHz sampling rate, but that's still not enough.
          >
          > The SR Lite II has its bandpass filter component values set for 40 meters. Lacking any other instructions, I assumed that this was also what was needed for an 8215 IF.
          >
          > I suppose I could rebuild the bandpass filter for a more correct passband, but I'm not sure it would help, unless that filter is quite sharp.
          >
          > 73,
          > - WX2S
          >
          >
          >
          >
          > --- In softrock40@yahoogroups.com, "warrenallgyer" <allgyer@> wrote:
          > >
          > > Steve
          > >
          > > I am hesitating to reply because I do not have direct experience with using the Softrocks as an IF panadapter. I have done a lot of work with the Softrocks itself, particularly in the area of IMD measurements. If no one else with direct experience can come in then I will do my best.
          > >
          > > It would be helpful if you could identify the band of origin of the SSB signals. I am assuming they are 40 meters? Do they appear as USB or LSB?
          > >
          > > Do you have any idea of the absolute level of the signals you are seeing from the IF? Can I assume the BPF on the Lite II is built for 40 meters?
          > >
          > > My experience is the Softrocks generate extremely low IMD products until the level gets high enough to overload the op amps. Typically this happens at the point the op amps are driven to attempt greater than 5V P-P output and in most receivers this requires RF input levels at +15 dBm or higher, certainly possible in the IF of a receiver.
          > >
          > > If you reduce the RF gain on the K3 do the spurs abruptly disappear? If they are IMD products they should do this.
          > >
          > > That is all I can think of for now. I hope someone with more direct experience can jump in here.
          > >
          > > Warren Allgyer - W8TOD
          > >
          >
        • warrenallgyer
          Steve One additional thought after looking at the schematic of the Softrock Lite II: Instead of an external pad you could replace L1 with a 47 ohm resistor and
          Message 4 of 17 , Apr 1, 2013
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            Steve

            One additional thought after looking at the schematic of the Softrock Lite II:

            Instead of an external pad you could replace L1 with a 47 ohm resistor and replace C4 with a 1 ohm resister to give a quick and dirty 30+ dB of onboard attenuation.

            I would think you would not need the onboard BPF function these components provide because your K3 is providing bandpass filtering prior to this. This assumes of course that you will only use the Lite II for IF applications.

            It is only a theory but I think kind of neat and cute.

            Warren Allgyer - W8TOD

            --- In softrock40@yahoogroups.com, "warrenallgyer" <allgyer@...> wrote:
            >
            > Steve
            >
            > Out of curiosity I had a look at the K3 manual. I note the combination of the receiver pre-amp and post-amp have a total gain of 29 dB with only a switching mixer and the noise blanker giving attenuation.
            >
            > Most of the Softrocks I have built go into op amp overload at about -15 dBm. If you were to put 28 or so dB of gain in front of this, as the K3 apparently does, then the Softrocks would go into gross overload at -43 dBm which would be S9+30 dB. Strong 40 meter SSB signals would not be attenuated by the BPF so I think it is likely they are over-driving the Softrocks. This is assuming your are connecting it to the "IF OUT" of the K3.
            >
            > I would put a 20-30 dB pad in the IF out before connecting to the Softrocks. I am betting this will cure your problem.
            >
            > Someone else must have already solved this...... but that is my best bet.
            >
            > Warren Allgyer - W8TOD
            >
            >
            >
            > --- In softrock40@yahoogroups.com, "steve.masticola@" <steve.masticola@> wrote:
            > >
            > > Hi, Warren,
            > >
            > > After some consideration I think it's more likely an aliasing problem than IMD. The bandwidth of the K3's IF is at least 200 kHz and may actually be wider, which would require at least a 400 kHz sampling rate to avoid aliasing the upper part of the IF. Or filtering the IF with a passband between 8192 and 8288 kHz. The soundcard I'm using claims to go up to 192 kHz sampling rate, but that's still not enough.
            > >
            > > The SR Lite II has its bandpass filter component values set for 40 meters. Lacking any other instructions, I assumed that this was also what was needed for an 8215 IF.
            > >
            > > I suppose I could rebuild the bandpass filter for a more correct passband, but I'm not sure it would help, unless that filter is quite sharp.
            > >
            > > 73,
            > > - WX2S
            > >
            > >
            > >
            > >
            > > --- In softrock40@yahoogroups.com, "warrenallgyer" <allgyer@> wrote:
            > > >
            > > > Steve
            > > >
            > > > I am hesitating to reply because I do not have direct experience with using the Softrocks as an IF panadapter. I have done a lot of work with the Softrocks itself, particularly in the area of IMD measurements. If no one else with direct experience can come in then I will do my best.
            > > >
            > > > It would be helpful if you could identify the band of origin of the SSB signals. I am assuming they are 40 meters? Do they appear as USB or LSB?
            > > >
            > > > Do you have any idea of the absolute level of the signals you are seeing from the IF? Can I assume the BPF on the Lite II is built for 40 meters?
            > > >
            > > > My experience is the Softrocks generate extremely low IMD products until the level gets high enough to overload the op amps. Typically this happens at the point the op amps are driven to attempt greater than 5V P-P output and in most receivers this requires RF input levels at +15 dBm or higher, certainly possible in the IF of a receiver.
            > > >
            > > > If you reduce the RF gain on the K3 do the spurs abruptly disappear? If they are IMD products they should do this.
            > > >
            > > > That is all I can think of for now. I hope someone with more direct experience can jump in here.
            > > >
            > > > Warren Allgyer - W8TOD
            > > >
            > >
            >
          • Alan
            ... Subject: [softrock40] SR Lite II IMD problems? ... Steve, Here is a page to look at.
            Message 5 of 17 , Apr 1, 2013
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              ----- Original Message -----
              Subject: [softrock40] SR Lite II IMD problems?


              > Hi, all,
              >
              > I built an SR Lite II as an IF receiver for my K3, to use as a CW skimmer. The oscillator crystal is at 8.192 MHz, the K3's IF is
              > 8.215.
              >
              > In CW Skimmer, I'm seeing strong spurious SSB signals at 7.000 KHz (Skimmer's audio I/F set to 23 kHz.) To me, this screams
              > third-order IMD.
              >

              Steve,

              Here <http://www.cliftonlaboratories.com/elecraft_k3_and_panadapters.htm> is a page to look at.
              I'd forgotten it, as usual Google found it, and probably more as well.

              I know the K3 has been mentioned before, a search of the Softrock40 messages could be useful although Google usually finds those as
              well.


              73 Alan G4ZFQ
            • Alan
              And 73 Alan G4ZFQ ... From: To:
              Message 6 of 17 , Apr 2, 2013
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                And

                <http://gm0elp.blogspot.co.uk/2008/08/k3-panadapter-softrock-v62-lite.html>

                73 Alan G4ZFQ

                ----- Original Message -----
                From: <steve.masticola@...>
                To: <softrock40@yahoogroups.com>
                Sent: Sunday, March 31, 2013 12:17 PM
                Subject: [softrock40] SR Lite II IMD problems?


                > Hi, all,
                >
                > I built an SR Lite II as an IF receiver for my K3, to use as a CW skimmer. The oscillator crystal is at 8.192 MHz, the K3's IF is
                > 8.215.
                >
                > In CW Skimmer, I'm seeing strong spurious SSB signals at 7.000 KHz (Skimmer's audio I/F set to 23 kHz.) To me, this screams
                > third-order IMD.
                >
                > Has anyone else seen this effect? Is there anything that can be done about it?
                >
                > Thanks and 73,
                > - Steve WX2S.
                >
                >
                >
                >
                > ------------------------------------
                >
                > Yahoo! Groups Links
                >
                >
                >
              • Sid Boyce
                cliftonlaboratories.com has not been accessible for at least a couple of months. 73 ... Sid. ... -- Sid Boyce ... Hamradio License G3VBV, Licensed Private
                Message 7 of 17 , Apr 2, 2013
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                  cliftonlaboratories.com has not been accessible for at least a couple of months.
                  73 ... Sid.
                   
                  On 02/04/13 07:54, Alan wrote:
                   


                  ----- Original Message -----
                  Subject: [softrock40] SR Lite II IMD problems?

                  > Hi, all,
                  >
                  > I built an SR Lite II as an IF receiver for my K3, to use as a CW skimmer. The oscillator crystal is at 8.192 MHz, the K3's IF is
                  > 8.215.
                  >
                  > In CW Skimmer, I'm seeing strong spurious SSB signals at 7.000 KHz (Skimmer's audio I/F set to 23 kHz.) To me, this screams
                  > third-order IMD.
                  >

                  Steve,

                  Here <http://www.cliftonlaboratories.com/elecraft_k3_and_panadapters.htm> is a page to look at.
                  I'd forgotten it, as usual Google found it, and probably more as well.

                  I know the K3 has been mentioned before, a search of the Softrock40 messages could be useful although Google usually finds those as
                  well.

                  73 Alan G4ZFQ



                  -- 
                  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
                  
                • Alan
                  ... Subject: Re: [softrock40] SR Lite II IMD problems? ... ? I copied the URL from the page... 73 Alan G4ZFQ
                  Message 8 of 17 , Apr 2, 2013
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                    ----- Original Message -----
                    Subject: Re: [softrock40] SR Lite II IMD problems?


                    > cliftonlaboratories.com has not been accessible for at least a couple of
                    > months.
                    >> Here
                    >> <http://www.cliftonlaboratories.com/elecraft_k3_and_panadapters.htm>

                    ? I copied the URL from the page...

                    73 Alan G4ZFQ
                  • Chris Wilson
                    ... 02/04/2013 14:31 Using some UK ISP accounts the only way to contact Clifton Labs is via e-mail. They share a server with someone else, and some UK ISP
                    Message 9 of 17 , Apr 2, 2013
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                      >
                      > cliftonlaboratories.com has not been accessible for at least a couple of months.
                      > 73 ... Sid.
                      >





                      02/04/2013 14:31


                      Using some UK ISP accounts the only way to contact Clifton Labs is via
                      e-mail. They share a server with someone else, and some UK ISP block
                      that server fopr whatever reason. I cannot contact their web site via
                      my ISP Zen Internet. This may be the problem Sid? I contacted jack via
                      e-mail and he was instantly responsive to dealing via mail.


                      --
                      Best Regards,
                      Chris Wilson. 2E0ILY
                    • Jack Smith
                      The problem is that some ISPs do not recognize my Clifton Laboratories address -- there is something wrong in a certain number of DNS resolver engines
                      Message 10 of 17 , Apr 2, 2013
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                        The problem is that some ISPs do not recognize my Clifton Laboratories address -- there is something wrong in a certain number of DNS resolver engines apparently. Near as I can determine, the problem is only with European DNS engines, with UK, France and The Netherlands the primary places where the problem is seen. Never had a report of an access problem from Sweden, Australia, Norway, and many other countries where I ship kits and products.

                        I've been through this several times with XO.COM, my web hosting company and their answer is -- to quote the old Bell System answer from the trouble desk "trouble leaving here fine" -- they can do nothing as the problem is on the other end.

                        In the UK, for example, I have customers that can access my site from their home computers but not from work computers and vice versa depending on which internet service provider is used for each location.  The problem seems related to XO as another XO-hosted site is www.telepostinc.com, run by N8LP has the same issue - when my site is not accessible, neither is his and vice versa.

                        I have a few customers that can see my web site but can't  receive my E-mails - that is with orange.fr at the moment.

                        Very frustrating ... and perhaps those who cannot reach my site can ask their ISP to look into the matter.

                        In any event, I am still in business and have buffer amps, etc. ready for sale. I may be contacted either at Jack.Smith@... or Jack.Smith@....

                        Jack K8ZOA
                        www.cliftonlaboratories.com


                        On 4/2/2013 9:05 AM, Sid Boyce wrote:
                         

                        cliftonlaboratories.com has not been accessible for at least a couple of months.
                        73 ... Sid.
                         
                        On 02/04/13 07:54, Alan wrote:
                         


                        ----- Original Message -----
                        Subject: [softrock40] SR Lite II IMD problems?

                        > Hi, all,
                        >
                        > I built an SR Lite II as an IF receiver for my K3, to use as a CW skimmer. The oscillator crystal is at 8.192 MHz, the K3's IF is
                        > 8.215.
                        >
                        > In CW Skimmer, I'm seeing strong spurious SSB signals at 7.000 KHz (Skimmer's audio I/F set to 23 kHz.) To me, this screams
                        > third-order IMD.
                        >

                        Steve,

                        Here <http://www.cliftonlaboratories.com/elecraft_k3_and_panadapters.htm>is a page to look at.
                        I'd forgotten it, as usual Google found it, and probably more as well.

                        I know the K3 has been mentioned before, a search of the Softrock40 messages could be useful although Google usually finds those as
                        well.

                        73 Alan G4ZFQ



                        -- 
                        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
                        

                    • Chris Wilson
                      ... This explains why I have rarely been able to access www.telepost.inc too ;) My ISP, Zen Internet have always been very helpful, and rate highly in the UK
                      Message 11 of 17 , Apr 2, 2013
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                        >
                        > The problem is that some ISPs do not recognize my Clifton
                        > Laboratories address -- there is something wrong in a certain number
                        > of DNS resolver engines apparently. Near as I can determine, the
                        > problem is only with European DNS engines, with UK, France and The
                        > Netherlands the primary places where the problem is seen. Never had
                        > a report of an access problem from Sweden, Australia, Norway, and
                        > many other countries where I ship kits and products.

                        > I've been through this several times with XO.COM, my web hosting
                        > company and their answer is -- to quote the old Bell System answer
                        > from the trouble desk "trouble leaving here fine" -- they can do
                        > nothing as the problem is on the other end.

                        > In the UK, for example, I have customers that can access my site
                        > from their home computers but not from work computers and vice versa
                        > depending on which internet service provider is used for each
                        > location. The problem seems related to XO as another XO-hosted site
                        > is www.telepostinc.com, run by N8LP has the same issue - when my
                        > site is not accessible, neither is his and vice versa.

                        > I have a few customers that can see my web site but can't receive
                        > my E-mails - that is with orange.fr at the moment.

                        > Very frustrating ... and perhaps those who cannot reach my site can
                        > ask their ISP to look into the matter.

                        > In any event, I am still in business and have buffer amps, etc.
                        > ready for sale. I may be contacted either at
                        > Jack.Smith@... or Jack.Smith@....

                        > Jack K8ZOA
                        > www.cliftonlaboratories.com


                        This explains why I have rarely been able to access www.telepost.inc
                        too ;) My ISP, Zen Internet have always been very helpful, and rate
                        highly in the UK ratings, often at number one. They say, in effect,
                        "Not our fault, must be the other end"...... Must be a PITA for you
                        Jack, one would think by now ISP's could resolve such matters
                        painlessly.





                        02/04/2013 16:42



                        --
                        Best Regards,
                        Chris Wilson. 2E0ILY
                      • Alan
                        ... Is there no way round this? Use Google DNS for example? 73 Alan G4ZFQ
                        Message 12 of 17 , Apr 2, 2013
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                          ----- Original Message -----

                          > This explains why I have rarely been able to access www.telepost.inc
                          > too ;) My ISP, Zen Internet have always been very helpful, and rate
                          > highly in the UK ratings, often at number one. They say, in effect,
                          > "Not our fault, must be the other end"......

                          Is there no way round this?
                          Use Google DNS for example?

                          73 Alan G4ZFQ
                        • Chris Wilson
                          ... I just tried loading two different fixed DNS server addresses, rather than have find automatically set. Still neither address will resolve. I have just
                          Message 13 of 17 , Apr 2, 2013
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                            >

                            > ----- Original Message -----

                            >> This explains why I have rarely been able to access www.telepost.inc
                            >> too My ISP, Zen Internet have always been very helpful, and rate
                            >> highly in the UK ratings, often at number one. They say, in effect,
                            >> "Not our fault, must be the other end"......

                            > Is there no way round this?
                            > Use Google DNS for example?

                            > 73 Alan G4ZFQ

                            I just tried loading two different fixed DNS server addresses, rather
                            than have "find automatically" set. Still neither address will
                            resolve. I have just seen that using a DNS lookup site that both
                            telepost and cliftonlaboratories sites are blacklisted on spamhaus.zen
                            maybe that's the issue? Well outside of my comfort zone now
                            though.... Engines, yes, IT stuff, no :)


                            02/04/2013 16:56



                            --
                            Best Regards,
                            Chris Wilson. 2E0ILY
                          • warrenallgyer
                            I can access the Clifton Labs site fine but it really doesn t address Steve s question. The interface described focuses on weak signal performance rather than
                            Message 14 of 17 , Apr 2, 2013
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                              I can access the Clifton Labs site fine but it really doesn't address Steve's question. The interface described focuses on weak signal performance rather than overload and even some of those measurements don't make sense to me. For example, looking at the Softrocks trace connected directly through the IF port versus connecting with a 10 dB amplifier. Yes the signal level improves by 10 dB but the noise floor stays exactly the same. This indicates that the true signal performance was being limited in this case by a noise floor downstream of the Softrocks, likely the audio card. Otherwise the noise floor would rise with 10 dB of added gain.

                              In thinking about it, and with the numbers from the Clifton Labs site I am still betting on overload from 40 meter SSB signals causing images to appear in the CW band. This happens to me in Beijing with high power 40 meter broadcasters that put -10 to 0 dBm signals and create IMD products every 10 KHz for several hundred KHz on either side.

                              We still need to hear from Steve what effect the preamp and postamp on the K3 have on the images.
                              --- In softrock40@yahoogroups.com, Chris Wilson <chris@...> wrote:
                              >
                              >
                              >
                              > >
                              >
                              > > ----- Original Message -----
                              >
                              > >> This explains why I have rarely been able to access www.telepost.inc
                              > >> too My ISP, Zen Internet have always been very helpful, and rate
                              > >> highly in the UK ratings, often at number one. They say, in effect,
                              > >> "Not our fault, must be the other end"......
                              >
                              > > Is there no way round this?
                              > > Use Google DNS for example?
                              >
                              > > 73 Alan G4ZFQ
                              >
                              > I just tried loading two different fixed DNS server addresses, rather
                              > than have "find automatically" set. Still neither address will
                              > resolve. I have just seen that using a DNS lookup site that both
                              > telepost and cliftonlaboratories sites are blacklisted on spamhaus.zen
                              > maybe that's the issue? Well outside of my comfort zone now
                              > though.... Engines, yes, IT stuff, no :)
                              >
                              >
                              > 02/04/2013 16:56
                              >
                              >
                              >
                              > --
                              > Best Regards,
                              > Chris Wilson. 2E0ILY
                              >
                            • Sid Boyce
                              ... Thanks Chris, That s undoubtedly the problem. 73 ... Sid. -- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus IBM/Amdahl Mainframes
                              Message 15 of 17 , Apr 2, 2013
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                                On 02/04/13 14:33, Chris Wilson wrote:
                                 



                                >
                                > cliftonlaboratories.com has not been accessible for at least a couple of months.
                                > 73 ... Sid.
                                >

                                02/04/2013 14:31

                                Using some UK ISP accounts the only way to contact Clifton Labs is via
                                e-mail. They share a server with someone else, and some UK ISP block
                                that server fopr whatever reason. I cannot contact their web site via
                                my ISP Zen Internet. This may be the problem Sid? I contacted jack via
                                e-mail and he was instantly responsive to dealing via mail.

                                --
                                Best Regards,
                                Chris Wilson. 2E0ILY

                                Thanks Chris,
                                That's undoubtedly the problem.
                                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
                                
                              • Lawrence Galea
                                I don t have any problems accessing from my end. http://www.cliftonlaboratories.com/ Regards, Lawrence ________________________________ Da: Chris Wilson
                                Message 16 of 17 , Apr 4, 2013
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                                  I don't have any problems accessing from my end.
                                  http://www.cliftonlaboratories.com/
                                  Regards,
                                  Lawrence


                                  Da: Chris Wilson <chris@...>
                                  A: softrock40@yahoogroups.com
                                  Inviato: Martedì 2 Aprile 2013 17:59
                                  Oggetto: Re: [softrock40] SR Lite II IMD problems?

                                   


                                  >

                                  > ----- Original Message -----

                                  >> This explains why I have rarely been able to access www.telepost.inc
                                  >> too My ISP, Zen Internet have always been very helpful, and rate
                                  >> highly in the UK ratings, often at number one. They say, in effect,
                                  >> "Not our fault, must be the other end"......

                                  > Is there no way round this?
                                  > Use Google DNS for example?

                                  > 73 Alan G4ZFQ

                                  I just tried loading two different fixed DNS server addresses, rather
                                  than have "find automatically" set. Still neither address will
                                  resolve. I have just seen that using a DNS lookup site that both
                                  telepost and cliftonlaboratories sites are blacklisted on spamhaus.zen
                                  maybe that's the issue? Well outside of my comfort zone now
                                  though.... Engines, yes, IT stuff, no :)

                                  02/04/2013 16:56

                                  --
                                  Best Regards,
                                  Chris Wilson. 2E0ILY



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