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FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

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  • Tommy Kane
    Is there a problem with the system, replies not showing up. Tommy MM0KNE From: Tommy Kane [mailto:coolcamper55@tiscali.co.uk] Sent: 02 April 2014 14:28 To:
    Message 1 of 8 , Apr 3, 2014
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      Is there a problem with the system, replies not showing up.

       

      Tommy

      MM0KNE

       

      From: Tommy Kane [mailto:coolcamper55@...]
      Sent: 02 April 2014 14:28
      To: 'Raspberry_Pi_4-Ham_RADIO@yahoogroups.com'
      Subject: RE: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

       

      Update to status.

       

      Checked out the connectivity to U4) all fine and 3.3v on the appropriate pin. Unable to hear a tone using earphones, loaded Visual Analyser and spent quite a time trying to understand that. Help pages were rather vague, found a forum that talked about it so read most of the pertinent info and tried again.

      When attaching a probe to pin3 in the 4 pin header  area or to pin 6 on the IC, I notice a change in the display of VA. Unfortunately it dies after 3 seconds so difficult to evaluate. Not sure if its the IC dying or something in VA. I am finding VA setup is as user friendly as a cornered rat.

      I also need to understand how I can change the OP of the IC incase its too low.

      Any experts on VA who can help with the 3 second issue would be appreciated.

       

      Tommy

      MM0KNE

       

      From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of John Hansen
      Sent: 31 March 2014 21:53
      To: raspberry_pi_4-ham_radio
      Subject: Re: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

       

       

      You should see the yellow LED flash every now and then; that is normal.  The fact that the yellow LED doesn't come on solidly when packet data is received means that for some reason the audio is not getting to the modem chip (or the modem chip is not working or the connection between the modem chip and the PIC is not there).  I would use an earphone (or even better an oscilloscope if you've got one) to look for audio on pin 6 of U4.  If you don't hear anything there, it will simplify your debugging job because it probably means either the cabling of the radio to the TNC isn't right or the level is too low. 

      John Hansen
      Coastal ChipWorks

       

      On Mon, Mar 31, 2014 at 3:31 PM, <coolcamper55@...> wrote:

       

      Folks, Bit of help required here.

      I have recently received the TNC-Pi and built it but having a bit of a struggle to get it working.

      I installed all the Wheezy files and AX25 as per the instructions from K4gbb' site (that is when I could get in, seems to have been dropping lately), I also downloaded xastir and set it up killing the kissattach prior to setting it up.

      In the ax25 set up it offers the Calibrate function where it sends a string of 1's and 0's until the buffer is empty.

      I monitor that on another HT but all I get is white noise, no distinct tone.

      I also attached a speaker to the TNC-Pi board and again no distinct tone just the white noise.

      When I first sitch the Pi on, both red and yellow lights come on then red goes followed by yellow. As far as I know this is standard. Every now and then the DCD or Yellow light will blink but when there is a full blown APRS transmission there is no visible signs on the TNC-Pi that it has heard anything. I am using a Quasheng TG-UV2 HT and the cable specs are as per those in the Byonics site but not really sure if its the TNC-Pi or the TNC -HT cables.

      Any assistance in helping me track down or narrow down the field of enquiry would be much appreciated.

       

      Tommy

      MM0KNE

       

    • tommykane52
      Further update, have buzzed out all connections from Modem IC and PIC IC plus most of the board and all shown fine. I tried again with the Visual ANalyser
      Message 2 of 8 , Apr 4, 2014
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        Further update, have buzzed out all connections from Modem IC and PIC IC  plus most of the board and all shown fine. I tried again with the Visual ANalyser software and have come to the conclusion that all I am getting from the probe points is mains hum.

        I get a very low throbbing but definitely not a clear audible tone.


        Seriously running out of ideas, maybe time to dust off the tiny Track4

        Tommy

        MM0KNE

      • John Wiseman
        Tommy, If you like I ll take a look at it. I m going to be away for most of April but could check it out when I get back. 73, John G8BPQ _____ From:
        Message 3 of 8 , Apr 4, 2014
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          Tommy,

           

          If you like I’ll take a look at it. I’m going to be away for most of April but could check it out when I get back.

           

          73,

          John G8BPQ

           


          From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of coolcamper55@...
          Sent: 04 April 2014 08:42
          To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
          Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

           

           

          Further update, have buzzed out all connections from Modem IC and PIC IC  plus most of the board and all shown fine. I tried again with the Visual ANalyser software and have come to the conclusion that all I am getting from the probe points is mains hum.

          I get a very low throbbing but definitely not a clear audible tone.

           

          Seriously running out of ideas, maybe time to dust off the tiny Track4

          Tommy

          MM0KNE

        • Ian
          Tommy, I had a dead TNC-PI with no tx audio. My fault was a bad solder joint on the 26 pin connector. Just a stab in the dark !!! 73, Ian.. ... On Fri,
          Message 4 of 8 , Apr 4, 2014
          • 0 Attachment
            Tommy,

            I had a " dead " TNC-PI with no tx audio. My fault was a bad solder joint on the 26 pin connector.

            Just a stab in the dark !!!

            73,
            Ian..
            --------------------------------------------
            On Fri, 4/4/14, coolcamper55@... <coolcamper55@...> wrote:

            Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi
            To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
            Date: Friday, 4 April, 2014, 8:41


             









            Further update, have buzzed out all
            connections from Modem IC and PIC IC  plus most of the
            board and all shown fine. I tried again with the Visual
            ANalyser software and have come to the conclusion that all I
            am getting from the probe points is mains hum.I get a
            very low throbbing but definitely not a clear audible
            tone.
            Seriously running out of
            ideas, maybe time to dust off the tiny
            Track4TommyMM0KNE










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          • Tommy Kane
            Well any stab in dark is worth it, however after refloating the solder on the 26pins no change. I have found that if I probe the TX audio point, it dies after
            Message 5 of 8 , Apr 4, 2014
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              Well any stab in dark is worth it, however after refloating the solder on the 26pins no change. I have found that if I probe the TX audio point, it dies after 2-3 seconds (same response on pin6 U4), maybe a capacitor or something breaking down but I am beat for the moment.

               

               

              Thanks for the help so far.

               

              Tommy

              MM0KNE

               

              From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of Ian
              Sent: 04 April 2014 12:05
              To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
              Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

               

               

              Tommy,

              I had a " dead " TNC-PI with no tx audio. My fault was a bad solder joint on the 26 pin connector.

              Just a stab in the dark !!!

              73,
              Ian..
              --------------------------------------------

              On Fri, 4/4/14, coolcamper55@... <coolcamper55@...> wrote:

              Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi
              To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
              Date: Friday, 4 April, 2014, 8:41


               









              Further update, have buzzed out all
              connections from Modem IC and PIC IC  plus most of the
              board and all shown fine. I tried again with the Visual
              ANalyser software and have come to the conclusion that all I
              am getting from the probe points is mains hum.I get a
              very low throbbing but definitely not a clear audible
              tone.
              Seriously running out of
              ideas, maybe time to dust off the tiny
              Track4TommyMM0KNE










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            • Tommy Kane
              John, Very kind offer, what I think I will do is persevere until you have more time and if it s still a problem, let you have a go at it. Again much
              Message 6 of 8 , Apr 4, 2014
              • 0 Attachment

                John, Very kind offer, what I think I will do is persevere until you have more time and if it's still a problem, let you have a go at it. Again much appreciated

                 

                Tommy

                MM0KNE

                From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of John Wiseman
                Sent: 04 April 2014 09:25
                To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
                Subject: RE: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

                 

                 

                Tommy,

                 

                If you like I’ll take a look at it. I’m going to be away for most of April but could check it out when I get back.

                 

                73,

                John G8BPQ

                 


                From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of coolcamper55@...
                Sent: 04 April 2014 08:42
                To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
                Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

                 

                 

                Further update, have buzzed out all connections from Modem IC and PIC IC  plus most of the board and all shown fine. I tried again with the Visual ANalyser software and have come to the conclusion that all I am getting from the probe points is mains hum.

                I get a very low throbbing but definitely not a clear audible tone.

                 

                Seriously running out of ideas, maybe time to dust off the tiny Track4

                Tommy

                MM0KNE

              • John Hansen
                I m not clear as to whether you are working on receive audio or transmit audio here. If it s receive audio, I suggested looking on pin 6 of the MCP6023
                Message 7 of 8 , Apr 4, 2014
                • 0 Attachment
                  I'm not clear as to whether you are working on receive audio or transmit audio here.  If it's receive audio, I suggested looking on pin 6 of the MCP6023 because after it runs through resistor R3, I find it is somewhat difficult to detect.  On receive, you should see audio at pin 6 (if you don't, take a close look at the connecting cable from your radio and the connections in the area of U4 and focus on this until you find where the audio gets lost).  If you do find audio there, take a look at the pattern of data coming out of pin 13 of the MX614.  You should always see a data pattern there, but when packets are being received, you should see a noticeable change in this pattern.

                  If you working on transmit audio, the first thing to check is whether bits are actually getting to the PIC from the Pi.  Look for data pulses on pin 8 of the PIC when you are attempting to send data from the Pi.  If you don't see anything there, the problem is either with the Pi configuration or with the data path from the Pi to the TNC (make sure the jumpers are both on!).  If you do see data there, then check the Red LED to make sure it lights up when transmitting.  If you see data on pin 8, but don't get a a red LED, then contact me and I'll send you a replacement PIC (though there is possibility of a bad modem chip as well... this is unlikely if receive is working).

                  John W2FS


                  On Fri, Apr 4, 2014 at 4:25 AM, John Wiseman <john.wiseman@...> wrote:
                   

                  Tommy,

                   

                  If you like I’ll take a look at it. I’m going to be away for most of April but could check it out when I get back.

                   

                  73,

                  John G8BPQ

                   


                  From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of coolcamper55@...
                  Sent: 04 April 2014 08:42
                  To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com


                  Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

                   

                   

                  Further update, have buzzed out all connections from Modem IC and PIC IC  plus most of the board and all shown fine. I tried again with the Visual ANalyser software and have come to the conclusion that all I am getting from the probe points is mains hum.

                  I get a very low throbbing but definitely not a clear audible tone.

                   

                  Seriously running out of ideas, maybe time to dust off the tiny Track4

                  Tommy

                  MM0KNE


                • Tommy Kane
                  Today I double checked and buzzed out the PCB all connections are showing OK. I had previously checked out the transmit by starting xastir and when transmit
                  Message 8 of 8 , Apr 5, 2014
                  • 0 Attachment

                    Today I double checked and buzzed out the PCB all connections are showing OK.

                    I had previously checked out the transmit by starting xastir and when "transmit now" was actioned the radio did indeed transmit however it did not sound like aprs to me but first I started on the RX.  

                    The radio has the ability to receive local FM broadcast stations so I tuned into one of them. APRS traffic in the area is rather sparse and the fm station gave me the ability to obtain a steady input and to confirm that the receive cable was correct.

                    With the PI / TNC powered off, I was able to detect the audio on most of the points that the circuit diagram suggested.

                    This included pins on the Op amp, PIC various resistors and capacitors eg C8.

                    I also got clear audio going into R3 but as suggested not able to pick it up on the downside.

                    On the Modem chip the following was found

                    Clear audio on Pin 6

                    No audio on Pin 5

                    Audio heard on Pin 13 but badly distorted.

                    I powered up the Pi and started to look at the TX side.

                    Pulse detected on Pin8 of PIC

                    I then opened Xastir and started the TNC, it came up and I pressed the Transmit Now option. The Radio did transmit and it was heard by another radio. Checked APRS.fi and found that the nearest digi had picked it up and had passed it onto APRS.fi.

                     

                    As I mentioned earlier, APRS is a tad sparse around here and the nearest digi beacons every 30 minutes  and I have managed to receive and decode the output 3 times.

                    It seems to be working although I am not sure about the distortion across the modem chip, and I still have not heard the 450Hz tone that is supposed to be there all the time.

                     

                     

                    As to the fix, might have been a dry joint somewhere, I had to re-sweat a couple of contacts to get a meter reading. I will leave it running for 24 Hrs and see what it looks like.

                    This TNC plus the Pi are destined for remote deployment in SAR work so need to be sure, we do have backup systems but this is ideal in terms of storage and power options.

                    You can probably see the APRS.fi data for yourself.

                    The additional bonus of all this effort is that I am getting a lot of use with the Oscilloscope software.

                     

                    Many thanks for all the advice and offers of assistance, it really is appreciated.

                     

                    Tommy

                    MM0KNE

                     

                     

                    From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of John Hansen
                    Sent: 04 April 2014 15:11
                    To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
                    Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

                     

                     

                    I'm not clear as to whether you are working on receive audio or transmit audio here.  If it's receive audio, I suggested looking on pin 6 of the MCP6023 because after it runs through resistor R3, I find it is somewhat difficult to detect.  On receive, you should see audio at pin 6 (if you don't, take a close look at the connecting cable from your radio and the connections in the area of U4 and focus on this until you find where the audio gets lost).  If you do find audio there, take a look at the pattern of data coming out of pin 13 of the MX614.  You should always see a data pattern there, but when packets are being received, you should see a noticeable change in this pattern.

                    If you working on transmit audio, the first thing to check is whether bits are actually getting to the PIC from the Pi.  Look for data pulses on pin 8 of the PIC when you are attempting to send data from the Pi.  If you don't see anything there, the problem is either with the Pi configuration or with the data path from the Pi to the TNC (make sure the jumpers are both on!).  If you do see data there, then check the Red LED to make sure it lights up when transmitting.  If you see data on pin 8, but don't get a a red LED, then contact me and I'll send you a replacement PIC (though there is possibility of a bad modem chip as well... this is unlikely if receive is working).

                    John W2FS

                     

                    On Fri, Apr 4, 2014 at 4:25 AM, John Wiseman <john.wiseman@...> wrote:

                     

                    Tommy,

                     

                    If you like I’ll take a look at it. I’m going to be away for most of April but could check it out when I get back.

                     

                    73,

                    John G8BPQ

                     


                    From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of coolcamper55@...
                    Sent: 04 April 2014 08:42
                    To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com


                    Subject: Re: FW: [Raspberry_Pi_4-Ham_RADIO] TNC-Pi

                     

                     

                    Further update, have buzzed out all connections from Modem IC and PIC IC  plus most of the board and all shown fine. I tried again with the Visual ANalyser software and have come to the conclusion that all I am getting from the probe points is mains hum.

                    I get a very low throbbing but definitely not a clear audible tone.

                     

                    Seriously running out of ideas, maybe time to dust off the tiny Track4

                    Tommy

                    MM0KNE

                     

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