Re: DRAWS - not able to receive APRS #aprs #direwolf #ax25

Mark J Culross

Basil (n7nix):

Thanks for your advice.  I believe that I understand all of your instructions & have executed them as directed, but APRS RX is still not working.  I did find that I could make quicker modifications of the connections/resistors using the DRAWS Manager selection for the desired audio pin . . . does that have the same effect as the changes you described & is it OK to use the DRAWS Manager to switch between resistors connected to IN1_L & IN2_L ??

As Corky suggested, I tested the receive path using fldigi (after stopping AX25/direwolf) & BTW, I also had to manually install libjpeg for fldigi to work, even though I am using the latest image (I found your reply with instructions elsewhere on the forum).  Using the waterfall display in fldigi (with the radio still on 144.390), I did confirm that audio is present on both pins (4/DISC & 5/AF) from the IC-7000 in VHF/FM mode.  Using either pin (4/5), I see the waterfall change whenever I hear a packet on the radio & the waterfall goes completely blank as expected when I select "OFF" for the left side DIN6 audio pin (udr0).

As I mentioned to Corky, I have not yet done anything with the transmit path, other than cause a test position message to be sent to verify PTT functionality.  For now, I'm just concentrating on trying to get RX of APRS to work, since I really thought that would be the easy case !!

Mark J Culross

On Sunday, September 13, 2020, 2:08:08 PM CDT, Basil Gunn <basil@...> wrote:

First thanks for all the console output.

> The radio (IC-7000) is attached to the left side DIN6 connector
> (udr0). I also ran the "" setup script.

This could be your problem since that script tries to set up deviation
for the HF radio. You need to set deviation for the VHF/UHF radio in the
IC-7000. I would turn off discriminator receiver routing and turn on
compensated audio. I am not sure if the IC-7000 radio supports
discriminator out for vhf.

This is what you currently have, set by the setalsa script.

IN1        L:[10 kOhm]    R:[10 kOhm]
IN2        L:[Off]        R:[Off]

You want to flip these controls for Left channel manually. ie. turn off
IN1 & have 10 kOhm for IN2.

Run alsamixer from a console
press F6, select sound card
  - select udrc
scroll to the right until you find:
IN1_L to Left Mixer Positive Resistor [10 kOhm]
  - turn that off by typing <down-arrow>

Continue scrolling to the right until you find:
IN2_L to Left Mixer Positive Resistor [10 kOhm]
  - turn that ON by typing <up-arrow> once only

exit to save new settings

Be aware that there are both positive & negative resister controls ie.
IN1_L to Left Mixer Positive Resistor [Off]
IN1_L to Right Mixer Negative Resistor [Off]

You only want to set Left Mixer Positive Resistor control.

Verify by running

You need to confirm your deviation.

Go to this link

This will lead you through how to output a steady audio tone that you will
monitor with an HT or some other radio in your shack.
Be sure to read the John Ackermann N8UR link.

/Basil n7nix

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