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Hello Lorin,

Here is my setup that I’m working on at the moment and really struggling with the decoding of beacon.
Raspberry Pi with TNC-Pi9k installed and a Baofeng UV5R radio for broadcast and listening with DIY cable.

So far I’m  sucessful with transmitting a beacon, but decoding what is coming in is failure so far, I decode one in 2000 randomly.

If you search the email archives here on this list, you will find a LOT of users having a broad range of issues with these cheap radios.? Some people have success with one radio but nothing but failures with another identical radio next to it.? It's very difficult to give specific reasons why but it usually boils down to poor quality control.? You can try to continue trying with this radio but the general recommendation is to just use a better radio.? Using a good radio will get you a lot more reliable results and far better decodes.

Anyway, that said, if you read Mark Griffith KD?QYN article on the TNCPi-9k6, Page 7 at , he states for the RX levels:
--
Most radios use a level of about 300-500mV for receive audio. Setting the receive audio register to
match would be necessary, except John has programmed into the software the ability for the receive
audio to be automatically adjusted depending upon the level seen on the RX input. This level is
constantly being adjusted. However, in my initial testing, I found that at 1200 baud, a receive audio
level of 50 (~500mV)
--

If you have an ocilliscope, then shoot for that 500mV target but most people don't have scopes.? Not all is lost though.? If you then scan down to the bottom of page 9, there is mention of the DEBUG port and how to connect to it.? It's possible that newer versions of the TNC firmware might give information about the receive level and how you might adjust the output level from your radio to best suit the input into the TNC.

The radio receives, the tnc board light up when receiving, but the nothing in the aprs software (aprx).

The LED you're talking about here is the DCD light meaning it's able to detect the lowest level HDLC bit pattern.? That's a good start but it doesn't mean the TNC is decoding any real higher level packets.

Played with radio volume, played with the rx setting, but no avail so far, anyone with some pointers would be great.

Doing a quick Internet search on:

?? tuning audio levels for TNC- "Pi9k"

gave several strong hits.? Try reviewing this one thread talking about this specific TNC and how to tune it:

?? /g/bpq32/topic/37942342#23364

--David
KI6ZHD