Solder on the components, solder on the cables, then provide some stress relief, (I use solid-core wire and heat shrink tubing), and you can use your UV5R with your smartphone for APRS on the cheap. I fell the Baofeng UV-5R is the best option because: The process is very simple to setup.

There are many options for node radios.

I tried connecting the two (2) Baofeng's UV-5R with a straight 2.5 mm - 3.5mm audio cable, but when I turn up the volume of the radio that function as a receiver (Rx), the radio that function as a transmitter (Tx) stop transmitting or transmit intermittently with a bad audio.

I'm trying to build a mini tactical repeater with two Baofeng UV-5R.

I have built the “777a080” version of your git repo, both for serial and for KISS.

The MicroModem is connected to my other Baofeng (UV-5R) and when the volume is at the maximum, it decodes the messages and shows it nicely both in cutecom and xastir.

User manual - 60 pages Programming manual - 5 pages Programming notes - 2 pages. UV-5R portable radio pdf manual download.

View and Download Baofeng UV-5R documentation online.

Serial To 2.5Mm