I started testing the SA818v 144MHz FM transceiver module, which appeared very cheap (around 15 Euro) and simple to configure. I haven't tested the TX side yet but, after some struggling, I understood that the RX sensitivity (declared -124 dBm) was insufficient  in my situation. In fact two APRS iGates that I received at around -40dBm with my Sdrplay RSP1, were barely listenable and not decodable using the SA818v receiver.

For this test I sent the audio output from the SA818V or from thr Sdrplay RSP1 to the GQRX SDR receiver (which has built in AFSK 1200 decoder) on Ubuntu 22.04  or to the Direwolf software