The CV-pin version worked slightly better, but it was still just barely possible to distinguish a voice over a standard commercial AM/FM receiver. The next attempt was with a XR2206 function ...

With AM radio, the amplitude ... since the audio signal is conveyed through changes in frequency, the FM receiver can just ignore changes in amplitude. The result: no static at all.

The AM-HRR3x-433 modules contain a basic 433MHz ISM band RF receiver able to demodulate a signal from a compatible AM transmitter such as an AM-RT4-433 (RS Part No ...