Hi All, I hate reaching out like this, but I'm at the limit of my knowledge. I've got some AMPS handsets i'd like to make use of-back to my PBX if possible. The problem is, i've not been able to get AMPS to work with any of the SDR's I have. I have a HackRF, A URAN1 and a Pluto. I can open the URAN as a USRP device with the following: amps --sdr-soapy \ --sdr-device-args "driver=uhd" \ --sdr-channel 0 \ --sdr-samplerate 1000000 \ --sdr-bandwidth 250000 \ --sdr-rx-gain 20 \ --sdr-tx-gain 30.0 \ -k 334 -T CC/PC/VC \ -k 336 -T VC \ -p -s 192000 -o --fast-math Which appears to work, but the radio doesn't ever actually transmit, the SDR works, because I use it with OpenBTS to make a GSM station. I spent a $400 on a secondhand limeSDR mini, but that turned up broken in the post. Is there an easily obtainable SDR that anyone else has got working? Thanks, Nick