gqrx VS multimon-ng

There's an issue open for this: https://github.com/gqrx-sdr/gqrx/issues/1104

I could really use some help from a software build expert. Gqrx and all its dependencies would need to be built in CI with Apple silicon support, and I don't know how to do that.

If you don't need the web interface and your usual desktop SDR software supports rtl-sdr tcp mode, you can easily set up a small board that calls rtl-sdr with the appropriate parameters so that it will wait for a remote connection from the above software, not unlike what happens with WebSDR, but you would be using your usual desktop SDR application which would be native and much more snappy than a web browser. Here's an example using gqrx.

https://www.youtube.com/watch?v=74jDcHuDCmE

https://gqrx.dk/

GQRX works pretty well for me. There is also CubicSDR and SDRAngel afaik - you might just want to play around with them and see which you are most comfortable with.

SSB/CW (also (W/N)FM/AM/Raw) using GQRX

For most signals (including analog AM and FM modes) you can use a laptop with an RTL-SDR USB dongle (fairly cheap), or another SDR, and a reasonably tuned antenna. Various RTL-SDR models can tune from around 500 kHz up to 1.75 GHz with 3 mhz of bandwdith, and works with free software like SDR# for Windows and GQRX for Linux. It works with lots of other software, too, for ham modes, digital modes, etc.

Some of the Crossfire modules have a rudimentary spectrum analyzer function on them that might help you identify if there are other devices operating in the 900MHz band around that area, but I'm not sure the nano TX is one of them. I have a couple RTL-SDR dongles or equivalent I'd use with GQRX as a cheap spectrum analyzer if possible.

Good old GQRX for me https://gqrx.dk/

There is loads of software that will work such as SDR++, GQRX, CubicSDR, and SDRangel just to name a few. For HD radio reception, there is nrsc5. Nrsc5 only works with an rtl-sdr, so you will need one if you want to receive HD radio.

I have little experience with decoding radio signals so I don't know if any software decoders are expected to handle the clipping. I tried using multimon-ng and found that its UFSK1200 demodulator can get something out of the audio, but it also keeps repeating Error: stop bit is 0. Bad framing if verbose mode is enabled.

Sorry I gave wrong name, it is multimon https://github.com/EliasOenal/multimon-ng and is capable to decode:

It's likely that the signal is extremely strong. You can probably just pick it up with a short antenna indoors. I used MultiMonNG to decode. It's was pretty boring to be honest.

Give multimon-ng a whirl. This is CLI based, but can output what it decodes to a simple text file or hex data to do what you need with.

multimon-ng

POCSAG, FLEX (pagers), Morse, APRS and more with multimon-ng

multimon-ng for decoding various protocols.

Try this tool; https://github.com/EliasOenal/multimon-ng - It's CLI and you'll ideally want a Linux, but this can decode an awful lot more data modes like such.