Got my first station (https://network-dev.satnogs.org/stations/247/) up and running and been doing some observations during the day. My setup is basically a 137Mhz turnstile antenna, no LNA and rtl-sdr (RTL2832U). I’m using a raspberry pi 3 setup with the satnogs image.
Your RF frequency is off by several kHz, so you need to adjust the PPM somewhere in the config. The signal on the waterfall should be centered around 0 Hz.
Frequency error in FM will manifest itself as DC offset in the audio. If the frequency error is severe, which is the case here, the audio will get distorted. You can both hear the distortion and see harmonics in the audio spectrum. I think that’s the reason why the decoder can not decode it.
Try a reboot!
Maybe some of the files in /tmp have changed the owner with your experiments.
You could try to fix that manually, but a reboot is less work
I adjusted the PPM and everything seems a lot better. Got some images now, and also managed to decode telemetry from Nayif-1 and FOX-1D. Having lots of fun