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jeroenbeijer / SDRReceiver

An SDR Receiver purposely for JAERO
MIT License
26 stars 6 forks source link

Dropping frames and Bad CRC on RPi3+ #23

Open acarsGuy opened 1 year ago

acarsGuy commented 1 year ago

Hello, I want to run this software and some JAERO instances on a RPi3+. But the JAERO instances generating Bad CRC / Dropped Frame warnings continuously. The CPU runs at 65-70%, RAM is about 70% used. So the RPi seems not to be overloaded, but the software seems not to work correctly. Any ideas how to solve this?

Thanks

jeroenbeijer commented 1 year ago

Hi,

What kind of channel are you trying to decode 600/1200/10500/8400 and what does the spectrum look like in jaero? Are you seeing a good signal in jaero and have you selected the right mode?

/Jeroen

acarsGuy commented 1 year ago

I use 600/10500 bps channels. The signal looks good in JAERO. SNR is >10dB,but only rarely JAERO is able to decode msgs. The constellation display shows strange behavior: The yellow tufts sometimes "rotate", or look smeared in a circle. or are smeared crosswise. Running the same setup on a PC works well.

jeroenbeijer commented 1 year ago

I think I recall Jonti had issues running on Pi3 before and I added the option to run with a 288K sample rate at that time. I think the device has trouble keeping up at the higher sample rates. You could try with 288000 sample rate and ony 1 or 2 600 VFO's and see if that works. 288K has some other issues related to the dongle though but it is worth a try.