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daniestevez / gr-satellites

GNU Radio decoder for Amateur satellites
GNU General Public License v3.0
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Create AZAADISAT-2.yml #436

Closed janvgils closed 1 year ago

janvgils commented 1 year ago

New launch https://twitter.com/SpaceKidzIndia/status/1623643412250652672

daniestevez commented 1 year ago

Hi, thanks for this.

I was reviewing this document and thinking that it doesn't say clearly that it uses FSK AX.25. It could either be AFSK or FSK, although "Frequency shift: 425 Hz" perhaps points more to FSK, since the standard AFSK tones do not use this shift. I'm also worried by "Stop bits: 1", which is something that belongs to UART and has nothing to do with HDLC, which is what AX.25 does. Since it seems they've used a LoRa chip, if they haven't implemented things properly, the outcome won't be AX.25 compatible.

I thought of comparing with AzaadiSat-1, and found that we already discussed similar things in #392. There we had a sample recording and apparently we were able to decode it as FSK AX.25.

Therefore, I'm going to assume that AzaadiSat-2 is equal to AzaadiSat-1 in this respect and merge this. It will be good to test the decoder with some recordings.

daniestevez commented 1 year ago

Just seen some decodes in Twitter using FSK AX.25: https://twitter.com/scott23192/status/1623971689359978498

K4KDR commented 1 year ago

Downloaded 'AZAADISAT-2.yml' and can confirm that it decodes properly from an FM demod audio file that I recorded from I/Q replay after one of the passes here last night.

gr-satellites-YAML-decode