Chang Zheng-2D - 2021-10-14

There are two unknown satellites transmitting in UHF amateur radio band found by @cgbsat.

According to Gunter’s website it should be one of these:

We perform with @PE0SAT some experiments by trying different modulations and baudrates to demodulate/decode the signals. With a quick search I think that the signals come from SSS satellites.


One of the satellites crossed the beam of the Dwingeloo telescope in SatNOGS Network - Observation 5318886 (beam crossing based on TLE indicated in the waterfall below). But given that there are plenty of other good observations, the problem is probably not SNR.


I can’t imagine this is helpful, but just in case…

If you isolate the strongest packet from

SatNOGS Network - Observation 5318886

… and resample to 192k audio, it does demod as 115,200 FSK producing a series of:

pdu_length = 4
contents = 
0000: c0 3d 7a 37

… probably a false-alarm but I wanted to contribute on the chance that it gives someone an idea.

-Scott, K4KDR


This looks like BPSK to me…

49322 drifted through the Dwingeloo beam again: SatNOGS Network - Observation 5351371

No IQ raw recording for this observation?

It’s at SatNOGS IQ data now (putting it there is a manual operation, I hadn’t done it yet).