derek Profile picture
Mar 20, 2022 3 tweets 2 min read Twitter logo Read on Twitter
Today's reception of Turkmen analog TV via Meridian 9, thanks to @2019Casandro for his decoder!
Now also with audio recorded with a separate SDR
A few people asked about the hardware I use. Main part is a 2.5m offset dish, feeding a 5.5 turn helix. Signal then goes through a custom Meridian LNA followed by a line amp. Then a bias-tee, and in this case also a splitter and two SDRs ImageImageImage
As @coastal8049 already explained, this is possible because the satellite receives in a band that's used by TV broadcasting (among other things).
A few times a day it passes through the main beam of the TV tower, allowing it to relay a relatively strong signal Image

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More from @dereksgc

Apr 15, 2022
I got a recording of the FengYun-2H telemetry from @hmdsamarasekara who can receive it much stronger than I ever could, so here's a short thread on what I noticed about it just to conclude the topic (at least for now)
It uses the "classic" double sideband modulation, so when demodulated I gain about 3dB on the signal.
Three sidebands in total, BPSK digi at 32 kHz, periodic pulse at 75 kHz, and some yet unidentified FSK around 165 kHz
The BPSK data seems to be 2000 bps, using 1024-bit long frames. For some reason I can't get a proper lock on it and the constellation (and symbols) keeps inverting and splitting, but that's something to tackle at a later point
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