derek Profile picture
Mar 20, 2022 3 tweets 2 min read Read on X
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)
[1/8]
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
[2/8]
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
[3/8]
Read 8 tweets

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