My last video on Russian Meteor satellites was pretty popular, so I did a follow up now that another satellite in this series has been launched. This one is brand new, going into orbit June 27th of 2023. It replaces the older Meteor M2-2 that suffered damage earlier this year and stopped transmitting on 137mhz.
I had a lot of trouble getting the signal from this one recorded and processed, and there are probably things I could have done better. What seemed to work best for me was:
1: Looking up pass times on n2yo.com
2: Recording the signal on 137.9Mhz during the pass, with a RTL-SDR v3, SAWbird-NOAA filter, and QFH antenna connected to a Raspberry Pi computer (timeout 15m rtl_fm -M raw -s 120000 -f 137.9M -E dc -g 48 -p 1 raw_dump.raw)
3: Converting that output to a wav file (sox -t raw -r 120k -c 2 -b 16 -e s “raw_dump.raw” -t wav raw_dump.wav)
4: Opening the wav file in Satdump, using pipeline for Meteor M2-x LRPT, and using frequency offset of 1 and DC blocking on.
Satdump-ui seemed to work more reliably on a Linux desktop than Windows.
Satdump can be found here: https://github.com/SatDump/SatDump
Raspberry-NOAA v2 (which may eventually have an automated script for this): https://github.com/jekhokie/raspberry-noaa-v2
QFH Antenna instructions: https://usradioguy.com/wp-content/uploads/2020/05/20200307-How-To-Build-A-QFH.pdf
More info on Meteor M2-3 Satellite: https://usradioguy.com/satellites/meteor-m-no-2-3/
My prior video on Meteor M2-2: https://www.youtube.com/watch?v=w_QpKGK0tuE
Prior video about my Cyberdeck: https://www.youtube.com/watch?v=L8XOqrKBM5w
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