▲ 12 r/RTLSDR
Decoded a METEOR-M2-3 LRPT pass and worked through the whole chain, antenna to image
Followed one pass end to end and analyzed each stage. The V-dipole's overhead null lined up with the SNR dip at TCA (though M2-3's antenna issue means polarization wander rides along too), and the measured Doppler sat on the SGP4 curve the whole pass. Watched the constellation go from a fuzzy disk to four clean QPSK clusters, EVM still ~60% at the end so FEC earns its keep.
My own writeup, full walkthrough with interactive plots: https://serana.ai/blog/vhf-lrpt-reception
Feedback welcome from people who do this regularly!
u/jeebkhan — 5 days ago