Satellite transponders use 2/3, 3/4 and 5/6 FEC. In ideal interference free conditions, the higher the FEC the higher C/N needed to get you over the threshold of pixel free reception.
2/3 FEC is very forgiving, using a spectrum analyser 5dB from the noise floor to the signal peak is good enough. 3/4 needs 9dB and 5/6 at least 10dB.
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