Signal doesn't really mean anything, it's just the averaged voltage level received at that frequency regardless if it's a sat or the sun.
The quality is the ratio of decoded bits received without relying on the redundant error correction bits which is far more useful as it indicates that your box is actually decoding something useful.
Possibly indicates you may not on D3 have the centre frequency selected or the skew might not be ideal.On C1 I get S 74, Q 100 but on D3 I get S 82 Q 91.
A quality of less than 100 indicates that your receiver is relying on a portion of the error correction bits to recover from the errors.
With most transponders using 3/4 FEC a quarter of the transmitted bits are redundant to recover from errors. On the DVB-S2 transponders the FEC is 3/5 so 40% of the bits in the stream are for error correction.
So if your quality level dropped down close to 75% you would have some serious picture break up and most likely couldn't even decode at all as the ECM's couldn't be correctly decoded.
Percentage of bits succesfully decoded prior to relying on error correction FEC bits.And what is the scale relative to, anyway?
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