QSSTV
9.4
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Settings for HF and VHF/UHF are very different.
General rules of thumb:
Mode A: most demanding, used on VHF/UHF
Mode B: use on HF/VHF/UHF
MODE E: least demanding, used on HF
QAM 64 : most demanding, used on VHF/UHF in really good conditions
QAM 16 : used on VHF/UHF in fairly good conditions sometime also on HF
QAM 4 : least demanding, used on HF
Bandwith:
Protection:
Interleave:
Reed-Solomon:
Reed-Solomon provides Forward Error Correction by adding redundant bytes per block of 255 bytes.
More errors can be corrected when more redundant bytes are used.
This adds overhead to the transmission.
Always use Reed-Solomon encoding on HF bands.