>I have been digesting the "The FT4 and FT8 Communication Protocols"
paper, and something is just not clicking for me, and I think I need to see
it graphically.
>Does anyone have or a link to a raw packet diagram for the 77 bit payload
broken down by bits? My Google-fu is not paying off today.
Hi Warren,
I don't have link nor a graphic diagram, but perhaps this character based
presentation helps a little.
You need use a constant width font e.g. Consolas to get it correctly.
Standard message
10 20 30 40 50 60 70
1234567890123456789012345678901234567890123456789012345678901234567890123456
7
iiiccccccccccccccccccccccccccccrccccccccccccccccccccccccccccrRgggggggggggggg
g
3 28 128 1115
Field day
10 20 30 40 50 60 70
1234567890123456789012345678901234567890123456789012345678901234567890123456
7
iiinnnccccccccccccccccccccccccccccccccccccccccccccccccccccccccRnnnnkkkSSSSSS
S
3 3 28 28 14 3 7
EU VHF
10 20 30 40 50 60 70
1234567890123456789012345678901234567890123456789012345678901234567890123456
7
iiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhRrrrsssssssssssgggggggggggggggggggggggg
g
3 12 22 12 11 25
correctly I picked three different message types as examples. The first
ruler gives tens of bits and second you may guess. The message bits are
marked with the bit-field tags used in Table 1 and last line in each gives
how many bits are in each bit-field for each tag character.
Bit-field purposes are defined in Table 2 and details in Appendix A. Even
Appendix A refers further to algorithms that finally define bits. Some of
those are complex and impossible to present as a linear mapping to bits.
Hope this gives some inside look into an efficient source coding.
73, Reino OH3mA
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