I’ve noticed, and judging from the lively discussion on enforcing split
operation, others have too, that when I call CQ, lots of folks call me on my
exact transmitting frequency, resulting in no decode for any reply.
The developers of N1MM faced a similar situation with packet-spotted replies.
When everyone pounced on a new CW packet spot at the same time on the same
frequency, the result was an indecipherable mess of dits and dahs. Their clever
solution was to add an optional random offset to the frequency to a reply to an
incoming packet spot of 30Hz or 60Hz. This spread signals out enough to help
the situation considerably.
It strikes me as a variation on that trick might help out FT8 QRM. FT8 appears
to be able to decode signals only a few Hz apart. Why not add an option to
add/subtract a random offset of up to +/-15 Hz or so to any reply to a CQ? This
would make decoding much more likely and add negligible additional QRM to the
band.
Ted
K9IMM
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