Hi Igor, and all,
Bill has it exactly right. All messages in the HF implementation of
WSJT-X have the same degree of FEC.
As far as the protocol is concerned, there's nothing wrong with using
messages of the form
"K1ABC W9XYZ RR73". It works because "RR73" is a legitimate Maidenhead
locator. This usage does not lead to confusion because the
corresponding location is somewhere far north of Siberia, in the Arctic
Ocean. Nobody is likely ever to transmit JT65 from there.
Use of RR73 is not standard JT65 practice, and it is not one of the
default or "recommended" JT65 messages. Arguably it's less polite; it
implies that the sender wants to move quickly to another QSO and be
finished with this unimportant one.
But of course anyone can use it if they wish.
-- Joe, K1JT
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