Integrates the fix/jtdx-kenwood-tx work onto main: the Kenwood/Elecraft backend's
"data" data-mode path now sends MD6 then DT0 so a K3/K4 lands in DATA A — the
audio sub-mode FT8 uses. MD6 alone could leave the rig in an FSK/PSK sub-mode
where it keyed but the rear sound-card audio never modulated ("transmits but
nothing comes out"). The data-mode option is relabelled "DATA A — MD6+DT0
(Elecraft K3/K4)". A shared Kenwood/Elecraft backend is kept (the K3 emulates the
Kenwood dialect); the Elecraft specifics live behind the data-mode seam rather
than a 7000-line duplicate backend.
rouggy
626edca8ba