A station with a switch knows something the log does not: which antenna
is actually connected. The working conditions hold what was PLANNED for
the band, and stay right until the operator throws the switch — after
which every QSO keeps claiming the other antenna.
Optional, and off by default: a station that names its antennas
differently in the two places would otherwise find its log quietly
rewritten. The name written is the one configured on the device, since
that is the name the operator gave it and the one they will look for.
WHICH PORT is the real problem, and the reason this is not a one-liner.
The switch has two, the radio has two jacks, and the QSO went out through
one of them; naming the wrong port's antenna is worse than naming the
band default, because it looks authoritative. The radio's own TX antenna
selection decides, and the jack-to-port wiring is a setting — it is the
station's cabling and neither device can report it.
When the port cannot be told — a transverter jack, a rig that reports
nothing, both switch ports live — nothing is written and the band default
stands. Silence beats a confident guess in a field nobody re-checks.
