Elecraft's release note settles it: SW; returns the most recent reading in
transmit or TUNE as three digits in tenths of a ratio — SW023 is 2.3:1,
and SW999 is the 99.9:1 it reports instead of infinity.
This asked for four, so every answer failed to parse and the bar stayed
empty for the whole transmission. A tester saw exactly that: no SWR at
all, which reads as an unsupported radio rather than an off-by-one.
SW also comes out of the probe list. It is known now, and asking again
mid-transmission costs a round trip on the link the carrier depends on.
rouggy
8e0865a71f