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.
The transmit meters were read on k.tx, which records only that OpsLog
keyed the radio. An operator using the front-panel PTT, a footswitch or
the mic button therefore had a panel that believed the rig was receiving
— and since the power and SWR bars are read only while transmitting,
they were never read at all. IF carries the radio's own transmit bit;
that is what decides now.
The meter probe logs RAW answers rather than parsed numbers, and asks a
wider set (SM, SMH, BG, SW, PO, TQ). A command answering in a shape we
did not expect is the interesting case, and parsing hid it behind the
same dash as a command the radio refused — which is what still stands
between us and a working SWR reading on a K3.
Both are the same bug. ReadState returns early while transmitting — the
rig answers '?;' to IF; then, and treating that as a fault used to drop
the link — but that early return also skipped the panel update and the
meter read.
So the panel believed the radio was still receiving. Pressing MOX again
therefore sent ANOTHER transmit command instead of RX, and the K3 stayed
keyed, exactly as reported. And the power and SWR bars were only ever
read at the one moment they mean nothing.
Reading meters while transmitting needs one more guard: a '?;' then says
when the question was asked, not what the radio supports, so the
unsupported-command memory is suspended for that read. Without it, one
badly timed refusal would silence a meter for the rest of the session.
Adds RIT/XIT offset control (±10/±100 Hz, offset shown), a 4.0 kHz filter
button for FT8, and logs the K3's icon word when it changes: there is no
command for 'is the ATU in line', the reference says the switch functions
show up as icon changes, so an operator toggling the ATU while watching
the log will name the bit and the button can then light up honestly.
SWT20 was written from memory of the reference rather than from Table 7,
and 20 is not an ATU switch at all — it would have pressed something else
on a real K3. An operator read the table out for us: switch 19 is the ATU
row, TAP for a tuning cycle and HOLD for tuner in line or bypassed.
Adds the HOLD as its own ATU button, because on the radio they are two
different things: tuning is a cycle you start, bypassing is a state you
leave it in.
Power takes 0-110 W on an Elecraft, per the reference — a K3 makes a
little over its rated output — while a Kenwood keeps 200.
So the tester can exercise everything in one session instead of one
control per build: RF and mic gain, squelch, preamp, attenuator, NB, NR,
AGC, filter width, antenna, RIT/XIT with a clear, and the keyer speed.
The analogue scales differ between an Elecraft and a Kenwood — RF gain
000-250, mic 000-060, squelch 000-029 against 0-255 — so each is mapped
through its own full scale and shown as a percentage. Using one rig's
range on the other silently halves or doubles every setting.
Antenna only appears when the radio answers AN: a K3 without the internal
ATU has one socket, and a switch that goes nowhere is worse than none.
The Elecraft backend already existed; what was missing was somewhere to
operate the radio from. This adds the panel, on the Kenwood-dialect
client the K3 already speaks, in a tab of its own beside the Yaesu and
Icom consoles.
Scope is the six controls asked for and nothing else. Every extra command
added without a radio to test it against is a control that may or may not
do what its label says, and a K3 exposes dozens.
No K3 was available while writing this, so the two halves are treated
differently. The setters are the commands the reference documents
unambiguously and whose effect is visible and reversible (PC, AG,
TX/RX). The meters are the opposite: their scaling differs by model and
firmware, so the raw answers are logged next to the power setting, the
panel says the scaling is provisional, and an unmeasured SWR shows as
'—' rather than as a perfect 1.0 — a good match on an antenna nobody
measured is the reading that costs a radio.
ATU tune sends SWT20 (the K3 front-panel tap) and logs exactly what it
sent, so a wrong mapping names itself instead of leaving an operator
guessing which button OpsLog pressed.
rouggy