ELECRAFT K4 - Page 25

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By default the same power output level is used on all bands. To save
power level per-band, set MENU:Per Band Power to On. With this setting,
a separate power output level for each band is also maintained for use
with Elecraft KPA-series amplifiers.
TUNE LP
Holding [TUNE LP] uses the power level specified by MENU:TUNE LP
(Low power TUNE). This is intended for use with external amplifiers
and antenna tuners that have specific drive power requirements.
XMIT
Tap [XMIT] to place the K4 in transmit mode. This is the equivalent of
holding a mic PTT button or asserting any of the other PTT lines (e.g.,
at the PTT IN jack). Tap [XMIT] a second time to exit transmit mode.
In CW, FSK, and PSK modes, tapping [XMIT] "pre-arms" the transmitter
for transmit, switching all downstream gear connected to KEY OUT.
However, no signal will be transmitted until the radio is keyed by some
method. Direct keying methods include a hand key or external keyer,
keyer paddle, attached keyboard, or the M1..M4 message buttons. A
computer can key the transmitter via the RTS and DTR pins on the
three serial ports, as well as by using remote-control commands (e.g.,
"TX;").
Also see VOX, which can be used for keying in all modes.
TEST
Hold [TEST] to enter TX test mode. In this mode, you can still key the
transmitter (and any gear keyed by the KEY OUT jack), but power
output will be zero.
The primary uses of [TEST] are: