90 ELECRAFT
Power Control
Turn the POWER control to set the power output directly in watts
(e.g., P 5 . 0 ). The normal range of the control is 0.1 to 15 watts.
If you have the KPA100 option installed and enabled, the range is
0.1 to 110 watts, with the amplifier module disabled at 10 watts or
lower. In CW mode, you must send a few CW characters or press
T U N E to allow the ALC (automatic level control) to lock-in the
new power level.
Requested vs. Actual Power: The POWER control sets the
requested power, which may exceed the actual power that the
transmitter can achieve. To see actual power output, use
T U N E (see
below). In tune mode, the display always shows the actual power
output (except when the display is showing voltage and current, or
when the ATU is doing an autotune). The power displayed will be
accurate to within about 10% if the load at the antenna is matched
(50 ohms).
Using
T U N E : Hold T U N E to key the transmitter. You’ll hear one
beep when you start tune, and another when you terminate tune by
tapping any switch or hitting the keyer paddle.
ATU: If you're using a KAT2 or KAT100 automatic antenna tuner,
pressing
T U N E will drop power to either 2 or 20 watts maximum
(depending on whether the KPA100 is in use), and may trigger a re-
tune of the antenna matching network. You can also override
power reduction by holding
T U N E + D I S P L A Y (see page 91).
Current Limiting: To protect the transmitter and power
supply/battery from excess current drain, you can program a
transmit current limit using C A L C U R (see Calibration
Functions).
VFO Selection
To select the A or B VFO, tap A / B . To set the unused VFO equal in
frequency to the current VFO, tap
A = B . The currently-selected
VFO will determine both the transmit and receive frequencies unless
you’re running SPLIT (see below). A and B VFO frequencies are
saved in EEPROM on a per-band basis, and are updated periodically
(see Backup Timer at the end of this section).
Split and Reverse Operation
Split operation means transmitting and receiving on different
frequencies. This is useful for DX work, since many DX stations
will ask you to call them above or below their carrier frequency to
avoid interference. To enter split mode, hold
S P L I T until the
message S P L I T appears on the LCD. Holding
S P L I T in again will
display N O R (normal). The active VFO annunciator (A or B) will
flash slowly when you’re in SPLIT mode to remind you that this
feature is enabled and that your receive and transmit frequencies are
different. Also, each time you transmit when in SPLIT mode, the
transmit frequency is displayed for a minimum of 1/2 second.
When you're using split, you can switch between your transmit and
receive frequencies by tapping
A / B . However, there are times when
you only want to quickly listen on your transmit frequency, not
switch VFOs. In this case you can hold in the
R E V switch (reverse),
which temporarily swaps the VFOs. When you release REV, the
LCD will return immediately to the receive frequency. When using
split, experienced operators can simultaneously hold in the REV
switch and adjust the VFO knob--all with one hand--to quickly find
a clear spot to transmit. (
R E V overrides VFO lock as described
previously.)
You can install an LED on the front panel that will turn on
whenever SPLIT, RIT, or XIT is in effect. See the associated
application note, Adding a SPLIT/RIT/XIT LED to the K2.
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