Band and Mode Selection
Tap either end of BAND to select the desired ham
band (160 through 6 meters). You
can use direct
frequency entry (pg. 15), or recall a frequency
memory (pg. 16). Individual bands can be mapped
out if not needed (see CONFIG:BND MAP).
Tap either end of MODE to select the operating
mode. Hold ALT to select an alternate mode, if
required. This include CW REV (pg. 32), DATA
REV (pg. 33), AM- S (synchronous detection, pg.
31), and FM +/- (FM repeater split, pg. 31).
Antenna Selection and Matching
Main Antennas (ANT1 and ANT2)
With a KAT3A ATU installed, you can connect
antennas to both ANT1 and ANT2; tap ANT to
select. Holding ATU selects AUTO (autotune
enabled) or BYPASS mode. In AUTO mode
(ATU icon on), the antenna can be matched for best
SWR by tapping ATU TUNE. Up to 30 ATU
settings are saved for both antennas. See CONFIG:
KAT3 for instructions on clearing ATU memories.
The ATU icon will flash briefly whenever new
settings are automatically loaded.
Tapping ATU TUNE a second time within 5
seconds starts a more extensive match search. The
ATU can even be manually tuned if desired. Refer
to CONFIG:KAT3A for details.
Holding ANT allows names to be assigned to
ANT1 and 2 (e.g., ‘YAGI’). These will be flashed
when you switch antennas. When editing names,
VFO B selects the character position to change;
VFO A cycles through available characters. Setting
the first character to “- ” disables name display.
Receive-Only and 2-Meter Module Antennas
Tap RX to select the receive-only antenna (RX
ANT IN/OUT on the KXV3B module, pg. 41). The
KRX3A sub receiver either shares the main
receiver’s selected antenna or uses an auxiliary
input (see AUX RF, pgs. 39 and 43).
If a K144XV 2-meter module is installed, connect
its antenna to ANT3. (See K144XV manual.)
Automatic control of a KAT500 ATU
The K3S can automatically recall settings for a
connected KAT500 ATU as the VFO is tuned. See
CONFIG:KAT3A and the KAT500 owner’s manual.
Using the VFOs
VFO A is both the main receive and transmit
frequency, except during SPLIT, in which case
VFO B controls the transmit frequency (pg.38).
VFO B also controls the sub receiver (pg. 39).
Tap RATE to select 10 / 50 Hz per step. The faster
rate can be changed using CONFIG:VFO FST.
The number of counts (or steps) per VFO knob turn
can be changed using CONFIG:VFO CTS.
Tapping RATE briefly flashes either the 10-Hz or
100-Hz digit to indicate slow or fast tuning.
For 1-Hz steps, tap FINE ; for wider steps, use
COARSE (CONFIG:VFO CRS sets coarse steps
per-mode). When FINE is in effect, a 1-Hz digit
will appear in the VFO A display. When COARSE
is in effect, the 10-Hz digit is not shown.
Tap A B once to copy VFO A’s frequency to
VFO B. Tapping A B a second time within 2
seconds also copies VFO A’s filter setup, preamp
state, and other settings to VFO B.
A / B exchanges VFO A and B and their settings.
(Also see CONFIG:VFO B->A.) Pressing REV
only exchanges the VFOs for as long as you hold
it in. (Exception: When using an FM repeater
offset, REV permanently swaps RX/TX.)
VFO B and the sub receiver can be set up directly
by holding BSET. While B SET is in effect, all
icons and VFO-related controls apply to VFO B
(and to the sub receiver, if turned on; see pg. 39).
Holding SUB turns on diversity mode (pg. 39).
RIT and XIT
The RIT/XIT offset control, at the far right, sets the
offset for RIT and XIT. The offset is shown on the
VFO B display as you adjust the control. Three
LEDs show whether the offset is 0, (-) or (+).
Tap CLR to zero the RIT/XIT offset. Tapping it a
second time restores the offset.
To copy the present RIT offset to VFO A, hold
CLR for 2 seconds. VFO A will be moved to the
new frequency before the offset is zeroed.
If RIT/XIT are both off, the offset control can
coarse-tune VFO A (CONFIG: VFO CRS). Coarse
tuning steps are programmable by mode.
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