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Using the Sub Receiver
The KRX3 option adds an independent, high-
performance sub receiver to the K3. It allows you
to monitor a second frequency, using different
bandwidths or modes. Diversity receive is possible
if the main and sub receivers use different antennas.
Dedicated Sub Receiver Controls
Tapping
turns on the sub receiver (and
S U B
icon). VFO B then controls the sub's frequency, and
also serves as the TX frequency during SPLIT.
You should leave the sub turned off when not in
use. This turns off the -3 dB passive splitter used
when the sub receiver shares the main RX path.
Holding
links the VFOs (whether the sub
S U B
receiver is on or off). The kHz decimal point of
VFO B flashes as a reminder. VFO A is the master,
moving both VFOs in tandem.
Holding
for 2 seconds or longer turns on
S U B
diversity receive (see next page). The kHz decimal
point of VFO A flashes as a reminder. VFO A
controls both the main and sub frequencies in
diversity receive, but VFO B remains independent
so it can be used as the SPLIT transmit frequency.
SUB AF gain normally sets the sub's volume
level. Alternatively, SUB AF can be used as a
main/sub balance control (see CONFIG:SUB AF).
With stereo headphones or dual speakers, you'll
hear the sub on the right and main on the left.
Otherwise main and sub receiver audio are merged.
CONFIG:SPKRS must be set to 2 if you use
stereo speakers; otherwise, set it to 1.
SUB RF gain normally sets the sub receiver's
RF GAIN level. If this knob is assigned to main/sub
squelch (CONFIG:SQ MAIN), then both main and
sub RF gain are controlled by MAIN.
BSET: Additional Sub Receiver Controls
Normally, receive controls apply only to the main
receiver. This includes SHIFT, WIDTH,
, etc., as well as
AT T N
M O D E
settings for the sub receiver, first hold
A will show
, and the S-meter will show the
B S ET
sub receiver's signal level. After you've made the
desired sub receiver changes, tap
to exit
.
B S ET
B S E T
SUB
,
P R E
. To change these
. VFO
B S E T
or hold
A/ B
The sub receiver's band cannot be set
independently unless CONFIG:VFO IND is set to
YES. If it's set to NO, you'll see =MAIN when
you tap BAND during BSET, and the sub
receiver band will always be set the same as main.
Sub Receiver Antenna Selection
The sub receiver gets its RF input either from the
main receiver (sharing ANT 1-2 or RX ANT IN), or
from its auxiliary antenna input (see Owner's
Manual, Main and Sub Receiver Antenna Routing).
When using
B S ET
sub between
MAIN
AUX input). When
R X
icons show which antenna the sub is sharing
with the main receiver. When
these icons will all be off (if CONFIG:KRX3 is set
) or will show the non-transmit
for
ANT=BNC
ATU antenna,
1
or
).
AN T=ATU
Shortcut: If you're not in
quickly switch the sub between
holding
R X AN T
ANT on/off for the main path.)
The sub receiver's AUX antenna must be
well-isolated from the main (transmit) antenna
to avoid activating the sub receiver's carrier-
operated relay.
Using the AUX input for the sub receiver
slightly improves sensitivity of both the main and
sub receivers because the splitter is not used.
Sub Receiver Band Independence
If CONFIG:VFO IND is set to
the sub receiver to a different band from main.
Hold
, then tap
B S E T
sub receiver's band. If you only use band-
independence for the sub occasionally, you may
want to assign VFO IND to a programmable
function switch (See Owner's Manual, Basic
Operation, Programmable Functions).
If the two receivers are sharing the main
antenna path, putting the sub receiver on a
higher-frequency band than main may result in
signal loss in the sub. This is due to sharing of the
main receiver's low-pass filters. To avoid sub
44
, you can tap
to switch the
AN T
(shared) and
AU X
(the sub's
is in effect, the
MA IN
AU X
is in effect,
(if KRX3 is set for
2
mode, you can
B S ET
and
M A IN
. (Tapping
turns RX
R X AN T
, you can set
YES
up/down to select the
B AN D
-
and
1
2
by
AUX
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