Specifications

36
SPLIT and Cross-Mode Operation
Normally, VFO A is used for both receive and
transmit. When SPL I T mode is selected, VFO B
becomes thetransmit VFO. In this case the SPLT
icon turns on, the TX arrow points to B (pg. 12)
and the yellow delta-F LED (∆f) turns on if receive
and transmit frequencies or modes differ.
Cross-mode operation is possible in some cases,
such as SSB/CW. You can use B SET to directly
change the mode of VFO B (pg. 22).
You can transmit in CW when SSB mode is
selected by just hitting the key or paddle; there’s no
need to use cross-mode split in this case. The SSB
station will hear the signal at your sidetone pitch.
See CONFIG:CW WGHT.
Extended Single Sideband (ESSB)
An increase in SSB voice bandwidth may improve
fidelity and reduce listening fatigue.
The K3’s normal SSB receive bandwidth is about
2.7-2.8 kHz. If you have a 6 kHz filter installed,
you can use WI D TH to select a wider passband.
ESSB transmit is set up as follows:
 In CONFIG:TX ESSB, change the parameter
from OFF to one of the provided selections
(3.5, 4.0, etc.). See cautions below.
 With ESSB enabled, the transmit EQ menu
entry name changes to MAIN:TX*EQ to allow
youto independently adjust EQ at the selected
wider bandwidth. The amount of adjustment
required at each EQ band may vary depending
on the selected ESSB transmit bandwidth.
 You can assign TX ESSB to a programmable
function switch, to alternate between ESSB TX
OFF andthe last-selected wider bandwidth.
Carrier and spurious signal suppression,
passband shape, delay characteristics, fidelity,
and other aspects of ESSB performance are not
specified. Use ESSB only after carefully
monitoring your signal.
General-Coverage Receive
The KBPF3 option module includes band-pass
filters that cover the areas between ham bands. The
K3 will switch between its narrow ham-band filters
and the KBPF3 filters as youtune the VFOs.
A KBPF3 module can be installed on the RF board
(for use with the main receiver), and a second one
on the sub receiver module (KRX3).
CONFIG:VFO CRS selects COAR SE VFO tuning
rate in each mode. AM coarse tuning rates include
5, 9, and 10 kHz.
Sensitivity below 1.8 MHz will be reduced due
tothe high-pass response of the T-R switch, which
protects the PIN diodes.
VFO B Alternate Displays
The VFO B display can showtime, date, RIT/XIT
offset, supply voltage, current drain, KPA3 heatsink
temperature (PA), and front panel compartment
temperature (FP).Tap DI SP to turn the selected
alternate display on or off. Rotate the VFO B knob
to select the desired display.
If CONFIG:TECH MD is ON, additional VFO B
alternate displays will be available. PLL1 and
PLL2 show the main and sub receiver synthesizer
PLL voltages; if either is out of range, (*) will
appear. AFV shows the true RMS value of receiver
AF output (mVp-p). This is not affected by the AF
GAIN control. After the AFV reading has
stabilized, you can use VFO B to select dBV,
which is useful for comparative signal strength
measurements. AFV and dBV both apply tothe
main receiver unlessthe sub receiver is turned on.
Also see CONFIG:AFV TIM.
Alarm and Auto Power-On
Once you’ve set the K3’s real-time clock
(CONFIG:TIME), you can use MAIN:ALARM to
set an alarm. This can be used to remind you of a
schedule or net, or to start warming up for a contest.
When an alarm is set, (*) appears in the time
display. (Time can be displayed by tapping DI SP .)
The K3 will turn ON automatically if it was off
at alarm time. It will be on the last-used band.