17
Rear Panel
Connector Groups
The appearance of your rear panel may vary
depending upon the options installed.
Antennas: ANT1 (SO-239) is standard. ANT2
(SO-239) is supplied with the KAT3 automatic
antenna tuner option, which includes an antenna
switch controlledfrom the front panel. Both jacks
are nominally 50 ohms when the ATU is bypassed
or not installed. The AUX RF connector is for use
with the KRX3 option; see pg. 37 and pg. 40.
DC: 12 VDC IN jack is an Anderson PowerPole
connector rated at 30 amps. (See Specifications, pg.
8, for detailed power requirements.) 12 VDC OUT
(RCA/Phono) provides up to 0.5 A (switched) for
use with accessory devices. Ground Terminal: A
good station ground is important for safety and to
minimize local RFI.
KPA3: This option panel is blank in the K3/10. In
the K3/100, the blank panel isreplaced with the fan
panel shown, which includes a circuit breaker.
KIO3 (pg. 18):The KIO3 is an upgradeable digital
and audio I/O module providing computer and
auxiliary control signals, single or dual (stereo)
speaker outputs, line level in (mono) / out (stereo),
and supplemental headphone (stereo) and mic jacks.
KXV3: The KXV3 provides a variety of RF I/O
signals, including receive antenna in/out (pg. 40),
transverter in/out (pg. 38), and a bufferedI.F.
output (pg. 38).
Keying: PADDLE(1/4” phone jack) is the keyer
paddle input (see CONFIG MENU, CW PDL, pg.
52). KEY (1/4” phone jack) can be used with a
hand key, external keyer, computer, or other keying
device. PTTIN (RCA/Phono) is for use with a
footswitch or other external transmit control device.
KEY OUT(RCA/Phono) is the amplifierT-R relay
keying output, capable of keying up to +200VDC
@ 5A.
REF IN (SMA): Input for external standard
frequency reference (KREF3-EXT option).
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