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 KAT3A ATU option,
which includes an antenna switch controlled from
the front panel. Both jacks are nominally 50 ohms
when the ATU is bypassed. AUX RF (BNC) is for
use with the KRX3A option; see pg. 39 and pg. 43.
ANT3 (BNC, on the KPA3A option panel) is the
antenna jack for the optional K144XV 2-m module.
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 1.0 A
(switched) for use with accessory devices.
Ground Terminal: A good station ground is
important for safety and to minimize local RFI.
KPA3A: This option panel is blank in the K3S/10
except for ANT3 (see above). In the K3S/100, the
blank panel is replaced with the fan panel shown,
which includes a circuit breaker.
KIO3B (pg. 19): Provides computer, auxiliary
control, and audio connections. The USB
connector handles both digitized line-level audio
and data (pg. 18). The RS232/P3 jack (RJ45) is
used with the P3 and/or for RS232 station control;
an RJ45-DE9 adapter is included (pg. 19).
KXV3B: Provides a variety of RF I/O signals,
including receive antenna in/out (pg. 41),
transverter in/out (pg. 41), a buffered I.F. output for
use with the Elecraft P3 (pg. 47), and internal I.F.
connections for the K144XV 2-m module. Preamp
2, for weak-signal work on 12/10/6 m, is also
included on this module (see pgs. 25 and 45).
External preamps such as the PR6-10 are not
needed with the K3S. See Preamp 2 (pg. 25).
Keying: PADDLE (1/4” jack) is the keyer paddle
input (see CONFIG:CW PDL). KEY (1/4” jack)
can be used with a hand key, external keyer,
computer, or other device. PTT IN (RCA/Phono) is
for use with a footswitch, etc. KEY OUT (RCA/
Phono) is the amplifier T-R relay keying output,
capable of keying up to +200VDC @ 5A.
REF IN (SMA): External 10-MHz reference input
for use with the K3EXREF option module (see
CONFIG:REF CAL and CONFIG:XVn OFS).
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