impedance. Allow heatsink to cool. Reduce power if necessary. Make sure the CONFIG:PA TEMP menu
entry is calibrated (allow heatsink to cool to room temperature, then compare menu readingto actual).
ALC OFF is displayed on VFO A during transmit: Set CONFIG:TX ALC to ON. ALC should only be
turnedoff during band-pass filter alignment (do not adjust filters without consulting Elecraft support).
Can’t transmit in CW mode: (1) Make sure the key or keyer paddle is plugged into the correct jack.
(2) You must have VOX selected (VOX icon on) in order to use hit-the-key CW. (3) Youmay be in SPLIT
mode, with VFO B set for a voice or data mode. Tap A/ B or use B SET to check VFO B’s mode.
Key clicks in QSKCW mode with an external amplifier:.Thismay be due to a slow amplifier relay (use
CONFIG:TX DLY) or incorrect application of external ALC (see CONFIG:EXT ALC and pg. 27).
Can’t use the mic in voice modes:You may be in SPLIT mode, with VFO B set for CW or data mode
ratherthan a voice mode. Tap A/B or use B SET to check VFO B’s mode.
No power output: You may have routed RF through the KXV3’s XVTR IN/OUT jacks, either by switching
to a transverter band, or by setting CONFIG:KXV3 to TEST. Another possibility isthat power hasnot been
calibrated on the present band (pg. 48).
Relay heard switching during keying: If this happens only above a certain power level, transmit signal
leakage may be activatingthe carrier-operated-relay circuitry on either the KXV3 module (RF I/O) or the
KRX3 (sub receiver). You must either improve isolation between transmit and receive antennas, or decrease
output power. If a relay switches during keying even at very low power levels, it could be due to: (1) SPLIT
operation with different bands and/or modes, or the receive VFO tuned outside any ham band; (2) VFO A is
tuned close to a point where a relay switches between transmit and receive due to incorrect VCO calibration
(re-run VCO CAL using the latest firmware, thentune acrossthe affected band in receive mode to make
sure no relay switching occurs).
Receive
HI RFI warning: A high-power transmitter may be coupling into the K3’s antenna in receive mode. The
warning occurs when the ANT1 or 2 input signal exceeds about 1to 2 W. You can disable the warning (set
CONFIG:RFI DET to OFF), but eliminating the over-coupling will ensure no damage to K3 components.
No receivedsignal: Possibilities include (1) receiver being squelched (if RF/SQL controls are assigned to
squelch via CONFIG:SQ MAIN or SQ SUB, rotate squelch controls fully counter-clockwise); (2) RF
GAIN too low (set RF gain controls fully clockwise); (3) filter bandwidth too narrow (set WIDTH ortap
XFIL, and also verify filter configuration settings); (4) switching to an open receive antenna onthe KXV3
(RX ANT IN); (5) switchingthe KAT3to an open antenna jack; (6) CONFIG:REF CAL parameter not
adjusted properly; (7) CONFIG:KXV3 may be set to TEST, which routes all RFthrough the XVTR
IN/OUT jacks.
Received signal level too low: (1) Try setting CONFIG:AF GAIN to HI; (2) check headphone and speaker
plugs and cables; (3) make sure that CONFIG:RX EQ settings are either flat or have not been set for a large
amount of cut; (4) recheck all filter configuration settings, particularly the CONFIG:FLx BW, FLx GN, and
FLx FRQ menu entries;(5) verifythat CONFIG:REF CAL is properly adjusted; (6) make sure RF GAIN is
set to maximum.
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