55
§ VFO A frequency doesn’t change: You may have the VFO locked. Tap RATE to unlock.
§ VFO A frequency changes by itself: If using a mic other than the MH3, set MIC BTN to OFF.
Transmit
§ BND END: Indicates an attempt to transmit outside the ham bands.
§ TX LED on all the time: This could indicate that PTT is being held on by external equipment. Try
disconnecting everything connected to the left side panel except the power supply. VOX gain (VOX GN menu
entry) may be set too high.
§ HI CUR or HI SWR warning: Check supply voltage. If voltage is low and/or a low-impedance antenna
load is present, current can go up for a given requested power level. Reduce power if necessary. (The KX2 may
do this automatically. If this doesn’t reduce the current or reflected power to safe levels, the KX2 will drop out
of transmit mode.)
§ HI TEMP warning: PA heat sink temperature has exceeded the safe operating limit. Use DISP to check
power supply voltage, current drain, and PA temperature. Allow heat sink to cool. Reduce power if necessary.
(The KX2 may automatically reduce power, drop out of transmit mode, or turn itself off.)
§ KX2’s right side panel is hot to the touch: The right side is used as a heat sink, so it it normal for it to feel
quite warm during long transmissions. The panel will run cooler if you use shorter transmissions, lower power,
or a lower supply voltage. If operating in sunlight, try to orient the right side panel away from the sun.
§ An asterisk (*) appears in the PWR setting display (e.g. 5.0 W*): Transmit ALC has been turned off. To
turn it back on, go to MENU:TX GAIN , unlock the parameter by holding FREQ for 3 seconds, then tap ATU
This will turn off the (-) sign in front of ALC.
§ Can’t transmit in CW mode: (1) Make sure the key or keyer paddle is plugged into the correct jack. (2) To
transmit immediately upon hitting the key, you must have VOX-CW enabled (see MENU:VOX). If VOX is off
(PTT-CW), you must tap XMIT before sending; otherwise only a sidetone is generated . (3) You may be in
SPLIT mode, with VFO B set for a voice or data mode. Tap A/B to check VFO B’s mode.
§ Can’t use the mic in voice modes: You may be in SPLIT mode, with VFO B set for CW or data mode rather
than a voice mode. Tap A/B to check VFO B’s mode.
§ Low power output: You may also be working into a high-SWR load and/or using a low supply voltage. Also
try redoing Transmit Gain calibration (pg. 39). Note: Max power also varies per band.
§ Inadequate transmit carrier or opposite-sideband suppression: The voice- and audio-data carrier and
opposite sideband will typically be down 60 dB or more at 5 watts output. If either is significantly higher than
this level, the Transmit Carrier or Transmit Opposite Sideband calibration steps (pg. 40) can be performed.
These procedures require a spectrum analyzer and are normally done only at the factory.
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