• Speaker is not working with headphones unplugged: Locate the CONFIG:SPKR+PH menu entry. Tap
‘1’ on the numeric keypad until you see PH.R SW– . The minus sign (-) indicates inverted switch logic,
required for the jack on the KIO3B audio board.
• 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 filter configuration, including CONFIG:FLx BW, FLx GN, and FLx FRQ; (5)
verify that CONFIG:REF CAL is properly adjusted; (6) make sure RF GAIN is set to maximum.
• Spurious signals (“birdies”): All high-dynamic range receivers exhibit some birdies. Most will be
inaudible with an antenna connected. If you find a birdie that’s audible above normal band noise, see the
CONFIG:SIG RMV menu entry. Autonotch may be useful for removing birdies in voice modes.
• VFO tuning noise (“ticking”) on some bands, even with antenna connected: (1) Try VFO Tuning
Noise Reduction (see CONFIG:VCO MD). (2) Try using a very low setting of the DSP noise blanker.
(3) If you use the XREF IN setting of the CONFIG:REF CAL menu entry without a K3EXREF reference-
locking option installed, you may hear digital switching noise on the 6-m band. Set it to XREF OUT.
• Preamp 2 not available (N/A): (1) There are limitations on preamp 2 use with the sub receiver (pg. 45).
(2) Preamp 2 is only available on the 12/10/6-meter bands, and only when enabled on each of these bands
individually using CONFIG:PREAMP2. (3) If you see N/A flashed when attempting to use this menu
entry, and you are on 12, 10, or 6 meters, then the K3S has not recognized the correct RF board type. Try
turning power off/on. If the problem persists, contact Elecraft. (4) Make sure the CONFIG:KXV3B menu
entry name is KXV3B, not KXV3. Preamp 2 is only present on the KXV3B module. While in this menu
entry, tap 9 to change the menu entry name to KXV3B, then exit the menu and turn power off/on. If you
have the wrong type of KXV3 module, you will see ERR XV3 on power-up.
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