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ER17, PA cannot be used on XVTR bands: Power levels above 10 W
cannot be used with external transverters.
ER18, KPA4 set to 'Not Installed' in menu: If a KPA4 amplifier module
is installed, set MENU:KPA4 PA Option to ENABLED. If not, then power
can not be set higher than 10 W.
ER20, Cannot turn off AGC when NR is in use: AGC must remain on
when noise reduction is in use in order to prevent excessive algorithm
gain.
ER21, Band data error: An internal check on per-band data structures
failed. Try turning power off and back on. If the problem persists, try
initializing parameters.
ER22, NR not allowed in DATA modes or if AGC is off: Noise
reduction and certain data modes cannot be used with AGC turned
off. Turn AGC on to proceed with the desired operation.
ER23, SPLIT would select a TX LPF too low for current RX band(s):
Cross-band SPLIT is only possible if (1) the receivers are using receive-
only antennas, or (2) the transmit band is higher in frequency than the
receive band.
ER24, VFO B Different Band menu entry is set to NO: By default, the
K4 makes sure that both VFOs are on the same band. If VFO B is to be
placed on a different band, set MENU:VFO B Different Band to YES.
ER25-ER40, KPA500 / KPA1500 error condition: If an Elecraft KPA-
series amplifier is connected to the K4, the transceiver can display
error conditions related to the amplifier. Please refer to the amplifier
manual for details.
ER41-ER50: Reserved for future use.
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