112
minimum value shown reflects hardware constraints.) Use the smallest
value that allows for clean switching of external equipment, typically a
linear amplifier with a slow T/R relay. Verify by listening on another
redeiver to the CW signal produced by your amp. Large values may
interact with CW timing at faster code speeds.
TX DLY, Unkey to Receive
Sets the delay time in milliseconds from KEY OUT going high (end of
external amp keying) to return to receive mode. This parameter is
intended to compensate for amplifier T/R switching on key-up, which can
cause audible receive artifacts such as "clicks" or "pops." This is especially
true when keying in the presence of multiple large received signals (e.g., in
a pileup).
Use the smallest value that eliminates audible receive artifacts on key-up.
Settings from 5-10 are sufficient for most amps. For the KPA1500, a delay
value of 5 ms is typically used. The best value can be determined
experimentally while keying the K4 in TEST mode, which keys the K4 and
the amplifier without producing RF output. This should be done while one
or more large signals are within +/- 5 kHz of the K4's VFO frequency.
(Lacking such signals, artifacts are not likely to be heard.)
NOTE: Settings from 0-15 are applied in such a way as to still allow for QSK
operation, though settings at the higher end of this range may interact
with CW timing. Settings from 16-60 will not affect CW timing even at the
highest code speeds, but they do not allow for full QSK, even when QSK
mode is selected.
TX Gain Cal
Per-band transmit gain calibration constant. To recalibrate the value for a
given band, set MENU:TX Gain Cal via TUNE to ON (see below), then do
[TUNE] at 5.0 and 50 W into a dummy load or into an antenna with an SWR
of < 2.0:1.
TX Gain Cal via TUNE
Set to ON to allow transmit gain recalibration at 5.0 and 50 W using the
[TUNE] switch. The recommended setting is OFF at other times in order
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