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a 2-tone signal for IMD measurement on a spectrum analyzer. The level of
the 2 tones is approximately 6 dB below the equivalent CW power output,
and is not subject to the MIC gain or compression settings. NOTE: At the
high end of the K4's power output range, it is possible that the peak
power shown on the bar graph may be slightly lower than the specified
target. This effect may vary with band, supply voltage, and load
impedance. It is due to the fact that all class AB amplifiers exhibit some
degree of gain compression at the high end of their power range. The K4
limits maximum drive to the final amplifier stage in order to ensure good
IMD performance and to remain within safe operating limits.
TX AUDIO lF Cutoff, SSB
Sets the nominal audio low-frequency cutoff point for regular SSB mode.
The default is 200 Hz. Selecting the 100 Hz setting may improve transmit
voice quality for some operators. With the 100 Hz setting, even the 50 Hz
TX EQ adjustment will be usable, although 50 Hz is still significantly
attenuated compared to 100 Hz.
NOTE 1: If you use USB or LSB for audio data modes that depend on fast
T/R turnaround, such as PACTOR, you should not use the 100 Hz SSB LF
cutoff setting, since it adds approximately 20 ms to turnaround time. (We
recommend using DATA mode for all data operation rather than USB or
LSB. If you can use DATA mode instead, then the 100 Hz SSB LF cutoff
setting can be used for voice.)
NOTE 2: A 100 Hz cutoff is always used in ESSB mode. In audio DATA
modes, a 200 Hz setting is always used.
TX ALC
Set to OFF to disable transmit ALC (automatic level control). Typically used
only for factory testing.
TX DLY, KEY Out to RF Out
Sets the total delay time from KEY OUT going low (or onset of external
amp keying) to the beginning of the driving RF waveform. (The
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