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transmit bandwidth setting for ESSB, which is independent of the
normal SSB bandwidth.
NOTE: In ESSB mode, the nominal low-frequency TX audio cutoff is
100 Hz. In regular SSB mode, the default is 200 Hz, but 100 Hz can be
selected (see MENU: TX Audio LF Cutoff, SSB).
• It is possible to transmit CW while in SSB modes. Refer to the CW TX
in SSB Mode menu entry.
TX AND RX METERING
Transmit Metering
During transmit, the power, SWR, ALC and compression bar graphs are
all shown simultaneously. TX bar graphs overlay the applicable S-meter
(in non-split mode, all TX meters appear beneath VFO A, while in split
they appear below VFO B). This combined with color-coding of the
meters makes split operation virtually foolproof.
Transmit parameters are also shown in the status area of the display
(see USING THE STATUS DISPLAY).
S-Meters and High-Signal Indications
Each receiver (main/VFO A, and sub/VFO B) has its own S-meter. The
K4's S-meters always read absolute signal value. This means that for a
signal at a given absolute amplitude at the antenna, the S-meter will
read the same value regardless of preamp or attenuator settings.
Calibration is done at S9 = 50 microvolts (-73 dBm). Each S-unit
represents 6 dB of signal change.
If the received signal level exceeds the usable dynamic range, the S-
meter's "+60" icon will briefly change to "OVF" and magenta. If this
happens frequently or continuously, you should manually reduce
receiver front end gain. The K4 can do this automatically, if desired;
see RX Auto Attenuation.
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