70
or its LCD labels to select th
e other functions as needed: <PTCH>
(sidetone pitch), <PWR> (power out
put), or <DLY> (VOX delay).
• In voice modes, the upper knob functions change to <MIC> (mic
gain) and <CMP> (speech compression). Speech compression only
applies to SSB and ESSB modes. See "CESSB" elsewhere in this manual
for important information regarding average power increase with
compression on.
Transmit Status Indications
• Above the VFO A knob are the TX LED (indicating transmit mode),
and the delta-F LED (∆f), indicating that the receiver and transmitter
are not on the same frequency due to the use of RIT, XIT, or SPLIT.
• At the upper middle of the LCD screen is the "TX" VFO indicator, with
an arrow pointing to the VFO that is active for transmit. This will
change to "TX Inh" if the transmitter is being inhibited by an external
controller (see ACC jack, pin 7, TX Inhibit). It changes to "TX Test"
when TEST mode is in effect ([TEST] switch).
Advanced Transmit Features
• In some situations you may wish to transmit on VFO B's frequency
rather than VFO A's. To do this, use SPLIT mode. (Also see USING
SPLIT.) XIT (transmit incremental tuning) is also available; one use of
XIT is to temporarily move off-frequency to do ATU tuning (see RIT/XIT
and CLR).
• To use pre-recorded transmit messages, see CW Messages and DVR
Transmit Messages.
• The K4 provides an ESSB (extended single-sideband) mode for
operators who wish to use or experiment with higher-fidelity SSB.
Since ESSB increases transmit bandwidth, it should only be used when
the operator is certain they're not causing interference to other
stations. To turn ESSB on/off and adjust its bandwidth, tap <TX>, then
tap <ESSB>. When ESSB is on, you can tap <ESSB BW> to adjust the
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