SSB/AM/FM modes
VOX function (p. 8-2)
The VOX (Voice-Operated Transmission) function
switches between transmit and receive with your voice.
This function provides hands-free operation.
Push [VOX/BK-IN] to turn the VOX function ON or
OFF.
• “VOX” is displayed when the VOX function is ON.
Transmit monitor (p. 8-5)
The Monitor function allows you to monitor your trans-
mit signals.
Audio tone control (p. 15-4)
You can adjust the transmit voice characteristics (Bass
or Treble).
SSB mode
Speech compressor (p. 8-6)
The speech compressor increases average RF output
power, improving signal strength and readability.
Push the Multi-function [COMP]( ) key to turn the
Speech compressor ON or OFF.
Transmit lter width (p. 8-6)
Hold down the Multi-function [COMP]( ) key for 1
second to select the compression bandwidth be-
tween Wide, Mid, and Narrow.
CW mode
Break-in function (p. 8-4)
The break-in function is used to automatically toggle
the transceiver between transmit and receive when
keying. The IC-7851 is capable of full break-in or semi
break-in CW operation.
• Semi-break-in operation:
In the semi break-in mode, the transceiver transmits when
keying, then automatically returns to receive after a preset
time after you stop keying.
• Full break-in operation:
In the full break-in mode, the transceiver automatically
transmits while keying and returns to receive immediately
after you stop keying.
Push [VOX/BK-IN] several times to select the break-
in OFF, semi break-in or full break-in.
• “BK IN” or “F-BK IN” is displayed when the Semi break-in
or Full break-in function is ON.
SSB data/CW/RTTY/PSK modes
1
⁄4 function (p. 4-9)
When operating in the SSB data, CW, RTTY or PSK
mode, the 1⁄4 tuning function is selectable. When the
function is ON, the Dial speed is reduced to 1⁄4 of the
normal speed, for finer tuning control.
Push the Multi-function [1/4]( ) key to turn the
1
⁄4
function ON or OFF.
• “ ” is displayed when the function is ON.
CW/AM modes
Auto tuning function (p. 7-14)
Push [AUTO TUNE] to turn ON the Auto tuning func-
tion.
• When the CW mode is selected:
The transceiver automatically tunes the desired signal with-
in a ±500 Hz range.
• When the AM mode is selected:
The transceiver automatically tunes the desired signal with-
in a ±5 kHz range.
IMPORTANT!
When receiving a weak signal, or receiving a signal with in-
terference, the Automatic tuning function may not tune, or
may tune to an undesired signal.
Convenient functions for Transmit
Convenient functions for Receive (Continued)
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