Icom IC-551D Instruction Manual page 16

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CW MONI (MONITOR) CONTROL |
This control adjusts the audio volume of the side tone (monitor) audio during CW transmit
operation. Adjust it to your desired level for easy listening. .
ANTI-VOX CONTROL
In VOX operation, the VOX circuit may be operated by sound from the speaker, causing a
switch to the transmit mode. This can be prevented by adjusting the input level of the
ANTI-VOX circuit with this control along with the VOX gain control so that the VOX circuit
operates only from the operator's voice, not by sound from the speaker.
SCAN SPEED CONTROL
This controls the scanning speed in Programmed Scan "A" and "B". Adjust the control to
desired scanning speed.
VOX GAIN CONTROL
This control adjusts the input signal level via the microphone to the VOX circuit. For VOX
operation, adjust the control so that the VOX circuit will operate with normal speech.
CW DELAY (CW TIME DELAY CONSTANT) CONTROL
In semi-break-in CW operation, this controls the transmit/receive switch-over time delay.
Adjust it to suit your keying speed.
VOX DELAY (VOX TIME CONSTANT) CONTROL
This controls the transmit-to-receive switching time. Adjust it so switching will not occur
during short pauses in normal speech.
. FAN SWITCH
This switches the function of cooling fan in the PA unit. In the "ҒАМ" position, the fan
turns in the transmit mode only. In the "R-ON" position, the fan turns in either the transmit
mode or the receive mode.