Icom IC-701 Instruction Manual page 11

4-2 CONTROLS UNDER ACCESS COVER
@ DIM SWITCH
@RTTY SHIFT SWITCH
@ SWR SWITCH
6) CW MONITOR CONTROL
2 SWR SET CONTROL
@ FREQUENCY SET CONTROL
DIM GAIN CONTROL
28. DIM SWITCH
When this switch is set to DIM, the luminosity of the
frequency display and the meter automatically decreases
when the ambient level is reduced below a set level.
Therefore, under dim lighting such as at night, it decreases
the luminosity to a lower level for easy indicator reading.
When the switch is at the OFF position, the dimmer
function is disabled.
29. RTTY SHIFT SWITCH
This switch shifts transmit frequency and shift spacing.
Normally the shift is 170Hz, but in some cases 850Hz is
still used. Set the switch for the desired shift.
30. SWR SWITCH
When measuring SWR, calibration SET and SWR reading
functions are selected with this switch. Remember, at the
factory, the switch is in the SET position and fixed in
place with a plastic screw to prevent it from switching to
SWR. Remove the screw before attempting to read SWR!
SWR must be read only in the Po meter position.
31. CW MONITOR (MONI) 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.
32. SWR SET CONTROL
This control calibrates the meter needle to the Po SET
position when you want to determine the value of SWR.
The meter must be in the Po position and the set must be
transmitting a carrier.
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6) VOX DELAY CONTROL
8 ANTI VOX CONTROL
6) CW DELAY CONTROL
6) VOX GAIN CONTROL
33. FREQUENCY SET CONTROL
This control is for fine adjustment of the VXO section
frequency of the PLL unit, which is the local oscillator
frequency. Do not turn it unless you want to change the
frequency.
34. VOX GAIN CONTROL
This control adjusts input signal level via the microphone
to the VOX circuit. For VOX operation in SSB, adjust the
control so that the VOX circuit will operate with normal
speech.
35. CW DELAY (CW time delay constant) CONTROL
In Semi-break-in CW operation, this controls the TX/RX
switchover time delay. Adjust it to suit your keying speed.
36. ANTI VOX CONTROL
In VOX (SSB) operation, the VOX circuit may be operated
by sound from the speaker causing a switch to transmit.
This trouble can be prevented by adjusting the input level
of the ANTI VOX circuit with this contro! along with the
VOX gain control so that the VOX circuit only operates
from the operator's voice, not by sound from the speaker.
37. VOX DELAY (VOX time constant) CONTROL
This controls the TX to RX switching time. Adjust it so
TX to RX switching will not occur during short pauses in
normal speech.
38. DIM GAIN (dimmer circuit) CONTROL
The threshold for the functioning of the dimmer circuit
can be adjusted by turning the DIM GAIN CONTROL.
Turning the control counter-clockwise will lower the
operation threshold of the circuit.
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