Icom IC-720A Instruction Manual page 12

When the RIT is ON the RIT INDICATOR will light. (Note:
The RIT will also pulse OFF when the TUNING CONTROL
knob is turned.)
28. AGC (AUTOMATIC GAIN CONTROL) SWITCH
For changing the time-constant of the AGC circuit. With
the switch in the AGC position (out) the AGC voltage is
released slowly, and thus is suitable for SSB reception.
With the switch in the FAST fin) position, the AGC voltage
is released faster, and the AGC is suitable for stations suffer-
ing from fast fading or when operating in the CW mode.
29. NB (NOISE BLANKER) SWITCH
When pulse type noise such as automobile ignition noise is
present, set this switch to the ON (in) position. The noise
will be reduced to provide comfortable reception.
30. ATT (ATTENUATOR) SWITCH
When nearby signals interfere with reception, or make "5"
readings difficult push the switch in, this removes the RF
Amplifier from the receiving circuit, and an attenuator is
put into the circuit. For normal operation leave it in the
OFF (out) position.
31. METER SELECT SWITCH
Selects meter function in the transmit mode.
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35. 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.
36. FREQUENCY SET CONTROL
This control is for fine adjustment of the reference fre-
quency of the PLL unit, which is local oscillator frequency.
Do not turn it unless you want to change the frequency.
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32. SIMPLEX/DUPLEX (TRANSCEIVE/SPLIT) SWITCH
Selects the relationship of the two МЕО. In the SIMPLEX
(out) position, one VFO is for both transmit and receive.
In the DUPLEX (іп) position, one VFO is for transmit and
the other is for receive.
33. HAM BAND/GENERAL COVER SELECT SWITCH
Selects the function of the set. In the HAM (out) position
the transceiver functions in any of nine HAM bands between
1.8MHz and 28MHz. In the GENERAL COVER position
(in) the set functions as a general coverage receiver between
0.1MHz and 30MHz. (the set will not transmit in this
mode.)
34. BAND UP/DOWN SWITCHES
Changes the operating band upward or downward. In the
HAM BAND operation, the band skips to the next upper or
lower band with each push. (28MHz band is divided into
two segments of 28-29MHz and 29-30MHz.)
In the GENERAL COVERAGE operation, the band changes
to next upper or lower 1MHz segment. When the band
reaches the highest band, the next is the lowest band. Also
when the band reaches the lowest band, the next is the
highest band.
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37. VOX DELAY (VOX time constant) CONTROL
This controls the transmit to receive switching time. Adjust
it so transmit to receive switching will not occur during
short pauses in normal speech.
38. SWR SWITCH
When measuring SWR, calibration SET and SWR reading
functions are selected with this switch. When reading SWR
make sure the METER SELECT switch on the front panel