Icom IC-R7O Maintenance Manual page 5

SECTION 2 CONTROLS AND THEIR FUNCTIONS
2-1 FRONT PANEL
a S-METER
@) AGC-TIMING SWITCH
@ NB TIMING SWITCH
1) MONITOR CONTROL
@) NOISE BLANKER =)
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@ PHONES JACK.
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#) RECORDER JACK —
') PREAMP/ATT SWITCH
@ RF GAIN ne!
VFO EQUALIZATION SWITCH
@8 SQUELCH CONTROL
gi TONE CONTROL
id VFO SWITCH
a2 BAND UP/DOWN SWITCH
1. MONITOR CONTROL
When using this set together with a transmit-
ter or transceiver, actual transmitted signals
can be monitored.
This control switches the monitor circuit ON
and OFF, and controls its audio level. Use
headphones or reduce monitor audio volume
to prevent feedback to the transmitter mic-
rophone.
2. NB (NOISE BLANKER) SWITCH
When pulse-type noise such as automobile
ignition noise is present, press this switch in.
The noise will be reduced to provide comfort-
able reception.
3. NB TIMING SWITCH
The noise blanker blanking time can be
selected (NORMAL and WIDE) by this switch. It
will be effective against any type of noise.
4. AGC TIMING SWITCH
For changing the tirne-constant of the AGC
2-1
i) HAM BAND/GENERAL COVERAGE
SELECT SWITCH
@ DIMMER SWITCH
—_—_—_—_— i SIGNAL INDICATOR
é MUTE INDICATOR
@) FM TUNING INDICATOR
RIT
INDICATOR
@ MODE/FREQUENCY DISPLAY
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CONTROL
@& PB TUNE CONTROL
| L- NOTCH FILTER SWITCH
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| ed NOTCH FILTER
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dg} RIT SWITCH
@ RIT CONTROL
@® DIAL LOCK SWITCH
(Automatic Gain Control) circuit. By setting the
switch to the SLOW pasition, the AGC voltage
is released more slowly. Set the switch to
provide comfortable reception.
When the switch is in the OFF position, the
AGC function is switched OFF and the S-meter
does not move even if a signal has being
received. (The AGC does not actuate in the FM
mode.)
. MODE-SELECT SWITCHES
Select any one of five operating modes by
simply pressing the desired switch. Additional-
ly, the CW and SSB switches have dual func-
tions, as follows.
1. CW: For normal CW operation.
CW-N: By pressing the FUNCTION key
first and then the CW button, the
narrow CW filter is selected.
SSB-N: For normal SSB operation, upper
sideband (USB) for the 10-MHz
band and above, and lower side-