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4
RECEIVE AND TRANSMIT
4
Functions for receive
DD
Squelch function
The squelch function detects signals with voice com-
ponents and squelches (mutes) unwanted signals
such as unmodulated beat signals. This provides
quiet stand-by.
When you need to receive weak signals, the squelch
should be turned OFF.
Push [F] then [2
SQL
] to switch the function ON
and OFF.
See page 48 for the squelch level adjustment.
•“SQL appears when the squelch function is turned ON.
[2 SQL][F]
DD
Noise blanker
The noise blanker function reduces pulse type noise
such as that coming from engine ignitions, etc.
The noise blanker may distort reception of strong sig-
nals. In such cases, the noise blanker should be
turned OFF.
Push [F] then [1
NB
] to switch the function ON and
OFF.
See page 48 for the noise blanker level adjustment.
•“NB appears when the NB function is turned ON.
[1 NB][F]
DD
AGC OFF function
The receive gain is automatically adjusted according
to received signal strength with the AGC (Automatic
Gain Control) function to prevent distortion from
strong signals and to obtain a constant output level.
When receiving weak signals with adjacent strong
signals or noise, the AGC function may reduce the
sensitivity. In this situation, the AGC function should
be deactivated.
Push [F] then [5
AGC
××
] to switch the function ON
and OFF.
•“ appears when the AGC function is turned OFF.
AGC
[5 AGC
×
][F]
DD
RF gain setting
The receiver gain can be reduced with the RF gain
setting. This may help to remove undesired weak sig-
nals while monitoring strong signals.
Usually, the AGC function reduces the RF gain ac-
cording to the receive signal strength and these weak
signals are removed. However, during no signal re-
ception, these weak signals may not be heard.
In such cases, the RF gain may be useful for setting a
minimum level at which to hear signals.
q Push [F] then [6
RF
-
G
] to select the RF gain set
mode, as shown below.
w Rotate [CH] to set the desired minimum cutting
level.
0 (low sensitivity) to 9 (max. sensitivity) are available.
S-meter shows the minimum permitted level.
e Push any key to exit the RF gain set mode.
IC-M802_USA.qxd 02.7.9 10:58 Page 11
19


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