ICOM ic-m801gmdss Benutzerhandbuch
11
4
RECEIVE AND TRANSMIT
4
■ Functions for receive
D
D 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.
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.
should be turned OFF.
➥Push [F] then [2
SQL
] to switch the function ON
and OFF.
• See page 45 for the squelch level adjustment.
• “SQL” appears when the squelch function is turned ON.
[2
SQL
]
[F]
D
D Noise blanker
The noise blanker function reduces pulse type noise
such as that coming from engine ignitions, etc.
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.
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 45 for the noise blanker level adjustment.
• “NB” appears when the NB function is turned ON.
[1
NB
]
[F]
D
D 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.
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.
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.
A G C
[5
AGC
×
]
[F]
D
D 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.
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.
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.
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.
• S-meter shows the minimum permitted level.
e Push any key to exit the RF gain set mode.