Icom IC-M804 Instruction Manual - Page 19

Other functions, Emergency FREQ channel, Noise Blanker function, Noise Blanker Level, Squelch function

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5 OTHER FUNCTIONS AND OPERATIONS ■ Other functions Emergency FREQ channel Select the Distress Voice Frequency. When this channel is selected, the Voice Frequency of a DSC call can be monitored without receiving or transmitting a DSC call. 1. Push [◄] or [►] until Emergency FREQ is displayed in the Software Key area. 2. Push Emergency FREQ . • The channel is changed to an Emergency FREQ channel and Emergency is displayed in the Channel area. 3. Rotate [CH/GRP] or push [▲] or [▼] to select a channel. Noise Blanker function The Noise Blanker function reduces pulse-type noises that come from engine ignitions. However, if the received strong signals are distorted, adjust the Noise Blanker level or turn OFF the function. 1. Push [◄] or [►] until NB is displayed in the Software Key area. 2. Push NB to turn the function ON or OFF.  When the function is ON, "NB" is displayed in the Status area. Noise Blanker Level When the Noise Blanker function is ON, adjust the Noise Blanker level to reduce various pulse-type noises. Set to between 1 and 10. 1. Push [◄] or [►] until NB Level is displayed in the Software Key area. 2. Push NB Level . • The NB level setting window is displayed. 3. Push or to adjust the Noise Blanker level. Squelch function The Squelch function mutes unwanted signals such as noise or unmodulated beat signals. This function enables quiet standby. However, if you need to receive weak signals, adjust the squelch level, or turn OFF the function. 1. Push [◄] or [►] until SQL is displayed in the Software Key area. 5 2. Push SQL to turn the function ON or OFF.  When the function is ON, "SQL" is displayed in the Status area. S-meter Squelch Level When the Squelch function is ON, only signals stronger than this set level are received. Set to between 0 (open) and 100 (tight). 1. Push [◄] or [►] until S-SQL Level is displayed in the Software Key area. 2. Push S-SQL Level . • The S-SQL level setting window is displayed. 3. Push or to adjust the squelch level. RF gain Level To receive weak signals, you can set the minimum RF (Radio Frequency) gain level needed. Set to between 0 and 9. 1. Push [◄] or [►] until RF Gain is displayed in the Software Key area. 2. Push RF Gain . • The RF gain level setting window is displayed. 3. Push or to adjust the RF gain level. Clarity Control function With the Clarity Control function, you can slightly shift the receive frequency without changing the operating transmit frequency to finely tune it. When the function is ON, adjust the receive frequency. Set to between -150 Hz and +150 Hz (in 10 Hz steps). 1. Push [◄] or [►] until Clarity is displayed in the Software Key area. 2. Push Clarity to turn the function ON. • is displayed in the Channel area. 3. Push [▲] or [▼] to adjust the receive frequency. ► Continued on the next page. 14

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14
OTHER FUNCTIONS AND OPERATIONS
5
5
■
Other functions
Emergency FREQ channel
Select the Distress Voice Frequency. When this
channel is selected, the Voice Frequency of a DSC
call can be monitored without receiving or transmitting
a DSC call.
1.
Push [◄] or [►] until
Emergency FREQ
is displayed
in the Software Key area.
2. Push
Emergency FREQ
.
•
The channel is changed to an Emergency FREQ
channel and
Emergency
is displayed in the Channel
area.
3.
Rotate [CH/GRP] or push [▲] or [▼] to select a
channel.
Noise Blanker function
The Noise Blanker function reduces pulse-type noises
that come from engine ignitions.
However, if the received strong signals are distorted,
adjust the Noise Blanker level or turn OFF the function.
1.
Push [◄] or [►] until
NB
is displayed in the
Software Key area.
2. Push
NB
to turn the function ON or OFF.
When the function is ON, “NB” is displayed in the
Status area.
Noise Blanker Level
When the Noise Blanker function is ON, adjust the
Noise Blanker level to reduce various pulse-type
noises.
Set to between 1 and 10.
1.
Push [◄] or [►] until
NB Level
is displayed in the
Software Key area.
2. Push
NB Level
.
•
The NB level setting window is displayed.
3.
Push [◄]/[▼] or [▲]/[►]
to adjust the Noise
Blanker level.
Squelch function
The Squelch function mutes unwanted signals such
as noise or unmodulated beat signals. This function
enables quiet standby.
However, if you need to receive weak signals, adjust
the squelch level, or turn OFF the function.
1.
Push [◄] or [►] until
SQL
is displayed in the
Software Key area.
2. Push
SQL
to turn the function ON or OFF.
When the function is ON, “SQL” is displayed in the
Status area.
S-meter Squelch Level
When the Squelch function is ON, only signals
stronger than this set level are received.
Set to between 0 (open) and 100 (tight).
1.
Push [◄] or [►] until
S-SQL Level
is displayed in
the Software Key area.
2. Push
S-SQL Level
.
•
The S-SQL level setting window is displayed.
3.
Push [◄]/[▼] or [▲]/[►] to adjust the squelch
level.
RF gain Level
To receive weak signals, you can set the minimum RF
(Radio Frequency) gain level needed.
Set to between 0 and 9.
1.
Push [◄] or [►] until
RF Gain
is displayed in the
Software Key area.
2. Push
RF Gain
.
•
The RF gain level setting window is displayed.
3.
Push [◄]/[▼] or [▲]/[►] to adjust the RF gain level.
Clarity Control function
With the Clarity Control function, you can slightly shift
the receive frequency without changing the operating
transmit frequency to finely tune it. When the function
is ON, adjust the receive frequency.
Set to between -150 Hz and +150 Hz (in 10 Hz steps).
1.
Push [◄] or [►] until
Clarity
is displayed in the
Software Key area.
2. Push
Clarity
to turn the function ON.
•
is displayed in the Channel area.
3.
Push [▲] or [▼] to adjust the receive frequency.
► Continued on the next page.