West Marine VHF650 User manual


Making a Distress Call
Lift the red cover. Press and hold the
DISTRESS button for three seconds. The
VHF650 transmits your boat’s location
every few minutes until you receive a
response.
NOTE: If the radio displays Enter User
MMSI, cancel the automatic distress call
and make a normal voice distress call.
L
ift the red cover
and press the
DISTRESS
button.
Making a voice distress call
Speak slowly -- clearly -- calmly.
Make sure your radio is on.
On the microphone, press the 16/9-TRI button to switch to Channel 16
(156.8 MHz). (If the corner of the display does not show 16, press the
16/9-TRI button again until it does.)
Press the PUSH TO TALK button on the microphone and say: "MAYDAY
--MAYDAY-- MAYDAY."
Say "THIS IS ___________ ÅWrite your boat’s name in the blank space
Say "MAYDAY ___________ ÅWrite your boat’s name in the blank
space.
Tell where you are: (what navigational aids or landmarks are near, or
read the latitude and longitude from your GPS).
State the nature of your distress, e.g. are you sinking, medical
HPHUJHQF\PDQRYHUERDUGRQ¿UHDGULIWHWF
Give number of persons aboard and conditions of any injured persons.
Estimate present seaworthiness of your ship, e.g. how immediate is the
GDQJHUGXHWRÀRRGLQJRU¿UHRUSUR[LPLW\WRVKRUH
%ULHÀ\GHVFULEH\RXUVKLSOHQJWKW\SHFRORUKXOO
Say: “I will be listening on Channel 16."
End message by saying "THIS IS ___________, OVER." ÅWrite your
boat’s name or call sign in the blank space.
Release the PUSH TO TALK button and listen. If you do not get an answer
after 30 seconds, repeat your call, beginning at step 3, above.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Making a Distress Call

E-2
Table of Contents
Making a Distress Call .................i
Making a voice distress call ........ i
Table of Contents .........................2
Introduction...................................4
Features .....................................4
Manual overview ........................4
Conventions ............................4
Terms used in this manual.......4
Getting Started..............................6
What's included ............................. 6
Parts of the radio ........................... 7
Turning on the radio..................... 10
Setting the UIC channel mode
(USA/CAN/INT) ........................... 10
How it Works...............................10
Normal mode operation............ 11
Using the radio in normal
mode .....................................12
Normal mode with Weather
Alert Watch ............................12
Normal mode with Triple and
Dual Watch ............................13
Normal mode with both Weather
Alert and Triple/Dual Watch...13
Scan mode ...............................14
Using the radio in scan
mode .....................................14
Scan mode with Weather Alert
Watch ....................................15
Scan mode with Triple and Dual
Watch ....................................15
Scan mode with both Weather
Alert and Triple/Dual Watch...16
Weather mode..........................16
Using the radio in weather
mode .....................................16
Weather mode with Weather
Alert Watch ............................17
Weather mode with Triple and
Dual Watch ............................17
Using Your Radio........................18
Making a voice MAYDAY
call............................................19
Setting the volume ...................19
Setting the squelch level ..........19
Changing the channel ..............20
Making a transmission .............20
Boosting the transmission
power.....................................20
Choosing Triple Watch or Dual
Watch .......................................21
Using FIPS codes for weather
alerts ........................................21
Changing display and sound
options......................................23
Contrast.................................20
Lamp adjust...........................20
Turning the key beep on and
off ..........................................20
Setting the GPS position
manually...................................23
Using Digital Selective Calling
(DSC) Features............................25
What is DSC?...........................25
Advanced DSC features...........25
Getting an MMSI number .........26
Entering MMSI numbers ..........26
Individual or user MMSI
number ..................................26
Group MMSI number.............27
Using the directory ...................28
Making DSC calls.....................30
Calling a single station
(Individual Call)......................31
Calling a particular group of
stations (Group Call) .............32
Calling all stations (All-Ships
Call) .........................................32
Making an automatic distress
call............................................33
Canceling an automatic
distress call............................33
Receiving a DSC call ...............34
Receive log ..............................34
Returning a call .....................35
Requesting another station's
position (POS Request) ...........35
Receiving a position request
(Position Reply)........................36
Enabling automatic position
reply.......................................36
Sending your own position
(Position Send)..........................37
Putting the radio into standby....37
Disabling automatic channel
switching....................................38
Renaming Channels...................39
Table of Contents

E-3
Table of Contents (Cont'd)
List of Tables
Table 1 - Terms used in this
manual............................................5
Table 2 - Rear panel.......................7
Table 3 - Front panel ......................8
Table 4 - Microphone button
connector........................................9
Table 5 - Normal mode status
messages .....................................12
Table 6&KDUDFWHUDQGWH[WHQWU\
order .............................................29
Table 7 - Receive log ...................35
Table 8 - Common GPS receiver and
connections ..................................45
Table 9 - Radio specifications ......54
Table 10 - Channel by type of
message.......................................56
Table 11 - USA Channel Frequencies
and Channel Tag ..........................57
Table 12 - Canadian Channel
Frequencies and Channel Tag......59
Table 13 - International Channel
Frequencies and Channel Tag......61
Table 14 - Weather Channel
Frequencies and Channel Tag......63
Table 15 - CEA2009-S.A.M.E.
EVENT CODE ..............................63
Table 16 - NMEA Input .................66
Installing the Hardware..............40
Mounting the radio ...................40
Connecting the radio ................42
Connecting accessories ...........44
Connecting to a GPS
receiver..................................44
Configuring the GPS .............46
Connecting to a charplotter ...47
&RQQHFWLQJWRDQH[WHUQDO
speaker..................................47
&RQQHFWLQJWRDQH[WHUQDO3$
speaker..................................48
Using the PA feature..............49
Maintenance and
Troubleshooting .........................50
Common questions ..................... 51
Engine Noise Suppression.......... 53
Maritime radio services
operation ..................................53
Basic radio guidelines ..............53
Specifications.............................54
Channel by type of message ...... 56
Channel and frequencies ............ 57
Alert codes and event levels ....... 63
NMEA Operation ......................... 66
NMEA Input............................... 66
NMEA Output............................ 66
Regulations and Safety Warnings67
FCC and Industry Canada
information ...............................67
Lead warning............................67
Antenna Selection and
Installation ................................67
Three Year Limited Warranty.....68
Mounting Bracket Driling
Template......................................69

E-4
Introduction
Features
Submersible Design
Complies with JIS7 water-resistant standards, which means the radio can
be submerged in 1 meter of water for 30 minutes without damage.
Large, dot matrix display
Advanced DSC Class D functions
Built-in PA feature
Channel select buttons on the microphone
Memory scan mode
Lets you save channels to memory and monitor them in quick succession.
Transmitter Power Level Select
Lets you boost the transmitter power from 1 watt to 25 watts for added
transmission distance.
Battery level display and tone
Sounds an alert tone if the battery voltage goes too high or too low.
Triple Watch Operation
Checks the Coast Guard Distress/Hailing channels 16 and 9 in the
background.
All marine VHF channels for the U.S., Canada, and international
waters
National Oceanic and Atmospheric Administration (NOAA) weather
channel watch
Sounds a warning tone when a hazard alert is issued for your area.
•
•
•
•
•
•
•
•
•
•
•
Manual overview
Conventions
This manual uses several different type styles to help you distinguish
between different parts of the radio:
•BOLD SMALL CAPITALS indicates an actual button or knob on the radio
or microphone.
•Upper and Lower case bold indicates a connector or label on the
radio.
•ItalicsLQGLFDWHWH[WRQWKHGLVSOD\VXFKDVPHQXRSWLRQVSURPSWV
DQGFRQ¿UPDWLRQPHVVDJHV
Introduction

E-5
Introduction
DSC Digital Selective Calling. A VHF radio standard for
communicating among boats and sending automated
distress calls.
FIPS Federal Information Processing Standard. A set of
location codes roughly equivalent to your county
codes.
WX Weather radio
GPS Global Positioning System
NMEA National Marine Electronics Association. The
organization that governs standards for electronic
equipment used on boats. NMEA 0183 is the standard
for serial data communication used by GPS receivers.
MMSI Maritime Mobile Service Identity number. A unique,
QLQHGLJLWQXPEHUWKDWLGHQWL¿HV\RXDQG\RXUERDW
when making DSC calls. It is also used by the Coast
Guard if you send an automated distress call.
Station Any DSC radio, whether it’s operated on a boat, at a
marina, or by a shore station.
Table 1 - Terms used in the manual

Getting Started
E-6
What's included
VHF650 Radio
DC Power Cable Accessory Cable
Mounting Bracket and
knobs Mounting Hardware
Microphone Hanger Spare Fuse 250V 6A
Getting Started

E-7
Getting Started
Parts of the radio
13.8V DC
ANTENNA
Antenna
connector
(SO238) Heat sink
Power
connector
Accessory
connector
Table 2 - Rear panel connector functions
Connector Connects to For details, see
Antenna connector ([WHUQDO9+)DQWHQQDZLWK
a male PL259 (SO238)
FRQQHFWRUDQG
impedance.
Minimum 4 ft, 3dB rated
antenna for sailboats, 8 ft, 6
dB rated for power boats.
Connecting the radio,
page 42.
Power connector Nominal 13.8 VDC power
supply with negative ground
(11.7 VDC to 14.3 VDC)
(Red wire +, black wire -).
Connecting the radio,
page 42.
Accessory connector GPS receiver, GPS
FKDUWSORWWHUH[WHUQDOVSHDNHU
H[WHUQDO3$VSHDNHU
Connecting accessories,
page 44.

Getting Started
E-8
07A
1 Watt USA
Memory
Scanning Channels
01A,03A,05A,06,07A,08
LCD
display
SELECT
/
1W/25W
button
CHANNEL UP
&
DOWN
buttons
VOLUME
-
PWR
(power) knob
(turn clockwise
to increase
volume)
Microphone
cord
16/9-
TRI
(triple/
dual-watch)
button
WX
-
ALERT
(weather)
button
SCAN
-
MEM
(channel
memory)
button
MENU
-
PA
(public
address)
button
DISTRESS
button
SQUELCH
knob
(turn clockwise
to decrease
channel noise)
Button Press to... Press and hold to...
SELECT-1W/25W Choose an option on a menu. Change the transmit
power (see page 20).
CHANNEL UP Move up one channel at a time. Move quickly up the
channels.
CHANNEL DOWN Move down one channel at a time. Move quickly down the
channels.
16/9-TRI 1st press: Go to Channel 16.
2nd press: Go to Channel 9.
3rd press: Go back to the original
channel.
Go into Triple Watch or
Dual Watch mode (see
page 13).
DISTRESS Select the nature of your distress
for a distress call.
Transmit a distress call.
Table 3 - Front panel button functions

E-9
Getting Started
Button Press to... Press and hold to...
WX-ALERT Listen to the current weather
conditions in your area.
Monitor the weather
channels for alerts in any
area.
MENU-PA Display the radio menu. Use the public address
(PA) function.
SCAN-MEM Start scanning the channels saved
in memory.
Save a channel into
memory or remove a
channel from memory.
PUSH -
TO-TALK
but
ton
16/9 TRI
(Triple /Dual-
Watch) button
+(plus) button
(move upa channel)
-(minus) button
(move down a channel)
Table 4 - Microphone button functions
Button Press to... Press and hold to...
+ Move up one channel at a time. Move quickly up the
channels.
- Move down one channel at a time. Move quickly down the
channels.
16/9-TRI 1st press: Go to Channel 16.
2nd press: Go to Channel 9.
3rd press: Go back to the original
channel.
Go into Triple Watch or
Dual Watch mode (see
page 13).
PUSH TO TALK Cancel scanning and stay on a
channel.
Talk on a channel.

Getting Started
E-10
Turning on the radio
Turn the VOLUME-PWR knob clockwise to turn on the radio. As it powers on,
the radio displays the user MMSI number; if there is no MMSI set, the radio
displays MMSI not entered.
When it powers on, the radio selects the last channel used.
Setting the UIC channel mode (USA/CAN/INT)
The radio comes preset to use the UIC channels assigned for the United
States. If you are operating in an area that uses Canadian or international
UIC channels, you will need to change the channel mode.
Press the MENU-PA button to display the menu, and choose the Setup
sub-menu.
Select USA/CAN/INT. The screen displays the UIC channel setup.
Highlight the channel mode you want to use: US (USA mode),
Canadian (Canada mode), or international (Intl mode).
Press the SELECT-1W/25W button. The radio activates the new channel
PRGHDQGH[LWVWKHPHQX
1.
2.
3.
4.
How It Works
The VHF650 has three basic modes of operation:
Operation mode What it does: Use it when: To turn it on/off:
Normal mode Monitors a single
marine radio
channel and lets
you talk on that
channel.
You want to talk to
another station on a
VSHFL¿FFKDQQHO
(default mode)
Scan mode Monitors all the
channels you save
into memory.
You have a small
group of channels
you use most often
and want to check
WKHPIRUWUDI¿F
Press the SCAN-
MEM button.
Weather mode Monitors the
selected NOAA
weather channel.
You want to hear
the current and
forecasted weather
in your area.
Press the WX-
ALERT button.

E-11
Getting Started
In addition to the three main operation modes, the VHF650 also provides
three different “watch” modes which you can activate during any of the three
EDVLFPRGHV,QWKHZDWFKPRGHVWKHUDGLREULHÀ\FKHFNVIRUDFWLYLW\RQD
VSHFL¿FFKDQQHOWKHQUHWXUQVWRLWVSUHYLRXVPRGH
Watch mode What it does: Use it when: To turn it on/off:
Weather Alert
Watch
Checks for alerts
on the last weather
channel you
used every seven
seconds.
You want to be
made aware of
severe weather
conditions in your
area.
Press and hold the
WX-ALERT button
for two seconds.
Triple Watch Checks for activity
on channels 16
and 9 every two
seconds.
You want to monitor
a channel yet
maintain a watch on
channels 16 and 9.
Press and hold the
16/9-TRI button for
two seconds.
Dual Watch Checks for activity
on channel 16 every
two seconds.
You want to monitor
a channel yet
maintain a watch on
channel 16.
Change Triple
Watch to Dual
Watch in the setup
menu, then press
and hold the 16/9-
TRI button for two
seconds.
NOTE: You are required to monitor channel 16 whenever your boat is under-
way. You should have either Triple Watch or Dual Watch on at all times.
Normal mode operation
Normal mode monitors whatever channel you select, and you can transmit on
that channel also.
While using normal mode, the display lets you see the following information
(not all indicators will display at the same time):
25
Marine Operator
25 Watts USA
Memory Alert
GPS Data OK
Transmit power
(1 Wor 25W)
Current channel
is storedin
memory
S
tatus messages
(see the status
message table )
Current
channel
number
Current channel
name (ifthe name
is too long,the
name line scrolls)
Channelmode
(USA,CANadian,
or INTernational)
Weather Alert
Watchon

Getting Started
E-12
Table 5 - Normal mode status messages
Message Meaning
GPS Data OK The radio is receiving valid GPS data.
Check GPS The radio is not receiving valid GPS data: check the GPS status screen and
the GPS connection.
Input Position The radio has been unable to receive valid GPS data for at least four hours;
it can no longer track your position. You need to manually input your position
(see Setting the GPS position manually on page 24).
Battery Low The battery voltage output is too low (below 11.2 VDC).
Battery High The battery voltage output is too high (above 14.8 VDC).
Triple Watch Triple Watch is turned on.
Dual Watch Dual Watch is turned on.
Using the radio in normal mode
• To transmit, press and hold the PUSH TO TALK button on the
PLFURSKRQH5HOHDVHWKHEXWWRQZKHQ\RXDUH¿QLVKHGWDONLQJ
• For the best sound quality, hold the microphone about two inches from
your mouth while you’re talking.
• Press the CHANNEL UP button on the radio or the + button on the
microphone to move up one channel at a time. Press and hold either
button to scroll quickly up the channels.
• Press the CHANNEL DOWN button on the radio or the - button on the
microphone to move down one channel at a time. Press and hold
either button to scroll quickly down the channels.
• To change the transmit power, press and hold the SELECT-1W/25W
button for two seconds. The transmit power switches between 1 watt
and 25 watts each time you press and hold the SELECT-1W/25W button.
Normal mode with Weather Alert Watch
If you activate Weather Alert Watch
while operating in normal mode,
the radio checks the most recently-
used weather channel every seven
seconds. If it detects a weather
alert for your area, it will change the
channel to the last-used weather
channel. The radio will not check
the weather channel while you are actively transmitting; it waits until your
WUDQVPLVVLRQLV¿QLVKHGDQGWKHQFKHFNVWKHZHDWKHUFKDQQHO
Every 7 seconds, the
radio checks the most
recently-used weather
channel. with WX
Alert on

E-13
Getting Started
Press and hold the WX-ALERT button for two seconds to turn Weather Alert
Watch on or off.
09 16 09 16 09 16
Every 2 seconds,the radio
checks channels 9&16.
with Triple Watch on
Monitoring Channel 25
Normal mode with both Weather Alert and Triple/Dual Watch
wx
Every 7seconds,
the radio checks the
most recently-used
weather channel.
with WX Alert on
09 16 09 16 09 16
Every 2 seconds,the radio
checks channels 9&16.
with Triple Watch on
Monitoring Channel 25
Press and hold the 16/9-TRI button (on the radio or the microphone) for two
seconds to turn Triple/Dual Watch on or off. (To change between Triple or
Dual Watch, see page 21.)
Normal mode with Triple and Dual Watch
If you activate Triple Watch while operating in normal mode, the radio checks
channels 16 and 9 every two seconds; with Dual Watch turned on, the radio
only checks channel 16. The radio will not check channels 16 or 9 while you
DUHDFWLYHO\WUDQVPLWWLQJLWZDLWVXQWLO\RXUWUDQVPLVVLRQLV¿QLVKHGDQGWKHQ
checks the channels.
You can activate Weather
Alert Watch and Triple/
Dual Watch at the same
time. The radio performs
both checks at their
scheduled time:

Getting Started
E-14
Scan mode
You can save channels into memory and then use scan mode to monitor
those channels. When the radio detects a signal on a channel, it pauses on
that channel as long as the signal is received; when the transmission stops,
the radio will continue scanning.
11
10
0
8 1312 17
15 20
14
The radio scans about
5channels in 1 second.
When it detects a signal,the radio stays on the
channeluntilyoupress the
CHANNEL UP
button or the
signalstops.
Resume scan
In scan mode, you can get the following information from the display (some
indicators will not always be displayed):
1 Watt USA
Memory
Scanning Channels
01A,03A,05A,06,07A,08
07
T
ransmit power
last used
Channelmode
(USA,CANadian,
or INTernational)
Current
channelbeing
scanned
Scan list (ifthe
text is too long,
the line scrolls)
Allscanned
channels must
be in memory
Normalscan
mode or Triple /
Dual-watchon
Using the radio in scan mode
You cannot transmit while in scan mode.
You must have two or more channels in memory to start a scan.
To save a channel into memory, select the channel, then press and
hold the SCAN-MEM button for two seconds. Memory will show on the
display.
•
•
•

E-15
Getting Started
To remove a channel from memory, set the radio to that channel, then
press and hold the SCAN-MEM button for two seconds. Memory will no
longer show on the display.
To activate scan mode, press the SCAN-MEM button. Press the SCAN-
MEM button again to return to the previous mode.
When the radio automatically stops on a channel, press the CHANNEL
UP button to leave that channel and resume scanning.
To end the scan, press the microphone PUSH TO TALK button or the
SCAN-MEM button. The radio remains on the last scanned channel.
•
•
•
•
If you activate Weather Alert
Watch while operating in scan
mode, the radio checks the most
recently-used weather channel
every seven seconds, then
FRQWLQXHVVFDQQLQJWKHQH[W
channel in memory:
Press and hold the WX-ALERT button for two
seconds to turn Weather Alert Watch on or
off.
Scan mode with Triple and Dual Watch
If you activate Triple Watch while
operating in scan mode, the radio
checks channels 16 and 9 every
two seconds, then goes on to
VFDQWKHQH[WFKDQQHOZLWK'XDO
Watch turned on, the radio only
checks channel 16:
09 16
E
very 2 seconds,
the radio checks
channels 9&16
then goes on to
t
he next channel.
with Triple Watch on
Memory Channel Scan
08 252417151413121110 20
Press and hold the 16/9-TRI button (on
the radio or the microphone) for two
seconds to turn Triple/Dual Watch on or
off. (To change between Triple or Dual
Watch, see page 21.)
Scan mode with Weather Alert Watch

Getting Started
E-16
Scan mode with both Weather Alert and Triple/Dual Watch
You can activate Weather Alert Watch and Triple/Dual Watch at the same
time. The radio performs both checks at their scheduled time:
09 16
E
very 2 seconds,
the radio checks
channels 9&16
then goes on to
t
he next channel.
with Triple Watch on
Every 7seconds,
the radio checks
the last-used
weather channel,
then scans the
next channel.
wx
with WX Alert on
Memory Channel Scan
08 252417151413121110 20
Weather mode
In cooperation with the FCC, NOAA also uses the weather channels to
alert you of other hazards besides weather (child abduction alerts, nuclear,
biological, etc.). In weather mode, the radio monitors one of the ten NOAA
weather channels. If any type of alert is received for your area, the radio
sounds an alert tone and displays the type of alert. In weather mode, the
display shows the following:
09
Hurricane Warning
Weather Band
Alert
Weather
mode is on Current
channel
number
Type ofalert (ifthe
text is too long,the
line scrolls)
Fla
shing:An alert
has been issued
Steady:Weather
Alert Watchis on
Using the radio in weather mode
You cannot transmit while in weather mode.
To enter weather mode, press the WX-ALERT button.
:HDWKHUPRGHFDQ¿OWHURXWDOHUWVWKDWGRQRWDIIHFW\RXUORFDWLRQLI
the location code (FIPS code) of the alert is entered in your radio (see
page 21). If you have no FIPS codes programmed into your radio, the
radio will notify you of all alerts in any area.
•
•
•

E-17
Getting Started
Weather mode with Weather Alert Watch
Because weather mode already monitors the weather channels, you don’t
need Weather Alert Watch to check the weather channel every seven
seconds. If you activate Weather Alert Watch while operating in weather
mode, it operates as a type of “sleep mode”: the radio stays on the weather
channel and mutes the speaker. If an alert is detected for your area, the
radio sounds an alert tone and turns the speaker back on. This mode is very
useful when you are anchoring for the night but want to stay informed of any
hazards in your area.
Press and hold the WX-ALERT button for two seconds to turn Weather Alert
Watch on or off.
Weather mode with Triple and Dual Watch
If you activate Triple Watch while operating in weather mode, the radio
checks channels 16 and 9 every two seconds; with Dual Watch turned on, the
radio only checks channel 16.
To turn off the radio’s alert tone, press any button.
To cancel weather mode and return to the previous marine channel,
press the WX-ALERT button again.
•
•
Press and hold the 16/9-TRI button (on the radio or the microphone) for two
seconds to turn Triple/Dual Watch on or off. (To change between Triple or
Dual Watch, see page 21.)
09 16 09 16 09 16
Every 2 seconds,the radio checks
channel9,then channel16
with Triple Watch on
MonitoringWeather Channel WX08

Using Your Radio
E-18
Individual
Group
All Ships
POS Request
Position Send
Directory
Standby
Receive Log
Exit
USA/CAN/INT
Dual/TriWatch
GPS Setup
FIPS
Auto CH SW
POS Reply
Channel Name
Group MMSI
User MMSI
Exit
Contrast
Lamp Adjust
Key Beep
Exit
MENU DSC Call SELECT
Setup SELECT
System SELECT
(Close Menu)
Exit SELECT
Using Your Radio
To display the radio menu, press the MENU-PA button. The menu has the
following options:

E-19
Using Your Radio
7KHFXUUHQWO\VHOHFWHGLWHPLVKLJKOLJKWHGLQUHYHUVHGRXWWH[W
Press the CHANNEL UP button on the radio or the + button on the micro-
phone to move up a line in the menu; if you are at the top line in the
menu, the cursor jumps to the bottom of the menu.
Press the SELECT-1W/25W button to choose the selected item.
Press the CHANNEL DOWN button on the radio or the - button on the
microphone to move down a line in the menu; if you are at the bottom
line of the menu, the cursor jumps to the top of the menu.
Press the MENU-PA button to go back to the previous menu screen.
From any menu screen, choose Exit or press the 16/9-TRI button to
close the menu screen.
•
•
•
•
•
•
Making a voice MAYDAY call
(see inside front cover)
Turn the volume knob clockwise to increase the speaker volume; turn it
counter-clockwise to decrease the volume.
Setting the volume
Setting the squelch level
7KHVTXHOFKIHDWXUHUHGXFHVWKHOHYHORIVWDWLFRQWKHVSHDNHUE\¿OWHULQJRXW
the background channel noise. At the lowest squelch level, the speaker plays
all radio signals, including any noise on the channel. Setting the squelch
OHYHOKLJKHU¿OWHUVRXWFKDQQHOQRLVHDQGOHWVRQO\DFWXDOUDGLRWUDQVPLVVLRQV
through.
Weak signals
No
Squelch Medium
Squelch High
Squelch
Strongsignals
Noise
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