Uniden CMX660 User manual

© 2017 Uniden America Corporation U01UT418ZZZ(0)
Irving, Texas Printed in Vietnam
CMX660
PROFESSIONAL MOBILE CB RADIO
Owner’s Manual

CONTENTS
DESCRIPTION ...................................................... 5
WHAT’S IN THE BOX ........................................................... 7
CONTROLS AND CONNECTORS......................................... 8
Radio (Front and Back).....................................................8
Microphone.......................................................................9
INSTALLATION .................................................. 10
CONNECT POWER ............................................................ 10
Ground Information ......................................................11
Connect Power................................................................11
MARINE INSTALLATION .................................................. 12
CONNECT ANTENNA......................................................... 12
Safety Notice...................................................................13
INSTALL MICROPHONE HANGER/
CONNECT MICROPHONE ............................................... 14
Install Microphone Hanger............................................14
Connect Microphone......................................................14
Disconnect the Microphone ..........................................15
INSTALL RADIO BRACKET/INSTALL RADIO ................... 15
Attach Side Rails ............................................................15
Attach Bracket/Install Radio .........................................16
EMERGENCY OPERATION ................................ 17
USING YOUR CMX660....................................... 17
LCD DISPLAY ..................................................................... 17
BASIC OPERATIONS.......................................................... 19
Turn On/O.....................................................................19
Transmit/Receive............................................................20
Adjust Volume ................................................................20
Select Channel before Transmit/Receive .....................20

Adjust Squelch................................................................21
Automatic Noise Limiter (ANL/HI-CUT).........................21
Adjust Radio Sensitivity (LO/DX) ..................................22
CHANNEL SCAN................................................................. 23
WEATHER MODE WX MODE.......................................... 23
Set Weather Scan............................................................24
Set Weather Alert Mode.................................................25
MENU OPERATION............................................................ 25
Set Dimmer .....................................................................25
Set Key Beep ...................................................................26
Set Roger Beep ...............................................................27
Set Battery Check ...........................................................27
Set FLIP............................................................................28
PREVENTIVE MAINTENANCE .......................... 28
MAINTENANCE ................................................. 28
TROUBLESHOOTING ........................................ 29
SERVICING YOUR RADIO ................................. 30
SPECIFICATIONS ............................................... 31
FCC PART 15 & IC COMPLIANCE ...................... 34
FCC PART 15 COMPLIANCE.............................................. 34
IC COMPLIANCE ................................................................ 34
ONEYEAR LIMITED WARRANTY .................... 35
RADIO CODE DEFINITIONS ............................. 39

5
DESCRIPTION
Your Uniden CMX660 represents the highest
quality communications device designed for use
in the Citizens Band Radio Service. It will operate
on any of the 40 AM frequencies authorized by the
Federal Communications Commission (FCC).
The CMX660 is designed to provide years of
trouble-free service. Its slim profile can fit easily
under the seat to free up space in the vehicle’s
cabin. Its rugged components and materials are
capable of withstanding harsh environments.
Please read this Owner’s Manual carefully to
ensure you gain the optimum performance of the
unit.
The Citizens Band Radio Service is under the
jurisdiction of the Federal Communications
Commission (FCC). Any adjustments
or alterations which would alter the
performance of the radio’s original FCC
type acceptance, or which would change the
frequency determining method, are strictly
prohibited.

6
Replacement or substitution of crystal,
transistors, ICs, regulator diodes, or any
other part of a unique nature, with parts
other than those recommend by Uniden,
may cause violations of the technical
regulations in Part 95 of the FCC Rules or in
violation of type acceptance requirements in
Part 2 of the rules.
This is an FCC rule and applies to all CB radio
operators.
FEATURES
• 40 AM Channels • 7 Weather Channels
• Channel Monitor (SQL 0) • Weather Channel Scan
• Emergency Channel 9/19 • Weather Alert
• Channel Scan • Volume Control
• Squelch Control • High Cut
• Automatic Noise Limiter • Roger Beep
• Key Beep • Backlight Dimmer Control
• S/RF Meter • Battery Check
• Inverting display

7
WHAT’S IN THE BOX
CMX660 Radio Microphone Microphone
Hanger with
Hardware
Not Shown:
Printed
Materials
CMX660 Slide
Mount Bracket
with Hardware
CMX660 DC
Power Cord
with Fuse

8
CONTROLS AND CONNECTORS
Radio (Front and Back)
1
87
FRONT
BACK
6
4
2
5
3
NUMBER NAME
1 MIC Jack
2 LCD
3 Menu
4 VOL/SQ, POWER knob
5 Local/DX
6 External Speaker Jack
7 Power Cables
8 Antenna Connection

9
Microphone
1
2
3
4
5
6
7
NO. NAME
1 Microphone Hanger
2 ANL / HI-CUT
3 Push to Talk
4 CH9/19|SCAN
5 WX / ALERT
6 Channel UP and DOWN
7 Microphone

10
INSTALLATION
You can install the CMX660 either on top/
underneath a flat surface like a dashboard or
under the driver’s seat in a vehicle. Select a location
that is convenient for operating the radio but does not
interfere with the driver or passenger.
Plan the location of the radio and microphone
brackets before beginning installation.
Check the engine compartment and adjust
wiring that may interfere with bracket
installation.
The basic steps to install this unit are:
• Connect Power
• Connect Antenna
• Install Microphone Hanger/Connect
Microphone
• Install Radio Bracket/Install Radio
CONNECT POWER
Uniden recommends connecting the power lead
to the Ignition Switch Accessory Terminal. This
way, the radio is automatically turned off when the
ignition switch is turned off.
As an alternative, the power cord may be
connected to an available terminal on the fuse
block or to a point in the wiring harness. However,
be careful not to create a short circuit. If in doubt,
contact your vehicle dealer for information.

11
The CMX660 can operate on 12VDC power supply.
Ground Information
This radio may be installed and used in any 12-
volt DC negative ground system vehicle.
With a negative ground system, the negative (-)
battery terminal is usually connected to the vehicle
motor block.
Connect the red DC power cord from the radio to
the positive (+) battery terminal or other convenient
point. Then connect the black power cord to the
vehicle chassis or negative (-) battery terminal.
Connect Power
1. Connect the power cord to the power
connector from the radio.
2. Connect the red DC power cord to the
Ignition Switch Accessory Terminal or the
positive (+) battery terminal.
3. Next, connect the black power cord to the
Ignition Switch Accessory Terminal, the
vehicle chassis, or negative (-) battery
terminal.

12
4. Start the vehicle. The unit should turn on.
Turn the vehicle off. The unit should turn off.
MARINE INSTALLATION
Consult your dealer for information regarding
marine installation. It is important to adequately
ground the system and to prevent electrolysis
between the fittings in the hull and the water.
CONNECT ANTENNA
Because the maximum power output of the
transmitter is limited by the FCC, the quality of
your antenna is very important. To achieve the
maximum transmission distance, Uniden strongly
recommends that you install only a high quality
antenna. You have just purchased a superior radio;
don’t diminish its performance by installing an
inferior antenna.
Only a properly matched antenna system will
allow maximum power transfer from the 50-ohm
transmission line to the radiating element. Your
Uniden dealer is qualified to help you select the
proper antenna for your requirements. A whip style
antenna may be used for automobile installation.
CAUTION: Never operate your radio with no
antenna or with a damaged antenna cable.
This can damage the radio.

13
A short “loaded” whip antenna is easier to install
on an automobile, but its efficiency is less than
that of a full quarter-wave whip antenna.
Once your antenna is installed, tune it using a
Standing-Wave Ratio (SWR) meter (not included):
set it to channel 20 and adjust the antenna until
the SWR is as close as 1:1 as possible.
CAUTION: Make sure the SWR is less than 2:1
before using the radio. An SWR higher than
2:1 can damage the radio.
Safety Notice
The antenna used for this radio must be properly
installed and maintained and must provide a
separation distance of at least 16.9 inches (43 cm)
from all persons and must not be collocated or
operated in conjunction with any other antenna or
transmitter. Never transmit if any person is closer
than the specified distance to the antenna.
Note that Uniden does not specify or supply any
antenna with this radio. While a 0 dBi gain antenna
is normal for a typical installation, the above limit
applies to any antenna with up to 3 dBi gain.

14
INSTALL MICROPHONE HANGER/CONNECT
MICROPHONE
Install Microphone Hanger
1. Find a location to install the microphone
hanger. When you install the hanger, take
the same precautions as installing the radio
(see page 10). Adjust wiring if necessary.
2. Hang the microphone onto the hanger.
Connect Microphone
Mic Jack
1. Pull back the MIC jack rubber cover and
slide it back along the cord.
2. Insert the MIC jack into the radio’s MIC
socket until it clicks into place.
3. Gently tug on the cable to be sure the
connection is locked.

15
4. Slide the rubber cover down the cable and
cover the MIC jack to seal it from dust.
If you want to use the extension cable, connect
the cable to the radio and the MIC to the
other end of the extension cable.
Disconnect the Microphone
1. Pull back the MIC jack rubber cover and
slide it back along the cord.
2. Push down the MIC jack’s lock tab; tug
gently on the MIC cord until it disconnects.
If you are using the extension cable,
disconnect the cable from the radio and
the MIC from the other end of the extension
cable.
INSTALL RADIO BRACKET/INSTALL RADIO
The CMX660 uses a slide mount assembly to
mount the unit onto a surface. It can be mounted
either below or on top of a surface.
Attach Side Rails
1. Align the guide rails along the sides of
the radio and insert L-tabs into the L-tab
slots. Be sure the slide mount latches face
outward.

16
L-Tab
(2 on each rail)
L-Tab Slot
(2 on each side)
Slide Mount Latch
(1 on each rail)
2. Use the screws provided to fasten the guide
rails into position on the radio.
Attach Bracket/Install Radio
1. Using the screws provided, screw the
bracket into a stable, level surface. If
mounting the radio in a vehicle, for example,
screw the bracket onto the top of the
dashboard or underneath the dashboard.
Be sure the words “FRONT-SLIDE IN” are
visible from the front of the bracket.
Be sure you do not mount the bracket where
the screws can damage any wiring or
hardware. Move the wiring/hardware out of
the way or relocate the radio bracket.
2. Slide the back of the radio into the bracket
until the slide mounts latch and click into
place.
You can flip the display so that the indicators
appear right-side-up, no matter the
installation orientation (see “page 28).

17
EMERGENCY OPERATION
1. Press CH9/19|SCAN or use ▲ or ▼ to select
Channel 9.
2. Press PTT and speak clearly.
3. If there is no response, select an active
channel and ask that party to relay your
emergency broadcast on Channel 9.
All channels except Channel 9 may be used for
normal communication. The FCC reserves
Channel 9 for emergencies involving
the immediate safety of individuals or
protection of property. Use Channel 9 to
render assistance to a motorist.
This is an FCC rule and applies to all CB radio
operators.
USING YOUR CMX660
LCD DISPLAY
This LCD layout is for reference only. Different
icons display depending on scanner status.
Dimensions and layout may vary slightly.

18
ITEM OFF ON BLINKING
TX
T
Receiving Transmitting
(see page 20)
Transmit
error
ANL Status
Indicator
• ANL off
• WX mode
is on.
• ANL on (see
page 22)
• CB mode is on.
NA
S
Channel Scan
is off.
Channel Scan
is on (see page
23)
NA
Channel,
Setting
Indicator
In Menus, FLIP
setting.
• In Menus, other
settings
• Channel
number
• Menu mode
on
• TX error
Mode
Indicator
CB or WX
Mode is on.
CB/WX, Menu,
Volume Setting,
SQ Setting,
Rotary Select
mode on.
FLIP setting
on.
TX Power • No CB signals
received.
• WX receive
is on.
Transmitting in
CB mode; icons
1-5 display (see
page 20).
NA
RX Signal
Strength
• No incoming
CB signals.
• WX mode
is on.
Receiving
signals in CB
or WX mode;
icons 1-5 display
according to
signal strength
(see page 20
for CB and page
24 for WX).
NA

19
ITEM OFF ON BLINKING
WX Alert WX Alert is off. WX Alert is on
(see page 25).
NA
LO/DX • WX mode
is on.
• CB mode is on.
• LO/DX is on
(see page
22).
NA
Hi Cut • WX mode
is on.
• Hi Cut is off.
• Hi Cut is on
(see page
21).
• CB mode is on.
NA
Key Beep Key Beep
sound is off.
Key Beep sound
is on (see page
26).
Blinks during
ON/OFF
selection in
menus.
Roger Beep Roger Beep
sound is off.
WX mode is
on.
Roger Beep
sound is on (see
page 27).
• CB mode is on.
• WX mode is off.
Blinks during
ON/OFF
selection in
menus.
BASIC OPERATIONS
The CMX660 uses both the knob on the radio
and the ▲/▼ keys on the microphone to adjust
settings.
Turn On/O
The CMX660 remembers its power condition when
it is turned off or powered down. For example: if
the CMX660 is on when you disconnect power to

20
the unit, when you reconnect power it remembers
that it was on and returns to the ON state. You do
not have to press POWER again.
1. On the radio, press and hold the knob until
the LCD lights and the radio beeps. Power
is on.
2. Press and hold the knob again until the LCD
goes out and the radio beeps. Power is off.
Transmit/Receive
1. On the microphone, press and hold the PTT
key to transmit. TX and display.
2. Release PTT to receive. TX and go
away.
3. When receiving a transmission,
displays. The stronger the signal, the more
icons display (1 - 5).
Adjust Volume
Turn the knob on the radio to increase and
decrease the volume. There are 17 volume levels,
from 00 (Off) to 16. VOL XX displays.
Select Channel before Transmit/Receive
On the microphone, press the ▲/▼ keys to move
up or down the channels one at a time. Press and
hold them to move quickly through the channels.
The channel number changes (1 - 40).