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GMR648-2CK
Congratulations on your purchase of the Uniden
GMR648-2CK (General Mobile Radio Service)
radio. This product is a lightweight, palm-sized
• 15 GMRS / 7 FRS Channels
• Battery Charger
radio. Use it at sporting events to stay in contact
• 38 CTCSS Codes
• Battery Level Meter
with family and friends, hiking, skiing, outdoors, or
in a neighborhood watch for vital communication.
• Up to 6 Mile Range*
• Channel Monitor
• Internal VOX Circuitry
This compact, state-of-the-art device is equipped
• Channel Scan
with many features.
• 5 Selectable Call Tone Alerts
• Keypad Lock
• Backlit LCD Display
• NOAA Emergency /
• Optional Headset Accessories
Weather Channels
PACKAGE CONTENTS
• Headset Jack
• Emergency Weather Alert
• Roger Beep
Your package contains two GMR648-2CK radios,
two rechargeable NiMH battery packs (#BP38), two
AC adapters (#AD-0001), two charging cradles
(#RC6488), two belt clips and this reference guide.
You may operate the unit using the rechargeable
NiMH battery pack or 4 AAA alkaline batteries
(not included). The following optional accessories
may be purchased by calling the Customer Hotline
at 1-800-297-1023 (Mon-Fri 7 am to 7 pm,
Sat/Sun/holidays--except Thanks giving and
Christmas--9 am to 5 pm, CST). Use only Uniden
accessories.
• NiMH Battery Pack - #BP38
• Charging Cradle - #RC6488
*Range may vary depending on environmental and/or topographical conditions.
• Headset - #HS2467
GMR648-2CK RADIO
GMRS LICENSE
The GMR648-2CK radio operates on the General
Mobile Radio Service (GMRS) frequencies when
using Channels 1-7 and channels 15-22. You
must have a GMRS license issued by the Federal
Communications Commission to legally use
these channels. For licensing information and
application forms, visit the FCC online at:
www.fcc.gov/wtb/uls or call the FCC hotline at
1-800-418-3676. If you have any questions, you
can contact the FCC direct at 1-888-225-5322.
No license is required for operation on channels
8-14 or operation on any channel in Canada.
INSTALL THE BATTERY
Your GMR648-2CK radio uses the NiMH battery
1 Antenna
15 Call Indicator
pack or 4 AAA alkaline batteries (not included).
2 PTT (Push-To-Talk) Button
16 Scan Indicator
3 Monitor Key
17 Channel Indicator
4 Call Key
18 Alert Indicator
To install the NiMH battery pack:
5 WX/Alert Key
19 Weather Indicator
1) Make sure your radio is OFF.
6 Channel/Scan Key
20 Transmit Indicator
2) Remove the battery compartment door by
7 Speaker
21 Volume Setting Indicator
pressing the tab at the bottom of the
8 Headset Jack
22 VOX Indicator
compartment door allowing the door to be
9 Up Key
23 GMRS/FRS Indicator
10 On/Off/Select Key
24 Keypad Lock Indicator
removed.
11 Microphone
25 CTCSS Indicator
3) Install the NiMH battery pack into the battery
12 Down Key
26 Charging contacts
compartment. Be certain to follow the instruction
13 Battery Level Meter
27 Charging LED
written on the label on the battery pack.
14 Receive Indicator
Installing the battery pack incorrectly will prevent
Normal
CTCSS
VOX Level
Call Tone
Key Lock
the unit from operating.
4) Replace the battery compartment door.
OFF, 1-38
OFF, 1-3
1-5
ON-OFF
BATTERY LEVEL AND
LOW BATTERY ALERT
1) To enter the Menu, press the sel/
key.
2) Additional presses of the sel/
key will advance
This unit has a battery level meter on the display to
you through the Menu until exiting to "Normal"
indicate the status of the batteries. When the battery in
operating mode.
the unit is low, the battery level meter icon
will
3) Other methods of exiting the Menu function are:
flash. Recharge the NiMH battery pack immediately or if
a. Press and hold the sel/
key again.
you are using the alkaline batteries, you must replace the
b. Press the PTT, mon, call, wx/alert, or ch/scan key
alkaline batteries in order to continue using the radio.
c. Wait 10 seconds until the unit automatically returns to
"Normal" mode.
Warning! To avoid the risk of personal injury or property
damage from fire or electrical shock, only use the Uniden
Choosing a Channel
accessories specifically designated for this product.
Your radio has 22 channels and 38 CTCSS codes
you can use to talk to others. In order to speak to
USING THE CHARGING CRADLE
someone, each of you must set to the same
channel and CTCSS code.
If you use the rechargeable NiMH battery pack, two
To choose a channel:
GMR648-2CK radios can be charged by using the
With the radio in "Normal" operating mode press the
charging cradle.
ch/scan key and press the L or M key to increase or
Make sure to turn the radio OFF before placing
decrease the channel number displayed.
the radio in the charging cradle. Otherwise the
battery level meter icon won't indicate properly.
Note: Channels 1-7 have an expectancy range of
up to 6 miles. Channels 8-14 have an expectancy
1) Connect the AC adapter (# AD-0001) to DC IN
range of up to 3 miles. Channels 15-22 have an
9V jack and to a standard 120V AC wall outlet.
expectancy range of up to 6 miles. You can know
2) Set the charging cradle on the desk or tabletop,
which GMRS or FRS channel is active by the icon.
and place the radio in the charging cradle with
The
icon indicates scanning GMRS channel,
the keypad facing forward.
and the
icon indicates scanning FRS channel.
3) Make sure that the LED illuminates. Charge the
battery pack for 16 hours and remove the radio
Choosing a CTCSS Code
from the charging cradle after charge.
Each of the channels 1-22 may have any one of
the codes, OFF or 1-38 selected. Code oF (OFF)
Note: The charge indicator LED will remain on as
indicates no CTCSS code selected and your radio
long as the radios are left in the charger.
can receive a signal regardless of the code settings
of the transmitting radio.
USING THE RADIO
1) Enter the Menu. The CTCSS code on the LCD
display will appear.
In order to get the most out of your new radio, read this
2) Press the L or M key to increase or decrease
reference guide completely before attempting to operate
the code number displayed. You can also select
the unit.
oF (OFF) at this stage.
Turning the Radio On and Adjusting the Volume
3) Exit the Menu.
1) Press and hold the sel/
key to turn the radio ON,
and increase the speaker volume by pressing the L
Talking on Your Radio
key. To decrease the volume, press the M key.
To talk to others using the radio:
2) Press and hold the sel/
key again to turn the radio
1) Press and hold the PTT button and speak in a
OFF.
clear, normal voice about 2-3 inches away from
Adjusting the Sound (Key Beeps)
the microphone. While you are transmitting, the
icon will appear on the display. To avoid
Your radio emits a beep each time one of the keys (except
cutting off the first part of your transmission,
for the PTT button and call key) is pressed. To turn this
pause slightly after pressing the PTT button
sound OFF, press and hold the call key while turning ON
before you start talking.
the radio. Repeat this step to turn the sound ON.
2) When you have finished speaking, release the
Navigating through the Menu
PTT button. You can now receive incoming calls.
To access the advanced features of the GMR648-2CK,
While receiving, the
icon will appear on the
your radio has a Menu function.
display.
Voice Operated Transmission
Key Lock
Normal
Your GMR648-2CK radio is equipped with a user
To lock the keypad:
selectable Voice Operated Transmitter (VOX) that
1) Enter the Menu. Advance through the Menu until
can be used for automatic voice transmissions. The
the
icon appears on the display. The current
VOX feature is designed to be used with a headset
Key Lock status oF (OFF) blinks on the display.
with a microphone. Transmission is initiated by
2) To switch the Key Lock mode from oF (OFF) to
speaking into the remote microphone instead of
on, press the L key.
pushing the PTT button.
3) To confirm the setting, press the sel/
The radio returns to the "Normal" mode.
To select the VOX level:
Note: If you exit the setting mode before confirming
1) Enter the Menu. Advance through the Menu until
the vox icon appears on the display. The current
your selection by pressing the sel/
Lock setting will be set to oF (OFF).
level (OFF, 1-3) will be indicated. Level oF (OFF)
disables VOX, while levels
-
set the
sensitivity of the VOX circuit.
To unlock the keypad:
2) Press either the L or M key to the desired VOX
1) Press and hold the sel/
key to turn the radio
sensitivity level. Use level 1 for increased
OFF.
2) Press and hold the sel/
key again to turn the
sensitivity to voice in normally quiet
environments, and use a higher level to reduce
radio ON. The keypad is unlocked.
undesired activation in very noisy environments.
Automatic Power Save Feature
3) Exit the Menu.
Your GMR648-2CK radio has a unique circuit
Transmitting a Call Tone
designed to dramatically extend the life of the
Your GMR648-2CK radio is equipped with 5
batteries. If there is no transmission nor an
incoming call within 3 seconds, your radio switches
selectable call tones that will be transmitted when
the call key is pressed.
to the Power Save mode. The radio is still able to
receive transmissions in this mode.
To select a call tone:
1) Enter the Menu. Advance through the Menu until
LCD Backlight
the call icon is shown on the display. The current
The LCD Backlight will automatically turn ON when
call tone number (
-
) will be indicated.
any key (except the PTT button) is pressed. The LCD
2) Press the L or M key to increase or decrease
display will illuminate for 10 seconds before turning
the number to the desired call tone. Each tone
OFF.
will be heard through the speaker.
3) Exit the Menu.
Monitor Mode Feature
Your GMR648-2CK radio allows you to listen for weak
To transmit the selected call tone, press the call
signals on the current channel at the press of a key.
key. The selected tone will automatically be
To turn ON the Monitor Mode:
transmitted for a fixed length of time. Call Tone will
• Press mon for brief listening, the
be cancelled when the PTT button is pressed.
blink.
• Press and hold mon for 2 seconds for continuous
Channel Scan Feature
listening. The receiver circuit will stay open, and
Your GMR648-2CK radio has a channel Scan
letting in both the noise and weak signals.
feature that allows you to easily Scan all 22
channels. When an active channel is detected, the
To turn OFF Monitor Mode:
radio will pause on that channel until the channel is
Press mon to return to "Normal" mode, and the
clear. Then after a 2 second delay, the radio will
icon stop blinking.
continue scanning. Pressing the PTT button while
the Scan is paused on a channel will allow you to
Roger Beep
transmit on that channel.
Roger Beep is a BEEP that is sent to notify the end
of transmission (both PTT and VOX transmission).
To turn ON channel Scan:
Roger Beep can be heard through the speaker when
Press and hold the ch/scan key until the scan...
Key Beep is on. Roger Beep is transmitted even if
icon is displayed. The channel number on the
Key Beep is turned off. However, Roger Beep will not
display will change as the radio rapidly cycles
be heard from the speaker.
through the channels.
To turn OFF channel Scan:
To turn ON Roger Beep:
Press and hold the L key while turning ON the radio.
Press the sel/
, call, PTT, or wx/alert key, or
press and hold the ch/scan key for 2 seconds.
To turn OFF Roger Beep:
Press and hold the L key while turning ON the radio.
key.
key, the Key
icon will

Summary of Contents

  • Page 1

    Warning! To avoid the risk of personal injury or property You may operate the unit using the rechargeable damage from fire or electrical shock, only use the Uniden NiMH battery pack or 4 AAA alkaline batteries accessories specifically designated for this product.

  • Page 2

    ELEMENTS OF WARRANTY: Uniden warrants, for (preferably in its original packaging). Disconnect the human exposure to radio frequency one year, to the original retail owner, this Uniden battery from the Product and separately secure the electromagnetic energy emitted by FCC regulated...

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