Uniden Radio GMR648 2CK User Manual

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

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