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GMR2838-2CK

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CHARGE

*Range may vary depending on environmental and/or topographical conditions.

•  15 GMRS / 7 FRS Channels
•  121 Sub Codes
  (CTCSS Tone and DCS Code)
•  Up to 28 Mile Range*
•  Internal VOX Circuitry
•  5 Selectable Call Tone Alerts
•  Backlit LCD Display
•  Optional Headset Accessories
• Headset Jack

  1  Antenna

  2  PTT (Push-To-Talk) Button

  3  Monitor Button

  4  Channel Up/Down key

  5  Call Key

  6  Headset Jack

  7  DC IN 9V

  8  Menu/Power key

  9  Volume Up/Down key

10 Microphone

11 Speaker

12  Battery Level Meter

13 Receive Indicator

14 Call Indicator

15 Scan Indicator

16 Hi Power Indicator

17 Low Power Indicator

18 Transmit Indicator

19  Volume Setting Indicator

20  Keypad Lock Indicator

21 VOX Indicator

22 Channel Indicator

23 Sub Code Indicator

24 Charging Contacts

Congratulations on your purchase of the Uniden 

GMR2838-2CK (General Mobile Radio Service) 

waterproof radio. This lightweight, palm-sized, radio 

is a state-of-the-art device, equipped with many 

valuable features. Use it at sporting events, to stay 

in contact with family and friends, hiking, skiing, 

outdoors, or in a neighborhood watch for vital 

communication - even outside by the pool!

Your radio complies with JIS4 water-proof 

standards, which means the radio is resistant 

to damage from light rain or water spray from 

all sides.

•  The radio will only meet this rating if fully 

assembled and all rubber seals and the jack 

cover is well maintained and correctly fitted. This 

means that the Headset plug is not inserted, and 

the Headset jack cover and the battery pack are 

attached and securely fastened. 

Note: 

If your radio is exposed to salt water, clean 

your radio thoroughly with a small amount of fresh 

water (do not submerse it) , and dry it before 

turning it on.

PACKAGE CONTENTS

Your package contains two radios, two rechargeable 

NiMH battery packs (#BP40), one AC adapter (#AD-

0001), one charging cradle (#RC1284), two belt clips 

and this reference guide. A NiMH battery pack powers 

your unit. To order the following optional accessories, 

visit our web site at www.uniden.com or call 1-800-

554-3988 during regular business hours. 

Use only Uniden accessories.

•  NiMH Battery Pack - #BP40
•  Charging Cradle - #RC1284
•  Headset - #ZA-133
•  AC Adapter - #AD-0001
•  DC Adapter - #DC-1002

GMRS LICENSE

The 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 radio uses a supplied NiMH battery pack.

To install the NiMH battery pack:
1) Make sure your radio is OFF.
2) Release the battery latch at the bottom of the 

radio, and remove the cover.

3) Install the NiMH battery pack into the battery 

compartment. Be certain to follow the 
instructions written on the label on the battery 
pack. Installing the battery pack incorrectly will 
prevent the unit from operating.

4) Before placing the battery cover back on the 

radio, check the rubber seal around the battery 
compartment and the ribbon of the battery pack: 
make sure that the seal is in good condition and 
that there is no foreign matter under the seal.

5) Replace the battery compartment door.

Note: 

If the rubber seal appears worn, nicked, or 

dried out, replacement seals are available from 
www.uniden.com or call 1-800-554-3988 during 
business hours.

USING THE RADIO

• Roger Beep
• Battery Charger
•  Battery Level Meter
• Channel Monitor
• Channel Scan
• Keypad Lock
•  DC IN 9V Jack

BATTERY LEVEL AND LOW BATTERY 

ALERT

This unit has a battery level meter on the display to 
indicate the status of the batteries. When the 
battery in the unit is low, the battery level meter 
icon 

 flashes. Recharge the NiMH battery 

pack immediately.

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.

GMR2838-2CK RADIO

CHARGING THE RADIO

2) Charge the battery pack for 16 hours until the 

battery indicator stops flashing.

Using the Charging Cradle

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 charging.

Note:

 

•  For charging batteries directly without the cradle, 

use only the #DC-1002 Cigarette Lighter Adapter 

cord, available from www.Uniden.com. 

Other power cords could damage your radio.

•  DC IN 9V Jack of the radio is for charge only.

Be sure to install the battery before charge.

•  Use only the supplied battery and AC adapter or 

approved accessories from Uniden.

•  Charge time may vary depending on the battery 

life remaining.

•  For fastest charging, turn off the radio before 

charging.

•  Battery must be installed for operation, even from 

external power.

•  If battery power is low, you cannot operate the 

radio even using external power. Allow the 

batteries to charge before using. If you try to 

transmit while power is low, the radio will 

automatically turn off.

Warrning!

•  The charging cradle is not waterproof. If the 

charging cradle falls into water, unplug it before 
attempting to remove it from the water. Allow the 
cradle to dry completely before reconnecting the 
power.

•  Wipe off dirt or shake water from your radio 

before placing in the charging cradle if your radio 
is soiled or wet.

Adjusting the Sound (Key Beeps)

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.

Choosing a Channel

Your radio has 22 channels and 121 Sub codes you 

can use to talk to others. In order to speak to 

someone, each of you must be set to the same 

channel and Sub code.
To choose a channel:
1) Press 

CH

   or   key to enter the channel 

select mode. The channel indicator flashes. 

2) Then press 

CH

   or   key to increase or 

decrease the channel number displayed. 

  To change the channel continuously, press and 

hold 

CH

   or   key for more than 1 second in 

channel select mode.

3) To set a desired channel, press 

MENU/ 

 key.

Note:

 

Channels 1-7 have an typical range of up to 

28 miles.  Channels 8-14 have an typical range of 

up to 5 miles.  Channels 15-22 have an typical 

range of up to 28 miles. You can know which GMRS 

or FRS channel is active by the icon. 

hi

 icon is 

displayed while scanning GMRS channels, and the 

lo

 icon is displayed while scanning FRS channels.

Choosing a Sub Code

Each of the channels 1-22 may have any one of 

the codes, OFF or 1-121 selected. Code 

oF

 (OFF) 

indicates no Sub code selected and your radio can 

receive a signal regardless of the code settings of 

the transmitting radio.

1) Press 

MENU/ 

 key.

2) Press the 

CH

   or   key to increase or 

decrease the code number displayed. You can 

also select 

oF

 (OFF) at this stage.

3) Press 

MENU/ 

 key.

Channel Scan Feature

Your radio has a channel scan feature that allows 

you to easily scan all 22 channels. When an active 

channel is detected, the radio pauses on that 

channel until the channel is clear. Then, after a 2 

second delay, the radio continues scanning. 

Pressing the 

PTT

 button while the scan is paused 

on a channel allows you to transmit on that channel.

To turn ON channel scan:
Press 

MENU/ 

 key twice. The 

scan...

 icon and 

oF

(OFF) blink. Press 

CH

   key to select on, and then 

press 

MENU/ 

 key. The channel number changes as 

the radio rapidly cycles through the channels.
To turn OFF channel scan:
Press the 

CALL

PTT

MENU/ 

 key.

Talking on Your Radio

To talk to others using the radio:
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 appears on the display. To avoid cutting 

off the first part of your transmission, pause 
slightly after pressing the 

PTT

 button before you 

start talking.

2) When you have finished speaking, release the 

PTT

 button. You can now receive incoming 

calls. While receiving, the 

 icon appears on 

the display.

Note: 

If PTT or VOX is continuously used, 1 minute 

after you start using the feature the transmission 
stops and you hear a timeout error tone.

Monitor Mode Feature

Your radio allows you to listen for weak signals on 

the current channel at the press of a key.
To turn ON the Monitor Mode:

  For brief listening, press 

MON

 button. The 

 

icon blinks.

  Press and hold 

MON

 button for 2 seconds until 

two beeps sound for continuous listening. The 

receiver circuit stays open, letting both the noise 

and weak signals be heard.

To turn OFF Monitor Mode:
   Press 

MON

 button to return to "Normal" mode, 

and the 

 icon stops blinking and disappears.

Navigating through the Menu

Use the MENU key to access your radio's 

advanced functions.

1) To enter the Menu, press the 

MENU/ 

 key.

2) Additional presses of the 

MENU/ 

 key 

advance you through the Menu until exiting to 

"Normal" operating mode.

3) Other methods of exiting the Menu function are: 

 a. Press and hold the 

MENU/

   key again.

 b. Press the 

PTT

MON

, or 

CALL

 key

 c. Wait 10 seconds until the unit automatically 

returns to “Normal” mode.

Voice Operated Transmission

Your 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.

1-5

OFF, 1-5

ON-OFF

VOX

Level

Call

Tone

Key Lock

SCAN

Mode

Sub Code

Setting

Start

Scanning

Sub Code

Change

 

To select the VOX level:
1) Enter the Menu. Advance through the Menu until 

the 

vox

 icon appears on the display. The current 

level (OFF, 1-5) will be indicated. Level 

oF

 (OFF)

disables VOX, while levels 1-5 set the sensitivity 

of the VOX circuit.

2) Press either the 

CH

   or   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.

Transmitting a Call Tone

Your radio is equipped with 5 selectable call tones 

that are transmitted when the 

CALL

 key is pressed.

To select a call tone:
1) Enter the Menu. Advance through the Menu until 

the 

call

 icon appears on the display. The current 

call tone number (1-5) is indicated.

2) Press the 

CH

   or   key to increase or 

decrease the number to the desired call tone. 

Each tone will be heard through the speaker.

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.

Key Lock

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.

2) To switch the Key Lock mode from 

oF

 (OFF) to 

on

, press the 

CH

   key.

3) To confirm the setting, press the 

MENU/

   key. 

The radio returns to the "Normal" mode.

Note:

 

If you exit the setting mode before confirming 

your selection by pressing the

 

MENU/

   

key, the 

Key Lock setting will be set to 

oF

 (OFF)

.

To unlock the keypad:
1) Press and hold the 

MENU/

   key to turn the 

radio OFF.

2) Press and hold the 

MENU/

   key again to turn 

the radio ON. The keypad is unlocked.

Note:

 

While in keylock on mode, you can still use 

the radio to receive, transmissions, use call, 

VO

   

or 

PTT

MON

 and 

MENU/

 

 to turn on or off 

the radio.

Automatic Power Save Feature

Your 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.

USING A HEADSET

You can use a headset (#ZA-133) for more private

communications. To use a headset, lift the rubber

cover from over the headset jack, then plug in the

headset.

Important: 

Your radio is not waterproof when 

using a headset jack. When you remove the headset,

be sure to fully press the jack cover into place to 

restore its waterproof capability.

Your radio can be charged directly or by using the

supplied charging cradle.

Make sure to turn the radio OFF before placing

the radio in the charging cradle.

Charge by Using the Radio

1) Connect the optional DC adapter (#DC-1002) to 

DC IN 9V jack of the radio and to a cigarette 

lighter port.

In order to get the most out of your new radio, read 

this reference guide completely before attempting to 

operate the unit.

Turning the Radio On and Adjusting the Volume

1) Press and hold the 

MENU/ 

 key to turn the 

radio ON, and increase the speaker volume by 

pressing the 

VO

   key. To decrease the volume, 

press the 

VO   

key.

2) Press and hold the 

MENU/ 

 key again to turn 

the radio OFF.

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