Uniden America Corporation UT051 User Manual

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•  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!

•  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 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. You can operate the unit 

using the rechargeable NiMH battery pack. 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

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.

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

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.

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, 

Warrning!:
•  The charging cradle is not waterproof. If the 

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 

or FRS channel is active by the icon. hi icon is 

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.

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 

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 to 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 button to access your radio's 

advanced functions.

1) To enter the Menu, press the MENU/   key.

2) Additional presses of the MENU/   key 

advances 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 is shown 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.

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 

radio to receive transmissions, use call, VO   or 

, PTT, MON and MENU/   to turn on or off the 

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.

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 or waterproof when 

Your radio can be charged directly or by using the

supplied 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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