Uniden America Corporation SX377 User Manual

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3

4

5

8

10

11

Radio color/pattern varies 

according to model number.

6

7

9

15

14

13

12

•  22 Channels (15 GMRS /  

7 FRS Channels)

•  7 Weather Channels
•  142 Privacy Codes (CTCSS 

Tone and DCS Code)

•  Up to 37 Mile Range*
•  Internal VOX Circuitry
•  TRU Waterproof™ (IPX7/

JIS7) — Submersible and 

Floats

•  Direct Call with Name 

Display

•  143 Group Codes
•  Silent Mode
•  10 Selectable Call/Ring Tone 

Alerts

•  Backlit LCD Display
•  Roger Beep
•  Call Alert; Vibrate
•  2 Earbuds with VOX Mic or 2 

Headset Boom Mics 

(depending on model 

number)

1

Antenna

9

Charging Contacts

2

Push to Talk

10

MicroUSB port and 
earbud jack

3

Boost (Change 
transmission power 
from 1.0W to 2.5W.)

11

Channel (UP/DOWN)

4

Channel UP/DOWN

12

Enter/Lock

5

Menu/Power

13

Tone/Group

6

D Call

14

WX Alert

7

Light/MON

15

Microphone

8

Speaker

Congratulations on your purchase of a Uniden 

SX377/379 series 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.
Your radio complies with IPX7/JIS7 water-

water for 30 minutes without damage.
•  The radio will only meet this rating if fully 

assembled and all rubber seals and the jack 

cover are 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.

•  After your radio is submerged in water, you 

might notice that the sound is distorted. This is 

because water remains in and around the 

speaker and microphone. Just shake the radio 

to clear excess water, and the sound should 

return to normal.

Each radio uses 3 AA rechargeable Ni-MH 

batteries, included. 
If your model number contains a "C," your 

package contains a microUSB Y charging cable. 
If your model number contains "CK," it contains a 

charging kit (including a charging cradle).
If your models number contains "HS," it contains 

headsets.
Refer to the packaging for other specific 

contents.

These radios each use 3 rechargeable AA NiMH 

batteries for power (included).

1. Remove the belt clip if necessary.
2. Turn the screws holding the battery 

compartment counterclockwise with a 
screwdriver and lift up the battery cover,

3. Insert the NiMH batteries in the battery 

compartment according to the directions 
inside the case. Installing the batteries 
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. Make sure that the seal 
is in good condition and that there is no 
foreign matter under it. 

5. Replace the battery compartment door. 

Tighten the screws securely.

6. Replace the belt clip if necessary.
Note: If the rubber seal appears worn, nicked, 

Follow these instructions to charge or recharge 

your radios.
Make sure to turn the radio OFF before 

placing it in the charging cradle.
1. Insert the adapter's microUSB plug to DC IN 

5V USB jack of the charging cradle and plug 
the other end into an AC outlet.

2. Set the charging cradle on a stable desk or 

tabletop and place the radios in the charging 
cradle with the keypad facing forward.

3. Make sure that the LED illuminates. Charge 

the batteries for 16 hours and remove the 
radio from the charging cradle after charging.

Note: 
•  Use only the supplied batteries and AC 

adapter or approved accessories from 

Uniden.

•  Charge time may vary depending on the 

battery life remaining.

•  The batteries must be installed for the unit to 

operate, even if the unit is also connected to 

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.

•  Charge time may vary depending on the 

battery life remaining.

•  For faster charging, turn off the radio before 

charging.

•  The charging cradle is not waterproof. If the 

charging cradle falls in the water, unplug it 

than 1 second.
Note: Channels 1-7 and 15-22 have a typical 

Group mode lets several people talk on the 

same channel in a separate group. In order to 

use Group mode, you need to initialize specific 

settings in your radio:
•  Set the radio to Group mode.
•  Set a Group Code.
•  Set a Unit Number.
•  Set a "Nickname."

To set the radio to Group mode, which enables 

Direct Call, Auto Channel Change, and All Call, 

press and hold 

TONE/GROUP for 2 seconds. 

The radio displays GRP

and group code

.

Set the group code for your radio group from 

0-142. Everyone in your group must select the 

same group code in order to communicate with 

each other.
1. Press

TONE/GROUP in Group mode. Press 

CH 

 

or   to select the group number.

2. Press 

ENTER/LOCK or TONE/GROUP to 

return to normal operation.

Each radio in your group needs to be set to a 

unique unit number, from 1-16.
1. Press 

MENU/  . Advance through the menu 

until 

UNIT appears, and then press ENTER/

LOCK. The current unit number flashes.

2. Press 

   

or   to select the desired unit 

number.

3. Press 

ENTER/LOCK to continue to the next 

section.

Your nickname appears on other units’ displays 

when you make an All Call or Direct Call. This is 

also the name that appears on other radio 

displays when someone wants to make a Direct 

Call to you. Without a nickname, the unit 

number shows.
1. Press 

MENU/   and advance through the 

menu until 

UNIT appears; then press 

ENTER/LOCK. The current unit number 
flashes, then press 

ENTER/LOCK The radio 

displays

 (or your current nickname) 

with the first place in the nickname flashing.

2. Press 

   

or    to select the letter, then 

ENTER/LOCK to advance to the next letter 
until you have entered your nickname.

3. Press 

MENU/   to confirm the setting and 

exit the menu.

Group mode lets you make direct calls to other 

people in your group without alerting the entire 

group and also lets you quickly change 

everyone in your group to another channel from 

a single radio. Before using Group mode, follow 

the instructions in "Setting Up Group mode" on 

every radio in your group. Then, to record the 

unit ID and everyone’s nickname in every radio, 

send a call to "All" from each radio one time 

(see "Sending a Direct Call").

Direct Call lets you call everyone in your group 

at once, or call a single person in your group 

without anyone else in the group knowing. It is 

like a "speed dial" directly to the person(s) you 

want to talk to.
To call everyone in your group, press 

D CALL in 

Group mode. The radio flashes ALL. Then, 
press 

D CALL or ENTER/LOCK Everyone in 

your group receives a call "chirp" for about 3 

seconds. When the chirp ends, begin your 

conversation.
Note: When you make a direct call to "all," your 

your group.
To call one person in your group without having 

other people know, press 

D CALL in Group 

mode. Then, use 

CH 

 

or   to select the 

person you want to call and press 

D CALL or 

ENTER/LOCK. Your radio sounds tones for 3 

seconds as it sends the call. When the selected 

person answers, you can begin your 

conversation.
You can silence the call tones any time by 

pressing 

PTT or BOOST.

Your conversation remains private between you 

and the person you called until 15 seconds after 

your last conversation. Then, your radio 

automatically exits Private mode.

Auto Channel Change lets you easily coordinate 

a channel change for everyone in your group. 

You might want to do this when you find you are 

getting a lot of interference on your current 

channel. You also use this feature to change 

from a low-power channel (8-14) to one of the 

To turn on channel scan:
Press 

MENU/  . The radio displays SCAN. 

Press 

ENTER/LOCK. The channel number 

changes as the radio rapidly cycles through the 

channels.
Use the radio in Standard (not Group) mode 

when you need to be able to communicate with 

radios that do not have the group feature.

To talk to others using the radio:
1. Press and hold 

PTT or BOOST and speak in 

a clear, normal voice about 2-3 inches away 
from the microphone. While you transmit, 
TXHI or TXLO appears on the display 
according to the type of channel. To avoid 
cutting off the first part of your transmission, 
pause slightly after pressing 

PTT or BOOST 

before you start talking.

2. When you finish speaking, release 

PTT or 

BOOST. You can now receive incoming calls. 
While receiving, RX appears on the display.

Note: 
•  When you press 

power when a GMRS channel is selected. 

•  If BOOST, PTT or VOX is continuously used, 

1 minute after you start using the feature the 

transmission stops and you hear a timeout 

error tone.

Your radio lets you listen for weak signals on 

the current channel at the press of a key.
To turn on the Monitor mode:
•  Press and hold 

LIGHT/MON for 2 seconds 

until two beeps sound for continuous 

listening. The receiver circuit stays open, so 

you hear both the noise and weak signals.

To turn off Monitor mode:
Press 

LIGHT/MON to return to the previous 

mode. MON and RX disappear.

Your radio has a Menu function to access 

advanced features. In order to use Auto 

Channel Change, you need to set your radio to 

Group mode.

Start 

Scanning 

Scan 

Mode 

Silent 

Mode 

ON-OFF 

Auto 

Channel 

Change 

Channel 

Change 

VOX 

Level 

OFF, 1-5 

1-10 

Call 

Tone 

Unit 

Setting 

Setting 

Unit 

Number 

Roger 

Beep 

ON-OFF 

Beep 

Tone 

ON-OFF 

Setting 

Nickname 

1. To enter the menu, press 

MENU/  .

2. Press 

MENU/   again to advance through 

the menu. After the last menu item, the radio 
exits to the previous mode.

3. Other ways to exit the Menu function are:

a. Press 

PTT, BOOST, LIGHT/MON, D 

b. Wait 10 seconds until the radio 

automatically returns to the previous 
mode.

When you turn on Silent mode, all incoming 

calls are muted, the display backlight flashes, 

and the channel indicator displays SLNT and 

CALL to alert you to an incoming call. If you do 

not respond to the call within 15 seconds, the 

backlight turns off. The radio will also vibrate to 

remind you that you missed a call. Silent mode 

is disabled for 15 seconds when you transmit, 

receive, or press any other button.
To set Silent mode:
1. Enter the menu. Advance through the menu 

until the SLNT displays, then press 

LOCK. The current setting flashes.

2.  Press 

 

 to display 

on, then press ENTER/

If you receive an incoming call while Silent 

mode is on and do not respond, the radio will 

turn on the Missed Call icon. If you are using 

Group mode, the radio will also indicate who 

made the call.
The radio

 

also remind you of a missed call by 

vibrating every minute after the call for 3 

minutes.

•  BOOST for Maximum 

Range*

•  Headset Jack
•  Auto Channel Change
•  Battery Level Meter
•  Rechargeable NiMH 

Batteries

•  Dual Charging Cradle 

with AC Adapter

•  Channel Monitor
•  Channel Scan 

Group Scan

•  Keypad Lock
•  Emergency Weather 

Alert

•  Emergency Light
•  Last Channel Memory

high-powered channels (1-7, 15-22) for more 

range (or to a low-power channel if you need 

longer battery life).
To start an auto channel change, on any radio 

in the group, press 

MENU/  . Advance through 

the menu until CHCX

 appears, then press 

ENTER/LOCK. The current channel flashes. 
Use

 CH 

 

or   

 to select the target channel. 

You can check whether the selected channel is 
clear. Then press 

D CALL or ENTER/LOCK.

Your radio chirps for about 10 seconds while it 

sends out the channel change signal. As each 

radio receives the channel change signal, it 

chirps once, then changes to the new channel.
To ensure all radios make it to the new channel, 

we recommend you:
•  Make sure you are in an open environment, 

where the radio will get the best range.

•  Optimize range during the channel change 

signal by raising the radio over your head to 

give the best possible height.

•  Do a "roll call" on the new channel after the 

move to be sure no one was left behind. If 

you missed someone, return to the previous 

channel and issue the signal again.

Use the radio in Standard (not Group) mode 

when you need to be able to communicate with 

radios that do not have the group feature.

You can select a Privacy Code from 1-142 for 

each channel. oF (off) indicates no Privacy 

Code selected and your radio can receive a 

signal regardless of the code settings of the 

transmitting radio.
1. Press 

TONE/GROUP. The Privacy Code 

indicator flashes.

2. Press 

CH 

 

or   to increase or decrease 

the code. You can also select oF.

3. Press 

ENTER/LOCK or TONE/GROUP to 

return to normal operation.

Your radio has a channel scan feature that lets 

you 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 resumes scanning. 

Pressing 

PTT or BOOST while the scan is 

paused on a channel lets you transmit on that 

channel. 

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. Initiate transmission by speaking 

into the remote microphone instead of pushing 

PTT and BOOST. To select the VOX level:
1. Press 

MENU/  . Advance through the Menu 

until 

VOX appears on the display, then press 

ENTER/LOCK. The current level (off, 1-5) 
flashes. Level oF (off) disables VOX, while 
levels 1-5 set the sensitivity of the VOX circuit.

2. Press either 

CH 

 

or    to reach the desired 

VOX sensitivity level, then press 

LOCK. 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.

Your radio is equipped with 10 selectable call 

tones that are transmitted when you press 

CALL in Standard mode.
The selected tone also will be heard when 

someone places a direct call to you.
To select a call tone:
1. Press 

MENU/  . Advance through the menu 

until CALL appears, then press 

ENTER/LOCK. 

The current call tone number (1-10) flashes.

Press 

   

or    to increase or decrease the 

number to the desired call tone. Each tone will 
be heard through the speaker. Press 

LOCK to select a call tone.

To transmit the selected call tone, press 

D CALL. 

The selected tone is transmitted for a fixed length 

of time. Press 

PTT or BOOST to cancel.

Roger Beep is a beep that is sent to notify the end 

of transmission (both PTT and VOX transmission). 

You can hear Roger Beep through the speaker 

when both Roger Beep and Beep Tone are on. 

When Roger Beep is on and Beep Tone is off, you 

do not hear Roger Beep, but it is transmitted to 

your party.
To adjust Roger Beep, press 

MENU/  . Advance 

through the menu until RGR appears, then press 
ENTER/LOCK. The current setting flashes.
To turn off Roger Beep:
Press 

CH    to display oF, then press ENTER/

LOCK.
To turn on Roger Beep:
Press 

CH 

 

to display 

on, then press ENTER/

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.

Depending on the model number, your radios 

may come with an earbud headset with mic on 

the cord or with a boom mic headset. 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 

This radio has a battery level meter that 

indicates the battery power level. When the 

battery level is low, the battery level meter icon 

 flashes and then BATT appears after 30 

seconds. Recharge the NiMH batteries 

immediately.
Warning!  To avoid the risk of personal injury or 

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

read this reference guide completely before 

attempting to operate it.

1. Press and hold 

MENU/   to turn the radio 

on.

2. Press 

VO 

 

or 

 t

o increase or decrease 

the volume level then press 

3. Press and hold 

MENU/   to turn the radio 

off.

Your radio has 22 channels and 142 Privacy 

codes you can use to talk to others. In order to 

speak to someone, both your radios must be set 

to the same channel and Privacy code.
To choose a channel:
Press 

   

or  , then press 

   

or   to 

increase or decrease the channel number 

displayed.
To scroll through the channels, press 

CH 

 

or 

 , then press and hold 

CH 

 

or   for more