Genex GMRS-1904BLT Assembly instructions

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1. General Specification
-Power On/Off Volume
-PTT Key : Side [ Tact SW ]
-Monitor Key : Side [ Tact SW ]
-UP Key : Top
-Down Key : Top
-SCAN Key : Top
-CALL Key : Top
-Function Key : Top
-EXT Mic/Charge Jack[ 2.5?]
-EXT Speaker Jack[ 3.5?]
2. FUNCTION Flow Chart
1) GMRS
?FUNCTION ?CHANNEL ?CTCSS ?PWR Hi/Low ?DW ?VOX ?BEEP ?
Roger Beep ?Ringer Tone ?Vibration ?FUNCTION
2) Weather
?FUNCTION ?Alert ?BEEP ?FUNCTION
3. LCD Display

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4. FRONT, SIDE, TOP OVERVIEW

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5. Operating Instruction
1) On/Off & Volume control Switch
-Radio ON : Press and hold down the Power[ ] button for over 2seconds.
All indicators will appear momentarily on the LCD and you will hear short beep sound.
-Radio Off : Press and hold down the Power[ ] button for over 2seconds until all indicators
Disappear on the LCD.
-Volume setting : Press up[?] or down[?] button to choose the adjust level that is most
-Comfortable for you.
2) Setting the Channel
GMRS-1904BLT has 22 main channels.
?To select the channel
-Turn the radio on
-Press Function[F] button once,Press up[?] or down[?] button to choose the channel.
3) Setting the Tone Code(CTCSS)
GMRS-1904BLT has 38 CTCSS Codes
?To set the Tone Codes(CTCSS)
-Press Function[F] button once more,[XX-00 up to 38] will appear and tone code digit will blink
on the LCD. " 00 " means no CTCSS code.
-Press up[?] or down[?] button to choose the desired sub-channel to use.
-Press the PTT button or Function[F] button to confirm.
4) Setting the Transmit Power HI/LO
-HI : 1.6W TX power (ERP)
-LO : 500mW TX power
?To set the TX output power
-Press the Function[F] button until the [ Po LO or HI ] appears.
-Press the up[?] button or down [?] button to set the TX power
-Press the PTT button or Function[F] button to confirm.
-HI or LO will appear on the LCD.

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-If the battery is in low condition, the TX Power will be switched to LO automatically.
Even though the TX power is set to HI.
5) Setting the DW(dual watch) and CTCSS in DW Function.
?To active the DW Function
-Press the Function[F] button until the [ oF or 1 up to 15] and DW icon blink on the LCD.
-Press the up[?]button or down [?] button to choose the channel.
-" oF " means no DW Function.
-Press the PTT button or Function[F] button to confirm.
-DW icon will appear on the LCD.
?To stop the dual watch(DW)
-Press the "S"Scan button, the unit will stop the dual watch and will return to normal operation
and DW icon will be disappeared from the LCD.
6) VOX (Voice Operated Transmission)
This option enables you to have hands-free conversation. You do not have to operate the PTT
button each time when you want to transmit.
You can also choose the VOX sensitivity to suit your environment of operation.
(Ex ; noisy road, motor bike, factory etc.)
?To set the VOX Function.
-Press the Function[F] button until the [ Uo oF or x ] appears. x is a VOX level
-VOX icon will be appeared on the LCD.
?To set the VOX level
-Press the up[?] button or down [?] button to set the VOX level from 1 to 5.
"oF" is disable the VOX function.
" 3 " is most sensitive.
" 1 " is least sensitive.
-Press the PTT button or Function[F] button to confirm.
7) Beep tone
?To activate or disable the beep tone
-Press the Function[F] button until [bP on or oF] and the BELL[]icon blink on the LCD.
-Press the up[?] button or down [?] button.
-Press the PTT button or Function[F] button to confirm.

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8) Roger tone
This feature will give the tone signal to other parties when transmitting finished (when PTT
button is released.)
?To activate or disable the Roger tone
-Press the Function[F] button until [rb on or oF] and the Roger [ ]icon blink on the LCD.
-Press the up[?] button or down [?] button.
-Press the PTT button or Function[F] button to confirm.
9) Setting the Ringer
This feature provides 3user selectable call ringer signal and vibration.
?To set your favorite call ringer signal.
-Press the Function[F] button until the [ CA 1 or up to 3] appears on the LCD.
-Press the up[?] button or down [?] button to select the call melody type.
-Press the PTT button to confirm.
-To activate the call , click the "PTT" button twice quickly.
10) Setting the Vibration Functions
?To set for Vibration
-Press the Function[M] button until the [ Ubonor oF ] and Vibrator[ ]icon blink on the LCD
-Press the up[?] button or down [?] button.
-Press the PTT button or Function[F] button to confirm.
11) Transmitting
-Press and hold the PTT button (The "TX" LED will light with red color)
-Speak slowly and clearly
-To stop the transmission, release the PTT button
-If there are no more receiving signal for 5 seconds, the unit will go into power save Function
12) Receiving
The coding feature reduces the possibility of interference and provides enhanced communication.
You can only listen to a call that has correct matching code.
?Important ;
Before transmitting or receiving to the other parties ;

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-Correct channel is selected ( 1 to 22 ) and
-Correct code is set ( 00 to 38 )
13) Channel Scanning
This feature allows you to monitor all activated channels while scanning.
?To activate the Scan
-Press the Scan[S]button
-Radio will begin scanning.
-When in scan Function,the display will show each scanning channel.
-After an activated channel is scanned and received signal and then if there is no more signal, the
scan will resume automatically.
?To disable the Scan
-Press the Scan[S]button, the unit will stop the scanning.
-SCAN icon indicator will disappear from the LCD
-The unit will return to home channel.
14) Call
-Press the Call[C]button.(The "TX" LED will light with red color.)
15) Monitoring the channel
It is used for listening the week signal or to hear all activities on the channel by manually
overriding channel sub tone code setting.
?To activate the Monitor feature
-Press the Monitor[MON]button once.
(The monitor[]icon will appear on the LCD.)
?To disable the Monitor feature
-Press the Monitor[MON]button once.
(The monitor[] icon will disappear on the LCD.)
16) Backlight
Backlight is used to improve the display visibility in dark condition.
?To activate the Backlight
-Press and hold the Monitor[MON]button in a moment.
?To disable the Backlight
-Press and hold the Monitor[MON]button in a moment once again.
17) Keypad Lock
The lock function is to avoid the accidental changes to channel with other radio settings. All

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buttons will be locked except the Power, PTT and monitor button.
?To lock the keypad
-Press and hold down the Scan[S]button for over 2 seconds.
-Keypad will lock.( LOCK[] icon will appear on the LCD)
?To unlock the keypad
-Press and hold down the Scan[S]button for over 2 seconds.
-Keypad will unlock. ( LOCK[] icon will disappear on the LCD)
18) Battery status indicator
The Battery[ ]icon will blink when the radio is in low battery power.
Charge the rechargeable battery or replace the batteries.
-Full battery -Battery[ ] icon is not displayed.
-Low battery -Battery[ ] icon is displayed.
-Low battery warning –Battery[ ] icon will blinking.
19) External charger socket
MIC socket can be used for the charging purpose.
It should use the recommended rechargeable battery and wall charger.
20) External Speaker -Mic
Use the approved accessories only to have the optimum performance.
-Ear/Mic unit
6. Weather Radio
GMRS-1904BLT has 10 WX channel and Weather alert receiving feature.
1) Weather Radio setting
-Press the Weather[WX]button.
-Weather[WX]icon will appear on the LCD.
?To set the Weather Radio channel
-Press the Weather[WX]button once, the [ XX ] will appear. XX is a channel.
-Press the up[?] button or down [?] button to find a broadcast channel.
( Refer to area service channel. One or two channel is available)
?To return to GMRS Function
-Press the Weather[WX]button, the unit will return to GMRS Function.
2) Weather alert setting

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Alert setting is available in Weather Function only.
?To set the Weather alert receiving Function
-Press the Function[F] button until the [ AL on or oF] blinks.
-Press the up[?] button or down [?] button to set the alert function.
-While the alert is ON, weather[WX] icon will blink both in GMRS and weather Function.
-Weather[WX]icon will stop the blinking on the LCD when the alert is OFF.
-While the unit is in GMRS Function,if the alert signal is received, the unit will set to Weather
Radio Function automatically and warning beep tone will generate.
-While the unit is in Weather Function,if the alert signal is received, the unit will generate the
warning beep tone.
FCC Information
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS :
(1) THIS DEVICE MAU NOT CAUSE HARMFUL INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDERSIRED OPERATION.
Safety Information For GMRS UNIT
“Important: FCC RF Exposure Requirements:
-Operation must not exceed a maximum transmitting duty factor of 50% for satisfying RF exposure compliance.
-For body-worn operation, this radio has been tested and meets the FCC RF exposure guidelines when used
with GENEX accessories supplied or designated for this product. Use of other accessories may not ensure
compliance with FCC RF exposure guidelines. Use only the supplied antenna. Unauthorized antennas,
modifications, or attachments could damage the transmitter and may violate FCC regulations. “
Normal Position: Hold the transmitter approximately 1” from your face and speak in a normal voice,
with the antenna pointed up and away.
GMRS Licensing requirements: The Code of Federal Regulations requires the owner/operator
of this equipment to hold a FCC license when operating in the GMRS mode. Operation on the GMRS
frequencies is subject to additional rules as specified in 47 CFR Part 95.

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GMRS / FRS Frequency Chart
Channel Frequency
(MHz)
Use Power Channel Frequency
(MHz)
Use Power
1462.5625 FRS/GMRS High/low 12 467.6625 FRS/GMRS Low
2462.5875 FRS/GMRS High/low 13 467.6875 FRS/GMRS Low
3462.6125 FRS/GMRS High/low 14 467.7125 FRS/GMRS Low
4462.6375 FRS/GMRSHigh/low 15 462.5500 GMRS High/low
5462.6625 FRS/GMRS High/low 16 462.5750 GMRS High/low
6462.6875 FRS/GMRS High/low 17 462.6000 GMRS High/low
7462.7125 FRS/GMRS High/low 18 462.6250 GMRS High/low
8467.5625 FRS/GMRS Low 19 462.6500 GMRS High/low
9467.5875 FRS/GMRS Low 20 462.6750 GMRS High/low
10 467.6125 FRS/GMRS Low 21 462.7000 GMRS High/low
11 467.6375 FRS/GMRS Low 22 462.7250 GMRS High/low
Note: Channels 1 through 14 are shared with FRS radios. Operation in the FRS band without a
FCC license is restricted to low power transmit (0.5 watts). The GMRS radios require the user to
place the unit in low power mode for FRS operation. The GMRS unit will automatically select low
transmit power when FRS channels 8-14 are selected.