Uniden America UL107 Owners Manual

PRELIMINARY OWNER’S MANUAL

CONGRATUALTIONS!
You now own the best value in land mobile radio... from Uniden. You’ll find that it gives you
consistently outstanding performance in virtually all conditions and situations.

Prior to use, your radio must be properly licensed by the Federal Communications Commission
(FCC) and properly installed. Your Uniden Dealer will be able to help you with any or all of these
requirements and he will be there to assist you with all your future communications needs.

BASE STATION OPERATION

Base station operation of the MRU400 is as follows:

1. After initial power up, allow a 10 second warm-up period to ensure that the transmitter is

within FCC frequency specifications.

2. Rotate the squelch control fully counterclockwise.

3. Turn the squelch control to the right until all background noise disappears.

4. Adjust the volume control for a comfortable listening level.

5. Place the Repeat/Local switch in the “Local” position.

6. The monitor switch is used as follows:
a. Switch In : Lets you receive all messages broadcasted on a given channel.
b. Switch Out : Lets you hear only those calls meant for you or your group when

the microphone is in the hang-up bracket. When a message is received, the CALL light
will come on and remain on until you pick up the microphone. This is for the times
when you’re away from your station.

7. Before transmitting, monitor your channel to ensure that it is not busy. ( The BUSY light

will be on in this situation.)

8. To transmit, depress the Push-To-Talk switch on the side of the microphone and hold it in

while you transmit your message. Release the switch when your message is finished. For better
voice quality in your transmissions, hold the microphone vertically in front of your face with
the top of the microphone approximately level with your lips.

9. When your message is finished and a reply has been made, it is a good practice to always

hang-up the microphone.

REPEATER OPERATION

1. After initial power up, allow a 10 second warm-up period to ensure that the transmitter is

within FCC frequency specifications.

2. Place Repeat/Local Switch in the Repeat position.

3. That’s it! The MRU400 is now a single tone accessed repeater.

OPERATING CONTROLS AND THEIR FUNCTIONS

The MRU400 Repeater / Base Station is equipped with the following user controls:

1. On/Off Switch – located on the rear panel. When activated the switch applies AC power to

the unit.

2. Power indicator light – This LED will glow green during AC po wer operation and flash

green during battery operation.

3. Transmit Light – This LED indicates the presence of a carrier on the RX frequency and

enables the user to know that the channel is busy.

4. Busy Light – This LED indicates the presence of a carrier on the RX frequency and

enables the user to know that the channel is busy.

5. Mon (Monitor Switch) – By placing this switch in the monitor position the user can

monitor position the user can monitor or receive all messages broadcasted on the channel
frequency. When the switch is in the “Tone Sq” position, the user will only hear messages
intended for his or her group.

6. Call Light – This LED indicator is provided for use when the MRU400 is utilized as a

base station. It will come on and remain on when the correct CTCSS tone has been decoded by
the receiver, provided the microphone is in the hang up bracket and the “Mon” switch is in the
“Tone Sq” position. Reset of the call light can be accomplished by simply removing the
microphone from the hang up bracket or monentarily placing the “Mon” switch in the “Mon”
position.

7. Repeat/ Local Switch – When this switch is in the “Repeat” position, repeater action is

automatic and the repeater can be accessed by another station as well as the local microphone.
In the “Local” position, keying of the transmitter can only be accomplished by the use of the
microphone.

8. Squelch Control – This control adjust a the Local aud io amplifier opening sensitivity and

should be adjusted in the following manner. (Note: This control has no effect on repeater
operation).

a. Rotate the squelch control counterclockwise until background noise is heard.
b. Then rotate the control clockwise until the noise just disappears. For best results,