Uniden UM425 VHF DSC 사용자 설명서

While listening to a channel, adjust the 

 knob until the noise is 

filtered out and you can only hear the transmission. If you switch to a channel 

with a lot of noise or with a weak transmission, you may need to adjust the 

squelch level again.
NOTE: Setting the squelch level too high may prevent you from hearing 

weaker transmissions. If you are having difficulty hearing a transmission, try 

setting the squelch level lower.

Press the 

 or 

 buttons briefly to scroll through the 

channels one channel at a time. Press and hold the channel up or down 

button to quickly scroll through the channels.

To make a transmission, press and hold the microphone 

 button. 

Release the 

 button when you're finished talking to let the other 

party respond. 

To prevent stuck microphone problems or situations where the 

• 

 button is pushed accidentally, the radio limits your talk time 

to 5 minutes in a single transmission. If you talk for over 5 minutes 

continuously, the display shows RELEASE MIC BUTTON.
For the best sound quality, hold the microphone about two inches away 

• 

from your mouth.
You cannot transmit while the radio is in scan mode.

• 

See the channel list on page 57 for a list of receive-only channels. 

• 

In most situations, the 1 Watt transmission power is all you need. If you find 

yourself far away from other stations and have trouble getting a response, 

you may need to boost the transmission power from 1 Watt to 25 Watts:

Select the channel you want to transmit on.

1. 

Push the 

2. 

 button. The display shows 25 Watts in the upper left 

hand corner.
The transmit power remains at 25 Watts until you change the setting  

3. 

back. Push the 

 button. The display shows 1 Watt.

NOTE: Don’t forget to change the transmission setting back to 1 Watt when 

you move closer to other stations.

UM425 VHF OM.indd   20

28/9/11   11:55:16 AM