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The Signal coming from your radio is received by the Repeater Station and then retransmitted at the same time
on another channel. This operation is called "Duplexing".
For example,
CH01 on Duplex Mode will Receive on CH 01 but Transmit on CH31
CH02 on Duplex Mode will Receive on CH 02 but Transmit on CH32 etc ....
If you transmit on CH01 Duplex mode, you are actually transmitting on CH31, the repeater station down-converts
your signal and retransmits on CH01.
UNIDEN Model UH-089 FRS CB Radio
Operation
7
Turn the Rotary Channel Selector to select the
desired channel.
Selecting a Channel
Using Repeater Channels
UHF CB Repeaters are used to retransmit or relay your signal. Repeaters will extend the range of your radio and
overcome the shielding effect caused by solid obstructions. In normal Simplex operation, your radio transmits on
one particular frequency and receives on that same frequency. If there is a barrier that partially blocks your
transmitted signal, the probability of another radio receiving the signal is very slim. Hills, tall buildings, metallic
structures, ... etc. tend to act as a screen between radios.
Operation with the aid of
Repeater Station (Duplex)
Standard Operation without
the aid of a Repeater Station
Repeater Station
CH 31
CH 01
No Signal
being Received
Normal Simplex Operation
Transmitting on CH 31
SLCT
STORE
CTCSS
SCAN
OS/GS
MEM INST
INST SET
DUP
S/RF
VOL
Rotary
Channel
Selector
Call Function
Press the microphone Call Button. A two second ringing tone will be transmitted.
You may select from 2 types of ring tones (see p.10).
Transmitting
Select the desired channel. Press the Microphone’s PTT button and speak normally
into the microphone. Hold it approx. 7cm from your mouth. Release the PTT button
to end the transmission and listen for a reply.
CALL
PTT
FM