Operation
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UNIDEN UH7740NB UH7750NB
UHF CB Transceiver
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.
The signal coming from your radio is received by the Repeater Station and the re-
transmitted at the same time on another channel. This operation is called “Duplexing”.
For example,
CH01 on Duplex Mode will Receive on CH01 but Transmit on CH31
CH02 on Duplex Mode will Receive on CH02 but Transmit on CH32 etc...
If you transmit on CH01 Duplex mode, you are actually transmitting on CH31 the
repeater station down-coverts your signal and retransmits on CH01.
Standard Operation without the aid of a
Repeater Station.
Operation with the aid of a Repeater
Station (Duplex).
