Transmitting, Using Repeater Channels Duplex Mode

UNIDEN Model uh015sx UHF CB Radio

Operation

Transmitting

The uh015sx uses the 40 UHF-CB Channels. See page 36 for

UHF-CB Channels & Frequencies.

Channels 22 and 23 are for telemetry and telecommand applications. Transmit is inhibited on these channels.

Select the desired channel. Press the microphone's PTT button and speak normally into the microphone. Hold it approx. 7cm from your mouth. The TX icon appears while transmitting. Release the PTT button to end the transmission and listen for a reply.

Using Repeater Channels (Duplex Mode)

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.

Standard Operation without the aid of a Repeater Station.

Operation with the aid of a Repeater Station (Duplex).

The signal coming from your radio is received by the Repeater Station and then 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.