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UHF Repeaters how they Work

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AUSTRALIA

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Here I will try to explain how a Repeater works.

First thing that you must know that a repeater will only repeat what it hears, so if your signal is low in strength to the repeater site, it will repeat exactly what it hears.

Now that we have got over that first step the next step is, how it all works and what to expect from a repeater.

A repeater is a single device that stands by itself on a hill top, Mountain top, Silo (grain Store), or very tall buildings.

 

As more people will know that UHF (Ultra High Frequency) will only travel line of sight, due to the frequency it uses. Here in Australia and NZ we are lucky to have a UHF CB Service in the middle of the Commercial Radio Band 40 Channels in total and about 350 Repeaters around Australia. See Repeater Page. Channel 1 - 476.425 Mhz to Channel 8- 476.600 Mhz & Channel 31 - 477.175 Mhz to Channel 38 - 477.477.350 FM (Frequecny Modulation) just like the commercial FM radio stations.

 

Repeater work as Pairs ie: 1 to 31 , 2 to 32 , up to 8 to 38, the Lower Number is what you put your radio on and Press the DUP or REPT button on your radio, The Display will not change when you are in Repeater Mode.

 

In most cases you will have a range of about 30Kms to 100Kms on the Repeater in your area. This range will depend on the location of the Repeater, the height it is above the ground and the clear view in all directions, if not you will find the range decreased in that direction. A mountain ridge or a large hill in that direction will reduce the coverage area also.

 

One more thing that we get asked, is can one repeater talk to another repeater to extend your range, the answer is NO.

 

Each repeater has its own target area and in some cases another repeater on another channel will over lap the area you are in, so if you travel around Australia a lot you will find our repeater list at the top of this page very helpful, it is done on a state by state and within each state you will find the the same channel will be used over and over a few times, as stated before they are all stand aloan devices and are not connected to each other to make a larger coverage area.

 

Repeaters use two channels to operate, First I will explain that when you push your DUP, or REPT button on your radio it will do the changeover each time you push and release the PTT button on the side of your Microphone.

When you press the PTT Button, the radio internals will switch the Transmitter up 30 channels to the input channel, ie channel 1 on your radio will now transmit on channel 31 but the display will not change to 31, then when you release the button the radio's receiver will come back to channel 1. See information picture below.

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