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.