CB UHF & HF
considering the type of CB radio communication system you want it will be necessary
to understand the terms or 'language' and capacity of some of the types of communication devices
- refers to the radio frequency on which the
– UHF transceivers transmit and receive on the
same channel. To communicate through
repeaters, your transceiver must be able to
transmit and receive on different channels
(known as duplex).
– allows transmission on a different frequency
to that which it receives.
– a repeater system consists of a linked
transmitter/receiver combination installed in a
prominent location. The repeater is designed to
receive signals on a designated channel and
re-transmit them on another channel. Repeaters
are normally located on hills, mountains or tall
Channels 1-8 and 41-48 are designated repeater
output stations and channels 31-38 and 71-78 are
designated input channels.
designated repeater channels can be used for
single frequency communication provided they are
not used in the locality of repeaters.
that transmits on channel 1 will always receive
on channel 31. The CB radio automatically
selected the corresponding transmit/receive
and 35 are dedicated solely for emergency
– single sideband comes in three modes AM, USB
(upper side band) and LSB (lower side band).
The SSB is better for long distances and/or when
signals are weak as power is directed to one
sideband and the radiated power is increased.
– this stands for selective calling to
selectively call a friend over the air. It
can be used on either UHF or HF CB
transceiver is factory programmed with its own
unique Selcall Identification Number (Ident).
This number identifies your radio from others in
your area. So you need to make your Ident known
to anyone who may need to call you with
Selcall. When your Ident number is called your
transceiver will beep to alert you. Some CB
radios come fitted with a selcall facility using
(CTCSS) continuous tone coded squelch system
that is only authorised on UHF CB bands.
– or ‘radio telephone’ is where a connection is
made with the public telephone network from a
base station you call over a suitably equipped
HF radio. A service fee and call costs apply. A selcall is made to the provider’s base station,
then key in the telephone number on the radio
and commence the call when answered.
Keep in mind that conversations are not private.
evening scheduled times where you can check in
over the HF radio air, have a chat and
pass on messages
See also our
CB and UHF Communication.