Important Information Concerning Uhf Cb Radio - Vertex Standard VX-556 User Manual

Important Information Concerning UHF CB Radio

The use of the Citizen Band Radio Service is licensed in Australia by
the ACMA radio communications (Citizens Band Radio Stations) class
license and in new Zealand by the ministry of Economic Development
New Zealand (MED). A General user radio license for Citizens Band
Radio and operation is subject to conditions contained in those licenses.
The class license for users and equipment operating in the CB / PRS
477 MHZ band has been amended.
This radio meets the new 80-channel standard.
In simple terms the same amount of spectrum is available; However,
radio transceivers can now operate in a narrower bandwidth and hence
use less spectrum.
These radios are generally referred to as narrowband or 12.5 kHz
radios. By using 12.5 kHz channel spacing instead of 25 kHz, the 40
channels originally allocated can now be expanded to 80 channels there
by doubling the channel capacity and relieving congestion in the UHF
CB/PRS band.
Original 40 channel wideband radios continue to operate on the original
40 channels. However they will not be able to converse on the newer
channels 41-80.
The newer narrowband radios will be able to converse with all older 40
channel wideband radios on all channels 1 to 40 as well as the newer
channels allocated from 41 to 80.
The mixing of narrowband and wideband radios in the same spectrum
can cause some possible operating issues of interference and varying
levels of received volume.
Possible Issues
When a new narrowband radio receives a transmission from an older
wideband radio, the speech can sound loud and distorted. Adjust your
radio volume for best performance.
When an older wideband radio receives a signal from a new narrowband
radio, the speech can sound quiet. Adjust your radio volume for best
performance.
Depending on how close your receiving radio is to another transmitting
radio, there can be interference from the transmitting radio if it is using a
channel adjacent to the channel you are listening to.
Simply try going up or down a few channels from the currently selected
channel. The above situations are not a fault of the radio but a symptom
of operating wideband and narrowband radios in the same bandwidth.
This possible interference will decrease over time as the population of
wideband radios ages and decreases. This possible interference will
decrease over time as the population of wideband radios ages and
decreases.
Further information and updates are available from the Australian
communications and media Authority (ACMA) at
and the Ministry of Economic Development (MED), radio spectrum
management at: www.rsm.govt.nz.
Emergency Channels
The ACMA has allocated channels 5 / 35 for emergency use only.
Channel 5 is the primary simplex Emergency channel. Where a channel
5 repeater is available, you should select Duplex on CB-5R.
Note: Channel 35 is the input channel for the channel 5
repeater therefore channel 35 should also not be used for
anything other than emergency transmissions.
Telemetry Channels
ACMA regulations have allocated channels 22 and 23 for telemetry
only applications and have prohibited the transmission of speech on
these channels. Consequently your radio has a transmit inhibit applied to
channels 22 and 23.
In the event additional telemetry / telecommand channels are approved
by the ACMA, these channels shall be added to those currently
listed where voice transmission is inhibited. Currently transmissions on
channels 61, 62 and 63 are also inhibited and these channels are
reserved for future allocation.
English
www.acma.gov.au
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