Oricom DTX4200 Operating Instructions Manual page 2

The ACMA increased the number of available UHF CB channels.
To provide additional channel capacity within the UHF CB Band, the ACMA has increased the number of available
channels by changing from wideband to narrowband channels and adding the additional channels to the existing
40 channels. Some of the new channels are locked and cannot be used, see channel chart later in this user guide
for more information.
When did this take place?
Early in 2011, new AS/NZS Standards came into effect allowing operators to use additional narrowband channels and
also use narrowband transmissions on some current wideband channels. This increased the number of channels up
to 80, 75 of which are useable voice channels.
What issues may users experience during the transition phase?
When a new narrowband radio receives a transmission from an older wideband radio, the speech may sound loud
and distorted – simply adjust your radio volume for the best listening performance. When an older wideband radio
receives a signal from a new narrowband radio, the speech may sound quieter – simply adjust your radio volume
for best listening performance. When operating a narrowband radio or Channel 41 - 80 interference is possible from
wideband radios transmitting on high power or on adjacent frequency.
The issues described above are not a fault of the radio but a consequence of mixed use of wideband and narrowband
radios.
It is expected that as older wideband radios are removed from service that this issue will be resolved. Most radios in
use will be narrowband eliminating this issue.
This information is current at time of printing. For further up to date information please visit
www.acma.gov.au
This unit complies with all relevant Australian
and New Zealand approval requirements
AS/NZS 4365:2011