Important Information; Possible Issues; Emergency Channels; Telemetry Channels - GME TX3500 Instruction Manual

iMpOrTANT iNFOrMATiON

the use of the citizen Band radio service is licensed in
Australia by the AcmA radio communications (citizens
Band radio stations) class licence and in new Zealand by
the ministry of Economic development new Zealand (mEd).
A General user radio licence for citizens Band radio and
operation is subject to conditions contained in those licences.
the class licence 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 thereby doubling the channel capacity and relieving
congestion in the uhF cB/Prs band.
original 40 channel wideband radios will 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

the mixing of narrowband and wideband radios in the
same spectrum can cause some possible operating issues of
interference and differences in levels of received volume.
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 best performance.
When an older wideband radio receives a signal from a new
narrowband radio, the speech may sound quiet –– simply
adjust your radio volume for best performance.
t X 3 5 0 0
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 moving up or down a
few channels from the currently selected channel.
the above situations are not a fault of the radio but a normal
symptom of operating wideband and narrowband radios in the
same bandwidth. this possible interference will decrease over
time as the population of wideband radios operating in the
uhF cB band ages and decreases.
Further information and updates are available from the
Australian communications and media Authority (AcmA) at
www.acma.gov.au 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 ch 5.
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 the
tX3500 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.
I n s t r u c t I o n m A n u A l PA G E 3