GME TX685 - Important INFORMATION CONCERNING Uhf CB Radio

TX6150/TX685 INSTRUCTIONMANUAL PAGE3
IMpORTANT INFORMATION CONCERNING uHF CB RAdIO
 TheuseoftheCitizenBandradioserviceislicensedinAustraliabytheACMA
Radiocommunications(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
 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.
 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.
 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radiohasa
transmit-inhibitappliedtochannels22and23.
 Intheeventthat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.