TX4600 - GME

DUPLEX OPERATIONDuplex operation allows the radio to transmit on a differentfrequency to that which is receives. This allows operationthrough local repeater stations. These repeater stationsautomatically re-transmit your signal over a wider area,providing greatly increased range.Duplex operation is only available on channels 1-8 and 41-48.When duplex is selected on these channels, the radio receiveson that channel but actually transmits 30 channels higher.CTCSSOVERVIEwcTcSS (continuous Tone coded Squelch System) is asquelch quieting system that allows several groups of usersto share the same channel without disturbing each other.It uses a preset sub-audible (very low frequency) tone toopen and close the squelch on your radio. There are up to50 tones available in two optional tone sets. The systemapplies a continuous low-level tone to your transmissionand uses a matching tone decoder to control your receiver’ssquelch. With cTcSS enabled, the channel remains quietto all incoming signals unless they carry the correct tone.When a transmission with the correct tone is received, thesquelch opens and remains open for as long as the signal ispresent. When the transmission ends, the channel becomesquiet again. Transmissions that do not use the correct tonewill not be heard.The TX4600 allows cTcSS to be enabled or disabled onindividual channels.NoTe: The cTcSS tone you select will be used for all cTcSSenabled channels in your radio.MONITORING THE CHANNELIt is useful to be able to temporarily open your radio’ssquelch to allow you to listen for signals from other cTcSSusers outside your group. Because their cTcSS tone isdifferent to yours, your squelch would normally remainclosed, preventing you from hearing them. you can usethe SQL key to open the squelch and listen to the channelto check that it is clear before transmitting. This will helpprevent you from accidentally transmitting over the topof someone.To monitor the channelpress the SQL key. If there are no signals present, you willhear the usual hiss of an empty channel. press the SQL keyagain to restore the Squelch to its previous setting.SELECTING THE TONE SETThere are two standard tones sets available, one comprising50 tones and the other comprising 38 tones. Both tone setsare included in the TX4600 to provide compatibility withother GMe radio systems.SELECTING THE REqUIRED CTCSS TONETo preselect the cTcSS tone on your radio, please refer to theMenu settings on page 19.ENABLING CTCSS ON A CHANNELIf a cTcSS tone has been selected, it can be enabled onindividual channels.1. press the or keys to select the required channel.2. press and hold the SQL key. a high beep will be heardand ‘SILenT’ will appear on the display.you may activate cTcSS on as many channels as you wishexcept channel 5 which is designated for emergency use.DISABLING CTCSS ON A CHANNELrepeat steps 1 and 2 above. a low beep will be heard and‘SILenT’ will disappear.NoTe: you will not be able to activate cTcSS if the cTcSStone is set to ‘oF’.OVERVIEwSCANNINGThe TX4600 has a Scan function that allows groups of userprogrammable channels to be scanned for signals. channelscan be scanned at 20 channels per second. When a signalis found, scanning will pause on that channel to allow thesignal to be heard, then resume scanning when the channelis clear again.TX4600 INSTRUCTION MANUAL PAGE 7