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The frequencyand modesofoperation for eachHFsystemis controlledand monitored fromtheTopLevelpageofthe respective RTU, whichdisplays thefrequency, and modeofoperation. The HFline key onthelower right sideandthe rotaryfrequency tuningknobs are usedto selectthefrequencyand controlthe modeofoperation. <0060> Before transmitting,theantenna mustbetunedtothe selectedfrequencythroughthe antennacoupler. The couplertunestothe newfrequency whentheHFpush-to-talk (PTT) switchis pushed momentarily. Whenthe coupler is tuning, asteady1000-Hz tone is heardin theheadphone. The tone stops whenthe coupler is tuned. If afault occurs, abeepingtoneis heard. There are two main HFpagesHFCOMandHFPRESETforsystemoperations. These pagesare accessedin sequence from the top-levelpage when theHFline keyis pushed.The main pagesdisplaytheHF active frequencies, modesofoperation,and thepresetfrequency channels. The HFsystemis also coupledtotheSELCALdecoderto monitortheselectedHF frequencies for theaircraftuniqueSELCAL code.<0010><0011> The HFsystemsare also coupledtotheSELCALdecoderto monitortheselectedHF frequencies for theaircraftuniqueSELCAL code. <0010><0060> Flight Crew Operating Manual MASTER CSP A- 013
HF Radio Communication System REV 56, Jan 31/03
HF COUPLER 1 Dual HF Communication Interface Diagram <MST> Flight Crew Operating Manual MASTER
HF Radio Communication System REV 56, Jan 31/03 ACT LINE KEY Flight Crew Operating Manual MASTER |
