Garmin GIA 63 Installation Manual

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GIA 63 Installation Manual 190-00303-05Page 4-24 Rev. Y4.6 COM/VOR/ILS/Digital Audio4.6.1 COM/VOR/ILS/Digital Audio Function and Emergency ModeActivation of COM MIC KEY* enables COM MIC AUDIO and causes the transceiver to transmit.500Ω COM AUDIO and 500Ω VOR/ILS AUDIO are 100 mW audio outputs that are intended to drive aheadset or an audio panel. Digital audio outputs from compatible Garmin GMA series audio panels are3.87 Vrms into 150 ohms.For COM SW versions previous to 11.00:Momentarily depressing the COM REMOTE TRANSFER* button toggles the active and standby COMfrequencies. The COM REMOTE TRANSFER* input may also be used for EMERGENCY operation ofthe COM transmitter. If the remote transfer switch is depressed for two seconds, the active COMfrequency changes to 121.50 MHz. Once the emergency frequency is activated through COM REMOTETRANSFER*, the GIA 63(X) ignores inputs from the front panel controls for COM selections only. Thepilot may exit this independent mode—restoring COM selection control to the front panel knobs andbuttons—by momentarily depressing the COM REMOTE TRANSFER* switch.For COM SW Versions 11.00 and later:The behavior of the COM REMOTE TRANSFER key is configurable in the system configuration. It maybe configured to either toggle the active and standby COM frequencies (in which case it operates in thesame manner as described above for SW versions previous to 11.00), or enter emergency modeimmediately (i.e., tune the COM emergency frequency of 121.500 MHz). It can further be configured tobe either a momentary or latched switch.Momentarily depressing the VOR/ILS REMOTE TRANSFER* button toggles the active and standbyVLOC frequencies.(011-00781-0X and 011-01105-0X/-2X/-3X):When TRANSMIT INTERLOCK* is active, the GIA 63(X) COM receiver sensitivity is decreased. Thisinput is intended to reduce interference from other transmitters in the aircraft. The TRANSMITINTERLOCK* input should be connected to the PTT input of other transmitters in the aircraft. Ifconnected to multiple PTT inputs, these connections must include diode isolation or multiple radiostransmit simultaneously.(011-01105-4X only):The COM SECONDARY TX INTERLOCK* input provides a wired-OR connection with TRANSMITINTERLOCK* to eliminate the need for diode isolation if three COM transceivers are used. If more thanthree COM transceivers are present, diode isolation must be included externally.For digital audio installations, all of this information is transferred in the digital audio data stream.