Garmin GIA 63 Installation Manual
Also see for GIA 63: Installation manualInstallation manualInstallation manual
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Page 4-18 GIA 63 Installation ManualRevision T 190-00303-054.6 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 the GMA 1347 are 3.87 Vrms into 150 ohms.Momentarily depressing the COM REMOTE TRANSFER* button toggles the active and standby COMfrequencies. Momentarily depressing the VOR/ILS REMOTE TRANSFER* button toggles the active andstandby VLOC frequencies.The COM REMOTE TRANSFER* input may be used for EMERGENCY operation of the COMtransmitter. If the remote transfer switch is depressed for two seconds, the active COM frequencychanges 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.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.For digital audio installations, all of this information is transferred in the digital audio data stream.4.6.2 Com/VOR/ILS/DIGITAL Audio Electrical Characteristics4.6.2.1 Com Mic KeyPin Name Connector Pin I/OCOM MIC KEY* P601 4 InINACTIVE: 10 ≤ Vin ≤ 33VDC or Rin ≥ 100kΩACTIVE: Vin ≤ 1.9VDC with ≥ 75 uA sink current, or Rin ≤ 375ΩSink current is internally limited to 200 uA max for a grounded input4.6.2.2 Com Mic Audio, Intercom Mic AudioPin Name Connector Pin I/OINTERCOM MIC IN HI P601 5 InINTERCOM MIC IN LO (GROUND) P601 6 --COM MIC AUDIO IN HI P601 7 InCOM MIC AUDIO IN LO (GROUND) P601 8 --COM MIC AUDIO and INTERCOM MIC each have a 520 Ω AC input impedance and supply themicrophone with a 9 V bias through 620 Ω.COM MIC AUDIO is set in the factory for 275 mVRMS to modulate the transmitter at 80% nominally.The microphone gain adjustment is accessible through the top cover.When a 125 mV RMS signal at 1000 Hz is applied to the INTERCOM MIC input, the level on the COMAUDIO output is not less than 7.07 VRMS .DRAFT Rev T 11/12/2010 |
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