Garmin GNC 420A Installation Manual

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Garmin GNC 420A Installation Manual Manual pdf 44 page image

Page 4-16 400 SERIES INSTALLATION MANUALRev Q 190-00140-024.8 VOR/ILS INDICATOR (GNS 430 ONLY)4.8.1 VOR/ILS Indicator FunctionNOTEBecause the GNS 430 includes a “CDI” button that performs switching between GPS andVOR/ILS on a remote indicator, it is seldom necessary to use these outputs to drive anindicator. It is only necessary when it is desired for a separate indicator to displayVOR/ILS deviation full-time (regardless of the “CDI” button status).The VOR/ILS indicator displays both lateral and vertical, To/From indications, lateral and vertical flagsand superflags. GNS 430 connector P4006 always outputs the VOR/Localizer/Glideslope navigationinformation. The VOR/ILS pins on GNS 430 connector P4006 are used to drive an indicator that displaysVOR/ILS information at all times, regardless of the CDI selection on the GNS 430.VOR/LOC COMPOSITE OUT is a standard VOR/Localizer Composite output signal which may be usedto drive the Left/Right, TO/FROM, and Flag indications of certain navigation indicators that contain aninternal converter.The ILS ENERGIZE output goes low when the VLOC frequency is channeled to a localizer channel.4.8.2 VOR/ILS Indicator Electrical Characteristics4.8.2.1 SuperflagsPin Name Connector Pin I/OVOR/LOC SUPERFLAG P4006 15 OutGLIDESLOPE SUPERFLAG P4006 38 OutThe Superflag outputs supplies not less than 500 mA on a 28 volt system and 250 mA on a 14 volt systemwith the output voltage not less than (AIRCRAFT POWER - 3 VDC) when the flag is to be OUT OFVIEW. The output voltage with respect to ground is less than 3 VDC when the flag is to be IN VIEW.4.8.2.2 DeviationPin Name Connector Pin I/OVOR/LOC +LEFT P4006 5 OutVOR/LOC +RIGHT (VOR/LOC COMMON) P4006 6 OutGLIDESLOPE +UP P4006 32 OutGLIDESLOPE +DOWN/-FLAG (GLIDESLOPECOMMON)P4006 31 OutThe Deviation outputs are each capable of driving up to three 1000 : meter loads with r150 mV DC r10%with respect to 2.5V Common for full-scale deflection. The drive circuit provides for more than full-scaledeflection with a maximum course deviation output voltage of ±300 mVDC r10%.4.8.2.3 TO/FROMPin Name Connector Pin I/OVOR/LOC +TO P4006 1 OutVOR/LOC +FROM (VOR/LOC COMMON) P4006 2 OutThe To/From outputs are capable of driving up to three 200 : meter loads. When indicating TO, the outputis +225 ±75 mVDC. When indicating FROM, output is -225 ±75 mVDC. When invalid information ispresent (Flag IN VIEW) the TO/FROM output is 0 ±10 mVDC.