Quote:
Originally Posted by SmilingJack
David, when you say "in and out" are you talking the Green Wire and White & Green Wires?
I'm installing one ts weekend and it appears to me the other "Orange Wire and White and Orange Wires" are not used.
Also, how did you get the transponder code to insert into the G3X so it will ignore it?
Thanks,
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Hello John,
Page D-12 (Appendix D) of the latest
G3X Installation Manual provides wiring and configuration information for installing a GDL39 with a G3X system. You are correct that this installation only requires using the Green and White/Green wires (plus power/ground).
If you are using a Garmin Mode S transponder like the GTX23ES, you will notice that normal setup of the transponder (using the XPDR page in config mode) will insert the Mode S Address for your aircraft on the ADSB config mode page. Nothing for you to do, this is automatic. G3X will then use this mode S address to make sure that your ownship is never misinterpreted as traffic.
Note that if you are using a panel mount Mode S transponder like a GTX330 or GTX330ES and do not have it selected on the XPDR config page, the Mode S Address field on the ADS-B config page can be manually edited to enter your Mode S address. The
FAA registration inquiry page shows the Mode S address for your aircraft in both octal and hex formats, both of which are supported on the G3X ADS-B config page.
Additionally, G3X systems automatically do something else really useful when using a GDL39. The GDL39 has an internal sensor to measure pressure altitude, but when used with a G3X system, the high accuracy pressure altitude measured by the G3X ADAHRS is passed over the datalink to the GDL39 so it will use the G3X pressure altitude instead of the pressure altitude measured by its internal sensor.
The single pressure altitude measured by the G3X ADAHRS is used for PFD altitude, transponder pressure altitude, and GDL39 traffic relative altitude determinations. Everything is highly integrated and in sync for this critical piece of information.
Let us know if you have any additional installation questions, but installing a GDL39 on a G3X system is very simple with just a single RS-232 interface.
Thanks,
Steve