Go with two GPS antennas
A few follow up questions:
1. If I installed the 175, can the GDL 82 GPS antenna signal be split to support both units or would I need another GA 35 GPS antenna.
3. If I went with the 375 assume I could reuse the GDL 82 and GTX 327 antennas but would I need another antenna for the ADSB In (the 375 installation guide only shows one xponder antenna)?
Thanks
Figs
Figs,
Where the GDL82 and both the 175 and 375 use the same GPS antenna, it is really not good to share that antenna. There are a few GPS antenna splitters on the market, but if you get a weak signal because it goes through a splitter, and you position drops to many times, you will get a letter from the Feds that you are not in compliance and will be told to fix it, and if you don’t do it in 45 days, you will be put on a naughty list. Yes, there is one. It is just easier to mount both antennas.
As for the 375, there is only one transponder antenna connected to the unit, and it uses that antenna for both out and in.
I did install a 375 a year ago in a friends RV6, and it works fine for both in and out using just the one transponder antenna.
If I needed to do this again, and money was not a restriction, get the 375, use the same GA35 antenna, and transponder antenna, and sell the GDL82 and the GTX327.
Note, if you really want to spit the GPS signal, go to eBay and look for GPS Splitters. Many listed. They do work, but are they worth the pain you might get if they don’t?
Good luck.