Garmin GTX45R Antenna

[tdldedcd]

Hi All,

For those using the Garmin GTX45R, what antenna are you using? There are several referenced in the Garmin manual, but I know Rami and several other companies have comparable antenna as well.

Curious to see what everyone is using.


Thanks.

Todd

[Shadowrider]

Comant. That was recommended by avionics shop….probably because they are pricey. ADSB data picks up great and works even far into the back country.

[Eric Page]

No need to spend Comant or Rami money. The $27 TED 104-12 antenna has been installed on thousands of airplanes with good success.

See this post for photos of how Phil did his transponder and ADS-B antennas. Mine are mounted inside my wings, but haven't been tested yet.

The transponder ground plane is a 5.42" diameter circle. If it's a little larger, no harm done. I made mine from galvanized flashing from the roofing section at Home Depot. See here.

If your system has a 978MHz ADS-B receiver as well, here's the TED 104-17 antenna for that. That ground plane would be 5.89" diameter.

[efwd]

I use the TED 104-17. Never had any issue. Except, I have broken one off so I'm on my second one so Im glad their inexpensive. I like the idea of inside the wing.

[Delta Whisky]

I mounted all of my antennas inside the fuselage and have had good results. Note the ground plane does not have to be round but I used the required radius as the minimum distance from the antenna connection to an edge in cutting something close to a square. I'm guessing that it doesn't make much difference in a cloth covered A/C if the antenna is up or down but I take the down convention as a good habit.

ADSB antenna.jpg

[patrick.hvac]

The garmin installation manual lists the acceptable antennas and their part numbers.
I know of someone using a Comant dual port CI 2480-201. Thats slick.
I am using a TED transponder antenna on the belly and a GA35 facing upward from under the turtle deck. Also on my second TED probe. Easily breakable but they are cheap.

Screenshot 2023-12-27 at 5.20.37 PM.jpg

[tdldedcd]

Thanks everyone for your input and help. I think I'm going to go with the Ted transponder antenna.

Patrick, I was thinking of doing the same thing for my GA35. Do you find it gets in the way while loading/unloading from baggage area? How did you mount it?

Todd

[patrick.hvac]

Thanks everyone for your input and help. I think I'm going to go with the Ted transponder antenna.

Patrick, I was thinking of doing the same thing for my GA35. Do you find it gets in the way while loading/unloading from baggage area? How did you mount it?

Todd

I have an avionics tray behind the pilot seat with remote radio/transponder and a couple other things. the top of the tray has an angle that puts the antenna in a similar spot to the ELT on the other side. It does not interfere with the baggage area at all.

[Pushboy]

Hey Patrick— do you have a photo of that tray? I’d like to see how you did that.

Dave.


Sent from my iPhone using Tapatalk

[patrick.hvac]

Here's one.
I know of two other planes with this tray so I think it's common.
I went back and lightened it up before cover.
With heavy nosed setups it helps to move things rearward anyway.

AVTRAY.jpg