Mounting GTX 345R

[BoilermakerRV]

Where and how are folks mounting their GTX 345R? I have a rough concept, but would like to hear from others (RV-7A slider). Pictures would be greatly appreciated.

[Mountain Time]

I?m putting a GTX45R into my 6 as part of a G3X Touch/GTN650 based panel upgrade, and I?ve been wondering the same thing - the other LRUs are small enough that finding a spot for them won?t be a problem, but the transponder is sizable enough that I?ve not yet come up with a good spot for it.

What say you experts who?ve gone down this path already?

[Mark33]

I?m installing the same unit in my -7 build. I don?t know the exact location that I?m going to install it yet but I think it needs to be in an area that?s readily accessible. Out of all the rest of the avionics installed, the transponder is the one piece of equipment that?ll need to be able to come out on a regular basis to get checked. I?m planning on fabricating a couple of hinged fold-down trays between the sub panel and the firewall on which to mount all of my remote mount avionics, but I think I?ll probably mount the transponder on the bottom side of one of the fold-down trays just so it?s easily accessible/removable.

Mark

[g3xpert]

One place that works pretty well is behind the subpanel directly behind the primary display. You can make a reinforcement ring in the subpanel and cut out the sub-panel for the transponder to slide through. The mounting of the transponder is the same as you would mount it in the panel, i.e. I would use aluminum angle on either side of the tray and create an anchor strap to the rear of the unit. The transponder can then be installed and removed through the display opening in the panel.

Thanks,
Levi

[Walt]

I like the aft baggage bulhead location on the 7/9 if possible. Running the wires can be a bit if a challenge on a flying aircraft so they go up front sometimes depending on the setup. I also like having the short antenna cable run when its all in the aft section. My own aircraft has the old 23ES on the bulkhead, easy to get to and works great.

Steve's location above is also a good one, but easier to do when building than retrofitting, so it all depends.

[Ian Coates]

I put mine underneath the VPX unit and attached it with small angle stock to the rails that were made as shown in the VPX installation, it sits sideways and slides in and out nicely.

[Mountain Time]

Good tips, gentlemen, I'll do some mockup next time I get to the hangar.

[CJ in EP]

Based on the information provided by Levi a few posts ago, this is how it worked out for my install:

View from the back of the sub panel


View at the front of the sub panel


I'm pretty happy with the result, and the harness on my Stein panel reaches perfectly in this location. Thanks for the tip, Levi!

[snoop9erdog]

Originally Posted by CJ in EP

Based on the information provided by Levi a few posts ago, this is how it worked out for my install:

View from the back of the sub panel


View at the front of the sub panel


I'm pretty happy with the result, and the harness on my Stein panel reaches perfectly in this location. Thanks for the tip, Levi!

Sent a PM to you Chris

[az_gila]

Originally Posted by Mark33

I’m installing the same unit in my -7 build. I don’t know the exact location that I’m going to install it yet but I think it needs to be in an area that’s readily accessible. Out of all the rest of the avionics installed, the transponder is the one piece of equipment that’ll need to be able to come out on a regular basis to get checked. I’m planning on fabricating a couple of hinged fold-down trays between the sub panel and the firewall on which to mount all of my remote mount avionics, but I think I’ll probably mount the transponder on the bottom side of one of the fold-down trays just so it’s easily accessible/removable.

Mark

Does it really have to be that accessible? The FAA-required transponder checks can be done with the unit in place - the only adjustments needed are for altitude encoding and they can be done by front panel programming I bet.