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  #1  
Old 10-31-2018, 03:23 PM
LeoKenner's Avatar
LeoKenner LeoKenner is offline
 
Join Date: Jul 2017
Location: Sherwood Park, AB
Posts: 27
Default 2 1/4 Transponder Question

Apologies if this is in the wrong section.

I am looking for an affordable transponder, preferably s mode, that will fit in 2 1/4 inch hole. Does anyone have any experience/recommendations?

The alternative would be that I modify my panel for a tray, but I would like to avoid that if there is a cost effective 2 1/4" option available.

Cheers
-Leo
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  #2  
Old 10-31-2018, 03:33 PM
chris mitchell chris mitchell is offline
 
Join Date: Jul 2006
Location: near Harrogate, England
Posts: 391
Default

Trig make just what you want, assuming you can get it in North America. Remote head, main section fits adjacent to antenna. Has AdDB out capability.

Chris
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  #3  
Old 10-31-2018, 03:41 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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I've been using TT22 Trig transponders for quite a few years both in my RV-6 and now in My Legend Cub. Both have worked flawlessly.
Also removing Garmin and installing Trig saved me several pounds.
Highly recommend.
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  #4  
Old 10-31-2018, 04:50 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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I'll second Mel's comments. Trig TT22 Mode S-ES transponder with TC20 control head. The control head fits in a 2 1/4" hole while the transponder itself has the same footprint as many altitude encoders. The neat thing is the TC20 control head IS the altitude encoder for this transponder!

Small size, light weight, small power draw and good price. I pulled a GTX330 from the panel in favor of the Trig equipment and don't regret it one bit.
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  #5  
Old 11-12-2018, 10:34 PM
lndwarrior lndwarrior is offline
 
Join Date: Mar 2015
Location: Cloverdale CA
Posts: 254
Default Code Input

Quote:
Originally Posted by Canadian_JOY View Post
I'll second Mel's comments. Trig TT22 Mode S-ES transponder with TC20 control head. The control head fits in a 2 1/4" hole while the transponder itself has the same footprint as many altitude encoders. The neat thing is the TC20 control head IS the altitude encoder for this transponder!

Small size, light weight, small power draw and good price. I pulled a GTX330 from the panel in favor of the Trig equipment and don't regret it one bit.
Sorry to jump in here but I've been considering the same thing. My question is have you found it an issue to input squawk changes in say bumpy weather or when things are busy in a class b with a lot going on?

I've only used the standard Tx where to code input is stupid simple. It seems like with a dial type input there would be a greater potential for mis-entries?

Exactly how to you input the code with the Trig unit?

TIA
Gary
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  #6  
Old 11-13-2018, 02:49 AM
dutchroll dutchroll is offline
 
Join Date: Jun 2010
Location: Sydney, Australia
Posts: 123
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Quote:
Originally Posted by lndwarrior View Post
Exactly how to you input the code with the Trig unit?

TIA
Gary
I have the TT22 in a Pitts and transiting military airspace at 1000' on a hot day to fly it to where the annual is done, it can get pretty bumpy. Changing code is no problem.

Starting to rotate the knob automatically flashes the first digit, and continuing to turn it changes the digit up or down with each click. Press the large enter button and it locks that digit in and advances to the next one which starts flashing.

You just rotate, press enter, rotate, enter, rotate, enter, rotate, enter. If the flashing digit is already correct, just press enter without rotating. It is actually a very quick process when you've done it a few times.

It gives you 7 seconds to make an input with the digit flashing before it defaults back to its previous code. I have it fine tuned to the point where I can have the code entered a couple of seconds after I finish my readback!
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Last edited by dutchroll : 11-13-2018 at 02:54 AM.
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