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Trig TT22 install in ASW

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soaringjac

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Oct 10, 2021, 11:20:55 PM10/10/21
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Looking to install a Trig TT22 in my ASW-28. Wondering how others did the install in their ships (27, 28, or 29). Did you install the remote unit behind the panel or did you install it behind the pilots head on the shelf?

2G

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Oct 10, 2021, 11:59:06 PM10/10/21
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On Sunday, October 10, 2021 at 8:20:55 PM UTC-7, soaringjac wrote:
> Looking to install a Trig TT22 in my ASW-28. Wondering how others did the install in their ships (27, 28, or 29). Did you install the remote unit behind the panel or did you install it behind the pilots head on the shelf?

Schleicher used the remote head for installation of a TT22 in my new 31Mi. It makes much more convenient to fit everything in a crowded panel that way. I didn't specify how to do it, just to install a TT22 and where it was to go on the panel.

Tom

Hank Nixon

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Oct 11, 2021, 7:51:18 AM10/11/21
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There is enough room in the '28 panel area to mount all up front. This saves a lot of time on install and wiring.
UH

soaringjac

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Oct 11, 2021, 9:47:46 AM10/11/21
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That is the plan so far for placement of the box, it will definitely save time with install and wiring doing it that way. I know there can be issues with length of antenna cables so was not sure if I would be running up against that limit running a long cable from the panel to back behind the main wheel.

John DeRosa OHM Ω http://aviation.derosaweb.net

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Oct 11, 2021, 10:59:48 PM10/11/21
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Soaringjac,

I installed a TT22 & TC20 in my ASW-27B last winter in an instrument hole at the very bottom of the panel.

The TT22 and TC20 are mounted to a L-shaped aluminum "frame" which is held in place by the TC20 head and a Filser FSG-71M mounted just above the Trig equipment. I used this type of frame held by instruments in several ships - works great. The TN72 GPS receiver is velcro'd to the top of the transceiver.

A few pictures are worth a thousand words. You can find them in a zip file here > http://derosaweb.net/aviation/ASW27/documents/TT22-Install

Drop me a line if you'd like more details.

Thanks, John (OHM)

PS - The transponder flat L2 antenna was installed by the previous owner in the tail's vacant battery box. Seems to work.

2G

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Oct 11, 2021, 11:05:30 PM10/11/21
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The box was mounted up front in my 31Mi as well, but it simplified the panel layout. You also have to mount the GPS antenna nearby, and it can't be shielded by the carbon fiber fuselage. The installation manual tells you how long the antenna cable can be, which depends upon the type of cable used. An RG393 cable can be up to 17' long and meet the 1.5db loss spec.
https://www.pasternack.com/images/productpdf/rg393-u.pdf
RG304 is a bit smaller and can be up to 12' 6" long:
http://www.ryanelectronics.com/Products/Wire_and_Cable/MIL_C_17/M17_112_RG304/

Tom

George Haeh

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Oct 12, 2021, 12:21:39 PM10/12/21
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John,

I finally gave up on installing an L2 antenna in the fin battery box.

Could you get the previous owner to tell us how he got the coax to the battery box

Dan Marotta

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Oct 12, 2021, 12:50:49 PM10/12/21
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How about putting a blade antenna on the belly behind the gear doors and
offset slightly to one side or the other?  I off set mine on my LAK-17a
slightly to the left where it was easy to see during loading into the
trailer.  Catching it on the trailer ramp was a non-issue.  Lots of
folks do it that way and it works just fine.  The increase in drag won't
mean a bit of difference to any but the top 2 or 3 contest pilots.

Dan
5J

Hank Nixon

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Oct 12, 2021, 12:56:41 PM10/12/21
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Very hard to do in Schleicher gliders. I did one. Not again. The mounting on the right side, accessed through the oxygen compartment
is easy an effective. This follows the Schleicher tech note.
UH

soaringjac

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Oct 12, 2021, 1:24:55 PM10/12/21
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Amazing! Thanks so much John, extremely helpful to see those images! Thats the exact setup I will have (trig on bottom, FSG 71M) on top. Assuming you custom made that harness where the wires come out at 90 degrees vs straight out the back? Great idea to do that in order to allow for the box to be closer to the control unit.

Dan Marotta

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Oct 12, 2021, 2:50:25 PM10/12/21
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A simple matter to open the connector shell and remove the harness,
drill an adequate size hole, and reassemble with the wires coming out at
90 degrees.  Actually, brilliant, I'd say!

Dan
5J

Mark Mocho

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Oct 12, 2021, 3:30:58 PM10/12/21
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A little off topic, but this video suggests that the drag from a blade antenna creates a significant amount of turbulence compared to the little rod and ball. Since much of out flying is somewhat uncoordinated (as when slightly sideslipping in thermals), the blade antenna may produce more drag than you think:

https://www.youtube.com/watch?v=8ii_UKzqsCE&t=134s

John DeRosa OHM Ω http://aviation.derosaweb.net

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Oct 12, 2021, 9:51:54 PM10/12/21
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On Tuesday, October 12, 2021 at 12:24:55 PM UTC-5, soaringjac wrote:

> Amazing! Thanks so much John, extremely helpful to see those images! Thats the exact setup I will have (trig on bottom, FSG 71M) on top. Assuming you custom made that harness where the wires come out at 90 degrees vs straight out the back? Great idea to do that in order to allow for the box to be closer to the control unit.

I do custom make all my harnesses so they are "just right" (whatever that might mean). One ingredient is the minimum length of the wires. I find pre-made harnesses are way too long for our compressed environments.

The shells for DB connectors come in three main varieties - 180 degree (most common), 45 degree, and 90 degree exit points. Take a look at slide 52 in my wiring presentation > http://aviation.derosaweb.net/presentations/#wiring

Best of Luck, John (OHM)

Richard Pfiffner

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Oct 12, 2021, 10:19:01 PM10/12/21
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ADSB information

Trig TT22/TN72 equipment /Airspeed Switch, Transponder antennas-coax, and custom wiring harnesses.

http://www.craggyaero.com/transponder.htm

Call for more customization

Richard
www.craggyaero.com

soaringjac

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Oct 13, 2021, 12:32:20 AM10/13/21
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Thanks Richard! I have already been checking out your site and info. I'll definitely be contacting you to purchase a few items.

Bob Gibbons

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Oct 13, 2021, 5:20:45 PM10/13/21
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On Sun, 10 Oct 2021 20:20:53 -0700 (PDT), soaringjac
<j...@scientifantastic.com> wrote:

>Looking to install a Trig TT22 in my ASW-28. Wondering how others did the install in their ships (27, 28, or 29). Did you install the remote unit behind the panel or did you install it behind the pilots head on the shelf?

Here is what I did to install a Trig TT22 and TN72 in my Ventus cT.

I used Solidworks to generate a solid model of an aluminum tray that
holds both Trig units and is captivated by my Kollsman altimeter in
the panel.

I used a company called Protocase to fabricate the tray. Cost in 2018
was $288 for two trays.

Google Drive has a folder which has a rendering of the complete
assembly, as well as photos of the tray and a zip file with the
Solidworks files.

https://drive.google.com/drive/folders/1xF0sR59QRc9EWy99jNphU_USNz7R1TFj?usp=sharing

Bob

son_of_flubber

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Oct 25, 2021, 9:53:34 AM10/25/21
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On Tuesday, October 12, 2021 at 3:30:58 PM UTC-4, Mark Mocho wrote:
> A little off topic, but this video suggests that the drag from a blade antenna creates a significant amount of turbulence compared to the little rod and ball. Since much of out flying is somewhat uncoordinated (as when slightly sideslipping in thermals), the blade antenna may produce more drag than you think:
>
> https://www.youtube.com/watch?v=8ii_UKzqsCE&t=134s

The drag from the slip would be many times greater than the drag from the blade antenna.

Mark Mocho

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Oct 25, 2021, 10:08:17 AM10/25/21
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> The drag from the slip would be many times greater than the drag from the blade antenna.

Agreed. But the point I am trying to make with this video illustration is that the blade antenna may produce more drag than the little rod and ball type unless it is precisely aligned with the airflow. I know the blade antenna has more drag on your bank account.
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