Interfacing with Trig TT21 Transponder

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dalemed
Posts: 5
Joined: Thu Jan 23, 2014 5:42 pm

Interfacing with Trig TT21 Transponder

Post by dalemed »

Has anyone displayed TIS data from the TT21 or TT22 on the GRT Sport EFIS? Any tricks I should know before I make my wiring harness?

Thanks in advance for any info.

Dale
Zenith CH650B
GRT_Jeff
Posts: 675
Joined: Tue Dec 11, 2012 12:11 am

Re: Interfacing with Trig TT21 Transponder

Post by GRT_Jeff »

Configure the TT21/TT22 for Garmin TIS output, and configure the EFIS Serial Input for GTX330. The TT21/TT22 has one baud rate selection that covers both GPS and TIS, so you'll have to make sure all the baud rates match up. If you can, configure everything for 9600, the usual TIS rate. The TIS data is only provided where a TIS radar uplink still exists. It will not work in an ADS-B-only area.
dalemed
Posts: 5
Joined: Thu Jan 23, 2014 5:42 pm

Re: Interfacing with Trig TT21 Transponder

Post by dalemed »

Thank you! Good info.
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Mel
Posts: 8
Joined: Sat Mar 07, 2015 10:37 pm

Re: Interfacing with Trig TT21 Transponder

Post by Mel »

Just up graded my TT21 to TT22. Sport EX controls the transponder.
Where in the menu can I input: Mode S Address, Flight ID, TIS Output, GPS System Int Level, Aircraft L&W, etc?
Mel - DAR since the last century
A&P, EAA Tech Cnslr/Flt Advsr
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel@icloud.com>
North Texas (8TA5)
RV-6 Flying Since 1993/Legend Cub purchased 12/2017
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Mel
Posts: 8
Joined: Sat Mar 07, 2015 10:37 pm

Re: Interfacing with Trig TT21 Transponder

Post by Mel »

Mel wrote:Just up graded my TT21 to TT22. Sport EX controls the transponder.
Where in the menu can I input: Mode S Address, Flight ID, TIS Output, GPS System Int Level, Aircraft L&W, etc?
Never Mind. I found it!
Mel - DAR since the last century
A&P, EAA Tech Cnslr/Flt Advsr
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel@icloud.com>
North Texas (8TA5)
RV-6 Flying Since 1993/Legend Cub purchased 12/2017
Bobturner
Posts: 432
Joined: Mon Mar 11, 2013 6:34 pm

Re: Interfacing with Trig TT21 Transponder

Post by Bobturner »

As Jeff noted, TIS data is available only in limited areas. I'd strongly recommend putting in one of the recommended ADSB-in boxes, well under $1K.
As a side note, the TT-21 is NOT approved for ADSB-out in the US. You need the higher power TT-22 for that.
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Mel
Posts: 8
Joined: Sat Mar 07, 2015 10:37 pm

Re: Interfacing with Trig TT21 Transponder

Post by Mel »

Bobturner wrote:
As a side note, the TT-21 is NOT approved for ADSB-out in the US. You need the higher power TT-22 for that.
Mid-Continent Instruments and Avionics currently offers an upgrade from TT-21 to TT-22 for $950 and includes a new 2 year warranty from Trig.
Mel - DAR since the last century
A&P, EAA Tech Cnslr/Flt Advsr
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel@icloud.com>
North Texas (8TA5)
RV-6 Flying Since 1993/Legend Cub purchased 12/2017
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