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  #1  
Old 02-02-2013, 04:40 AM
Aiki_Aviator Aiki_Aviator is offline
 
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Location: Melbourne, Australia
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Default Trig 22 vs Dynon SV-XPNDR-261 Mode-S Transponder

Hi all,

I am in the final throws of my panel and I have hit a technical stumbling block.

I have been looking into the Trig-22 and thought basically it was the bees knees, however, I have now stumbled onto the SV-XPNDR-261 Mode-S Transponder.

Apart from the fact that it is a remote transponder I can't see if there are any other differences.

My research suggests that the Trig 22 has an inbuilt Altitude encoder, however, I am not sure about the SV-XPNDR-261 as it states it required a WAAS capable GPS to ensure full compliance come 2020 ADS-B requirements, and it doesn't say that it has a built in encoder.

Could someone shed some/any light on this as my panel will either have a cut-out or it won't and the space can be better used :-)

Thanks in advance.
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  #2  
Old 02-02-2013, 05:18 AM
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Walt Walt is offline
 
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The Dynon Skyview will control the SV-261, altitude data will come from the Skyview.

The Trig TT-22 requires the TC 20 controller (remote head unit) for operation. The TC20 has a built in altitude encoder.

Both the SV-261 and the TT-22 are ADS-B compliant transponders that will accept GPS data to compy with future ADS-B requirements.
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  #3  
Old 02-02-2013, 05:56 AM
Aiki_Aviator Aiki_Aviator is offline
 
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Location: Melbourne, Australia
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Default Follow-up

Hi Walt,

Thanks for the info, just to clarify, what is your understanding of the Altitude encoders function on the head unit; what is the benefit, given the Dynon unit does not have one.

Why would the Trig-22 require a GPS unit to become compliant.

Nothing on the Trig site suggrests a need for a GPS unit to be compliant.

Sorry, bit confused.

Andrew.
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  #4  
Old 02-02-2013, 06:10 AM
RV8R999 RV8R999 is offline
 
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Andrew -

All ES equipped mode-s transponders require a certified WAAS GPS position input for 2020 FAA compliant ADS-B OUT functionality. Without a GPS connection ADS-B OUT will not function. The Dynon xpdr has two connections for GPS input. One is via its serial connection to the SkyView allowing the Skyview GPS to provide position information (non-compliant however) and a dedicated GPs input connection for 3rd party GPS (compliant or otherwise).

The dynon transponder does not require an altitude encoder because as Walt pointed out, altitude information is provided by the Skyview Display via the serial connection.
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  #5  
Old 02-02-2013, 06:33 AM
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Brantel Brantel is online now
 
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Quote:
Originally Posted by Aiki_Aviator View Post
Why would the Trig-22 require a GPS unit to become compliant.

Nothing on the Trig site suggrests a need for a GPS unit to be compliant.

Sorry, bit confused.

Andrew.
Andrew,

Because a transponder without a GPS has no idea where it is and how fast it is traveling and in what 3D direction it is moving and that is the primary purpose of ADS-B out....
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  #6  
Old 02-02-2013, 07:58 AM
Aiki_Aviator Aiki_Aviator is offline
 
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Default No WAAS in Oz

Hi Guys,

Unfortunately, there is no WAAS in Australia nor will there be. Therefore I am concerned as to how it will satisfy the 2020 ADS-B mandate if a WAAS certified GPS is required. Presuming Australia goes the same way as US, but without a WAAS system.

So if I paraphrase, the Trig 22 can provide a certified altitude from the head unit, whereas the Dynon unit cannot.
The Dynon unit gets its Altitude info from the Skyview system.
Both units will require Certified GPS inputs to comply with ADS-B requirements, however, not necessarily WAAS enabled for lateral position and speed.

Does this sound right as it would apply to Oz?

Sorry bit late here in Oz. Hope I am making sense.
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  #7  
Old 02-02-2013, 08:07 AM
Jesse Jesse is offline
 
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I think this decision should boil down to whether you have a Skyview display or not. If you do, why would you want to clutter your panel with a control head when you have the Skyview? As mentioned, the encoder becomes a non-issue. While a GTX-327/330 gives easier access to squawk codes, the Skyview gives you automatic mode changing between flight and ground and you can easily see the status of the transponder in the screen you are always looking at. After flying behind the G900X for 50 hours or so, the more I can see and control via my Skyview the better I like it.
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  #8  
Old 02-02-2013, 09:15 AM
David Paule David Paule is offline
 
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For the Trig, what would be a suitable GPS for it, to be mounted on the avionics shelf?

Dave
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  #9  
Old 02-02-2013, 09:27 AM
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Jeff A Jeff A is offline
 
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Quote:
Originally Posted by David Paule View Post
For the Trig, what would be a suitable GPS for it, to be mounted on the avionics shelf?

Dave
From the Trig Installation Manual:

12.2 FAA 91.227 Compliance
The TT22 transponder can be connected to the following GPS units to form the basis of a 14 CFR 91.227 compliant ADS-B installation:
 Freeflight 1201 & 1204 WAAS/GPS Sensors
 NexNav MINI & NexNav MAX WAAS/GPS Sensors
 Garmin GNS 400W/500W series
For installations seeking certification to 91.227 or other applicable standards, additional compliance information is available on request from Trig Avionics Limited.
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  #10  
Old 02-02-2013, 09:28 AM
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Quote:
Originally Posted by David Paule View Post
For the Trig, what would be a suitable GPS for it, to be mounted on the avionics shelf?

Dave
Depends on if you want or need to become a fully compliant client for the ADS-B ground stations.

For now the FAA is allowing non compliant clients to wake up the ground stations.

To be a fully compliant client, you need a supported gps connected that meets the requirements of FAR 91.277/AC 20-165. Trig will tell you what is supported.

If you don't want or need to be fully compliant, you need whatever Trig supports that fills out enough of the ES data set to wake up the ground stations. you will need to ask them what that might be...
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Last edited by Brantel : 02-02-2013 at 09:36 AM.
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