Transponder confusion

[jbs007]

Hi all,

 

I will be updating the panel on my 66 E soon.  I want to get a 430W and a GTX 330 transponder.  I thought this would satisfiy the 2020 ADS-B requirements but the more I read I am not so sure.  Does 2020 require Mode S, "extended squitter", or are those the same thing? Does the GTX 330 hooked up to a 430W meet this requirement?  I see some that say "Mode S" and others that say "ES".  Thanks!

 

[Marauder]

The GTX 330 ES will meet the "out" portion of the mandate.

[takair]

Yes, you need ES to have ADS-B-out capability.

[DaV8or]

ADS-B out is what the "ES" is all about. You need the GTX 330ES. I do too, that's why I intend to ship my GTX 330 off to Garmin to become an ES.

[chrisk]

Hi all,

 

I will be updating the panel on my 66 E soon.  I want to get a 430W and a GTX 330 transponder.  I thought this would satisfiy the 2020 ADS-B requirements but the more I read I am not so sure.  Does 2020 require Mode S, "extended squitter", or are those the same thing? Does the GTX 330 hooked up to a 430W meet this requirement?  I see some that say "Mode S" and others that say "ES".  Thanks!

 

From Garmins page "If your aircraft flies at or above 18,000 ft over the U.S., or anywhere internationally, you will be required to use the 1090 MHz frequency using a Mode S Extended Squitter (ES) transponder — such as the GTX 330 ES."  and "Aircraft that only fly below 18,000 ft and only in the U.S. can opt instead for a dedicated 978 MHz Universal Access Transceiver (UAT). The 978 MHz UAT frequency will allow you to keep an existing Mode C transponder that you may already have."

 

http://www.garmin.com/us/intheair/ads-b/seven-questions/

 

So, I guess the short answer is you will need a 330ES, if you want a Garmin transponder that does ADSB-out.  If you want to keep your current transponder, I believe there is an add on solution (GDL88 maybe?).  --Why does this have to be so hard?  Is it just Garmin's marketing?

[Marauder]

From Garmins page "If your aircraft flies at or above 18,000 ft over the U.S., or anywhere internationally, you will be required to use the 1090 MHz frequency using a Mode S Extended Squitter (ES) transponder — such as the GTX 330 ES." and "Aircraft that only fly below 18,000 ft and only in the U.S. can opt instead for a dedicated 978 MHz Universal Access Transceiver (UAT). The 978 MHz UAT frequency will allow you to keep an existing Mode C transponder that you may already have."

http://www.garmin.com/us/intheair/ads-b/seven-questions/

The only box that will allow him to keep his mode C would be the GDL-88. And he would get the "in" piece if it can be displayed on the 430.

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[Bob - S50]

Or I think you can...

 

..get the King KT-74 for $2595 (made by Trig for King)

.. or the Trig TT31 for $2895 (mounting tray required and extra)

.. one of several remote mounted ADS-B transmitters

 

Just trying to muddy the waters.

 

Bob

[ArtVandelay]

Or I think you can...

 

..get the King KT-74 for $2595 (made by Trig for King)

.. or the Trig TT31 for $2895 (mounting tray required and extra)

.. one of several remote mounted ADS-B transmitters

 

Just trying to muddy the waters.

 

Bob

just to be clear, the 74 also requires a new tray if you want the ADS-B capability

[chrisk]

Or I think you can...

 

..get the King KT-74 for $2595 (made by Trig for King)

.. or the Trig TT31 for $2895 (mounting tray required and extra)

.. one of several remote mounted ADS-B transmitters

 

Just trying to muddy the waters.

 

Bob

I'll make the waters even muddier.  The source and transponder pair need to be approved.  

[jbs007]

Thanks guys!  This is getting more complicated than wedding planning...

 

I think I'll go 430W and GTX 330 ES and make sure the AVI shop knows I want 2020 compliance.  Although I never plan on going FL180 I think this will be the easiest option and hopefully not too expensive.  Ill Look around at KT-74s / TT31s too!

[Jerry 5TJ]

Mode S has been around for a while.  As in decades.  A more recent variation on Mode S is the ES or extended squitter mode. "Squitter" means to transmit a reply without an interrogation source, by the way.    A compliant Mode S ES transponder connected to a WAAS GPS source will meet the mandate for ADS-B Out for 2020.  We do have a choice in the USA and below FL180 to use UAT with ADS-B out (again coupled to a WAAS GPS) to meet that mandate as an alternative to the Mode S compliance path.  I plan to use the UAT path as the "C" won't reach FL180 in any useful manner.    Installing a mode S ES GTX330 in place of my current GTX327 might be the cheaper path (because I already have a WAAS GPS in the panel) but I prefer to get the other advantages of UAT.   

[ArtVandelay]

Mode S has been around for a while. As in decades. A more recent variation on Mode S is the ES or extended squitter mode. "Squitter" means to transmit a reply without an interrogation source, by the way. A compliant Mode S ES transponder connected to a WAAS GPS source will meet the mandate for ADS-B Out for 2020. We do have a choice in the USA and below FL180 to use UAT with ADS-B out (again coupled to a WAAS GPS) to meet that mandate as an alternative to the Mode S compliance path. I plan to use the UAT path as the "C" won't reach FL180 in any useful manner. Installing a mode S ES GTX330 in place of my current GTX327 might be the cheaper path (because I already have a WAAS GPS in the panel) but I prefer to get the other advantages of UAT.

You may not be flying at FL180, but will you be flying to Canada, Mexico, or Caribbean ? UAT is for US only.

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