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Ads-b
Bill
- William Mattson
- Posts: 63
- Joined: Sun Nov 06, 2011 7:23 pm
Re: Ads-b
I don't know about Mode-S for Canada but if you plan to fly into Canada I see a bigger issue with your plan and that is with regard to your ADS-B out. The GDL-88 uses the 978 MHz "Universal Access Transceiver (UAT) frequency. As you correctly noted this is fine for use under FL180. However... the UAT frequency has not been adopted by any country other than the US.
The true "universal" and ubiquitous world-wide standard for ADS-B out is 1090-ES or 1090 MHz "Extended Squitter" which piggybacks on the existing signal from a 1090 MHz transponder.
The GDL-88 will RECEIVE both 978 MHz UAT and 1090 MHz ES for ADS-B "IN" to display traffic on a compatible display but the GDL-88 only provides 978 UAT for the ADS-B "OUT". This means that you will be limited not only to staying under FL180 but also to staying within the continental United States.
Most avionics manufacturers have a pretty good write up on this. You can read about this on Garmin's website here -> http://www.garmin.com/us/intheair/ads-b/squit/
Notice on that page I reference above under the heading "ES Takes You Higher" it says (in part):
"...while UAT is limited to aircraft that will operate no higher than 17,999 ft MSL. So far, no country except the U.S. has accepted the 978 MHz UAT format for their ADS-B datalinks. Consequently, pilots who want to fly outside the U.S. — or operate at or above FL180 — will need the 1090 ES transponder for ADS-B “Out”..." (emphasis added in bold)
Thus if you plan to fly into Canada you will need a 1090-ES Out solution. If you are putting in a new Mode C transponder such at the Garmin GTX-327, I'd recommend you instead look at the GTX-330ES. It's more expensive but it's Mode-S and has the 1090-ES out built right in. It does require a WAAS GPS source which the GDL-88 already has built right in. The GDL-88 can still give you the "In" capability dual-band on both frequencies.
I would talk to your avionics shop / installer about where you plan to fly because once the ADS-B curtain falls (and that's happening earlier than 2020 in many countries) you won't be able to get outside the US with a GDL-88 978-UAT Out solution.
Good Luck,
- Charles
Charles Schefer- Posts: 563
- Joined: Mon Mar 12, 2012 7:09 pm
Re: Ads-b
Canada has also mandated 406 MHZ ELT's, but will allow US registered aircraft in their country without the 406 ELT's because they don't want to reduce the US tourists into their country. They basically say that if we meet US regulations, we are welcome.
They may take the same approach with ADS-B.
I believe that the Bahamas will also not want to limit US tourism.
Admittedly, it is a crap shoot, but certainly the GDL 88 allows us to get the benefits of ADS-B in and out in the US immediately, with the risk of having to buy some kind of 1090 transponder in the future, if we need it for foreign travel.
Ron Keil
- Ron B Keil
- ICS Secretary
- Posts: 7
- Joined: Sat Mar 06, 2010 2:10 am
Re: Ads-b
Thanks
- William Mattson
- Posts: 63
- Joined: Sun Nov 06, 2011 7:23 pm
Re: Ads-b
I know first hand of a lady whose husband died in the crash of their plane, it took 5 hours to find the crash site with a cell phone and an old 121.5 ELT. The wreck was up on the side of a mountain in the snow and trees in March, I think a 406 ELT would have led to a speedier recovery.
Clarence
- Clarence Beintema
- ICS member
- Posts: 134
- Joined: Tue May 11, 2010 11:41 pm
Re: Ads-b
Patricia Jayne (Pat) Keefer ICS 08899
PA-39 #10 Texas
N3322G- ICS member
- Posts: 1911
- Joined: Thu May 08, 2008 1:58 pm
- Location: Fort Worth, Texas area
Re: Ads-b
- William Mattson
- Posts: 63
- Joined: Sun Nov 06, 2011 7:23 pm
Re: Ads-b
So far I like the Stratus ESG unit very much. Looks great and very easy to work.
BobPicker- ICS member
- Posts: 21
- Joined: Thu Nov 04, 2004 3:02 pm