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Space-Based ADSB - Diversity required? (Read 559 times)
Apr 2nd, 2018 at 2:33pm

JoshT   Offline
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After SpaceX launched a bunch of Aireon ADS-B payloads, there's been some chatter about the ADS-B mandate in Canada.  Some of that said they might require antenna diversity so that the satellights could pick up your ADS-Out signal.

I think they are still in testing mode, so nothing for sure yet.

Got me wondering, is Dynon's -472 system even capable of driving two antennas?  Can you just use a splitter?  Or do you have to have two real outputs if they end up going that way?
 
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Reply #1 - Apr 2nd, 2018 at 4:05pm

Steve W.   Offline
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The 472 is ADS-B *IN*, not out.
 
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Reply #2 - Apr 2nd, 2018 at 5:17pm

mmarien   Offline
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We've been watching the satellite based ADS-B. The big concern is the antenna on top (satellite) and the bottom for ground based ADS-B. It's not a simple fix like a COAX splitter and doubles the cost of installing ADS-B. There have been some tests with regular ADS-B equipment with some good results.
 

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Reply #3 - Apr 2nd, 2018 at 6:42pm

KRviator   Offline
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Sydney, Aust.

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What's wrong with putting your transponder antenna on top of the fuselage? Short of a relatively small cone directly below your aircraft, it will still have line of sight to any ground-based receivers...
 
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Reply #4 - Apr 2nd, 2018 at 7:01pm

GalinHdz   Offline
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KRviator wrote on Apr 2nd, 2018 at 6:42pm:
What's wrong with putting your transponder antenna on top of the fuselage? Short of a relatively small cone directly below your aircraft, it will still have line of sight to any ground-based receivers...

Because RF wave propagation is so much more complicated than that. You can't even begin to answer the why on a forum like this so I won't even try. Just suffice that this idea isn't a very good option.

Cool
« Last Edit: Apr 2nd, 2018 at 7:03pm by GalinHdz »  

N819PR
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Reply #5 - Apr 3rd, 2018 at 7:11am

JoshT   Offline
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Steve W. wrote on Apr 2nd, 2018 at 4:05pm:
The 472 is ADS-B *IN*, not out.


Ah thanks for that, dumb mistake.  Discussion still applies for the transponder though.
 
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Reply #6 - May 15th, 2018 at 11:00am

Z-Air   Offline
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I'm in Edmonton, Ab.  Also hearing chatter that this is starting to work, one local guy said he saw his first ads-b traffic on the dynon about a month ago. 

My question is what are the requirements for working with the Aireon satellite system? I have the xsponder 261, not the 2020 gps, if upgrading my gps to 2020 and adding the 472 box will this make the system compatible with the aileron system?
 
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