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Barry
Joined: 16 Sep 2008
Posts: 108
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 Posted: Fri Apr 13, 2012 5:52 am Post subject: ADSB In Coverage |
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I am trying to determine if the ADSB In only receivers will get the weather info from a broadcast tower all the time. I have heard that the tower needs to be in contact with a ADSB Out aircraft before it will send the weather info. Thanks Barry
[quote][b]
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jesse(at)saintaviation.co
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| Posted: Fri Apr 13, 2012 7:46 am Post subject: ADSB In Coverage |
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My understanding is that the weather is strictly a broadcast, with no response requirement from the ADS-B box in the plane. To get traffic, I have heard that some stations somehow require a response via ADS-B Out, but I don't know how they work that. I'm not an authority on the subject, but I thought I would share my understanding since there were no other responses yet.
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Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Apr 13, 2012, at 9:51 AM, Barry Marz wrote:
[quote]I am trying to determine if the ADSB In only receivers will get the weather info from a broadcast tower all the time. I have heard that the tower needs to be in contact with a ADSB Out aircraft before it will send the weather info. Thanks Barry
[b]
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Fri Apr 13, 2012 12:00 pm Post subject: Re: ADSB In Coverage |
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My understanding is that Jesse is correct.
Weather is just broadcast.
The ground station only sends out traffic that is near aircraft that it knows are listening. And it know they're listening only if they're sending an ADS-B signal out. If it knows about no aircraft listening, no traffic is sent. If another aircraft is near you AND that aircraft is sending out the ADS-B out signal, then the ground station will send out traffic that it knows about around that airplane, and you may get that information even though you're just listening.
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Bob Turner
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