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Explain like I'm 5: Stratus + AXP340 + Skytrax

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paulr View Drop Down
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    Posted: 14 Jul 2016 at 9:05am
OK, I need some help figuring out how to properly configure my equipment, so please use small words and crayons if any drawings are required.

I have an IFD540, a SkyTrax 100, and an AXP340. The airplane passes the FAA ACR data quality check.

I sometimes fly with a Stratus1 so I can have weather, traffic, etc. on the iPad I use with Foreflight.

Routinely I will see traffic that appears on the IFD but not on the iPad, or vice versa.

How do I fix this so I see the same set of targets on both devices?
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MysticCobra View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MysticCobra Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2016 at 12:46pm
Since Stratus and SkyTrax use different antennae, it's always possible that one will be receiving from a tower and the other is not.  No way to "guarantee" you'll see the same targets on two devices unless they're fed by the same receiver.  

Additionally, the Stratus can receive direct (air-to-air) broadcasts from 1090ES-equipped planes, but the SkyTrax is only receiving on UAT (978MHz), so it's possible that you could be getting direct traffic reports from targets on FF that aren't available on the IFD.  (Not true for Stratus 1, as pointed out below.)

You can improve you chances by making sure your AXP340 is set to say that you're a UAT ADSB-in guy, so the towers will always broadcast to you on 978MHz.


Edited by MysticCobra - 14 Jul 2016 at 2:18pm
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ddgates View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ddgates Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2016 at 1:06pm
The Stratus 1 is single band, 978.

The Stratus 2 is dual band.

He says he has a Stratus 1, so his TXP needs to tell the ground 978 in only, as you said.




Edited by ddgates - 14 Jul 2016 at 1:08pm
David Gates
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MysticCobra View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MysticCobra Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2016 at 2:17pm
Whoops--missed the "1".  Thanks for the clarification.
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sikhpilotmd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sikhpilotmd Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2016 at 9:04pm
My stratus 2 and the MLB 100 traffic matches almost to a T
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