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Basic ADS-B question re: Skyview (Read 1535 times)
Dec 5th, 2017 at 5:11pm

aerovin   Offline
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Regarding the discussion of the dual-band 472, I might be working with incorrect information. My understanding is that with ADS-B Out and the 1090ES transponders, traffic information is relayed directly between like equipped aircraft. I'm equipped with the SV-XPNDR-261 (and the ADSB-470 box for 978 traffic). I had thought that my Skyview D1000T will display 1090ES equipped ADS-B OUT traffic without the addition of the 472 box. Is this not correct?

I presumed (incorrectly??) that the 470 box gave me 1) FIS-B weather and 2) direct 978 traffic. Without that box, I would still get ADS-B traffic from other 1090ES aircraft and ADS-R rebroadcast traffic from ground stations with the 978 traffic and Mode C traffic. I did not consider the 472 box because it did not give me anything I didn't already have.
 
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Reply #1 - Dec 6th, 2017 at 6:17am

RayInGA   Offline
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You will not get direct traffic information from a 1090 out aircraft; it must come from a ground station.

The 470 receives on 978, which is primarily received from ground stations. Few aircraft transmit out on 978 but that number may grow as the deadline nears and those systems are less expensive than 1090 MHz out boxes (to date).

The only reason to upgrade to the 472 is to get aircraft to aircraft data on 1090 when not receiving from ground stations (think mid-west).
« Last Edit: Dec 6th, 2017 at 9:33am by RayInGA »  

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
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Reply #2 - Dec 6th, 2017 at 7:21am

rleffler   Offline
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aerovin wrote on Dec 5th, 2017 at 5:11pm:
I presumed (incorrectly??) that the 470 box gave me 1) FIS-B weather and 2) direct 978 traffic. Without that box, I would still get ADS-B traffic from other 1090ES aircraft and ADS-R rebroadcast traffic from ground stations with the 978 traffic and Mode C traffic. I did not consider the 472 box because it did not give me anything I didn't already have.


You're assumption is correct.  You're only missing peer to peer communications on 1090.  You should still receive the traffic, but with a little delay because it has to be rebroadcast.
 
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Reply #3 - Dec 6th, 2017 at 8:53am

airguy   Offline
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rleffler wrote on Dec 6th, 2017 at 7:21am:
aerovin wrote on Dec 5th, 2017 at 5:11pm:
I presumed (incorrectly??) that the 470 box gave me 1) FIS-B weather and 2) direct 978 traffic. Without that box, I would still get ADS-B traffic from other 1090ES aircraft and ADS-R rebroadcast traffic from ground stations with the 978 traffic and Mode C traffic. I did not consider the 472 box because it did not give me anything I didn't already have.


You're assumption is correct.  You're only missing peer to peer communications on 1090.  You should still receive the traffic, but with a little delay because it has to be rebroadcast.


Unless you're in an area where it cannot be rebroadcast - because the traffic is not being seen by radar, such as low-level or in the mountains, or offshore.
 
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Reply #4 - Dec 6th, 2017 at 10:12am

GalinHdz   Offline
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Or outside the USA.

Cool
 

N819PR
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Reply #5 - Dec 15th, 2017 at 1:47pm

lacy311   Offline
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I have a skyview and an altitude encoder. I am trying to wire the encoder to a Garmin GTX335. Any help would be would be good.
Lou Lacy
loulacy@gmail.com
 
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Reply #6 - Dec 15th, 2017 at 8:37pm

kellym   Offline
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lacy311 wrote on Dec 15th, 2017 at 1:47pm:
I have a skyview and an altitude encoder. I am trying to wire the encoder to a Garmin GTX335. Any help would be would be good.
Lou Lacy
loulacy@gmail.com

If you are using a separate encoder, it should communicate directly with the transponder. You need pinout wiring diagram for the Garmin and for the encoder.
Seems like a strange way to go, when you could have Skyview with Dynon transponder, with no need for separate encoder, and for significantly less money, and easier calibration.
 
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Reply #7 - Dec 15th, 2017 at 9:16pm

lacy311   Offline
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Since I have a newer Garmin transponder GTX335 can I not go directly from the skyview to the rs232 on the Garmin without having a separate altitude encoder?
 
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Reply #8 - Dec 16th, 2017 at 5:46am

rleffler   Offline
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lacy311 wrote on Dec 15th, 2017 at 9:16pm:
Since I have a newer Garmin transponder GTX335 can I not go directly from the skyview to the rs232 on the Garmin without having a separate altitude encoder? 


That would be a question for Garmin to see if that’s supported.
 
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Reply #9 - Dec 16th, 2017 at 10:22pm

jakej   Offline
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lacy311 wrote on Dec 15th, 2017 at 9:16pm:
Since I have a newer Garmin transponder GTX335 can I not go directly from the skyview to the rs232 on the Garmin without having a separate altitude encoder? 


Yes you can - the format from the Dynon is ‘seen’ by all digital transponders  Wink
 
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Reply #10 - Dec 26th, 2017 at 4:44pm

lacy311   Offline
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Garmin says ALT FMT 3 supports Shadlin/Icarus/ACk/ will the skyview support that same Format?
 
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Reply #11 - Dec 27th, 2017 at 1:52am

jakej   Offline
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Yep
 
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Reply #12 - Jan 10th, 2018 at 1:10pm

lacy311   Offline
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If you are using serial port 1 from the skyview to the rs232 in on a Garmin GTX335 you have one wire going to the 3 stranded wires on the GTX rs232 I can't find how to do the wiring
Lou Lacy
 
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Reply #13 - Jan 10th, 2018 at 4:51pm

jakej   Offline
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They are TX, RX & serial ground.  For Icarus Alt into the GTX I’d just use the TX (from Dynon port) to RX of the GTX & connect the serial ground to the Dynon ground. 
Remember to configure the serial ports on both units. Wink
 
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Reply #14 - Jan 14th, 2018 at 10:47am

Bob Bogash   Offline
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lacy311 wrote on Dec 15th, 2017 at 1:47pm:
I have a skyview and an altitude encoder. I am trying to wire the encoder to a Garmin GTX335. Any help would be would be good.
Lou Lacy
loulacy@gmail.com


Maybe this can be moved to a separate thread?

Angry
 
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