Welcome, Guest. Please Login or Register
Dynon Avionics, Inc.
 
Welcome to the Dynon Avionics forum!


  HomeHelpSearchLoginRegister  
 
 
Page Index Toggle Pages: 1
Send Topic Print
GPS redundancy for SV-261? (Read 855 times)
Apr 17th, 2018 at 11:24am

Craig Bennett   Offline
Junior Member

Gender: male
Posts: 89
**
 
The SV installation manual references that if you have a Dynon GPS 2020 that you do not NEED to have a direct GPS feed to pin 3 on the transponder. (My current config)  It does not address the question (I believe) of redundancy.

So in the unlikely case that the SkyView HDX1100 went dark but there was still power, will the transponder operate and could it have a GTN (planned upgrade) on pin 3 providing position information?

If the above is “yes” would you need to have the serial out on the GTN off until needed or would the transponder default to one or the other source if it was receiving both?

Thanks!
Craig
 
IP Logged
 
Reply #1 - Apr 18th, 2018 at 4:01am

jakej   Offline
Expert
Australia

Gender: male
Posts: 1549
*****
 
I know of an installation just like that - SV 2020 for ADSB out & a wire from the Gps to the Txpdr 261 ready to connect if wanted/needed.
IF the HDX screen went black but you still have power then the Txpdr will work & be controllable from #2 HDX or if only a single SV fitted then the Txpdr will continue to work in the last configuration before the screen went out, IMO highly unlikely.
 
IP Logged
 
Reply #2 - May 2nd, 2018 at 8:04pm

Craig Bennett   Offline
Junior Member

Gender: male
Posts: 89
**
 
Hey Jake

So am I reading this correctly?  The installation you’re referencing has “other” GPS always wired to pin 3 or is it switchable in the event of loss of Dynon provided positioning?

DYNON:  any input from the experts?
 
IP Logged
 
Reply #3 - May 3rd, 2018 at 6:49am

RayInGA   Offline
Senior Member
I love aviation!
Richmond Hill, GA

Gender: male
Posts: 445
****
 
Having configured both types of GPS sources, if your Garmin source were enabled via switch, you would also need to change the source within Skyview.

My system has the old GPS-250 as backup, which is wired in parallel for redundancy. This configuration does not require switching (I don't think) or reconfiguration.
 

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
IP Logged
 
Reply #4 - May 3rd, 2018 at 5:31pm

Dynon Avionics   Offline
Dynon Official
Dynon Technical Support

Posts: 12963
*****
 
So you wouldn't need to externally switch (I don't think - this is a corner case and not the envisioned usage), but you would need to reconfigure the transponder settings to switch over to the direct transponder GPS connection. Remember that this only affects ADS-B Out compliance and not any other aspect of system performance (IE, is it worth the additional complexity in the wiring, configuration, and procedures)
 

Please do not use Private Messaging on form to contact. For private support:
Email: support at dynonavionics dot com
Phone: 425-402-0433 (7am-5pm Pacific weekdays)
IP Logged
 
Reply #5 - May 7th, 2018 at 12:54pm

Steve W.   Offline
Expert

Posts: 986
*****
 
Dynon Avionics wrote on May 3rd, 2018 at 5:31pm:
So you wouldn't need to externally switch (I don't think - this is a corner case and not the envisioned usage), but you would need to reconfigure the transponder settings to switch over to the direct transponder GPS connection. Remember that this only affects ADS-B Out compliance and not any other aspect of system performance (IE, is it worth the additional complexity in the wiring, configuration, and procedures)


And how would you do that if the SV were OTS?  Does the XPDR have an automatic switch-over mode available?  If not, seems there isn't anything you can do if the EFIS goes dark, since that's your interface to the XPDR...
 
IP Logged
 
Reply #6 - May 7th, 2018 at 7:12pm

Craig Bennett   Offline
Junior Member

Gender: male
Posts: 89
**
 
Steve W. wrote on May 7th, 2018 at 12:54pm:
Dynon Avionics wrote on May 3rd, 2018 at 5:31pm:
So you wouldn't need to externally switch (I don't think - this is a corner case and not the envisioned usage), but you would need to reconfigure the transponder settings to switch over to the direct transponder GPS connection. Remember that this only affects ADS-B Out compliance and not any other aspect of system performance (IE, is it worth the additional complexity in the wiring, configuration, and procedures)


And how would you do that if the SV were OTS?  Does the XPDR have an automatic switch-over mode available?  If not, seems there isn't anything you can do if the EFIS goes dark, since that's your interface to the XPDR...


That was my take as well Steve - you lose your only SV display, you lose GPS position updates to the transponder.

It’s not a safety of flight type failure but I have a lot of serial ports on the GTN and I would like to use some of them wherever it adds value.  Wink

Craig
 
IP Logged
 
Reply #7 - May 8th, 2018 at 6:01am

RayInGA   Offline
Senior Member
I love aviation!
Richmond Hill, GA

Gender: male
Posts: 445
****
 
Why not configure the GTN as your primary source and have the GPS-2020 as backup. If the GTN fails, you can configure the 2020 in the EFIS. If the EFIS fails, you still have your position source.
 

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
IP Logged
 
Reply #8 - May 9th, 2018 at 9:12am

Steve W.   Offline
Expert

Posts: 986
*****
 
Craig Bennett wrote on May 7th, 2018 at 7:12pm:
Steve W. wrote on May 7th, 2018 at 12:54pm:
Dynon Avionics wrote on May 3rd, 2018 at 5:31pm:
So you wouldn't need to externally switch (I don't think - this is a corner case and not the envisioned usage), but you would need to reconfigure the transponder settings to switch over to the direct transponder GPS connection. Remember that this only affects ADS-B Out compliance and not any other aspect of system performance (IE, is it worth the additional complexity in the wiring, configuration, and procedures)


And how would you do that if the SV were OTS?  Does the XPDR have an automatic switch-over mode available?  If not, seems there isn't anything you can do if the EFIS goes dark, since that's your interface to the XPDR...


That was my take as well Steve - you lose your only SV display, you lose GPS position updates to the transponder.

It’s not a safety of flight type failure but I have a lot of serial ports on the GTN and I would like to use some of them wherever it adds value.  Wink

Craig


Well, you can't have two devices sending serial data at the same time on the same line into the XPDR, so you have to select one or the other, and the XPDR has to be configured correctly to receive the data (format, baud rate, etc.).

So how would you do that under your proposal?
 
IP Logged
 
Reply #9 - May 9th, 2018 at 10:18am

RayInGA   Offline
Senior Member
I love aviation!
Richmond Hill, GA

Gender: male
Posts: 445
****
 
The installation manual shows that your GTN would connect to pin 3 (RX) of the transponder, while pins 5 (RX) and 7 (TX) would connect to your EFIS(s).

If, when Skyview is configured to use an external GPS source, it does not send data to the transponder, it would work as proposed.

Dynon would need to answer the IF part.
« Last Edit: May 9th, 2018 at 10:18am by RayInGA »  

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
IP Logged
 
Reply #10 - May 9th, 2018 at 5:03pm

Dynon Avionics   Offline
Dynon Official
Dynon Technical Support

Posts: 12963
*****
 
So the transponder's listening behavior entirely depends on the software setting. So you could do this. You would need to reconfigure that setting, though, which is something you should really do in between flights.
 

Please do not use Private Messaging on form to contact. For private support:
Email: support at dynonavionics dot com
Phone: 425-402-0433 (7am-5pm Pacific weekdays)
IP Logged
 
Page Index Toggle Pages: 1
Send Topic Print