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  #1  
Old 09-22-2018, 02:40 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Default Mounting Dynon Skyview GPS-2020 Antenna

Has anyone noticed an interference with the GPS-2020 antenna wires passing through the F-1201Z retaining plate?

There is a large hole in the retaining plate but it is extremely off-center with respect to the wires protruding from the bottom of the Skyview GPS-2020 antenna. The wires actually interfere with the edge of the clearance hole and the aluminum plate can easily cut through the wire insulation.

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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 685

LSRM-A Certificate 2016 for RV-12 N633CM
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  #2  
Old 09-22-2018, 04:19 AM
Jamesey Jamesey is offline
 
Join Date: Feb 2008
Location: Hartlepool, England
Posts: 195
Default Cut a slot

Agreed. Just file out a small arc to make clearance. That?s what I did.
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  #3  
Old 09-22-2018, 06:25 AM
pilotyoung pilotyoung is offline
 
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Location: Birmingham, AL
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Default GPS 2020

I made the hole larger to give the wires clearance.
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  #4  
Old 09-22-2018, 07:44 AM
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Piper J3 Piper J3 is offline
 
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Default

I thought maybe I just had the problem. I sent an email to Van's Tech Support detailing the wire interference. Maybe Van's will issue a SB so folks make sure they address this before problems occur in the field.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 685

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #5  
Old 09-22-2018, 08:26 AM
benfra benfra is offline
 
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Location: ft MYERS, FL Based @KPGD
Posts: 35
Default Enlarged hole

I just enlarged hole, be sure to clean and de burr. Good luck!
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  #6  
Old 09-22-2018, 11:37 PM
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dbhill916 dbhill916 is offline
 
Join Date: May 2013
Location: Westerville, OH
Posts: 166
Default

Quote:
Originally Posted by Piper J3 View Post
Has anyone noticed an interference with the GPS-2020 antenna wires passing through the F-1201Z retaining plate?

There is a large hole in the retaining plate but it is extremely off-center with respect to the wires protruding from the bottom of the Skyview GPS-2020 antenna. The wires actually interfere with the edge of the clearance hole and the aluminum plate can easily cut through the wire insulation.
Ditto to the other responders. I found the hole to be off center/too small for the 2020, so I just used a Dremel tool to remove sufficient offending material to allow easy passage for the wiring bundle.

Don't forget to UPDATE YOUR SYSTEM to tell it that it's got a 2020 installed! I spent way too much time & money debugging a "bad" 2020 that was merely my fault for not following instructions.
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  #7  
Old 09-23-2018, 09:52 PM
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bruceh bruceh is offline
 
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Location: Ramona, CA
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Default

When I first installed the Dynon GPS-250, the wires that exited the unit were off center, so that's where I made the hole in the doubler. This last year, I upgraded to the GPS-2020 and lo and behold the wires are now centered. I did as others here suggested and just enlarged the hole in the doubler to make it centered for the new wiring exit. It was just about 1/4 to 3/8" off from the original unit. Makes me think that Dynon is the culprit here in moving the wiring on their units and Van's designed to the original offset hole.
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  #8  
Old 09-23-2018, 10:04 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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Question

Quote:
Originally Posted by bruceh View Post
When I first installed the Dynon GPS-250, the wires that exited the unit were off center, so that's where I made the hole in the doubler. This last year, I upgraded to the GPS-2020 and lo and behold the wires are now centered. I did as others here suggested and just enlarged the hole in the doubler to make it centered for the new wiring exit. It was just about 1/4 to 3/8" off from the original unit. Makes me think that Dynon is the culprit here in moving the wiring on their units and Van's designed to the original offset hole.
According to the Dynon documentation the old (250) and new (2020) units are identical and both have a small offset.

1.75 inches between mounting holes and the wires are 1 inch from set of holes.

Perhaps rotating the unit 180 degrees might help? The antenna does not have a mounting direction requirement.

Note, rotating the unit would move the position of the wires exactly 1/4 inch per your posting.
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  #9  
Old 09-24-2018, 01:03 AM
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Piper J3 Piper J3 is offline
 
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Default

What prompted me to start this thread? a friend?s RV-12 built by Synergy in Eugene, OR developed an intermittent GPS fault on Dynon dual screen HDX displays. Dynon was contacted because units are still in first year of warranty. Dynon theorized bad GPS antenna and sent a new replacement. When we changed out the antenna we noticed wire cut-through at the F-1201Z Retaining Plate. Synergy didn?t add clearance and just mounted the antenna with wires forced against sharp metal edge. At 80 flying hours a big red X was displayed on both EFIS screens, which was a little disheartening to say the least.

A big thank you to Dynon for stepping up to the plate, but real problem is poor build quality at Synergy. I?m sure Dynon will re-coop their cost now that we have full discloser. I suggest all owners of Synergy built aircraft should look for this assembly fault.
__________________
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 685

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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