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  #1  
Old 01-01-2019, 04:06 PM
azflyer21 azflyer21 is offline
 
Join Date: Nov 2016
Location: Scottsdale AZ
Posts: 169
Default Archer Antenna Wingtip Install Questions

I can sure use a little guidance on installing the Archer antenna in the wingtip.

-How did you mount the antenna?
-How is it connected to the coax?
-Once the wing is installed is it difficult to route the coax thru the fuselage?

Thanks!
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Zenith 750 completed 2016 -
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  #2  
Old 01-01-2019, 04:51 PM
mgomez's Avatar
mgomez mgomez is offline
 
Join Date: Mar 2005
Location: Northern California, USA
Posts: 537
Default Not flying yet, but...

I glassed the antenna strips to the inside of the wingtip. I screwed a clamp inside the antenna for the coax. Then I ran the coax along spanwise through the rib lightening holes, secured with Adel clamps. My wings were off, and in fact had a skin panel yet to be installed.
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Redwood City, CA
"My RV-7 is a composite airplane: it's made of aluminum, blood, sweat, and money"
RV-7 Slider QB
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  #3  
Old 01-01-2019, 05:18 PM
BobTurner BobTurner is online now
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,858
Default

Quote:
Originally Posted by azflyer21 View Post
I can sure use a little guidance on installing the Archer antenna in the wingtip.

-How did you mount the antenna?
-How is it connected to the coax?
-Once the wing is installed is it difficult to route the coax thru the fuselage?

Thanks!
Identify the "radiating leg" (diagonal piece, which then turns and runs back); the "ground leg" (straight piece parallel the the backwards running radiating leg); and the "feeder/matching network leg" (short diagonal piece, with a parallel capacitor built into it.
The ground leg needs to be mounted, physically and electrically, as close as possible to the end rib. Method (1): Before mounting nut plates to the wingtip (or remove them if already done), place the ground leg between the wing tip and the nut plates; match drill wingtip and antenna ground leg at all places. Rivet wingtip - ground leg- nut plate. Remove all paint from the wing under the attaching screws, so there is a good ground leg to wing metal to end rib electrical connection, at many places along the ground leg. Method (2): Rivet an "L" shaped piece of aluminum to the end rib, as long as the ground leg of the antenna. Rivet the ground leg to the L shaped aluminum, at numerous points along the leg. I oriented this stuff to put the leading edge of the antenna behind the landing and nav/strobe lights, and aft of the aluminum foil heat shielding - maybe 8" or so back from the front. All of the lighting wires ran well forward of the antenna. With method (1) the antenna comes of with the wingtip - I left enough slack in the coax so I flip the wingtip over onto the top of the wing. With method (2) the wingtip will stay on the wing when you remove the tip - probably a bit better.
Connecting coax: follow Archer instructions. Center conductor goes to the parallel plate capacitor (electrically dc isolated from everything); braid/shield goes further inboard on the matching leg, to the piece that is electrically connected to the ground leg.
I have a -10 so cannot comment on cable routing, but had no problem with the -10.
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  #4  
Old 01-01-2019, 05:23 PM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,046
Default

Photos here:https://turnerb14a.blogspot.com/2018...ntenna-in.html

I used a solder sleeve to connect shielding to the antenna, some strips of glass/epoxy to stabilize the antenna. Since I have to run a cable all the way out to wingtip at a later date, I used a BNC connector at the wingtip and ran cable in fuselage with enough length to run out to wingtip. I followed instructions that came with antenna very closely, replaced some of the original wingtip nutplates after match-drilling holes to the antenna. If you don't have instructions, you can find them here: https://www.aircraftspruce.com/catalog/pdf/SA001.pdf
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Last edited by mturnerb : 01-01-2019 at 05:27 PM.
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  #5  
Old 01-01-2019, 07:46 PM
Carlos151's Avatar
Carlos151 Carlos151 is offline
 
Join Date: Jan 2008
Location: Lebanon, TN
Posts: 156
Default +1 for a good ground

Quote:
Originally Posted by BobTurner View Post
The ground leg needs to be mounted, physically and electrically, as close as possible to the end rib. Method (1): Before mounting nut plates to the wingtip (or remove them if already done), place the ground leg between the wing tip and the nut plates; match drill wingtip and antenna ground leg at all places. Rivet wingtip - ground leg- nut plate. Remove all paint from the wing under the attaching screws, so there is a good ground leg to wing metal to end rib electrical connection, at many places along the ground leg.
Like Bob mentioned, a good ground is key and having the full length of the antenna base leg sandwiched with the nutplates makes that happen. I attached the other legs of the antenna to the inner wingtip surface using several Clickbond base screws as well as installing a WDG clamp for the coax cable to a Clckbond screw. https://www.aircraftspruce.com/catal...?clickkey=9826

Routinely get 120nm plus lock on any VOR.
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RV-8
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  #6  
Old 01-01-2019, 08:30 PM
Sam Buchanan's Avatar
Sam Buchanan Sam Buchanan is offline
been here awhile
 
Join Date: Dec 2004
Location: North Alabama
Posts: 3,956
Default

Quote:
Originally Posted by azflyer21 View Post
I can sure use a little guidance on installing the Archer antenna in the wingtip.

-How did you mount the antenna?
-How is it connected to the coax?
-Once the wing is installed is it difficult to route the coax thru the fuselage?

Thanks!
This is my RV-6 installation from many years ago but maybe it will give you some ideas:

http://home.hiwaay.net/~sbuc/journal/sportcraft.htm
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1999 RV-6
1918 Fokker D.VII replica
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