Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

ground planes - new source for copper foil and questions

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
prestonkavanagh



Joined: 27 Nov 2018
Posts: 16
Location: Tarpon Springs

PostPosted: Fri Jul 17, 2020 12:49 pm    Post subject: ground planes - new source for copper foil and questions Reply with quote

I have been working on a transponder antenna for a fiberglass airplane (Cozy IV). I tried thin copper sheet, then copper flashing. I hated the weight of the first one I built (and the Frankenstein look of the riveted, soldered seam), the second one was better and on the 3rd try I got a keeper. The reason is a new super thin copper foil. $14 bought 10 sheets, enough to make multiple transponder antennae. See
https://www.amazon.com/gp/product/B07R8BS843/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

The foil comes with a conductive adhesive backing, so I don't have to rivet and solder. The following were consistent measurements:
- internal resistance, multi-meter: 0.4 ohm
- resistance across face of sheet: 0.4 ohm
- resistance from face of sheet and across adhesive: 0.5 ohm

A package with 10 sheets weighs 201 grams, for weight per sheet of 20 grams (less than an ounce). The sheet size is 300 mm x 200 mm (11.81" x 1.87").

Are there optimal / resonant shapes and sizes for the ground plane? The bible calls for a circle with 5.5" diameter (p. 13-2). I can fit an 11" circle under the co-pilot seat of the Cozy. Stick with 5.5"?. And I believe I need a second, mirror image install for the ADSB. Is that right?

Thanks for the help. PK


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List



copper foil.JPG
 Description:
 Filesize:  106.97 KB
 Viewed:  1826 Time(s)

copper foil.JPG



_________________
PBK3
PA-12, BD-4, RV6a, gliders, Rutan canards
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group