Ground plane... I have some 10" x 11" sheets (4) of double sided copper on epoxy circuit board material, which I picked up for this purpose. These sheets are .022 inches thick, quite light.
I haven't looked up the right size, but I think it's about 9 inches in diameter. Someone else can chime in with that info. Free to whoever needs one, my KT76 is for sale on eBay, and I'm bailing out of the homebuilt business. Serge, one sheet is yours; send me a mailing address, and I'll mail it too you. Ron Freiberger mailto: rfreiber...@swfla.rr.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Serge F. Vidal Sent: Friday, January 16, 2004 6:39 AM To: kr...@mylist.net Subject: KR>Transponder ground plane Just two words on the situation, otherwise you will not understand the question: I am in Tunisia, my KR2 is in France. I want to prepare my trip to go there, and I will make a few mods to the aircraft. So, I am now busy preparing parts, but I have no access to the aircraft now to check layouts, dimensions, etc. OK, here is the problem. The transponder currently installed is a Bendix King KT 76. The transponder antenna is probably a KA60. The antenna has been installed under the baggage compartment shelf. As we have debated a few months ago, this is very bad, because it probably frys my brains. So, I want to move the transponder antenna to is normal location: under the belly. And I also want to make a ground plane. And here are the questions: - What is the correct size and shape for the ground plane? - How is the antenna mounted? How many holes, what size? How many contacts? - How does the antenna contact to the ground plane? Is it through its mounting washer? - I intend to make the ground plane with a sheet of aluminum foil, which will be reinforced by a sheet of Vinyl on top. Must I leave a large hole in the middle of the Vinyl, to allow the foil to make contact with the washer? - What can I use to glue the antenna plane to the floor? Is double sided adhesive OK? Is contact adhesive glue better? Or is it better to glue the foil to a hard sheet of plastic, and screw everything in place without glueing? Or is it better to cut the ground plane out of a thin sheet of aluminum (0.8mm is the thinnest I can get)? Serge Vidal KR2 ZS-WEC Tunis, Tunisia _______________________________________ to UNSUBSCRIBE from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/instructions.html
