Matronics Email Lists :: View topic - Marker beacon antenna for composite aircraft

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Marker beacon antenna for composite aircraft

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

nuckollsr(at)cox.net
Guest

Posted: Thu Jun 14, 2007 4:44 pm Post subject: Marker beacon antenna for composite aircraft

At 04:25 PM 6/14/2007 -0400, you wrote:



 	  Quote: 	
		  Question, can anyone recommend a ground plane-less marker beacon antenna 

option for use in composite aircraft?



Thanks


	


   Sure. 40" of wire strung out and taped to the inside

   surface of your empanage.



   Bob . . .

- 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

nuckollsr(at)cox.net
Guest

Posted: Thu Jun 14, 2007 4:47 pm Post subject: Marker beacon antenna for composite aircraft

At 10:45 PM 6/14/2007 +0100, you wrote:



 	  Quote: 	
		  I m prepared to be shot down here by those who know more than me about 

antenna theory, but I have installed a 40 long piece of copper tape in a 

glassfibre wing tip for a beacon antenna & expect it to work. As beacons 

are reasonably powerful, and you (hope to) fly right over the top of them 

at short range, I believe a ground plane as such is not really required 

perhaps the screen of the feeder wire acts as a very small ground plane to 

complete the virtual circuit?


	


    "Ground plane" is not helpful at this range. You're just a few hundred

    feet above a 5w transmitter with a radiation pattern concentrated

    straight up. 40" of any kind of handy conductor . . . 22AWG wire

    is fine. If your marker beacon antenna input is on the back of

    some panel mounted device, then run a coax RG-400 or even the lowly

    RG-58 is fine to some handy place behind the seat and attach it to

    the 40" piece of wire.



    Bob . . .

- 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

Dave(at)AirCraftersLLC.co
Guest

Posted: Thu Jun 14, 2007 9:36 pm Post subject: Marker beacon antenna for composite aircraft

Bob,



Would that 40" piece of wire work outside a metal airplane if the conductor

was insulated from the skin?



I'm thinking of a wire or tape laminated to the belly between layers

fiberglass.



For that matter, could you laminate an Archer antenna to the bottom of a

metal plane and expect it to work?



If no, why not?



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA 

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com

--

- 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

longg(at)pjm.com
Guest

Posted: Fri Jun 15, 2007 5:30 pm Post subject: Marker beacon antenna for composite aircraft

40" of 22AWG wire it shall be. Any special needs for attaching it to the

coax? Solder? Duct tape? Insulate? I will be coming back from under the

panel. Ok if I epoxy (tack) the wire to the body so it does not move?



Thanks for the tip



--

- 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

Display posts from previous:

	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