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Sam Staton

Joined: 20 Oct 2009
Posts: 10

Posted: Mon Sep 05, 2011 5:55 am Post subject: Antennas

Bob & Listers et al -

     I think this may be my first post ever, after lurking for years! I 

am building an RV6, and I came into the project after it was very well 

along. This has posed some interesting issues with placement of 

components and such. I am in the design process now for the 

electrical/avionics suite, and need some advice. My avionics will 

consist of a Terra TX720D, TR200D, and a TriNav C for navigation. I will 

also have a King KY-97A for the second comm. My dilemma concerns the 

GS/VOR antennas. I'm pretty sure that I am going to build a dedicated GS 

antenna and mount it on the canopy glareshield. The VOR antenna is the 

issue. I have a splitter that will handle two VORS & two GS, but I 

believe I would need the longer antenna to use it. After all of this 

digression, I come to the question - if I mount a VOR antenna in the 

roof of the baggage compartment, how much loss will I incur if I bend 

the elements to follow the side of the fuselage? The wingtips are 

probably not going to be a good option, either - there will be an APRS 

J-pole antenna in one, at least. The illustration in the book seems to 

show the elements with a pronounced bend aft. If that will work without 

significant loss, that may be the answer. Most of my navigation will be 

by GPS anyway, so VOR is not the issue it would have been 20 years ago. 

Thanks in advance for all of the good info!



Sam Staton

Jacksonville, FL

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_________________
Sam
Jacksonville, FL

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Sep 05, 2011 10:27 am Post subject: Antennas

At 08:51 AM 9/5/2011, you wrote:

 	  Quote: 	
		  



Bob & Listers et al -

     I think this may be my first post ever, after lurking for years!


	


    Welcome to the party!



My dilemma concerns the GS/VOR antennas. I'm pretty sure that I am 

going to build a dedicated GS antenna and mount it on the canopy 

glareshield. The VOR antenna is the issue. I have a splitter that 

will handle two VORS & two GS, but I believe I would need the longer 

antenna to use it.



    Correct.



After all of this digression, I come to the question - if I mount a 

VOR antenna in the roof of the baggage compartment, how much loss 

will I incur if I bend the elements to follow the side of the fuselage?



    Unable to quantify in any terms that would

    be meaningful. A wet string will have some

    level of performance as an antenna. A laboratory

    grade, test range antenna will come very close

    to theoretical performance. All practical antennas

    fall somewhere between wet strings and the best-we-

    know-how-to-do. Just what you can settle for as

    "practical" isn't quantifiable.



    Suggest you consider the legacy 'cat whisker'

    antenna in the fin cap. This isn't ideal but

    has been a practical performer for 50 years.

    Further, at such time as you decide to eliminate

    VOR capability entirely, you'll have very little

    work to do on the airplane to make it look like

    the antenna was never there.



    Another option is the v-swept antenna mounted

    on the tailcone under the rudder.





   Bob . . .

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bicyclop(at)pacbell.net
Guest

Posted: Mon Sep 05, 2011 1:58 pm Post subject: Antennas

Just so you know, I've had the Bob Archer VOR       antenna in the left wingtip on our RV-6A for years and found it to       work just fine for both VOR and glideslope. The best part is that       it's not out in the wind or poking people in the eye.

       

       Ed Holyoke

     

     On 9/5/2011 6:51 AM, Sam Staton wrote:     [quote]-->       AeroElectric-List message posted by: Sam Staton       <pj260(at)bellsouth.net> (pj260(at)bellsouth.net)       

       

       Bob & Listers et al -       

           I think this may be my first post ever, after lurking for       years! I am building an RV6, and I came into the project after it       was very well along. This has posed some interesting issues with       placement of components and such. I am in the design process now       for the electrical/avionics suite, and need some advice. My       avionics will consist of a Terra TX720D, TR200D, and a TriNav C       for navigation. I will also have a King KY-97A for the second       comm. My dilemma concerns the GS/VOR antennas. I'm pretty sure       that I am going to build a dedicated GS antenna and mount it on       the canopy glareshield. The VOR antenna is the issue. I have a       splitter that will handle two VORS & two GS, but I believe I       would need the longer antenna to use it. After all of this       digression, I come to the question - if I mount a VOR antenna in       the roof of the baggage compartment, how much loss will I incur if       I bend the elements to follow the side of the fuselage? The       wingtips are probably not going to be a good option, either -       there will be an APRS J-pole antenna in one, at least. The       illustration in the book seems to show the elements with a       pronounced bend aft. If that will work without significant loss,       that may be the answer. Most of my navigation will be by GPS       anyway, so VOR is not the issue it would have been 20 years ago.       Thanks in advance for all of the good info!       

       

       Sam Staton       

       Jacksonville, FL       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

     [b]

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