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Wingtip VOR antenna . . . a clearer picture

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Mar 28, 2012 12:51 pm    Post subject: Wingtip VOR antenna . . . a clearer picture Reply with quote
Thanks to List member van Saten, we've got some
better details for a DIY wingtip VOR antenna. See:

http://tinyurl.com/6v5gvhx

It seems that the sketch I was working from years ago
was either not up to date or in error.

The insulator turns out to be either glass or cloth
filled phenolic, 0.062 inches thick. The measured
value of an off-the-shelf gamma-match capacitor is
34 pf (at) 1 KHz.

I think the data above will get the builder closer to
a workable example of this particular antenna.

Thanks Don! Your antenna will be back in the mail today.
Bob . . .

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dsvs(at)ca.rr.com
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PostPosted: Wed Mar 28, 2012 3:25 pm    Post subject: Wingtip VOR antenna . . . a clearer picture Reply with quote
Bob,
Did you install the new cap or jhust test it by itself?

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JLuckey(at)pacbell.net
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PostPosted: Wed Mar 28, 2012 3:47 pm    Post subject: Wingtip VOR antenna . . . a clearer picture Reply with quote
Bob,

Thanks for this drawing. It gives me a general idea of what this thing is -
I could almost build one from it... A few more dimensions would be very
helpful. (or else I'll have to get out my trig calculator)

My wish list:

1. Explicit dimensions for length of each piece

2. A label for each piece. For us antenna ignoramuses (or is that
ignorami?) I cannot differentiate between the "antenna" and "ground strut".

3. Call-out fastenings and their positions. Are they critical? (e.g. can I
substitute a #4 machine-screw & nut instead of a 3/32 dia. aluminum rivet or
a #6 screw or a #8, etc?)

4. Some very explicit instructions about how to connect the feed line:
a. how to prepare the shield (I'm assuming a coax feed line)
b. type of wire terminals (or is it soldered?)
c. or can a coax connecter be installed on the antenna

5. How is the structure mounted in the airplane?
How did you measure the capacitance? As someone who knows nada about RF, a
spec like X pf at Y freq fascinates me..

Thx,

Jeff Luckey

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harrismarkr(at)hotmail.co
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PostPosted: Thu Mar 29, 2012 10:57 am    Post subject: Wingtip VOR antenna . . . a clearer picture Reply with quote
Bob

Ok now I have a problem ,at the weekend I made the VOR antenna to the dimensions previously discussed/aero electrics book I believe,these are very different to the ones shown on the previous link ,which should I use?

Thanks
Mark

Rent our beautiful 3 bedroom luxury villa in Orlando, Florida.
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On 28 Mar 2012, at 21:47, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:

Quote:


Thanks to List member van Saten, we've got some
better details for a DIY wingtip VOR antenna. See:

http://tinyurl.com/6v5gvhx

It seems that the sketch I was working from years ago
was either not up to date or in error.

The insulator turns out to be either glass or cloth
filled phenolic, 0.062 inches thick. The measured
value of an off-the-shelf gamma-match capacitor is
34 pf (at) 1 KHz.

I think the data above will get the builder closer to
a workable example of this particular antenna.

Thanks Don! Your antenna will be back in the mail today.


Bob . . .







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harrismarkr(at)hotmail.co
Guest
PostPosted: Mon Apr 02, 2012 10:28 am    Post subject: Wingtip VOR antenna . . . a clearer picture Reply with quote
Hi Bob

Thanks for the reply ref the differing dimensions of the VOR antenna.i am some way off flying but will run with the one already made and see how it performs.depending on the out come I can always try the other dimension antenna.

Thanks for all your help

Mark

Rent our beautiful 3 bedroom luxury villa in Orlando, Florida.
View our virtual tour but book direct with us. See the link below:-
http://www.florida1strentals.com/property.php?id=21
Contact Emma and Mark Harris 01582 529820
harrisfloridavilla(at)hotmail.com
On 28 Mar 2012, at 21:47, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:

Quote:


Thanks to List member van Saten, we've got some
better details for a DIY wingtip VOR antenna. See:

http://tinyurl.com/6v5gvhx

It seems that the sketch I was working from years ago
was either not up to date or in error.

The insulator turns out to be either glass or cloth
filled phenolic, 0.062 inches thick. The measured
value of an off-the-shelf gamma-match capacitor is
34 pf (at) 1 KHz.

I think the data above will get the builder closer to
a workable example of this particular antenna.

Thanks Don! Your antenna will be back in the mail today.


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
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