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Glide Slope Antenna

 
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n395v



Joined: 10 Jan 2006
Posts: 450

PostPosted: Wed Apr 05, 2006 5:27 am    Post subject: Glide Slope Antenna Reply with quote

I am looking at the diagram of Bobs homemade glideslope antenna.

It is not clear to me whers and how the coax and shield attach to the two whiskers.

It will be going in a composite... do I need a ground plane???? If so how is this placed relative to the antenna?

Can the Nav antenna serve also as the Glideslope antenna?

Thanks


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PostPosted: Wed Apr 05, 2006 5:50 am    Post subject: Glide Slope Antenna Reply with quote

At 06:27 AM 4/5/2006 -0700, you wrote:

Quote:


I am looking at the diagram of Bobs homemade glideslope antenna.

It is not clear to me whers and how the coax and shield attach to the two
whiskers.

Shield to one side center conductor to other side.

Quote:
It will be going in a composite... do I need a ground plane????

Dipole antennas like those depicted for VOR and GS do not
need ground planes.

Quote:
If so how is this placed relative to the antenna?

N/a . . . see above
Quote:
Can the Nav antenna serve also as the Glideslope antenna?

Yes, there are couplers you can purchase to steal a
GS signal off the Nav antenna. They're about $80

Bob . . .


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n395v



Joined: 10 Jan 2006
Posts: 450

PostPosted: Wed Apr 05, 2006 9:19 am    Post subject: Re: Glide Slope Antenna Reply with quote

Quote:
Yes, there are couplers you can purchase to steal a
GS signal off the Nav antenna. They're about $80 Bob . . .

Thanks

do not archive


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PostPosted: Wed Apr 05, 2006 12:29 pm    Post subject: Glide Slope Antenna Reply with quote

Hi Bob,
Where would I find the GS antenna diagram that is referred to here?

Richard Dudley

Robert L. Nuckolls, III wrote:

Quote:


At 06:27 AM 4/5/2006 -0700, you wrote:



>
>
>I am looking at the diagram of Bobs homemade glideslope antenna.
>
>It is not clear to me whers and how the coax and shield attach to the two
>whiskers.
>
>

Shield to one side center conductor to other side.



>It will be going in a composite... do I need a ground plane????
>
>

Dipole antennas like those depicted for VOR and GS do not
need ground planes.



> If so how is this placed relative to the antenna?
>
>

N/a . . . see above


>Can the Nav antenna serve also as the Glideslope antenna?
>
>

Yes, there are couplers you can purchase to steal a
GS signal off the Nav antenna. They're about $80

Bob . . .









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PostPosted: Wed Apr 05, 2006 6:35 pm    Post subject: Glide Slope Antenna Reply with quote

At 04:20 PM 4/5/2006 -0400, you wrote:

Quote:


Hi Bob,
Where would I find the GS antenna diagram that is referred to here?

The diagram we've been discussing is Figure 13-13 in the
'Connection. Finding someplace to mount such a beast is the
hard part. I think I'd go for the coupler approach. Or, if
you have a fiberglass airplane, try sticking an 8" piece of wire
into a BNC connector and let it dangle out the back of the
GS receiver. When on the runway centerline, glideslope and
localizer signals are huge. You're looking right down the
"barrel" of a 5w transmitter from a couple miles away max.
A wet string would probably get you a good enough signal.
If a compromise antenna doesn't work, go for the coupler
from http://www.chiefaircraft.com and others. Looks
like this:

http://www.aeroelectric.com/Pictures/Antenna/CI_507.jpg

I'd much rather install a coupler somewhere than try
to find a 'nice' place to mount a stand-alone GS
antenna.

Bob . . .


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PostPosted: Thu Apr 06, 2006 4:00 am    Post subject: Glide Slope Antenna Reply with quote

My GS antenna is invisibly built into my left wing tip which is made of
fiberglass. Works. Made it from info in Bob's Connection book. MB antenna
also works and it is inside the engine cowling. Right wing tip has the VOR
antenna. Only antennas I have exposed (which are commercially built) are
the Com and Transponder. Indiana Larry, RV7

---


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PostPosted: Fri Apr 07, 2006 1:51 pm    Post subject: Glide Slope Antenna Reply with quote

Thanks, Bob.
RHDudley

Robert L. Nuckolls, III wrote:

Quote:


At 04:20 PM 4/5/2006 -0400, you wrote:



>
>
>Hi Bob,
>Where would I find the GS antenna diagram that is referred to here?
>
>

The diagram we've been discussing is Figure 13-13 in the
'Connection. Finding someplace to mount such a beast is the
hard part. I think I'd go for the coupler approach. Or, if
you have a fiberglass airplane, try sticking an 8" piece of wire
into a BNC connector and let it dangle out the back of the
GS receiver. When on the runway centerline, glideslope and
localizer signals are huge. You're looking right down the
"barrel" of a 5w transmitter from a couple miles away max.
A wet string would probably get you a good enough signal.
If a compromise antenna doesn't work, go for the coupler
from http://www.chiefaircraft.com and others. Looks
like this:

http://www.aeroelectric.com/Pictures/Antenna/CI_507.jpg

I'd much rather install a coupler somewhere than try
to find a 'nice' place to mount a stand-alone GS
antenna.

Bob . . .










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