Re: [IRCA] Beverage antenna

["chris and anne" <tantwo@xxxxxxxxxxxxx>]

.......and all the antennas lived happily ever after...!          CRJ 
K4NHL
----- Original Message ----- 
From: "Charles A Taylor" <MWDXer@xxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Cc: "Steve Ratzlaff" <steveratz@xxxxxxxx>
Sent: Saturday, June 02, 2007 11:04 AM
Subject: Re: [IRCA] Beverage antenna




At 01:00 AM 6/2/2007 -0700, you wrote:

Patrick,

You just presented a real imponderable.

By your standards, my piddling wi'l antenna is something you would tear
down and burn.

In the spirit of experimentation (which is what my callsign is supposed
to be about), I wanted to access the far end of my former 65-foot long,
15 foot high longwire (orientation 135/315º).

It used to be 10 feet high, but to get it further away from a steel,
chainlink fence (installed without complaints by my 34-year old son)
that was totally messing up the gain of the antenna, I added (with a
whole world of fuss, tears and frustration) extra five-foot steel
mast sections to both end support masts.

This got it an extra 5 feet + from the fence, and really helped the
gain.

But I wanted, as in older days, to terminate the far end in a resistor
to make it "behave" better.

Brainstorm.

I took down the antenna and spliced a 14-foot vertical length at the
far end and terminated the antenna at 1 foot from the ground with a
little white "johnny ball" insulator. Did the same thing at the near
end.

Now I had a 93-foot (total) EWE antenna.

 From the moment I reconnected it to the receiver/antenna feedline,
I observed a very great difference in the gain and directivity of
the "new EWE."

Also, terminating the far end directly to ground (a 8-foot rod),
via a 470-ohm resistor, a 200-pF capacitor, a 200-uH coil and just
"floating" the far end, changed the directivity greatly, in some
instances.

Moral of the story: a vertical length of antenna can and will
profoundly affect the characteristics of a horizontal antenna.




   Charles A Taylor, WD4INP

  Greenville, North Carolina



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