Re: [IRCA] Beverage antenna downlead angle

["Chuck Hutton" <charlesh3@xxxxxxx>]

Patrick:

Comparing 10' to 1500' directly isn't the right thing to do: the horizontal
part of your wire is likely to extract only 5% tops of the energy from the
incoming wave while the vertical section is likely to be near 10 times more
efficient.

So your 10' can indeed have an effect. With 2 of them (one per end) you'd
find your non-directional pickup from the vertical to be approximately 16 dB
below the Beverage. This varies some with soil characteristics and arrival
angle. It also assumes a perfectly level Beverage.

Sloping makes no difference. 10' of vertical drop is 10' of vertical drop
regardless of whether it is straight down or sloped.


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of Patrick Martin
Sent: Tuesday, June 19, 2007 10:17 PM
To: irca@xxxxxxxxxxxxxxxx; am@xxxxxxxxxxx
Subject: [IRCA] Beverage antenna downlead angle

I have been expirimenting with the beginning of the beverage antenna on
how I should place the angle down to the ground where the matching
transformer is. I always though a soft slope down over 100 feet would
work the best with no sharp vertical angles. Well, in my case that idea
is not the best. Strange. I always sloped the wire down. The a couple
weeks back I was playing around with the wire monitoring the signal on a
portable and I found running it in more of a straight line and then "dog
eared" it down at the 45 degree angle to the branch and then on down to
the ground gives me a better pattern with less side lobes to the N/S.
Does that make any sense? It doesn't to me, but with the wet soil here
and other factors, a lot of things don't make sense.
We are only talking about 10 feet of wire sloping down, so with 1500',
it is just a small amount it should not make much difference, but it
does. I do slope down the wire to the ground rods on the far end. I have
not tried anything different there.

73,

Patrick

Patrick Martin
KAVT Reception Manager

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