Re: [IRCA] Beverage antenna downlead angle

["Neil Kazaross" <neilkaz@xxxxxxxxxxxxx>]

Chuck is correct that a slope to the ground rod or going straight across and 
then straight down should be the same and I have modelled it with EZNEC and 
it is close. However theory and practice can differ as you've found out and 
this is not an exact science in pratice. ie who knows what is being 
reradiated and picked up by a slope or the small straight downlead ? One 
would think the effect minimal, but when you are dealing with touchy things 
like a 15 dB side null dropping to 30 dB..well..there's like more inputs to 
the problem than a simple model can handle.

I can site my own experienced here when I used elevated mini-Bevs. Just the 
right and slight slope of the downlead to my rx made a nice difference in 
killing off semi-local WLIP 1050(15-20 deg) so I could have real fun on the 
288 deg mini-Bevs on 1050

73 KAZ
----- Original Message ----- 
From: "Patrick Martin" <mwdxer@xxxxxxxxx>
To: "Mailing list for the International Radio Club ofAmerica" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Thursday, June 21, 2007 11:53 AM
Subject: Re: [IRCA] Beverage antenna downlead angle


> Chuck,
>
> Thanks. Then, if you have a perfectly level beverage from end to end,
> let say 10 feet off the ground,  then how do you connect the coax and
> matching transformer at one end and terminate it at the far end without
> sloping it down?  You would get some vertical pickup no matter what you
> did. I guess on the matching transformer side you could connect the
> matching transformer, 10 feet off the ground and then bring the coax
> down, but on the far end, having a ground rod stuck up 10 feet is not a
> great idea. I guess a person is stuck no matter what they do.
> I have it sloped down about 4 feet to ground to the copper pipes at the
> far end over a period of about 50 feet.  But I am thinking of adding a
> couple ground rods over to just under where the wire comes over to the
> matching transformer on this side and physically move the antenna and
> matching tranformer up on the tree limb and just run the coax down the
> side of the tree, rather than sloping the beverage on this side. That
> would take care of and sloping on this end. The far end, I guess I
> cannot do much about that. Right now my ground rods on this side where
> the matching transformer is, it is about 3 feet over to the side. If I
> add a couple rods under where the beverage comes down, I can easily then
> add a bit of coax and physically move the matching transformer up on the
> limb and then go straight over with no sloping. What do you think?
> Comments?  I do have some sloping anyway as I had to raise it so the
> farm equipt. would ge through. So I am wondering my change on this end,
> would it make any difference?
>
> 73,
>
> Patrick
>
> Patrick Martin
> KAVT Reception Manager
>
- >
> 

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