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Message-ID: <001a01c85d11$71691b40$0900a8c0@Lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <000501c85c3d$4fa2f820$0b01a8c0@weazle> <20080122135712.5D7C8F3862@smtps02.kuleuven.be> <4795FB87.1060805@yahoo.com>
Date: Tue, 22 Jan 2008 16:10:07 -0000
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Subject: Re: LF: Fenceline longwire
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Hi Mike the problem with this is it becomes a narrow band antenna which is
not what JB wants.....It also destroys its action as a "travelling wave"
antenna. It will then be a heavily top-loaded but very low "L" . It might
even be worse than as it is !! I dont know what happens if he uses
distributed loading, it then looks like a low-pass filter!!

Alan G3NYK

----- Original Message -----
From: "Mike WE0H" <we0h@yahoo.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, January 22, 2008 2:19 PM
Subject: Re: LF: Fenceline longwire


> What if JB put a big loading coil in the fence wire? I would think that
> would work just like our loaded short verticals...Sure there would be
> losses but we have losses in our transmitting antennas also.
>
> Mike
> WE0H
>
>
> Rik Strobbe wrote:
> > J.B. ,
> >
> > I simulated the fence wire with MMANA.
> > On HF (80m, 40m)  I got the expected (bi)directivity and low offset
> > angle.
> > But on 500kHz the horizontal pattern is almost omnidirectional and the
> > offset angle is 78 degrees.
> > It seems that (at least in theory) even 1200 foot is too short to be
> > long  on 500kHz ...
> > Or does MMANA not work properly ?
> >
> > 73, Rik  ON7YD
>