I have used one for years. If adjusted no need for an ATU.
The dipole elements are matched by using twin speaker wire with a short
across both wires at particular distances, and only fed onto one the
pair, the other is a straight unbroken connection.
Inside the feed box of the G3TPW made antennas is a coax choke so no
need for an external choke or balun. I've worked over 200 DXCCs with
that antenna, at the moment I have one mounted at 35 feet and it works
really well. See www.m0pcb.co.uk for photos.
73, Iain M0PCB
On 31/05/2013 17:00,
[hidden email] wrote:
> Message: 8
> Date: Thu, 30 May 2013 22:51:59 -0500
> From: Tony Estep<
[hidden email]>
> To: Elecraft<
[hidden email]>
> Subject: Re: [Elecraft] cobweb antenna
> Message-ID:
> <
[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Thu, May 30, 2013 at 9:47 PM, Lee Stephens
> <
[hidden email]>wrote:
>
>> >....never heard of the 'Cobweb' but....
> ===========
> Well, it's really the same thing as a halo, which in turn is the same thing
> as a dipole that's been bent into a circle (or in this case a square) and
> trimmed so that it's resonant after taking account of the proximity effect
> at the ends. It emits horizontally polarized radiation in all directions,
> and generally works fine. Several can be combined for an all-bander (see
>
http://www.g3tpw.co.uk/). If fed with coax, it will benefit from a coaxial
> choke mounted near the antenna.
>
> Tony KT0NY
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