Date: Tue, 30 Mar 2010 10:53:58 +0200
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
In-Reply-To: <4BB1B7BB.1050708@iup.uni-heidelberg.de>
References: <MFEJIKCLCMPDFHOKMANAMEAFOFAA.paulc@snet.net>
 <4BB1B7BB.1050708@iup.uni-heidelberg.de>
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Message-Id: <20100330085352.16B2BF3862@smtps02.kuleuven.be>
Subject: Re: LF: RE: Re: PF per Meter  dependant on wire size?
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Paul, Stefan,

I you cannot put the coil at the top of the tower there is an 
alternative, see http://www.strobbe.eu/on7yd/136ant/#Tower

73, Rik  ON7YD - OR7T

At 10:35 30/03/2010, you wrote:
>Dear Paul,
>
>I have an idea. Take a photo of tower and the place where the coil will
>be placed and add some red lines (e.g. with MS Paint) to illustrate the
>wires. Then we can add some lines how we would do it :-)
>
>Can you use the tower itselt as the antenna? I mean, can you place the
>coil on the tower and bring some wires down to earth, taking the HV?
>That would be the effectivest way to radiate a signal since the most
>current will flow in the cable between earth and the lower end of your
>coil! It's like on LF, MF and HF, the effectiveness grows when the
>loading coils are places as far as possible from the feeding point (e.g.
>a short dipole or vertical).
>
>73, Stefan/DK7FC
>
>
>Am 30.03.2010 00:36, schrieb Paul A. Cianciolo:
> > Hi Jim
> >
> > Thank you for the formula for calculating "C" of a wire.
> > Also the information about adding additional wires is valuable.
> >
> > There are 2 methods I could try with my 55 meters of wire.
> > With the use of fiberglass spreaders, multiple wires could be spread apart
> > at the top of the tower forming a fan of the wires.
> > With a single point on the shack end where the wires would all would
> > combine.
> >
> > Probably better would be to support 4 wires equally spaced on a fiber glass
> > poles 9 meters long on both the tower end and the shack end.
> >
> > This seems too easy Jim, there must be a point of diminishing returns.
> >
> > Knowing that the wire is 55 meters long, and 1 wire measures at 
> 340 pf would
> > you hazard a guess as to 4 wires 1 meter apart each the value of "C"
> >
> > Do you think 700 pf is achievable?
> >
> > Thank you for reading
> >
> > PaulC
> > W1VLF
> >
> >