[Antennas] WTB: butterfly capacitor

Tue, 19 Mar 2002 08:07:53 -0600

Could a length of coaxial cable be used?  Like it is rated so many units of 
capacitance per foot.....don't know what the desired capacitance is...so 
don't know if the length of coaxial is practical.
Someting you might want to look into.

73 Jim wd4air

>From: STEPHEN C J BUNTING <[email protected]>
>To: Chris BONDE <[email protected]>
>CC: [email protected]
>Subject: Re: [Antennas] WTB: butterfly capacitor
>Date: Tue, 19 Mar 2002 08:31:17 +0000 (GMT)
>
>Hi all,
>
>As Chris points out HB trombone caps are quite easy to make from normal
>water pipe (copper) and an insulating material. Someone published this
>in one of the US magazines (QST - from memory) a few years back. The
>only problem is that this method will not produce the large amounts of
>capacitance required for some small low band loops. I built one and it
>worked just fine on my 20 - 10 m loop. If anyone is really
>interested I can rummage around and find a full reference for this (the
>authour was kind enough to send me a copy), or at a push, post some
>photocopies to the really desperate.
>
>73
>Steve
>M0BPQ
>
>-------------------------------------------------------------------
>Steve Bunting
>Neural Damage and Repair,		Tel 0207 848 6268
>Neuroscience Research Centre,
>King's College London
>Hodgkin Building			[email protected]
>Guys Campus
>London Bridge
>London
>SE1 1UL
>--------------------------------------------------------------------
>
>On Mon, 18 Mar 2002, Chris BONDE wrote:
>
> > The caps for loops.
> >
> > Now I am reaching to something that I did not pay enough attention to so
> > may be way off base, or maybe I just had a dream that I slightly 
>remembered.
> >
> > Isnot there a thing that is easily made out of tubing called a trombone
> > capacitor?
> > I think that a small step motor can adjust it, and, it takes high 
>voltages?
> >
> > Is this so and can it be used here.
> >
> > Chris opr VE7HCB
> >
> >
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