[Antennas] WTB: butterfly capacitor

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
> 
> 
> - - - 
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas
> 