Andre' Kesteloot akestelo@bellatlantic.net
Tue, 01 Dec 1998 23:34:00 -0500

Richard Dale wrote:

> >I would agree that 14 wire ribbon is a better starting point than 50
> >wire ribbon.  Also in ZL experiments have generally shown that
> >anything less than a metre per side (one square metre) loop is
> >insufficient aperture (as in capture area) for external noise to
> >outweigh internal noise (in the input device).  A BB212 varicap has
> Somewhere on the net I saw plans for such a loop, but the designer
> had shielded the entire loop, except for a small (< 2 cm or so)
> gap at the top of the loop.  The loop design was similar, using
> computer cable with the wires connected, save for the center wires
> which were used as the inductance loop.  He specified using copper
> foil, which could be found at hobby shops for use as roof material
> on toy houses.  That sounds like an expensive and tedious process
> to me.  Would aluminum foil work just as well?  What would be the
> needed dimensions for various loops up to, say, 1800 kHz?  How
> about shielding the leads going to the var cap and the ones going
> to the radio?
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