Tom,
My gut tells me you are right. It seems intuitive that it would take an awful
lot of coupling to generate a useful dip on one of these analyzers. Thanks for
your thoughts. I would probably build the coupling link - not buy one - if I
were going to try it at all.
A few months ago I passed on an opportunity to acquire a dipper. Shouldn't have
let it go.
73,
Jim
---------- Forwarded Message ----------
FROM: "Tom Rauch" <w8ji@contesting.com>
TO: TowerTalk Post <towertalk@contesting.com>, Jim Idelson
<k1ir@designet.com>
DATE: Sun, 14 Jan 2001 19:43:48 -0500
RE: Re: [TowerTalk] CIA-HF as grid-dipper?
Hi Jim,
> I own a CIA-HF and I've been using it for a variety of antenna
> measurements. I am interested in using it as a grid-dipper with an
> inductive coupling to a coil or trap. Can you suggest how to use the
> CIA-HF in this application? What should I use for a coupling link?
All analyzers like this, including the MFJ, really have no sensitivity
at all when used as a grid dip meter.
In a conventional dipmeter, the coil is part of a tank circuit. The
magnetic flux around the coil is extremely high because the
operating Q of the coil is extremely high (part of an oscillator).
In an antenna analyzer, the Q is low. There is little flux around the
coil, and it couples poorly to anything you measure.
Personally, I think all these dip kits for analyzers are a waste of
money.
73, Tom W8JI
w8ji@contesting.com
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