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Re: [Amps] grid resonance

To: <g3rzp@g3rzp.wanadoo.co.uk>
Subject: Re: [Amps] grid resonance
From: "Tom W8JI" <w8ji@w8ji.com>
Date: Sat, 5 Aug 2006 10:16:30 -0400
List-post: <mailto:amps@contesting.com>
> Actually, the GDO won't measure a parallel resonant 
> circuit!
> Just consider what happens. We'll put a coil in parallel 
> with a capacitor, and couple (magnetically) the GDO to the 
> coil. The magnetic field from the GDO coil induces a 
> current in each turn of the coil to which it is coupled. 
> The current induced is in series with the coil, and so the 
> circuit is really a series resonant circuit, not a 
> parallel one. The same thing happens with link coupling to 
> a parallel L and C.

Careful Peter! The next thing you will be telling us is the 
GDO won't measure Q or impedances, and then some might 
realize what a nice house of cards can be built by misusing 
or misunderstanding basic test equipment.

73 Tom 


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