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Re: [Amps] grid resonance

To: g3rzp@g3rzp.wanadoo.co.uk, amps@contesting.com, vic@rakefet.com,tonne@comcast.net, dezrat@copper.net
Subject: Re: [Amps] grid resonance
From: "Will Matney" <craxd1@verizon.net>
Reply-to: craxd1@verizon.net
Date: Sun, 06 Aug 2006 19:04:28 -0400
List-post: <mailto:amps@contesting.com>
Peter and Vic,

According to the HD-1250 Heath GDO manual, for measuring an unknown 
inductor I quote;

(1) Connect a low value capacitor across the unknown inductor; for example 
100 pF.

(2) Use the dip meter in the injection mode.

(3) By trial and error, find a coil that will dip on the resonant frequency of 
the 
'parallel' circuit. Record the frequency.

(4) Compute the inductance of the coil with the following formula: 

L = 1 / 39.48 x f^2 x C

Un-quote.

I think Ian wondered about a good book on these, I would recommend this 
manual as it has a ton of info. It's at Bama for any wanting to download it.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 8/6/06 at 11:48 PM Peter Chadwick wrote:

>Vic wrote:
>>Let's say I take a coil and connect a capacitor across it.  If I couple 
>RF into the coil from my GDO, I think you'll agree that it's a parallel 
>circuit.<
>No. The current induced in the coil is in series with the coil. So the
>whole thing is a series resonant circuit. Or Kirchoff is wrong.
>73
>Peter G3RZP
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