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Re: [Amps] grid resonance

To: amps@contesting.com
Subject: Re: [Amps] grid resonance
From: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Reply-to: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 5 Aug 2006 11:19:14 +0100
List-post: <mailto:amps@contesting.com>
Tom W8JI wrote:
>
>> Tom W8JI wrote:
>>> A mobile whip loaded with a coil is a series resonant
>>> system.
>>>
>>> Are you saying a GDO will not dip on a mobile whip Bill?
>>
>> The bottom of the coil is connected to the chassis through
>> the low
>> impedance of the feed system.  The vertical radiator has
>> capacitance to
>> the chassis (of course it has inductance, too).  Sounds
>> parallel to me!
>
>So the loading coil is like a trap, and the coax sees an
>open circuit?
>
>The idea a GDO can sort "good resonances" that make low
>impedances from "bad resonances" that make high impedances
>seems pretty strange to me. Can you tell me how it does
>that, rather than just  finding some type of  resonance at
>the point where it is inserted?

Has anybody published a detailed analysis of how a GDO works?

Bill gave a good description yesterday, but I mean something that goes 
deeper and includes some verifiable math. 'Coefficient of mutual 
inductive coupling' ought to come into it somewhere.



-- 
73 from Ian GM3SEK

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