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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