[Amps] grid resonance

[Tom W8JI]

> 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? My meter largely sits 
unused. I hadn't turned it on in many years.

Is there a way to measure impedance and Q with it Vic?

73 Tom