[TowerTalk] 160m. Inverted L question

[David Gilbert]

Hi, Jim.

That's not what I meant, and I think you probably know that.  But yes, I 
should have been more precise like I often preach.  ;)

What I meant was in the context of my comparison to elements for 
different bands on a tribander.  Certainly grounded vertical elements 
have resonance different than if they weren't grounded, but the coupling 
between a grounded tower adjacent to a vertical fed against ground isn't 
conceptually any different than than the coupling between adjacent 
elements that are not grounded.  Lots of hams think there is something 
mystical about "RF ground", and I was just trying to head that off.

73,
Dave   AB7E


On 1/16/2019 12:17 PM, Jim Brown wrote:
> On 1/16/2019 11:04 AM, David Gilbert wrote:
>> The fact that the tower is grounded is irrelevant.
>
> That's not true. It matters a lot. Compare a 125 ft tower that is 
> insulated at the base with one that is grounded at the base. On 160M, 
> the grounded tower is near resonance, but nearly an open circuit on 
> 80M. And the tower insulated at the base is nearly an open circuit on 
> both bands!
>
> 73, Jim K9YC
>
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