[TowerTalk] Non-sagging antenna elements

[Roger (K8RI)]

On 12/31/2010 1:25 PM, Tod - ID wrote:
>> One thing to realize is that the resonant
>> point is changing because the wire is also getting longer as it sags.
>>
>> 73, Erich
>> N6FD
>
> I wonder if you mean that the apparent length of the wire is increasing
> Erich. I suspect that the actual length of wire is not really changing -- at
> least not significantly -- when the wire is sagging.
If the sag is due to stretching then the resonant frequency will change 
due to the length change.
> The capacity to ground
> is probably increasing as the wire droops toward the ground. I guess that
> would be one form of capacitive loading.
The antenna is effectively lower with a different shape and that would 
change not only the capacitance, but the antenna characteristics a tad 
as well.

73

Roger (K8RI)
> Tod, K0TO
>
>
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