What I suspected here was that when the wire antenna was put up, sag was
minimal. Then it began to droop further as time went by. This is due
to the wire lengthening under load. I experienced this a lot in my
teenage ham days when I was using copper bell wire to build antennas.
And it does change the resonant frequency. Eventually I had to replace
the wires when they stretched to the breaking point. The other effects
of droop occur as well.
73, Erich
N6FD
On 12/31/2010 10:25 AM, 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. The capacity to ground
> is probably increasing as the wire droops toward the ground. I guess that
> would be one form of capacitive loading.
>
> Tod, K0TO
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|