[TowerTalk] Resonant Frequency - 40m Dipole

[Artek Manuals]

Stan

So many variables going to be hard to predict. Soil conductivity and 
drainage will be a much bigger variable than the models can always predict.

Put it up, measure the impedance at the feed point with a decent VNA and 
a calibrated ( to the VNA) feed line and keep good log book records. 
During dry spells and the rainy season

Depending on how from the ocean you are even the tides may affect it at 
certain critical heights

Dave
NR1DX

On 1/4/2021 9:10 AM, john at kk9a.com wrote:
> I do not think that this will be easy to estimate plus your coral 
> ground is different than the ground in Arkansas. Usually I pull my 
> antennas up in the air, test them while it is hanging from the rope 
> and bring it back down to the ground to make any adjustments.
>
> GL
> John KK9A
>
>
>
>
> Stan Stockton K5GO wrote:
>
> If any of you have built a coil loaded 40m dipole and can remember
> approximately how much higher in frequency it resonated when moved from
> 10-15 feet off the ground to a half wavelength or more, please let me
> know.
>
> Guess my memory isn't as good as I thought because I can't remember 
> exactly
> what happened when I built one and put it up at home a couple years ago.
> Whatever it was, as I recall, was not nearly the same as my model
> indicated. I've got more work to do but want to put it up soon.
>
> 73...Stan, ZF9CW
>
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Dave Manuals at ArtekManuals.com www.ArtekManuals.com

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