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Old October 16th 06, 03:07 AM posted to rec.radio.amateur.antenna
art art is offline
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Default Yagi Height Question

Now now Tony, be carefull in what you say and how you say it

If you placed several dipoles above each other in an array, say nine of
them within a height change of half a wave length, in line and each of
the dipoles/elements were resonant at the same frequency you are then
infering ......,at least I think you are,....... that the lowest
dipole/element will have the highest TOA, the next element in height
will have a lower TOA and progressively until one energises the top
element to get the lowest TOA of them all............ If that is what
you are saying........... then you could not be more wrong.
I am sure that those who are really knoweledgable in the field will
agree with me.
Ofcourse somebody lacking true knoweledge will produce a fake series of
radiation patterns for each element in the array but that is par for
the course on this newsgroup.
But then again often interpretations can be varied and thus in error if
so I apologise.
Best Regards
Art







Tony VE6MVP wrote:
On 14 Oct 2006 22:59:10 -0700, "
wrote:

That actually changes it a lot less than raising and lowering
significantly. HF yagis a wavelength or two above ground don't have
laser-like beams. The elevation pattern is set up substantially by
ground reflection, not only the antenna's free-space elevation pattern.


Gotcha. That makes sense.

Thanks, Tony


 
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