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Old July 6th 06, 07:10 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jul 2006
Posts: 757
Default Voltage feeding a VHF yagi


wrote:
Anyone ever get around the VHF FM vertical yagi feedline routing
problem by voltage feeding the bottom of the driven element with a stub
like a J-pole? A quick EZNEC run seems to indicate that it's not a bad
idea.

So it seems like it might work OK... but I wonder if anyone has
actually done it. Would you expect a coaxial stub to work better than
a parallel wire stub in terms of preserving the pattern of the yagi?

Any commercial products doing this?

73
Dan
N3OX
www.n3ox.net

I guess I'm missing it, but what problem is there
running the feedline to the normal center fed yagi?
No matter if against a mast, or mounted on a mast
with the center of the boom attached to the mast, I
don't see a problem. I do it all the time.
No matter what polarization, I tape the coax to
the mast, and then tape it to the boom to the feedpoint.
I'd much rather run the yagi in the normal manner.
Trying to voltage feed one sounds like a common
mode nightmare , unless drastic precautions were
taken. And I probably don't have to mention how
radiation from a feedline can skew a antenna pattern
real nicely...
MK

 
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