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Old April 17th 10, 04:53 PM posted to rec.radio.amateur.antenna
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Default Cophasing Two Full-Wave Loops?

On Sat, 17 Apr 2010 05:06:42 -0700 (PDT), WA2SI
wrote:

Visualize, if
you will, two wire Christmas tree shaped wire loops, 90 degrees from
one another, fed at the center of their bottom legs up abt 30'.


Hi Bert,

This is the design of Bellini and Tosi of 105 years ago. They fed it
through a goniometer so they could steer the beam angle. At the time
they were unconcerned with load Z as you could tune the final and
drive to accomodate that.

Some might say, "why not just mount a vertical?" Well, I have the 2:1
balun and I figured that the loop would be much quieter.


I'm not sure how you have come up with, or plan to come up with a 2:1
BalUn - not very common, and construction details may ruin
expectations for performance.

As for "quieter," that is a very common myth = t'ain't so.

As for other details, you only roughly describe the length of wire
involved (in only one dimension) and you say nothing of frequency -
except by inference in the 80M band. Such details impact Z
considerably if you want someone to supply you with that
characteristic.

73's
Richard Clark, KB7QHC


 
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