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Old March 14th 06, 01:59 PM posted to rec.radio.amateur.antenna
 
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Default Phase shift circuits


Harry Gross wrote:
I guess I'll have to break down, buy a copy of EZ-NEC and play with it:-)

By the way, are you suggesting that 90 degree rotation is all I'd need,
simply because the dipole radiation pattern is so wide, broadside to the
radiator? If that turns out to be true, then the problem becomes vastly
easier to deal with, and could even be done mechanically by simply
switching around the feed line to one dipole (easier to do with ladder
line - the preferred feed line to a dipole - than coax, of course)
although that might not be the BEST way to do it.


Harry,

If you feed 90- degree delay, the result is a basically omni pattern.
It has some ripples, but not much.

I think all you would ever be able to use is one antenna, the other
antenna, or both antennas together either in or out of phase.

I can't see any reason to do anything like rotate phase or control
ratio, since the effects would be so small.

73 Tom

 
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