If you want to make a 3 or 2 element array be bidirectional, tune the
parasitic elements to the driven frequency. Don't make it shorter or
longer. You can run that through EZNEC if you don't believe me.
73,
Dave AB7E
On 11/14/2021 3:16 PM, jim.thom jim.thom@telus.net wrote:
You folks that have stepIR 3 el yagis..... I believe you can reverse
the pattern
180 degs.... by turning the DIR into a REF...and vice-versa.
Question is, can you make BOTH parasitic elements into Directors ?
IE: DIR-DE-DIR. On paper, it should become a 2 -element,
bi-directional yagi...with perhaps 4dbd gain in both directions . Does
that concept work ?
I'm assuming equal spaced elements to begin with..and DE mounted to the
mast...above the boom a bit.
Aside from the 180 deg reversal feature, for SOME applications, having
gain in 2 x directions at once can be of benefit.
Ok, here's a dumb question. What if both parasitic els are tuned as
Reflectors ? Does it implode on itself, or is it still bi-diectional
with gain ?
Jim VE7RF
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