[TowerTalk] Cushcraft 15-4CD Antenna

[n4kg@juno.com]

Optimized for WHAT?  GAIN?  F/B?  F/S?

You can pick up another dB of gain by lengthening the front
director equal to the length of the first director, BUT, you
will need to readjust the Gamma Match.

4L Yagi's are 'weird'.  It is hard to get good F/B without 
funny spacings / tuning.  Gain rises very SLOWLY between
.35 and .65 WL.  Bottom Line: 3L and 5L designs are much
better choices on .35 WL and .75 WL booms respectively.

5L designs can be used on shorter booms, at reduced gain.

de Tom  N4KG

On Fri, 8 Jun 2001 Dennis Egan" <nb1b@mediaone.net> writes:
> Anyone ever optimized one of these?  Any designs one would like to 
> share? Or is the Cushcraft design close enough to optimum?
> 
> For that matter, I can extend the boom a little- say to 24 ft.  
> Anyone done any optimization on one of these on a 24ft boom?
> 
> Thanks in advance.
> 
> Dennis NB1B
> 
> 
> 
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