[TowerTalk] 2 element yagi formulas

[n4kg@juno.com]

N4KG  responses interspersed below.


On Mon, 30 Aug 1999 zeitler@ibm.net writes:
> 
> Esteemed Reflectees,
> I will be putting up a 2 element vertical yagi for 20 meters soon. 
> Is the  old, long term, ARRL Handbook info of .2 wavelength spacing 
> IDEAL  for a 2  element yagi using a reflector?

	Maximum GAIN for a 2L Reflector Yagi is at 0.15 WL

	Maximum Ground Reflection is with HORIZONTAL
	Polarization.  Why are you thinking of vertical? 

> Also, is it safe to use 468/f for the driven and then add 5% to that 
> for the
> reflector (this is what I have successfully done in the past)?
> I guess kind of a dumb question since I know it works.
> 
	Making the reflector 5% longer is a good rule of thumb.
	Modeling is even better.

> I installed a 2 element vertical yagi five years ago for 17 meters 
> and it
> was an absolute flame thrower. I copied the data from the Handbook 
> and
> figured I would do the same unless those of you who have the latest 
> antenna
> software recommend something that would be even better?
> 
> 73s
> 
> Lane
> ku7i
> 

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