[TowerTalk] Yagi gain question

[TexasRF@aol.com]

In a message dated 12/23/2005 9:24:05 A.M. Central Standard Time,  
Gary.Stone at med.va.gov writes:

Hi to  all,



First, I hope you all have a wonderful Holiday and Merry  Christmas.  Thanks
for the help on this reflector this past  year.



I am now trying to sort out in my head a simple way to  get a rough idea
about some gain calculations on a Yagi antenna.  

For example, if a Yagi has a gain of x db or x dbi (whichever) and  is
running a certain power then at what power level would you need with  a
vertical or dipole to roughly equal the Yagi?  Is there a simple way  to get
a ROUGH idea and not a scientific  solution?



Thanks,  Gary,  N5PHT





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Roughly speaking: a 1 dB change happens with a 25.9% power change (ie: 100w  
to 125.9w)and a 3 dB change happens with a two times power change (ie: 100w to 
 200w)
 
If the change is 6 dB then there is two plus two times power (ie: 100w to  
400w).
 
Hope this is what you were looking for.
 
73,
Gerald K5GW