[TowerTalk] H frame for 10 or 15m

[TexasRF at aol.com]

Each yagi design has an optimum stacking distance. There is no universal  
rule for stacking if you want the best performance.
 
Short boom yagis have lower gain and closer stacking distance. Long boom  
yagis have more gain and larger stacking distance.
 
There are a number of computer programs that help in choosing the optimum  
stacking distance and you would do well in acquiring one for your  projects.
 
Stacked too closely, gain is lost. Stacked too wide, gain is not reduced  
but the main lobe is narrowed and large grating lobes appear in the pattern. 
In  addition, you spend extra $$ for stacking frame materials needlessly.
 
73,
Gerald K5GW
 
 
 
 
In a message dated 8/15/2011 2:30:31 P.M. Central Standard Time,  
s-roabr at online.no writes:

Hi

does anyone have ideas sizes for a H frame for 4-5 el yagies  for 10 m and 
15m ?
is it 1/2 wl , 3/4 wl or 1 wl spacing ??

I saw  one from http://www.arraysolutions.com/Users/h2a.jpg Arraysollution 
from  PY5EG


73 LA6FJA Rag

LN5O in  contest


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