[TowerTalk] modeling insulated DE using YO

[TexasRF at aol.com]

Pete, please keep in mind that the hairpin will add some inductance across  
the feed point. This means the d.e. length will need to be slightly reduced  
compared to a tee match arrangement.
 
This has nothing to do with your original question which hopefully others  
will answer.
 
73,
Gerald K5GW
 
In a message dated 2/18/2007 2:29:05 P.M. Central Standard Time,  
n4kw at infionline.net writes:

I have  been attempting to model an insulated driven element (DE) for a 5el 
Yagi  using YO, and not sure if I am using the correct procedure.  The YO  
manual does not address an insulated driven element.  I am converting  from a 
"T" Match to a Hairpin Match and thus the insulated DE.  I am  getting 
conflicting results for the shorting arm distance which leads me  to 
wondering if there is a problem with my procedure or the  software.

After developing the taper schedule for the antenna elements,  in the DE line 
I place a 0 (zero) in the column under the correction  factor used for the 
mounting plate that is used for the remaining  elements.
The DE line now looks like this
1.9000            1.2500          1.0000       0.7500 
0.500
87.945      0.0     30.000       57.000         57.000  
60.600

I used a zero as the mounting plate is not taken into  account since the DE 
is insulated from the boom.

Is this the  correct method to use when modeling an insulated DE.

73 Pete  N4KW


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