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Old February 12th 07, 02:00 PM posted to rec.radio.amateur.antenna
Wes Wes is offline
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First recorded activity by RadioBanter: Nov 2006
Posts: 28
Default Yagi antenna design question

On Feb 10, 7:27 pm, "Yuri Blanarovich" wrote:

My previous ISP sold me off to a new one. SInce that time I've had no
end of email problems and in addition the new guys don't provide
newsgroups, so I've been reduced to using Google Groups. Yuch.

I spent too much time composing a response to Yuri's last post and
then did not see it appear after posting. I will not waste further
time, but in a nutshell I offered another case using the self-
reactance of the DE as part of the matching network.

In this example, to avoid any "loss due to loading" resulting from
shortening the DE, I *lengthen* the DE to obtain an inductive
reactance for the series arm of an L-network and then use a shunt
capacitor for the second matching element.

The model is he

http://www.k6mhe.com/n7ws/N7WS_Yagi_Lengthened.EZ

Run the analysis, and add a shunt 195 pF and see what you get.

Regards,

Wes N7WS

 
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