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Re: Power divider for X-yagis



Hi Joop!

Take a look at drawing, described in: 
http://www.vhfdx.ru/content/view/180/40/
The article is in Russian, but described in it power divider is designed 
with square pipe with all dimensions.
The divider could be build for 433MHz and 1296MHz also, there are mentioned 
corrections in mm for different band versions.
If something is difficult to understand, let me know, I'll try to translate 
some points in English. Or just use the free translation web tool: 
http://www.online-translator.com/text.asp?lang=en

73! Oleg LY3UE



----- Original Message ----- 
From: "Joop & Tineke Verdoes" <joop.verdoes@nameplanet.com>
To: <amsat-bb@amsat.org>
Sent: Friday, May 26, 2006 11:51 AM
Subject: [amsat-bb] Power divider for X-yagis


> Hello to you all.
>
> When buidling a phasing harness for (switchable) circularly polarised
> crossed-Yagis one needs a device to split the line from the TRX to the
> two legs of the yagi.
> In the ARRL antenna handbook (and others) I see quart lambda 36 ohm
> transformers in the figures.
> In my current state of confusion I have the following questions.
>
> 1- this 36 ohm transformer is apparently a square pipe with a round rod
> to which three N sockets connect. Where do I find "the right" formula
> for calculating the characteristic impendance for square pipe with a
> round rod in it. I coulnd't find it in any of the ARRL or RSGB books I
> have. (but I might have gone blind for just this :-)) On the net I found
> different formulas.
----
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