[amsat-bb] Re: Cheap yagi info

[Yoshihiro Imaishi <imaishi@xxxxxxxxxxxx>]

Hello This is Yoshi.

At 2001/06/29 01:05:50 Claudio Martins wrote:
>   I would like to take one of these simple designs and make a switchable 
> sense circular polarization yagi array, using the same boom for the two 
> yagis. Did anyone try this with these cheap designs? Can the matching scheme 
> used mess with circular polarization operation?

  I did. My 435MHz 11-ele RHCP YAGI is as below;

Photo:
http://plaza16.mbn.or.jp/~palau/images/s-11elex01.jpg

Feeding Point:
http://plaza16.mbn.or.jp/~palau/images/s-11elex02.jpg

Element location:

   (Element set A)                                               180cm
             |  |  |   |    |    |     |     |     |     |     | Woodstick
             |  A  |   |    |    |     |     |     |     |     | /
  [#######]=====@====@===============================================
   Ext.Pipe       |  B  |   |    |    |     |     |     |     |     |
                  |  |  |   |    |    |     |     |     |     |     |
   (Element set B)
             :    :
             <----> 1/4-ramda (170mm) deff. for CP phasing.

Splitter design.

        (1) 134mm        (2) 134mm
  A<----------------*----------------->B
                    |
                    |(3)
                    +--> RIG

  (1)=(2)= 1/4-ramda of 3C-FVR TV coax cable (75ohm).
  (3)    = 50ohm coax line (8D-FB 20m)

  My antenna is fixed on RHCP only. I used this for AO-40 U-uplink
during its X-pond test operation at last May.


Yoshihiro Imaishi JF6BCC/KH2GR
GL:PM53JV, ex KC6IY(T88IY),V63BP
mailto:jf6bcc@jarl.com
<http://plaza16.mbn.or.jp/~palau/index-hame.html>
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