[amsat-bb] Homebrew Polarity Switch

[David Wing]

I’m looking into making a polarity switch for a ¼ wave offset crossed yagi
and am reviewing the write-up in the ARRL Satellite Handbook and the ARRL
Antenna Book (pretty much identical articles).  The diagram calls for a “1/4
wave 36 ohm transformer” as a part of the circuitry.  I’m having some
trouble finding anything like this online.  Is this a readily available
item?  Is it something I should plan on scratch building?  There is a
picture in the Antenna Handbook and the antenna includes this item and it
appears to be a manufactured part.

 

If anyone can point me in the right direction to find this item I would
appreciate it.  Additionally, if it is something that I could fabricate and
there is good info available online, please forward any appropriate links to
me.

 

Thanks,

David

K6CDW