Homebrew PCBs

There is nothing magic about this circuit!  It is a duplicate of the one 
in *_QST_*, December, 1969 pg. 11, or the 1970 *_Radio Amateur's 
Handbook_*, pp. 557-558 - which also gives the calibration procedure.  
I've built several of these over the years - used just any ferrite 
toroid core available that would pass the co-ax through the center - 
you're going to have to calibrate it anyway.  Any trimmer cap will work 
- ceramic, mica or air dielectric - just keep it small and use the 
shortest possible leads.  Diodes? 1N34 from Radio Shack will work - in 
fact they're called for in the reference articles.  If you can't find 
the feedthru caps, pass a wire through a hole in the shielding, and 
bypass on the side away from the RF section.  The only reason to 
slavishly follow the pictures is if you are doing a restoration for 
complete authenticity.  Put the works inside a box that resembles the 
original, and who (besides yourself) will know the difference?

The magazine or  book should be available from larger libraries - maybe 
on eBay - or from members of your local radio club.  If you are 
desperate, contact me off-list  and I'll e-mail you the two pages.

Norm
W6NIM


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