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Showing posts from March 27, 2011

MARKS BITX VERSION 3 WITH NPO VFO

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Our friend Mark MC Nabb   KF7NCF, has developed a VFO coil that uses NPO tuning. Mark has build his Bitx version 3 using the NPO COIL .
The details for making a case and NPO as per Marks calculations is given here:
vThe main thingneeded will be the aluminum box.  Can you obtain square aluminum
tubing?  I used 1-3/4" square with 1/8" walls but I think we could go
up to 2 or 2-1/2"  without taking up too much space.  
vThe coil form can be just some plastic tube I had laying around.  It could also just be
a paper wrapped in a circle and then coated with varnish, lacquer, orshellac.
v The shaft could be any 1/4" plastic rod.  The carrier and
carrier locator strips will just be 1/4" or so plastic sheet.  All
assembly (mounting strips, the ferrite bead, etc) will be done with
hot melt glue.
vWe thank Mark for making this design and we may come up with a small kit that may fit
Inside the Bitx Case.

PICTURES OF MARKS BITX WITH NPO VFO