[IRCA] Tips for Winding the E100 Slider Coil

[D1028Gary@xxxxxxx]

Hello Guys,
 
     As most of you are aware, a new type of AM  loopstick was developed this 
summer for use in the E100 Ultralight and  other single-coil designs, in 
which the loopstick coil is shifted by the DXer to  peak each incoming signal on 
its own frequency. This simple innovation  makes a huge difference in the 
sensitivity of the radio on all AM  frequencies, making it competitive or superior 
to all of the most popular  portables in AM-DXing history.
 
     For those DXers wishing to construct a Slider  loopstick for their E100 
or other portables, one of the challenges is winding a  coil of 40/44 Litz 
wire that will slide easily on a type 61 Amidon 7.5" ferrite  bar, but not "too 
easily."  The early designers of Slider loopsticks  (John Bryant and I) faced 
this problem, and we both developed our own  solutions.
 
     Although John certainly has his own  procedure, my own trick is to wind 
the coils on a form of waterproof tape,  wrapped tightly around the most 
slippery half-inch diameter material I  could find:  the long, half-inch shank of a 
router bit.  In order to  ensure that the coil will be very slightly larger 
than .5" in  diameter, I place a 3" long, 1/16" wide strip of a cut up credit 
card lengthwise  on the router bit shank, before winding the coil.  This strip 
of the credit  card is pulled out after winding the coil, to ensure that the 
coil will easily  slide off the router bit shank.  If all goes well, the coil 
will slide  easily, but not too easily, on the half-inch diameter Amidon 
ferrite bar.
 
     Should the coil slide too easily, it is a simple  matter to cut thin 
strips of the waterproof tape and place them lengthwise  inside the coil 
(adhesive side out), until the coil "drag" is ideal.  The  Type 61 Amidon ferrite bars 
also have slight ridges lengthwise from end to end,  which allows the DXer to 
rotate the coil slightly to find the ideal  "drag" position (as long as the 
pre-wound coil is approximately correct in  inner diameter).  Good luck!
 
     73,  Gary DeBock 
 
 
  
 
 
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