With most of the cable companies


scrambling their signals on most all


new and some old channels I thought I'd


update and revise my first version


(1.0) of Pay Tv Decoder Plans.


  Due to different scrambling systems,


you might find it neccesary to change


the range and values of the variable


capacitator.  I've also added a


wiring diagram to help you with design-


ing the circut.  If you have any


questions just leave a message on the


board listed at the end of the article.





                       (Tom) Hackerman








     ///PAY TV DECODER PLANS///


             Version 2.0








      ///MATERIALS REQUIRED:///






1   - Radio Shack mini-box ( #270-235)


1   - 1/4 watt resistor, 2.2k-2.4k ohm


      (RS #271-1325)


1   - 75pf-100pf variable capacitor


      (Very hard to find)


2   - F61a chassis-type coaxial


      connectors (RS #278-212)


12" - No. 12 solid copper wire


12" - RG59 coaxial cable








          ///INSTRUCTIONS///





1.  Bare a length of No. 12 gauge solid


copper wire and twist around a 3/8"


nail or rod to form a coil of 9 turns.


Elongate coil to a length of 1 1/2"


inches and form right angle bends on


each end.





2.  Solder the varible capacitor to


the coil. It doesn't matter where you


solder it, it still does the same job.


The best place for it is in the center


with the adjustment screw facing upward





Note: When it comes time to place coil


in box, the coil must be insulated from


grounding.  This can be done by crazy-


glueing a piece of rubber to the bottom


of the box, and securing the coil to it.





3.  Tap coil at points 2 1/2 turns from


ends of coil and solder to coaxial


chassis connectors, bringing tap leads


through holes in chassis box.  Use as


little wire as possible.





4.  Solder resistor to center of coil


and ground other end of resistor to


chassis box, using solder lug and small


screw.





Diagram: Your circut and design should


look something like this:





    ----------------------------


    !                          !


    !                          !


    !            C             !


    !             -----------F16a


    G    2.2k    O --          !


    N----\/\/\---    Vc        !


    D    1/4w    I --          !


    !             -----------F16a


    !            L             !


    !                          !


    !                          !


    ----------------------------





5.  Drill a 1/2" diameter hold in mini-


box cover to permit adjustment of the


variable capacitor from the outside.


Inspect the device for defects in


workmanship and place cover on mini-


box.  Tighten securely.





6.  Place device in line with existing


cable on either side of the coverter


box and connect to television set with


the short piece of RG59 coaxial cable.


Set television set to HBO channel.





7.  Using a plastic screwdriver (non-


metallic), adjust the varible capacitor


until picture tunes in.  Sit back,


relax, and enjoy!!!








Have fun...





       (Tom) Hackerman





       O S U N Y  B B S


       (914) 725 - 4060


        _  _


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