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MATERIALS
REQUIRED
1 - Radio Shack
mini-box (Part #270-235)
1 - 1/4 watt resistor, 2.2k-2.4k ohm (Part #271-1325)
1 - 75pf-100pf variable capacitor (Very hard to find:
Special order)
2 - F61a chassis-type coaxial connectors (Part #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:
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!!!
Due to different scrambling systems, you might find it
neccesary to change the range and values of the variable
capacitator.
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