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Build your own pay tv box decoder
Title: Build your own Pay-Tv decoder
Date: 01 Jun 1994
With most of the cable companies scrambling their signals
on most all new and some old channels I thought I'd find
something to make it easier for us to watch those channels.
Due to different scrambling systems, you might find it
neccesary to change the range and values of the variable
capacitor. I have also added a wiring diagram to help you
with designing the circuit. If you have any questions just
leave a message on the board listed at the end of the
article (?).
////*** PAY TV DECODER PLANS ***\\\\
///**** MATERIALS REQUIRED *****\\\
1(one) - Radio Shack mini-box (# 270-235)
1(one) - 1/4 watt resistor, 2.2k - 2.4k ohms (RS # 271-1325)
1(one) - 75pF-100pF variable capacitor (in "ELECTROSONIC" )
(phone # 416-494-1555)
2(two) - F61 a chassis-type coaxial connectors (
12" - No. 12 solid coper 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? inches and form right angle bends on
each end.
2. Solder the variable capacitor to the coil. It doesn't matter
where you solder it, it still does the same job. The best 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-gluing
a piece of rubber to the bottom of the box, and securing the
coil to it.
3. Tap coil at points 2? turns from the ends of coil and solder
to coaxial chassis connectors, bringing tap leads through the
holes in chassis box. Use as little wire as possible.
4. Solder resistor to center of coil and ground other end of
resistor to the chassis box, using solder lug and small screw.
Diagram: Your circuit and design should look something like
this:
--------------------------------
| |
| |
| |
| C |
| -----------F61a
G 2.2k 0 -- |
N------/\/\/--- Vc |
D 1/4w I -- |
| -----------F61a
| L |
| |
| |
| |
--------------------------------
5. Drill a ?" diameter hole 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 the short piece of RG59 coaxial
cable. Set television set to Pay-Channel.
7. Using a plastic screwdriver (NON-METALLIC), adjust the
variable capacitor until picture tunes in.
8. Sit Back, Relax, and Enjoy!!!
Have Fun....
If you have any question or if you get stuck please leave a
message to Mr Lanka.
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