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-
- 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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