°°°°°°° Pay TV Decoder Plans
±±±±±±± Compiled by Felipe Almeida
²²²²²²² Copyright 1995 by
Felipe Almeida
*********************************************************
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 necessary to
change the
range and values of the variable capacitator. I’ve also added a
wiring diagram to help you
with designing the circuit.
/// 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
capacitator (Very hard to find)
2 - F16a 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 and.
2. Solder the variable 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 adjustament screw facing
upward.
Note: When it comes time to place coil in box, the coil must be insulated
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.
4. Solder resistor to center of coil and ground
other end of resistor
to chassis box, using solder lug and small screw.
Diagram:
Your circuit and design should look something like this:
—————————————————
! !
! !
! !
! !
!
C !
! ——————— F16a
G O — !
N———-\/\/\/\—- Vc !
D 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 plastic screwdriver (non-metalic), adjust the
variable
capacitor until pictures tunes in. Sit back, relax, and enjoy! Don’t forget
the
popcorn!
Have fun …….
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