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- Producing your own Decrypt Viewing Card Mk1.02
- ----------------------------------------------
-
- Unless otherwise stated all files mentioned in this document can be
- downloaded from http://www.arnold1.demon.co.uk/sat/
-
- 0) Basic information
- This card is a "season type" interface to connect your PC to your
- satellite decoder. Using programs like Decrypt you will be able to view
- a number of encoded transmissions in Videocrypt and D2MAC.
-
- This card differs from the previous Mk1 card in that the card can be cut
- into two pieces. The first piece contains the interface circuitry while
- the second piece is inserted into the decoder. The two parts are connected
- using a short length of four way cable.
-
- 1) Making the Printed Circuit Board.
-
- If you have access to a HP laserprinter:-
-
- Download the file DVC1_02P.ZIP.
- ( I hope to include some other common printers later. )
- Unpacking this you will find a file named HP_102.prn.
- If you are working under Windows 3.x or Windows95 you now need to open
- a dos window.
- Goto the directory containing HP_102 and enter the following command:
- "copy /b hp_102.prn lpt1" and press enter.
- You may change lpt1 to suit whichever port your printer is connected to.
-
- If you prefer to use Windows for the above you need to use a program which
- will allow you to copy a file directly to the printer port. If you do not
- have a program to do this please load prfile10.zip and follow the
- instructions contained within.
-
-
- If you do not have access to a HP laserprinter:-
-
- Download the file DVC1_02A.ZIP. This contains the original drawings.
- These are larger than required and will have to be scaled down.
- A quality graphics program will do the job.
- The width should be 54.0 mm and the full length 120mm. Both dimensions are
- measured between the corner marks.
- There are a few good programs which may be used to do the rescaling.
- Try one of the following :-
- Lotus Freelance, a trial version of which should be available from
- http://components.lotus.com/26f2.html.
- Paint Shop Pro, a trial version should be available from
- http://www.jasc.com.
- Microsoft Image Composer, a trial version should be available from
- http://www.microsoft.com/msdownload/micsetup.htm.
- Load the image into one of the above packages and print it out.
-
- You should now have, on paper, a copy of the printed circuit board layout.
-
- Check the printout is correct by measuring the width and length.
- The mirrored Card layout should be 54mm x 120mm. The width is very
- important but the length can be allowed to vary by +/- 1mm.
-
- A 600 dpi laserprinter is reccommended for the printout to be in
- good quality.
-
- If the test printout is correct you can now print the file again onto
- plastic foil or film (overhead projection film).
-
- The contact area at the front of the card is designed to avoid problems with
- short circuiting signals and power supplies. However, this is achieved using
- thin tracks, so as to avoid problems when making the pcb inspect this area
- of the foil very carefully. You may need to redraw some of the lines using
- a fine dark black ink pen.
-
- You will need a piece of 0.8 mm thick photo printed circuit board.
- This can be a little difficult to find but should be available from
- the better hobby electronic stores.
-
- Describing the etching process is beyond the scope of this document.
- If you know how, there is no need, and if you don't, then get somebody
- to do it for you.
- Simple etching kits can be bought from the better hobby electronic stores.
- Be careful and remember that the chemicals used can be dangerous.
-
-
-
- After the board is etched drill the holes for the components.
- Drill a little hole in the tiny squares as well, these are the
- holes for fastening the cable from the PC.
-
- If you intend building the card in two parts you will need to drill additional
- holes to fix the interconnecting cable and to allow the part containing the
- circuitry to be mounted in a box/inside the decoder etc.
-
- Cut the edges cleanly and accurately and sand them a little, always
- remember the final width of 54.0 mm (this is extremely important).
- If the board is to be left in one piece the length should be 114.5mm.
- If the board is to be cut into two the length should be 120mm, the extra
- length is required to provide mounting holes. In this case the board should
- be cut along indicated lines. Ensure that the four tracks which go to the
- very edge of the board do not short due to stray bits of copper.
-
- We recommend that you coat the contact pads at the front of the card with a
- thin layer of solder, this will improve future reliability of the interface.
-
- Your circuit board is now ready to have the components fitted.
-
-
- 2) Component list.
-
- ---------------------------------------------------------------------
- The RS-stock numbers are given as a reference.
- You may find cheaper prices elsewhere.
-
- 1 **IC SN7407N RS: 306-336
- 1 **IC MAX232CPE RS: 655-290
- 1 14 Way IC Socket RS: 447-314
- 1 16 Way IC Socket RS: 447-320
- 5 Capacitors 0,1 uF RS: 116-953
- * x m. Cable 4 conductors RS: 362-651
- *1 9 Way Com connector RS: 472-843
- *1 9 Way Hood RS: 484-789
- *1 25 Way Com connector RS: 470-904
- *1 25 Way Hood RS: 484-802
-
- * To fit your PC's Com port.
- ** Data sheets are available for these devices on my homepage.
- ---------------------------------------------------------------------
- Option: Overcurrent protection.
-
- 1 Zener diode 5.6 Vz RS: 283-665
- 1 Resistor 2.2 kOhm RS: 149-739
- ---------------------------------------------------------------------
- Option: Leds for VCC and DATA .
-
- 2 Leds with integrated resistor, choose colour to fit your decoder.
- Green RS: 197-104
- Red RS: 197-097
- Yellow RS: 197-110
- ---------------------------------------------------------------------
-
- Solder the components to the circuit board leaving the IC's until last.
- Take care to mount the capacitors with the correct polarity.
- You will find a '+' on the circuit board to guide you.
-
- If you choose to fit the optional zener diode, the cathode (marked by a
- ring at one end) should be against the 2.2kOhm resistor.
-
- If you choose to mount the optional leds you will find a mark on them,
- this pin is the cathode and should be placed in the hole connected
- to ground for the V diode, and the feed from the SN7407N for the D diode.
- I recommend you mount these diodes pointing upwards, or they will be most
- iritating in a dark room.
-
-
- If the board has been cut into two parts you should connect the two halves
- using a short length of 4way cable. This may be fastened to the board in
- the same was as the main pc cable as described below.
-
- Solder the cable conductors to the circuit board
- Colour A to GND
- Colour B to RXD
- Colour C to DCD
- Colour D to TXD
- Fasten the cable to the printboard with 3 thin metal threads which
- you twist and glue on the backside.
-
-
- Connecting the cable to the Com connector
-
- ---------------------------------------------------------------------
- 9 way version
- Solder the conductors to the backside of the socket.
- Colour A to Pin no 5
- Colour B to Pin no 2
- Colour C to Pin no 1
- Colour D to Pin no 3
-
- Link pins 4-6-8 together and mount the hood.
- ---------------------------------------------------------------------
- 25 way version
- Solder the conductors to the backside of the socket.
- Colour A to Pin no 7
- Colour B to Pin no 3
- Colour C to Pin no 8
- Colour D to Pin no 2
-
- Link pins 5-6-20 together and mount the hood.
- ---------------------------------------------------------------------
-
- Mounting the two IC's.
- Ground yourself to get rid of any static electricity.
-
- Carefully place each IC into the correct socket ensuring that pin 1
- is in the correct place.
- You will find a '1' on the circuit board to guide you.
-
- And now your Decrypt card is ready for use.
- Congratulations !
-
- PLEASE NOTE:
- IF you alter the drawings in any way, they will no longer be the
- drawings to the DECRYPT VIEWING CARD. For that reason I ask
- that you delete all non electronic information from the card layout!
-
- IMPORTANT NOTICE
- ----------------
- The Decrypt Viewing Card contains several small parts which are easily
- broken off, these could be harmful to children. For this reason we ask
- that you keep this card away from children.
-
- Also, be careful when handling your DVC close to the TV set. Apart from the
- damage that can occur to DVC due to static from the TV screen you may also
- receive a nasty shock.
-
- FEBRUARY 1997
- JOOS DESIGN and PAUL ARNOLD
-
-
- If you are not in a position to build the card yourself you can send
- an email to:
- jarols@online.no
- and ask for the price of a Complete Card.
- This will be a handbuilt card after a prepaid order only.
-
- This card must only be used to watch TV-channels for which you have a
- legal subscription. It may also be used in some countries to view
- channels which cannot be subscribed to (eg Filmnet in the UK).
- Watching encoded TV-channels you have not paid for is illegal in most countries.
- Good luck with your hobby.
-