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HELP1_02.TXT
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1997-02-15
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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.