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From: tfykh@fy.chalmers.se (Kenneth Holmlund)
Newsgroups: sci.electronics
Subject: TV scrambler - Help!
Message-ID: <1991Apr16.141319.14425@fy.chalmers.se>
Date: 16 Apr 91 14:13:19 GMT
Sender: usenet@fy.chalmers.se
Organization: Chalmers Univ. of Technology, G|teborg, Sweden
Lines: 22

Hi,
I have a cable net in my house but several channels are scrambled.
Last week, I bought a kit that should take care of this problem (yes, I
know it's illegal). However, the circuit does not work properly. 
It is very diffucult to adjust it for a stable picture.
I do not exactly know how the circuit works, but it seems to trig from
a signal in my TV-apparatus (a coil is put on top of the apparatus).
The main component in the circuit is a Toshiba 4093 (NAND Schmitt-Trigger).

Could somebody explain to me how the (de)scrambling works and how I can improve
the circuit. If this information is not enough I could post the logical scheme.

Do you know about any articles in magazines such as Radio Electronic that deals
with (de)scrambling signals?

Thanx in advance,

        Kenneth Holmlund 
       (tfykh@fy.chalmers.se)

Ps If this subject is old and boring to other readers, please email the
   response to me personally.