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| Re: Track Detectors (872995) | |||
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Re: Track Detectors |
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Posted by SelkirkTMO on Tue Dec 15 23:01:42 2009, in response to Re: Track Detectors, posted by Jeff H. on Tue Dec 15 22:55:27 2009. One of my favorite chips years ago was the 74LS123 dual monostable multivibrator. Pick off the 31.5 KHz squarewave off the audio IF, condition the signal and use the trailing edge to trigger one of them from a scrambled cable channel. The output was a perfect recreation of the blanking signal that would then be fed into an emitter follower on the RF AGC of the TV set. Unscrambled any pay channel including the ones where they did the gain shift trick. LOVED 74LS. :) |
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