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Date Posted: 16:47:51 02/24/02 Sun
Author: Jain
Subject: Re: Experiments on 3chip
In reply to: Potter 's message, "Re: Experiments on 3chip" on 07:14:06 02/24/02 Sun

Potter, you might be right: from time to time, some scrambled channels might have random burst invert. At this moment I do not have a scope to check that, but, from carefully considering what happens on the screen, I came to that conclusion. At the same time some channels are OK, and others with greenish colour and barelly keeping colour synchronization (sometimes even loosing it). So Canton 5 will be the solution (not with so many amplifiers, just what is needed -- actualy, if you connect 3 chip in FI after the first trap, you need only one amplifier, from the input to the pulse detectors, maybe one on burst path, and the rest.. only emiter followers).
J


Hi Jain
>
>Is the greenish colour on scrambled channels due to
>inverted colour burst, or the decoder expecting an
>inverted burst and 'correcting' it? Incorrectly
>inverted burst gave me a blueish picture on a
>composite monitor. Have you tried changing the
>connection to the burst gate (4066) to the opposite
>polarity from the input buffer.

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