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Date Posted: 19:40:27 01/21/03 Tue
Author: Pokey
Subject: New ideas & intermittent audio
In reply to: Potter 's message, "Re: Rogers (Toronto) setup" on 04:17:46 01/21/03 Tue

>That sounds fairly close - the pulses should be about
>1-2uS wide depending on the size of the edge it's
>responding to. The first hurdle is to return from the
>lockline routine close enough to being in sync so that
>lock will be achieved in about 4 frames otherwise the
>code jumps back to the lockline routine to try again.
>You really need a good cro to see what's going on IE
>that the code is looking for edges of the correct
>polarity etc
>

Is this circuit/code sensitive with respect to the oscillator? I thought that I might put in another variable cap along with a fixed cap all in series. This way I might get to fine tune the oscillator with smaller increments.

Also, I've read that some people have added 75ohm pull down resistors at the in/outputs. Does the Canton3 need this? Or does the circuit already have an Rin and Rout of 75ohms?

Lastly, my vcr outputs a blue screen on weak channels. I've turned this off and it works great. I get a continuous picture but I've noticed that the audio cuts in and out. I don't see an option in the menu (similar to the blue screen) to change this. Anyone know if this is a vcr thing or the way the signal is scrambled? I wonder if I'm using the wrong code (rev7t1a).

Pokey

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