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Date Posted: 22:42:29 02/11/02 Mon
Author: Potter
Subject: Re: Potter: Hardware AGC rectification
In reply to: Ronald 's message, "Re: Potter: Hardware AGC rectification" on 22:10:31 02/11/02 Mon

A good look with a cro would reveal more - I'd be looking at the size of the sync pulses in relation to the rest of the signal and trying the 'brightness' adjustment which affects this relationship. I get the the best result just before it becomes unstable and I'm working with a weakish signal due to trees in the signal path.
I've got a working 50Mhz unit but I don't think the improvement over 20MHz is exactly worth the extra trouble in setting it up plus at my place I need to submit an application in advance to take the 'service' out for research & development now.
>
>Hi Potter,
>By measuring with a MultiTester, it is about 1.2V. I
>measured the value of the VR is about 268Ohm to ground
>in series to with 100uf capacitor from AGC PIN. I can
>get best picture quality with 100uf alone but the
>whole screen will flash or flicker. So I have to
>adjust the VR just before it flashes or flicker. Do
>you what is my problem?
>
>By the way I just got my SX18/AC chips and 50mhz
>resonator. Wonder if I can find SX 50Mhz PAL Turbo
>code for Canton Rev3 PAL? Or If you can modify your
>source code in Sakman to do Canton Rev 3.

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