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Date Posted: 07:44:57 02/05/02 Tue
Author: raza30
Subject: Re: AGC sampling added to Rev7t1d2. For Potter and Phil
In reply to: Jain 's message, "Re: AGC sampling added to Rev7t1d2. For Potter and Phil" on 05:06:47 02/05/02 Tue

Jain, can you send me those files please,
i would like to try your AGC hardware solution...

>Right, Tom!
>That was my idea (a hardware solution) that I applied
>last night; I must say that the difference is big,
>between the 47 uF cap solution and this one. The image
>improved obviously, the colours closer to those on
>uscrambled channels (still some work to do around
>this). Actualy, after doing the circuit, after testing
>it, I realized that I could use the lock LED signal to
>delay the start of sampling... too late for me.
>I also have to try some adjustments, the image is
>unstable (horyzontal) on some channels, I suppose the
>levels at 393 have to be checked.
>All the best
>Jain
>
>PS If someone is interested in the hardware solution,
>I'm ready to share it; it involves a MOSFET, a 4093
>and some pasive components.
>
>
>>A simple software solution would be to not apply any
>>AGC voltage until the 3chip is locked. It will sample
>>continuosly until locked and then after lock it can
>>sample and apply voltage at the correct times.

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