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Date Posted: 22:21:12 01/14/03 Tue
Author: Phil Q.
Subject: Re: Question For Phil.Q
In reply to: hardwork 's message, "Question For Phil.Q" on 17:33:39 01/14/03 Tue

Hi HW,

What system are you on; ie, who makes the set top box? What does it look like on the scope? Can you see the horizontal sync pulses at all, are they split and/or pushed up into the video? If you can see the sync pulse edges then you should be able to lock to them. That reminds me though... the edge detectors seriously needed to be tweaked in the 4.2. Let me pull up the schematic.... change R3 and R6 to 3.3K and you should see a big improvement. A more conservative change would be changing them to 2.2K but it wasn't quite enough to make mine truly reliable, 3.3K made it work great as I recall.

The 200kHz sounds like the old sync in the audio subcarrier system.

Good luck... I'm going to bed!

- Phil


>Hi Phil, maybe you can help. We have NTSC system over
>here and no code lock over here, well almost. I found
>out the on every scramble channel only, there is a
>200khz cycle running in the background, is there
>anyway to lock on this? Our 3chip Board here use a
>pic16c54 wich works fine but I dont have the code for
>it. It only activate on scramble channel, if I use any
>of your code here, it activate on regular channel and
>almost lock on the scramble channel.
>
>Any help would be appreciated.
>
>Thanks
>
>
>
>
>
>>I almost getting to lock, very close, will let you
>>know.
>>
>>>>I've seen one version of 3 chip decoder working in a
>>>>VCR.
>>>>I can not get the code beacause he's write protect.
>>>>There's anybody had already that code for PIC16C54.
>>>
>>>If you find something good about Videotron cable
>>>system e-mail me please. I am looking for a code for
>>>that pic IC. Thx

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Replies:

  • Re: Question For Phil.Q -- Phil Q., 22:23:59 01/14/03 Tue
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