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Date Posted: 17:46:17 01/25/02 Fri
Author: Potter
Subject: Re: Need expert help please!!!!!
In reply to: gary 's message, "Need expert help please!!!!!" on 19:53:49 01/22/02 Tue

Sounds like it's not locking at all - just feeding the scrambled signal straight through as intended. The big white bar is probably a strong inverted hsync - if it is you should be able to see the colour burst just after it.
Removing the SETMODE routine would prevent locking as this routine counts the number of good/bad consecutive frames and makes the decision to descramble or not. Your problem may be the polarity of the edges your code looks for to find specific events EG if the VBI is inverted the LOCKON routine needs to look for a mirror image of events (PED instead of NED & vice versa). A close examination with a cro should reveal what you require.

>
>Hi expert programming guy! Has you know, i'm in
>Canada, Montreal. The only way i got the
>PIC16F84A-20/p Locking on scramble channel with the
>3Chip Board was by removing SETMODE section in Rev1tb
>file. The only problem, it dosen't synchronise the
>horizontal and vertical good. Everytime you change
>channel, the big white bar in the vertical is never at
>the same place in the screen, and horizontal is a bit
>wavy on top. The burst is not very nice too. Any
>suggestion?
>Thanks

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