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Date Posted: 23:24:24 02/10/02 Sun
Author: Potter
Subject: Re: AGC S&H Component needs hardware expert's comment
In reply to: Ronald 's message, "Re: AGC S&H Component needs hardware expert's comment" on 22:15:08 02/10/02 Sun

That scope software looks like it needs TV or video capture card (FlyVideo, Haupage etc) and may or may not be what you need.
Maybe your decoder software is displaying more lines than it should at the start of the frame and inverting them as well. I've noticed some channels transmitting pictures with a narrow black band top & bottom of the screen which is not exactly widescreen but perhaps the result of converting from NTSC to PAL (just guessing). A cro should reveal whether these white lines are coming from the decoder or are a part of the picture itself.
Your AGC voltage is definitely stable if it's nailed to the power supply as you described - have you tried a capacitor by itself?.

>My cable system is using PAL-BG suppressed Sync with
>no Invert or color burst. Presently I fix the AGC
>problem with a 5K VR and the center PIN to AGC PIN
>while the other 2pin to +5V and GND.
>
>I am using Canton Rev 3 with Software Rev2.4 on Jen's
>website.
>
>With or without AGC S&H I will get white banding strip
>on the top screen most channel. Tough White Banding
>can be fixed it with a VR, I can see some part of the
>screen have different in brightness and uneveness
>color and brightness. It can be very obvious. So I am
>hope to get a solution to fixed this problem
>
>I am not sure if the operator with come with random
>invert in future but I am interested to know on how to
>get information on the dataline. How to find dataline.
>Wonder if this VBI scope will be helpful.
>http://www.nomadelectronics.com/VidCap/DShow%20Filters/
>VBIScope/vbi_scope.htm

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