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Date Posted: 05:43:28 06/06/02 Thu
Author: Potter
Subject: Re: El problema de AGC - y audio, ayuda a necesario!
In reply to: Justus 's message, "Another AGC- and audio problem, help needed!" on 07:15:32 06/05/02 Wed

Nuestros amigos suramericanos fijaron un buen sitio con IF información de la viruta una parte posteriora del rato - quizás pueden ayudar aquí.

I think you're better at my language than I would be with yours!
Our South American friends posted a good site with IF chip information a while back - perhaps they can help here.
The audio sub-carrier should be 30-40kHz so Kenny's auto switching design (audeco.zip) should work. Tuning a channel with normal audio will help in finding the sound IF output pin.

>Hello ewerybody!
>
>My video system here in Finland is PAL B/G, with
>Zenith SSAVI, random invert and decoded audio. I build
>canton 3 decoder, with Jens PALcodes. It works almost
>fine, but I have same kind of problem as few days ago
>messagechain by Charly. I think at i need AGC hack, on
>my videos.
>My video is pansonic NV-HD 101EB with Mitsubishi IF
>ship model M52014SP.
>
>Can anyone tell me which pins i should add the AGC
>hack capacitor(s) on it. I think it is pin number 13,
>original capacitor is 3.3uF. I try 47uf an 100uf, but
>nothing happens.
>I can't find data sheet on internet, but i have
>schematic diagram on this video. The schemas includes
>a blockdiagram on schips operating principle. Same
>demodulator pack also founds on Panasonic model
>NV-HD100EB. I think at this model of videos are sold
>world wide different marks at least Grundig and so on.
>I can send schematics anyone who can help me, by
>E-Mail.
>
>I also buid a audio decoder with auto detection, as
>Kenny's design and plan add it on the videos. Does
>anybody knows what is the right place take the audio
>information on the decoder, direct on IF ships
>FM-Detector like pin 17, or on audio?? output pin 16,
>or somewhere else?
>I don't own oscilloscope, so i try to measure carrier
>frequency by Metrix MX54 universal meter. This meter
>includes frequency meter up to 100kHz, but i can't
>measure any reasonable frequencies when the coding is
>active, so i don't know what is the right decoded
>subcarrier frequency.
>
>I'm sorry my bad language.
>
>Please help me.

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