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Conference 7.286::atarist

Title:Atari ST, TT, & Falcon
Notice:Please read note 1.0 and its replies before posting!
Moderator:FUNYET::ANDERSON
Created:Mon Apr 04 1988
Last Modified:Tue May 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1433
Total number of notes:10312

235.0. "Ferguson MC01 TV monitor" by MINDER::GILBERT (North UK Region Appl'n Centre @MCO) Mon Sep 19 1988 11:09

    I am using a Ferguson MC01 TV/monitor with my 520STFM. I made a
    signal cable up myself to use the RGB signals. After putting 1K
    ohm resistors in series with each of the R, G, and B wires to stop
    the 'white-out' effect, the results are very good - better than yer
    average Amstrad 1512 (admittedly not difficult to beat).
        
    Fine. Except...
    
    There's a buzz on the sound. Not very loud, but just enough to be
    unacceptable. It REDUCES in volume if you INCREASE the volume of
    the MC01!
       
    The cable is a 6-core screened, with the ground pin of both the
    ST(pin 13) and MC01(pin 1) plugs connected to the screen.
    
    Any ideas, please?
T.RTitleUserPersonal
Name		DateLines
235.1Video on Sound ???SEDOAS::WATTIt's Life Jim but not as we know itMon Sep 19 1988 12:026
    
    Run a separate wire from the sound output to the input and see if
    you still get it. I made my own cable as well but it has seperate
    shielding for the video wires and the sound.
    
    Regards Peter.
235.2Screened, but still buzzingMINDER::GILBERTNorth UK Region Appl'n Centre @MCOWed Sep 21 1988 04:2113
Hi Peter,
    I was afraid that would be the next thing to try, I just couldn't
    face unpicking the connections to those *?�$!"% DIN plugs again.
    
    Anyway, I had a go last night. Result, no (or if at all very little)
    change.
    
    That seems to point to video interference either coming from the
    ST or being induced within the internals of the MC01. No one else
    seems to have complained about the ST with other monitors, so the
    MC01 it is - tonight!

    Regards, Brian
235.3SEDOAS::WATTIt's Life Jim but not as we know itWed Sep 21 1988 06:567
    
    Does the sound change with differant pictures on the screen ? If
    it does then it is Video on sound, other than that it could be produced
    in the monitor itself or even by the Atari. I use the same monitor
    and don't have any problems.
    
    Peter
235.4Still investigating...MINDER::GILBERTNorth UK Region Appl'n Centre @MCOWed Sep 21 1988 13:0012
    Don't recall any change with picture content, but I do know that there is
    also a buzz when I connect my Acorn Beeb.
        
    Another factor which leads me to suspect the MC01 internal wiring.
    
    Seems OK when using RF (aerial) input, - except the picture quality
    of course.
    
    The hunt continues...
    
    
   Brian