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Dubbing NTSC to PAL

Discussion in 'Televisions' started by adrianmorris, Jan 15, 2003.

  1. adrianmorris

    adrianmorris
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    Hi,

    I have an NTSC format VHS tape that I want to dub to VHS.

    I have an Aiwa 5900 with NTSC playback that provides a good signal to a 7 yr old TV, which I had assumed was in PAL format.

    I am connecting the Aiwa 5900 to an older (non NTSC playback)Aiwa 3500 in order to try to dub the tape.

    Whichever way I connect the 5900 to the 3500 (SCART to SCART, aerial cable or SCART to video/audio), the Aiwa 3500 sees a garbled picture which has 3 images on the screen at once, at top , middle and bottom of the screen.

    I am new to all of this. Please could somebody give me some advice or tell me where I am going wrong.

    Thanks,
    Adrian Morris
     
  2. LV426

    LV426
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    You can't do what you are trying to do with the equipment you have.

    There are three important things that 'describe' a TV signal:

    1) Number of lines. NTSC=525; PAL=625.
    2) Refresh rate (field frequency). NTSC=60hz; PAL=50hz.
    3) Colour carrier. NTSC=NTSC; PAL=PAL.

    Your playback VCR exploits the ability of most PAL-only TVs to be able to understand the first two attributes of an NTSC signal - 525 lines, 60hz. However PAL-only TVs can't cope with the NTSC colour carrier. They need PAL. So your VCR outputs a hybrid signal which is 525 lines, 60hz, PAL colour. The TV copes with this.

    HOWEVER

    your recording VCR can only cope with true PAL - 625 lines, 50hz, PAL. The disturbance you are seeing is because it can't cope at all with 525 lines and/or 60hz.

    To do what you want, you will need a full standards converter (or a VCR with one on board). There are rare and expensive. (Standards converter, from about GBP300 upwards; VCR about GBP500 upwards).

    Otherwise, some of the HC mags carry adverts for firms that will do this for you (provided the material isn't copyrighted).
     
  3. adrianmorris

    adrianmorris
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    Nigel,

    Thanks for your full and comprehensive reply.

    I now understand why it doesn't work.

    Adrian.
     

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