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coil uhf 10,7 Mhz

Discussion in 'Electronic Basics' started by Ale, Sep 16, 2005.

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  1. Ale

    Ale Guest

  2. Andrew Holme

    Andrew Holme Guest

    It looks like a Toko 10.7 MHz IF coil with an internal capacitor.
    External capacitor C11 reduces the resonant frequency to 4.5 MHz, the
    TV sound sub-carrier offset. It relies on intermodulation in the
    output stage to cross-modulate this onto the UHF picture carrier. You
    might have difficulty obtaining the Toko coil, but you could easily
    wind your own coil for 4.5 MHz.
     
  3. Ale

    Ale Guest

    "Andrew Holme" <> ha scritto nel messaggio
    .. You
    which color is the nucleus? I have one coil with red nucleus
     
  4. Andrew Holme

    Andrew Holme Guest

    Does it have any numbers on the side? Where did it come from? I'll
    have a look in my Toko catalog when I get home tonight. Does it have
    an integral capacitor? Can you measure the resonant frequency?
     
  5. Ale

    Ale Guest

    No!under, close to the condenser it has one small written, me seems AV1,3
    bought in store

    I'll
    how it is made?sorry!
     
  6. Andrew Holme

    Andrew Holme Guest

    Toko made a lot of different red coils. Some of them were for 10.7 MHz FM
    IF, but not all.
     
  7. Ale

    Ale Guest

    how I would have to make? to buy one orange coil and an other rose and to
    try(?)
     
  8. Andrew Holme

    Andrew Holme Guest

    Which type do you have? See http://www.gekade.com/GKD/TO_TOKO.htm

    Buy a GDO (Grid Dip Oscillator) or an LC-Meter to mesaure the inductance,
    and wind it yourself. You need it to tune 4.5 MHz for the sound
    sub-carrier.
     
  9. At which point, one might as well just grab a 4.5MHz transformer.
    In North America, they were common in tv sets, because that's the
    frequency of the sound IF. I don't know whether they still appear
    nowadays, or if they've been bumped off by 4.5MHz ceramic filters.

    Michael
     
  10. Ale

    Ale Guest

    Excuse me!! I can say to you that he is of 10mm,mi seems 7kn
    Under the coil AVI31.Io is written does not know what wants to say
    I can say to you that he is of 10mm,mi seems 7kn. You can you give a link
    in order to construct the coil to me
    (on the Italian NG, a lot has not helped me)
     
  11. Andrew Holme

    Andrew Holme Guest

    http://www.qsl.net/ct1efl/inductors.htm
     
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