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2N4427 1Waat FM Verici

Konusu 'Fm Verici Devreleri' forumundadır ve uydudoktoru tarafından 29 Kasım 2010 başlatılmıştır.

  1. uydudoktoru
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    uydudoktoru Aktif Üye Yönetici Yönetici

    Katılım:
    13 Haziran 2009
    Mesajlar:
    2.142
    Ödül Puanları:
    38
    885_ostr5.jpg

    885_ostr6.jpg

    Values for the 1W FM transmitter:
    =================================


    L1 L2 L3 L4 L5 L6
    Diameter: 8mm 8mm 5mm 5mm 5mm 5mm
    Turns: 4 2 1/2 4 1/2 4 1/2 4 1/2 4 1/2
    (3 1/2 + 1)
    L1 and L2 are winded on the some form with adjustable core.
    All coils are made of 0,5mm^2 Cu.
    DR: 0.5mm^2 Cu through 5x10mm HF choke
    L3 works at the double frequency of L1.


    Values for the 25W FM amplifier:
    ================================


    L7 L8 L9 L10 L11
    Diameter: 10mm 8mm 7mm 8mm 8mm
    Length: 5mm 10mm 10mm 10mm 10mm
    Turns: 2 4 2 4 3


    All coils are made of 1.5mm^2 Cu.
    DR: 0.5mm^2 Cu through 5x10mm HF choke
    Instead of BLY89A you may use 2N6082, which can take more SWR.


    25W FM transmitter
    ==================
    Use a two layer board, and connect the two sides by drilling holes and
    soldering a copper wire in it. This is marked as doughnuts.
    The transmitter is built as two separate units, in two shielded boxes. All
    capacitors should be ceramic. Both power transistors needs good cooling.
    A heat conducting paste should be used, and a cooling rib should be placed
    on the outside of the box.Short about how it works
    The oscillator (BFY90) is oscillating on half the frequency. Frequency
    doubling takes palace in the following stage, where the 2.nd overharmonic
    is amplified. Since all stages is working in class C, you don't have to use
    a switch to turn of the amplifier. When the 1W transmitter part is turned
    off, the 25W amplifier also shuts off, as no base current is given.Trimming
    For this you need a SWR meter, and a 50 Ohm dummy load. Make the 1W unit
    work first. When you know this unit is adjusted properly, you can connect
    the amplifier and start trimming it. The trimming part can be a bit tricky,
    since all variable capacitors have to be correct set. Start from the left
    and work yourself against the output, and repeat this procedure severaltimes.
     

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