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    3 Watt FM Transmitter

     

    This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL can be used on this circuit.

    This is a circuit that I've build a few years ago for a friend, who used it in combination with the BLY88 amplifier to obtain 20 W output power. From the notes that I made at the original schematic, it worked fine with a SWR of 1 : 1.05 (quite normal at my place with my antenna).

    Schematic


     

    This is the schematic of the 3W FM Transmitter

    Parts

    Part
    Total Qty.
    Description
    Substitutions
    R1,R4,R14,R15 4 10K 1/4W Resistor  
    R2,R3 2 22K 1/4W Resistor  
    R5,R13 2 3.9K 1/4W Resistor  
    R6,R11 2 680 Ohm 1/4W Resistor  
    R7 1 150 Ohm 1/4W Resistor  
    R8,R12 2 100 Ohm 1/4W Resistor  
    R9 1 68 Ohm 1/4W Resistor  
    R10 1 6.8K 1/4W Resistor  
    C1 1 4.7pF Ceramic Disc Capacitor  
    C2,C3,C4,C5,C7,C11,C12 7 100nF Ceramic Disc Capacitor  
    C6,C9,C10 3 10nF Ceramic Disc Capacitor  
    C8,C14 2 60pF Trimmer Capacitor  
    C13 1 82pF Ceramic Disc Capacitor  
    C15 1 27pF Ceramic Disc Capacitor  
    C16 1 22pF Ceramic Disc Capacitor  
    C17 1 10uF 25V Electrolytic Capacitor  
    C18 1 33pF Ceramic Disc Capacitor  
    C19 1 18pF Ceramic Disc Capacitor  
    C20 1 12pF Ceramic Disc Capacitor  
    C21,C22,C23,C24 4 40pF Trimmer Capacitor  
    C25 1 5pF Ceramic Disc Capacitor  
    L1 1 5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm  
    L2,L3,L5,L7,L9 5 6-hole Ferroxcube Wide band HF Choke (5 WDG)  
    L4,L6,L8 3 1.5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm  
    L10 1 8 WDG, Dia 5 mm, 1 mm CuAg, Space 1 mm  
    D1 1 BB405 BB102 or equal (most varicaps with C = 2-20 pF [approx.] will do)
    Q1 1 2N3866  
    Q2,Q4 2 2N2219A  
    Q3 1 BF115  
    Q5 1 2N3553  
    U1 1 7810 Regulator  
    MIC 1 Electret Microphone  
    MISC 1 PC Board, Wire For Antenna, Heatsinks  

    Notes

       

    1. Email Rae XL Tkacik with questions, comments, etc.
    2.  

    3. The circuit has been tested on a normal RF-testing breadboard (with one side copper). Make some connections between the two sides. Build the transmitter in a RF-proof casing, use good connectors and cable, make a shielding between the different stages, and be aware of all the other RF rules of building.
    4.  

    5. Q1 and Q5 should be cooled with a heat sink. The case-pin of Q4 should be grounded.
    6.  

    7. C24 is for the frequency adjustment. The other trimmers must be adjusted to maximum output power with minimum SWR and input current.
    8.  

    9. Local laws in some states, provinces or countries may prohibit the operation of this transmitter. Check with the local authorities.

     

     

     

     

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