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    Easy FM transmitter 0,4 W

    Technical specifications

    Power supply: 12-14 V stab., 100 mA
    RF power: 400 mW
    Impedance: 50-75 ohm
    Frequency range: 87,5-108 MHz
    Modulation: wideband FM

    Schematic diagram

    tx1.gif (5874 bytes)

    Parts list

    Capacitors:
    C1, C2, C12 - 100 pF (ceramic)
    C3, C5 - 0,22 uF (electrolytic)
    C4 - 1,8 nF (plastic)
    C13, C16, C17, C19 - 1 nF (ceramic)
    C8, C9 - 10 pF (ceramic)
    C10 - 47 pF (ceramic)
    C11 - 8,2 pF (ceramic)
    C14 - 60 pF trimmer
    C15 - 35 pF trimmer
    C18, C7 - 100 nF (ceramic)
    C20 - 470 uF (electrolytic, 16 V)

    Coils:
    (All coils are free-standing air-core types, wound of 0,7 mm Cu wire, 6 mm internal diameter.)
    L1 - 4,5 coils
    L2 - 9,5 coils
    L3 - 4,5 coils

    Resistors:
    R1, R2 - 10 k pot.
    R3 - 33 k
    R4, R7, R12 - 10 k
    R5, R11 - 470
    R6 - 27 k
    R8 - 22 k
    R9 - 270
    R10 - 100

    Misc.:
    D1 - BB409 (BB109G, BBY31) varicap
    T1 - BC547C (BC548C, BC547B)
    T2 - BFR91A (BFR96)
    T3 - BFR96

    Antenna
    Power supply
    3,5 mm jack
    CD player, computer
    6 V / 0,1 A bulb

    Assembly and PCB layout

    The PCB is designed for assembling all the parts on the Cu circuit side, without drilling holes.

    tx1dps1.gif (7280 bytes)

    tx1dps2.gif (2133 bytes)

    Tuning

    Connect the 6 V / 0,1 A bulb to the output and use R1 to tune the right frequency. Maybe you might stretch coils of the L1. Then use C14 and C15 to adjust the highest power (the highest light of the bulb). Then you can connect antenna and audio signal. Adjust R2 until the audio sounds as loud as the other stations.

    With good antenna (dipole placed outdoor and high) the transmitter has very good coverage range about 500 meters, the maximal coverage range is up to 4 km.

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