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    Portable FM transmitter 1 W

    Introduction

    This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the parts are placed on one circuit board. The RF power is switchable between 1 W (HI) and 0,2 W (LO).

    tx3.jpg (87806 bytes)

    Technical specifications

    Supply voltage: 12 V from accumulator or regulated power supply
    Supply current (HI/LO): 270/170 mA
    RF power HI: 1 W
    RF power LO: 0,2 W
    Impedance: 50-75 ohm
    Frequency range: 87,5-108 MHz
    Modulation type: wide-band FM
    Modulation inputs: line, mic, RDS/MPX
    PCB dimensions: 11,3 x 8,8 cm

    Schematics:

    The schematic diagram is divided into three parts: RF part (numbered from 1), PLL (numbered from 30) and audio part (numbered from 50).

    RF part
    PLL
    Audio part

    Complete parts list

    Printed circuit board

    Tuning

    Connect a 6 V / 0,1 A bulb to the output and set the right frequency on PLL. Set the RF power to HI. Now turn on the transmitter. You should tune it on a receiver. Maybe you might stretch coils of the L1. Fix the L1 in position when the tuning voltage (on Q3) is in range 4-9 V. Then use C15, C16 and C17 to adjust the highest power (the highest light of the bulb). Then you can connect antenna and audio signal. Adjust R1 until the audio sounds as loud as the other stations.

    The jumpers or DIP switches setting: pllfreq.txt.

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