4km FM Transmitter
This is a VCO FM Transmitter. 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. To calibrate for
maximum power connect 6 V / 0,1 light bulb to the output and use R1 to
tune the right frequency, adjust L1 coil if necesary. 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.
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
- 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
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