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3,5 MHz Emitter

3,5MHz emitter
This transmitter has a range between 15 and 50 meters depending on operating band. L1 has 40 turns to the band of 3.5 MHz, 20 turns for the 7 MHz and 10 turns for the 14MHz band. The core of the inductor is a ferrite rod 1 cm in diameter and 5 cm lingitud. The wire is 28 AWG. The trimmer capacitor Cv is a common and telescopic antenna is 30 to 80 cm long. In the modulation have an output transformer with primary transistor 200 to 1000 ohms and the microphone is a common loudspeaker.