The frequency of this transmitter depends on the coil. For 100 turns the operation is in medium waves. For values between 30 and 60 turns the operation is in short waves. Use wire 26 to 32 in a ferrite rod. The antenna depends on the frequency being telescopic or external, the power can be made with 4 batteries or battery. C3 may be an AM radio variable. C1 is 10 nF and C2 has values between 47 pF and 470 pF depending on the frequency. The transistor may be the BC548. R1 is 10k ohm. The circuit is from an old Argentine publication.
