With ½Jgang, the frequency of this low-cost shortwave transmitter can be adjusted from 10 MHz to 15 MHz. The capacitor VC1 determines the carrier frequency of the transmitter, combined with the inductor L1. At the same time, VC2 can be used for frequency adjustment. The carrier is amplified by the transistor T4 and coupled to the RF amplifier transistor T1 (BD677) through the transformer X1.
