This small experimental transmitter can send its signals to distances up to 100 meters. L is formed by 8 turns or AWG 16 wire in a card board form with diameter of 1 cm. The length of the antenna can range from 80 cm to 2 m. Xtal must have frequencies between 7 and 14 MHz. Any trimmer from 20 to 50 pF can be used to tune the circuit.
