The transmitter shown can reach around 100 meters depending on the location and sensitivity of the receiver. It also influences the existence of many stations on the site and sources of interference. The circuit can be powered by 4 small batteries and function as a good steering microphone. The antenna is of the telescopic type or a 15 to 40 cm piece of rigid wire. All capacitors must be ceramic, and the coil consists of 4 turns of 20 AWG with 1 cm in diameter without core. In the 2-20 pF trimmer, the operating frequency of this transmitter is adjusted.
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