This small MW transmitter emits its signals at a distance of a few tens of meters, depending on the antenna. This antenna can be a 1 to 5 meter piece of wire. The coil consists of 80 + 20 turns 28 of wire 28 in a tube that slides over a 1 cm diameter ferrite rod. Tuning is done by shifting the coil. Modulation input is made by the jack. A small speaker can be used as a microphone.
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