The output power of this wireless intercom for the 27 MHz (11 meters) range is in the order of ½ W, providing a range of around 2 km. The coils L1, L2 and L3 are the same, consisting of terminals 1 to 2 - 6 turns, terminals 2 to 3 4 turns. Secondary pins 4 to 5 - 5 turns all in 0.5 cm plastic form with adjustable ferrite core. The wire can be 26 or 28. The circuit is powered by 9 V of small or medium batteries.
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