3-PEM-5 1972
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The electric megaphone "3-PEM-5" since 1972 produced the Dnepropetrovsk Radio Plant. The device is designed for short-term hands-free directional speech transmission. It is recommended to use it when transmitting speech in an open space or in large enclosed spaces. The rated output power of the amplifier is 3 watts. The duration of work with one power source during transmission-silence mode is 1:10, when using batteries 15 hours, when using A-316 cells - 8 hours. The range of legible audibility is 150 ... 200 meters. The working band of sound frequencies is 710 ... 3150 Hz. The dimensions of the electric megaphone are 193x275x260 mm. Weight with batteries - 1.6 kg. ,null,ru,null,null,null,null
Documentation:
Information from collection of Valery Khartchenko