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Portable radio stations "Karat" and "Karat-M" were produced presumably from 1977 and 1981. "Karat" and "Karat-M" - portable single-channel radio stations for radio telephone communication in agriculture, forest industry, geological service, etc. The radio stations are powered by a battery pack consisting of 8 R-20 elements. In the Karat-M radio station, in contrast to the Karat radio station, radio cascades, with the exception of the ULF output cascade, are made on microchips. Specifications: Frequency range: 1.6 ... 2.85 MHz. Output power: 500 mW. Sensitivity: 3 µV. Power consumption: reception (Carat) 0.45 W, (Carat M) 0.55 W, transmission 2.5 W. LF (sound) output power: "Karat": 50 mW (at SOI 10%), "Karat-M": 100 mW (at KNI 7%. Communication range: up to 7 km with whip antennas, up to 30 km and more antennas of the type of a collar beam. The dimensions of the radio station are 232x98x105 mm, the mass is about 1.1. "Niva-M" and others.