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Radio station "Angstrom-ON" was produced presumably since 1974. For the KGB. Open Wear. 8 channels in the band 168.5 ... 171.125 MHz. Power 0.5 watts. Sensitivity 0.5 µV. Tone call. Single inversion of the speech spectrum. The reference inversion frequency is 3706 Hz. The noise canceller is controlled by a pilot signal (tone transmission with a frequency of 1853 Hz and a length of 250 ms, which is generated each time it is switched on for transmission) and the presence of noise in the absence of a carrier signal. The dimensions of the radio station are 196.5x65.5x24.5 mm, its weight is 750 g. Power 8 volts. The radio station was produced until the beginning of 1992.