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Radio station "Angstrom-SN" was produced presumably since 1974. For the KGB. Hidden 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 squelch is controlled by the pilot signal and the presence of noise in the absence of a signal. Power 8 volts. The design of the PC is somewhat different from the PC "Angstrom-ON", here, respectively, the dimensions and weight are smaller.