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Radio "R-251" (Dolphin) was produced since 1954. By design and design is similar to the "P-252" and "P-310" differing years of release and ranges. "R-251" is intended for interception of TLF or TLG signals in automobile radio centers and receiving points. Designed for round the clock work. The range is 1 ... 10 MHz. Sensitivity in TLG 2 mV, in SLT 5 mV. Power - electrical network or batteries. Dimensions of the receiver 550x400x420 mm, weight 66.5 kg.