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Short-wave radio "R-250M" (Kit) produced since 1957. For the Navy, the name "R-670M" (Rusalka-M). The RP is an upgrade of the R-250 receiver. Slightly changed the design of the front panel. Increased sensitivity in TLF and TLG modes. Additional measures have been taken to improve stability. Ranges as the predecessor. Changed the design and design of the power supply. Increased adjustment of the band on the inverter to 14 kHz.