P-407M Receiver/Transmitter
The Russian P-407M is a single channel full duplex 2 or 4 wire radio-relay station using tubes. Frequency range 52-60MHz, channel spacing 50kHz. Modulation FM R/T. Output Power 1 Watt. AF bandwidth 0.3-3.4 kHz. Ringing tone 30-50Hz. Powered by two 2.4V rechargeable batteries.