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Radio Radio "Ether 48" from the II quarter of 1948 produced an experimental series of the Alexander Radio Plant. The "Efir-48" battery radio receiver is a five-lamp superheterodyne with a universal power supply. In the radio receiver, very economical lamps of direct heat of the finger series 1A1P, 1B1P, 1K1P, 2P1P were used. The receiver has 2 ranges DV and CB, switched by means of buttons. The frequency ranges are 152 ... 400 kHz and 500 ... 1200 kHz, respectively. The intermediate frequency is 110 kHz. In the front cover is a folding whip antenna height of 400 mm. Reception of powerful radio stations can be made with the antenna folded. The operating position of the receiver is vertical or horizontal, with the front cover open. The receiver is made in the form of a small elegant suitcase with dimensions of 200x150x90 mm with opening lids, front and rear. Under the front cover of the radio receiver there is a control panel with a loudspeaker window, a knob, a volume knob, a power button, a scale and a button-type switch. In its electrical parameters, the device approaches the battery receivers of class 2. Uncorrupted power output with fresh batteries is 100 ... 130 mW. The sensitivity of the receiver with an expanded pin averages 1 ... 2 mV / m, which ensures the reception of local and powerful not particularly remote stations. When using a indoor or outdoor antenna, the sensitivity of the receiver increases to 30 ... 50 µV. Selectivity, with detuning on and - 10 kHz is 26 ... 30 dB. The attenuation of the mirror channel is at least 26 dB. Anode current consumption with fresh batteries is 10 ... 12 mA; filament current 180 mA. When powered by 110 or 127 V mains, the receiver consumes about 10 watts. The mass of the equipped radio receiver is about 2.5 kg.