Rodina-47 1947
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The radio receiver battery "Homeland-47", another name "Elektrosignal-3" from 1947 produced the Voronezh plant Elektrosignal. The new receiver '' Motherland-47 '' differs from the previous Motherland model mainly in appearance, but there are other changes. The HF range of the new model is expanded from 25 to 70 meters. A filter is included in the antenna circuit to reduce interference on the frequency converter; the circuit design of the low-frequency amplifier is improved; a convenient horizontal scale is applied. It is possible to connect an additional loudspeaker. The speaker can also be used to listen to transmissions of the broadcasting line, which is connected to the jacks of the extension loudspeaker. Receiver power supplies are placed outside the box. Wave bands: LW 150 ... 410 kHz, CB 520 ... 1500 kHz, KV 4.3 ... 12 MHz. IF 460 kHz. The sensitivity of the model is 10 ... 70 µV, depending on the range and factory settings. Selectivity on the adjacent channel is 20 dB, on mirror channels on DV 26 dB, CB 20 dB, KV 10 dB. The nominal output power at SOI = 10% is about 200 mW. The current consumed by the heat of 0.5 A, the anode 8 mA. In 1950, the receiver was upgraded, the name and its appearance remained the same. The scheme was changed, the selectivity of the mirror channels was improved, the nominal output power was increased to 250 mW, the frequency response of the LF amplifier was improved.
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Information from collection of Valery Khartchenko