Collective farm radio center KRU-10.
Amplifying and broadcasting equipmentThe collective farm radio center "KRU-10" from the beginning of 1950 produced the Petropavlovsk plant named after Kirov. For the radio transmission of large collective farms located in rural areas without electricity and non-permanently operating power grids, the radio industry produced the KRU-10 radio broadcasting unit. It could serve up to 200 radio points equipped with economical loudspeakers. The radio unit includes a receiving and amplifying device, a power supply, a lightning protection shield, two acid / alkaline 12 V rechargeable batteries with a capacity of 60 a / h each, a control loudspeaker of the `` Sever '' type, a pair of headphones, a set of connecting hoses, spare parts lamps, vibrators, lightning arresters, fuses). KRU provides broadcasting of radio stations of central and regional broadcasting, operating in the DV, SV and HF bands, reproduction of gramophone records using a pickup, as well as transmission from a microphone (a control loudspeaker can be used as a microphone). The glow of the switchgear lamps is powered by one acid cell or two alkaline battery cells. Anode voltage is obtained from 2 synchronous vibration transducers powered by the rest of the battery. Charging is carried out through a selenium rectifier available in the power supply unit from a three-phase alternator GPM-130, a wind power unit VE-2 or an alternating current network. In this case, voltage is applied to the selenium rectifier through a step-down transformer.
