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Radio "NKS" from 1935 produced the Alexander Radio Factory â„– 3 Naromsvyaz. Special receiver type "NKS" and amplifier type "UPP", designed to work with the receiver, with the device automatically recording the radio telegram on the telegraph tape. The maximum transmission speed can be increased to 300 words per minute. In order to combat fading, the radio receiver is equipped with an automatic gain control and it is possible to simultaneously receive stations on three separate antennas. Receiver "NKS" and amplifier "UPP" are powered from common batteries with voltage of 160, 40 and 6 V. Amplifier "UPP" amplifies and rectifies the signals received by the receiver, then these signals are fed to the recording part of the installation. The amplifier "UPP" can be connected to the receiver of any type. The cost of the receiver "NKS" with amplifier "UPP" - 3000 rubles.