Kh1-1A (Izmeritel' chastotnykh kharakteristik) 1968
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The meter of frequency characteristics "X1-1A" has been produced since 1968. The meter is intended for research and adjustment in laboratory or field conditions of active and passive two-port networks in the frequency range of 1 ... 250 MHz using their frequency response observed on the screen of the cathode ray tube of the instrument.
Documentation:
Information from collection of Valery Khartchenko