  A short review of the history and the contemporary numerical calculations of
the operation of an electronic device for generation of electric oscillations
by negative differential conductivity of a supercooled below the critical
temperature superconductor. The superconductor is cooled below the critical
temperature at applied small constant electric field, which keeps the
superconductor in normal state. To simulate the device operation, beforehand
analytical expressions for the conductivity of nano-structured superconductors
supercooled below the critical temperature in electric field are used. The
numerical analysis meant to alleviate the development of a device shows that
the region of negative differential conductivity of the current voltage
characteristics leads to generation of electric oscillations. The study of
layered high temperature superconductors and radiated electromagnetic waves in
space will be an important problem of the future space technology.
