| 摘要 |
FIELD: radio engineering. SUBSTANCE: invention refers to noise protection devices of receivers. Parametric converter presenting integration of two three-circuit parametric converters with low frequency harmonic pumping is based on common loop (filter). Circuit of first combination frequency of first three-circuit converter plays simultaneously function of signal circuit of second three-circuit converter. Given device is intended to limit high-power short-time radio pulse signals without phase distortion. Mentioned prototype is proposed to use as rejection filter which has capability for control over rejection band in it and over its location in amplitude- frequency characteristic of signal circuit (concentrated noise which changes in common case in time both width of spectrum value of carrier frequency is subjected to selective rejection). Control over rejection band and its location in amplitude-frequency characteristic of signal circuit in proposed filter is achieved by change of frequencies of voltages of pump oscillators incorporated in three-circuit converters. EFFECT: simplified operation of integration of rejection trough formed in amplitude- frequency characteristic of signal circuit with spectrum of concentrated noise (if noise changes only value of carrier frequency there will be necessary to adjust frequency of only one pump oscillator for such integration). |
