INDICATION DEVICE Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: indication device has sweep generator 1, first CRT 2, aerial 3, wide-band amplifier 4, first frequency discriminator 5, first and second differentiation circuits 6 and 7, mixer 8, intermediate frequency amplifier 9, first key 10, first scale-of-eight multiplier 11, first band-pass filter 12, first scale-of-eight divider 13, second band-pass filter 14, first multiplier 15, third band-pass filter 16, second scale-of-eight multiplier 17, fourth band-pass filter 18, second scale-of-eight divider 19, fifth band-pass filter 20, phase detector 21, low-pass filter 22, controlling signal former 23, element 24 of controlled delay, detector 25, delay element 26, second key 27, search unit 28, heterodyne 29, second frequency discriminator 30, phase inverter 31 of 90 deg, reference voltage generator 32, second CRT 33, third CRT 34, second amplitude detector 35, third frequency discriminator 36, third differentiation circuit 37, first single-polarity valve 38, first coincidence element 39, third key 40, second multiplier 41, sixth band-pass filter 42, first amplitude detector 43, first storage 44, first threshold unit 45, fourth key 46, information input 47, reset input 48, third scale-of-eight multiplier 49, first and second meters 50 and 51 of width of spectrum, comparator 52, second threshold unit 53, first analysis unit 54, OR gate 55, phase inverter 56, second single-polarity valve 57, second coincidence element 58, fifth key 59, seventh band-pass filter 60, third amplitude detector 61, second storage 62, third threshold unit 63, sixth key 64, second analysis unit 65, seventh key 66, third analysis unit 67, first, second and third analysis inputs 70,72,74, first and second outputs 71, 73 of analysis unit. EFFECT: expanded range of frequency search of signals without expansion of range of frequency re-tuning of heterodyne. 2 cl, 9 dwg