Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1980-07-07
1982-03-16
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
455 67, H04B 1700
Patent
active
043205321
ABSTRACT:
An apparatus for automatic monitoring of superheterodyne radio receivers, comprising a unit for shaping the tune-in frequency signal of the receiver, units for shaping the signals of adjacent channels, and units for shaping the signals of additional channels, their outputs being connected through an adder to the input of the receiver to be tested. Each of the units includes a master oscillator, a mixer with the heterodyne output of the receiver connected thereto, and a filter. Each of the units for shaping the signal of an adjacent channel includes, in addition to the master oscillator, mixer and filter, a second mixer and a shift generator. The apparatus further comprises a desired signal shaper connected to the modulation input of the master oscillator of the tune-in frequency signal shaping unit, two sets of interference signal oscillators connected to the modulation inputs of the master oscillators of the units for shaping the signals of adjacent channels and of the units for shaping the signals of additional channels, respectively, a reference oscillator, and phase-locked loops connected between the reference oscillator and the master oscillators of the signal-shaping units. Connected to the output of the receiver to be tested are a linear distortion analysis unit and a nonlinear distortion and interference analysis unit with their outputs connected to an indicating unit.
REFERENCES:
patent: 2891217 (1959-06-01), Grieg
patent: 3467866 (1969-09-01), Palatinus
patent: 3755741 (1973-08-01), Stove
Measuring System for Automated Production Tests of Broadcast Receivers, Voprosy Elektroniki, Series TRPA, vol. 2, 1975, p. 27031.
Bank Mikhail U.
Berezjuk Iraida K.
Bessonov Alexei F.
Guzikov Sergei D.
Odnolko Mikhail V.
Chin Tommy P.
Greenspan Myron
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