Heterodyne receiver system

Details Heterodyne receiver system Heterodyne receiver system

1974-05-20

1976-01-13

Safourek, Benedict V.

325335, H04B 136

Patent

active

039328147

ABSTRACT:
An input signal and a local oscillator signal are supplied to a harmonic mixer. The local oscillator signal is swept over a frequency range. The output from the harmonic mixer is supplied to an intermediate frequency filter having a preselected frequency response, which provides an output signal when the difference formed by subtracting one of the input signal frequency and one harmonic frequency of the local oscillator signal from the other is equal to the intermediate frequency or when the difference formed by subtracting the other frequency from said one frequency is equal to the intermediate frequency as the local oscillator frequency is swept. By choosing a time interval between the times when the pair of intermediate frequency output signals are obtained, the order of that harmonic of the local oscillator signal with which the intermediate frequency output signal is obtained is determined depending on the frequency of the input signal. Thus, with a chosen time interval, when the frequency sweep of the local oscillator signal is interrupted with the later occurring one of the pair of the intermediate frequency output signals, the frequency of the local oscillator permits, together with the order of selected harmonic which corresponds to the chosen time interval and the direction of the frequency sweep, the frequency of the input signal to be determined. By using a definite time interval between the pair of intermediate frequency signals obtained and adjusting the rate of the frequency sweep, the order of the harmonic which is effective to obtain the intermediate frequency signals can be varied.

REFERENCES:
patent: 3110861 (1963-11-01), Hurvitz
patent: 3381243 (1968-04-01), Darlington
patent: 3391348 (1968-07-01), Kohler
patent: 3492584 (1970-01-01), Takahashi
patent: 3504294 (1970-03-01), Martin, Jr.
patent: 3701949 (1972-10-01), Turkish

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