Calibratable heterodyne receiver

Details Calibratable heterodyne receiver Calibratable heterodyne receiver

1973-07-05

1977-02-01

Richardson, Robert L.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324130, H04B 126

Patent

active

040064204

ABSTRACT:
A calibratable heterodyne receiver can be adjusted to a calibration mark or similar entity of an indicating device connected to the output of the receiver during feeding of a calibration alternating current with the help of adjusting means which change the gain of the amplifier. The calibration alternating current frequency is adapted during each calibration to the tuning frequency and is obtained by means of mixing the output voltage of the heterodyne oscillator with an auxiliary voltage which corresponds to the intermediate frequency. The auxiliary voltage is tapped from an intermediate frequency stage of the receiver and is derived by way of a limiting circuit which is constructed and dimensioned in such a way that a calibration voltage amplitude and calibration voltage phase results which causes self oscillation around the circuit.

REFERENCES:
patent: 3012197 (1961-12-01), Peterson et al.
patent: 3310744 (1967-03-01), Miller
patent: 3486112 (1969-12-01), Bayer
patent: 3524995 (1970-08-01), Von Recklinghausen

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