Receiver gain calibration

Details Receiver gain calibration Receiver gain calibration

1976-05-26

1977-06-21

Griffin, Robert L.

325 67, 325398, H04B 1700

Patent

active

040314693

ABSTRACT:
Receivers with bilateral input stages, such as microwave receivers that are used in noise and RF interference measuring instruments, are gain calibrated in the field by injecting a fixed level calibration signal at the IF frequency into the circuitry between the first mixer and first IF stage. The calibration signal is thus passed through the first mixer where it is converted to the tuned RF frequency and then to the RF input port where its power is measured to control a variable attenuator in series between the calibration signal source and the receiver IF stages. The attenuator is thus automatically adjusted so that the level of the calibration signal entering the IF stage balances the losses in the receiver front end, and a variable gain IF amplifier may be adjusted to produce a predetermined level on the receiver output meter to properly calibrate the instrument.

REFERENCES:
patent: 3273065 (1966-09-01), Stover
patent: 3559071 (1971-01-01), Mead et al.
patent: 3624506 (1971-11-01), Townsend

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