Marker circuit

Details Marker circuit Marker circuit

1975-04-14

1977-06-07

Farley, Richard A.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

307233R, 328134, 328138, G01R 1330

Patent

active

040285871

ABSTRACT:
A circuit is provided for use with a swept frequency test system to produce a marker on the system display when the swept frequency signal reaches one or more predetermined reference frequencies. The marker circuit mixes the swept frequency signal with a reference frequency signal to produce a beat frequency signal or birdie, and a frequency detecting circuit detects when the frequency of the birdie is below a predetermined frequency. When this occurs a marker pulse is generated for use in the system display.

REFERENCES:
patent: 3500369 (1970-03-01), Kellam
patent: 3515996 (1970-06-01), Nixon et al.
patent: 3596193 (1971-07-01), Durwoodie
patent: 3611157 (1971-10-01), Hughes
patent: 3772534 (1973-11-01), Dellecave et al.

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