Stabilized sweep frequency generator with adjustable start and s

Details Stabilized sweep frequency generator with adjustable start and s Stabilized sweep frequency generator with adjustable start and s

1980-10-01

1982-09-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 14, 331 17, 331 25, 331178, 307228, 328185, H03B 2300, H03L 712

Patent

active

043497896

ABSTRACT:
The oscillation frequency of a variable frequency oscillator is swept by a sweep signal from a sweep signal generator and the oscillation frequency is compared with a preset sweep start frequency for detecting coincidence therebetween. Upon detecting the coincidence, the sweep operation of the sweep signal generator is stopped and, at the same time, the oscillation frequency of the variable frequency oscillator is made by phase lock loop means to be phase-synchronized with a reference frequency. When the phase synchronization is established, an error signal in the phase synchronization is held and the loop of the phase lock loop means is cut off and then the error signal is applied to the sweep signal generator to re-start the frequency sweep of the variable freqency oscillator. When coincidence is detected between the oscillation frequency of the variable frequency oscillator and a preset sweep stop frequency, the sweep operation is stopped.

REFERENCES:
patent: 3504294 (1970-03-01), Martin, Jr.
patent: 3681706 (1972-08-01), Harzer
patent: 4038612 (1977-07-01), Borofka et al.
patent: 4130808 (1978-12-01), Marzalek

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