Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1977-04-21
1978-06-20
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 23, 331 25, 331 65, 331116R, 343 5AF, 343 5ST, H03B 304
Patent
active
040964450
ABSTRACT:
A vibration noise filtering system for use in airborne radar master oscillator, RMO, systems is disclosed. Master and slave crystal oscillators are used, the slave oscillator being phase locked to the master oscillator governed by a phase locked loop, PLL, having a predetermined low frequency bandwidth. The master oscillator is structurally coupled directly to a source of vibration of the aircraft, while the slave oscillator is isolated and supported from the vibration source by a mechanical passive isolator having a resonant frequency well within the low frequency bandwidth of the PLL. The output of the slave oscillator which is the source of the RMO signal has a phase spectral density within the phase stability requirements of a typical RMO across the operating modulating frequency ranges of both air-to-ground and air-to-air radar modes.
REFERENCES:
patent: 3606233 (1971-09-01), Scharton et al.
patent: 3807678 (1974-04-01), Karnopp et al.
patent: 3931585 (1976-01-01), Barker et al.
Hopwood Francis W.
Muhlbaier John P.
Rossman Herman
Grimm Siegfried H.
Patterson H. W.
Westinghouse Electric Corp.
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