Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Patent
1980-07-01
1982-03-16
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
331 18, 331 25, 331179, 332 19, H03L 718, H03C 309
Patent
active
043203574
ABSTRACT:
A frequency synthesizer employing direct FM, as opposed to phase modulation, so subaudible tones may be transmitted, in the form of a 10 KHz increment, direct synthesizer with a skewed frequency standard deriving four intermediate 2.5 KHz tuning steps. Fast settling time of frequency change accommodates semi duplex operation, and a shaping network provides the amount of skewing changes required between band ends for substantially perfect tracking. A low division ratio programmed divider in the system maximizes transmitter signal to noise ratio, and a low pass filter in the synthesizer phase locked loop allows voice band moduation.
REFERENCES:
patent: 3626330 (1971-12-01), Zalonis
patent: 3713040 (1973-01-01), Page, Jr.
patent: 3967057 (1976-06-01), Tsukamoto et al.
patent: 3983484 (1976-09-01), Hodama
Crumrine Ralph J.
Cunningham Cole E.
Fredrickson Dennis L.
Triplett Gregory L.
Wulfsberg Paul G.
Grimm Siegfried H.
Kintzinger Warren H.
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