Phase locked loop exciter generator for high frequency transmitt

Details Phase locked loop exciter generator for high frequency transmitt Phase locked loop exciter generator for high frequency transmitt

1976-05-05

1978-08-15

Griffin, Robert L.

Oscillators

Relaxation oscillators

325184, 331 18, 331 25, H04B 104, H03B 306

Patent

active

041076125

ABSTRACT:
A phase locked loop signal generator is especially adapted for synthesizing a selectable frequency signal for exciting an HF radio frequency transmitter to transmit over the seven marine telegraph bands. The signal generator includes an oscillator for providing a highly stable frequency standard. Another signal generator is responsive to the frequency standard and to frequency selector signals input by the operator for generating an exciter signal which is coupled to the transmitter for effecting the RF transmission within a predetermined frequency range. The exciter signal generator includes: a reference dividing circuit programmable in response to the frequency selector signals for providing a reference frequency signal having a frequency which is a fractional part of that of the frequency standard; a phase locked loop circuit having a frequency divider in the feedback loop which is responsive to the reference frequency signal for producing an intermediate signal having a frequency which is a multiple of that of the reference frequency signal; and an output divider circuit is coupled to the phase locked loop circuit and is responsive to the frequency selector signal for generating the exciter signal to be at a frequency which is a fractional value of that of the intermediate signal. By varying the frequency selector signal, over 5000 transmitting frequencies are available using a conventional harmonic-related transmitter.

REFERENCES:
patent: 2568412 (1951-09-01), Robinson
patent: 3641434 (1972-02-01), Yates et al.
patent: 3696422 (1972-10-01), Burrell
patent: 3710274 (1973-01-01), Basse et al.
patent: 3713040 (1973-01-01), Page, Jr.
patent: 3983484 (1976-09-01), Hodama
patent: 4009451 (1971-02-01), Moore et al.
patent: 4035727 (1977-07-01), Ishii

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