Phase locked loop exciter generator for high frequency transmitter
US4107612A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1976 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | May 5, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0491
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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 generatin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.