DESIGN OF A DIGITAL CONTROL UNIT FOR AN NRL RECEIVING SYSTEM.
NAVAL RESEARCH LAB WASHINGTON D C
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To provide required receiver tuning accuracy a digital control unit for the receiver local oscillator was designed and constructed. The approach used a voltage-controlled oscillator in a closed-loop feedback system. The requirements were to control the receiver local oscillator from 175 MHz to 180 MHz in 1-kHz increments with provisions for both manual or computer control of the receiver. The digital control unit was breadboarded, using integrated circuits as the building blocks. The basic principle used to establish control of the local oscillator was the comparison of phase between a standard reference signal and a function of the local oscillator frequency. The error voltage established from this comparison was then used to control the local oscillator. Author
- Radio Communications