A Digital Automatic Frequency Control Design

Abstract

The paper describes a digital automatic frequency control (AFC) system designed for use with almost any conventionally-tuned, high-frequency communications equipment. When connected to a high-quality equipment, such as an R-390 receiver, frequency accuracy and stability approaching that of frequency synthesizers can be obtained. The AFC system digitally counts the frequency of all frequency-determining oscillators in the controlled equipment, computes and displays the operating frequency to the nearest Hertz. When the AFC is engaged, any deviation of the computed operating frequency from the desired frequency causes an error correction voltage to be generated. Use of this system requires that the controlled equipment be modified for voltage trimming of the tuning oscillator.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1976
Accession Number
ADA026462

Entities

People

  • Glenn E. Ewing

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Accuracy
  • Amplitude Modulation
  • Automatic Frequency Control
  • Circuits
  • Control Systems
  • Decoding
  • Detectors
  • Electrical Engineering
  • Engineering
  • Frequency
  • Frequency Synthesizers
  • Integrated Circuits
  • Measurement
  • Semiconductors
  • Steady State
  • United States Naval Academy
  • Waveforms

Fields of Study

  • Engineering
  • Physics

Readers

  • Aerospace Test and Evaluation
  • Microwave Engineering.
  • Positioning, Navigation, and Timing (PNT) Technology.