A digital automatic frequency control design.
Ewing, Glenn Everette
Jauregui, Stephen, Jr.
MetadataShow full item record
This 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.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Song, G.; N. Buck; Agrawal, B.N. (1997);Minimizing vibrations of a exible spacecraft actuated by on-off thrusters is a challenging task. This paper presents the rst study of pulse-width pulse-frequency modulated thruster control using command input shaping. ...
Marshall, Steven Alfred (Monterey, California. Naval Postgraduate School, 1974);A frequency-modulated radar is a radar in which a continuous-wave transmission is frequency modulated in a known manner in order to obtain range information. When the frequency modulation is linear with time, the ...
A method for accurate receiver tuning and precise measurement of the carrier frequency of voice-modulated, suppressed-carrier, single-sideband radio signals Day, Lucius Boyden, Jr. (Monterey, California; Naval Postgraduate School, 1970);A well known problem associated with suppressed-carrier single sideband (SSP) communications is the difficulty of accurately tuning a receiver to the suppressed-carrier frequency of the transmitter is this frequency is not ...