A Sample and Hold Technique for Automatic Frequency Control in Binary Data Transmission Systems.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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A method of driving a voltage for automatic frequency control of a radioteletype receiver-converter is developed and tested. By sampling and holding the amplitude of the Mark and Space signals out of an FSK detector, comparing and integrating their difference, an error correcting voltage results which is less sensitive to noise and selective fading than the AFC voltage derived in the usual way. A sample-and-hold circuit is described. Comparative performance tests, with data in the form of strip-chart recordings, confirms the claims made for the technique. Author
- Non-Radio Communications