AN INVESTIGATION OF A PHASE-LOCKED LOOP DEMODULATOR MODIFICATION TO A CONVENTIONAL COMMUNICATIONS RECEIVER
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Expensive equipment procurement programmes have been required by the armed services to keep their communications receiving equipment compatible with current operating standards. This paper applies the results published in recent literature on the analysis and evaluation of the phase-locked loop demodulator to investigate the feasibility of improving the stability and selectivity characteristics of an aging communications receiver for satisfactory use in modern frequency-shift radio-teletype circuits. The phase-locked loop used in analyzed and the loop circuits and modifications to the basic receiver are discussed. Frequency spectra photographs are included of the IF signal in the receiver for square-wave and sine-wave modulating signals.
- Electrical and Electronic Equipment
- Non-Radio Communications