Accession Number:

AD0481352

Title:

AN INVESTIGATION OF A PHASE-LOCKED LOOP DEMODULATOR MODIFICATION TO A CONVENTIONAL COMMUNICATIONS RECEIVER

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Palmer, Harold

Report Date:

1963-01-01

Pagination or Media Count:

45.0

Abstract:

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.

Descriptors:

• *COMMUNICATION AND RADIO SYSTEMS
• *DEMODULATORS
• *PHASE LOCKED COMMUNICATIONS
• *TELETYPE SYSTEMS
• FREQUENCY MODULATION
• FREQUENCY SHIFT
• HIGH FREQUENCY
• INTERMEDIATE FREQUENCY AMPLIFIERS
• LOW PASS FILTERS
• PHASE DETECTORS
• RADIOFREQUENCY OSCILLATORS
• VERY HIGH FREQUENCY

Subject Categories:

• Electrical and Electronic Equipment
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE