Comparison of AM and Narrow-Band FM UHF Communication Systems. Appendix B - Theoretical Considerations

Abstract

The characteristics of a-m and f-m communication systems are discussed and compared from a theoretical viewpoint. Topics treated include capacity for transmission of information, spectrum of a-m and f-m waves, propagation, modulation distortion, multipath, distortion, channel-spacing considerations, signal-to-noise ratios, effect of pre-emphasis and de-emphasis, performance in the presence of impulse noise, common-channel interference, off-channel interference, and cross modulation. A summary theoretical comparison of the two types of systems is presented in tabular form. The discussions apply directly to naval voice communications systems operating in the VHF/UHF bands, but are presented in sufficiently general form for application to other types of systems.

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Document Details

Document Type
Technical Report
Publication Date
Mar 17, 1950
Accession Number
AD1207271

Entities

People

  • Robert M Maiden

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Channel Spacing
  • Communication Systems
  • Communications Techniques
  • Cross Modulation
  • Distortion
  • Impulse Noise
  • Modulation
  • Noise
  • Ultrahigh Frequency
  • Voice Communications

Fields of Study

  • Physics

Readers

  • Business Analytics
  • Radio communications and signal processing.

Technology Areas

  • Space