A STUDY OF VOR REFLECTION CHARACTERISTICS

Abstract

Frequently a VHF omnidirectional range (VOR) station must be located at a site which is far from desirable. The 4-loop VOR installation at Charleston, S. C., was situated at the center of a 2,000-ft-diameter cleared space in a wooded area. The station could not be commissioned because of excessive course scalloping, and the condition was not improved greatly even by mounting the antenna system on top of a 75-fthigh counterpoise 150 ft in diameter. Tests were conducted with a vertical screen made of horizontal wires to determine the effectiveness of a large counterpoise 75 ft high in reducing scalloping caused by reflecting objects beyond 1,000 ft from a VOR antenna. It is recommended that no further consideration be given to using a counterpoise 150 ft in diameter and 75 ft high for reducing course scalloping caused by objects greater than 1,000 ft away from a 4-loop VOR antenna. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1961
Accession Number
AD0258736

Entities

People

  • John Turk
  • Sterling R. Anderson

Tags

DTIC Thesaurus Topics

  • Diameters
  • Omnidirectional
  • Radio Navigation
  • Reflection

Readers

  • Aerospace Test and Evaluation
  • Coastal and Marine Engineering/Sediment Transport/Hydraulic Engineering
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering

Technology Areas

  • Space
  • Space - Space Objects