AIRCRAFT RADIO DIRECTION FINDING AND HOMING SYSTEMS IN THE 40-100 MC RANGE

Abstract

Homing-antenna systems were developed for Navy type AF and P4M aircraft. The antenna was a partial-sleeve type with an input impedance varying from about 20 ohm at 100 mc to 120 at 40 mc. Tuning was accomplished by a remotely operated condenser, and fixed tuning over about a 20-mc band seemed possible. A received field intensity of about 60 db below the freespace value was estimated for an aircraft at 1200 ft and a distance of 100 mi. Satisfactory homing operation was indicated for a pair of the antennas flush-mounted or faired-in on the wing leading edges. Rudder mounting for vertical-polarization homing was less satisfactory. Phase-shift and amplitude-comparison RDF systems were also investigated; both use the homing-system wing-edge antennas as well as pairs of tail- or fuselage-mounted partial sleeves. The systems gave bearings which were accurate in 40 deg azimuth sectors off the nose and each wing tip. Correct sector identification was always obtained.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1953
Accession Number
AD0012031

Entities

People

  • D. Royal
  • N. Yaru

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Angle Of Arrival
  • Antennas
  • Direction Finders
  • Direction Finding
  • Directional Antennas
  • Electric Fields
  • Frequency
  • Frequency Bands
  • Fuselages
  • Horizontal Stabilizers
  • Leading Edges
  • Measurement
  • Radar
  • Radiation Patterns
  • Transmission Lines
  • Transmitters

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Inertial Navigation Systems.
  • Radar Systems Engineering.