Reduction of Cross Modulation at DAJ Stations by the Use of Antenna Coupling Transformers

Abstract

Cross modulation interference was experienced early in the operation of the DAJ direction finder stations. One of the stations most seriously affected was at San Juan, Puerto Rico, where three broadcast stations were within several miles of the d.f. arrays. Tuned filters were successfully employed between the antenna and the cathode follower to eliminate the interference but because of excessive attenuation (6-10 decibels) in the high frequency band they were considered unsatisfactory for general use. Studies were instigated to find means of improving the cathode follower and at the same time to develop a suitable replacement for it.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1946
Accession Number
AD1204344

Entities

People

  • M. L. Musselman
  • R. L. Haskins

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Accuracy
  • Arrays
  • Cathode Followers
  • Circuits
  • Cross Modulation
  • Direction Finders
  • Frequency
  • Frequency Bands
  • Gain
  • Impedance
  • Losses
  • Measurement
  • Military Research
  • Modulation
  • Networks
  • Signal Generators
  • Transmitters

Readers

  • Astronomy and Astrophysics.
  • Electronics Engineering
  • Radio communications and signal processing.