A 600-Ohm multiple-wire delta antenna for ionosphere studies

Abstract

This paper describes t he design and the performance of a multiple-wire delta antenna developed for use with high output impedance, vert ical-incidence ionosphere sounding equipment. Graphs are presented showing the terminal impedance of this antenna over the separating frequency range (1 to 25 megacycles) , using various lengths of open-wire transmission line. The results of pattern measurements using model tech niques are given , showing the expected radiation characteristics of the full-scale antenna. A practical test of the comparative merits of the antenna is described in which ionosphere records obtained by the u se of this antenna are compared with those obtained by the use of a larger antenDa developed p reviously.

Radio communication via Near Vertical Incidence Skywave propagation: an overview

“…In fixed installations this is acceptable: the effort in mechanical engineering is balanced by a large reduction in required transmitter power, as well as an improvement immunity to interference and radio noise on reception. NVIS antennas suitable for fixed installations are the Delta antenna [57], the vertical Rhombic antenna [58, pp. 11.7-11.16], and the Log-Periodic Conical Spiral antenna [59].…”

A reliable ionosonde for continuous automatic operation

“…Finally, there is the question of an antenna. The delta antenna introduced by Cones [ 1949] (also see Cones et al [1950], and C-ones [1951]), remains the best choice. Its only serious challenger has been the log periodic dipole array, but, for simplicity of construction and modest mast height, the delta is superior.…”

Near vertical incidence skywave

“…In fixed installations this is acceptable: the effort in mechanical engineering is balanced by a large reduction in required transmitter power, as well as an improvement immunity to interference on reception. NVIS antennas suitable for fixed installations are the Delta antenna [Cones, 1950], the vertical Rhombic Antenna [Johnson, 1993, pp. 11.7-11.16], and the Log-Periodic Conical Spiral Antenna [Dietrich, 1969].…”