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Experiments in Very Low-Frequency Radio Propagation


Golden, Roger Morse (1959) Experiments in Very Low-Frequency Radio Propagation. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/E1C7-K279.


In an effort to extend experimentally determined data on the characteristics of very low-frequency radio waves, a vlf transmitting station (8.4 kc) was established at Shaver Lake, California. The establishment of this station permitted controlled experiments in long distance propagation, ionospheric vertical sounding measurements, and attempts at the generation of round trip gyroelectric-echoes. The long distance measurements indicated that at vlf, the ground or surface wave radiated by the antenna, can be detected at great distances. The ionospheric vertical incidence measurements showed rapid fading of the received signal around local sunrise and sunset. Propagation in the presence of the ionosphere is considered in the theoretical form of propagation in a homogeneous gyroelectric medium. The results of this analysis are tabulated in graphical form so that the dispersive qualities of the medium can be readily examined. With the aid of these results, an examination of the natural phenomena of whistlers is presented in order to determine the feasibility of generating gyroelectric-echoes. Reflection and transmission coefficients are presented for vertical incidence in order to ascertain the order of magnitude of such an echo. Experiments thus far performed have not yielded echoes but with modifications in the transmitting and receiving equipment, echoes may be detected. A complete description of the experimental equipment used is given along with a proposal for a more sophisticated receiving system.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Electrical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Langmuir, Robert V.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1959
Record Number:CaltechETD:etd-02022006-091215
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:457
Deposited By: Imported from ETD-db
Deposited On:06 Feb 2006
Last Modified:18 Oct 2023 19:16

Thesis Files

PDF (Golden_rm_1959.pdf) - Final Version
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