FEASIBILITY OF DESIGN OF OMEGA ANTENNAS BY FERRITE-LOADING TECHNIQUES
Technical rept. Jan 1964-May 1965
ITT FEDERAL LABS NUTLEY NJ
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Ferrite-loading techniques for transmitting antennas were investigated extensively for application to the design of VLF, LF, and HF radiators. In a previous technical report the theoretical analysis of linear loading was developed. Experimental verifications conducted at H.F. 2 to 26 mcs provided excellent agreement with the theoretical calculations. On the basis of these results, a design of transmitting antenna system for Omega application was developed. This consisted of a cage-type structure built with 500-ft ferrite-loaded monopoles, supported by means of 500- or 650-ft towers. To provide a check of the validity of the extrapolation, an experimental investigation of a low-frequency antenna representing approximately a 10-to-1 model of the proposed Omega system was undertaken. After a thorough study of ground-plane techniques and requirements, a site was selected at Nutley, NJ. and a 100-fthigh vertical monopole using ferrite-loading techniques was built. Permission for the erection of the required 100-ft towers was granted. Although, at the date of the writing of this report, the investigation of the properties of this transmitting system is not completed, a wealth of experimental results of great technical significance was obtained.
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