MISCELLANEOUS STUDIES IN ELECTRICAL TRANSMISSION NETWORKS.
HARVARD UNIV CAMBRIDGE MASS UNDERWATER SOUND LAB
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This report collects several miscellaneous studies made in support of various apparatus development projects undertaken by the Harvard Underwater Sound Laboratory HUSL. The first section on networks having linear phase shift brings together some material scattered in the literature and presents new data concerning a bridged-T linear phase-shift circuit which is easy to construct. A standard lag line is described which has proved to be useful in phase-shift determinations in the ultrasonic frequency range. Another application of linear phase-shift networks is presented in connection with artificial lines utilized for the production of short pulses. Although only limited experimentation was devoted to these pulse-forming networks, they appear to have a promising future and recommendations are made concerning their design. The first part of the report concludes with discussion of an unpublished method of producing two signals differing in phase by 90 degrees over a considerable frequency range. An extension of this method is proposed which seems capable of improving materially the accuracy of the quadrature phasing. The second part of the report deals with considerations in transformer design for ultrasonic frequencies. Portions of this treatment are not novel, but it has proved valuable to have available a coherent presentation of the whole design problem for wide-band untuned transformers.
- Electrical and Electronic Equipment