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This report summarizes the design of a 25kW peak power pulse modulator for an airborne medium--range weather radar. It is the purpose of the modulator to collect and store energy over a certain time period and to form this energy into a short, high-power pulse. The modulator is required to drive a coaxial magnetron with a pulse of 5kV at 5A. System considerations make a pulse width of 3.5us and repetition rate of 99Hz necessary. The pulse is generated in a line-type pulse circuit which utilizes an SCR as a switching device. It is shown that a solid-state modulator can use a commercial grade SCR for the pulse generation. Although currents of 100A are switched, the instantaneous power dissipation in the SCR is reduced significantly through the use of a saturable delay reactor. A pulse transformer is used to achieve maximum power transfer from the modulator to the magnetron. The pulse transformer is insulated with semi-rigid epoxy. Corona generation is avoided by limited the voltage gradients in the insulation to 80V/mil.

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1 v. (various paging) : ill. ; 26 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1972) from the Dept. of Electrical Engineering, University of Adelaide

Thesis (Ph.D. 1972) from the Dept. of Electrical Engineering, University of Adelaide.

Thesis (Ph. D.)--Oregon Health & Science University, Department of Science & Engineering, December 2008. / Includes bibliographical references (leaves 130 - 136).

Thesis (M.S.)--Rochester Institute of Technology, 1984. / Typescript. Includes bibliographical references (leaves 128-136).

Thesis (M.S.)--Oregon State University, 2006. / Printout. Includes bibliographical references (leaves 49-50). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 2006. / Printout. Includes bibliographical references (leaves 55-58). Also available on the World Wide Web.

[by] E.R. Kretzmer. / "This report is identical with a thesis of the same title submitted by the author in partial fulfillment of the requirements for the degree of Doctor of Science in Electrical Engineering at the Massachusetts Institute of Technology." / Bibliography: p. 238-239. / Army Signal Corps Contract No. W-36-039 sc-32037. Dept. of the Army Project No. 3-99-10-022.