Interim development rept. no. 3, 27 Dec 63-27 Mar 64.
SPERRY RAND CORP CLEARWATER FLA SPERRY MICROWAVE ELECTRONICS DIV
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The C-band materials investigation has been virtually completed. The vertical slab geometry was judged unsatisfactory in C band at one megawatt peak power. However, a horizontal slab ferrite geometry, utilizing a slab in each of the four corners of the waveguide, was found to provide a switching bandwidth greater than 10 with no evidence of subsidiary resonance at one megawatt. Subsequent work in C band has used the horizontal slab configuration. Tests of a modified C-band waveguide T-junction indicate that a 10 bandwidth can be obtained for the SPDT switch. The center frequency of the switch is a function of the distance from the T-junction to the abrupt transition to the SPST element. The T-junction is being modified to adjust this frequency to 5.65 Gc. The abrupt junction C-band SPST element has been matched satisfactorily over a 10 frequency range for the zero field transmitting condition by using a shunt capacitance a short distance from the reduced area waveguide. Additional switching data was taken with the S-band SPST switching element. Ferrite length was increased to approximately eight inches to achieve the desired switching bandwidth. An S-band magnetron was put into service and will be used in the high power development of the S-band switch. A test electromagnet was fabricated with solid iron core. A turn-off time of 200 microseconds was observed. Author