Hughes Model 914H TWT.
HUGHES AIRCRAFT CO TORRANCE CALIF ELECTRON DYNAMICS DIV
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The primary objective of the 914H program was to design and build a 200 watt CW, PPM focused, coupled cavity TWT operating over the frequency band of 30.0 to 31.0 GHz. This work was related to earlier Hughes developed millimeter-wave tubes, and the design and experience gained on these programs represented the design baseline for the 914H TWT. As part of the early development effort, a study was performed to design the RF circuit and electron gun. Several computer programs were used to define the cavity dimensions and the circuit configuration to optimize efficiency, bandwidth and gain. The RF circuit was cold tested and optimized at X-band and then scaled up to Ka-band. The electron gun design was performed and evaluated in the demountable beam tester. In addition, windows, transformers, PPM focusing, collector and cooling systems were designed during this program. Upon completion of the tube design, two RF tubes were built, tested and delivered. The two 914H TWTs were tested CW and demonstrated excellent beam focusing and RF performance. Power output in excess of 160 watts across the frequency band has been demonstrated on both tubes. Author
- Electrical and Electronic Equipment