Other Availability: NTIS HC A09/MF AOI Journal Announcement: STAR8503 This report details the development of a 20-W solid state amplifier operating near 30 GHz. The IMPATT amplifier not only met or exceeded all the program objectives, but also possesses the ability to operate in the pulse mode, which was not called for in the original contract r equirements. The ability to operate in the pulse mode is essential for TDMA (Time Domain Multiple Access) operation. An output power of 20 W was achieved with a l-dE< instantaneous bandwidth of 260 MHz. The amplifier has also been tested in pulse mode with 507. duty for pulse lengths ranging from 200 ns to 2 micro s with 10 ns rise and fall times and no degradation in output, power. This pulse mode operation was made possible by the development of a stable 12-diode power combiner/amplifier and a single-diode pulsed driver whose RF output power was switched on and off by having its bias current modulated via a fast-switching current, pulse modulator. Essential to the overall amplifier development was the successful development of state-of-the-art silicon double-drift IMF'ATT diodes capable of reproducible 2.5 W CW output power with 127. dc-to-RF conversion efficiency. Output powers of as high as 2.75 W has been observed. Both the device and circuit design are amenable to low cost production. (B.W.) Source of Abstract (Subfile): NASA STIF Keywords: *AMPLIFIERS; *AVALANCHE DIODES: *RELIABILITY; ♦SOLID STATE DEVICES; BANDWIDTH; OSCILLATORS; PULSE MODULATION; SPACECRAFT COMMUNICATION ; TERMINALS Subject Classification: 7533 Electronics Electrical Engineering (1975-) COSATI Code: 9C Electronics & Electrical Engineering Compact welding apparatus with solar power supply. Abstract Only. Joint Publications Research Service, Arlington, Va. Corp. Source Code: J 1957394 In its USSR Rept.: Mater. Sci. and Met. <JPRS—UMS—84— 007) p 36 (SEE N85—12244 03-31). Oct. 1984. Translation Note: Translated to ENGLISH from Rabochaya Gazeta (Kiev), 23 Aug. 1984 p 1. Language: Eng1i sh. Country of Origin: U.S.S.R.. Country of Publication: Un i ted States Document Type: JOURNAL ARTICLE; TRANSLATION Most documents available from AIAA Technical Library Other Availability: NTIS HC A04/MF A01 Journa1 Announcement: STAR8503 A compact. device which Turkmen specialists developed is being used instead of bulky gas welding apparatus for welding girders. This device? produces gas from ordinary water by utilizing the solar energy. A welder can now travel with only a small case to a place where he is called. The conversion of welding apparatus to a solar power supply has substantially simplified this apparatus and made it more efficient. Photoelectric converters generate direct curren t whieh is n eed ed for the ch emi ca1 reaction of
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