NASA NTRS · 19880003307
A 2.3-GHz cryogenically cooled HEMT amplifier for DSS 13
Abstract
A prototype 2.3 GHz (S band) high electron mobility transistor (HEMT) amplifier/closed cycle refrigerator (CCR) system was installed in the DDS-13 feedcone, replacing the 2.3 GHz maser. The amplifier is cryogenically cooled to a physical temperature of 12 K and provides 31.5 K antenna system noise temperature and 29 dB of gain. The HEMT device used in the amplifier is a prototype.
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Tanida, L.. 1987-11-15. A 2.3-GHz cryogenically cooled HEMT amplifier for DSS 13. https://ntrs.nasa.gov/citations/19880003307
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