Parametric amplifiers provide low system noise temperature for both main tracking and acquisition antennas; noise temperature of 170 K is achieved without cooling; units are housed in weatherproof, pressurized containers to allow mounting without weather protection; network is designed to measure noise figure or inject test signals while receivers are connected to antenna terminals; arrangement also allows more realistic tests of signal threshold.
Parametric amplifier, and noise figure and test signal network
NASA SP
1965
11 pages
Report
English
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