Computer Science – Sound
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987tdar.nasa...89n&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 89-93 (SEE N88-12679 04-32)
Computer Science
Sound
Cryogenic Cooling, Deep Space Network, Low Noise, Transmission Lines, Amplifiers, Antenna Design, Balloon Sounding, Field Effect Transistors, High Electron Mobility Transistors, Noise Temperature, Signal To Noise Ratios, Venus Atmosphere, Venus Probes
Scientific paper
New low-noise cryogenic input transmission lines have been developed for the Deep Space Network (DSN) at 1.668 GHz for cryogenically cooled Field Effect Transistors (FET) and High Electron Mobility Transistor (HEMT) amplifiers. These amplifiers exhibit very low noise temperatures of 5 K to 15 K, making the requirements for a low-noise input transmission line critical. Noise contribution to the total amplifier system from the low-noise line is less than 0.5 K for both the 1.668-GHz and 2.25-GHz FET systems. The 1.668-GHz input line was installed in six FET systems which were implemented in the DSN for the Venus Balloon Experiment. The 2.25-GHz input line has been implemented in three FET systems for the DSN 34-m HEF antennas, and the design is currently being considered for use at higher frequencies.
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