Design Considerations for the Beamwaveguide Retrofit of a Ground Antenna Station,
JET PROPULSION LAB PASADENA CA
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A primary requirement of the NASA Deep Space Network DSN is to provide for optimal reception of very low signal levels. This requirement necessitates optimizing the antenna gain to the total system operating noise level quotient. Low overall system noise levels of 16 to 20 K are achieved by using cryogenically cooled preamplifiers closely coupled with an appropriately balanced antenna gainspillover design. Additionally, high-power transmitters up to 400 kW Cw are required for spacecraft emergency command and planetary radar experiments. The frequency bands allocated for deep space telemetry are narrow bands near 2.1 and 2.3 GHz Ka-band, 7.1 and 8.4 GHz X-band, and 32 and 34.5 GHz Ka-band. In addition, planned operations for the Search for Extraterrestrial Intelligence SETI program require continuous low-noise receive coverage over the 1 to 10 GHz band. To summarize, DSN antennas must operate efficiently with low receive noise and high-power uplink over the 1 to 35 GHz band.
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