Accession Number : ADP005411

Title :   Design Considerations for the Beamwaveguide Retrofit of a Ground Antenna Station,

Corporate Author : JET PROPULSION LAB PASADENA CA

Personal Author(s) : Veruttipong,T. ; Withington,J. ; Galindo-Israel,V. ; Imbriale,W. ; Bathker,D.

Report Date : FEB 1987

Pagination or Media Count : 24

Abstract : 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 gain/spillover 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.

Descriptors :   *ANTENNA FEEDS, KA BAND, SIGNAL TO NOISE RATIO, GROUND STATIONS, X BAND, PREAMPLIFIERS, S BAND

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE