NASA/Lyndon B. Johnson Space Center, Houston Texas, 77058-3696, Mail Code: BH

58 -- X-38 GPS ANTENNAS SOL 9-BH13-44-9-23P DUE 073099 POC Eric W. Lewis, Contract Specialist, Phone (281) 483-0575, Fax (281) 244-5331, Email eric.w.lewis1@jsc.nasa.gov -- Yolande B. Harden, Contracting Officer, Phone (281) 483-9953, Fax (281) 244-5337, Email yolande.b.harden1@jsc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/JSC/date.html#9-BH13-44-9-23P. E-MAIL: Eric W. Lewis, eric.w.lewis1@jsc.nasa.gov. NASA/JSC plans to issue a Request for Quote (RFQ) for 16 space-qualified hemispherical passive Global Positioning Satellite (GPS) antennas operating at the GPS L1 frequency of 1575 MHz +/- 10.5 MHz with the option to buy passive antennas at GPS L1/L2 frequencies centered at 1575 MHz and 1227 MHz. Four flight antennas will be integrated into the X-38 V-201 vehicle. The physical requirements include the envelope of approximately but not limited to =" height with 2.5" x 2.5" area for L1 only antenna and = " height with 3.5" x 3.5" area for L1/L2 antenna. The free space antenna performance requirements are right-hand circular polarization, antenna gain shall be greater than or equal to 0 dBic up to +/- 45 : beamwidth (from boresight), greater than -3 dBic up to +/- 60 : beamwidth and greater than -6 dBic up to 75 : beamwidth and less than 5 dB axial ratio up to +/- 60 : from boresight. The relative phase angle error shall vary less than 5: at any given angle up to +/- 60 : from boresight within the set of antennas. The absolute phase tracking shall vary less than 5: at boresight over a -80 : to 217: F temperature range for each antenna. The environmental requirements include operating in the temperature range of -80 0F to +217 0F, surviving a 40 g's design load, surviving the following vibration requirements: Table 1: X-38 Wall Mounted Random Vibration Environment (<10 Lbs) Normal Axis In-Plane Axes Frequency (Hz) Magnitude (g2/Hz) Frequency (Hz) Magnitude (g2/Hz) 20 0.015 20 0.015 100 0.500 90 0.300 1000 0.500 350 0.300 2000 0.030 2000 0.020 Grms = 24.690 Grms = 14.294 Notes : Duration is 30 seconds per axis and operating in the following thermal/vacuum cycling conditions: The antenna shall be tested 3 cycles per Figure 2, with maximum and minimum levels +/- margin shown in the left margin. The rate of temperature shall not exceed 4.00 F per minute, nor be less than 1.00 F per minute .Corona breakdown measurement shall be performed at full specified handling power during one of the pressure transition periods. Note: A = Time to stabilize antenna temperature plus 1-hour minimum B = VSWR measurement to be performed C = VSWR monitoring during temperature transition. Figure 2: Thermal Cycles and Thermal Vacuum Cycles for Qualification Testing . This procurement is being conducted under the Simplified Acquisition Procedures (SAP). The Government intends to acquire a commercial item using FAR PART 12. The SIC Code and Size Standard are 3769 and 1000, respectively. The DPAS Rating for this procurment is DO C9. The anticipated release date of RFQ 9-BH13-44-9-23P is on or about June 21, 1999 with an anticipated quote due date of on or about July 30, 1999. All qualified responsible sources may submit a quote which shall be considered by the agency. An ombudsman has been appointed -- See Internet Note "B". The solicitation and any documents related to this procurement will be available over the Internet. These documents will be in Microsoft Office Suite (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and will reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The Internet site, or URL, for the NASA/JSC Business Opportunities home page is http://procurement.nasa.gov/EPS/JSC/class.html It is the offeror's responsibility to monitor the Internet site for the release of the solicitation and amendments (if any). Potential quoters will be responsible for downloading their own copy of the solicitation and amendments (if any). Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html Posted 06/02/99 (D-SN338210). (0153)

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