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

16 -- X-38 GPS RF FRONT-END EQUIPMENT SOL 9-BE13-27-8-28Q DUE 103098 POC Wendy L. Boudreaux, Contract Specialist, Phone (281) 483-5338, Fax (281) 244-5331, Email wendy.l.boudreaux1@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-BE13-27-8-28Q. E-MAIL: Wendy L. Boudreaux, wendy.l.boudreaux1@jsc.nasa.gov. NASA/JSC is hereby soliciting information for potential sources for commercial off-the-shelf space-qualified or space qualifiable Global Positioning System (GPS)radio frequency (RF) front-end equipment to be integrated into the X-38 spacecraft, 201 vehicle. NASA/JSC plans to issue a Request for Quote for commercial equipment to be delivered 3 months after receipt of order. There will be multiple awards of firm fixed price contracts. The X-38 GPS RF front end interfaces with the Space Integrated GPS Internal Navigation Systems (INS) (SIGIs) on the spacecraft that are used as the primary source of navigation and will include attitude determination. The RF front end equipment must be of high reliability and capable of operating in the environments encountered while on-orbit, and re-entry conditions (i.e. temperature, vibration, shock, pressure, radiation, atomic oxygen, ultraviolet, RFI/EMI/EMC). This equipment must also endure the non-operating Shuttle enviroments of pre-launch, and launch. The manufacturer must have space flight heritage. The RF front-end includes the following equipment; 17 GPS antennas, 17 filters/preamplifiers, 9 RF switches, 9 4-way power dividers, and corresponding RF coaxial cables/commectors. The antennas will be mounted on composite skin, under Thermal Protection System (TPS) of the X-38 V-201 vehicle. The preamplifier and filter assembly will be mounted outside the crew cabin (unpressurized environment). The switches and power dividers will be mounted inside the crew cabin next to the 3 SIGIs. Key salient features shall include low profile, small diameter broad beam antennas, stable absolute and relative phase relationship over temperature range, 60 dB gain amplification, low noise figure, out of band rejection of 75 dB, high isolation, low VSWR, low insertion loss and low-loss flexible cable. Center frequency is 1575 MHz (l1 only). Environmental requirements include: Unit Operating Temperature Antennas: -87 deg F to +212 deg F Preamp/filter Assembly and Cables: -87 deg F to +171 deg F Switches and Power Divider: +22 deg F to +100 deg F 40 g's design load limit No solicitation exists; therefore, do not request a copy of the solicitation. When a solicitation is released, it will be available on the NASA Acquisition Internet Service (NAIS). It is the potential offerors responsibility to monitor that site for the release of any solicitation, the URL for the NAIS is http://nais.msfc.nasa.gov/EPS/JSC/date.html. All qualified responsible sources may submit a response which shall be considered by the agency. All responses shall be submitted to Wendy Boudreaux/BE13 at 2101 NASA Rd. 1, Houston, TX 77058 or by fax (281) 244-5331 or via E-mail at wboudrea@ems.jsc.nasa.gov no later than October 30, 1998. Posted 10/20/98 (D-SN263734). (0293)

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