NASA/Goddard Space Flight Center, Code 214.4, Greenbelt, MD 20771

A -- ULTRA-STABLE OSCILLATORS FOR THE GRACE MISSION DUE 062399 POC James Debelius, Contract Specialist, Phone (301)286-0055, Fax (301)286-0341, Email James.M.Debelius.1@gsfc.nasa.gov -- Thomas Russell, Contracting Officer, Phone (301)286-2885, Fax (301)286-0341, Email Thomas.S.Russell.1@gsfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/GSFC/date.html#214.4-04744. E-MAIL: James Debelius, James.M.Debelius.1@gsfc.nasa.gov. This is a notice to award a contract on a sole source basis to The Johns Hopkins University/Applied Physics Laboratory (JHU/APL) for Ultra-Stable Oscillators (USOs) in support of the Gravity Recovery and Climate Experiment (GRACE) mission. The GRACE mission is part of NASA's Earth System Science Pathfinder (ESSP) program. JHU/APL will be providing USOs whose primary function is to generate very clean, highly stable frequency reference signals for the Ka-band transmitters in the microwave ranging system leading to unprecedented accuracy. The resulting Ka-band signals must be sufficiently stable to allow ranging measurements with precision to a few micrometers. A secondary USO function is to provide precise clocking signals for the GPS receivers. The USOs need to be delivered in mid-December 1999 and mid-February 2000. JHU/APL has conducted the formulation subprocess (Phase B) effort for the GRACE USOs. During the Formulation Subprocess of the GRACE Mission, JHU/APL developed the design for the GRACE USOs based on heritage from oscillators provided to the Mars Global Surveyor and Cassini missions (among others). Other formulation activities included thermal and radiation analyses; breadboard verification of design; procurement of resonators and other long-lead parts; initiation of screening to select resonators of sufficient stability; and detailed design of several modules. Based on the foregoing, JHU/APL is considered the only source capable of fulfilling the Government's requirements and meeting the delivery schedule constraints. The statutory authority permitting other than full and open competition of this procurement is 10 U.S.C. 2304(c)(1), Only One Responsible Source. Interested firms desiring consideration have 15 days from publication in the Commerce Business Daily (CBD) to submit their qualifications/capabilities. Such qualifications/capabilities will be used solely for the purpose of determining whether or not to conduct this procurement on a competitive basis. Responses received after 15 days without the required information will be considered nonresponsive to the synopsis and will not be considered. A determination by the Government not to compete this proposed contract on a full and open competition basis based upon responses to this notice is solely within the discretion of the Government. All responsible sources may submit a proposal which shall be considered by the agency. An Ombudsman has been appointed, See Internet Note "B". See Note 22. Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html Posted 06/07/99 (D-SN339819). (0158)

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