NASA/Goddard Space Flight Center, Code 215, Greenbelt, MD 20771

66 -- PURCHASE OF DUAL-POLARIZATION 91 GHZ RADIOMETER SOL 554-72343-920 DUE 041200 POC Mary E. McKaig, Contract Specialist for Simplified Acquisition, Phone (301) 286-4240, Fax (301) 286-1720, Email Mary.E.McKaig.1@gsfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=D&pin=51#554-72343-920. E-MAIL: Mary E. McKaig, Mary.E.McKaig.1@gsfc.nasa.gov. This is a modification to the synopsis entitled PURCHASE OF DUAL-POLARIZATION 91 GHZ RADIOMETER which was posted on March 21, 2000. You are notified that the following changes are made: This modification is issued to include the specifications in the body of the synopsis in addition to uploading them as a Microsoft Word document. The specifications for the dual-polarization 91 GHz radiometer are as follows: Specifications: 1) Antenna: (Quantity 1) a) Type: Dual-polarization (linear) feed-horn with integrated lens. The feed-horn will be corrugated. b) The lens will be plano-convex with 1/4 wave matching groves on the planar side. The lens should be attached to the corrugated horn using a metal propagation section, thus creating one integral lens feed-horn unit. c) The OMT will have standard waveguide butt-flange interfaces. d) Minimum frequency range: 90.955-92.355 GHz. e) Beam width: 4.0% +/- 0.1%. f) Beam efficiency: >92% (optimize design for maximum). g) Maximum flange diameter: Sufficient to meetbeam width and efficiency spec with 3/8-inch radius added for mounting by lens face. h) VSWR over passband: Sufficient to meet NF specification. i) Insertion loss over passband: Sufficient to meet NF specification. j) maximum cross-pol off-axis lobe over passband: 25 DB 2) Isolators: (Quantity 2) a) Placed between OMT and mixers. b) Isolation: 20 DB c) Insertion loss: Sufficient to meet NF specification (~1 DB) 3) Mixers: (Quantity 2) a) Fundamental mixer using planar diodes (no whisker diodes). b) Lo: 91.655 GHz with better than 5 mhz/deg c temperature stability 4) IF amplifier: (Quantity 2) a) NF: Sufficient to meet NF specification. b) Gain: Sufficient to produce -20dbm at IF output. 5) IF filter: (Quantity 2) a) Passband: 500-1500 MHz, 30 DB rejection at 0.6 BW away, 40 DB passband ripple: <0.75 db. b) Rejection >30 DB at 0.6 BW away from band edge, >40 DB at 2 BW away from band edge. c) IF outputs: SMA female d) Power supply: +15 v 6) Integration of all components in an envelope of approximately 80 cubic inches or less with the overall length not to exceed 5 inches. 7) Delivery: 90-120 days after receipt of order (ARO). The due date for receipt of quotes IS NOT extended. Documents related to this procurement are available over the Internet and are 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/GSFC Business Opportunities home page is http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=CL&pin=51 Offerors are responsible for monitoring this site for the release of the solicitation and any amendments. Potential offerors are responsible for downloading their own copy of the solicitation and amendments (if any). Posted 03/22/00 (D-SN436960). (0082)

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