Naval Research Laboratory, Attn: Code 3230, 4555 Overlook Avenue, SW, Washington, DC 20375-5326

66 -- HIGH RESOLUTION MULTI-BAND SAR UPGRADE SOL N00014-97-R-SK13 POC Susan Kelly, Contract Sprecialist, Code 3230.SK (202) 767-6815, Contracting Officer, Helen Paul, CODE 3230.HB, (202) 767-6815 E-MAIL: (CLICK HERE TO FORWARD A REQUEST VIA E-MAIL, SYNOPSIS @ CONTRACTS.NRL.NAVY.MIL. This notice is a modification to the synopsis to amend the solicitation published in the CBD on 29 May 97. Questions received and answers to these questions are shown below. 1. QUESTION: What is the electrical power budget available for the 0.8 -- 2.0 GHz RF Module (115 VAC, 3 Phase, 400Hz or 28 VDC for example)? What's important to us is to know how many total watts (or amperes) are available to supply the amplifier-modulator, and the receiver packages. ANSWER: The transmitter section should be designed to draw at most 7 amperes at 120 VAC. 2. QUESTION: What is the actual RF frequency band you require (0.2 -- 2.0 GHz or 0.8 -- 2.0 GHz)? Paragraph II, for example, is titled "0.2 -- 2.0 GHz RF Module" but the transmitter, antenna, and receiver specifications seem to indicate your minimum frequency is 0.8 GHz. Clarifying this helps me better select the traveling wave tube device I'd propose for the RF amplifier. ANSWER: The transmitter section should cover at least the 1-2 GHz band, while thereceiver shall cover a broader range, 0.2-2 GHz, in order to facilitate possible expansion in the future. 3. QUESTION: Do you already have a data collection and display system for the actual SAR imagery being processed by the receiver module? Our receiver module outputs two channels of filtered intermediate frequency (IF) representing the raw SAR imagery. Normally this data would be processed and displayed, or stored for post mission processing. ANSWER: Data acquisition and display systems for the SAR should not be included in the proposal. 4. QUESTION: Does the existing SAR equipment provide the Modulator Control Signal (TTL) or are we free to propose a self-contained, programmable pulse modulator (AM, FM, PM etc.)? ANSWER: A programmable pulse modulator should be included in the proposal. 5. QUESTION: Does the receiver noise figure (better than or equal to 3 dB) represent the contribution of just the receiver to overall system noise figure? Free translation: 3 dB NF isn't very much. ANSWER: The noise figure specified in the original RFP is the receiver noise figure. 6. QUESTION: What are the desired beamwidths for both the azimuth and elevation axis? ANSWER: The beamwidth specified in the original RFP (23 degrees-34 degrees) applies to the azimuthal plane. As a result of the answers to questions, the Specification is changed as follows: The Transmitter section is changed to add -- "12) Power Requirements: at most 7 apmeres at 120 VAC." The Antenna section # 3) is changed to read -- "3) Azimuthal Beamwidth: 23-24 degrees;". No further questions will be addressed. The closing date is changed to 4:00 P.M. E.S.T. on 26 Jun 97. All other terms and conditions remain unchanged. For information regarding this solicitation contact Susan Kelly, Contract Specialist at (202) 767-6815..**** (0171)

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