Commercial Acquisition Department, Bldg 11, Naval Undersea Warfare Center Division, Newport, Code 59, Simonpietri Dr., Newport, RI 02841-1708

58 -- MULTI CHANNEL ACOUSTIC ANALYSIS SYSTEMS SOL N66604-00-Q-3621 DUE 041200 POC E. Alexander, Contracting Officer at (401) 832-3230; FAX (401) 832-4820 WEB: Naval Undersea Warfare Center Division, Newport, http://www.npt.nuwc.navy.mil/contract/. E-MAIL: Elizabeth Alexander, Contracting Officer, alexanderea@npt.nuwc.navy.mil. The solicitation is amended to include the following questions/clarifications to the specifications: Q. 1. There is statement "The analog data will be received through (favorable) Front Panel Data Port .". Should this not read "The digital data will be ."? A. 1. The data input will be differential analog (not the standard FPD). There will be 96 input pins using a military connector to be determined. Q. 2. The specs call for 8 channel systems scaleable to 32 channel systems. There are two ways this can be done. Which do you require? A. 2. The initial system is to be delivered with 8 channels. Upgrade to 32 channels is required. The upgrade should not span more than 2 VME slots. Q 3. Is the demodulation/down conversion/tuning of the signals required to be real or complex or both? A3. Complex Q. 4. The use of 100BaseT Ethernet to output time series data puts a restriction on the maximum data rate and hence bandwidth that can be handled by the system. a) What is the actual desired bandwidth per channel? 2k for 3 Bands 16 K for the fourth. b) Does the data have to be transferred continuously or is it a block mode type transfer? Block mode: Channel 1 Band 1 2K samples Band 2 2 K samples Band 3 16 K samples Band 4 2K samples Channel 2 Band 1 2K samples Band 2 2 K samples Band 3 16 K samples Band 4 2K samples Channel N Band 1 2K samples Band 2 2 K samples Band 3 16 K samples Band 4 2K samples c)What is the desired resolution of the output time series, e.g. 8-bit, 16-bit, 32 bits fixed point, 32-bit floating point? 32 Integer d)If the system is scaled up to 32 channels will more Ethernet ports be added or will the bandwidth per channel be reduced? No. Q. 5 There are some specs about interpolation filter lengths, interpolation resolution etc. What does the term interpolation apply to in this context? Is it the down-conversion cos(wt) multiplying vector? Or is system supposed to be used for something other than just tuning in around an IF ( e.g Beam forming where an interpolating filter would be used)? A.5 Downconversion Q. 6 Is there a preferred choice of algorithm to be used for computing filter coefficients( e.g Parks Mcllelan, Remez etc) or will any optimal filter that meets the specs be acceptable? A.6. Non-specific. Must meet specs Q. 7 What is the preferred mode of control of the MCAA? If a VxWorks based system is bid then the most obvious choices are over Ethernet or a serial terminal. If a Solaris based system is bid it can over the aforementioned or over a directly attached monitor/keyboard-mouse combination. A.7. The system must run a real time OS (VxWorks). The controller will boot up from flash. There will be no hard drive. The system can be considered embedded. The closing date remains unchanged. Posted 04/07/00 (W-SN442485). (0098)

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