As a result of the questions below, the subject RFQ has been slightly amended, and the response due date also extended to 04/18/2013, to give the interested vendors an opportunity to participate in this requirement. Please, see attached RFQ for amendment in RED. For any venddor who has already submitted a quote, if the changes do not affect your quote, please ignore this amendment.

QUESTIONS: Concerns have been addressed in RFQ attached.

1. We are wondering why you are seeking competitive bids, wasting time and taxpayer dollars if you plan a sole source procurement which is usually justified by the user and purchasing by such statements as "must it be100% compatible with an existing system". Is the requested system is to be a complete, standalone system (i.e. will the new system require cannibalization of the existing system to function?)? If the new system is complete, but must also be100% compatible with the existing system, Dantec Dynamics will decline to submit an irrelevant (guaranteed to lose) response. NOTE: RAR comment: I have modified the compatability requirement (in red) from mandatory to useful to the FDA, as this is not a JOFOC or sole source procurement but competitive. Compatability with FDA's current LaVision system would be an added incentive for acceptance of a bid.

2. There are no performance details in the RFQ regarding the requirements of the measurement application(s). In particular, there is no indication of the size of the measurement area and/or what light sheet optics (angle) is required. NOTE: RAR comment: specifications for field of view (FOV) and laser sheet angle have been added to the camera specifications (in red).

3. Why are 16 output and 3 input channels required in the "high speed controller"? If 4 (or 8) output channels are more than sufficient to sync and control the lasers and cameras, what would the additional 12 (or 8) output channels be used for? Also, unless you are doing hypersonic velocity measurements, with sub microsecond delta T, a 20 to 50 ns resolution will be more than adequate for high accuracy. NOTE: RAR comment: These specifications are needed for possible future hypersonic TRPIV measurements at the White Oak Air Force wind tunnel complex. This justification has been added to the specifications for then high speed controller section of the RFQ in red.