MODIFICATION
66 -- Vector Network Analyzers
- Notice Date
- 9/8/2015
- Notice Type
- Modification/Amendment
- NAICS
- 334515
— Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals
- Contracting Office
- Department of the Navy, Naval Air Systems Command, Naval Air Warfare Center Aircraft Division Lakehurst, Contracts Department, Hwy. 547 Attn:B562-3C, Lakehurst, New Jersey, 08733-5083
- ZIP Code
- 08733-5083
- Solicitation Number
- N68335-15-R-0155
- Archive Date
- 8/8/2015
- Point of Contact
- Michael Miller, Phone: 732-323-7661
- E-Mail Address
-
michael.t.miller7@navy.mil
(michael.t.miller7@navy.mil)
- Small Business Set-Aside
- N/A
- Description
- The Naval Air Warfare Center Aircraft Division Lakehurst, NJ intends to competitively award a fixed price Indefinite Delivery Indefinite Quantity (IDIQ) contract for a maximum quantity of one hundred ninety-two (192) commercially available Vector Network Analyzers (VNA) and a maximum quantity of two hundred thirty-one (231) VNA Calibration Kits over a five (5) year period. This equipment is intended for use by Navy personnel in shipboard and shore-based laboratories and by other DOD personnel in secondary calibration laboratories, to calibrate passive microwave devices such as attenuators, couplers, isolators, terminations, and filters. The successful offeror shall manufacture and deliver VNAs and VNA Calibration Kits in accordance with the CALSTDs Specification CSS-15-352-030 (October 2014). The Contractor shall provide Operator/Maintenance manuals with each VNA unit. In addition, throughout the life of the IDIQ contract, the contractor shall have a calibration facility traceable to the National Institute of Standards and Technology and have a current Accredited Certificate/ Report of Calibration by an organization accredited to ISO 17025 with headquarters in the United States of America for the calibration of the VNA system furnished to the government under this procurement. Award of the IDIQ contract resulting from this solicitation will be made to the responsible offeror whose proposal is technically acceptable with acceptable past performance, whose price is the lowest offered. The evaluation factors for this acquisition are 1) Technical 2) Past Performance and 3) Price. Offerors must submit the Technical, Past Performance and Price Proposals in separate volumes. Large businesses are required to submit a Small Business Subcontracting Plan conforming to the requirements of FAR 19.7 and DFARS 219.7. The Government received the following E-mail question regarding the subject solicitation. (1) Paragraph 3.16.4.1 may need some modification or clarification. It now reads: 3.16.4.1 Transmission Magnitude Measurement Accuracy. When S11 = S22 = 0 for the DUT, the transmission magnitude measurement accuracy shall be within ±0.005 dB per dB except that it shall be within ±0.05 dB for the first 10 dB. For example, it shall be within ±0.175 dB for 35 dB insertion loss, and within ±0.05 dB for 3 dB insertion loss. The existing specification of an error of less than ±0.05 dB for losses of up to 10 dB is fine. The predominant error at these levels is the interaction between the test system load match and source match terms. For example, if a VNA has a source match term of 30 dB Return Loss and a load match term of 30 dB Return Loss then the interaction of those two reflections for a DUT with 0 dB insertion loss produces an error that's 60 dB below the measured signal. This calculates to an error of less than ±0.01 dB from these terms. Add that to a typical transmission tracking error term of ±0.01 dB and the resulting error is about ±0.02 dB. There are other error terms such as connector repeatability, test port cable magnitude and phase stability, and environmental temperature changes that can also affect the measurement accuracy. However, this spec may need to be modified for higher loss measurements to take into consideration the system noise floor. As the measured signal approaches the noise floor of a system the error contribution of that noise becomes more dominant. Paragraph 3.16.2 states that the minimum dynamic range of the system should be 0 to 60 dB. If a device with 60 dB insertion loss is measured on a system with 60 dB dynamic range the actual loss measurement will be indistinguishable from the noise floor and the error is essentially infinite. However, the spec as written would show an allowable error of ±0.3 dB (60 dB X 0.005). The same device measured in a system with 80 dB dynamic range would have an error of about ±1 dB (noise floor 20 dB below the measurement). 100 dB dynamic range would yield an error on the same DUT of less than ±0.1 dB (noise 40 dB below measurement). Therefore I suggest that to simplify the spec you might want to modify it to show the error limits when measuring a specific device. For example, a device with 35 dB loss measured on a system with 60 dB Return Loss with have an error of about ±0.5 dB. To achieve the error limits in the existing spec (±0.175 dB for 35 dB loss)the dynamic range spec would have to be changed from 60 to 70 dB. The error limits from noise would then be ±0.15 dB. The Government's response to this question is as follows: The question on paragraph 3.16.4.1 is directly related to the definition "dynamic range" in paragraph 3.16.2. For the context of the CSS, the dynamic range simply refers to the measurement range of the VNA system. In other words, we want a VNA system to measure up to 60 dB insertion loss (e.g. 60 dB attenuator) with the specified accuracy. There will be no change in paragraph 3.16.4.1. IMPORTANT INFORMATION: Registration in the Department of Defense DoD System for Award Management (SAM) database will be a prerequisite for receiving an award. For more information on the SAM, refer to the SAM website at https://www.sam.gov/portal/public/SAM.
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-
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- Record
- SN03875658-W 20150910/150908235600-ed95ea4f7125c3541d1485486795ada4 (fbodaily.com)
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