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COMMERCE BUSINESS DAILY ISSUE OF JULY 22,1997 PSA#1892Contracts Group, Bldg 588, Mail Stop 32, Naval Air Warfare Center
Aircraft Division, Patuxent River, MD 20670-5304 36 -- MODE STRIPPER SOL N0042197Q5642 DUE 081397 POC Francine Keys,
Purchasingin Agent (301) 342-8132 X22 The Patuxent River NAWC has a
requirement to procure a Mode-Stirrer and installation. Specification:
This specification establishes requirements for a vertically oriented
mode-stirrer with a drive and controller and its installation in an
existing 20" X 14' X 10" reflective chamber. The stirrer will be
modified from that specified in MIL-STD-1344 in order to provide
optimum distribution of the fields, horizontally and vertically. This
stirrer and chamber will be used by the electromagnetic interference
laboratory to perform radiated susceptibility, radiated emissions, and
shielding effectiveness testing of equipment. Modification of the mode
stirrer as specified in MIL-STD-1344. Stirrer shall be approximately
eight (8) feet by four (4) feet. The stirrer shall be modified from
that specified in MIL-STD-1344 in order to provide optimum distribution
of the fields, horizontally and vertically. The paddles can be
constructed of any lightweight, durable, highly reflective material.
The drive unit shall be mounted extrnally to the shielded enclosure,
and the drive mechanism fed through the enclosure wall via a shielded
flange/baering assembly. Shielding effectiveness of the shaft
penetration will be no less than 100 dB at 1GHz. The design of the
paddles will be such that the paddle assembly can be removed by two (2)
people in approximately 1/2 hour. The mode stirrer system will have a
designed speed range of 0.001 RPM to 10 RPM. It shall be position
settable to one degree increments with 0.1 degree resolution and
accuracy. Control of the Mode Stirrer shall be typically via user
supplied PC. Control to the Indexer (controller) shall be provided
through an IEEE 488.2 interface port. DRIVE UNIT: type: direct drive
brushless servo motor, power: 115 VAC single phase, Resolver feedback,
resolution: greater than 507,904 steps per revolution, accuracy: +/-30
arc-sec (0.0083 degrees), repeatability: +/-5 arc-sec (0.0139 degrees),
max stepping rate: 1,600,000 steps/sec, dynamic braking, configurable
position accuracy to reduce settling time, fully protected against open
and short circuits, INDEXER: 2 axes of step and direction control with
encoder feedback, 1.6 MHz step output frequency, operates stand-alone
or interface with PC's, one IEEE-488.2 interface port, SOFTWARE:
Microsoft windowns (tm) based application development software,
WARRANTY: Minimum 2 years unlimited on all system components,
DOCUMENTATION: operator manuals and circuit schematics shall be
provided with the system. Request for this RFQ shall FAXED to
Contracts, Attn: Francine Keys, NAWC, Patuxent River, MD 20670 (301)
342-1913 (0199) Loren Data Corp. http://www.ld.com (SYN# 0359 19970722\36-0005.SOL)
36 - Special Industry Machinery Index Page
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