DOC; Mountain Administrative Support Center; Acquisition Management Division; 325 Broadway MC3; Boulder, CO

66 -- PASSIVE INTERMODULATION MEASUREMENT SYSTEM SOL NB813000803326MB POC Michelle Bernal, Purchasing Agent, (303) 497-3983 or FAX (303) 497-3163 E-MAIL: NOAA; MASC Acquisition Management, Michelle.B.Bernal@noaa.gov. The National Institute of Standards & Technology (NIST) requires a passive intermodulation (PIM) measurement system that operates in the PCS wireless communication band. The system shall provide two frequency tones in the downlink band (1930-1990 MHZ) and measure the power of the intermodulation products in the uplink band (1850-1910 MHZ). The system must be capable of both forward and reverse PIM measurements (2 port minimum). One port must provide two CW carrier signals, each with independent user- adjustable frequency and power levels that can be swept in both directions. This port must also receive and detect PIM signals generated by the device under test in the reverse direction in the presence of reflected downlink power (10 dB maximum return loss). The other port must receive and detect the forward propagating PIM signals in the presence of the transmitted signals. Both ports must have DIN 7-16 female connectors, and have a nominal impedance of 50 ohms with no more than 20 dB of return loss.The system must be fully integrated and automated to measure the power of the third-order intermodulation products during frequency, power, and time sweeps. The system must be capable of time swept measurements for intervals between 0 and 30 sec with at least 200 ms intervals. The measurement interval for frequency swept measurements must be no longer than 2 sec (with maximum averaging). In addition, the power of all intermodulation products that fall within the uplink band must be recorded for non-swept measurements. The system must hold calibration for at least one year (for the limits specified below) or it must come with the capability and equipment to be calibrated by the user in the laboratory. Warm-up time must not exceed one hour to achieve specified accuracy. Data measured by the system must be retrievable for external storage compatible with MacOS or Windows95. Environmental Specifications: The system must operate at relative humidities ranging from 10-90 percent non-condensing, ambient temperatures between 16-38 degrees Celsius, and altitudes up to 2000 meters. Power Requirements: The system must operate at no more than 1500 Volt- Amps at 110 VAC, 60 Hz. An appropriate AC power cable must be supplied. Dimensions: The system must be mountable in a 19" (48.26 cm) wide equipment rack, and have a height of no more than 60" (152.4 cm) and a depth of no more than 24" (60.96 cm). Rack mount hardware must be provided. Accessories Supplied: The system must come with two DIN 7-16 Male-to-Female connector savers, 2 operating and maintenance manuals, and a passive, low- IM (-120 dBm) termination with a DIN 7-16 connector and a gender reversing adaptor. Uplink Specifications: The receiver must have a noise floor of -140 dBm for 0 dB signal-to-noise ratio, a maximum operational PIM input power of at least -70 dBm (dynamic range of 70 dB), and a maximum survival input power of plus 16 dBm. PIM power measurements must be precise to plus or minus 0.5 dB from -80 dBm to -120 dBm, and have a residual intermodulation of no more than -120 dBm in the presence of two plus 43 dBm (20 watt) uplink tones. Downlink Specifications: The transmitter must have a frequency increment of 200 kHz or less, and a frequency accuracy no worse than plus or minus 10 ppm. The transmit power per carrier must cover the range from plus 20 dBm to plus 43 dBm with increments of 0.5 dB. The output power accuracy must be plus or minus 0.25 dB over frequency, temperature (18-32 degrees Celsius), carrier power level, and time (at least 2 hours after warm-up). The transmitter must have a reverse power protection of at least plus 46 dBm (40 watts). There is no formal RFQ. Interested sources may submit a bid by fax or mail but it must be received on or before May 12, 1998. Vendors must also submit five references from previous customers who have purchased a system(s) with the above features and specifications. Vendor must also provide an on-site demonstration of the system. Technical merit as well as price will be used to evaluate offers. As the technical merit becomes more equal, price becomes a greater factor. Procurements under Simplified Acquisition Procedures ($100,000 or less) are set-aside for small business unless small business cannot meet the need at a reasonable price. Terms and Conditions and agency level protest procedures can be found on web site http: netsite.esa.doc.gov/oam/conops/#REFERENCE. Hard copy in full text available from office address and phone number listed in notice. (0113)

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