Kennedy Space Center, FL 32899

61 -- 120 VDC POWER SOURCE DUE 041796 POC Gary Moffett, 407-867-5722. This is not an IFB nor RFP. No solicitation exists and requests for a copy of a solicitation package will not be considered. McDonnell Douglas Space & Defense Systems-KSC (MDS&DS) is seeking to identify potential sources which can provide a, 120VDC, 30 AMP, power source. The requirement is to provide ground power to International Space Station components prior to launch and after landing. Responsible Sources of commercial off the shelf or modified commercial off the shelf power supplies must meet the following QUALIFICATION REQUIREMENTS: (The voltage output at the load is required to be in an envelope of 114.5-127.5 volts dc with a nominal operating voltage of 121 volts dc. The units require an IEEE 488 interface with the capability of handling at a minimum the following commands and measurements, power on-off, voltage adjust, current limiting, and monitoring of voltage and current. The units also require a remote sense circuit capable of sensing the output voltage at the load point located 475 feet from the source. The cabling network has the following characteristics, a cable resistance of .6 ohms, a cable capacitance of .05 microfarads, and a cable inductance of 52 microhenrys. The unit will supply power to a dynamic load, thus the source is required to have a transient voltage range of 97.5-144.6 volts, and a transient recovery time of .85ms or less for a 1.5 kw load change within the full load rating. The maximum allowable ripple voltage is 3 volts peak to peak. The required source impedance for frequencies of 100 Hz and below is .12 ohms or less. For a frequency of 10 KHz the source impedance is 1 ohm or less. There is a requirement to package 2 supplies in a rack and to have a switching circuit between the supplies to provide redundant power (a total of 4-6 racks required).) In the event an RFP is issued the total quantity of power supplies will be 8 to 12 . The required delivery date for the first unit is seven to nine months ARO. The remainder of the units may have a phased delivery over a one year time frame. (0086)

Loren Data Corp. http://www.ld.com (SYN# 0268 19960327\61-0004.SOL)