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Article #1951Re: space news from Oct 2 AW&ST
From: Mike Chin
Date: Tue, 28 Nov 1989 02:09
Date: Tue, 28 Nov 1989 02:09
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In article <1989Nov26.223357.27453@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes: >but will need regular fuel shipments from Earth. The 20kHz AC power >system is abandoned [good!] in favor of DC. [Curious -- why not use the >standard aircraft 400Hz AC? Because that would be an admission that the >ridiculous 20kHz stuff was a mistake?] The thermal control system is being Why is 20 kHz bad? I vaguely remember an article in Powertecnics describing this system, but I wasn't aware of any controversy. I was involved in a Explorer sat project where all voltages were derived from a 28V bus; designing the DC-DC converters was a major effort (luckily not done by me). Mike Chin Lawrence Berkeley Labs MJChin@lbl.gov
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!helios.ee.lbl.gov!ux1.lbl.gov!mikecReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!helios.ee.lbl.gov!ux1.lbl.gov!mikec From: mikec@ux1.lbl.gov (Mike Chin) Newsgroups: sci.space,sci.space.shuttle Subject: Re: space news from Oct 2 AW&ST Message-ID: <4300@helios.ee.lbl.gov> Date: 28 Nov 89 02:09:15 GMT References: <1989Nov26.223357.27453@utzoo.uucp> Sender: usenet@helios.ee.lbl.gov Reply-To: mikec@ux1.lbl.gov (Mike Chin) Organization: Lawrence Berkeley Laboratory, Berkeley Lines: 15