Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wasatch!cs.utexas.edu!ut-emx!frank From: frank@ut-emx.UUCP (Frank Abernathy) Newsgroups: sci.space Subject: Re: GEOS-6 dies. Summary: ..they emit RF..? Message-ID: <10389@ut-emx.UUCP> Date: 10 Feb 89 14:04:42 GMT References: <14215@cup.portal.com> <5352@whuts.ATT.COM> Organization: The University of Texas at Austin, Austin, Texas Lines: 11 In article <5352@whuts.ATT.COM>, sw@whuts.ATT.COM (WARMINK) writes: > In article <1989Feb9.013228.965@utzoo.uucp>, henry@utzoo.uucp (Henry Spencer) writes: > > As I recall, it's part of a sensor that encodes the position of rotating > > parts in the satellite's scanner system. Those bulbs are a notorious > > reliability problem that is being designed out of more recent satellites; > > There must be a good reason why LEDs weren't used - 6 years plus isn't that > long ago...anybody know why not? > My understanding is they emit RF in the GHZ range. That's also why they aren't usually employed in ECM equipment. (But, as usual, I'm probably wrong. :^) )