Date: Wed, 21 Jun 2000 23:16:48 -0700 From: "Blake" <humanhunter@connectstar.net> To: <freebsd-hardware@FreeBSD.ORG> Subject: Re: Hardware in space? Message-ID: <003001bfdc11$736c5ee0$3700a8c0@skyline> References: <Pine.OSF.4.05.10006220859440.4383-100000@isass0.solar.isas.ac.jp>
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This is a multi-part message in MIME format. ------=_NextPart_000_002B_01BFDBD6.C600F8E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable try getting a faster CPU and underclocking it.. say a P200 running at = 66mghz or something.. get a 100 bus speed mghtz cpu an run it at 66 mghz = or 33... that will make cooling MUCH easier=20 ----- Original Message -----=20 From: "Brian Handy" <handy@isass0.solar.isas.ac.jp> To: <freebsd-hardware@FreeBSD.ORG> Sent: Wednesday, June 21, 2000 5:17 PM Subject: Re: Hardware in space? > Wow! What a great dose of information! Thanks everyone! >=20 > I've got a bunch of information, and a handful of people to respond = to... > so stand by, those of you who know who you are. Anyway, a couple of > clarifications since I stirred up so much interest: >=20 > - This is only the proposal stage of the instrument. The way NASA = works > is every year they make "Announcements of Opportunity", which is a = thingy > that invites us to write proposals to do work. There are lots of = various > categories of this, from data analysis of Solar Flares to theoretical > consideration of pulsar evolution to proposing new instruments for the > Next Generation Space Telescope. If we win, we'd start working on = this > sometime next year, probably, with a launch slated for about 3 years = after > that. =20 >=20 > - The sounding rocket environment isn't quite as bad as it sounds. = The > computer will be grounded to the chassis, but this doesn't mean it's = going > to get real cold. We've only got 5 minutes above the atmosphere, and = I > think it'd take a fair bit longer than that to get cold enough to = matter. > There's a group at Stanford that's taken this to an extreme: >=20 > http://aa.stanford.edu/~ssdl/ >=20 > These guys are trying to get to where they can turn a satellite into a > senior thesis project for a student. (I don't think they've gotten it > down to a year yet, though.) Basically they're working on the level = of > re-inventing Sputnik. Amazing stuff, amazingly simple, teaches people = a > bunch. Way below the level of sophistication I have to aim for, > unfortunately. I'm told some of their electronics parts come from = Radio > Shack! :-) >=20 > -- While getting too cold probably isn't an issue, COOLING certainly = is. > As a few people have alluded to, cooling in space becomes an issue = because > there's no air. This will be a problem much earlier, because we'll > evacuate the payload several hours before launch. If there's a delay, = the > package could wind up sitting on the launch rail for a few days under > vacuum. I've worried about blowing the top off the CPU from the heat. = I > imagine it'll probably have to be heat-sunk to the chassis in some = manner. > Someone mentioned using a 486; that's not such a bad idea. Mostly I'm > just grabbing data from the RS-232 ports and stuffing it to disk, so = I'll > probably wind up doing some experimentation to see just what I'll = need. >=20 >=20 > Thanks, >=20 > Brian > [Reporting in from Japan] >=20 >=20 >=20 > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message >=20 ------=_NextPart_000_002B_01BFDBD6.C600F8E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.3017.2400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>try getting a faster CPU and = underclocking it.. say=20 a P200 running at 66mghz or something.. get a 100 bus speed mghtz cpu an = run it=20 at 66 mghz or 33... that will make cooling MUCH easier = </FONT></DIV> <DIV><FONT face=3DArial size=3D2>----- Original Message ----- </FONT> <DIV><FONT face=3DArial size=3D2>From: "Brian Handy" <</FONT><A=20 href=3D"mailto:handy@isass0.solar.isas.ac.jp"><FONT face=3DArial=20 size=3D2>handy@isass0.solar.isas.ac.jp</FONT></A><FONT face=3DArial=20 size=3D2>></FONT></DIV> <DIV><FONT face=3DArial size=3D2>To: <</FONT><A=20 href=3D"mailto:freebsd-hardware@FreeBSD.ORG"><FONT face=3DArial=20 size=3D2>freebsd-hardware@FreeBSD.ORG</FONT></A><FONT face=3DArial=20 size=3D2>></FONT></DIV> <DIV><FONT face=3DArial size=3D2>Sent: Wednesday, June 21, 2000 5:17 = PM</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Subject: Re: Hardware in = space?</FONT></DIV></DIV> <DIV><BR></DIV><FONT face=3DArial size=3D2>> Wow! What a great = dose of=20 information! Thanks everyone!<BR>> <BR>> I've got a bunch of = information, and a handful of people to respond to...<BR>> so stand = by, those=20 of you who know who you are. Anyway, a couple of<BR>> = clarifications=20 since I stirred up so much interest:<BR>> <BR>> - This is only the = proposal stage of the instrument. The way NASA works<BR>> is = every year=20 they make "Announcements of Opportunity", which is a thingy<BR>> that = invites=20 us to write proposals to do work. There are lots of = various<BR>>=20 categories of this, from data analysis of Solar Flares to = theoretical<BR>>=20 consideration of pulsar evolution to proposing new instruments for = the<BR>>=20 Next Generation Space Telescope. If we win, we'd start working on=20 this<BR>> sometime next year, probably, with a launch slated for = about 3=20 years after<BR>> that. <BR>> <BR>> - The sounding rocket=20 environment isn't quite as bad as it sounds. The<BR>> computer = will be=20 grounded to the chassis, but this doesn't mean it's going<BR>> to get = real=20 cold. We've only got 5 minutes above the atmosphere, and I<BR>> = think=20 it'd take a fair bit longer than that to get cold enough to = matter.<BR>>=20 There's a group at Stanford that's taken this to an extreme:<BR>> = <BR>>=20 </FONT><A href=3D"http://aa.stanford.edu/~ssdl/"><FONT face=3DArial=20 size=3D2>http://aa.stanford.edu/~ssdl/</FONT></A><BR><FONT face=3DArial = size=3D2>>=20 <BR>> These guys are trying to get to where they can turn a satellite = into=20 a<BR>> senior thesis project for a student. (I don't think = they've=20 gotten it<BR>> down to a year yet, though.) Basically they're = working=20 on the level of<BR>> re-inventing Sputnik. Amazing stuff, = amazingly=20 simple, teaches people a<BR>> bunch. Way below the level of=20 sophistication I have to aim for,<BR>> unfortunately. I'm told = some of=20 their electronics parts come from Radio<BR>> Shack! :-)<BR>> = <BR>> -- While getting too cold probably isn't an issue, COOLING = certainly=20 is.<BR>> As a few people have alluded to, cooling in space becomes an = issue=20 because<BR>> there's no air. This will be a problem much = earlier,=20 because we'll<BR>> evacuate the payload several hours before = launch. If=20 there's a delay, the<BR>> package could wind up sitting on the launch = rail=20 for a few days under<BR>> vacuum. I've worried about blowing the top = off the=20 CPU from the heat. I<BR>> imagine it'll probably have to be = heat-sunk=20 to the chassis in some manner.<BR>> Someone mentioned using a 486; = that's not=20 such a bad idea. Mostly I'm<BR>> just grabbing data from the = RS-232=20 ports and stuffing it to disk, so I'll<BR>> probably wind up doing = some=20 experimentation to see just what I'll need.<BR>> <BR>> <BR>>=20 Thanks,<BR>> <BR>> Brian<BR>> [Reporting in from Japan]<BR>> = <BR>> <BR>> <BR>> To Unsubscribe: send mail to </FONT><A=20 href=3D"mailto:majordomo@FreeBSD.org"><FONT face=3DArial=20 size=3D2>majordomo@FreeBSD.org</FONT></A><BR><FONT face=3DArial = size=3D2>> with=20 "unsubscribe freebsd-hardware" in the body of the message<BR>>=20 </FONT></BODY></HTML> ------=_NextPart_000_002B_01BFDBD6.C600F8E0-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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