From owner-freebsd-hardware Wed Jun 21 20:17:40 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from virtualtrends.com (virtualtrends.com [192.41.12.162]) by hub.freebsd.org (Postfix) with ESMTP id 7DDE737B882 for ; Wed, 21 Jun 2000 20:17:29 -0700 (PDT) (envelope-from humanhunter@connectstar.net) Received: from skyline (05-053.024.popsite.net [216.126.161.53]) by virtualtrends.com (8.8.5) id VAA15213; Wed, 21 Jun 2000 21:17:29 -0600 (MDT) X-Authentication-Warning: virtualtrends.com: Host 05-053.024.popsite.net [216.126.161.53] claimed to be skyline Message-ID: <003001bfdc11$736c5ee0$3700a8c0@skyline> From: "Blake" To: References: Subject: Re: Hardware in space? Date: Wed, 21 Jun 2000 23:16:48 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01BFDBD6.C600F8E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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" To: 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
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 =
----- Original Message -----
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=20 information!  Thanks everyone!
>
> I've got a bunch of = information, and a handful of people to respond to...
> so stand = by, those=20 of you who know who you are.  Anyway, a couple of
> = clarifications=20 since I stirred up so much interest:
>
> - This is only the = proposal stage of the instrument.  The way NASA works
> is = every year=20 they make "Announcements of Opportunity", which is a thingy
> that = invites=20 us to write proposals to do work.  There are lots of = various
>=20 categories of this, from data analysis of Solar Flares to = theoretical
>=20 consideration of pulsar evolution to proposing new instruments for = the
>=20 Next Generation Space Telescope.  If we win, we'd start working on=20 this
> sometime next year, probably, with a launch slated for = about 3=20 years after
> that. 
>
> - The sounding rocket=20 environment isn't quite as bad as it sounds.  The
> computer = will be=20 grounded to the chassis, but this doesn't mean it's going
> to get = real=20 cold.  We've only got 5 minutes above the atmosphere, and I
> = think=20 it'd take a fair bit longer than that to get cold enough to = matter.
>=20 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=20 a
> senior thesis project for a student.  (I don't think = they've=20 gotten it
> down to a year yet, though.)  Basically they're = working=20 on the level of
> re-inventing Sputnik.  Amazing stuff, = amazingly=20 simple, teaches people a
> bunch.  Way below the level of=20 sophistication I have to aim for,
> unfortunately.  I'm told = some of=20 their electronics parts come from Radio
> Shack!  :-)
> =
> -- While getting too cold probably isn't an issue, COOLING = certainly=20 is.
> As a few people have alluded to, cooling in space becomes an = issue=20 because
> there's no air.  This will be a problem much = earlier,=20 because we'll
> evacuate the payload several hours before = launch.  If=20 there's a delay, the
> package could wind up sitting on the launch = rail=20 for a few days under
> vacuum. I've worried about blowing the top = off the=20 CPU from the heat.  I
> imagine it'll probably have to be = heat-sunk=20 to the chassis in some manner.
> Someone mentioned using a 486; = that's not=20 such a bad idea.  Mostly I'm
> just grabbing data from the = RS-232=20 ports and stuffing it to disk, so I'll
> probably wind up doing = some=20 experimentation to see just what I'll need.
>
>
>=20 Thanks,
>
> Brian
> [Reporting in from Japan]
> =
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with=20 "unsubscribe freebsd-hardware" in the body of the message
>=20 ------=_NextPart_000_002B_01BFDBD6.C600F8E0-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message