From owner-freebsd-hardware Fri Jun 23 0:25:41 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from gscamnlh01.wr.usgs.gov (gscamnlh01.wr.usgs.gov [130.118.4.115]) by hub.freebsd.org (Postfix) with ESMTP id 9114637B895 for ; Fri, 23 Jun 2000 00:25:32 -0700 (PDT) (envelope-from rsowders@usgs.gov) To: "Blake" Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: Hardware in space? X-Mailer: Lotus Notes Release 5.0.2b December 16, 1999 Message-ID: From: rsowders@usgs.gov Date: Fri, 23 Jun 2000 00:25:19 -0700 X-MIMETrack: Serialize by Router on gscamnlh01/SERVER/USGS/DOI(Release 5.0.2b |December 16, 1999) at 06/23/2000 12:25:31 AM, Serialize complete at 06/23/2000 12:25:31 AM MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=_alternative 0028C9D488256907_=" Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org This is a multipart message in MIME format. --=_alternative 0028C9D488256907_= Content-Type: text/plain; charset="us-ascii" You could use a refrigeration chip. They are available locally here. They're the same size as the CPU and can cool pretty good. You could turn it off after launch or attach a thermostat. I use the thermostat. Send me your address in private email and I'll send you one. I'm right down the road from NASA/Ames. I quit using them in favor of closed loop cryogenic, but that would be way too heavy for your needs. "Blake" Sent by: owner-freebsd-hardware@FreeBSD.ORG 06/21/00 11:16 PM To: cc: Subject: Re: Hardware in space? 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 ----- Original Message ----- 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! > > 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: > > - 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. > > - 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: > > http://aa.stanford.edu/~ssdl/ > > These guys are trying to get to where they can turn a satellite into > 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! :-) > > -- 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. > > > Thanks, > > Brian > [Reporting in from Japan] > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > --=_alternative 0028C9D488256907_= Content-Type: text/html; charset="us-ascii"
You could use a refrigeration chip.  They are available locally here.  They're the same size as the CPU and can cool pretty good.  You could turn it off after launch or attach a thermostat.  I use the thermostat.  Send me your address in private email and I'll send you one.  I'm right down the road from NASA/Ames.  I quit using them in favor of closed loop cryogenic, but that would be way too heavy for your needs.



"Blake" <humanhunter@connectstar.net>
Sent by: owner-freebsd-hardware@FreeBSD.ORG

06/21/00 11:16 PM

       
        To:        <freebsd-hardware@FreeBSD.ORG>
        cc:        
        Subject:        Re: Hardware in space?




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
----- 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  information!  Thanks everyone!
>
> 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:
>
> - 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. 
>
> - 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:
>
>  http://aa.stanford.edu/~ssdl/
>  
> These guys are trying to get to where they can turn a satellite into  
> 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!  :-)
>  
> -- 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.
>
>
>  Thanks,
>
> Brian
> [Reporting in from Japan]
>  
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with  "unsubscribe freebsd-hardware" in the body of the message
>  

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