Date: Fri, 23 Jun 2000 00:25:19 -0700 From: rsowders@usgs.gov To: "Blake" <humanhunter@connectstar.net> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: Hardware in space? Message-ID: <OF38DADD3F.A91AC50B-ON88256907.0027E3FE@wr.usgs.gov>
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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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<br><font size=2 face="sans-serif">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.</font>
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<td><font size=1 face="sans-serif"><b>"Blake" <humanhunter@connectstar.net></b></font>
<br><font size=1 face="sans-serif">Sent by: owner-freebsd-hardware@FreeBSD.ORG</font>
<p><font size=1 face="sans-serif">06/21/00 11:16 PM</font>
<br>
<td><font size=1 face="sans-serif"> </font>
<br><font size=1 face="sans-serif"> To: <freebsd-hardware@FreeBSD.ORG></font>
<br><font size=1 face="sans-serif"> cc: </font>
<br><font size=1 face="sans-serif"> Subject: Re: Hardware in space?</font></table>
<br>
<br>
<br>
<br><font size=2 face="sans-serif">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 </font>
<br><font size=2 face="sans-serif">----- Original Message ----- </font>
<br><font size=2 face="sans-serif">From: "Brian Handy" <</font><a href=mailto:handy@isass0.solar.isas.ac.jp><font size=2 color=blue face="sans-serif"><u>handy@isass0.solar.isas.ac.jp</u></font></a><font size=2 face="sans-serif">></font>
<br><font size=2 face="sans-serif">To: <</font><a href="mailto:freebsd-hardware@FreeBSD.ORG"><font size=2 color=blue face="sans-serif"><u>freebsd-hardware@FreeBSD.ORG</u></font></a><font size=2 face="sans-serif">></font>
<br><font size=2 face="sans-serif">Sent: Wednesday, June 21, 2000 5:17 PM</font>
<br><font size=2 face="sans-serif">Subject: Re: Hardware in space?</font>
<br>
<br><font size=2 face="sans-serif">> Wow! What a great dose of information! Thanks everyone!</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> I've got a bunch of information, and a handful of people to respond to...</font>
<br><font size=2 face="sans-serif">> so stand by, those of you who know who you are. Anyway, a couple of</font>
<br><font size=2 face="sans-serif">> clarifications since I stirred up so much interest:</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> - This is only the proposal stage of the instrument. The way NASA works</font>
<br><font size=2 face="sans-serif">> is every year they make "Announcements of Opportunity", which is a thingy</font>
<br><font size=2 face="sans-serif">> that invites us to write proposals to do work. There are lots of various</font>
<br><font size=2 face="sans-serif">> categories of this, from data analysis of Solar Flares to theoretical</font>
<br><font size=2 face="sans-serif">> consideration of pulsar evolution to proposing new instruments for the</font>
<br><font size=2 face="sans-serif">> Next Generation Space Telescope. If we win, we'd start working on this</font>
<br><font size=2 face="sans-serif">> sometime next year, probably, with a launch slated for about 3 years after</font>
<br><font size=2 face="sans-serif">> that. </font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> - The sounding rocket environment isn't quite as bad as it sounds. The</font>
<br><font size=2 face="sans-serif">> computer will be grounded to the chassis, but this doesn't mean it's going</font>
<br><font size=2 face="sans-serif">> to get real cold. We've only got 5 minutes above the atmosphere, and I</font>
<br><font size=2 face="sans-serif">> think it'd take a fair bit longer than that to get cold enough to matter.</font>
<br><font size=2 face="sans-serif">> There's a group at Stanford that's taken this to an extreme:</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> </font><a href=http://aa.stanford.edu/~ssdl/><font size=2 color=blue face="sans-serif"><u>http://aa.stanford.edu/~ssdl/</u></font></a>;
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> These guys are trying to get to where they can turn a satellite into </font>
<br><font size=2 face="sans-serif">> senior thesis project for a student. (I don't think they've gotten it</font>
<br><font size=2 face="sans-serif">> down to a year yet, though.) Basically they're working on the level of</font>
<br><font size=2 face="sans-serif">> re-inventing Sputnik. Amazing stuff, amazingly simple, teaches people a</font>
<br><font size=2 face="sans-serif">> bunch. Way below the level of sophistication I have to aim for,</font>
<br><font size=2 face="sans-serif">> unfortunately. I'm told some of their electronics parts come from Radio</font>
<br><font size=2 face="sans-serif">> Shack! :-)</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> -- While getting too cold probably isn't an issue, COOLING certainly is.</font>
<br><font size=2 face="sans-serif">> As a few people have alluded to, cooling in space becomes an issue because</font>
<br><font size=2 face="sans-serif">> there's no air. This will be a problem much earlier, because we'll</font>
<br><font size=2 face="sans-serif">> evacuate the payload several hours before launch. If there's a delay, the</font>
<br><font size=2 face="sans-serif">> package could wind up sitting on the launch rail for a few days under</font>
<br><font size=2 face="sans-serif">> vacuum. I've worried about blowing the top off the CPU from the heat. I</font>
<br><font size=2 face="sans-serif">> imagine it'll probably have to be heat-sunk to the chassis in some manner.</font>
<br><font size=2 face="sans-serif">> Someone mentioned using a 486; that's not such a bad idea. Mostly I'm</font>
<br><font size=2 face="sans-serif">> just grabbing data from the RS-232 ports and stuffing it to disk, so I'll</font>
<br><font size=2 face="sans-serif">> probably wind up doing some experimentation to see just what I'll need.</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> Thanks,</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> Brian</font>
<br><font size=2 face="sans-serif">> [Reporting in from Japan]</font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> </font>
<br><font size=2 face="sans-serif">> To Unsubscribe: send mail to </font><a href=mailto:majordomo@FreeBSD.org><font size=2 color=blue face="sans-serif"><u>majordomo@FreeBSD.org</u></font></a>
<br><font size=2 face="sans-serif">> with "unsubscribe freebsd-hardware" in the body of the message</font>
<br><font size=2 face="sans-serif">> </font>
<br>
<br>
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