highaltitude.log.20060220

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[03:18] <Professor> hrm, 1 watt amateur tv transmitter for $139
[03:18] <Professor> (us)
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[11:28] <Neutrino> hi
[11:28] <malgar> hi
[11:28] <Neutrino> hows it going
[11:29] <malgar> mmh i'm tired of snow mixed rain
[11:29] <Neutrino> weve had just rain for two days, yeah gets to you doesn't it!
[11:30] <Neutrino> any luck with finding out about balloon laws in italy?
[11:31] <malgar> no answers yet :(
[11:32] <Neutrino> ive been looking into radiation doses at high altitude
[11:33] <Neutrino> yawn :)
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[11:54] <Neutrino> anyone know if there is much practical lift difference between using Balloon gas (Helium/oxygen) and pure Helium in a balloon?
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[12:03] <malgar> sure..! helium is 8 times lighter tha helium
[12:03] <malgar> oxygen
[12:04] <malgar> perhaps 16 times because oxygen has two atoms in the molecule
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[12:17] <Neutrino> right thanks, might be worth going for pure He then.
[12:17] <Neutrino> hi james
[12:19] <jcoxon> hi
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[12:21] <Neutrino> I checked out that Xetex radiation meter, works fine, but I had a look into the typical doserates of passenger jets, and it seems to be around 8 microsiverts per hour, I think the Xetex will only count a few digits in the whole flight.
[12:23] <Neutrino> but I do have a few other more sensitive detectors kicking around, what spare inputs do you have on your computer?
[12:23] <jcoxon> only GPIOs
[12:24] <Neutrino> would you be able to count a 5v pulse on a pin every time there is a count? typically 2-3 counts per sec
[12:25] <Neutrino> the other option is I can put a bigger GM-Tube onthe Xetex, the count wouldn't mean anything but it would store a total ...
[12:30] <Neutrino> .. actually if I measure the counts comming off the existing tube in the xetex, I can probably work out a factor!
[12:30] <jcoxon> hehe
[12:30] <jcoxon> well
[12:30] <jcoxon> i could probably count off a GPIO (not sure exactly how)
[12:31] <Neutrino> would need to be an interupt really, or check the state of the pin quite often..
[12:31] <jcoxon> though you say a passenger jet only gets a few readings i'm going to be achieving far higher
[12:32] <Neutrino> yes, true it will probably get much high dose rates, it's just that every intrument has to justify it's own weight! :)
[12:32] <jcoxon> indeed
[12:32] <jcoxon> did at one point have a spare serial port but now thats begin used by the temp. sensor
[12:32] <Neutrino> temperature is quite useful!
[12:32] <jcoxon> yeah
[12:33] <jcoxon> will be interesting to compare conditions inside and outside the payload
[12:33] <jcoxon> gumstix themselves are interested to see what the operating conditions are
[12:33] <Neutrino> indeed, they are getting free space research, hope they gave you the cpu :)
[12:33] <jcoxon> sadly not :(
[12:33] <jcoxon> perhaps soon
[12:34] <Neutrino> they should be sponsering you!
[12:34] <jcoxon> if i end up going to niger to launch balloons this summer i'm going to ask for quite a few
[12:35] <Neutrino> what height are you hoping for?
[12:36] <Neutrino> your using a bigger balloon this time right?
[12:37] <jcoxon> hoping for + 100,000ft
[12:37] <jcoxon> yeah and i've got 1200g balloon instead of 200g
[12:38] <Neutrino> nice! very nice. true near space
[12:38] <jcoxon> yeah
[12:38] <jcoxon> the payload weight hasn't changed that much
[12:38] <jcoxon> so should be achievable
[12:39] <Neutrino> much higher than that and the outgassing of electronic components will be an issue (need space hardware!)
[12:40] <Neutrino> it's even more important to include a rate meter, will be fascinating to see the rad level, normally space harware is radiation hardened, I don't know where the cut off is..
[12:41] <jcoxon> :-D
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[12:42] <jcoxon> i better be off
[12:42] <jcoxon> got a hockey match to umpire
[12:42] <jcoxon> will chat later
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[12:44] <Neutrino> cya
[12:44] <Neutrino> i'll be here till 5:00pm, will look into the rad thing further.
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[15:04] <jcoxon> hi Neutrino, just emailed the gumstix mailing list to look into its possible for me to monitor the 5v through a GPIO
[15:14] <Neutrino> good one
[15:14] <Neutrino> btw - sent you an email with the results of my research into cosmic dose..
[15:14] <jcoxon> yeah i got it
[15:15] <jcoxon> thanks
[15:15] <Neutrino> in some ways would be nice to measure rate vs altitude.. just depends on the GPIO
[15:18] <Neutrino> been trying to think of another way, to record the rate, what about a little MP3 player or tape recorder? record the clicks - bit cheesy??
[15:19] <jcoxon> i don't see why the GPIO can't handle it
[15:19] <jcoxon> got a 200mhz processor
[15:21] <jcoxon> here we go
[15:21] <jcoxon> http://gumstix.org/tikiwiki/tiki-index.php?page=Kernel-Programming
[15:21] <jcoxon> love the gumstix mailing list
[15:22] <jcoxon> so speedy in results
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[16:03] <Neutrino> sounds good.
[16:03] <Neutrino> i'll see what hardware ive got, and sort something out, weve always got the Xetex to fall bak on.
[16:05] <jcoxon> yeah, thanks for all this help Neutrino
[16:06] <jcoxon> though as a warning I'm intending to launch in 11 days!
[16:14] <phatmonkey_> ooh, awesome
[16:16] <phatmonkey_> wow, I haven't been keeping track of updates, you didn't update the rss feed :o
[16:16] Nick change: phatmonkey_ -> phatmonkey
[16:25] <jcoxon> phatmonkey, yeah sorry got bored of handcoding
[16:25] <jcoxon> hehe
[16:25] <phatmonkey> hehe
[16:25] <phatmonkey> time for a blog...
[16:25] <jcoxon> hmmmm maybe
[16:25] <jcoxon> seriously need to get working
[16:26] <jcoxon> and permission hasn't come through yet
[16:28] <jcoxon> still having payload container issues - have one but just not happy with it
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[00:00] --- Tue Feb 21 2006