highaltitude.log.20110525

[00:00] <SpeedEvil> Various GPSs misimplement the COCOM limits.
[00:00] <SpeedEvil> The COCOM limits are that the GPS shall not provide a position solution when over 1000knots and 60000 feet.
[00:00] <SpeedEvil> Some GPSs do OR instead of AND
[00:01] <SpeedEvil> http://ukhas.org.uk/guides:gps_modules
[00:01] <nelly11> thank you SpeedEvil
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[02:48] <Bahiense> hello everybody... I have a couple of questions regarding HAB
[02:50] <SpeedEvil> ?
[02:51] <natrium42> continuer, s'il vous plait
[02:54] <Bahiense> sorry, I'm back
[02:55] <Bahiense> first of all... is it necessary to cut the line from the balloon once it bursts? I've seen some implementations of a nicrom wire in order to do that, but I've also seen landings where the balloon is still attached to the payload, so I'm not sure
[02:56] <SpeedEvil> GEnerally not.
[02:57] <SpeedEvil> The balloon should burst cleanly
[02:57] <SpeedEvil> But it doesn't always.
[02:57] <SpeedEvil> You also woul need something faster than nichrome.
[02:57] <SpeedEvil> Or you can cut down first.
[02:57] <SpeedEvil> In practice, with a parachute, and long strings with proper spacing, it's not been an issue.
[02:58] <Bahiense> That's another thing I've been noticing... what would be the proper spacing between the components in the stack?
[02:59] <SpeedEvil> A 20m string or so - with one third from the payload to parachute, one third parachute to balloon is popular - or so.
[03:00] <Bahiense> Should I include a radar reflector in the stack? is it worth it?
[03:01] <Darkside> we're required to have one in australia
[03:01] <SpeedEvil> Where are you?
[03:01] <Bahiense> Argentina... not exactly a lot of launches here... yet :)
[03:02] <Darkside> i won't fry for you
[03:02] <Darkside> cry*
[03:02] <Bahiense> lol
[03:02] <Darkside> sorry, i've never talked to anyone from argentina before
[03:02] <Darkside> i've always wanted to say that
[03:03] <Bahiense> I bet :P
[03:04] <Bahiense> so, in that case, would you put the reflector between the parachute and the payload?
[03:04] <SpeedEvil> Bahiense: First I'd investigate the legality.
[03:05] <Bahiense> sure, I'm just figuring it out in case it's needed
[03:05] <SpeedEvil> It varies from 'call the local airport' to 'totally illegal'
[03:08] <Bahiense> yeah, I guess... I've been taking a look at some documents but so far there's no mention of it
[03:10] <Bahiense> also, any ideas for experiments other than temperature/pressure/humidity sensors?
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[03:16] <SpeedEvil> Dust might be interesting - though it's questionable if any of the icelandic volcano dust would reach you.
[03:16] <SpeedEvil> So perhaps less so.
[03:22] <Bahiense> I guess... by the way, do you know if somebody has explored the possibility of releasing some kind of "microglider" from a balloon?
[03:23] <SpeedEvil> Laurenceb has.
[03:23] <SpeedEvil> A parafoil.
[03:23] <SpeedEvil> Or rolago.
[03:23] <SpeedEvil> He's - probably - asleep right now.
[03:23] <Dan-K2VOL> yeah, UAV laws in the USA are restrictive of that, though may have changed recently
[03:24] <Bahiense> Has he actually launched something like that already?
[03:24] <SpeedEvil> He did - it diddn't work for reasons that were not fundamental.
[03:24] <SpeedEvil> He hasn't relaunched it.
[03:24] <Bahiense> I see
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[06:45] <griffonbot> Received email: James Coxon "Re: [UKHAS] Re: UK Balloon Flight Guidelines"
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[07:05] <nelly11> Hi! What equipment do I need to build the cutdown mechanism...I think there isn't enough info about that on the UKHAS page for a beginner
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[08:13] <nelly11> Hi, anyone knows of a kind of sensor I can use on board a HAB to determine when a mechanism (for the release of a solar sail for e.g.) has been operated?
[08:13] <Randomskk> microswitch?
[08:18] <nelly11> I've never used one before and don't really know what it is :S but reading online just now, is that not something you use to operate mechanisms?
[08:18] <Randomskk> it's just a switch
[08:19] <SamSilver> nelly11: http://www.sparkfun.com/products/9414
[08:19] <nelly11> and how does using the switch confirm that the mechanism has been deployed?
[08:20] <Randomskk> you just position it so that the mechanism presses the switch or something. it really depends on your mechanism
[08:20] <SamSilver> nelly11: I like these: http://www.sparkfun.com/products/10601
[08:21] <nelly11> the release mechanism I am planning to use is similar to the cutdowm mechanism
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[08:44] <SamSilver> nelly11: these are strong and tuff and can take the cold: http://www.amazon.com/HIGH-POWER-DOOR-LOCK-ACTUATOR/dp/B0002KR9PW
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[09:25] <Chingy> Hi all
[09:28] <mattltm-alt> Hi :)
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[10:59] <Elwell> http://uk.news.yahoo.com/n-z-truckie-blew-balloon-freak-accident-022506215.html
[10:59] <Elwell> well, sort of baloon related :-)
[11:09] <Laurenceb> it wasnt helium
[11:11] <Laurenceb> how can i raw read from an sd card on *nix?
[11:11] <LazyLeopard> Probably just as well...
[11:11] <SpeedEvil> Laurenceb: What do you mean by raw.
[11:12] <Laurenceb> individual bytes, no file system
[11:12] <Laurenceb> cat /dev/sdb works, but i need to seek
[11:12] <SpeedEvil> dd
[11:12] <Laurenceb> and not dump the endire 4GB !
[11:13] <Laurenceb> is there a way to seek to an address and dump x bytes?
[11:13] <SpeedEvil> dd works for arbitrary. See count=,seek,blocks options
[11:13] <Laurenceb> ok
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[11:22] <Keni> Hi...
[11:22] <Keni> I'm a newbie, in case that wasn't obvious...
[11:23] <NigeyS> :)
[11:23] <Keni> I'm after any advice on who to contact at the CAA...
[11:23] <SpeedEvil> You're in the UK then?
[11:24] <SpeedEvil> And where in the UK - you may be able to use an approved launch site.
[11:25] <Keni> Sorry, i didn't realise this was an international board...
[11:25] <Keni> Yes, I'm in the UK and I'm thinking of launching at a specific site in Kent
[11:25] <Keni> In conjunction with an event at the same location
[11:25] <SpeedEvil> Ah.
[11:26] <Laurenceb> can someone explain how sd block addresses work?
[11:26] <SpeedEvil> I know some people in here who've dealt with getting the CAA to approve - I'm unsure who though.
[11:26] <SpeedEvil> Laurenceb: It's a disk.
[11:26] <Laurenceb> is block 2 address 1 or 512?
[11:26] <SpeedEvil> Laurenceb: Just a sequence of blocks.
[11:27] <Laurenceb> the block size is 512 bytes right?
[11:27] <SpeedEvil> Block 0 is bytes 0-511, block 1 512-1023 ...
[11:27] <SpeedEvil> Usually.
[11:27] <Laurenceb> got it
[11:27] <Laurenceb> so those are addresses?
[11:27] <Laurenceb> as in if i set the sd card address to 512 its at the start of block1?
[11:28] <SpeedEvil> What do you mean 'set the sd card address'
[11:29] <Keni> ok, thank you for you help.... I'll ask the message board...
[11:29] <SpeedEvil> Mailing list, you mean?
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[11:32] <NigeyS> Blocks start (not surprisingly) on 512 byte boundaries. If you are using the media as raw storage and therefore not using a file system. You can write starting on any 512 byte boundary.
[11:32] <NigeyS> if that's any help Laurenceb
[11:39] <Laurenceb> i think ive got it now
[11:39] <Laurenceb> just wrote deadbeef to the card
[11:41] <SpeedEvil> What're you talking to it from?
[11:44] <Laurenceb> xscale board
[11:44] <SpeedEvil> Oh - that.
[11:56] <DanielRichman> Laurenceb: https://github.com/danielrichman/alien/blob/master/alien1/atmega162/final/log.c [SD card atmega spi] may be of use to you, but it's a bit messy since it's all interrupt driven, and I had some irrational ideas about preserving space in ram and rom
[11:57] <Laurenceb> neat
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[12:39] <griffonbot> Received email: Keni "[UKHAS] CAA contact?"
[12:44] <griffonbot> Received email: Philip Heron "Re: [UKHAS] CAA contact?"
[12:57] <griffonbot> @N9XTN: NSTAR #ARHAB Flight 11-B will hopefully fly either Sat or Sun AM this weekend, depending on wx forecast. Launch site near Valley. nstar.org [http://twitter.com/N9XTN/status/73372100773150720]
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[13:00] <jonsowman> er :\
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[13:04] <priyesh> sorry if i just spammed :P
[13:04] <priyesh> putty -> right click :(