highaltitude.log.20090311

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[00:28] <Laurenceb> hi
[00:34] <shellevil> hi
[01:04] <Laurenceb> http://www.readwriteweb.com/archives/a_new_twist_to_the_adobe_vulnerability.php
[01:05] <Laurenceb> ^ thats what happened to my machine a while back :-/
[01:12] <SpeedEvil> :/
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[07:22] <jcoxon> morning
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[07:41] <jcoxon> hey G8KHW
[07:43] <G8KHW> hiya jcoxon
[07:44] <G8KHW> I just placed an order on the farnell site and got "The minimum Credit card order value is £20.00" any clues as to how I can avoid that?
[07:45] <jcoxon> hmmm, unfortunately not
[07:46] <jcoxon> just trying to login to see how much my previous orders were
[07:47] <jcoxon> js is still bad this weekend
[07:47] <jcoxon> i fear though that when the JS gets better for launching here that will be the end of the great trans-atlantic JS paths
[07:47] <G8KHW> yeah - the w/e after maybe
[07:47] <G8KHW> looks a bit better
[07:48] <G8KHW> I'll drop u a text sometime about a little idea I have
[07:48] <G8KHW> http://imagebin.org/40946 :-(
[07:49] <G8KHW> perhaps the trade account was a good idea after all
[07:49] <jcoxon> http://uk.farnell.com/frequently-asked-questions#OJ
[07:50] <jcoxon> G8KHW, sounds good - always keen to hear ideas...
[07:51] <G8KHW> yeah thats what I thought - there is an advantage - no min order and free next day
[07:52] <G8KHW> ok gotta go 2 work
[07:52] <G8KHW> cu
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[08:08] <jcoxon> hey defy
[08:08] <defy> hey jcoxon, hows things?
[08:08] <jcoxon> good thanks
[08:08] <jcoxon> you?
[08:09] <defy> pretty good
[08:09] <defy> studying, just thought i'd pop in and see how you guys were doing
[08:09] <jcoxon> well we haven't launched in the UK for quite a while, the JS has been terrible
[08:10] <jcoxon> but we've been working on a trans-atlantic payload
[08:10] <jcoxon> made quite a lot of progress
[08:10] <defy> yea you mentioned last time i was here, thats sounds pretty interesting
[08:10] <jcoxon> http://spacenear.us/wiki
[08:11] <defy> do you hope to recover it?
[08:11] <jcoxon> ummm if it managed to make it yes
[08:12] <jcoxon> but for the first attempt i reckon teh chances are low
[08:13] <defy> you really need some kind of cheap global communications dont you...satellite communication is so expensive =/
[08:13] <jcoxon> oh we might have that sorted
[08:13] <defy> we use it on our aircraft and its normally a couple of dollars per position report, it gets expensive when you're sending out one a minute
[08:13] <jcoxon> a hacked SPOT transmitter
[08:13] <jcoxon> its a simplex transmitter on globalstar
[08:14] <jcoxon> we've also got HF radio
[08:14] <jcoxon> so hopefully will be able to track it
[08:14] <defy> cool, what kind of range do you get with the radio?
[08:14] <defy> is spot an ELT?
[08:15] <jcoxon> more of a personal tracker
[08:16] <jcoxon> http://international.findmespot.com/
[08:16] <jcoxon> the radio potentially trans-atlantic
[08:16] <jcoxon> on the band i sometimes can pick up US stations
[08:16] <defy> yea im looking at it, very interesting...i didnt think you were allowed to use 406mhz for tracking...or is the tracking on a different frequency?
[08:16] <jcoxon> however they use a lot more power
[08:17] <jcoxon> oh its 40m so 7Mhz
[08:17] <defy> we have 406mhz elt's and if we set them off our opperator starts getting phone calls from our international airport and SAR teams in the city, lol
[08:18] <defy> is there a service charge?
[08:18] <jcoxon> yeah there is but its okay
[08:18] <jcoxon> we'll only be sending the coords occasionally say once an hor
[08:18] <jcoxon> hour*
[08:19] <defy> "$49.99/yr USD Tracking Upgrade Option" wow thats cheap
[08:19] <jcoxon> natrium42, has slightly hacked into it to get control so we can send our own data
[08:21] <defy> ontop of $115 usd, thats still pretty cheap if its a flat fee, i'd consider getting one if it is...
[08:22] <jcoxon> yeah its pretty cheap
[08:22] <jcoxon> they don't update much, i think you can get a message through every 5 to 10 mins
[08:22] <defy> yea this other site says every 10 minutes
[08:22] <jcoxon> chat to natrium42 some time he knows most of the info
[08:23] <jcoxon> i'm personally working on the ballast system for the balloon
[08:23] <defy> im going to be doing a lot of flying over some bad countryside soon, might be worth having some extra tracking
[08:23] <jcoxon> it seems a good deal
[08:25] <defy> hopefully by the end of this year i'll have dusted off all my gumstix and made an attempt at launching a balloon, i've made some friends at school that are keen on helping
[08:25] <jcoxon> amazing
[08:26] <jcoxon> have got a good way of doing the radio with the gumstix now
[08:26] <defy> yea? what are you using?
[08:26] <jcoxon> with a radiometrix attached directly to the audio out
[08:26] <jcoxon> and then generting wav files and playing them
[08:26] <jcoxon> steve has made code for rtty, packet and MFSK for it
[08:26] <defy> you get good range with those?
[08:27] <jcoxon> in theory a couple of hundred km
[08:27] <defy> wow
[08:27] <jcoxon> yeah
[08:27] <jcoxon> right i've got to dash
[08:27] <jcoxon> cya defy
[08:27] <defy> sweet, talk to you later :)
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[12:31] <mc-> natrium42, are you awake?
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[17:59] <hallam> fergusnoble: digikey stuff's here
[17:59] <hallam> In today's episode of "Henry burns himself doing something stupid" watch as we discover that the hot side of a Peltier junction is actually quite hot
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[18:20] <SpeedEvil> :)
[18:20] <SpeedEvil> BTDT
[18:20] <Xenion> Guten Abend alle miteinander :-) / Good evening folks ! :-)
[18:20] <SpeedEvil> though as a caveat, some sorts of peltier are at their absolute maximum temperature at 'serious burns' stage
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[18:40] <Laurenceb> hi
[18:40] <SpeedEvil> hi.
[18:40] <SpeedEvil> Note to self:
[18:41] <SpeedEvil> 10 sheets of 25mm kingspan doesn't really fit in a micra, even if you cut it in half.
[18:41] <hallam> do a Mr Bean?
[18:42] <SpeedEvil> It's fragile enough that it'd atomise in any wind at all
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[18:45] <jcoxon> evening all
[18:45] <jatkins> hi
[18:45] <Laurenceb> #mikrokopter
[18:45] <Laurenceb> hi jcoxon
[19:00] <jcoxon> hey Laurenceb
[19:02] <jcoxon> hey jatkins
[19:02] <jatkins> hi
[19:03] <jcoxon> hows it going?
[19:03] <jatkins> good thx. you?
[19:03] <jcoxon> tired
[19:04] <jatkins> bbl
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[19:35] Action: jcoxon has tubing
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[19:50] <SpeedEvil> :)
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[19:52] <jcoxon> there is something very satisfying about the click of a solenoid
[19:53] <SpeedEvil> jcoxon: you need some denatured alcohol.
[19:53] Action: SpeedEvil passes jcoxon a bottle of vodka with added dog-milk.
[19:54] <jcoxon> hehe
[19:54] <jcoxon> right well it works with water
[19:54] <jcoxon> one annoying thing is that the common port and the NC port are very closed together
[19:54] <jcoxon> so i had to trim the tubing a little
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[20:15] <jcoxon> hey natrium42
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[20:20] <Laurenceb> anyone seen watchmen?
[20:20] <Laurenceb> tany good?
[20:26] <shellevil> http://nickscipio.com/pod/2009/03/10/mutant-snowman/ :) (nsfw site, though worksafe pic)
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[21:03] <G8KHW> jcoxom: BTW the burst pressure on a PET fizzy drinks bottle is about 150PSI (10bar) - so would easilly contain things filled at ground pressure
[21:05] <shellevil> at 20C
[21:05] <shellevil> I'm not completely sure what happens at -55C when you take a 1 bar container, and depressurise it to 0 bar
[21:07] <shellevil> umm. ~0.7 bar, thank you Mr Boyle.
[21:09] <Hiena> shellevil, the bottle will be stable, but fragile.
[21:10] <Hiena> I made a similar test in the heat chamber.
[21:11] <Hiena> Filled PET bottle to 3 bar and set to -60.
[21:11] <Hiena> Hindsight, never ever try to drop it.
[21:12] <shellevil> :)
[21:15] <Hiena> Also found the -60 plexiglass means it will not disappear at this temperature, but it will be useless.
[21:17] <Hiena> I means not so much differenties between the frozen PET bottle properties and a frozen mil grade plexiglass.
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[21:20] <jcoxon> G8KHW, thanks
[21:20] <jcoxon> i've got some tubing now so can test
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[21:25] <G8KHW> also not too sure avout the chemistry of PET and glycol alcohol (if you plan to use that) - so also worth a try
[21:26] <jcoxon> yeah
[21:26] <jcoxon> will get some tomorrow
[21:27] <jcoxon> we should use the cheapy plastic bottles that you can get vodka in
[21:27] <jcoxon> :-p
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[21:32] <jcoxon> hey natrium42
[21:35] <natrium42> hi
[21:37] <jcoxon> got the valves working
[21:38] <jcoxon> am running 2L or water through now
[21:38] <jcoxon> seeing how long it takes
[21:38] <natrium42> whoa, nice
[21:38] <jcoxon> at normal pressure
[21:38] <natrium42> looking good?
[21:38] <jcoxon> yeah
[21:38] <shellevil> what head?
[21:38] <jcoxon> head?
[21:39] <shellevil> height of fluid columb is sometimes rrefered to as 'head'
[21:39] <jcoxon> oh right
[21:39] <jcoxon> it a 2L bottle
[21:39] <jcoxon> and then
[21:40] <jcoxon> a further 5cm to the valve
[21:40] <shellevil> 2l bottle with a vent in the top?
[21:40] <jcoxon> the bottle top is off
[21:41] <shellevil> the valve is connected to a tube going into the upright bottle, and the valve is 5cm below the base?
[21:41] <natrium42> jcoxon, pics plz
[21:41] <natrium42> dimensioned :D
[21:45] <jcoxon> http://www.flickr.com/photos/jcoxon77/3347859896/
[21:45] <jcoxon> hehe
[21:45] <jcoxon> i'm low on tape...
[21:46] <natrium42> lol
[21:47] <shellevil> is that water?
[21:47] <jcoxon> yup
[21:48] <jcoxon> i'll get some denatured alcohol tomorrow
[21:48] <shellevil> If you were feeling energetic, you could from that image compute the radius of the drops, and from their spacing, the flow-rate
[21:49] <jcoxon> hehe
[21:50] <jcoxon> i think the valve will be fine
[21:50] <jcoxon> size wise
[21:50] <jcoxon> and its running off 2 x AAA NiMh
[21:54] <jcoxon> 600mls in 15mins
[21:54] <jcoxon> bbiab
[21:55] <shellevil> Sounds like 1ml/s with alcohol is plausible
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[22:16] <jcoxon> oh dear, STS delayed
[22:18] <shellevil> :/
[22:18] <natrium42> orly?
[22:18] <natrium42> to tomorrow?
[22:19] <natrium42> boo ya
[22:19] <natrium42> sunday or monday
[22:19] <natrium42> jcoxon, we better have no leaks on *our* mission :P
[22:21] <jcoxon> hmmmm
[22:21] <gordonjcp> eep shit, speaking of fuel leaks
[22:21] <jcoxon> gonna need to epoxy everything
[22:21] <gordonjcp> I need to get my mate to bring his car round, well my car really
[22:21] <gordonjcp> so I can put a hose clip on the fuel filler pipe
[22:22] <gordonjcp> I did tell him not to fill the car beyond half a tank or turn it on its side
[22:23] <gordonjcp> "Dear NASA, a carefully-applied Ligarex clip will probably help you with your fuel leaks. It did for mine. Yours, Gordon"
[22:23] <natrium42> lol
[22:23] <natrium42> i am sure they will listen
[22:23] <natrium42> :P
[22:24] <jcoxon> natrium42, hows the flight 'puter going?
[22:25] <natrium42> i worked on some GPS stuff
[22:26] <natrium42> damn RF :/
[22:26] <natrium42> i will probably hire a company to do the RF section for me
[22:26] <shellevil> no luck?
[22:26] <natrium42> i have no idea how to do antenna matching
[22:26] <natrium42> and it's not working if i connect it directly
[22:27] <natrium42> (through a 100pF cap)
[22:27] <natrium42> that's for the chip antenna, btew
[22:29] <shellevil> R (number of check bytes in RS code word): 16  16  S (RS code word size in DMT frame): 2  8 
[22:29] <shellevil> gah
[22:32] Action: jcoxon searches for a 5L bottle
[22:33] Action: shellevil has one right here.
[22:34] <shellevil> (well, 2.4m up, 1m west.)
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