highaltitude.log.20091015

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[01:38] <josepharmbruster> hey, i need some gps module advice
[01:38] <josepharmbruster> anyone around ?
[01:39] <josepharmbruster> i'm wondering about USB gps units and their performance from 30k-100k feet
[01:39] <josepharmbruster> and if anyone has any good suggestions / experiences to share
[01:41] <SpeedEvil> you need to look on the wiki for the list of chipsets that's on there.
[01:41] <SpeedEvil> generally the chipset is the imprtant bit
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[01:55] <josepharmbruster> SpeedEvil: thanks!
[01:57] <josepharmbruster> SpeedEvil: did you mean the ukhas wiki?
[02:00] <juxta> josepharmbruster: there's a list on the wiki, the link is:
[02:00] <juxta> http://ukhas.org.uk/guides:gps_modules
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[11:31] <edmoore> hi RocketBoy
[11:40] <RocketBoy> yo edmoore - hows life
[11:42] <RocketBoy> I'm just playing with some 868MHz gear
[11:48] <edmoore> ah neat
[11:49] <edmoore> what's on th receiver?
[11:49] <Laurenceb> cool
[11:49] <edmoore> I'm just faffing in library between lectures
[11:49] <Laurenceb> how do you suggest getting 500mw?
[11:49] <edmoore> had a bit of a brain-melt earlier
[11:49] <Laurenceb> I was looking at maxim power amp ICs
[11:49] <Laurenceb> brain storm?
[11:49] <Laurenceb> fusion
[11:49] <Laurenceb> synergy
[11:49] <edmoore> proving Cramer-Rao lower bound in some multi-dimensional way.
[11:49] <edmoore> it meanss nothing to me either
[11:49] <Laurenceb> :P
[11:50] Action: Laurenceb is trying to solve a maths problem sheet by 2pm :-/
[11:50] <Laurenceb> its like being an undergrad again
[11:50] <edmoore> i don't havve examples papers anymore
[11:50] <edmoore> joys of 4th year
[11:50] <RocketBoy> I got a IC-R7000 for the RX - covers 25MHz to 2GHz
[11:51] <edmoore> i guess you could use a tv pre-amp too?
[11:51] <RocketBoy> I'm using the Radiometrix TX3H - 450mW on 869.5MHz
[11:52] <RocketBoy> yeah and I'm going to try a TV yagi
[11:52] <edmoore> oh nice rig!
[11:52] <RocketBoy> as its so close in frequency
[11:52] <edmoore> oh nice rig!
[11:52] <edmoore> whoops
[11:53] <RocketBoy> I'm also going to try out the Radiometrix RX3G as a RX
[11:53] <Laurenceb> TX3H sounds perfect for us
[11:53] Action: Laurenceb is working on decoding c code
[11:53] <Laurenceb> well... I was
[11:54] <Laurenceb> trying to do a DLL/FLL with fm
[11:54] <RocketBoy> I think packet radio soundcard software is the simple way to go
[11:54] <Laurenceb> hmm I want to have some nice code thats easy to rewrite
[11:54] <SpeedEvil> Laurenceb: Can you make the code multipurpose, so it can also do GPS and MRI?
[11:54] <Laurenceb> heh
[11:54] <Laurenceb> talking to soundcard is easy
[11:55] <edmoore> in C?
[11:55] <Laurenceb> yes
[11:55] <edmoore> what lib?
[11:55] <Laurenceb> well, on linux
[11:55] <SpeedEvil> open, iocrl, read
[11:55] <RocketBoy> yeah - there is some great soundcard software around
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[11:56] <edmoore> neat
[11:56] <Laurenceb> http://pastebin.com/m3563c1b2
[11:56] <Laurenceb> thats my code
[11:56] <Laurenceb> well - talk to soundcard code
[11:56] <RocketBoy> there is an auto-corrolation scope wich I used on the coast work - it really picks out signals in the noise
[11:57] <edmoore> awesome
[11:57] <Laurenceb> that pipes to the bitstream decoded, and that pipes to the packet finder/FEC code
[11:57] <edmoore> ok, time to go to ne4xt lecture
[11:57] <edmoore> catch you guys later
[11:58] <Laurenceb> cya
[11:58] <RocketBoy> cu
[11:59] <Laurenceb> its a bit tricky as the DLL has to look at bitflip points
[11:59] <Laurenceb> and the FLL... I'm not sure
[12:00] <Laurenceb> I'm trying to use phase information over a single bit
[12:00] <SpeedEvil> you mean decode SSB or FM output of the FM waveform
[12:00] <Laurenceb> bit I'm working under the assumtion that there is no long term phase coherency
[12:00] <Laurenceb> SSB
[12:00] <Laurenceb> through the soundcard
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[12:01] <SpeedEvil> Random thougts.
[12:01] <SpeedEvil> you know the bitrate
[12:01] <SpeedEvil> so take fourier with a window length of a bit period
[12:01] <SpeedEvil> then the ...
[12:02] <SpeedEvil> hmm - that won't work optimally
[12:02] <Laurenceb> yeah thats kind of what I'm doing now
[12:02] <SpeedEvil> I was thinking it'd come out as a phase then, but of course it won't
[12:02] <Laurenceb> only I have 4 complex integration bins
[12:02] <RocketBoy> There seem to be a lot of tubular antennas emergining in the home-brew wifi area eg: http://www.turnpoint.net/wireless/antennas/mypringles.html
[12:02] <RocketBoy> does anyone know if they actually work?
[12:02] <Laurenceb> high, low and probe high and low
[12:02] <Laurenceb> the probe bins are offset in frequency by haft the baud rate
[12:03] <RocketBoy> tis the 1st time I have seen ta design like that
[12:03] <Laurenceb> and you compare the phase of the probe bin with the high/low bin
[12:03] <SpeedEvil> FFT at half the bit-period
[12:03] <Laurenceb> han also sub optimal
[12:03] <Laurenceb> I think my technique is closer to optimal
[12:03] <Laurenceb> then you take the argument of the bins
[12:04] <Laurenceb> it should be pi/2 difference
[12:04] <Laurenceb> any difference suggests the LO is off from the carrier
[12:04] <SpeedEvil> now, for each frequency bin, and for a period of 5 seconds, compare the bin-400hz and see if there is a strong inverse correlation.
[12:04] <Laurenceb> guess
[12:05] <SpeedEvil> this uses the fact that the energies in the two frequency bins are going to be very different
[12:06] <Laurenceb> yeah when I looked at it, argument info is slightly more noise tolerant than magnitude
[12:06] <SpeedEvil> I don't think it matters - for the decoding ASCII case - for heavily FEC streams, maybe
[12:07] <SpeedEvil> as in hte ascii case, hte bits have to be so far above the noise anyway
[12:07] <SpeedEvil> umm
[12:08] <SpeedEvil> you take a waterfall diagram
[12:08] <SpeedEvil> and then do a 2d fft of it
[12:08] <SpeedEvil> the signals with 50/100/...Hz energy will be very obvious
[12:09] <SpeedEvil> And you can just look for a bin with 50/100/...hz energy that has the opposite phase as the bin 400hz higher - for example
[12:09] <Laurenceb> yeah thats kind of what I'm doing
[12:09] <Laurenceb> only neater and quicker
[12:10] <SpeedEvil> you can do lots faster if you don't want to lock
[12:12] <Laurenceb> http://pastebin.com/m53133a16
[12:13] <Laurenceb> thats my present code - just the basics done atm
[12:13] <Laurenceb> its going to use a lookup table for the local osc
[12:15] <SpeedEvil> you're not doing tracking yet are you
[12:15] <Laurenceb> thats the tracking code but its not working yet
[12:17] <SpeedEvil> Sorry, I'm getting ready to prepare the boiling oil.
[12:17] <SpeedEvil> more shed-painting
[12:17] <Laurenceb> heh
[12:18] <Laurenceb> wood treatment is pretty cheap you know
[12:18] <SpeedEvil> Yeah.
[12:18] <SpeedEvil> I have the stuff here. It's already been coated several times with it.
[12:18] <SpeedEvil> (not by me)
[12:18] <SpeedEvil> and otherwise I'd have to dispose of the oil.
[12:19] <SpeedEvil> And it's ~30m^2 of rough wood - which gets to the slightly less cheaper
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[13:02] <rjharrison_> Horray PCB for Icarus III has arrived. Pics later
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[13:08] <SpeedEvil> :)
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[14:27] <Laurenceb> http://conference.ukseds.org/programme
[14:27] <Laurenceb> CU Spaceflight (U. of Cambridge): CUS activities <- whos going?
[14:27] Action: SpeedEvil sighs.
[14:28] <Laurenceb> too far away?
[14:29] <SpeedEvil> yeah
[14:29] <SpeedEvil> also transport problem
[14:29] <SpeedEvil> And bastard driving instructors.
[14:30] <SpeedEvil> I can't find one willing to drive me to driving test tomorrow - short term cancellation came up on DSA website
[14:30] <gordonjcp> !
[14:30] <gordonjcp> normally they're happy to relieve you of an extra lesson fee for that sort of thing
[14:31] <SpeedEvil> in my car
[14:31] <SpeedEvil> and they haven't seen me before - my regular is in turkey
[14:32] Action: SpeedEvil has a stupid script to poll the DSA website for newly freed up appointments
[14:33] <SpeedEvil> BNP lols.
[14:34] <Laurenceb> hmm you should be able to run whatever rules you want
[14:35] <SpeedEvil> As long as they comply with the law of the land.
[14:37] <SpeedEvil> still basically waiting on a suitable ride for your rolago?
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[15:11] <Laurenceb> hmm
[15:12] <edmoore> Laurenceb: i think we are going to that
[15:12] <Laurenceb> not really - I'm busy
[15:12] <Laurenceb> ok cool
[15:12] <edmoore> given the website says we're talking at it
[15:12] <Laurenceb> lol
[15:12] <Laurenceb> I meant you personally
[15:12] <edmoore> we're talking at the same time as helen page. ironic as she kept b eing a topic of conversation at amsat
[15:12] <edmoore> oh. yes, i am personally, i assume
[15:13] Action: Laurenceb doesnt know who that is
[15:13] <edmoore> we were invited on the back of the amsat talk and fergus and I gave that so i assume they want the same talk
[15:13] <Laurenceb> neat
[15:13] <Laurenceb> what were you talking about amsat for?
[15:17] <edmoore> talking at the amsat colloqium
[15:17] <edmoore> about cusf
[15:17] <edmoore> and hab
[15:17] <Laurenceb> ah cool
[15:17] <Laurenceb> I might venture to Guildofrd
[15:17] <edmoore> is that where seds is?
[15:18] <Laurenceb> http://conference.ukseds.org/
[15:18] <edmoore> probably the only way they could get martin sweeting to give a speech
[15:18] <edmoore> bring themselves to right under his nose
[15:21] <SpeedEvil> Laurenceb: another MRI
[15:21] <SpeedEvil> Laurenceb: whole body scan with 10cm resolution - for fat measurement
[15:21] <Laurenceb> bah SSTL
[15:22] <Laurenceb> SpeedEvil: I guess so
[15:22] <SpeedEvil> Make it shiny, with lots of beepy stuff, and you could sell lots of them to gyms.
[15:22] <Laurenceb> arent there body fat measureing devices already
[15:22] <SpeedEvil> yes.
[15:22] <Laurenceb> I'm not convinced they work
[15:23] <Laurenceb> how are they supposed to work?
[15:23] <SpeedEvil> But they aren't walk-in scanners with lots of beeps that do the image in 10s.
[15:23] <SpeedEvil> which give a nice breakdown of where the fat is
[15:24] Action: Laurenceb tries to work out how they work
[15:24] <SpeedEvil> I think many work on resistance
[15:25] <Laurenceb> http://www.weightlossresources.co.uk/body_weight/body_fat/percentage.htm
[15:25] <SpeedEvil> yes. MRI is the gold standard.
[15:26] <SpeedEvil> Which is never used in gyms.
[15:26] <SpeedEvil> for obvious reasons
[15:26] <Laurenceb> rather like me then
[15:26] <Laurenceb> never seen in gyms for good reasons
[15:27] <SpeedEvil> You have rippling muscles, and no need of gyms?
[15:28] <Laurenceb> lol I wish
[15:32] Action: SpeedEvil is in better shape than he thought.
[15:32] <SpeedEvil> I lost 8kg over the last year
[15:32] <SpeedEvil> I still really need to lose another 10-15
[15:36] Action: Laurenceb isnt overwieght just not too fit
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[15:49] <Laurenceb> http://techtv.mit.edu/videos/4149-indoor-autonomous-helicopter
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[16:12] <SpeedEvil> neat
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[16:33] <rjharrison> Ping edmoore
[16:33] <rjharrison> ICARUS III has arrived
[16:33] <edmoore> yo
[16:33] <rjharrison> :)
[16:33] <edmoore> awesome
[16:33] <rjharrison> Some soldering going on tonight
[16:33] <edmoore> :)
[16:34] <edmoore> got any photos?
[16:35] <rjharrison> http://www.robertharrison.org/images/various/IMG_3436.JPG
[16:35] <rjharrison> edmoore just puting one up
[16:35] <edmoore> very nice
[16:35] <rjharrison> Bit late for recommendations
[16:36] <rjharrison> But any pointers would be usefull
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[16:36] <edmoore> have a beer before soldering :)
[16:36] <edmoore> coffee = handshake
[16:36] <rjharrison> True
[16:36] <rjharrison> Not too small
[16:37] <rjharrison> not like B2 or BCUB
[16:37] <edmoore> i need to fetch b2 from my car
[16:37] <rjharrison> cool
[16:37] <SpeedEvil> Not too bad
[16:37] <rjharrison> chat later
[16:37] <edmoore> Randomskk: if i don't have b2 with me in an hour, remind me
[16:37] <rjharrison> THanks SpeedEvil
[16:37] <SpeedEvil> nothing really fine pitch
[16:37] <SpeedEvil> I mean too bad to solder
[16:37] <SpeedEvil> pcb looks fine
[16:37] <SpeedEvil> well
[16:37] <rjharrison> Cheers
[16:37] <SpeedEvil> other than gold
[16:37] <edmoore> :p
[16:37] <SpeedEvil> which can be annoying to solder
[16:38] <SpeedEvil> Or at least I've found it so - maybe it's me
[16:38] <rjharrison> SpeedEvil it's not too bad with a flux pen
[16:39] <rjharrison> Will let you know later :)
[16:39] <rjharrison> right meeting
[16:39] <rjharrison> bbiab
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[16:40] <edmoore> oh shit, it's a 5 not 5.30
[16:40] <edmoore> i'd better be off
[16:41] <SpeedEvil> wve
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[17:42] <grummund> hi, does someone have a url for the pdf of the BBC article from the Bang programme, please?
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[17:49] <Sparky68> Evening all
[17:52] <rjharrison> Humm There was one
[17:52] <rjharrison> grummund search the logs for pdf
[17:54] <grummund> hmm, i don't log this channel... is there a public log?
[17:55] <rjharrison> http://randomsolutions.co.uk/gash/focusmag001.pdf
[17:55] <rjharrison> There you are grummund
[17:55] <rjharrison> You owe me one :)
[17:56] <rjharrison> 7 Aug Log on ukhas wiki
[17:56] <grummund> ah, thank you :)
[17:56] <grummund> yes make a note... iou
[17:56] <rjharrison> lol
[17:57] <SpeedEvil> you want the video?
[17:57] <SpeedEvil> I posted it to rapidshare - the link should be there in the logs
[17:58] <grummund> oh wait... i do have logs :p
[17:58] <grummund> sorry
[17:59] <Laurenceb> rapidshare?
[17:59] <Laurenceb> you dirty ...
[18:00] <SpeedEvil> http://rapidshare.com/files/271499858/Bang_Goes_the_Theory_Series_1_-_Episode_4_b00m704v_default.mov.html
[18:00] <grummund> thanks
[18:08] <Laurenceb> http://s2.b3ta.com/host/creative/50750/1255539699/whorses.jpg
[18:13] <sbasuita> :/
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[18:31] <jcoxon> evening
[18:36] <Sparky68> evening
[18:37] <jcoxon> hey Sparky68 hows teh planning going?
[18:42] <Laurenceb> http://pastebin.com/m22f45516
[18:43] <Laurenceb> thats the basic outline of the code done - talks to sound card and output a bitstream
[18:43] <jcoxon> wow Laurenceb
[18:43] <jcoxon> good work
[18:43] <gordonjcp> nice
[18:44] <gordonjcp> how are you doing frequency detection?
[18:49] <jcoxon> hmmm sunday looks okay for a launch
[18:49] <jcoxon> though it has a kent landing
[18:51] <Laurenceb> gordonjcp: high and low frequency bins
[18:51] <rjharrison> Ping jcoxon
[18:51] <Laurenceb> its not running yet
[18:56] <Laurenceb> need to sort out unit conversions ect
[18:56] <Laurenceb> also work out how to get it to lock onto the signal to start with
[18:56] <Laurenceb> I'm thinking a search for the callsign
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[19:03] <jcoxon> hey natrium42
[19:03] <natrium42> jo
[19:04] Nick change: bittwist -> RageMajesty
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[19:07] <gordonjcp> Laurenceb: so FFTs?
[19:07] <Laurenceb> nope
[19:07] <Laurenceb> if you look it uses integration bins
[19:07] <gordonjcp> ah righty
[19:08] <Laurenceb> 4 complex bins
[19:08] <Laurenceb> using c99
[19:08] <Laurenceb> http://www.gnu.org/s/libc/manual/html_node/Complex-Numbers.html
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[19:16] <Laurenceb> theres a delay locked loop to sync with the bits and fll to follow the carrier
[19:17] <Sparky68> jcoxon - planning going fine so far. Next stage is to test the RF modules, after that wire up an MCU to control the camera
[19:18] <jcoxon> great
[19:18] <Sparky68> If there is a launch on Sundcay I could try and see if I could pick it up
[19:18] <Sparky68> Sunday
[19:19] <jcoxon> i don't think they'll be a launch on sunday
[19:19] <Sparky68> :)
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[19:19] <Sparky68> oh
[19:19] <Sparky68> :(
[19:19] <jcoxon> the more i watch the weather it isn't as god
[19:19] <jcoxon> good*
[19:22] <jcoxon> Sparky68, has your radio arrived?
[19:24] <Sparky68> i am getting it tomorrow
[19:25] <jcoxon> cool
[19:25] <SpikeUK> If anyone has the option, I would like a launch of some kind the weekend after next please
[19:25] <jcoxon> Sparky68, where are you based?
[19:25] <Sparky68> Orpington, Kent
[19:26] <jcoxon> SpikeUK, hehe, i'm not sure i'll have anything ready
[19:27] <jcoxon> Sparky68, worth checking everything works by listening into the local repeater
[19:27] <Sparky68> yeah i'll do that
[19:27] <SpikeUK> jcoxon - shame! I'm doing a BarCamp in London and tracking a live launch would be so cool!
[19:27] <jcoxon> SpikeUK, but i'll watch the weather and persuade someone...
[19:27] <jcoxon> Sparky68, not too far from me
[19:29] <jcoxon> SpikeUK, which day?
[19:29] <Sparky68> cool
[19:29] <Sparky68> wtf
[19:30] <SpikeUK> jcoxon - Either! - That would be great. If it's feasible I'll contact the organizers and check that I can get and antenna outside. - BBL
[19:30] <jcoxon> SpikeUK, well it really depends on the weather
[19:31] <SpikeUK> jcoxon Absolutely - I'm totally flexible
[19:32] <jcoxon> who knows - someone might launch
[19:32] <jcoxon> :-p
[19:34] <SpikeUK> jcoxon - That would be great. I've got a plan a, a plan b, tracking a live launch during the event if really a plan c ;-) But if it came off, that would be excellent
[19:34] Sparky68 (n=Sparky68@bb-87-80-136-184.ukonline.co.uk) left irc:
[19:35] <jcoxon> hehe
[19:35] <jcoxon> indeed it would
[19:36] <jcoxon> shame i'm not ready for ballasthalo3 as a floater would be even better
[19:38] <jcoxon> longer flight time :-p
[19:41] <SpikeUK> jcoxon - not a problem. This BarCamp is having 20-min sessions, but if I've got live data being received on one laptop, and the tracker map on the other, I could set up in a communal area - potentially 250 interested geeks ;-)
[19:42] <jcoxon> hehe, yes
[19:43] <jcoxon> i think quite a few hackspace people will be attending
[19:43] <jcoxon> if i had a spare Atlas flight 'puter or the one in hte tree i would launch for you
[19:45] <SpikeUK> that's very kind. I do not want anyone to go to any expense or trouble...
[19:46] <jcoxon> oh but i don't hehe
[19:46] <jcoxon> the only pcb i've got left is on my desk being built :-
[19:46] <jcoxon> p
[19:46] <jcoxon> i'll see what i can do though - publicity is rarely bad
[19:47] <SpikeUK> ;-) I've ordered a Kaymont KCI-1500 from RocketBoy as a prop - I should get it in time
[19:48] <jcoxon> oh wow, thats a big balloon
[19:48] <jcoxon> !
[19:48] <jcoxon> http://www.9news.com/news/article.aspx?storyid=125161&catid=339#
[19:50] <jcoxon> SpikeUK, did you know that using rjharrison's tracker you can replay launches
[19:50] <SpikeUK> jcoxon - urm, no! How?
[19:51] <jcoxon> by changing the mission id
[19:51] <jcoxon> e.g.
[19:51] <jcoxon> http://www.robertharrison.org/tracker/map.php?height=1200&mission_id=97
[19:53] <jcoxon> e.g. ballasthalo 2
[19:53] <jcoxon> http://www.robertharrison.org/tracker/map.php?height=1200&mission_id=92
[19:53] <jcoxon> track 1 is the balloon, track 2 is rob driving to find it
[19:55] <SpikeUK> Oh. That's clever! I there a look-up chart of ID v launch? If not, I can make one
[19:58] <jcoxon> there isn't
[19:59] <jcoxon> but it would very well with the wiki list of launches - perhaps an additional column or instead of the kml bit
[19:59] <jcoxon> it doesn't go back that far
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[20:11] <natrium42> haha, did you guys see? http://www.thedenverchannel.com/news/21306839/detail.html
[20:11] <natrium42> Colorado Boy Floats Away In Balloon
[20:13] Sparky68 (n=antispam@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude.
[20:13] <Sparky68> back
[20:13] <natrium42> Sparky68: what not to do if you have kids --> http://www.thedenverchannel.com/news/21306839/detail.html
[20:15] <Sparky68> omg that is hilarious
[20:16] <natrium42> 7News confirmed the boy is the son of Richard and Naomi Heene appeared on an episode of ABC's "Wife Swap."
[20:16] <natrium42> this story is full of wtfs
[20:16] <Sparky68> lol
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[20:30] <rjharrison__> ping edmoore
[20:30] <Randomskk> think he is at the cuws meetup
[20:31] <SpeedEvil> jcoxon: did you see that bang goes the theroy?
[20:31] <Randomskk> actually met him today
[20:31] <rjharrison__> Randomskk cool
[20:31] <Randomskk> they have such a big antenna
[20:31] <Randomskk> jeez
[20:31] <rjharrison__> With a flux pen do you just rub the pads before soldering
[20:31] <Randomskk> yea
[20:31] <Randomskk> sometimes the part as well
[20:31] <Randomskk> most pens require you to push the tip in
[20:31] <Randomskk> to flow some liquid onto the tip
[20:31] <rjharrison__> Ok not used one before but thought I'd splash out
[20:31] <Randomskk> so push the tip against the board, then rub
[20:32] <rjharrison__> ok cool
[20:32] <Randomskk> then enjoy how much easier your life becomes
[20:32] <Randomskk> everything just flows into place
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[20:32] <malgar> hello
[20:32] <malgar> i'm following the one on the ballon
[20:32] <Laurenceb> wtf
[20:33] <Laurenceb> rule... 35 ?
[20:33] <Randomskk> hi Laurenceb
[20:33] <Randomskk> yea. 45.
[20:33] <Randomskk> 35* even
[20:33] <Randomskk> I got a great rule 35 photo actually
[20:33] <Laurenceb> theres always something crazy with balloons
[20:33] <Randomskk> in japan, some dude with a massive photography rig taking pictures of some temples, but his umbrella said RULE 35
[20:33] <Randomskk> and there were japanese girls in the vicinity so...
[20:34] <Randomskk> (are we talking about the same rule 35?)
[20:34] <Laurenceb> rule 34 I think
[20:34] <Randomskk> no, I know rule 34, 35 is "if it doesn't exist, make it"
[20:34] <Randomskk> hence the guy with the photography kit and RULE 35 umbrella
[20:35] <Laurenceb> http://encyclopediadramatica.com/Rules_Of_The_Internet <- obviously NSFW as its encyclopediadramatica
[20:35] <Laurenceb> http://images.encyclopediadramatica.com/images/3/30/1194679739296.jpg
[20:36] <Randomskk> close enough
[20:36] <Laurenceb> ok your probably right
[20:36] <Randomskk> tbh most of those rules are made up
[20:36] <Randomskk> the original missed a few numbers and large segments of it got lost
[20:36] <SpeedEvil> jcoxon: http://rapidshare.com/files/271499858/Bang_Goes_the_Theory_Series_1_-_Episode_4_b00m704v_default.mov.html TV with ukhaas.
[20:36] <Laurenceb> needs a rule on balloons
[20:37] <Randomskk> (or, really, 1 to 5 or so plus 34 were the originals, the rest are filling in spaces)
[20:38] <Laurenceb> you know way too much on this than is healthy
[20:38] <Randomskk> yea really
[20:39] <Randomskk> what disappoints me is that I'm yet to find anywhere else here who does too
[20:39] <Randomskk> they must exist but I'm not doing compsci so... :P
[20:39] <Randomskk> (that and you can never tell)
[20:40] <Randomskk> my shower buddy could be really into it and I woudln't know, it's just not something that comes up in casual conversation
[20:40] <Laurenceb> ....
[20:40] <Laurenceb> shower buddy
[20:40] Action: Laurenceb doesnt like where this is going
[20:40] <Randomskk> I need to explain that term more
[20:40] <Randomskk> one shower between every two rooms at my current accommodation
[20:40] <Laurenceb> ah ok
[20:40] <Randomskk> hence, the person in the room next to me is my shower buddy
[20:41] <Randomskk> doesn't involve sharing the shower, fortunately
[20:41] <Randomskk> I mean, not at the same time.
[20:41] <Laurenceb> lol oj
[20:41] <Laurenceb> *ok
[20:42] <Randomskk> but yea
[20:42] <Randomskk> I should drop some hints and see if anyone picks up on them
[20:42] <Randomskk> to be honest though, I think I'd rather not know
[20:42] <Laurenceb> http://news.bbc.co.uk/1/hi/world/americas/8309818.stm
[20:42] <Randomskk> lool what
[20:53] <Laurenceb> They need to do way instain father> who took baloon. because these baloon can't frigth back? my pary and with the mother who lost her chrilden; I am truely sorry for your lots.
[20:54] <SpeedEvil> it's gotta be a damn huge airship if it can lift a 6yo
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[20:57] <Laurenceb> And the only thing found inside the balloon was a picture of Rick Astley.
[20:58] <sbasuita> "US runaway balloon lands in field"
[20:58] <sbasuita> Whoa, that sounds like a must-read article!
[20:58] <SpeedEvil> I can't find any sizes
[20:59] <jcoxon> hey SpeedEvil
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[20:59] <SpeedEvil> h
[20:59] <jcoxon> there is a copy on youtube of the balloon parts of the episode
[20:59] <SpeedEvil> yeah - that's the whole ep
[20:59] <SpeedEvil> I just uploaded it from iplayer
[21:00] <jcoxon> oh cool
[21:02] <jcoxon> will download it
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[21:08] <sbasuita> DanielRichman, do payload tests
[21:08] <DanielRichman> sbasuita, now? they can't run overnight... can they?
[21:09] <DanielRichman> actually that might work
[21:09] <DanielRichman> i don't fancy a camera flash going off every 20 seconds while I try to sleep
[21:09] <DanielRichman> i'll go get a box and put it all downstaris
[21:09] <SpeedEvil> Camera flashes have a limited life
[21:10] <sbasuita> DanielRichman, configure the camera first
[21:10] <sbasuita> DanielRichman, autofocus off
[21:10] <sbasuita> DanielRichman, flash off
[21:10] <sbasuita> DanielRichman, etc
[21:10] <DanielRichman> right
[21:10] <DanielRichman> it clicks when it takes a photo
[21:10] <DanielRichman> so it's still going downstairs
[21:10] <sbasuita> DanielRichman, you still need to do that
[21:10] <DanielRichman> naturally
[21:11] <DanielRichman> I will keep the gps antenna inside its antistatic bag (yet plugged in) and won't attach the phone
[21:11] <DanielRichman> sbasuita, is that ok?
[21:11] <sbasuita> DanielRichman, why?
[21:11] <DanielRichman> it wont get signal anyway and i don't have the credit to run 6ish hours of smsing
[21:12] <DanielRichman> it's 12/hr
[21:12] <DanielRichman> that's £1.44/hr
[21:12] <DanielRichman> could be worse
[21:12] <DanielRichman> could set it up tomorrow and have it constantly text me during the day
[21:12] <Randomskk> that would get so annoying :P
[21:12] <DanielRichman> I can always turn my phone off - it usually is
[21:13] <Randomskk> fair enough
[21:13] <DanielRichman> besides it won't last into second period
[21:13] <Randomskk> lol turning your phone on after would be fun though
[21:13] <DanielRichman> haha
[21:13] <DanielRichman> 72 texts
[21:13] <DanielRichman> om nom nom
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[21:14] <DanielRichman> sbasuita, the sd card will be in there anyway...
[21:14] <jcoxon> wow i hate this usb-serial convertor
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[21:18] <DanielRichman> sbasuita,
[21:18] <DanielRichman> <DanielRichman> sbasuita, the sd card will be in there anyway...
[21:18] <DanielRichman> sbasuita, I think i will go top up this sim card
[21:18] <DanielRichman> then start it tomorrow
[21:18] <DanielRichman> then enjoy my texts
[21:18] <Laurenceb> hmm
[21:19] <Laurenceb> I'm not sure if that balloon was even big enough to lift a boy
[21:19] <DanielRichman> quel balloon?
[21:19] <Laurenceb> http://news.bbc.co.uk/1/hi/world/americas/8309818.stm
[21:20] <jcoxon> Laurenceb, yeah there is a debate on a GPSL balloon lift on the max lift on the balloon
[21:20] <Laurenceb> I guesstimate 19kg
[21:20] <Laurenceb> the boy would be at last 15
[21:20] <Laurenceb> so its very very borderline
[21:20] <DanielRichman> Killer title: US runaway balloon lands in field
[21:22] <DanielRichman> sbasuita, I'm worried about the phone's battery life
[21:23] <sbasuita> DanielRichman, er charge it up
[21:23] <DanielRichman> sbasuita, obviously, i'm worried about how long it lasts
[21:23] <sbasuita> DanielRichman, well you better find out¬
[21:24] <DanielRichman> you realise that when it's in the air it boosts tx power to the max and so drains faster
[21:24] <DanielRichman> to properly test it should put it in a microwave for 4 hours then ask it to send texts
[21:24] <sbasuita> DanielRichman, have you got a source for that?
[21:25] <DanielRichman> sbasuita, source for what? Microwaves are shielded and block mobile phone signals
[21:25] <DanielRichman> attributed to my physics teacher, naturally
[21:25] <DanielRichman> oh and i tested it with my dad's phone for jokes
[21:25] <DanielRichman> sbasuita, is it a huge loss if I don't test the phone's 5hour texting ability?
[21:26] <sbasuita> DanielRichman, no a source for max tx when no signal
[21:26] <DanielRichman> oh yeah, i can't give it to you but I know that for sure
[21:26] <DanielRichman> well
[21:26] <sbasuita> DanielRichman, ...
[21:26] <DanielRichman> it goes to max tx power when there is very little signal
[21:26] <DanielRichman> to reach the base station
[21:26] <jcoxon> wow
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[21:26] <DanielRichman> i don't know what it does at max
[21:26] <jcoxon> just had a cool thought
[21:27] <jcoxon> do you guys remember ballasthalo1
[21:27] <DanielRichman> *does at no signal
[21:27] <sbasuita> DanielRichman, surely it would stop after a few mins
[21:27] <DanielRichman> sbasuita, mebe, mebe not
[21:27] <jcoxon> where the altitude field overflowed and so we never new the max alt
[21:27] <DanielRichman> Oh yes, I remember
[21:27] <DanielRichman> nice one ;)
[21:27] <sbasuita> pretty cool
[21:27] <jcoxon> well i'm running my fake gps
[21:27] <jcoxon> and so am able to emulate it
[21:28] <jcoxon> so if i now go back and find out what the max value was
[21:28] <jcoxon> ...
[21:28] <DanielRichman> suurely you could track down the bug and just work it out logically?
[21:28] <DanielRichman> 'cause you gotta squash that bug anyway?
[21:28] <jcoxon> oh i've squished it already
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[21:28] <DanielRichman> jcoxon, so can't you reverse-engineer the real max alt?
[21:28] <jcoxon> on a future copy
[21:29] <jcoxon> this is quicker then working out the logic
[21:29] <DanielRichman> you could copy the misbehaving-relevant c to a small .c file and bruteforce
[21:29] <DanielRichman> won't take long
[21:29] <jcoxon> or just use my fake gps
[21:29] <DanielRichman> pssh
[21:30] <jcoxon> just got to find that old max alt
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[21:33] <jcoxon> 35678m
[21:34] <DanielRichman> nice
[21:37] <jcoxon> let me check that
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[21:39] <jcoxon> might be a bit more actually
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[21:44] <Jon_Apex> evening
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[21:46] <edmoore> hi mathen
[21:46] <jcoxon> DanielRichman, hmmm actually it doesn't work
[21:46] <matthen> hey Ed, tis Matt
[21:46] <edmoore> i guessed
[21:47] <edmoore> rjharrison__: you called
[21:47] <edmoore> sorry was busy at the time
[21:47] <matthen> sent an email to martin btdubs
[21:48] <edmoore> cool
[21:48] <edmoore> have you seen his website (google his callsign)
[21:48] <edmoore> slightly misleading photo
[21:49] <edmoore> jcoxon: 37
[21:49] <matthen> yeah for sure i have- lol all old people with websites use younger photos
[21:49] <matthen> e.g. dr tout
[21:49] <jcoxon> hey edmoore
[21:49] <jcoxon> hehe
[21:50] <edmoore> matthen: that's a hell of a photo
[21:50] <matthen> ed: it makes me smile when i'm feeling down
[21:53] <edmoore> it wasn't so long ago there were 5 people on this channel.
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[21:54] <jcoxon> edmoore, 38!
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[21:54] <edmoore> how sweet it was, for 4 seconds
[21:56] <jcoxon> edmoore, good meeting?
[21:56] <edmoore> yeah I think so. lots of people, lots of pizza
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[21:56] <edmoore> i'm sure it'll settle to a more manageable number
[21:56] <jcoxon> cusf?
[21:56] <edmoore> yep
[21:57] <jcoxon> great
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[21:58] <matthen> ah
[21:58] <edmoore> whoops
[21:59] <DanielRichman> sbasuita, i've topped up the sim, and will set it up tomorrow morning
[22:00] <Jon_Apex> cheers for the pizza :)
[22:00] <SpeedEvil> Sending yourself messages may be free or cheap
[22:01] <edmoore> np
[22:02] <DanielRichman> Considering I'm voltage-regulating to 5-volts, if i increase the supply voltage will the amps at the battery decrease or will more heat simply be burned off the regulator?
[22:03] <SpeedEvil> linear - no, SMPS yes
[22:03] <DanielRichman> I expect i have a linear one; which bit does the "no" refer to, SpeedEvil ?
[22:04] <SpeedEvil> a linear reg is a variable resistor
[22:04] <SpeedEvil> basically
[22:04] <edmoore> the greater the drop across the linear, the more heat you generate. current remains constant.
[22:04] <SpeedEvil> it's in series with the circuit, and current in a series circuit is the same
[22:04] <DanielRichman> ahh; damn
[22:05] <DanielRichman> I'm worried about the voltage dropping too low as the batteries discharge and thus the gps browning out
[22:05] <edmoore> just make them batts biggish
[22:05] <DanielRichman> biggish in which direction?
[22:06] <edmoore> capacity
[22:06] <edmoore> look at how much current you need, figure out how much energy you'll need for an 8 hour flight, and pick batteries with about 3 times that
[22:07] <DanielRichman> iirc it's ~120mA... so 1Ah for a 8hour flight... these batteries have 2000 mAh IIRC
[22:07] <DanielRichman> but it won't be 8 hours
[22:08] <edmoore> it will be between turning it on, realising you don't have a spanner for the regulator, going to the loo, trying to find your audio hook-up cable, wondering why it's taking so long to lock, fly, and spend 4 hours trying to find it
[22:08] <DanielRichman> true ;P
[22:08] <edmoore> trust me on this'n
[22:09] <edmoore> 'turn on and go' is a bit of a myth :)
[22:09] <matthen> dont forget about foreplay
[22:10] <jcoxon> hehe i love turn on and go
[22:10] <jcoxon> i'm such a sucker for that myth
[22:12] <edmoore> i think we only managed it twice, and that was using basically identical flight software to the first time
[22:12] <edmoore> the thing is we never fly the same thing twice, and that's probably a good thing, but it does mean it's always a bit last-minute
[22:13] <jcoxon> what happened with ballasthalo 2
[22:13] <jcoxon> did we fly that straight
[22:13] <jcoxon> I/we dropped 1 out the window
[22:13] <edmoore> actually that was a nice flight wasn't it
[22:13] <edmoore> i think
[22:14] <edmoore> although wasn't there the odd gps lock hickup?
[22:14] <edmoore> that still makes me laugh
[22:14] <DanielRichman> sbasuita, how do I focus on infinity? Might have to change the mode - which we can't since we dismantled the groovy-looking set of contacts on the top
[22:14] <jcoxon> yes
[22:14] <jcoxon> indeed there was
[22:14] <jcoxon> oh and then it died ;-)
[22:14] <edmoore> it was all going so well, something had to happen, but i didn't imagine it would be you throwing you payload accidently out of a 2nd floor window
[22:15] <jcoxon> haha
[22:15] <jcoxon> so very funny
[22:15] <jcoxon> oh well that bad boy probably broke the alt record and then floated for 7hrs
[22:16] <jcoxon> and is still stuck in that tree :-)
[22:16] <jcoxon> well i've got its twin working infront of me
[22:17] <jcoxon> oh edmoore
[22:17] <edmoore> oh, junderwood had a loom for it but could not see it
[22:17] <edmoore> could only see some string
[22:17] <edmoore> he thought someone might have had it
[22:17] <edmoore> look*
[22:17] <jcoxon> oh maybe its been stolen
[22:17] <jcoxon> shame the gps module was quite nice
[22:17] <jcoxon> rjharrison__, might pop round soon to see if its still there
[22:17] <DanielRichman> of all the things you would steal...
[22:18] <jcoxon> edmoore, spikeuk is doing the barcamp talk next weekend and was wondering if anyone was launching
[22:18] <edmoore> i don't think we are
[22:19] <edmoore> not sure if anyone else is either
[22:19] <jcoxon> i'm not
[22:19] <jcoxon> maybe rob
[22:19] <edmoore> depends on how the soldering goes, i guess
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[22:32] <natrium42> "The balloon landed about 2 miles northeast of Prospect Reservoir at 1:35 p.m., in Weld County, but the boy was not inside. That's about 50 miles from where the balloon lifted off."
[22:32] <natrium42> :(
[22:32] <natrium42> http://www.thedenverchannel.com/news/21306839/detail.html
[22:33] <edmoore> i just watched that on the bbc
[22:33] <edmoore> just look at the size of it and do some napkin calculations
[22:33] <edmoore> there is no way that thing could lift a 6 year old child
[22:33] <edmoore> he was never on board
[22:33] <edmoore> i reckon he just let it go and then hid somewhere for fear of being told off
[22:34] <natrium42> hmm, let's hope so
[22:36] <edmoore> well, it can't be that it lifted him. unless he is outside 3-sigma-low for the mass of a six year old
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[22:48] <edmoore> h'ok, see y'all tomorrow
[22:48] <matthen> bye
[22:50] <SpeedEvil> wave
[22:50] <edmoore> actually am here for a min or two
[22:50] <edmoore> just reading about particle filtering
[22:51] <matthen> nice
[22:54] Action: SpeedEvil is reading about MIR again. Fun.
[22:54] <SpeedEvil> MRI
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[23:16] <natrium42> little boy found hiding in the garage...
[23:16] <Sparky68_> little twat
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[23:18] <natrium42> XD
[23:18] <jcoxon> hehe
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[23:19] Nick change: Sparky68_ -> Sparky68
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[23:43] <rjharrison__> Hi Randomskk
[23:43] <rjharrison__> hi RocketBoy
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[23:56] <RocketBoy> nights
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[00:00] --- Fri Oct 16 2009