highaltitude.log.20110607

[00:01] <SpeedEvil> Can someone remind me of the open-radio project - for SDR
[00:02] <SpeedEvil> ah - nvm gnuradio
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[00:38] <Hibby> hmm
[00:39] <Hibby> what do we think the UKube antennas should be
[00:39] <Hibby> gotta build some test ones tomorrow
[00:39] <Hibby> not really thought about it
[00:39] <Darkside> cross dipoles
[00:40] <Hibby> not got the space
[00:40] <Hibby> it'll need to be an axial mode helix or monopole
[00:40] <Hibby> gotta fit 2m, 70cm and the S-Band patch in
[00:40] <Darkside> oh
[00:40] <Hibby> I'm just dealing with the UV stuff
[00:41] <Darkside> well a cross dipole would be circular polarised
[00:41] <Hibby> indeed. But how does one fit that on a floating beercan
[00:41] <Hibby> never mind two of them
[00:41] <Darkside> heh
[00:43] <Hibby> was thinking spring steel antennas, as they need to be deployed in space too
[00:44] <Hibby> the space segment antennas themselves don't need to be circularly polarized, which makes life easier
[00:44] <Hibby> probably just whack for wire monopoles then
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[08:46] <cuddykid> anyone want me to add their iOS devices to my dev account so you can get iOS 5 Beta? Just PM me if you do :)
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[10:17] <GW8RAK> Morning. Have just received an email detailing GPS jamming exercises in East Anglia in September and October.
[10:17] <GW8RAK> Could be significant if anyone wants to launch then.
[10:18] <GW8RAK> *Subject:* Ofcom Update: Notification of GPS jamming exercises
[10:18] <GW8RAK> STANFORD TRAINING AREA, EAST ANGLIA, SEPTEMBER AND OCTOBER 2011
[10:18] <GW8RAK> Dates: Between 19 and 23 September 2011 and between 03 and 07 October 2011
[10:18] <GW8RAK> inclusive.
[10:18] <GW8RAK> Times: 0900 -1730 BST.
[10:18] <GW8RAK> Location of MULTIPLE jammers: Land based within 5km of N52ý 31.0ý E000ý
[10:18] <GW8RAK> 45.0ý.
[10:18] <GW8RAK> Frequency: A 24 MHz band centred around 1575.42MHz (GPS L1).
[10:18] <GW8RAK> Total Power: Up to 10 Watts EIRP.
[10:18] <GW8RAK> It is stressed that, as in previous exercises, Safety of Life operations
[10:18] <GW8RAK> will at all times take precedence over exercise activities.
[10:18] <GW8RAK> Ofcom stakeholders should contact InfoGPS.Notices@ofcom.org.uk
[10:25] <eroomde> hmm
[10:25] <eroomde> thanks for the headsup
[10:26] <GW8RAK> I wonder if they'll use directional jammers and keep the jamming to low level, if that is possible?
[10:30] <Laurenceb> interesting
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[10:41] <Laurenceb> hmm bmp085 is working
[10:41] <Laurenceb> pressure seems to be ~300Pa out
[10:43] <eroomde> i'd be interested to know how their jammers work
[10:43] <eroomde> whether it's just more noose or spoof sattelites or something
[10:44] <eroomde> noise*
[10:44] <Laurenceb> which is out of spec... it goes down to <100pa if i assume my local weather station used gps altitude
[10:45] <Laurenceb> eroomde: aiui they usually use guassian noise
[10:45] <Laurenceb> as the mil signal is really hard to spoof
[10:45] <eroomde> what protocol does the mil signal use?
[10:47] <Laurenceb> its a massively long prn code
[10:47] <Laurenceb> as in ~never repeats
[10:48] <Laurenceb> you need the L1 code to get starting position unless you initialise off an imu
[10:48] <eroomde> so how does the receiver know what to look for?
[10:49] <Laurenceb> then you have an algorithm for generating the mil code at integer weeks
[10:49] <Laurenceb> and you run forward to the present time in the week
[10:50] <eroomde> presumably a secret algorithm?
[10:50] <Laurenceb> yes
[10:50] <eroomde> uhuh
[10:50] <Laurenceb> but the main secret is the config settings
[10:51] <Laurenceb> theres a few KB of initialisation data you need to make it work
[10:51] <Laurenceb> similar with galileo, only the mil algorithm is open there
[10:51] <Laurenceb> in fact atm the mil config file is open
[10:52] <Laurenceb> when they switch to the mil code, they enable a new code onboard the sats
[10:52] <Laurenceb> its loaded off an i2c eeprom aiui :P
[10:52] <eroomde> hmm
[10:52] <eroomde> neat
[10:53] <Laurenceb> eeproms having been delivered in high security from esa headquarters to sat assembly building
[10:53] <Laurenceb> there are techniques for tracking the bit edges on the mil code
[10:53] <Laurenceb> that can help with ionospheric removal
[10:54] <Laurenceb> but egnos/waas is preffered for consumer stuff as you only need single frequency rf front end
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[11:24] <SpeedEvil> Laurenceb: You can get the mil code directly, without resorting to anything, though it does involve a ~30m dish
[11:26] <Elwell> might be a bit too much frag for HAB then
[11:26] <Elwell> drag
[11:29] Nick change: zz_BrainDamage -> BrainDamage
[11:30] <Laurenceb> this pressure offset is odd
[11:30] <Laurenceb> seems to be a definite 350Pa offset
[11:34] <SpeedEvil> Soldering?
[11:34] <SpeedEvil> That is - stresses induced in soldering can cause shifts.
[11:35] <Laurenceb> oh yeah
[11:35] <Laurenceb> thats a seperate row in the datasheet
[11:35] <Laurenceb> thought it was included
[11:35] <SpeedEvil> Sometimes they spec 'relaxation' time or something
[11:35] <SpeedEvil> which is time to get back to nominal baseline after soldering
[11:36] <Laurenceb> yeah, they say +-100Pa for soldering
[11:36] <Laurenceb> and +-100Pa per year after factory cal
[11:36] <Laurenceb> and +-250Pa at room temperature, so at least 450Pa error
[11:37] <Laurenceb> and my soldering is probably worse... ok that probably explains it all
[11:42] <SpeedEvil> :)
[12:12] <Laurenceb> of course the pressure in my house way be weird
[12:12] <Laurenceb> window was open tho
[12:13] <SpeedEvil> Umm - unless the wind is mach 3, the pressure inside and outside won't be much different
[12:13] <Laurenceb> well... extractor fans etc
[12:14] <BrainDamage> maybe there's a ramjet motor test next to his window
[12:22] <Laurenceb> hmm yeah 'relaxation' time is interesting
[12:22] <Laurenceb> i was looking at solde rjoints under a scope, if you cool too quickly theres often hairline cracks
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[12:40] <Laurenceb> how do you join #electronics?
[12:40] <Laurenceb> i always get overflow for past few weeks
[12:41] <SpeedEvil> you may need to have your nick registered
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[12:41] <Laurenceb> ah
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[12:42] <Laurenceb> how do you join #electronics?
[12:42] <Laurenceb> oops
[12:42] <DanielRichman> you don't, you join ##electronics apparently
[12:43] <SpeedEvil> yeah - you last logged in a couple of weeks ago
[12:44] Action: DanielRichman reads logs - misunderstood
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[13:18] <Hibby> Clyde Space has a pretty sweet office
[13:18] <Hibby> space invaders themed :)
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[13:33] <Dan-K2VOL> Morning
[13:35] <Hibby> hola
[13:36] <Hibby> http://www.flickr.com/photos/djhibby/5808420740/in/photostream <== she's a thing of beauty, eh?
[13:37] <staylo> It's certainly the most overengineered CD rack I've ever seen :)
[13:37] <Dan-K2VOL> Is that a triple cubesat?
[13:37] <Dan-K2VOL> Hibby
[13:38] <Hibby> yep
[13:39] <Dan-K2VOL> What it going to do? There's a lot of boards in there
[13:39] <Hibby> it's UKube 1 - we've got a funcube trx, a separate telem trx, a few experiments, some power systems research
[13:41] <Dan-K2VOL> that's a lot o money there
[13:41] <Dan-K2VOL> Who's footing the bill
[13:41] <Hibby> UK Space Agency
[13:41] <Dan-K2VOL> oh really, nice!
[13:41] <Hibby> Clyde Space, to some extent.
[13:41] <Hibby> and I think EADS Astruim too
[13:42] <Dan-K2VOL> Huh a lot of people eh
[13:42] <Hibby> pretty big project
[13:43] <Hibby> clyde space like me ~ I'm rapidly becoming their RF expert
[13:43] <Hibby> 'expert'
[13:45] <Dan-K2VOL> really hibby
[13:45] <Dan-K2VOL> so you must know QFH antennas well ;-)
[13:45] <Hibby> quad helices?
[13:45] <Hibby> I'm more into my axial mode helices
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[13:46] <Hibby> actually, I've got the book on helices right here
[13:47] <Hibby> by John d Kraus, their inventor.
[13:48] <Dan-K2VOL> Hrm
[13:48] <Dan-K2VOL> Interesting, we're still working on that quad helix for ORBCOMM
[13:49] <Hibby> for your ground seg or both?
[13:49] <Dan-K2VOL> for the balloon
[13:49] <Hibby> ah, cool
[13:49] <Hibby> pretty ideal radiation pattern
[13:49] <Dan-K2VOL> ORBCOMM has a tx-rx pair of 137MHz and 149MHz, which is not easy to make a quad helix cover it seems
[13:50] <Hibby> could always make two, for all it'd cost :p. Fair enough, transport won't be ideal...
[13:52] <Hibby> sadly there's not much in here about widening the band of a normal mode helix
[13:54] <Hibby> or are you looking at multi lobed modes?
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[14:18] <fsphil> Hibby, has it got a camera?
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[14:20] <Elwell> fsphil: bearing in mind 1) its in glasgow and 2) Hibby (a student) was within reach of it, its safe to say 'not anymore'
[14:22] <Hibby> fsphil: it likely will, aye
[14:22] <Hibby> I think it depends on just how fast we get the sband downlink
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[14:25] <fsphil> sweeet
[14:25] <fsphil> I'm of the opinion that all satellites should have at least one camera :)
[14:26] <Hibby> there was talk of changable non-visible light filters
[14:26] <Hibby> to do "science" with
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[14:29] <eroomde> Dan-K2VOL: s'up?
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[14:31] <fsphil> man we're being pounded by hail today -- been falling now for about 30 minutes
[14:31] <fsphil> my poor payload :)
[14:36] <eroomde> is it outside?
[14:37] <eroomde> ah, just looked at tracker
[14:37] <eroomde> up a tree?
[14:37] <SpeedEvil> Another tree?
[14:38] <SpeedEvil> Ah - same tree - tracker
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[14:39] <SpeedEvil> yes, it edned up a tree - it was found, but not recovered yet.
[14:39] <Dan-K2VOL> Hi eroomde
[14:39] <eroomde> wretched yellow on white irssi theme, can't see whenever anyone mentions my name
[14:39] <eroomde> so excuse me for sounding like a confused old man, but who's that saying my name?
[14:40] <SpeedEvil> Dan-K2VOL it wa
[14:40] <eroomde> ah thanks
[14:40] <eroomde> hi Dan-K2VOL
[14:41] <Dan-K2VOL> Haha ok I won't say it
[14:41] <eroomde> i should change t'theme
[14:44] <natrium42> yo
[14:45] <W0OTM> Hello World
[14:45] <Laurenceb> dawg
[14:46] <fsphil> woof
[14:46] <natrium42> sup homies
[14:50] <eroomde> food poisening
[14:50] <eroomde> can't go into work
[14:50] <natrium42> :S
[14:50] <Laurenceb> :-/
[14:50] <eroomde> reduced to small bouts of washing up and watching iplayer/irc between loo visits
[14:50] <eroomde> happy days
[14:53] <natrium42> eroomde: did you watch sjobs keynote?
[14:53] <eroomde> nope?
[14:54] <eroomde> did i miss anything cool?
[14:54] <natrium42> not much, lion, ios5 and cloud services
[14:54] <natrium42> it was pretty disappoint
[14:55] <eroomde> i saw lion could do fullscreen, full colour terminal
[14:55] <eroomde> that might justify the upgrade, just about
[14:55] <eroomde> but i've sort of already jumped ship to linux
[14:55] <eroomde> poor old creaky mbp just does iphone updates
[14:56] <natrium42> hehe
[14:56] <natrium42> is it the core 2 duo one?
[14:57] <eroomde> yep
[14:57] <eroomde> core duo*
[14:57] <eroomde> no 2
[14:57] <eroomde> so older still
[14:57] <natrium42> ah, i have the non-unibody 17"
[14:57] <natrium42> but it's core 2 duo
[14:57] <eroomde> i think an ssd would make it like new tbh
[14:57] <natrium42> dunno, still pretty decent
[14:57] <natrium42> no real need to upgrade
[14:57] <eroomde> it's always the 120gig hdd whirring away for twnety minutes when things pause
[14:58] <natrium42> yeah, the new macbook airs are pretty damn fast because of their ssds
[14:58] <eroomde> so it my new pc :)
[14:58] <natrium42> :)
[14:58] <eroomde> even the jvm is up in like 0.1s
[14:58] <eroomde> makes eclipse tolerable
[14:59] Nick change: BrainDamage -> zz_BrainDamage
[14:59] <natrium42> need to replace battery... got some chinese clone, but it's very bad
[14:59] <natrium42> 2 hours max
[14:59] <eroomde> same for me
[14:59] <eroomde> 1hr really
[14:59] <natrium42> maybe they put some used cells in...
[14:59] <natrium42> new one is $130
[14:59] <natrium42> genuine apple
[14:59] <natrium42> no more chinese crap
[15:00] <natrium42> hhahahahahahaha
[15:00] <natrium42> iOS 5 jailbroken already
[15:00] <natrium42> :D
[15:00] Nick change: zz_BrainDamage -> BrainDamage
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[15:29] <Laurenceb> /join #apple guys
[15:30] <Dan-K2VOL> lol
[15:31] <natrium42> you will /join us or die
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[15:37] <Laurenceb> or run linux
[15:38] <natrium42> i am triple booting!
[15:38] <Laurenceb> last three versions of OSX ?
[15:38] <natrium42> lol
[15:39] <natrium42> osx, ubuntu and win7
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[15:55] <Laurenceb> http://bin.jvnv.net/f/yQbYr.png
[15:55] <Laurenceb> nice - thats why the state machine + hardware buffer i2c on stm32 is neat
[15:56] <Laurenceb> it just clks continuously - no need to re setup the hardware
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[16:17] <SpeedEvil> http://funnyzela.com/wp-content/gallery/10demotivational/demotivational-0005.jpg
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[16:30] Action: Laurenceb is reading the chibios docs
[16:30] <Laurenceb> looks really really nice.. maybe ive been wasting my time :-/
[16:32] <eroomde> i think i might play with it too - everyone says good things
[16:32] <Laurenceb> guess im not convinced i need an rtos
[16:32] <jonsowman> no more thermodynamics!
[16:32] <eroomde> well done jonsowman!
[16:32] <eroomde> how did it go?
[16:32] <SpeedEvil> jonsowman: :)
[16:32] <eroomde> that was the worst exam of my life
[16:32] <eroomde> so far, anyway
[16:32] <Laurenceb> only problem is if i want to add _anything_ else task wise i need a rtos really
[16:32] <Laurenceb> thermo is fun XD
[16:32] <jonsowman> surprisingly not as bad as I was expecting
[16:32] <BrainDamage> I hate thermodynamics :/
[16:33] <jonsowman> the exams have generally been alright thus far
[16:33] <jonsowman> not exceptional in either sense, but ok :)
[16:33] <SpeedEvil> I was trying to work out optimal refrigerants the other day, and maximal coefficients of performance.
[16:33] <SpeedEvil> But my brain melted.
[16:33] <eroomde> gosh, that 2008 thermodynamics still gives me nightmares
[16:33] <eroomde> to the point of writing an apology note to the examiner
[16:34] <jonsowman> yeah that was a horrible paper, I did it as a mock
[16:37] <eroomde> still, not like i ever needed it
[16:37] <eroomde> like i'm about to start at a company that does fluid-structure interation for supersonic parachutes :|
[16:38] <jonsowman> hehe
[16:38] <SpeedEvil> What possible application could thermodynamics have for that? :)
[16:38] <eroomde> i know right
[16:38] <eroomde> just stick it in a wind tunnel and see
[16:39] <jonsowman> :D
[16:40] <eroomde> jonsowman: Randomskk around?
[16:40] <jonsowman> yes afaik
[16:40] <eroomde> well, he's pinged anyhoo
[16:40] <eroomde> well you might know - what jtag does he use for stm32 stuff?
[16:40] <jonsowman> I don't know sorry
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[16:40] <eroomde> I want to play but don't want to use the non-open one i have currently
[16:41] <eroomde> i.e. give crossworks the hump
[16:41] <jonsowman> ah I see
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[16:45] <Randomskk> eroomde: kinda
[16:45] <Randomskk> I use openocd on the computer
[16:45] <Randomskk> and as a hardware device I use arm-usb-tiny from olimex
[16:45] <Randomskk> but I mostly avoid using it where possible as the stm32's serial bootloader is much happier
[16:46] <eroomde> cool, the one sparkfun have sold for ages?
[16:46] <Randomskk> yea
[16:46] <Randomskk> their cheapest usb one, just has a usb port and a 10x2 header
[16:46] <Randomskk> any jtag will work though, you can use a parallel port and some wires
[16:46] <Randomskk> https://github.com/adamgreig/STM32_SkeletonProject has openocd profiles for loading code
[16:46] <Randomskk> along with everything else
[16:46] <eroomde> ta
[16:46] <Randomskk> but yea, personally I find the serial bootloader 100x easier. otoh I suck and don't debug properly
[16:46] <Randomskk> so there's that
[16:46] <Randomskk> gotta run, dinner, bbl
[16:51] <SamSilver> bbl
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[17:17] <jcoxon> afternoon
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[17:18] <eroomde> good afternoon jcoxon
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[17:28] <jcoxon> hey eroomde
[17:28] <jcoxon> hows tricks?
[17:29] <eroomde> all well and good
[17:29] <eroomde> i have a job
[17:29] <jcoxon> excellent
[17:29] <jcoxon> awesome
[17:30] <jcoxon> haha gps jamming at stanford
[17:30] <jcoxon> i know that area well
[17:30] <jcoxon> very well
[17:30] <eroomde> :)
[17:30] <eroomde> it's a counter-measure
[17:31] <jcoxon> yeah
[17:31] <jcoxon> must be
[17:31] <jcoxon> guess we'd of never found it
[17:32] <eroomde> perhaps that's why they're trying it!
[17:33] <jcoxon> time to play with an SPI realtime clock
[17:33] <jcoxon> after some toast
[17:34] <eroomde> that's what they all say
[17:44] <fsphil> a toast break
[17:44] <fsphil> nice
[17:45] <fsphil> [ot] more amazing volcano pics: http://www.theatlantic.com/infocus/2011/06/chiles-puyehue-volcano-erupts/100081/
[17:53] <jcoxon> very cool
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[18:41] <jcoxon> ping fsphil
[18:41] <fsphil> pong jcoxon
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[19:01] Nick change: [STAR]Atanyi|Wor -> Upu
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[19:17] <natrium42> Dan-K2VOL: did you see http://www.engadget.com/2011/06/07/delormes-inreach-two-way-gps-communicator-receives-txts-on-moun/
[19:17] <natrium42> ?
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[19:22] <akaGoose> Hey
[19:23] <akaGoose> What balloons are you guys using in your launches and where do you get them from?
[19:24] <akaGoose> Ukhas.org seems to be a bit out of date..
[19:26] <sbasuita> akaGoose: http://randomsolutions.co.uk/Random_Aerospace/Balloons.html
[19:26] <sbasuita> akaGoose: the source of uk balloons for as long as i've been here
[19:26] <jcoxon> akaGoose, its not out of date
[19:26] <jcoxon> not many big news items on the front page
[19:26] <jcoxon> but the rest is up todate
[19:27] <natrium42> jcoxon: did you see link above?
[19:28] <natrium42> it's very good news for balloon tracking :)
[19:28] <natrium42> especially long duration
[19:28] <jcoxon> wow
[19:28] <jcoxon> yeah, prices are reasonabl
[19:28] <jcoxon> e
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[19:37] <akaGoose> Thanks sbasuita
[19:38] <akaGoose> Also to get a feel of how a launch goes I was hoping that I could attend one prior to doing our own..
[19:39] <akaGoose> What's the best was to make this possible?
[19:39] <akaGoose> Monitor the jihad google groups for launches?
[19:39] <akaGoose> Ukhas not jihad!
[19:39] <Upu> lol
[19:39] <akaGoose> Lol
[19:40] <sbasuita> what the
[19:40] <Upu> no you don't want to go to a "jihad" one you may not come back
[19:40] <BrainDamage> same thing, really
[19:40] <akaGoose> I'll try not to bring forth a jihad on the launch I promise!
[19:41] <Upu> there are a number of launches coming up
[19:41] <Upu> where are you based ?
[19:41] <akaGoose> Bristol
[19:41] <akaGoose> Willing to travel as long as it's not too far
[19:41] <Upu> Cambridge is probably your best bet
[19:41] <fsphil> so not hadie:4 then :) (n.ireland)
[19:42] <akaGoose> Hah no not n Ireland!
[19:42] <Upu> still 3 hours drive to Cambridge
[19:42] <akaGoose> Cambridge isn't that far is ita.
[19:42] <Upu> yep
[19:43] <akaGoose> Ahh balls
[19:43] <akaGoose> Is that where the ukhas have a launch site?
[19:44] <Upu> no not an official one
[19:44] <Upu> but alot of launches go from that area
[19:44] <akaGoose> Ok
[19:44] <Upu> as a loose collection of people "UKHAS" doesn't have an official anything I think :)
[19:44] <fsphil> you can launch in most places but you gotta fill in the caa paperwork
[19:44] <fsphil> and wait a month+
[19:44] <akaGoose> I heard there's someone who
[19:45] <akaGoose> Who's from Cardiff who launches?
[19:45] <fsphil> nobody yet, but nigeys is planning one
[19:45] <Upu> Cambridge Uni and Steve (Rocketboy)
[19:45] <jcoxon> Upu, we have a wiki :-p
[19:46] <Upu> we do indeed :)
[19:47] <akaGoose> Well I've got my boss to agree to sponsor a project and I'm putting together a cheap bare bones high altitude ballon option with one camera and an more expensive option with a hd camcorder and camera
[19:48] <fsphil> mmmmm HD
[19:48] <akaGoose> Sorry can't spell very well on iPad keyboard
[19:48] <akaGoose> Yeah hd
[19:48] <akaGoose> Maybe a kodak playsport zx3
[19:49] <fsphil> The amateur who joined us on our last chase has provided a small camera for the next flight
[19:49] <akaGoose> And a downward facing still cam with fisheye e
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[19:49] <akaGoose> Lens
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[19:55] <SpeedEvil> fsphil: Any progress on recovery?
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[20:12] <fsphil> SpeedEvil, none yet - can't get back until the weekend
[20:12] <SpeedEvil> Good luck!
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[20:13] <Lunar_Lander> hello
[20:18] <akaGoose> Hi
[20:25] <Dan-K2VOL> natrium42 jcoxon just checked out that DeLorme, looks great, any other info found RE coverage?
[20:26] <natrium42> didn't investigate further, release date is a bit off anyway
[20:27] <Dan-K2VOL> Ah the delorme blog says Iridium, full global coverage
[20:28] <Lunar_Lander> hi akaGoose SpeedEvil fsphil Dan-K2VOL natrium42
[20:28] <natrium42> hello lander de la lune
[20:28] <Dan-K2VOL> Hi lunar
[20:28] <Lunar_Lander> :)
[20:29] <Lunar_Lander> how is the ballooning going?
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[20:36] <Lunar_Lander> hm
[20:36] <Lunar_Lander> obviously nothing much going on
[20:37] <fsphil> not much tonight :)
[20:38] <Lunar_Lander> xD
[20:38] Action: fsphil is listening to a radio contest, and watching Springwatch
[20:38] <Lunar_Lander> today I was bashed because I didn't know the third binomic formula, but I have to say that this was after a day of lab and lectures
[20:39] <Lunar_Lander> I was told that forgetting the binomic formulas is "mathematically deadly"
[20:39] <Lunar_Lander> but now I am all right again
[20:41] <Lunar_Lander> oh hello jcoxon btw
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[20:44] <Lunar_Lander> fsphil btw, the people I met last summer flew their balloon again on June 5
[20:45] <fsphil> all go well?
[20:46] <Lunar_Lander> yes
[20:46] <akaGoose> I'm trying to put together a spec for a high altitude balloon, need help with what hardware to put in it..
[20:46] <Lunar_Lander> the geiger counter anomaly they had last summer appeared again
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[20:46] <Lunar_Lander> as the balloon came some 1.5 km higher, they think low pressure messes with the geiger system
[20:46] <fsphil> they may need to keep it pressurised
[20:47] <Lunar_Lander> yes
[20:47] <Lunar_Lander> and they had a pressure sensor in the balloon neck
[20:47] <fsphil> akaGoose, tracker, camera, anything else is optional :)
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[20:49] <akaGoose> Ok, what hardware do you use to control them?
[20:49] <SpeedEvil> AVR is typical.
[20:49] <SpeedEvil> Some have used arduino.
[20:49] <SpeedEvil> Any small 8 bit micro works.
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[20:50] <akaGoose> What is AVR?
[20:50] <SpeedEvil> It's a small 8 bit microprocessor from atmel, at the core of the arduino.
[20:50] <akaGoose> Avon valley railway?
[20:50] <akaGoose> Ah ok
[20:51] <SpeedEvil> It can also be lots more flexibly used without the arduino software.
[20:52] <akaGoose> Ok, what the learning curve like on that for someone who works in IT and had a bit of programming experience?
[20:53] <SpeedEvil> Not bad.
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[20:53] <SpeedEvil> http://ukhas.org.uk/guides:selecting_and_using_avr_programmers_and_development_boards?s[]=avr - seems on topic
[20:54] <SpeedEvil> There may be more useful stuff on the wiki
[20:54] <akaGoose> Are there guides which explain how to configure it ?
[20:54] <SpeedEvil> There is code and hardware designs I think
[20:54] <akaGoose> Ok
[20:54] <SpeedEvil> search on AVR
[20:54] <SpeedEvil> http://ukhas.org.uk/projects:ukhas_glider_project:code?s[]=avr - for example - C for a glider
[20:55] <SpeedEvil> wih various sensors.
[20:55] <akaGoose> Has anyone use a micro tax board for this or is that overkill / not suitable?
[20:56] <akaGoose> Atx not tax
[20:56] <SpeedEvil> err _vast_ overkill.
[20:56] <SpeedEvil> That's not to say it can't work.
[20:56] <SpeedEvil> But - you're meaning that you will need lots more battery, and helium and a more expensive balloon.
[20:56] <SpeedEvil> Wild guess - it might be 2-300 quid more to lift the ATX board.
[20:57] <SpeedEvil> And all the batteries.
[20:57] <akaGoose> Ahhh ok. Our budget is £1000 max
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[20:59] <akaGoose> Ok so I you were me and you had £1000 what would your design be?
[21:00] <SpeedEvil> Spend 200 quid on balloon, spend 800 on bathroom and insulation work. :)
[21:00] <akaGoose> Considering I'm after hd video and potentially stills as well?
[21:00] <akaGoose> Haha
[21:00] <SpeedEvil> I'm surprised there isn't more activitiy in here - it's usually more active at this time.
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[21:01] <akaGoose> I'll be around for then next few months sorting things out so....
[21:01] <SpeedEvil> http://ukhas.org.uk/frontpage:projects
[21:01] <akaGoose> Hopefully go to a launch before we get ours going
[21:01] <SpeedEvil> For example - has various projects - some of which have pictures and more details of the flight computers.
[21:01] <SpeedEvil> :)
[21:01] <SpeedEvil> afk now - cooking
[21:02] <akaGoose> K thanks
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[21:12] <Laurenceb_> wtf Nintendo
[21:13] <Laurenceb_> i want some of their weed
[21:14] <staylo> Wiid?
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[21:15] <akaGoose> Where do you guys get your helium?
[21:15] <fsphil> BOC mostly
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[21:16] <akaGoose> Ah ok.
[21:16] <akaGoose> I'm guessing not that many people use hydrogen..
[21:16] <fsphil> a few people in the US do
[21:16] <fsphil> I've not heard of anyone in the UK doing it
[21:16] <fsphil> though as the price of helium goes up, it'll probably happen
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[21:17] <akaGoose> Yeah I think we'll avoid it!
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[21:44] <UndeadMonkey> Hello all, I'm working on the same project as akaGoose, any suggestions on the lightest and or cheapest camera that'll do 1080p video, Found a few cameras that seem good from a weight/cost point of view, but nothing that'll record for long enough. Cheers.
[21:44] <Laurenceb_> hmm whats the simplest way to convert a 16bit unsigned int and a sign bit to a 32 bit signed integer?
[21:44] <fsphil> just cast it Laurenceb
[21:44] <fsphil> UndeadMonkey, HD Hero seem to be the HAB HD camera of choice atm
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[21:46] <UndeadMonkey> Thanks fsphil, I'll have a look.
[21:47] <Hibby> UndeadMonkey: that's what we used
[21:47] <Hibby> I can fling you some footage if you wish
[21:47] <fsphil> oh yea, was that ever uploaded Hibby?
[21:48] <Hibby> http://www.youtube.com/watch?v=tLj1vKhpeB8
[21:48] <Hibby> it's not in 1080p as the model used was just the GoPro HD, not the Hero, but same effect.
[21:48] <Hibby> the only issue was the lens fogged up on the way back down
[21:54] <fsphil> got a bit of moisture on the way up too
[21:55] <UndeadMonkey> Hibby: awesome video, got skydiving flashbacks watching the decent!
[21:57] <Randomskk> Laurenceb_: uint32_t n = ((uint8_t)sign << 31) | ((uint16_t)m & 0xFFFF); maybe?
[21:57] <Randomskk> uhm
[21:57] <Randomskk> that first is of course int32_t
[22:00] <UndeadMonkey> HD Hero looks awesome, to explain goose is assuming an unlimited budget, I'm working on the lowest possible cost model. So looking for something that'll do half decent video for not too exorbitant a cost. Although I'm suprised the HD Hero is as cheap as it is!
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[22:11] <UndeadMonkey> Hibby: after reading a couple of blogspot entries on your Fu-Sen launch looks like your working on a far higher level than goose and I are thinking for our first launch attempt! Don't think we'd have got our hypothetical GoPro HD back....
[22:14] <Hibby> UndeadMonkey: is that the stac station blog?
[22:14] <Hibby> the balloon launches were, effectively, run by students, and the FU-SEN group didn't have any clue about electronics/programming
[22:14] <UndeadMonkey> Yep, that's what I found.
[22:16] <Hibby> the satellite stuff and what goes on in the station is somewhat unrelated...it's just a convenient coincidence that I was able to pray on the students to persuade them that 434MHz was a good idea
[22:21] <fsphil> Randomskk, int32_t n = (sign ? (int32_t) m : -(int32_t) m) ?
[22:23] <UndeadMonkey> Hibby: So you not one of the Strathclyde students? I need to do some more googling.....
[22:24] <fsphil> 434 mhz is always a good idea :)
[22:24] <Randomskk> fsphil: ternary operator makes me sad
[22:24] <fsphil> can be useful
[22:24] <Randomskk> I won't deny that
[22:25] <Randomskk> I still think it's less clear :P
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[22:27] <Hibby> UndeadMonkey: I'm one of their academic contacts in the university
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[23:42] <SpeedEvil> Laurenceb: http://www.sciencedaily.com/releases/2011/06/110607164230.htm?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+sciencedaily+%28ScienceDaily%3A+Latest+Science+News%29&utm_content=Google+UK
[23:45] <BrainDamage> that's pretty neat
[23:46] <SpeedEvil> It is.
[23:48] <BrainDamage> I wonder if seismometers also automagically filter non-natural quakes
[23:48] <BrainDamage> I bet there can be quite few fake signals, explosions, landslides, etc
[23:49] <BrainDamage> sure, most don't hit magnitudes of real quakes, but there's tons of "instrumental" quakes which probably match in intensity
[23:50] <SpeedEvil> Not correlated in the right way
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[00:00] --- Wed Jun 8 2011