highaltitude.log.20080426

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[07:27] Topic changed on #highaltitude by jcoxon!n=jcoxon@81-178-72-70.dsl.pipex.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, logs: http://users.gridstar.net/~zeusbot/ , FHALP-3 launch today : http://natrium42.com/track
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[08:08] <mc-> good luck today!
[08:09] <mc-> edmoore, do you have all the I90 bits in Camb?
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[12:05] <Cooleo> Did FHALP-3 Launch? Its currently at a still altitude
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[14:59] <Hiena> Good afternoon!
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[15:17] <Cooleo> Hey
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[17:48] <Laurenceb> yo
[17:49] <Laurenceb> any news on the launch?
[17:50] Action: Laurenceb checks natrium42's page
[17:51] <Laurenceb> looks like it worked :P
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[18:39] <Laurenceb> hello
[18:39] <Laurenceb> how did it go?
[18:40] <RocketBoy> OK - we got it back
[18:40] <Laurenceb> I saw natriums page
[18:40] <Laurenceb> how high?
[18:40] <RocketBoy> which is the main thing
[18:40] <Laurenceb> :P
[18:40] <RocketBoy> don't know - jcoxon has the data
[18:40] <Laurenceb> ok, any photos?
[18:40] <RocketBoy> yep
[18:41] <Laurenceb> so did it work ok then?
[18:41] <RocketBoy> not properly - I don't really know what happened - we need the data to work it out
[18:41] <Laurenceb> I see
[18:42] <Laurenceb> did you have the radio throughout the flight?
[18:42] <RocketBoy> nope - the antenna broke shortly after launch
[18:42] <Laurenceb> on the balloon?
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[18:43] <RocketBoy> there was a backup tracker - but that seems to have fallen off at some point
[18:43] <Laurenceb> :(
[18:43] <Laurenceb> mc- hi there
[18:43] <Laurenceb> so the antenna on the balloon broke?
[18:44] <Laurenceb> that happened last time, whats going on
[18:45] <RocketBoy> the launch was quite rough - windy and 2 balloons made it worse
[18:46] <Laurenceb> ah, didnt realise you used two balloons
[18:46] <Laurenceb> mc-, did you post the gps?
[18:46] <RocketBoy> the antenna also needs to be made differently to make it more robust
[18:46] <RocketBoy> yep it was a pre atlas test
[18:47] <mc-> was it the GPS or radio ant that broke?
[18:47] <Laurenceb> radio ant
[18:48] <mc-> I had a eureka moment today, I built myself a GPS repeater, it took 15 mins
[18:48] <mc-> if I built this a few years ago, I could have saved myself days of time
[18:48] <Laurenceb> neat, how?
[18:49] <Laurenceb> two antenna and a preamp?
[18:49] <mc-> take an active ant, and connect a passive to the other end
[18:49] <Laurenceb> ah
[18:49] <Laurenceb> does it work?
[18:49] <mc-> and power up the active ant via an inductor
[18:49] <mc-> yes, really well
[18:49] <Laurenceb> sweet, must try this
[18:49] <Laurenceb> what sort of inductor?
[18:50] <mc-> tracking 7 sats on my desk
[18:50] <mc-> with an old gps
[18:50] <mc-> I used 1.5uH
[18:50] <mc-> any value will do
[18:50] <mc-> even a coil of wire
[18:50] <Laurenceb> yes
[18:50] <Laurenceb> did you post off the module?
[18:50] <mc-> yes
[18:50] <mc-> 2nd class
[18:51] <Laurenceb> when? havent got it yet
[18:51] <mc-> last week, couldn't find a 1st class
[18:51] <Laurenceb> ah 2nd, nvm
[18:51] <Laurenceb> hopefully be here monday or tuesday
[18:51] <Laurenceb> thanx
[18:52] <Laurenceb> RocketBoy: did you get my parcel?
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[18:54] <RocketBoy> there is one waiting in the parcel office for me
[18:55] <Laurenceb> ok... it wasnt that big
[18:55] <RocketBoy> might be it - or could be ink cartrages I waiting for
[18:55] <Laurenceb> is your letterbox small?
[18:57] <Laurenceb> it was just in a A4 envelope, but there was a lot of foam in there, so it might have been a bit big
[19:02] <RocketBoy> bbl
[19:10] <Laurenceb> me 2
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[19:44] <RocketBoy> hiya jatkins - hoes it going
[19:45] <RocketBoy> how's
[19:46] <jatkins> ok, thanks
[19:46] <jatkins> how did FHALP-3 go?
[19:47] <RocketBoy> well we got it back - but it had a few problems
[19:47] <jatkins> oh
[19:48] <RocketBoy> we lost radio comms (the antenna broke) - and the spare tranansmitter fell off
[19:48] <Laurenceb> back
[19:48] <jatkins> oh
[19:48] <jatkins> just had a look on natrium's tracker
[19:48] <jatkins> how did you find it?
[19:48] <RocketBoy> mu the text systems worked - so it texted its position on landing
[19:48] <jatkins> oh right
[19:48] <jatkins> gsm?
[19:48] <RocketBoy> yep
[19:49] <jatkins> cool
[19:49] <RocketBoy> i just updated the wiki with the launch and landing spots
[19:49] <jatkins> nice, just gonna have a look
[19:49] <Laurenceb> theres a ball here
[19:50] <Laurenceb> got apprehended by two men in black style characters
[19:50] <Laurenceb> crazy, when david milliband was here I could have walked right in
[19:51] <jatkins> lol
[19:51] <jatkins> rocketboy: the pegasus wiki or the ukhas one?
[19:51] <RocketBoy> the ukhas one
[19:51] <jatkins> ok
[19:52] <jatkins> I guess antennas braking off is quite common?
[19:52] <Laurenceb> they told me I couldnt get in unless I went to the other gate two streets away, so I climbed over a wall just behind them ans made a run for it :P
[19:52] <jatkins> lol
[19:53] <jatkins> :D
[19:53] <RocketBoy> the antennas have broken a couple of times
[19:54] <Laurenceb> yes, need to take a look at that problem I guess
[19:54] <jatkins> is it not possible to tape them to the payload container
[19:54] <jatkins> ?
[19:54] <jatkins> or would that intefere with the signal?
[19:55] <jatkins> interfere*
[19:55] <Laurenceb> I dont astually see how they can brake, they are pretty strong if soldered and glued
[19:55] <RocketBoy> that would be ok - but the containers are too small usually
[19:55] <RocketBoy> bbl
[19:55] <Laurenceb> jatkins: you have to keep the geometry right
[19:56] <jatkins> cya
[19:56] <jatkins> laurenceb: as in pointing in the right direction?
[19:57] <Laurenceb> yes, and the angles between the ground plane elements ect
[19:58] <jatkins> ok
[19:58] <jatkins> wouldn't it be ok with an omnidirectional receiver?
[19:59] <Laurenceb> you want a directional reciever
[19:59] <Laurenceb> as the gain is higher when you line up the antenna
[19:59] <jatkins> ok
[20:00] <jatkins> is it easier with morse?
[20:00] <jatkins> - can you just use an aerial for that?
[20:02] <Laurenceb> you want to use the 1/4 wave design
[20:03] <jatkins> what's that
[20:03] <jatkins> ?
[20:07] <jatkins> http://www.flickr.com/photos/natrium42/1796152745/sizes/l/
[20:08] <jatkins> the HALO-2 setup would be safer probably
[20:08] <jatkins> just a radio modem + aerial - so easy to stabilize and attach to payload container
[20:12] <Laurenceb> but its 900mhz
[20:13] <jatkins> oh yeah
[20:13] <jatkins> you can't get 434 MHz modems?
[20:13] <Laurenceb> not legal for high altitude
[20:13] <Laurenceb> unless you buy one off me :P
[20:14] <Laurenceb> or buy/borrow one off RocketBoy
[20:15] <jatkins> oh right
[20:15] <jatkins> isn't the transmitted signal the same as a normal transmitter?
[20:16] <Laurenceb> theres different modulation schemes
[20:16] <jatkins> ok
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[20:27] <Laurenceb> PORTC = ((PORTC & ~0x18) | 0x10); I like that :P
[20:28] <Laurenceb> a really cool thing is you can flip PORT register bits by writing to the PIN register on AVR
[21:02] <Laurenceb> RocketBoy: you there?
[21:06] <Cooleo> Hey, Congrats on the launch today :) Watched it online :P
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[22:56] <fnoble> hello
[22:59] <Laurenceb> hi
[23:00] Action: Laurenceb is confused by the nonlinear free surface equations over a topography :-/
[23:00] <Laurenceb> it would help if I wasnt a few dozen meters away from a 100 decibel speaker
[23:01] <Laurenceb> stupid ball
[23:01] <Laurenceb> RocketBoy: about?
[23:05] <fnoble> bbl
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[23:12] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[23:12] Topic changed on #highaltitude by jcoxon!n=jcoxon@host86-144-103-14.range86-144.btcentralplus.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, logs: http://users.gridstar.net/~zeusbot/
[23:16] <fnoble> back
[23:17] <natrium42> hey fnoble
[23:17] <natrium42> jcoxon, when's your launch?
[23:17] <jcoxon> been and gone
[23:17] <jcoxon> hehe
[23:17] <natrium42> aah
[23:17] <natrium42> so you found it?
[23:17] Action: natrium42 checks tracker
[23:18] <jcoxon> yup
[23:18] <natrium42> yay, awesome
[23:18] <jcoxon> though the flight went pretty damn adly
[23:18] <jcoxon> baadly*
[23:18] <natrium42> didn't get high?
[23:18] <Laurenceb> jcoxon: well done anyway
[23:18] <Laurenceb> :P
[23:19] <natrium42> did josh launch too?
[23:19] <jcoxon> the flight computer cut out at launch
[23:19] <Laurenceb> max altitude?
[23:19] <jcoxon> and only turned back on on landing
[23:19] <Laurenceb> ouch
[23:19] <natrium42> d'oh
[23:19] <jcoxon> at least it turned on
[23:19] <jcoxon> !
[23:19] <natrium42> yes indeed
[23:20] <jcoxon> it was a dual balloon launch
[23:20] <jcoxon> its pretty difficult to do and very rough
[23:20] <natrium42> pics or it didn't happen!
[23:20] <jcoxon> on flickr
[23:20] <natrium42> got the url handy?
[23:21] <jcoxon> used the same camera as last time
[23:21] <jcoxon> which was a mistake as they were blury again
[23:21] <jcoxon> it has focus issues
[23:22] <jcoxon> the cheap premiers are much better
[23:22] <jcoxon> http://www.flickr.com/photos/jcoxon77/sets/72157604705012806/
[23:23] <Laurenceb> looks quite high
[23:23] <natrium42> ah
[23:23] <natrium42> WB8ELK launched another test ballon btw
[23:23] <natrium42> something going on in #SNOX
[23:23] <Laurenceb> pity about the pics being blurred
[23:23] <jcoxon> Laurenceb, the thumbnails look good :-p
[23:24] <Laurenceb> :P
[23:24] <jcoxon> the sky was really nice today
[23:24] <Laurenceb> yes, I've had good experience with the premier cameras
[23:24] <jcoxon> so have i
[23:25] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:mihab:rgb-compose.jpg <-- with a premier
[23:25] <jcoxon> i think its a lot to do with the infinity focus setting
[23:25] <jcoxon> we have a video of the launch which will be cool
[23:25] <Laurenceb> neat
[23:26] <jcoxon> and we we could see it through the scope for a good 30mins
[23:26] <jcoxon> so it wasn't all bad
[23:27] <jcoxon> and i got it back
[23:27] <jcoxon> natrium42, the tracker worked well
[23:27] <natrium42> good to hear :)
[23:27] <jcoxon> now just need to make away of getting it to do inflight tracking
[23:27] <jcoxon> natrium42, can you access a list of points?
[23:28] <natrium42> sure
[23:28] <jcoxon> just i want to compare it to the texts i received and also the sparse flight logs
[23:28] <fnoble> jcoxon: why do you think the camera stopped taking pictures? do you think this could have been at burst point
[23:28] <natrium42> ok, let me get it
[23:28] <fnoble> and it got a big jolt?
[23:29] <jcoxon> fnoble, it was pretty exposed - perhaps cold
[23:29] <jcoxon> we left a big whole in hte packaging to expose all the silly sensor windows
[23:29] <fnoble> ok, and i guess it wouldnt turn itself back on
[23:29] <jcoxon> well it should in theory
[23:30] <jcoxon> as its turned on by inserting the battery
[23:30] <jcoxon> perhaps that came lose
[23:31] <Laurenceb> I'd avoid pp3 connectors btw
[23:31] <natrium42> jcoxon, my internets are slow
[23:31] <Laurenceb> you can get leaded battery packs from farnell and places, thats what I put on the aerosol hab
[23:32] <jcoxon> oooooo my flickr pictures in total have had 45128 views
[23:32] <Laurenceb> nice
[23:32] <jcoxon> actually its 57523
[23:33] <Laurenceb> btw the department is going to make a ground based version of the aerosol hab
[23:33] <Laurenceb> should be cool
[23:34] <Laurenceb> using the ethernet on the ngw100 you'll be able to log in remotely and set it up
[23:34] <jcoxon> cool
[23:34] <jcoxon> right
[23:34] <jcoxon> i'm off
[23:34] <Laurenceb> cya
[23:34] <jcoxon> very long day driving
[23:34] <Laurenceb> I can imagine
[23:34] <natrium42> jcoxon, which format do you want? excel or csv?
[23:34] <jcoxon> night all
[23:34] <jcoxon> csv would be best
[23:34] <jcoxon> don't have excell
[23:34] <natrium42> ok, email?
[23:34] <jcoxon> yeah
[23:35] <jcoxon> jacoxon@googlemail.com
[23:35] <natrium42> k
[23:35] <jcoxon> my email address is all over the net
[23:35] <jcoxon> soooo much spam
[23:35] <jcoxon> good old gmail keeps it all tidy though
[23:35] <jcoxon> right
[23:35] <jcoxon> night all
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[23:36] <natrium42> nite
[23:36] <natrium42> sent the email
[23:38] Action: Laurenceb realises that balls typically last all night
[23:39] <Laurenceb> there goes any hope of some sleep :-/
[23:39] <natrium42> eh?
[23:39] <natrium42> you're going to it?
[23:39] <Laurenceb> college ball
[23:40] <Laurenceb> no, too much work
[23:40] <Laurenceb> revision + three problem sets
[23:41] <natrium42> haha
[23:41] <natrium42> so exams aren't over yet?
[23:41] <Laurenceb> no, two months to go before exams
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[23:41] <natrium42> lots of time
[23:42] <natrium42> that one is nice --> http://www.flickr.com/photos/jcoxon77/2443227675/sizes/o/
[23:42] <Laurenceb> submitted my project work yesterday :P thats a third of the marks down ;P
[23:42] <Laurenceb> nice, like the clouds
[23:43] <Laurenceb> http://www.flickr.com/photos/jcoxon77/2443209477/in/set-72157604705012806/ <-- lol
[23:44] <Laurenceb> edmoore I think...
[23:44] <natrium42> hehe
[23:47] <Laurenceb> I'm contemplating staying up all night....
[23:49] <natrium42> it's hard
[23:49] <natrium42> i used to be able to do it
[23:49] <Laurenceb> its not like I can get any sleep :-(
[23:51] <Laurenceb> if I have a function in a c program, do I have to have a primative?
[23:51] <Laurenceb> just wondering about my parafoil code.... main.c has a few functions that are only used from within main.c, is it ok that they arent defined in the header?
[23:52] <natrium42> sure, you don't need to declare them
[23:53] <Laurenceb> its only if I want to use them in another file in the project?
[23:53] <natrium42> but then you cannot call functions that are below the code where you call them
[23:53] <Laurenceb> yes
[23:53] <Laurenceb> how does it work? as the declaration in the header just tells you about the function
[23:54] <Laurenceb> not the actual function
[23:54] <Laurenceb> is it just like a placeholder of the compiler?
[23:55] <natrium42> declaration just tells the compiler that that function exists
[23:55] <natrium42> and what the parameter list and return type is
[23:55] <natrium42> definition is the function intself
[23:56] <Laurenceb> so the compiler is then happy to wait until its compiling a later piece of code to find the actual function?
[23:56] <natrium42> yep
[23:56] <Laurenceb> ok, got it
[23:56] <Laurenceb> thanx
[23:56] <natrium42> np
[23:57] <Laurenceb> I found it helped to draw a diagram of the different dependencies - http://wiki.ukhas.org.uk/_media/code:dependencies.png
[23:58] <Laurenceb> whats the correct term for that? Just a dependency diagram?
[00:00] --- Sun Apr 27 2008