highaltitude.log.20101227

[00:00] <Lunar_Lander> lol
[00:01] <Laurenceb_> http://www.youtube.com/watch?v=H3-Ksa2anhE <-eek
[00:02] <Lunar_Lander> lol
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[00:03] <Lunar_Lander> http://www.youtube.com/watch?v=vsZ8m9y12Rk&feature=related
[00:08] <Randomskk> lasers: awesome
[00:08] <Laurenceb_> http://www.sportpost.com/video/view/Guy+skateboarding+on+fire
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[00:26] <Lunar_Lander> good night
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[11:40] <TraumaPrincess> Would an LM317 regulator provide sufficient heating?
[11:40] <TraumaPrincess> Where sufficient is highly ambiguous.
[11:41] <Randomskk> it is
[11:41] <Randomskk> also the heating it provides depends on the current going through it
[11:41] <Randomskk> insulate your box well and it'l be okay.
[11:41] <Darkside> why do you need heating :)
[11:41] <Darkside> im sure most of your components will survive to -40 or so :)
[11:41] <TraumaPrincess> Because we're not sure the rated temps of the components we're going to be using (i.e. a beagleboard)
[11:41] <Darkside> stick a temp sensor in there to see what happens
[11:42] <Darkside> oooooooohd ear
[11:42] <Darkside> dear
[11:42] <Darkside> yes, i've been planning on doing a beagleboard payload
[11:42] <Darkside> im sure it will generate enough heat by itslef..
[11:42] <TraumaPrincess> True enough
[11:42] <Darkside> you should do some testing first
[11:42] <Darkside> stick it in a box, and stick it in a freezer
[11:43] <TraumaPrincess> Yeah, we're gonna be doing that. We're just not sure how accurate it would be due to the relatively high pressure as compared to at altitude
[11:43] <Darkside> still a good test
[11:43] <TraumaPrincess> Yeah.
[11:43] <Darkside> i dropped my Atmel XMega to -55 degrees :)
[11:43] <Darkside> it survived
[11:43] <TraumaPrincess> Is 5cm of styrofoam with mylar on either side good insulation? Too much? Not enough?
[11:43] <Darkside> that should be fine :)
[11:43] <Darkside> it will still get cold inside the box im sure
[11:44] <Darkside> hmm, does mylar block radio?
[11:44] <Darkside> i.e. GPS
[11:44] <TraumaPrincess> I think it would, but we're making some holes for antennas.
[11:44] <Darkside> heh ok
[11:44] <Darkside> cool
[11:45] <TraumaPrincess> iirc, mylar is PET with a layer of aluminium deposited on it
[11:45] <Darkside> mm
[11:45] <Darkside> aaaanyway
[11:45] <Darkside> beagleboard, eh?
[11:45] <Darkside> how are tou powering it?
[11:45] <TraumaPrincess> Two lipos along with an lm317
[11:45] <Darkside> hrmm
[11:45] <Darkside> lipos will freeze
[11:46] <Randomskk> not if the box stays warm
[11:46] <Darkside> like, if they go below 0 deg C, their electrolyte will freeze
[11:46] <Darkside> yeah, but keeping the box warm wastes power
[11:46] <Randomskk> but typically people use lithium batteries, yea
[11:46] <Darkside> use lithium primary cells, like energizer lithium AAs
[11:46] <TraumaPrincess> hmm
[11:46] <Randomskk> a four pack of AAs of them
[11:46] <TraumaPrincess> How light are they?
[11:46] <Darkside> they have a capacity of 3Ah
[11:46] <Randomskk> they last ages
[11:46] <Darkside> TraumaPrincess: light enough
[11:47] <Darkside> you need 5V right?
[11:47] <TraumaPrincess> yup
[11:47] <Darkside> so you can use wither 4 or 8 batteries
[11:47] <Darkside> 6V at 3Ah or 6Ah
[11:47] <Darkside> then you could get a switchmode regulator to drop that to 5V, or do something else
[11:47] <Randomskk> you may not even need 6V
[11:48] <Darkside> oh wait, the beagleboard will draw a shitload of current wont it
[11:48] <TraumaPrincess> Yeah
[11:48] <Randomskk> though bear in mind lithium cells are not 1v5
[11:48] <TraumaPrincess> 500ma
[11:48] <Darkside> fuuu
[11:48] <Darkside> hmm
[11:48] <Randomskk> 0.5A isn't all that much :P
[11:48] <Darkside> yer
[11:48] <Darkside> im thinking how to regulate it down
[11:48] <Darkside> use more batteries :)
[11:48] <Randomskk> hehe
[11:48] <Darkside> and then use a linear reg
[11:48] <Randomskk> can you control that usage or is it 500mA all the time?
[11:48] <Darkside> i did that on my board :D
[11:49] <Darkside> had 8 AAs, giving 12V for my radio amp stuff, then used a 7805 to drop it to 5 - that 7805 got HOT
[11:49] <Darkside> like, it hit 75 degrees within a minute
[11:49] <TraumaPrincess> Randomskk, pretty sure it's dependant on usage
[11:49] <Darkside> it will be
[11:49] <Darkside> me and shenki had a look at that
[11:50] <Darkside> also it could draw more than 500ma depending on what you add to it
[11:50] <TraumaPrincess> I've read that lm3xx's are better due to higher efficiencies?
[11:50] <Darkside> ndi
[11:50] <Darkside> nfi*
[11:50] <Darkside> i have these dinky little switchmode regulaotrs which are cool, but they wont do more than 500mA
[11:51] <Darkside> aaaanyway, what peripherals are you putting ont eh beagleboard?
[11:51] <russss> the thing is with sufficiently good insulation you might end up with overheating too, especially on the ground.
[11:51] <Darkside> russss: meeeeeeeeeeeeeh
[11:51] <Darkside> been there, done that
[11:51] <Darkside> my box hit 45 degrees before launch
[11:51] <TraumaPrincess> gps, radio connection, gyros, accelerometers, magnemetomers, hspda modem
[11:52] <Darkside> TraumaPrincess: so more than 500mA then
[11:52] <Darkside> :)
[11:52] <Darkside> a LOT more
[11:52] <TraumaPrincess> Oh, and a camera. Yeah
[11:52] <Darkside> you're looking a few amps then
[11:52] <TraumaPrincess> Indeed
[11:52] <Darkside> ditch the HSDPA modem :P
[11:52] <russss> no substitute for measuring it yourself
[11:52] <Darkside> hehe
[11:52] <TraumaPrincess> heh, it's for finding it on the ground, Darkside
[11:52] <Darkside> thats what your GPS and telemetry transmitter are for
[11:53] <Darkside> whats your 'radio connection' ?
[11:53] <TraumaPrincess> as in what radio or protocol or what
[11:53] <Darkside> what radio
[11:53] <TraumaPrincess> Not sure, I'm not doing that bit
[11:53] <Darkside> is it an xbee or something?
[11:53] <TraumaPrincess> http://www.alinco.com/Products/DJC1C4T.shtml Something like this, iirc
[11:54] <Darkside> most people here use Radiometrix NTX2's which have brilliant range
[11:54] <Darkside> what the heck
[11:54] <Randomskk> well, the range is really only because on the receiver side we have really really sensitive radios with massive directional antennas
[11:54] <Darkside> Randomskk: >_>
[11:54] <Darkside> we use a quarter wave ground plane antenna, on a car
[11:55] <Darkside> TraumaPrincess: pip out the GPS coords via that transmitter all the time
[11:55] <Darkside> then just work out wher eit lands from that :)
[11:55] <TraumaPrincess> Yeah, that's what we're going to do
[11:56] <Darkside> hang on, how are tou driving that?
[11:56] <Darkside> via the beagleboards sound card? >_>
[11:56] <TraumaPrincess> The radio? yeah
[11:56] <Darkside> fuuu
[11:56] <TraumaPrincess> ax25
[11:56] <Darkside> heh ok
[11:56] <TraumaPrincess> Why?
[11:56] <Darkside> we've only down RTTY on ours
[11:56] <Darkside> 300 baud
[11:57] <Darkside> very resilient
[11:57] <Darkside> are you doing 2-way communication via that?
[11:57] <TraumaPrincess> Yep
[11:57] <TraumaPrincess> Hopefully we'll be able to telnet in to it =D
[11:57] <russss> the UKHAS standard is 300 baud RTTY at 10mW. But the reason for that is because 10mW is the legal limit in the UK.
[11:57] <russss> so we can't use AX25, not enough power.
[11:57] <Darkside> TraumaPrincess: hold on, AU?
[11:57] <Darkside> whaaaaa
[11:58] <TraumaPrincess> ja
[11:58] <Darkside> where?
[11:58] <Darkside> <-- University of Adelaide
[11:58] <TraumaPrincess> Brisbane
[11:58] <Darkside> oh man
[11:58] <Darkside> seriously
[11:58] <TraumaPrincess> Though we're not doing it here, it's gonna be done in the US =p
[11:58] <Darkside> i'm talking at linuxconf about high altitude balloonong
[11:58] <Darkside> ballooning*
[11:58] <Darkside> well, at the arduino miniconf :)
[11:59] <TraumaPrincess> hehe
[11:59] Action: TraumaPrincess is at QUT doing an avionics degree
[11:59] <Darkside> and, funnily enough, whats being built at the arduino miniconf is a modified version of juxta's flight computer
[11:59] <Darkside> complete with AVR, GPS, UHF transmit module, and so on
[12:00] <TraumaPrincess> nice
[12:00] <Darkside> i.e. the barebones way of doing it
[12:00] <Darkside> though yes, i want to do a beagleboard flight too
[12:00] <Darkside> i'd drop the data rate on your AX25 stuff tho
[12:00] <Darkside> 1200 baud might be a bit touchy
[12:01] <TraumaPrincess> Indeed
[12:01] <Darkside> hell, we have problems with 300 baud RTTY sometimes
[12:01] <Darkside> tho thts 25mW output power, not 300mW
[12:01] <Darkside> and we do sideband, not FM
[12:01] <Darkside> (though that helps a lot)
[12:02] <Darkside> are you going to be in brisbane around the 23rd of jan?
[12:02] <TraumaPrincess> I might actually be in melb then haha
[12:03] <Darkside> damn :(
[12:03] <Darkside> thats when linuxconf is, and when i'll be in brisbane ;)
[12:03] <TraumaPrincess> heh
[12:05] <Darkside> aaaaayway, good luck on your launch - when is it happening?
[12:05] <TraumaPrincess> no idea, we haven't built anything yet, just hashing out plans
[12:05] <Darkside> heh ok
[12:05] <Darkside> well, i'd reccomend probably not using that kind of transceiver :P
[12:05] <Darkside> though tbh it would probably work
[12:06] <Darkside> we have been looking at that kind of stuff
[12:06] <TraumaPrincess> Why not?
[12:06] <Darkside> i guess with a beagleboard tou have another layer of abstraction to deal with, so i can see how it would work
[12:07] <Darkside> you were just going to do sound card AX25?
[12:07] <Darkside> that could be pretty cool to do...
[12:07] <TraumaPrincess> Yeah
[12:07] <TraumaPrincess> I think that's how it's done anyway
[12:07] <Darkside> i'd try and do some range testing first
[12:07] <Darkside> i had the idea of doing a wifi link to the payload i want to make :)
[12:08] <Darkside> my link budget says i can push 1mbit to a payload about 50km away, if i use 500mW transmitters on either end, and a 24dBi dish on the ground
[12:09] <TraumaPrincess> Not a bad idea, in my uneducated opinion
[12:09] <Darkside> i dont know how well it would work in practice
[12:09] <Darkside> but i'd like to try - i'd jhave backup systems of course
[12:09] <Darkside> and it would fly with one of juxta's payloads, whigh are tried and tested
[12:10] <Darkside> project horus hasn't lost a payload so far :)
[12:10] <TraumaPrincess> How far do they get blown on average?
[12:10] <Darkside> even with landings offshore, and in the middle of a 4wd only accessible national par
[12:10] <Darkside> http://projecthorus.org/
[12:10] <Darkside> go take a look :)
[12:12] <Darkside> http://projecthorus.org/?page_id=1497 - my dodgy as hell HF transmitter
[12:12] <TraumaPrincess> I doubt it'd be able to be done from Brisbane due to us being right on the east coast, haha
[12:13] <TraumaPrincess> nice
[12:13] <TraumaPrincess> How big is the interior of that? We're thinking 15cm^3, but of course we have to actually see what electronics we use, first
[12:14] <Darkside> not sure of the exact area
[12:14] <Darkside> mine was biiig
[12:14] <Darkside> but still, it worked fine
[12:15] <TraumaPrincess> Nice idea with the fin
[12:15] <Darkside> thats all juxta's stuff :)
[12:16] <Darkside> i just did the HF payload on that one - that was a uni project
[12:16] <juxta> helped with its performance in aquatic conditions
[12:16] <Darkside> oh hey juxta
[12:16] <juxta> heya :)
[12:16] <Darkside> juxta: hahahaha
[12:16] <Darkside> you mean it broke off
[12:16] <Darkside> just after the smiley face, so we still had a happy box
[12:18] <TraumaPrincess> Darkside: In the launched! pic, what's what? Obviously the balloon's the balloon, and the bottom one is the payload, but what are the other three things?
[12:19] <Darkside> from bottom to top: UHF Payload (juxta's), HF Payload (mine), parachute, radar reflector, balloon
[12:19] <TraumaPrincess> Ah, right
[12:19] <fsphil> slight off topic: http://projecthorus.org/wp-content/uploads/2010/10/DSC_9958.jpg -- there are more antennas on that car than my house
[12:19] <Darkside> hahahahahahaha
[12:20] <Darkside> man, adrians car is worse now..
[12:20] <Darkside> well, better :)
[12:20] <fsphil> haha
[12:20] <TraumaPrincess> What's the software used in the pic from inside the car?
[12:21] <juxta> TraumaPrincess, that's dl-fldigi
[12:21] <juxta> a distributed listener modification of fldigi, intended for tracking balloons :)
[12:21] <Darkside> the software basically everyone here uses :P
[12:22] <Darkside> no fancy APRS stuff for us (well, mostly) - we use boring 300 baud RTTY for downlinking data :)
[12:22] <TraumaPrincess> ah, how's it work?
[12:22] <TraumaPrincess> heh
[12:22] <TraumaPrincess> The guy handling the radios wants us to use aprs *shrug* I'm a complete noob at radio stuff
[12:23] <juxta> the balloon payload broadcasts 300b RTTY, it's received by multiple listeners and the data is pooled on a google maps based tracker
[12:23] <juxta> well, 300b in our case, but it's not a fixed rate
[12:24] <fsphil> most uk people seem to use 50 baud
[12:24] <Darkside> and its sideband RTTY - basicallt the payload broadcasts a raw carrier wave, which is shifted in frequency
[12:24] <fsphil> although I've been using 300 too with no problems
[12:24] <Darkside> that means with good radios on the receive end, you can get awesome range
[12:25] <TraumaPrincess> Ah
[12:25] <TraumaPrincess> Is it up/down?
[12:25] <Darkside> TraumaPrincess: one frequency for a '1', one frequency for a '0'
[12:25] <russss> I think we would probably use APRS if we could here.
[12:25] <TraumaPrincess> Yeah I meant fullduplex XD
[12:25] <Darkside> oh
[12:25] <Darkside> nah, downlink only
[12:26] <Darkside> in most cases theres nothing you need to do on uplink
[12:26] <Darkside> it broadcasts where it is, and what else is going on
[12:26] <Darkside> and thats all we care about
[12:26] <Darkside> what would you do with an uplink?
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[12:27] <TraumaPrincess> Command it to take pics/movies/etc, feed it additional position data, kill the balloon, etc
[12:27] <Darkside> why command it to take pics? do all that automatically
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[12:27] <TraumaPrincess> We're using it to test a cubesat design
[12:27] <Darkside> killing the balloon is a valid reason, but theres other ways of doing that
[12:27] <Darkside> >_>
[12:27] <TraumaPrincess> (Eventaully)
[12:27] <Darkside> goddamn brisbane universities doing all sorts of fancy crap
[12:28] <TraumaPrincess> hehe
[12:28] <Darkside> :(
[12:28] <Darkside> why can't adelaide uni do any of this cool stuff :P
[12:28] <TraumaPrincess> It's not a uni thing :P
[12:28] <TraumaPrincess> Although actually, I could do it as my final year project
[12:28] <Darkside> instead i'm doing passive radar :P
[12:28] <TraumaPrincess> hehe
[12:28] Action: TraumaPrincess has two radar units in her degree <_<
[12:28] <Darkside> haha
[12:28] <TraumaPrincess> One of them is called military combat electronics ^-^
[12:28] <Darkside> ooh
[12:28] <Darkside> noice
[12:28] <TraumaPrincess> Yeah, heh
[12:29] <Darkside> aaaaaaaaaaaanyway... let us know how it all goes ;)
[12:29] <TraumaPrincess> It's unlikely to be done any time soon, lol
[12:29] <Darkside> if you need help launching you coudl come down here :P
[12:29] <Darkside> cheaper than going to the US :P
[12:30] <TraumaPrincess> heh, I won't have any hands on with it, unfortunately ._.
[12:30] <Darkside> awwwwww
[12:30] <TraumaPrincess> They wanna do it in the mojave
[12:30] <Darkside> ahh
[12:30] <TraumaPrincess> How fast do they come down?
[12:31] <Darkside> depends if you have a parachute or not ;)
[12:31] <TraumaPrincess> heh
[12:31] <TraumaPrincess> Assuming one does
[12:31] <Darkside> most launches we've done land at about 4-5m/s
[12:31] <Darkside> which is pretty soft
[12:32] <Darkside> as long as the bits in your payload are duct taped down or whatever, it should be fine
[12:32] <TraumaPrincess> Sounds high >_<
[12:32] <TraumaPrincess> Yeah, I'm thinking velcro
[12:32] <Darkside> hrmmmm
[12:32] <TraumaPrincess> At least for the lighter stuff
[12:32] <Darkside> i guess that would hold it
[12:32] <TraumaPrincess> Hadn't thought of duct tape >_<
[12:33] <fsphil> !!
[12:33] <Darkside> hey, my payload survived, and what was just duct taped down..
[12:33] <Darkside> fsphil: !!
[12:33] <fsphil> should just make a payload box out of duct tape only
[12:33] <TraumaPrincess> heh
[12:34] <fsphil> oh the !! was for TraumaPrincess not thinking of duct tape :)
[12:34] <TraumaPrincess> XD
[12:34] <fsphil> everything improved with duct tape
[12:35] <TraumaPrincess> I should probably look at getting a radio license.
[12:35] <Darkside> TraumaPrincess: yes :)
[12:35] <TraumaPrincess> I'd probably never use it, though; I practically never speak o_O
[12:35] <Darkside> i'm still working out when i can get an exam done for mine...
[12:35] <Darkside> aww
[12:36] <fsphil> I've had one voice contact so far, and a license for a year :)
[12:36] <fsphil> 5 watts seems to be useless for voice on HF
[12:37] <Darkside> tried data?
[12:37] <TraumaPrincess> Also, as for fldigi, we're just thinking telnet over ax25. Does that sound feasible?
[12:37] <Darkside> TraumaPrincess: laaaaaaag
[12:37] <TraumaPrincess> hehe
[12:38] <fsphil> wspr works fairly well -- but that would probably work without an antenna :)
[12:38] <Darkside> dont use telnet - make your own system
[12:38] <TraumaPrincess> In what way?
[12:38] <Darkside> send it messages, and have it process them and add data to a queue or something to be transmitted
[12:38] <TraumaPrincess> ah right
[12:38] <Darkside> maybe send an acknowledgement immediately, or whatever
[12:38] <Darkside> many ways of doing it
[12:40] <Darkside> hell, our payloads just sent out ASCII data :P
[12:40] <TraumaPrincess> What about tcp/ip over ax25? Would that be terrible?
[12:40] <Darkside> extremely terrible
[12:40] <fsphil> I've been trying 300 baud rtty on HF, listening on some online radios -- but so far nobody can hear anything
[12:40] <TraumaPrincess> hehe
[12:40] <Darkside> $$HORUS,373,12:30:11,-35.1348,138.8340,1756,6,8;28;4*0A4F
[12:40] <Darkside> theres an example data sentence
[12:41] <Darkside> $$Callsign,TXCount, time, lat, long, altitude, speed, number of sats; internal temp; external temp * checksum
[12:41] <TraumaPrincess> id/message id/time/location/location/alt-
[12:41] <TraumaPrincess> ah
[12:41] <TraumaPrincess> Does NRMA provide a method for a velocity vector?
[12:41] <TraumaPrincess> er
[12:41] <TraumaPrincess> not nrma
[12:42] <Darkside> NMEA
[12:42] <TraumaPrincess> yeah that.
[12:42] <TraumaPrincess> Just saw an NRMA ad <_<
[12:42] <Darkside> it can provide speed and heading, so i guess so
[12:42] <Darkside> we use uBlox modules run in polled mode
[12:42] <TraumaPrincess> oh well, we're gonna be combining GPS with an IMU
[12:42] <Darkside> so they give us all the data we need in one sentence - all teh other NMEA sentences get turned off
[12:43] <Darkside> whats the IMU for?
[12:43] <TraumaPrincess> Testing it for future use :P
[12:43] <Darkside> ahh ok
[12:43] <Darkside> that'll output a lot of data..
[12:43] <TraumaPrincess> Yeah
[12:43] <Darkside> you wont want to be sending that down the radio link
[12:44] <TraumaPrincess> Nah, just grab it once every couple of seconds
[12:44] <Darkside> yer
[12:45] <Darkside> anyway, i'd better get to bed
[12:45] <Darkside> have fun with your storms up in brissie
[12:45] <TraumaPrincess> wat it's like 9pm
[12:45] <TraumaPrincess> haha
[12:45] <Darkside> 11:45pm..
[12:45] <TraumaPrincess> It's rained 330mm this month
[12:46] <TraumaPrincess> I thought you're in adelaide?
[12:46] <Darkside> in tassie atm :)
[12:46] <TraumaPrincess> ah
[12:46] <Darkside> christmas holiday :P
[12:46] <TraumaPrincess> What a terrible location
[12:46] <TraumaPrincess> then again, Ic an't really talk
[12:46] <Darkside> whaaaaaaaaaa
[12:46] <Darkside> where i am is awesome atm :P
[12:46] <Darkside> i'll be back in adelaide on wednesday though
[12:47] <TraumaPrincess> nn
[12:48] <Darkside> also its 11:18 in adelaide atm :P
[12:48] <Darkside> adelaide is only half an hour behind
[12:48] <TraumaPrincess> o.O
[12:48] <TraumaPrincess> you use DST there too?
[12:49] <Darkside> yep
[12:49] <TraumaPrincess> fools
[12:49] <Darkside> haha
[12:49] <Darkside> you don't?
[12:49] <TraumaPrincess> nup
[12:49] <Darkside> hahahahaha
[12:49] <Darkside> bloody QLD
[12:50] <Darkside> wait does that mean you're an hour behind or something?
[12:50] <fsphil> everytime the DST change happens here they keep talking about how we should get rid of it
[12:50] <fsphil> but they never do
[12:50] <Darkside> so you're at +10GMT?
[12:50] <TraumaPrincess> Indeed
[12:50] <Darkside> ahh ok
[12:50] <Darkside> i'm at +11 )
[12:50] <TraumaPrincess> I figured :P
[12:50] <Darkside> and adelaide is +10.5 :P
[12:50] <Darkside> heh
[12:50] <fsphil> euuu... fractional offset
[12:51] <Darkside> oh shush
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[12:57] <m1x10> Hi all
[12:57] <m1x10> Link of the day: http://www.et3.com/ett.asp
[13:02] <TraumaPrincess> lol @ the photoshopped shadows
[13:07] <m1x10> TraumaPrincess: u r the TraumaPony?
[13:07] <TraumaPrincess> Yeah
[13:07] <m1x10> too much Traumatic nicknames
[13:07] <m1x10> :p
[13:08] <TraumaPrincess> lol
[13:10] <m1x10> Do u know what means Trauma ?
[13:13] <TraumaPrincess> ?
[13:13] <m1x10> what? --> ?
[13:13] <TraumaPrincess> wat
[13:21] <m1x10> nothing lol
[13:21] <m1x10> traumatic communication
[13:21] <m1x10> :p
[13:21] <TraumaPrincess> :P
[13:21] <m1x10> Trauma = wound
[13:22] <m1x10> So u r a wounded princess?
[13:22] <m1x10> :p
[13:22] <TraumaPrincess> Indeed
[13:23] <m1x10> and a wounded pony?
[13:23] <m1x10> why?
[13:24] <TraumaPrincess> 'cus
[13:26] <Laurenceb_> lol
[13:42] <m1x10> lool
[13:47] <Laurenceb_> the diydrones groundstation sw is looking nice
[13:48] <Laurenceb_> im tempted to try it
[13:49] <Laurenceb_> just a shame its underpowered
[13:52] <m1x10> Who knows where I can find power resistors?
[13:52] <m1x10> You power them and they provide heat
[13:57] <Randomskk> Laurenceb_: kicad's pcb editor is actually really really nice, just finished routing something with it
[13:58] <Randomskk> it does a lot that eagle should do
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[15:36] <Laurenceb_> neat
[15:37] Action: Laurenceb_ has been cooking lots of stew
[15:37] <Laurenceb_> Randomskk: think im finally going to get a reflow oven made
[15:37] <Randomskk> nice
[15:38] <Laurenceb_> http://www.food-lamps.co.uk
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[15:38] <Randomskk> neat
[15:39] <Laurenceb_> http://www.food-lamps.co.uk/products/full-assemblies-reflector-holder-bulb/full-assembly-300w-jacketed-quartz-bulb.html
[15:39] <Laurenceb_> ^ two of those in a hinged assembly, with wire gauze across the bottom to support the pcb
[15:40] <Randomskk> sounds like a fairly neat way to get the heat
[15:40] <Randomskk> cheap enough too
[15:40] <Randomskk> how'd you control it?
[15:40] <Randomskk> just on/off or some kind of variable control?
[15:40] <Laurenceb_> attiny with a thermocouple
[15:40] <Randomskk> how're you controlling the bulbs, I mean?
[15:41] <Randomskk> relay on/off?
[15:41] <Laurenceb_> so thermocouple - attiny with diff adc - triac optoisolator - triac - lamps
[15:42] <Laurenceb_> also a little 100ma transformer to run the attiny and lcd
[15:42] <Randomskk> fair enough
[15:42] <Laurenceb_> ive got a backlit lcd from sparkfun to use
[15:42] <Randomskk> sounds good
[15:42] <Randomskk> yea, those are neat
[15:42] <SpeedEvil> zero cross?
[15:42] <Laurenceb_> yep
[15:42] <Randomskk> with the serial backpack?
[15:43] <Laurenceb_> http://uk.farnell.com/hammond/1455n1602/enclosure-clear-black-end-plate/dp/4273035?Ntt=4273035
[15:43] <Laurenceb_> yes
[15:43] <Randomskk> sounds like it should be very neat
[15:43] <Laurenceb_> mounting it all in one of those, with one of the IR lamp modules sticking out the top
[15:44] <Randomskk> do those give out much light too?
[15:44] <Randomskk> nice box
[15:44] <Laurenceb_> i really want to add a fan - but cant find any 230v ones small enough
[15:44] <Laurenceb_> aiui they glow dim red
[15:44] <Randomskk> ah, okay
[15:44] <Randomskk> thinking you could use it as an exposure box too but probably you want some slightly different specs for that
[15:44] <Laurenceb_> people use similar for snake habitats etc
[15:45] <Randomskk> hmm these gebers from kicad look fine, do I risk getting seeed to make them
[15:45] <Laurenceb_> what it for?
[15:45] <Laurenceb_> *whats
[15:45] <Randomskk> just a side project, it's basically an atmega with six bright LEDs on headers, fet control thereof (all of them on PWM channels) plus a lipo with charging circuitry
[15:46] <Randomskk> https://randomskk.net/u/plight.pdf
[15:46] <Laurenceb_> noo flashing leds
[15:46] <Randomskk> :P
[15:47] <Laurenceb_> the only thing im wondering about is if an attiny can actually interface directly with a thermocouple
[15:47] <Randomskk> some can do it nicely
[15:47] <Randomskk> iirc
[15:47] <Laurenceb_> datasheet suggests yes, but ive never seen it done
[15:47] <Randomskk> others are trickier
[15:47] <Laurenceb_> you've seen it done?
[15:47] <Randomskk> technically I suppose I've heard of it done and been told it can be done
[15:48] <Laurenceb_> heh
[15:48] <Laurenceb_> i need to check my spare junk
[15:48] <Randomskk> http://microdrivers.net/2010/07/20/thermocuple-j-type-measuring-temperature/ maybe
[15:48] <Laurenceb_> i have a 3 pin 230v connector with on/off switch on the side thats panel monting iirc
[15:49] <Laurenceb_> thatd be nice in the side of the enclosure
[15:50] <Laurenceb_> i was going to avoid opamps entirely
[15:50] <Laurenceb_> just shove the thermocouple direct into the attiny
[15:50] <Laurenceb_> use 20x differential ADC mode
[15:52] <Laurenceb_> one thing i was worried about was overheating the enclosure, also if it can cool the pcb fast enough
[15:52] <Laurenceb_> hence adding a fan
[15:54] <Laurenceb_> alternatively - just stick the pcb on e.g. some rockwool and then put the lamp module upside down on top of it
[15:55] <Laurenceb_> 10bit adc, with ~1000mv ref voltage and 20x gain -> 50uV/LSB
[16:01] <SpeedEvil> that's what - 5C?
[16:01] <SpeedEvil> I forget
[16:01] <SpeedEvil> for K
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[16:03] <Laurenceb_> 1
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[16:05] <Laurenceb_> also you have a temp sensor giving you cold junction
[16:07] <Laurenceb_> attiny24
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[17:15] <Randomskk> well, pcb order placed from my first kicad design
[17:15] Action: Randomskk braces for impact in a few weeks
[17:16] <SpeedEvil> Good luck!
[17:16] <SpeedEvil> What's it?
[17:16] <Randomskk> the thing with the LEDs I asked you about controlling from before
[17:17] <SpeedEvil> ah
[17:17] <Randomskk> 15:45:51 <Randomskk> just a side project, it's basically an atmega with six bright LEDs on headers,
[17:17] <Randomskk> circuitry
[17:17] <Randomskk> fet control thereof (all of them on PWM channels) plus a lipo with charging
[17:17] <SpeedEvil> yeah - that
[17:17] <Randomskk> 15:45:51 <Randomskk> just a side project, it's basically an atmega with six bright LEDs on headers,
[17:17] <Randomskk> fet control thereof (all of them on PWM channels) plus a lipo with charging
[17:17] <Randomskk> ewww.
[17:17] <Randomskk> sorry.
[17:17] <Randomskk> silly irssi, I was just below its pasteguard limit
[17:17] <Randomskk> but yea, that
[17:17] <SpeedEvil> Sigh. My sleep-cycle is broken.
[17:17] <SpeedEvil> I woke up at 3:30
[17:17] <Randomskk> AM or PM?
[17:18] <SpeedEvil> PM
[17:18] <Randomskk> yea, that's not great, but eh
[17:18] <Randomskk> mine will go to about that if I don't have to wake up for anything
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[17:42] <MoALTz> are there any legal pitfalls for amatuar rocket engine developers? i know that you cannot prepare any solid propellants yourself (without an explosives licence) but i'm worried that i'm missing anything (i'd like to know so that i don't waste my time going up deadends)
[17:43] <russss> I believe as long as you're not dealing with solids then you're fine
[17:43] <MoALTz> ok
[17:44] <SpeedEvil> MoALTz: where are you?
[17:44] <MoALTz> uk
[17:44] <SpeedEvil> As I understand, yes, liquids are fine
[17:44] <SpeedEvil> I think you also need a fireworks factory licence ctually for solids.
[17:44] <SpeedEvil> But anyway.
[17:44] <SpeedEvil> You may have noise issues of course if you want to test them.
[17:44] <SpeedEvil> And you can't orbit anything :(
[17:45] <russss> well, you need a license for it
[17:45] <SpeedEvil> True.
[17:45] <russss> you do in the US as well I think
[17:45] <fsphil> launch it from the north sea
[17:45] <russss> I spotted this page the other day, not sure how long it's been around: http://www.ukspaceagency.bis.gov.uk/OSA+Licensing/11936.aspx
[17:46] <SpeedEvil> MoALTz: What sort of engine ar eyou attempting? Thrust?
[17:46] <MoALTz> SpeedEvil: any direct legal issues for orbiting (i know that this is extremely hard for multiple reasons). my understanding was that you'd require: CAA authorisation (hard), and home office notification (for UN space treaty)
[17:46] <SpeedEvil> yeah - outer space act
[17:46] <SpeedEvil> as above
[17:47] <SpeedEvil> Applying for a licence under the OSA is 6 grand
[17:47] <SpeedEvil> And that's just the application fee, it does not cover all costs
[17:47] <russss> plus I guess you need an OFCOM license for any radio frequencies you use
[17:47] <russss> you need £100m third party liability insurance
[17:47] <russss> not sure how much it costs to insure a rocket. Probably quite a lot.
[17:47] <SpeedEvil> Where is that figure from?
[17:47] <SpeedEvil> I don't recall seeing it
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[17:48] <Laurenceb_> launch from Mexico
[17:48] <MoALTz> russss: radio frequency stuff isn't criticial (i know this sounds niave but it isn't. there are things you can do without RF by yourself/from your own countrty)
[17:48] <SpeedEvil> Laurenceb: In principle, you can'.t
[17:48] <Laurenceb_> i have relatives in Cancun
[17:48] <russss> SpeedEvil: it says it on that page
[17:48] <Laurenceb_> simple :P
[17:48] <MoALTz> russss: yes, insurance is a big unknown, along with health&safety
[17:48] <SpeedEvil> Laurenceb: It's an extraterritorial act, like the various sex-related ones.
[17:49] <Laurenceb_> youd need to go down the coast and launch HAB from the beach maybe
[17:49] <MoALTz> SpeedEvil: interestingly, the hardest part of a liquid fuelled engine is... the oxidiser
[17:49] <SpeedEvil> Laurenceb: A UK citezen needs a licence if they control the launch, wherever it hapens on earth. In principle.
[17:49] <SpeedEvil> MoALTz: I found a source for 98%H2O2
[17:49] <MoALTz> SpeedEvil: no way of researching it without looking "dodgy"
[17:49] <Laurenceb_> take some self defence, lots of bandits :p
[17:49] <russss> well, Mexico is an Outer Space Treaty signatory so I would assume they would have approximately the same regulations.
[17:49] <MoALTz> SpeedEvil: H2O2 is mega-dodgy
[17:49] <Laurenceb_> asin?
[17:49] <Laurenceb_> as in how is it dodgey?
[17:50] <MoALTz> Laurenceb: you'd get looked as terrorist basically
[17:50] <Laurenceb_> haha well yes
[17:50] <SpeedEvil> http://www.peroxidepropulsion.com/
[17:50] <Laurenceb_> but it is obtainable
[17:50] <SpeedEvil> meh
[17:50] <Laurenceb_> so who cares
[17:50] <SpeedEvil> above source has gone away
[17:50] <SpeedEvil> liquid oxygen is also more-or-less doable
[17:50] <Laurenceb_> unless you are on the underground you are unlikely to get 7 bullets in the head
[17:50] <SpeedEvil> And not terribly bad
[17:50] <MoALTz> Laurenceb: obtainable. only useful if you enrich. if you enrich then you'll get some hefty attention :P
[17:51] <Laurenceb_> vacuum distillation isnt hard
[17:51] <SpeedEvil> You can get explosions of vapour
[17:51] <SpeedEvil> which makes it more fun
[17:51] <MoALTz> as i said, oxidisers are hard
[17:52] <Laurenceb_> i looked at doing n prize with off the shelf solid reloads
[17:52] <SpeedEvil> liquid O2 is moderately easy to obtain
[17:52] <Laurenceb_> not imposible
[17:52] <Laurenceb_> use cesaroni reloads, two stage spin stabilised
[17:52] <MoALTz> would like to make my own liquid engines... but i'd rather not have to do something equivilent to a firearms registration to do so =/
[17:52] <SpeedEvil> It's annoying from a storage and testing POV though
[17:54] <Laurenceb_> liquid oxygen has an annoying habit of boiling away
[17:54] <SpeedEvil> yes
[17:55] Action: Laurenceb_ remembers when he took the mini rogallo on the underground
[17:55] <Laurenceb_> that probably could have nded badly
[17:56] <Randomskk> you terrorist
[17:56] <Randomskk> tsk tsk
[17:56] <Laurenceb_> suspicious person with big cardboard box and lots of wires hanging out
[17:56] <MoALTz> sigh
[17:57] <Laurenceb_> prob best not to try that with canisters of H2O2
[17:57] <SpeedEvil> The choices are really quite limited if you're in general opposed to stuff that's carcinogenic, mutagenic, tetragenetic, explodes randomly, decomposes accidentally, or boils off.
[17:58] <Laurenceb_> by those standards peroxide is fairly goosd
[17:58] <SpeedEvil> Does that actually leave any oxidiser at all?
[17:58] <Laurenceb_> nope
[17:58] <SpeedEvil> Peroxide is a bit annoying from a material compatibility POV
[17:58] <Laurenceb_> yes
[17:58] <SpeedEvil> Oh - yes - gaseous oxygen is left
[17:58] <MoALTz> `23
[17:59] <MoALTz> sorry, was my cat
[17:59] <SpeedEvil> You're not intereste in rocketry then?
[18:00] <russss> heh
[18:00] <MoALTz> just not interested in "`23"
[18:00] <SpeedEvil> ah
[18:00] <Laurenceb_> very intelligent conversation for a cat
[18:01] <Laurenceb_> i dunno about rockets... off the shelf reloads are attractive in some ways
[18:01] <Laurenceb_> but they burn fast and its still complex to make a motor
[18:02] <MoALTz> if the cat was talking about sodium or vanadium
[18:02] <Laurenceb_> if you want to do anything interesting with the "high power rocketry" motors without custom cases you might as well give up
[18:03] <MoALTz> i don't want to touch solids
[18:03] <Laurenceb_> heh
[18:03] <MoALTz> hybrids is a big maybe. liquids is my interest :)
[18:03] <Laurenceb_> i like speedevils electroformed nozzle idea
[18:04] <Laurenceb_> that might be a good place to start
[18:04] <Laurenceb_> hybrids dont seem that good to me - one design i did find was an inverse hybrid using propane and frozen peroxide
[18:04] <SpeedEvil> neat
[18:05] <Laurenceb_> thats been done by a german team, and the performance is good
[18:05] <Laurenceb_> also easyish propellant
[18:05] <Laurenceb_> you need additives to opacify the peroxide ice
[18:05] <MoALTz> sounds like an enhanced monopropellant
[18:06] <Laurenceb_> the typical nitrous hybrids are atrocious from an ISP point of view
[18:06] <MoALTz> interesting sounding problem though
[18:06] <Laurenceb_> lox hydrids as well, but cryo propellant
[18:06] <SpeedEvil> I have a paper rocket - I was flipping between LOX/kero, and H2O2/alcohol
[18:06] <Laurenceb_> with the propane H2O2 ice you can use carbon fibre tube
[18:06] <SpeedEvil> they both have different problems
[18:06] <MoALTz> SpeedEvil: quite a flip
[18:07] <Laurenceb_> PET 2L bottles make amazingly good pressure vessles btw
[18:07] <SpeedEvil> yeah
[18:08] <Laurenceb_> a 2L bottle with electroformed regen nozzle buring H2O2/alchol and a spin stabilised upper stage could do orbit
[18:08] <SpeedEvil> I noticed that way back, doing some numbers for stupid pressure fed '0th' stage boosters
[18:08] <Laurenceb_> sounds totally mad but its true
[18:08] <Laurenceb_> - launc from HAB at 33Km
[18:09] <SpeedEvil> Get sponsorship from coke, and do it!
[18:09] <SpeedEvil> :)
[18:10] <Laurenceb_> the upper stage would be really small - ~120grams lift off mass, so the burnt out stage youd be the sat
[18:11] <Laurenceb_> but anyway the n prize is totally daft
[18:12] <MoALTz> yep
[18:13] <Laurenceb_> well, the idea is good, but the reusability and items t be added to the cost list rules totally ruin it
[18:13] <MoALTz> hard part: getting to orbit. far harder part: proving that you got there (for 8 orbits == ++harder)
[18:13] <Laurenceb_> 8 orbits thats not too hard
[18:13] <Laurenceb_> once you have orbit
[18:14] <MoALTz> it's not hard. however, trying to track something doing that....
[18:14] <Laurenceb_> easy with ism band transceivers
[18:14] <Laurenceb_> not much harder than what we do with balloons
[18:14] <MoALTz> *not hard compared to launching it
[18:15] <Laurenceb_> thats the easy part - even the incompetent nutters who have done some n prize work (sorry folks) have managed to get that far already
[18:16] <Laurenceb_> several teams have built credible payloads
[18:16] <MoALTz> i really don't think so. you're highly likely to have your launch disappear with no trace (and no clue on what failed)
[18:16] <SpeedEvil> yeah
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[18:16] <SpeedEvil> I did a back-of-the-envelope one for slashdot
[18:17] <MoALTz> i'd rather alert the US and/or russia to the launch, plan something that unfolds into having a huge radar signature
[18:17] <MoALTz> easier, and you have more clue to what happens if anything goes wrong
[18:17] <SpeedEvil> Couple of tiny solar cells back-back, tiny polystyrene structure, li-ion, 433MHz tranciever, STM32 based computer with SD and camera, and tiny magnetorquer
[18:18] <Laurenceb_> Ti have chipcon transceivers with inbuilt msp430 now
[18:18] chris_99 (~chris_99@unaffiliated/chris-99/x-3062929) got netsplit.
[18:19] <Laurenceb_> brb
[18:22] <Randomskk> https://randomskk.net/u/plight.png yay kicad's 3d rendering
[18:29] chris_99 (~chris_99@unaffiliated/chris-99/x-3062929) got lost in the net-split.
[18:34] <Laurenceb_> sweet
[18:34] <Laurenceb_> just dug out my numbers of H2O2 inverse hybrid
[18:35] <Laurenceb_> turns out it works really well as the high density of the ice more that compensates for the hole down the middle
[18:35] <MoALTz> preparing h2o2.... sigh
[18:35] <Laurenceb_> also it can use carbon firbe for everything
[18:35] <Laurenceb_> also, use lithium polymer cells to run a heater in the propane tank
[18:36] <Laurenceb_> use boiloff to vary the pressure
[18:36] <MoALTz> Laurenceb: is there any cracks during engine operation? (h2o2 ice would probably be unstable in engine operation and fracture)
[18:36] <MoALTz> (although, ironically, i am reading about h2o2 safety atm... not finished yet...)
[18:36] <Laurenceb_> finally, use dry ice to keep the launch holder thingy cool during HAB ascent
[18:36] <Laurenceb_> aiui you use fibre based additives
[18:37] <Laurenceb_> its frozen in the carbon fibre tube - outside in
[18:37] <Laurenceb_> theres a little bit of info on this technique avaliable... google
[18:38] <Laurenceb_> i cant really rememeber, but theres a german team sponsored by esa that made a working engine
[18:39] <Laurenceb_> designing hybrids properly is pretty hard - not sure if theres enough data freely avaliable on this design to get it right first time
[18:40] <Laurenceb_> regression rates etc
[18:41] <Laurenceb_> Randomskk: where are the 3d models for the switches rom?
[18:41] Action: Randomskk made the switch, pot, dc jack and lipo connector models
[18:41] <Randomskk> in wings3d
[18:41] <Laurenceb_> ah, well done
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[18:53] <m1x10> Adam Creig: Kicad can do 3D ?
[18:54] <Randomskk> probably 'randomskk' is better, being both correct and highlightable
[18:55] <Randomskk> kicad has a native 3d renderer for boards, yes
[18:57] <Laurenceb_> http://en.wikipedia.org/wiki/ALICE_%28propellant%29
[18:58] <Laurenceb_> orogional german page with the details of the H2O2 ice hybrid construction seems to have gone :(
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[19:04] <MoALTz> can be recovered if you know the dates
[19:04] <MoALTz> *that it existed on
[19:04] <m1x10> Randomskk: :0
[19:04] <m1x10> Randomskk: :)
[19:04] <Laurenceb_> hmm cant remeber... too many bookmarks
[19:04] <m1x10> Randomskk: maybe I should start using it
[19:05] <SpeedEvil> I have setup in the past wwwoffled to act as a persistant proxy-cache
[19:06] <SpeedEvil> Cache everything you ever look at on the web
[19:06] <SpeedEvil> It's a hell of a lot easier to run a search engine over
[19:07] <Laurenceb_> yeah
[19:08] <Laurenceb_> all i can remeber is its somewhere in germany - they didnt have a lot of info
[19:08] <Laurenceb_> but itd be worth firing some email off to them
[19:09] <Laurenceb_> steel tube with solid H2O2 + opacifiers and fibre additives frozen in place, then standard propane cylinders to feed it from one end
[19:10] <Laurenceb_> iirc they tried some off the shelf plastic fibre stuff i dont thing paper fibre works as its too unstable in HTP
[19:10] <MoALTz> depending on the peroxide %age that's practically a solid rocket motor...
[19:11] <Laurenceb_> heh
[19:11] <Laurenceb_> aiui it wasnt capable of self sustaining combustion
[19:11] <MoALTz> good
[19:12] <Laurenceb_> but close
[19:13] <SpeedEvil> You mean not capable of sustaining as a solid - but worked as a hbrid?
[19:13] <Laurenceb_> yes
[19:13] <Laurenceb_> additives as a mass fraction were a few %
[19:14] <Laurenceb_> then 15% propane or something
[19:22] <MoALTz> Laurenceb: something i found the other day http://www.gkllc.com/lit/gk-authored/AIAA-2007-5468_Hydrogen_Peroxide_Myths.pdf
[19:22] <MoALTz> (yes, it really was dissed that much in Ignition!)
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[19:39] <Laurenceb_> interesting
[19:39] <SpeedEvil> ""
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[20:51] <Lunar_Lander> hello
[20:53] <SpeedEvil> hello
[20:53] <Lunar_Lander> how's life?
[20:55] <m1x10> Hello
[20:55] <Lunar_Lander> hi m1x10
[21:02] <m1x10> I came with a thought today
[21:02] <m1x10> Because I can't fit all my components in one pcb area
[21:03] <m1x10> to make a 2nd board like daughterboard to the first
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[21:05] <Lunar_Lander> nice idea
[21:17] <m1x10> but will cost twice :(
[21:19] <Lunar_Lander> yeah
[21:19] <Lunar_Lander> damn
[21:19] <Randomskk> or you could just use smaller components and work harder to fit htem in
[21:20] <m1x10> Randomskk, I did my best but I cannot fit them all
[21:20] <Randomskk> try harder :P are you using all surface mount parts?
[21:20] <m1x10> Im lacking a whole 5x5cm area
[21:20] <m1x10> its too much
[21:20] <m1x10> I use mostly breakout
[21:20] <m1x10> brekaouts
[21:20] <m1x10> breakouts
[21:20] <m1x10> :p
[21:21] <Randomskk> that would probably explain why
[21:21] <Randomskk> don't use any breakouts :P
[21:21] <m1x10> yes
[21:21] <Randomskk> you're making your own pcb, no need
[21:21] <m1x10> but I dont know SMD soldering
[21:22] <m1x10> and I dont have money to buy again all the sensors and stuff alone
[21:22] <m1x10> and I want to have modular design
[21:22] <m1x10> for reusability
[21:22] <Randomskk> eh well
[21:22] <Randomskk> you're paying for it
[21:22] <Randomskk> use seeed studio, order 10cm by 10cm PCBs
[21:22] <m1x10> yeah I do from them
[21:23] <m1x10> 40$
[21:23] <Randomskk> yea
[21:23] <Randomskk> oh, but that's still 5cm by 5cm too small?
[21:23] <Randomskk> blimey. try harder :P put stuff on both sides
[21:23] <m1x10> I sent them mail to ask if its possible to do 2 individuals boards 5 pieces each
[21:23] <m1x10> at same price
[21:24] <m1x10> but im expecting a negative answer
[21:25] <m1x10> Still, stuff cannot go both sides. I got too many traces here and there :(
[21:26] <m1x10> I'll use the pancake method like doing shield
[21:27] <m1x10> I will have the main flight system - radio, gps, microSD, power stuff - as one board
[21:27] <Lunar_Lander> yea
[21:27] <Lunar_Lander> and radio is another one?
[21:28] <m1x10> and i will have the 2nd board as a 'goodies' board. - Sensors, imaging, servos etc... -
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[21:29] <m1x10> Lunar_Lander: My radio is part of the main flight system
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[21:29] <Lunar_Lander> ah
[21:29] <Lunar_Lander> I am planning my science recorder and the radio + GPS is seperate
[21:29] <m1x10> hehe
[21:30] <m1x10> different ppl different ideas :)
[21:30] <m1x10> Im also thinking of adding extra battery holders on the goodies board
[21:32] Nick change: The-Compiler -> Compiler^27c3
[21:32] <Lunar_Lander> yeah
[21:35] <m1x10> I heard its too cold in central and north EU
[21:35] <m1x10> Here is now ok
[21:35] <m1x10> We have about +12C for days now
[21:38] <Laurenceb_> me is getting annoyed by i2c
[21:38] <Laurenceb_> trying to talk to a lis302dlh with bus pirate
[21:38] <Randomskk> aww. i2c is fun
[21:38] <Laurenceb_> its not allowing me to read registers for some reason - no ack to slave read
[21:39] <Laurenceb_> im just telling the bus pirate to do i2c start
[21:39] <Laurenceb_> wondering if rep start is somehow different
[21:40] <Laurenceb_> its weird - its works ok for writing all the registers, then when i try to set it up for reading its wont respond
[21:41] <Lunar_Lander> I've +6 now
[21:45] <Laurenceb_> doubly odd thing - if i do an address search the read address shows up
[21:47] <Lunar_Lander> http://www.youtube.com/watch?v=52yNSz1BKAk
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[22:14] <Lunar_Lander> night
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[23:05] <Laurenceb_> stupid bus pirate
[23:05] <Laurenceb_> its chucking out random nonsense
[23:06] <Laurenceb_> working no
[23:06] <Laurenceb_> *now
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[23:31] <Laurenceb_> http://i.imgur.com/rjzAy.png
[23:32] <Laurenceb_> the internal high pass is interesting - everything ->0 at the start of the plot
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[00:00] --- Tue Dec 28 2010