highaltitude.log.20111007

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[01:51] <jcoxon> Morning
[01:52] <SpeedEvil> Morning.
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[01:52] <jcoxon> SpeedEvil, you have a crazy sleep pattern
[01:53] <SpeedEvil> I've not gone to bed yet.
[01:53] <SpeedEvil> And regrettably.
[01:53] <SpeedEvil> I slept a few hours last eveing.
[01:53] <SpeedEvil> I take it you're being compelled to get up at this time?
[01:54] <jcoxon> Hehe I'm on nights
[01:54] <jcoxon> So paid to be up
[01:55] <SpeedEvil> Dealing with people getting 'tired and emotional' and falling over in the street, or ward-based?
[01:56] <jcoxon> Both
[01:56] <jcoxon> Mainly old men in urinary retention
[01:58] <SpeedEvil> I see. The body is an amazing system. Till it isn't anymore.
[01:59] <jcoxon> :)
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[07:47] <UpuWork> morning
[07:47] <jcoxon> morning
[07:47] <UpuWork> about jcoxon or going to bed ?
[07:47] <UpuWork> oh hi :)
[07:48] <UpuWork> Got 5 mins or heading off ? its not urgent just about the streaming for the conference
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[07:49] <UpuWork> those of you who ordered antennas off me there are San Francisco : http://www.dhl.com/content/g0/en/express/tracking.shtml?brand=DHL&AWB=7126979020%0D%0A
[07:49] <UpuWork> there=they
[07:49] <fsphil> lucky them
[07:50] <UpuWork> morning fsphil
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[07:52] <fsphil> hiya UpuWork
[07:52] <jcoxon> UpuWork, well bed soon
[07:52] <jcoxon> can chat for 5
[07:52] <jcoxon> actually will be up for another 30mins or so i suspect
[07:52] <fsphil> jcoxon, been meaning to ask- did you get anything done with that android thingy you got?
[07:58] <jcoxon> fsphil, i'm not sure what you mean
[07:58] <jcoxon> the android tablet?
[07:58] <jcoxon> if so they yes i did something - managaed to royally brick it
[07:58] <fsphil> uh-oh
[07:58] <jcoxon> might be fixable but haven't got round to it
[07:58] <jcoxon> as i've got serial access
[07:58] <jcoxon> its a shame as i miss angry birds
[07:58] <jcoxon> i'm not sure about android tablets - i wish they were more hackable
[07:58] <jcoxon> i'd love to actually install linux
[07:58] <jcoxon> instead
[07:58] <fsphil> yea a real linux
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[08:13] <nosebleedKT> hi all
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[08:15] <griffonbot> Received email: Anthony Stirk "[UKHAS] UKHAS Conference Streaming"
[08:20] <GW8RAK> An essential part of HAB'ing perhaps? http://uk.autoblog.com/2011/09/30/aquatic-caravan-ready-to-cause-north-sea-tailbacks/
[08:22] <fsphil> oooh
[08:23] <fsphil> not sure I'd want to be in choppy waters with it though
[08:23] <griffonbot> Received email: "Re: [UKHAS] UKHAS Conference Streaming"
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[08:39] <nosebleedKT> question. someone told me that copper pour (ground plane) might break on very low temp. Is that true?
[08:42] <fsphil> never heard of it happening
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[08:45] <GW8RAK> A quick Google shows that strength and ductility increase at low temperatures, i.e. it doesn't become brittle.
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[08:57] <nosebleedKT> ok
[08:58] <nosebleedKT> actually he didnt say 'break'. He said it might start changing shape
[08:59] <Darkside> never happened to me
[08:59] <nosebleedKT> yea
[08:59] <Darkside> my micronut board was sitting at -25 for about 12 hours and didnt die
[08:59] <nosebleedKT> fsphil: did you manage to add a wide-angle lens on our jpeg cam?
[09:00] <nosebleedKT> ./me jealous :)
[09:00] <GW8RAK> The ground plane won't be heavy enough to deform under it's own weight. The ground plane only needs to be 3 or more wires
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[09:12] <fsphil> nosebleedKT, the camera came with a wide angle lens
[09:13] <fsphil> though it is replaceable
[09:25] <nosebleedKT> fsphil the one from sparkfun?
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[09:38] <fsphil> nah the one from cool components (4d systems)
[09:40] <nosebleedKT> how to know if my jpeg cam got wide lens?
[09:42] <fsphil> take a picture :)
[09:42] <fsphil> if it's got a big lens then it'll probably be fairly wide
[09:42] <fsphil> but if you take a picture you can measure it
[09:48] <nosebleedKT> you know my pictures. I have sent you many times.
[09:49] <costyn> nosebleedKT: does it have any specifications in millimeters? anything between 10 and 30 is wide, 30 and 50 is 'normal', 50 is close to what the human eye sees, anything above 50mm is considered zoom
[09:49] <nosebleedKT> http://imagebin.org/177801
[09:51] <nosebleedKT> http://www.sparkfun.com/products/10061
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[09:59] <nosebleedKT> btw, i figure out that if you place vias underneath the big mcu gap many things get simpler
[10:02] <fsphil> are you using eagle?
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[10:05] <nosebleedKT> diptrace
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[10:13] <griffonbot> Received email: Spike (Chris Foote) "Re: [UKHAS] UKHAS Conference Streaming"
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[10:41] <UpuWork> I have alot of uBlox modules here
[10:41] <UpuWork> hope you all have steady hands
[10:41] <SpeedEvil> :)
[10:42] <Darkside> oh you got them?
[10:42] <SpeedEvil> They don't fit into breadboards?
[10:42] <Darkside> SpeedEvil: they are raw NEO-6Q modules
[10:42] <Darkside> UpuWork: hows your breakout coming?
[10:42] <SpeedEvil> :)
[10:42] <Darkside> SpeedEvil: http://rfhead.net/data/uBloxBreakout/breakout_top.JPG
[10:43] <Darkside> he has some of the modules in the centre
[10:43] <SpeedEvil> That's quite small!
[10:43] <x-f> width: 444px;
[10:43] <x-f> height: 310px;
[10:43] <x-f> sorry!
[10:44] <UpuWork> hey Darkside
[10:44] <UpuWork> got a min PM ?
[10:44] <Darkside> sure
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[10:45] <NigeyS> now then who can i bribe to solder them for me..lol
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[10:49] <costyn> nosebleedKT: I can't find anything about the lens, sorry; I guess you'll have to use fsphil's method to measure the angle; looking at your picture it looks a bit to the wide side, but not much
[10:50] <UpuWork> http://imagebin.org/177812
[10:51] <NigeyS> bloodyhell
[10:52] <costyn> that is tiny :)
[10:52] <fsphil> I can tell I'm going to enjoy soldering these
[10:53] <Darkside> fsphil: i'm still more than happy to sell the ones people have already expressed interest in
[10:53] <Darkside> i.e. fully assembled breakout boards
[10:53] <costyn> So i've just hooked up my DS18S20 to my arduino and am running the sample code. It seems the reported temperature is off by a factor of 10, reporting 2.56 instead of (more likely 25.6); anyone have this before?
[10:54] <costyn> Darkside: yes, I'm still interested in fully assembled ones :)
[10:54] <Darkside> UpuWork: i presume you won't need the one that you asked me for?
[10:54] <UpuWork> Yes please send it on
[10:55] <Darkside> bah :P
[10:55] <UpuWork> Be nice to have a known working one :)
[10:55] <Darkside> i was going to send you a blank PCB and some antennas
[10:55] <Darkside> :P
[10:55] <NigeyS> lol
[10:55] <Darkside> then you can practice soldering!
[10:55] <Darkside> :P
[10:55] <UpuWork> I'm not soldering it :)
[10:55] <Darkside> >_>
[10:55] <Darkside> ugh
[10:55] <UpuWork> I employ people who are much better at it than me
[10:55] <Darkside> i need to make up a test jig
[10:56] <Darkside> like, a bit of veroboard with a pin header i can 'hang' the boards on
[10:56] <UpuWork> We have an engineer who repairs laptops he's pretty handy with the soldering iron
[10:56] <Darkside> i plan on shipping these with no pin headers on them
[10:56] <Darkside> so you can decide what you want to do with that part yourself
[10:57] <UpuWork> ok
[10:58] <Darkside> some people might want a keyed socket
[10:58] <Darkside> some people might just want a normal pin header
[10:58] <Darkside> etc
[10:58] <Darkside> and thats a bit hard to customize
[10:58] <costyn> sounds good
[10:59] <Darkside> but yeah, i'll have them all tested
[10:59] <Darkside> basically i'll make up a bit of veroboard where i can plug in a 3.3v UART adapter and have a LED
[10:59] <Darkside> andi'll make sure it gains lock and responds to commands
[11:00] <Darkside> hell, i can do that test by wiring it up to one of my old mininut boards, as they do all teh flight mode stuff
[11:05] <fsphil> Darkside, when soldering smd stuff do you use some kind of magnifier to see it better?
[11:09] <Darkside> not with the ublox modules
[11:09] <Darkside> wel
[11:09] <Darkside> i use a magnifier to inspect it after its soldered
[11:10] <Darkside> to check for solder bridges, etc
[11:12] <nosebleedKT> I have two power sources. A 4.5v and a 3.7v. How can I do it that the circuit will automatically switch on the higher voltage source? (without a chip)
[11:21] <nosebleedKT> Is it that hard? :p
[11:23] <fsphil> yep :)
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[11:25] <nosebleedKT> oh !
[11:26] <UpuWork> there is FT790 on Tea Leaf bay at the moment for £26.00
[11:26] <UpuWork> http://www.ebay.co.uk/itm/130583732960?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
[11:26] <fsphil> maybe not - I'm not that good with electronics to say :)
[11:35] <UpuWork> Epic, we've had this monk looking guy who's been walking round Bradford for years , i remeber waving at him as a kid
[11:35] <UpuWork> http://www.thetelegraphandargus.co.uk/news/9194596.Almost_23_000_back__Jesus_Man__Olympic_torch_bid/?ref=ms
[11:35] <UpuWork> and now people are actively tracking him at http://bradfordjesusman.co.u
[11:35] <UpuWork> he used to wave back but he's a miserable sod now
[11:46] <Laurenceb> what the heck
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[12:51] <GW8RAK> I know that some people have played with Peltier cooling devices in the past. I'm looking for about -20C across a 15cm *15cm plate. Would this be feasible without too much expenditure?
[12:53] <Randomskk> do you mean 20C difference
[12:53] <Randomskk> or -20C temperature
[12:53] <Randomskk> not that it makes a huge amount of difference. it should be doable and without much expense at all but you will need to cool the hot side fairly well
[12:54] <GW8RAK> -20C absolute
[12:54] Action: Laurenceb has arduino code compiling on Dactyl
[12:54] <Laurenceb> not sure if this is good or bad
[12:54] <GW8RAK> Just looking on ebay. Does the hot side get coupled to a heat sink and then fan cooled?
[12:56] <GW8RAK> Found one 50mm square taking 26A!
[13:01] <W0OTM> howdy howdy
[13:06] Dan-K2VOL (~Adium@74-143-44-42.static.insightbb.com) joined #highaltitude.
[13:16] <W0OTM> Howdy Dan-K2VOL
[13:17] <Dan-K2VOL> morning marshall
[13:17] <W0OTM> Dan-K2VOL: whats the good word?
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[13:17] <Newbz> Afternoon
[13:18] <W0OTM> Newbz: howdy
[13:18] <Dan-K2VOL> valves
[13:18] <Dan-K2VOL> one-way valves
[13:18] <W0OTM> Dan-K2VOL: cool! pressure realse?
[13:18] <Dan-K2VOL> yep
[13:18] <W0OTM> Dan-K2VOL: very nice. I was thinking about those this week for some reason
[13:18] <Dan-K2VOL> we're replicating the japanese paper balloon release valves to retrofit our global western zero pressure balloons
[13:19] <W0OTM> Dan-K2VOL: interested in seeing what you came up with
[13:19] <Dan-K2VOL> they're very simple, just a 3 leg tripod supporting a free spring, which has a big plate on top
[13:19] <Dan-K2VOL> and the plate has a sheet of silicone rubber across it
[13:20] <Dan-K2VOL> about 9"in diameter for ours
[13:20] <Dan-K2VOL> the tripod is inverted of course
[13:20] <Newbz> This about the balloon on the tracker now?
[13:20] <Dan-K2VOL> no
[13:20] <Dan-K2VOL> just about some work we're trying now in the white star group
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[13:23] <Newbz> I should be getting my Arduino this weekend, can start playing with that :)
[13:23] <Newbz> £20 seem about right for an Uno?
[13:23] <Dan-K2VOL> yay
[13:23] <Dan-K2VOL> hmm probably
[13:24] <Dan-K2VOL> heh looks like Bill Brown is flying on spacenear
[13:24] <Newbz> going to do some basic LED stuff first, then down the line get the NTX-2 (I think that's it's name) and practice using that
[13:24] <Dan-K2VOL> or ground testing
[13:24] <UpuWork> yeah sounds about right Newbz
[13:25] <UpuWork> get the NTX2 making a high and low tone first
[13:25] <Newbz> I found a tutorial through the wiki I think it was that goes through the high/low tone test
[13:25] <Newbz> only prob is getting the radio,
[13:26] <UpuWork> yep good article that I hear the author is amazing and very sucessful with women
[13:26] <Newbz> need to find a local HAM club and see if they can help :)
[13:26] <UpuWork> http://www.ebay.co.uk/itm/130583732960?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
[13:26] <Dan-K2VOL> haha
[13:26] <Newbz> :-o
[13:27] <Newbz> that is cheap :)
[13:28] <UpuWork> I think it should do the trick
[13:28] <UpuWork> but check with others here first
[13:28] <Newbz> is it SMB mode that is needed?
[13:28] <UpuWork> USB
[13:28] <Newbz> bit of a guess, can't remember exactly
[13:28] <Newbz> ah USB :-p
[13:28] <costyn> SSB?
[13:29] <Newbz> I have been reading up, too many acronyms!!
[13:29] <costyn> :)
[13:29] <costyn> SMD, SMB, SSD, SSB, SD, USB etc etc :)
[13:30] <Zuph> LSB, CW, RTTY, TLA, FAA, ICAO. If there's one thing engineers love, it's acronyms.
[13:31] <Zuph> Sometimes I think up three acronyms before breakfast.
[13:31] <costyn> Zuph: otherwise it would make all our conversations last 3 times as long, and that's inefficient, and if there's one thing engineers hate, it's inefficiency :)
[13:31] <Dan-K2VOL> I think it's more of an american pastime, what say you non-americans
[13:31] <UpuWork> I say GO USA
[13:31] <Zuph> Acronyms lend legitimacy to even the most trivial of pursuits!
[13:32] <UpuWork> My boss once told me PCMCIA meant People can't reMeber computer industry acronyms
[13:33] <Newbz> People Can't Memorise Computer Industry Acronyms :)
[13:33] <UpuWork> thats it
[13:33] <UpuWork> mine you the wife who's a vet has some belters : DIMITO Dog is more intelligent than owner
[13:34] <UpuWork> TFBUNDY totally f?cked but unfortunately not dead yet
[13:34] <costyn> haha dimito :)
[13:35] <Newbz> lol
[13:36] <costyn> my wife works in a gov't ministry and when she talks to her collegue/friend their conversation is loaded with acronyms too, so I think it's not computer industry specific :)
[13:36] <costyn> nor country specific
[13:36] <Newbz> http://g0gvc.tripod.com/id22.html
[13:36] <Newbz> looks like it fits the bill
[13:37] <UpuWork> yep
[13:37] <Dan-K2VOL> I feel like I hear more word shortening in the UK where in the US an acronym would be made instead though
[13:38] <Dan-K2VOL> like Lib Dems
[13:38] <Newbz> does the antenna need to be specific (expensive) or will any old thing do?
[13:39] <UpuWork> for testing just a rubber whip thing should be good
[13:39] <Zuph> Hah, an American "LD" party would give Fox News plenty of pun fodder.
[13:40] <UpuWork> you could make an antenna
[13:40] <Newbz> ah ok
[13:40] <Newbz> hmmmm
[13:40] <Newbz> might have some purchases to sneak past the other half this weekend.....
[13:41] <Zuph> Sneaky balloon related purchases are the best sneaky purchases.
[13:42] <UpuWork> Oh I constantly get in trouble
[13:42] <Newbz> I'm thinking a crafty bid on that radio and an Arduino purchase :)
[13:42] <Dan-K2VOL> oh hey, I heard about the naked scientists 'so you want to be a scientist' winner, a lady who tested out snails to see if they have a homing instinct, and found that they do, for a fairly long distance
[13:42] <Dan-K2VOL> I was thinking of embedding RFID chips inside them for secret message passing
[13:42] <UpuWork> in snails ?
[13:42] <Dan-K2VOL> yes!
[13:42] <UpuWork> interesting
[13:42] <UpuWork> You'll be a hoot at parties
[13:43] <UpuWork> :)
[13:43] <Dan-K2VOL> hahaha here pretty girl, pet my snails
[13:43] <UpuWork> it would be way cooler to some how bioengineer it so you can remote control the snail
[13:43] <Dan-K2VOL> ooh now that would
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[13:44] <Dan-K2VOL> though fairly slow response rate
[13:44] <Zuph> I would love to get some biohacking gear at the space.
[13:44] <Dan-K2VOL> I think you'd get tired of holding the TURN RIGHT button
[13:44] <Zuph> Heh, never underestimate the bandwidth of an army of snails carrying flash drives?
[13:45] <Dan-K2VOL> I mean they''re used to hauling a load around
[13:48] <UpuWork> Newbz
[13:49] <UpuWork> You can get one of these too I believe :
[13:49] <UpuWork> http://www.funcubedongle.com/
[13:49] <UpuWork> £125.34 inc VAT
[13:50] <costyn> UpuWork: this is relevant to my interests
[13:51] <Newbz> That looks handy
[13:51] <Newbz> Does anyone have experience with them?
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[13:53] <costyn> someone on here uses one, can't remember who though. And I guess funcube will talk to dl-fldigi no problem?
[13:55] <Newbz> Or you could run a 3.5 mil jack from your speaker output straight to you line in or mic input
[13:55] <Newbz> I think... lol
[13:56] <Darkside> the funcube dongle appears a a usb sound card and a usb HID device
[13:57] <Darkside> yes, dl-fldigi can just use the sound card directly
[13:57] <costyn> aha ok cool
[13:57] <Darkside> and you tune the funcube dongle using another program (maybe fldigi can do it now, not sure)
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[14:00] <Dan-K2VOL> though funcube provides the signal not quite like normal audio - it gives you the I and the Q as Left and Right audio channels
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[14:03] <costyn> ok, and the funcube is sensitive enough to recieve the ntx2 when it's at ±35KM ?
[14:04] <Dan-K2VOL> its meant to receive satellites in orbit
[14:04] <Dan-K2VOL> nanosats
[14:04] <Dan-K2VOL> you just need a proper antenna
[14:04] <costyn> ok good to know
[14:08] <griffonbot> Received email: David Bowkis "Re: [UKHAS] UKHAS Conference Streaming"
[14:08] <Darkside> the funcube dongle isn't the most sensitive receiver
[14:08] <Darkside> but it does work
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[14:22] <SamSilver> jcoxon: hi do you have sunshine?
[14:23] <jcoxon> nah
[14:23] <SamSilver> bugger
[14:26] <jcoxon> its okay
[14:32] <number10> hail stones and thunder here
[14:32] <SamSilver> stunning african day here time for sundowners on the stoep
[14:32] <SamSilver> verhanda = stoep
[14:33] <SamSilver> to hell with spelling it is time for a gin!
[14:33] <jcoxon> SamSilver, i suspect my solar payload would do better down south
[14:33] <number10> nice - i have to mop up the water thats come under the door as the gutters cant cope
[14:34] <SamSilver> I get over 300 days sunshine
[14:35] <daveake> We get that many too. Not every decade, mind, but most.
[14:35] <SamSilver> jcoxon: I am working on a valve for venting made out of antifreeze as the sealing ring
[14:36] <SamSilver> but my thinking is flawed
[14:36] <jcoxon> SamSilver, have you seen the japanses paper valves that Dan-K2VOL posted a video of
[14:36] <jcoxon> ?
[14:36] <Dan-K2VOL> samsilver, be sure you test it at cold temperatures
[14:36] <Dan-K2VOL> antifreeze turns very sticky in the cold
[14:37] <SamSilver> should I lookunder youtube?
[14:37] <jcoxon> http://www.archive.org/details/gov.archives.arc.13084
[14:37] <Dan-K2VOL> thanks jcoxon
[14:38] <jcoxon> Dan-K2VOL, awesome video
[14:38] <SamSilver> thanx
[14:38] <Dan-K2VOL> it is a fascinating analysis isnt it!
[14:38] Nick change: sofii-chan -> spacekitteh
[14:38] <SamSilver> I was also thinking of twisting the neck of the latex balloon
[14:38] <SamSilver> as a valve
[14:39] <Dan-K2VOL> samsilver how long are you hoping to float?
[14:39] <SamSilver> into the record books :p
[14:40] <Dan-K2VOL> more than 50 hours?
[14:40] <Dan-K2VOL> normal latex balloons will just not make it that long in the sun :-(
[14:41] <SamSilver> yip 40m Cw and a ballast system of venting and sand dropping
[14:41] <SamSilver> or glyco alcohol
[14:41] <Dan-K2VOL> I'd really recommend using a plastic balloon if you're going for more than about 4 hours in the sun
[14:42] <SamSilver> Dan-K2VOL: do you now of any test on UV and latex balloons ?
[14:43] <jcoxon> Dan-K2VOL, i reckon it can do longer
[14:43] <Dan-K2VOL> lol, yes, all the flights that have been latex floaters have burst after about 4 hours in the sun
[14:43] <SamSilver> I intend to test a bit of the neck that I will trim off
[14:43] <Darkside> Dan-K2VOL: oh rly?
[14:43] <Darkside> our balloon was in sun for 9 hours
[14:43] <Dan-K2VOL> and burst didn't it
[14:43] <Darkside> floating for 5 of that, before the sun set
[14:43] <Darkside> it burst when the sun heated it up agan and it rose to a burst point
[14:44] <Darkside> longer than 4 hours though :-)
[14:44] <Darkside> probably more like 11 hours of sun exposure i think
[14:44] <Darkside> but yes, is you want to do a floater, don't use a latex balloon
[14:45] <Newbz> 'want to do a floater' o.0
[14:45] <Dan-K2VOL> that's my point
[14:45] <Newbz> Sorry... :-p
[14:45] <SamSilver> hmmm I wish phisicis was like I think it :p
[14:45] <Darkside> and sell it
[14:45] <Darkside> spell*
[14:45] <Darkside> ugh....
[14:45] <SamSilver> lol
[14:45] <jcoxon> Darkside, haha
[14:45] <Newbz> oh dear oh dear lol
[14:45] <NigeyS> lol
[14:45] <Newbz> that didn't pan out
[14:46] <Newbz> hehe
[14:46] <Darkside> nope
[14:46] <NigeyS> jcoxon, what ya think, launch picochu-2 sunday in 25mph winds, or wait a week? :P
[14:46] <jcoxon> wait
[14:46] <NigeyS> meh no sense of adventure! lol
[14:46] <jcoxon> any balloon damage and funny things will happen
[14:46] <jcoxon> like my last flight
[14:46] <NigeyS> that's true
[14:47] <Newbz> so you trying to make a balloon hover at a set altitude, or within a small altitude range?
[14:47] <jcoxon> everything is so tenious you need to reduce the risks
[14:47] <SamSilver> Newbz: yip
[14:47] <NigeyS> jcoxon, agreed, saturday is better, 9mph but i dont think i can be ready then :/
[14:48] <Newbz> that's interesting :)
[14:48] <Newbz> how do you plan to counter the lift?
[14:48] <SamSilver> and hard
[14:48] <Newbz> yeah i bet
[14:48] <Newbz> vent helium?
[14:48] <SamSilver> vent
[14:48] <SamSilver> he
[14:48] Last message repeated 1 time(s).
[14:48] <jcoxon> NigeyS, then wait
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[14:49] <Darkside> NigeyS: got those PCBs working yet?
[14:49] <NigeyS> would've been good to do it while phil was over for the conference, but we're not going to have time
[14:49] <SamSilver> nosebleedKT: welcome
[14:50] <NigeyS> Darkside, still waiting on the 47k resistors, but the board powers up just fine, can get a good temp reading, so i think theyre good
[14:50] <nosebleedKT> Ok, guys this is the picture of the year in Greece:
[14:50] <nosebleedKT> http://a8.sphotos.ak.fbcdn.net/hphotos-ak-ash4/303962_257148510995398_213217728721810_712758_888941645_n.jpg
[14:50] <Darkside> i hope Randomskk and DanielRichman don'y do too many hacks to the tracker system during the conference
[14:51] <NigeyS> lol oh im sure they will
[14:51] <Darkside> we're going to heavily loading it down on the Sunday..
[14:51] <Darkside> and we need it to be working!
[14:51] <NigeyS> oh, a horus flight ?
[14:51] <Darkside> either 3 or 4 of them
[14:51] <NigeyS> blimey dude
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[14:51] <daveake> Plus I'm hoping for Buzz1 to fly on the Sunday
[14:52] <Darkside> daveake: what time
[14:52] <daveake> Prolly 10am UK time
[14:52] <Darkside> hmm
[14:52] <daveake> My slot is 9-1
[14:53] <Darkside> we should be down by then
[14:53] <Darkside> thats 7:30pm our time
[14:53] <daveake> You said that last time :p
[14:53] <Darkside> yeah yeah
[14:53] <Darkside> these balloons will be overfilled anyway
[14:53] <daveake> ok
[14:53] <SamSilver> daveake: you stole my line
[14:53] <daveake> lol
[14:53] <Darkside> the most important payloads will have cutdowns, assuming i can get them built in time
[14:53] <Darkside> ugh
[14:53] <daveake> Ditto
[14:54] <SamSilver> Darkside: up link cut down ?
[14:54] <daveake> Just a hot wire - building won't take long
[14:54] <Darkside> uplink cut-down, yes
[14:54] <SamSilver> dtmf?
[14:55] <Darkside> yep
[14:55] <SamSilver> mmm would love to see
[14:55] <Darkside> its going to be quite simple
[14:56] <SamSilver> airbourne arlinco?
[14:56] <Darkside> we're going to be using a radiometrix BiM2 module
[14:56] <Darkside> as i have a few of those lying around
[14:56] <Darkside> or basically any other simple radio receiver we can find
[14:56] <Darkside> well, transciever
[14:56] <Darkside> i want to make it send out a few 'bips' to tell me its still operational
[14:57] <Darkside> and send an 'ack' when its received a command
[14:57] <Darkside> so i can occasionally ping it to check its alive
[14:57] <SamSilver> coded uplink?
[14:57] <Darkside> probably
[14:57] <Darkside> it will have to be a DTMF code sequence
[14:58] <SamSilver> CMF8870?
[14:58] <Darkside> ?
[14:58] <SamSilver> DTMF decoder
[14:58] <Darkside> oh, not sure
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[14:58] <Darkside> another guy in the team has a few
[14:58] <SamSilver> I am busy ordering parts
[14:59] <Darkside> we'll probably hack something together with an attiny and a bit of veroboard
[15:00] <SamSilver> I watch with interest
[15:00] <Darkside> so do i >_>
[15:01] <Darkside> we'll probably only have 2 out of 4 launches with cutdowns i think
[15:01] <Darkside> put htem on the most expensive payloads, heh
[15:01] <SamSilver> I am also keen to have a look see at your 40m 5w Tx
[15:01] <Darkside> when i build it
[15:01] <Darkside> >_>
[15:02] <SamSilver> well maybe I will show you mine
[15:02] <SamSilver> when I build it :p
[15:02] <Darkside> all i know is i'll probably be using an AD9834 DDS
[15:02] <Darkside> as the signal generator
[15:03] <SamSilver> WTF is a AD9834 DDS ?
[15:03] <Darkside> direct digital synthesizer
[15:03] <Darkside> as in, a signal generator i can control in software
[15:04] <Darkside> so i can program in 2 freqiencies, and switch between them
[15:04] <Darkside> i.e. 7.038000MHz and 7.038425MHz
[15:04] <SamSilver> smart
[15:04] <Darkside> and i can flick between them at, say, 300 baud
[15:04] <Darkside> >_>
[15:04] <Darkside> i've done this already, in a previous payload
[15:05] <Darkside> i just didn't have a decent amplifier on it
[15:06] <SamSilver> I like a f class
[15:07] <Darkside> F?
[15:07] <Darkside> i've been using Class E's
[15:07] <SamSilver> am only smart enough for a e
[15:07] <SamSilver> an e
[15:07] <SamSilver> yes less inductors
[15:08] <SamSilver> afk for a min
[15:08] <Darkside> kk
[15:08] <Darkside> i think i should get to bed
[15:08] <Darkside> almost 2am here
[15:13] <SamSilver> I got to dash
[15:13] <SamSilver> cheers
[15:13] <SpeedEvil> DDS chips are fun
[15:14] Nick change: SamSilver -> SamSilver_
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[15:39] <UpuWork> Josh is on BBC1 South tonight at 1830
[15:41] <daveake> I'll tune in for that :)
[15:47] <UpuWork> http://www.bbc.co.uk/programmes/b006pfl4
[15:59] <Dan-K2VOL> will it be online later maybe?
[15:59] <UpuWork> hopefully
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[16:26] <daveake> Bits of polystyrene everywhere. Again. :p
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[17:07] <griffonbot> Received email: Kristaps "Re: [UKHAS] UKHAS Conference Streaming"
[17:15] <nosebleedKT> is there a live streaming of the conference?
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[17:24] <fsphil-laptop> nosebleedKT, yea
[17:26] <fsphil-laptop> how did the launch today go? did it go ahead?
[17:28] <daveake> Today? Tomorrow?
[17:28] <daveake> Or did I miss one?
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[17:31] <fsphil-laptop> hmm.. I might have mixed them up
[17:31] <fsphil-laptop> it was the one trying 9600 baud
[17:33] <daveake> I think that's the one tomorrow from Cambs
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[17:34] <daveake> fsphil-laptop You'll be pleased to know ... Buzz now has 2 more LEDs :)
[17:38] <fsphil-laptop> yes!
[17:38] <fsphil-laptop> now it's perfect
[17:38] <daveake> All I/O pins accounted for
[17:39] <daveake> One of them's blue. Even more perfect. Prety dim though as it's all running from3V3
[17:39] <daveake> Blue needs a bit more really
[17:40] <fsphil-laptop> yea
[17:40] <fsphil-laptop> but should still look good
[17:40] <daveake> Yep :)
[17:41] <daveake> The firmware has 2 modes where it flashes them all in sequence, and bleeps the buzzer. One is when it's landing or landed, and the other is on startup in case the thing reboots on landing.
[17:42] <daveake> I have a wire which I short to stop that and start the usual flight mode sequence
[17:42] <fsphil-laptop> good plan
[17:42] <nosebleedKT> fsphil: link ?
[17:43] <fsphil-laptop> there is none yet nosebleedKT
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[17:47] <daveake> Josh on TV now
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[17:53] <daveake> I recorded most of that TV spot, in case anyone needs it
[17:53] <fsphil-laptop> any good?
[17:54] <daveake> Yep.
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[17:56] <fsphil-laptop> grr internet
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[17:56] <daveake> Just uploading to YT in case it's needed
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[18:04] <number10> so you are going for it on sunday daveake
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[18:06] <daveake> A week on Sunday. Should be less windy.
[18:06] <daveake> Trying to avoid littering the English Channel this time
[18:06] <number10> so you dont fancy saturday week then ;)
[18:07] <daveake> Er, no, think I've got something on that day ....
[18:07] <fsphil-laptop> reminds me
[18:07] <fsphil-laptop> I better pack
[18:12] <daveake> JoshTV - http://www.youtube.com/watch?v=evpM-w3eS-U
[18:13] <daveake> Sorry I missed the beginning. I was yelling for Mrs Dave to come and watch, then gave up and hit the record button
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[18:18] <Lunar_Lander> hello
[18:18] <number10> looks like Upu s fittage from burst and landing - hope he gets royalties
[18:18] <daveake> :D
[18:18] <number10> *fottage
[18:18] <daveake> footage
[18:19] <number10> damn - I give up with keyboards
[18:20] <number10> what pressure sensor do you have in buzz1 daveake?
[18:20] <fsphil-laptop> speeling is overated
[18:20] <daveake> SCP1000
[18:20] <number10> i think its an age thing - plus I look at the keyboard rather than the screen
[18:21] <daveake> http://www.sparkfun.com/products/8161
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[18:22] <Dan-K2VOL> daveake, so you have the SCP and not the BMP
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[18:25] <Lunar_Lander> hi Dan-K2VOL
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[18:32] <Dan-K2VOL> hey kev
[18:33] <Lunar_Lander> how are you?
[18:37] <Dan-K2VOL> doin great! u?
[18:38] <Dan-K2VOL> we're going to burst one of our zero pressure balloons
[18:38] <Dan-K2VOL> midair
[18:38] <SpeedEvil> Ground level?
[18:38] <Dan-K2VOL> flight level - to find the true burst differential pressure
[18:38] <SpeedEvil> ah
[18:39] <Dan-K2VOL> going to launch it with the vent sealed off
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[18:39] <SpeedEvil> Youhave some sort of sensor?
[18:39] <Dan-K2VOL> have to know that to make a vent valve
[18:39] <Dan-K2VOL> yeah the MPXV5050 pressure sensor
[18:39] <Dan-K2VOL> or that family of sensors
[18:39] <SpeedEvil> ah
[18:40] <SpeedEvil> Same thing would be interesting with a variety of balloons.
[18:40] <Dan-K2VOL> it would, actually we're going to test the datalogger this saturday evening, might have the flight on spacenear
[18:40] <Dan-K2VOL> on a latex flight
[18:41] <Dan-K2VOL> it will attempt to measure pressure the whole time
[18:41] <Lunar_Lander> I'm good thanks Dan-K2VOL
[18:41] <SpeedEvil> Dan-K2VOL: Should be interesting
[18:41] <SpeedEvil> I guess a sort of bathtub curve, with the right-hand edge being quite small
[18:41] <SpeedEvil> (pressure vs alt)
[18:42] <Dan-K2VOL> heh yeah
[18:42] <Dan-K2VOL> I'm not sure if the order of magnitude will be the same on latex vs ZP
[18:43] <Dan-K2VOL> the ZP should take a lot more pressure to burst, I'm guessing around 1psi
[18:44] <SpeedEvil> Oh - that was for latex
[18:44] <GW8RAK> Dan-K2VOL Do you have a pattern for your zero pressure balloon showing the shape of the panels please?
[18:44] <Dan-K2VOL> we should put together an amateur database on balloon experiment data results
[18:44] <Dan-K2VOL> yes, look on teh bottom of this page: wiki.whitestarballoon.com
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[18:45] <Dan-K2VOL> the black image
[18:45] <Dan-K2VOL> that's what we measured with it laying flat on the ground
[18:45] <Dan-K2VOL> it's very difficult to calculate volume of that silly shape
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[18:47] <GW8RAK> You've gone for a "convenient" shape rather than a traditional balloon shape?
[18:47] <GW8RAK> i.e. 4 flat panels and a flat roof?
[18:48] <SpeedEvil> What webpage is this?
[18:48] <GW8RAK> See Dan's comment at 19:44
[18:49] <Zuph> GW8RAK: It's actually just two big panels sealed together.
[18:50] <GW8RAK> Okay, so not really a 3D shape. I've been looking for balloon designs, but they aren't easy to come across or to work out.
[18:52] <Dan-K2VOL> it's a mess made from mistakes made by the manufacturer is what it is
[18:52] <Dan-K2VOL> we asked for a cylindrical balloon
[18:52] <Dan-K2VOL> with a temp sensor in the middle of the top
[18:52] <SpeedEvil> ah
[18:53] <Dan-K2VOL> and he made it with the temp sensor in the corner, and made it too big. I told him that we wouldn't take delivery if the balloon wasn't going to float at 10km
[18:53] <Dan-K2VOL> so he cut off the top left corner and trimmed in the bottom
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[18:53] <SpeedEvil> Wierd shapes.
[18:53] <Dan-K2VOL> and says that now it should be 10km
[18:53] <Upu> grumble mumble silly firewall corrupting flash
[18:54] <Upu> hi anyone see me on TV ? :)
[18:54] <Dan-K2VOL> I might after work!
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[18:54] <Upu> I was on the launch footage letting go of the balloon :)
[18:55] <Dan-K2VOL> nice!
[18:55] <GW8RAK> That sounds all very haphazard Dan. Was a "professional" balloon maker?
[18:55] <Dan-K2VOL> I agree, we were very very displeased
[18:55] <Dan-K2VOL> it was the only person who would build a balloon for amateurs, Mark Caveizel of Global Western
[18:56] <GW8RAK> I was thinking of a cylinder, but the weight of the envelope is much greater than a spherical one of the same He capacity
[18:56] <Dan-K2VOL> we paid $300USD each for 5 of them
[18:56] <GW8RAK> Serious money. What are they made in?
[18:56] <GW8RAK> made of?
[18:56] <Dan-K2VOL> well, you're not going to be able to make a spherical balloon, it's just too complex to seam. you could however come close with a tetrahedron
[18:56] <Dan-K2VOL> Polyethylene
[18:56] <Dan-K2VOL> 2mil I think
[18:57] <number10> is it online yet Upu, daveake uploaded to youtube but he missed you out
[18:57] <SpeedEvil> You can do it mostly with two wierd shapes
[18:57] <Upu> whats URL ?
[18:57] <SpeedEvil> But that loses quite a lot of spare
[18:57] <GW8RAK> I was wondering about space blanket fabric stuck together with some very thin double sided tape here at work
[18:57] <SpeedEvil> O=O sort-of
[18:57] <SpeedEvil> Two, crossed.
[18:57] <Lunar_Lander> hi Zuph GW8RAK Upu
[18:57] <GW8RAK> space blanket = mylar film
[18:58] <GW8RAK> Evening Lunar_Lander
[18:58] <Lunar_Lander> hi Paradoxial
[18:58] <number10> Upu: http://www.youtube.com/watch?v=evpM-w3eS-U you need royalties for the vids
[18:58] <Paradoxial> Hi Lunar
[18:58] <Upu> yeah the vids were mine :)
[18:58] <Upu> bar the launch one
[18:58] <Upu> but I said he could use them
[18:59] <Dan-K2VOL> take a look at this paper for tetroon shaped balloons: http://docs.lib.noaa.gov/rescue/mwr/088/mwr-088-07-0235.pdf
[18:59] <Zuph> hi Lunar_Lander
[18:59] <number10> it actually makes a good story whith tyour vid of it bobbing in the sea
[18:59] <Lunar_Lander> YAY Josh is the star!
[18:59] <Lunar_Lander> xD
[19:00] <Upu> love the dramatic black screen
[19:00] <Upu> GPS communication was lost....queue 2 second black screen and silence
[19:00] <Lunar_Lander> oh
[19:01] <GW8RAK> Shouldn't be hard to make to that shape
[19:02] <number10> should be on I player tomorrow
[19:02] <Upu> cheers daveake
[19:02] <Upu> good quality
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[19:03] <daveake> No problem :)
[19:03] <daveake> My laptop has a USB TV receiver
[19:03] <Upu> ah did wonder
[19:03] <Upu> I recorded it
[19:03] <Upu> but how you get something off a Sky+ box is beyond me
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[19:04] <daveake> For Sky+ I used to play from Sky into a DVD recorder, then rip that on a PC
[19:04] <UpuWork> ah ok
[19:04] <daveake> Now we have a Humax sat receiver and the files can be copied directly to a USB stick
[19:04] <UpuWork> choccydonuts :)
[19:05] <daveake> :D
[19:05] <fsphil-laptop> unless you record it from bbc hd
[19:05] <Lunar_Lander> XD
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[19:05] <daveake> Yeah, HD is knoblled
[19:05] <Lunar_Lander> btw
[19:05] <Lunar_Lander> I would like a DVD of the UKHAS conference
[19:05] <Lunar_Lander> :P
[19:05] <UpuWork> its going on Youface Mybook
[19:05] <Dan-K2VOL> haha
[19:06] <UpuWork> anyway brb just need to reflash my firewall
[19:06] <number10> can you not record the lunch ;)
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[19:10] <daveake> fsphil-laptop - have you borrowed smea's internet?
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[19:12] <daveake> yes
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[19:13] <fsphil-laptop> daveake, hloj
[19:13] <fsphil-laptop> er
[19:13] <fsphil-laptop> you'd think it
[19:13] <fsphil-laptop> I'm in the office, and there are geeks in the server room playing with the patch panel
[19:13] <Lunar_Lander> xD
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[19:18] <Upu> Dan-K2VOL
[19:18] <Upu> are you Dan Bowen ?
[19:18] <Dan-K2VOL> yes
[19:19] <Dan-K2VOL> you have revealed my true identity!
[19:19] <Upu> dang :)
[19:19] <Dan-K2VOL> I will no longer be able to fight crome
[19:19] <Dan-K2VOL> crime
[19:19] <Upu> got your mail
[19:19] <Dan-K2VOL> or spell
[19:19] <Dan-K2VOL> cool
[19:19] <Upu> thx will read it and come back to you in a bit sorry just snowed under atm
[19:19] <Dan-K2VOL> no problem at all
[19:19] <Upu> might need to have a chat with you me and jcoxon when he's back
[19:19] <Dan-K2VOL> sounds like a good plan
[19:20] <Lunar_Lander> dan is the knight rider!
[19:20] <Dan-K2VOL> hmm, but I don't have poofy hair
[19:20] <Lunar_Lander> xD Mike from KR 2008 didn't had that either
[19:21] <Dan-K2VOL> oh lol I missed that one
[19:22] <Lunar_Lander> :)
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[19:27] <Upu> daveake use Hydrogen and I think buzz will make it. Either that or explode in a specacular fireball
[19:27] <daveake> And either is a win? ;)
[19:28] <Upu> extra bonus points for explosion > 40k
[19:28] <Lunar_Lander> XD
[19:28] <daveake> lol
[19:28] <Dan-K2VOL> any of you guys listen to the naked scientists?
[19:31] <Dan-K2VOL> I guess you all like your nerds to have clothes on...
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[19:38] <Lunar_Lander> xD
[20:02] <GW8RAK> Time for home I think. Too long at work today.
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[20:04] <griffonbot> Received email: Rob "[UKHAS] Re: UKHAS Conference Streaming"
[20:05] <Lunar_Lander> yea
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[20:21] <griffonbot> Received email: David Thompson "Re: [UKHAS] UKHAS Conference Streaming"
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[20:39] <Hiena> Well, the MAAMSS0017 is pretty fun op.amp.
[20:39] <EI5GTB> any launches on for the wkend?
[20:39] <jonsowman> CUSF one was planned but called off due to weather
[20:40] <jonsowman> we've got several in the next few weeks though
[20:40] <EI5GTB> nice one, would love to tag along on one of the launches some wkend
[20:40] <jonsowman> where are you based?
[20:41] <number10> are the planned CUSF flights posted anywhere
[20:41] <jonsowman> number10: they will be once our shiny new website is up and running
[20:41] <jonsowman> which shouldn't be too long :)
[20:41] <number10> cool
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[20:42] <EI5GTB> was based on donegal, ireland, but now in wandsworth, London
[20:42] <jonsowman> EI5GTB: cool, well if you want to come up to cambridge to watch a launch you're very welcome
[20:42] <EI5GTB> that would be sweet
[20:44] <Upu> going to one before you launch yourself really helps
[20:44] <EI5GTB> i would say, yea
[20:44] <EI5GTB> i have allot of un-answered questions!
[20:44] <Upu> lots of little tips you learn that don't seem to be anywhere else
[20:44] <jonsowman> EI5GTB: it's all a bit up in the air at the moment due to weather, but get in contact mid-week next week
[20:44] <EI5GTB> my main interest is in the RF side of things, so my problem is i dont think of all the other problems
[20:44] <jonsowman> i'm always on here :)
[20:45] <Upu> yeah the only issue is you rarely have a definite "go" until 24 hours before
[20:45] <EI5GTB> sound, i'll be workin all week so would only would be aqble to get up if its at the wkend
[20:45] <jonsowman> EI5GTB: they probably will be, but get in contact next week and i'll let you know what's going on
[20:46] <EI5GTB> good stuff! i must nip to bed now, but i'll chat in the no so distant future
[20:46] <jonsowman> no problem, chat soon
[20:49] <fsphil> yay, home with decent internet
[20:49] <jonsowman> hi fsphil, how's things?
[20:49] <fsphil> hiya jonsowman, not too bad. long day. you?
[20:50] <jonsowman> yep not too bad thanks
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[20:51] <Lunar_Lander> back
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[20:51] <jonsowman> hi fergusnoble
[20:52] <fergusnoble> hi jon
[20:52] <fergusnoble> hows it going?
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[20:52] <jonsowman> yeah good thanks, term started again
[20:52] <fergusnoble> oh cool
[20:52] <jonsowman> how are you? what are you up to at the moment?
[20:53] <Lunar_Lander> hello jonsowman
[20:53] <jonsowman> hi Lunar_Lander
[20:53] <Lunar_Lander> how are you?
[20:53] <jonsowman> fine thank you, yourself?
[20:53] <Lunar_Lander> thanks, I am fine too
[20:53] <fergusnoble> not bad, been doing some VHDL the last few days, good mix of frustration and fun
[20:54] <jonsowman> sounds good
[20:54] <jonsowman> what are you working on?
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[20:56] <Hiena> The MAAMS drive pretty well the 500mW 4 transistor push-pull power stage. Even an oscillator enough for the full output power.
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[21:00] <Hiena> The only problem is the power consumption. the maams pull 74mA @5V the power stage pulls 120mA@13V.
[21:01] <Upu> https://picasaweb.google.com/118244444241111963790/201110AvaLaunch#5660858127407002786 another stich
[21:02] <Hiena> On the pro side, it will heat the payload well.
[21:05] <RocketBoy> Anyone know where the GFS model (as used by the CUSF predictor) stops in terms of altitude? I guess anything above this the predictor just assumes that the wind direction is the same?
[21:06] <jonsowman> someone asked that the other day and i can't remember
[21:06] <Dan-K2VOL> something like 50,000 or 60,000? i don't know for sure
[21:06] <jonsowman> i had 50k in mind
[21:06] <jonsowman> it's at least that, i'm certain
[21:07] <SpeedEvil> IIRC it's 30km
[21:07] <jonsowman> hmm could be
[21:07] <jonsowman> i knew once.
[21:07] <Dan-K2VOL> it's not high enough, I know that
[21:08] <RocketBoy> I notice that some of the graphical displays only go down to 250mB
[21:08] <RocketBoy> like wetaherunderground
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[21:08] <number10> thats a nice panorama Upu
[21:08] <RocketBoy> which usese GFS too
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[21:09] <RocketBoy> who would know for sure?
[21:10] <fergusnoble> yeah the NOAA data is vertically gridded by pressure not altitude
[21:10] <RocketBoy> yeah
[21:10] <fergusnoble> just checking what pressure it goes down to
[21:11] <RocketBoy> cheers
[21:11] <fergusnoble> jonsowman: still working on the software GPS
[21:11] <number10> I think it was me who asked a question about the wind info used - but cant remember the answer - sorry
[21:12] <jonsowman> fergusnoble: cool
[21:12] <jonsowman> going well?
[21:13] <fergusnoble> http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_hd.pl?dir=%2Fgfs.2011091506%2Fmaster
[21:13] <fergusnoble> looks like it goes down to 10mb
[21:13] <RocketBoy> cheers
[21:14] <RocketBoy> SpeedEvil: recalled about correct then
[21:14] <Lunar_Lander> btw
[21:14] <Lunar_Lander> did I tell you that I found a good song for UKHAS?
[21:15] <Lunar_Lander> I mean some kind of theme song
[21:15] <natrium42> FUnkytown?
[21:15] <RocketBoy> fergusnoble so anything above that is just assumed to we the same direction as 10mb?
[21:16] <Lunar_Lander> xD natrium42
[21:16] <Lunar_Lander> it is this one: http://www.youtube.com/watch?v=Gh71ma8Zot0
[21:16] <fergusnoble> RocketBoy: I would have to look over the code again
[21:21] <RocketBoy> sorry
[21:24] <Lunar_Lander> natrium42 : how is the song?
[21:24] <fergusnoble> you might find it here: https://github.com/jonsowman/cusf-standalone-predictor/blob/master/pred_src/wind/wind_file.c
[21:25] <fergusnoble> I had a look but couldn't see anything, its changed a bit since I worked on it.
[21:26] <fergusnoble> jonsowman: yeah its going pretty well, starting to make good progress now. How is it going at camb/cusf?
[21:26] <jonsowman> good to hear!
[21:26] <natrium42> Lunar_Lander: to loud here to listen
[21:26] <jonsowman> yeah going quite well, I'm unsure where we got to with procuring another LISA and IMU
[21:27] <jonsowman> Randomskk and I have one of the new generation radios working in prototype form
[21:27] <RocketBoy> fergusnoble: thanks I'll take a look
[21:27] <jonsowman> frequency and power programmable, and _tiny_
[21:27] <Lunar_Lander> oh ok natrium42
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[21:51] <akawaka> whats the best way to calculate ascent rate?
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[21:58] <Lunar_Lander> well
[21:59] <Lunar_Lander> there is a problem if you want to do it with eqalized forces because this gives you an increasing rate with altitude
[21:59] <Lunar_Lander> but we always see constant rates
[21:59] <SpeedEvil> Not really
[21:59] <RocketBoy> akawaka: either use the embeded calculator in the CUSF predictor of the spreadsheet on the UKHAS wiki
[22:00] <SpeedEvil> If you assume the balloon is zero pressure, and the balloon is spherical - then the diameter rises according to the third root of pressure.
[22:00] <SpeedEvil> Once you do the conversions to work out drag, you find out that drag is a constant for a given speed
[22:01] <SpeedEvil> for a given speed and volume of gas, rather
[22:01] <SpeedEvil> I.E. at 1% atmosphere, it's 10* the diameter, with 100* the area, but as the drag is area * density * v^2, the area*density product is constnat
[22:05] <akawaka> got it
[22:05] <akawaka> johan and i are finally doing another launch tomorrow
[22:05] <Upu> where from ?
[22:08] <akawaka> southern california
[22:08] <Upu> Bit far out for me to listen in :) Are you using spacenear.us ?
[22:11] <akawaka> no, not familiar with that
[22:11] <Upu> ok
[22:11] <Upu> its the website we use to track the balloons
[22:11] <Upu> good luck with it anyway
[22:11] <akawaka> balloon has a 40m morse beacon on it, so you might be able to hear it anywhere:)
[22:12] <Upu> damn your american laws :)
[22:12] <Upu> what antenna is on that ?
[22:12] <Upu> dumb question, a big one
[22:15] <akawaka> haha
[22:19] <akawaka> basically just a 1/4 wave monopole
[22:20] <nosebleedKT> gnite all!
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[00:00] --- Sat Oct 8 2011