highaltitude.log.20140202

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[00:04] <LeoBodnar> Quite a significant doppler range Laurenceb http://bib.irb.hr/datoteka/39128.p0767.PDF Fig.4
[00:05] <LeoBodnar> What sats are they using?
[00:07] <LeoBodnar> 2h period
[00:15] <LeoBodnar> I might try sampling MAG as well
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[00:29] <Laurenceb_> im not sure if that is a real sat...
[00:29] <Laurenceb_> i guess you could use ARGOS
[00:30] <Laurenceb_> but i dont know how often it funs downlink
[00:30] <Laurenceb_> *runs
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[05:47] <gamer> Hey guys... I am doing a theoretical project, and I want to know how parachute size varies with payload and decent rate ..for a HAB
[05:48] <gamer> I mean.. general trends..
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[05:59] <Darkside> gamer: theres a chart on the ukhas wiki somewher
[06:00] <Darkside> http://ukhas.org.uk/guides:parachute_sizing_chart
[06:00] <gamer> Are you talking about this?? http://ukhas.org.uk/guides:parachute_sizing_chart?s[]=parachute&s[]=size
[06:00] <Darkside> its a bit difficult to read
[06:00] <gamer> yea the same one
[06:00] <gamer> I was lost reading this..lol
[06:00] <Darkside> yeah im not sure how to read it either :P
[06:01] <gamer> :D hahaha
[06:02] <gamer> do you know what the PARACHUTE DRAG FORMULA is?
[06:02] <Darkside> nope, haha
[06:02] <Darkside> theres a few people here that will know
[06:02] <Darkside> but they will all be asleep
[06:02] <Darkside> they should start waking up in a few hours
[06:03] <gamer> lol.. alright.. I will ask the same question again after a couple of hours then
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[06:54] <gamer> Hey guys.. I want to know how balloon size varies with payload, in general.. I am doing a theoretical project...
[06:58] <Darkside> you can get an idea by using the burst calculator
[06:58] <Darkside> basically play with teh figures and try and keep a constant burst altitude
[06:58] <Darkside> or a constant ascent rat
[06:59] <Darkside> rate*
[07:16] <gamer> Where is the burst calculator?
[07:17] <Darkside> http://habhub.org/calc/
[07:18] <gamer> Thanks
[07:19] <gamer> This has the balloon mass.. I want the balloon size..
[07:19] <Darkside> well it tells you the volume of gas rquired
[07:19] <Darkside> and from that you can probably figure out the size
[07:19] <Darkside> the balloon mass is an important thing to tak into account
[07:20] <gamer> Alright
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[08:05] <g0ier> hello all
[08:05] <Upu_M0UPU> morning
[08:05] <jcoxon> morning
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[08:05] <DL1SGP1> morning, time for breakfast :D be back in a bit
[08:06] <m1eak> hi all
[08:08] <g0ier> A picture of the VK4HIA flight just before burst .. http://tech-exp.webs.com/apps/blog/show/41225171-balloonatics
[08:09] <jcoxon> thats a great pic
[08:09] <Upu> nice
[08:10] <Upu> nothing heard from sp9uob then ?
[08:10] <jcoxon> doesn't look like it
[08:11] <Upu> shame
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[08:37] <SP9UOB-Tom> morning !
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[08:45] <jcoxon> SP9UOB-Tom, any news?
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[09:02] <SP9UOB-Tom> jcoxon: nope :-(
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[09:03] <SP9UOB-Tom> no trackers in Lithuana, too far from Lativia
[09:04] <SP9UOB-Tom> im suspecting freezing rain, that bring it down
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[10:26] <Neil_M0CJM> Morning all
[10:26] <fsphil> morn!
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[10:41] <LeoBodnar> good morning
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[10:55] <SP9UOB-Tom> morning Leo
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[11:07] <delphinus> What frequency is Icarus using?
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[11:15] <jcoxon> delphinus, its someone testing
[11:15] <jcoxon> its from a recorded wav file
[11:17] <delphinus> ok, thanks.
[11:18] <jcoxon> no flights today i think
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[11:46] <anerDev> goo morning guys =D
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[11:49] <fsphil> and a quite morning
[11:49] <Natio> 'morning
[11:49] <fsphil> lovely weather on the ground, the sky is this funny non-grey colour
[11:50] <anerDev> guys, i would like to trasmitt a video from the balloon to the ground
[11:51] <anerDev> what camera and wireless device you use ?
[11:51] <craag> anerDev: Are you allowed amateur radio airborne? If so you can use ATV.
[11:52] <craag> If not.. ssdv is the closest you can get.
[11:53] <fsphil> some countries have quite generous wifi power limits too, that might make a 2.4ghz link possible
[11:53] <Darkside> not without a BIG dish on the ground
[11:53] <fsphil> even with 500mw?
[11:53] <Darkside> the US guys that did it had a dish a few metres in diameter
[11:53] <Darkside> yeah
[11:53] <fsphil> ah
[11:53] <Darkside> we did the calcs for 1W on 23cm
[11:54] <Darkside> and we needed about 25dBi gain on the ground + a LNA
[11:54] <Darkside> and that would only get us a 50km path
[11:54] <Darkside> this was 20MHz wide FM video though
[11:54] <Darkside> the link buget is considerably better using 70cm AM video
[11:54] <Darkside> but not many countries have the spectrum available for that
[11:55] <Darkside> i think 5W of AM video on 70cm into a Quadrafiliar helix would do well
[11:56] <Darkside> the power requirements for that are pretty horrendous though
[11:56] <Darkside> you're talking a 1-2kg payload weight
[11:57] <fsphil> a narrow band digital mode is needed
[11:57] <fsphil> 1 or 2mhz, something like that
[11:57] <Darkside> the closest you'll gt to that is DVB-S
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[11:57] <SP9UOB-Tom> like 1Mbit BPSK
[11:57] <SP9UOB-Tom> :-)
[11:58] <Darkside> whats DVB-S?
[11:58] <Darkside> isnt that QPSK?
[11:58] <SP9UOB-Tom> BPSK should be easier in implementation
[11:59] <fsphil> I think it's qpsk yea
[11:59] <craag> QPSK is easy enough, and means you can use OTS receivers.
[11:59] <Darkside> but you'd really want to fly somethign that can be received with existing hardware
[11:59] <Darkside> yeah
[11:59] <Darkside> you can get DVB-S modulator chips
[11:59] <fsphil> http://www.satbroadcasts.com/DVB-S_Bitrate_and_Bandwidth_Calculator.html
[11:59] <fsphil> nice
[12:00] <Darkside> im not sure of the amps linearity requirements
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[12:01] <Darkside> but i doubt it'll b any harder than analog ATV
[12:01] <Darkside> not with QPSK anyway
[12:01] <Darkside> DVB-T would be a different story
[12:01] <Darkside> but flying a DVB-T payload would be ludicrous anyway
[12:01] <craag> Yes dvb-t is v difficult
[12:02] <Darkside> you need Class A amplifiers for that
[12:02] <Darkside> we got a bunch of 100W continuous duty cycle Class AB amps out of a TV translator
[12:02] <Darkside> we can only run them that 10W if we want to put DVB-T Through them
[12:02] <craag> I've talked to atv guys about dvb-s, and they're up for doing it if we get the airborne
[12:03] <fsphil> 682kbps for a 1mhz dvb-s channel + 1/2 fec
[12:03] <Darkside> what band woudl you do it on?
[12:03] <craag> brb
[12:03] <Darkside> fsphil: you'd need to use a standard bitrate
[12:03] <Darkside> dunno what those are
[12:03] <fsphil> ah yea the symbol rates are limited
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[12:06] <Darkside> frick i have way too many LaTeX documents open
[12:07] <Darkside> (3)
[12:07] <Darkside> one is enough..
[12:07] <Darkside> also its about time i split my thesis into separate files for each chapter
[12:07] <Darkside> its gtting a bit ridiculous at the moment
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[12:18] <SP9UOB-Tom> Darkside: http://www.lechner-cctv.de/d-atv-dvb.151.en.html?mwdSID=p4c91v4e5svbjtepd63dquujs3
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[12:20] <SpeedEvil> Darkside: I note that NXP seems to be amenable to sampling the UHF high power parts - at least they seemed to be willing to do so to me
[12:21] Action: chrisstubbs wants to hurt the creator of rp-sma
[12:21] <Darkside> cool
[12:22] <Darkside> chrisstubbs: hurt the creator of RP-TNC first please
[12:22] <SP9UOB-Tom> and PS/2 plug which is melting at 80 deg C
[12:23] <Upu> I'll vote for the creator of the energy saving light bulb
[12:23] <SP9UOB-Tom> chinese & chinese ;-)
[12:23] <Upu> who didn't look at the primary reason for existance of a light bulb first
[12:23] <Darkside> Upu: eh?
[12:23] <Upu> light bulbs are mean to "light stuff up"
[12:23] <Darkside> what, annoyd with low brightness
[12:23] <Darkside> hah
[12:23] <chrisstubbs> at least the creator of the energy saving light bulb had good intentions
[12:24] <Upu> its like making a better window and coming out with something opaque
[12:25] <SP9UOB-Tom> Upu: in Germany they are selling "heating spheres" which have 80% heating efficiency (well, they also have 20% of waste light - but nothing is perfect...)
[12:25] <Upu> lol
[12:25] <Upu> I've replaced the spots in my kitchen with some LED ones
[12:25] <Upu> which are close but still a little dark
[12:26] <SP9UOB-Tom> use CREE leds :-)
[12:26] <Upu> yeah they are
[12:26] <Upu> 3W per bulb vs 30W for the Halogen spots
[12:27] <Upu> and I've got a "300W" equivalent outside LED flood to fit
[12:27] <Upu> which takes 30W
[12:27] <Upu> http://www.beamled.com/50w-biard-led-floodlight-with-pir-motion-security-sensor.html
[12:27] <Upu> that
[12:28] <SP9UOB-Tom> few months ago i have bought this: http://www.aliexpress.com/snapshot/295444497.html
[12:28] <SP9UOB-Tom> CREE XM-L2 - shocking :-)
[12:28] <Upu> oh yeah
[12:28] <Upu> check out the Trustfire TR-J18
[12:29] <Upu> http://www.aliexpress.com/item/1PC-Trustfire-TR-J18-Flashlight-5-Mode-8000-Lumens-7-X-CREE-XM-L-T6-LED/570221421.html
[12:29] <Upu> Dave and I have one
[12:29] <Upu> its not a torch it makes portals in space time
[12:29] <SP9UOB-Tom> UPU: LOL
[12:30] <Upu> rather effective at locating payloads with hivis tape on
[12:30] <Upu> at night
[12:30] <fsphil> Photon Cannon
[12:30] <Upu> right afk a few
[12:30] <fsphil> I've got one of those LED flood lights, not put it up yet
[12:30] <fsphil> waiting on a day day
[12:30] <fsphil> dry day*
[12:31] <SP9UOB-Tom> Upu: You must take care in dry forrest to not burn it ;-)
[12:32] <SpeedEvil> The new XQ-D series of LEDs are silly.
[12:32] <SpeedEvil> A 1.6mm cube, which does 3W
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[12:33] <SpeedEvil> The recent announcement of them actually getting 200lm/W in an actual fixture is impressive too.
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[13:21] <ibanezmatt13> Think I fixed the camera issue. LeoBodnar you were right, it must have been an internal temperature sensor shutting it off for protection. I've been running it on my window ledge with a nice stream of cold air flowing onto the part of the cam where the batteries are. It's not warm at all, and it's recorded HD footage non stop for 3 hours no problem! :)
[13:21] <ibanezmatt13> So the solution for the payload box I guess it to design an air duct which won't freeze the camera but will offer some sort of cold air flow around the part of the cam where the batteries are. Flight time will only be 2 hours
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[13:23] <SpeedEvil> ibanezmatt13: :)
[13:23] <craag> If it's producing that much heat, I don't think it freezing will be an issue.
[13:23] <ibanezmatt13> probably not craag, hopefully not even
[13:23] <craag> Especially with less convection at altitude.
[13:23] <SpeedEvil> Convection does indeed go way down. Radiation and conduction remain constant.
[13:24] <SpeedEvil> But as pressure drops too - and volumetric heat capacity - the capacity of an outside airstream to cool drops way off too
[13:24] <ibanezmatt13> Yes exactly. The only worry is the part where its like -40C out side for a bit on the way up, before the convection drops so much
[13:24] <craag> Yeah I'd be worried about it overheating tbh!
[13:25] <ibanezmatt13> Yeah me too actually
[13:25] <Babs> ibanezmatt13 - is it a gopro?
[13:25] <ibanezmatt13> Noope, I'm doing an experiment with a £30 Canon :)
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[13:25] Nick change: Geoff-G8DHE_ -> Geoff-G8DHE-M
[13:25] <craag> But the only to find out is to try! (you could always stick a ds18b20 on the hot bit to see what happens)
[13:25] <SpeedEvil> ibanezmatt13: -20C@STP (freezer) with a tiny fan - is probably a reasonable check
[13:25] <SpeedEvil> ibanezmatt13: Pictures may be less interesting though.
[13:25] <Babs> ahh ok. i wrapped a gopro up in a snug polystyrene box on my first one and it overheated within minutes
[13:25] <SpeedEvil> SP, rather, not T
[13:26] <ibanezmatt13> right. Might be worth a try
[13:26] <ibanezmatt13> Babs, that's not good :P
[13:26] <Babs> it got really really hot
[13:26] <Babs> then i tried some holes in the polystyrene, still overheated
[13:26] <Babs> ended up putting it outside in the air, worked fine
[13:26] <ibanezmatt13> Yeah, the test I'm running currently isn't even in its box. Yesterday it cut out in the box after less than 1 hour
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[13:27] <ibanezmatt13> So I'm going to have basically a gaping hole in the side of the box near the camera. Thankfully, the box design means the electronics are in a completely sealed separate unit
[13:27] <Babs> although keeping it warm ish is important, if it is only the shutter that is moving and you are taking photos frequently, it would be unlikely to freeze i think
[13:28] <ibanezmatt13> Yeah. I'm not gonna do this, but if I were to just tape it onto the side so it was 100% exposed, what are the chances of it freezing?
[13:28] <craag> Babs: Was that with the gopro protective case on too?
[13:30] <Babs> Yes, both times
[13:31] <Babs> http://www.flickr.com/photos/91049302@N00/7329592682/in/set-72157629918448066
[13:31] <craag> Yeah mine gets hot enough just in the case!
[13:31] <craag> Snazzy looking!
[13:31] <ibanezmatt13> Shoving the camera completely outside of the box is becoming more and more appealing :P
[13:32] <Babs> and http://www.flickr.com/photos/91049302@N00/8690695116/in/set-72157632733154985
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[13:32] <Babs> I always connected an external battery to it though and kept that bit warm
[13:32] <daveake> I've never had a Canon compact stop early during flight for any reason other than running out of SD card space because I forgot to switch off raw mode :p
[13:32] <Babs> the battery doesn't last long when it is cold
[13:33] <ibanezmatt13> cool, The grandparents have arrived and I'm being summoned, catch you later :)
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[14:10] <es5nhc> Ugh... I see I missed an opportunity to hear something. I was in ES1 from Friday, just got back
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[14:43] <ibanezmatt13> Does anybody know about setting up triggering on a Tek TDS210?
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[14:44] <ibanezmatt13> I can set the trigger voltage and what not, but after its triggered, I need it to stay on the screen so I can analyse it. It goes off pretty much straight after I remove the probe
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[14:45] <SP9UOB-Tom> ibanezmatt13: in my HANTEK there is a function "single seq"
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[14:45] <SP9UOB-Tom> once triggered - it stores sampled data till memory ends
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[14:45] <ibanezmatt13> I don't think there's an option under that name on here... I've done it before but can't remember how
[14:46] <SP9UOB-Tom> and let analyze it
[14:46] <ibanezmatt13> I'm wondering how I can store literally 10ms of data, and then be able to analyse it after I've removed the probes from the circuit I'm analysing.
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[15:10] <LeoBodnar> ibanezmatt13: set Trigger Mode = Single
[15:10] <ibanezmatt13> I'll have a look
[15:10] <LeoBodnar> If the trigger is set to single or one shot mode, the system will stop and wait for the user to arm the trigger again before it will take more data.
[15:11] <ibanezmatt13> ok, set single. I'll test it out
[15:11] <ibanezmatt13> perfect LeoBodnar ! :)
[15:14] <LeoBodnar> I have messed up my GPS code. I see satellites over Australia
[15:15] <LeoBodnar> time to ship v1.0
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[15:28] <SP9UOB-Tom> LeoBodnar: it's not a bug. Its a feature :-)
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[15:31] <LeoBodnar> heh
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[15:51] <DL7AD> LeoBodnar: are you planning to launch any balloons soon? no, right?
[15:51] <LeoBodnar> not at the moment
[15:52] <DL7AD> i have still problems to connect mine with my programmer :/
[15:55] <LeoBodnar> no idea about Atmels - I have only used them a few times
[15:55] <LeoBodnar> I remember they needed oscillator running for programming which I found bizarre
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[16:03] <DL7AD> LeoBodnar: ehm no idea... which one do you use? NXP?
[16:04] <LeoBodnar> for now? I use PIC24
[16:05] <DL7AD> ah
[16:09] <DL7AD> LeoBodnar: which chip do you use to measure temperature?
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[16:12] <LeoBodnar> it's internal Si4460 sensor
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[16:14] <DL7AD> LeoBodnar: rofl.... okay :P
[16:15] <DL7AD> bye.... driving home....
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[16:22] Nick change: aadamson_ -> aadamson
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[16:48] <es5nhc> So SP9UOB didn't make it further than Lithuania???
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[16:55] <Lunar_Lander> hello
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[17:39] <gb73d> http://www.windytan.com/2014/02/mystery-signal-from-helicopter.html
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[18:00] <adwiens_KC0WYS_> gb73d: that's really neat
[18:03] <gb73d> im followinfg that site
[18:03] <gb73d> on twutter
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[18:55] <Laurenceb_> hi all
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[19:00] <LeoBodnar> hi
[19:00] <Laurenceb_> i think im going to make something for once
[19:00] <Laurenceb_> and start work on a rockoon
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[19:01] <LeoBodnar> cool. Is today a decision Sunday?
[19:01] <LeoBodnar> Or is it not? I am not sure!
[19:01] <daveake> not sure
[19:01] <Laurenceb_> heh
[19:02] <Laurenceb_> i need a cheap place for SLS nylon though
[19:02] <Laurenceb_> the prices look horrific so far
[19:03] <LeoBodnar> maybe for a reason
[19:04] <Laurenceb_> http://www.digits2widgets.com/3dnylonprice.html
[19:05] <Laurenceb_> almost the entire cost would be on SLS nylon
[19:07] <Laurenceb_> wait wtf
[19:07] <Laurenceb_> http://www.3dprint-uk.co.uk/portfolio/pricing/
[19:07] <Laurenceb_> theres a 2 orders of magnitude price difference
[19:09] <Laurenceb_> unless the first one mixed up pounds and pence...
[19:10] <Laurenceb_> lol yeah thats what happened
[19:11] <Laurenceb_> ~£35 for the whole project isnt bad going XD
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[19:22] <DL7AD> good evening :)
[19:28] <adwiens_KC0WYS_> evening DL7AD
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[19:37] <DL7AD> evening adwiens_KC0WYS_
[19:42] <LeoBodnar> Laurenceb: I have sampled MAG but have seen not seen much difference
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[19:45] <ibanezmatt13> We've drilled some holes in the side of the box where the battery part of the camera is in the hope it'll dissipate enough heat without affecting the structure of the box. Currently testing it outside in the rather cold air
[19:46] <Laurenceb_> LeoBodnar: interesting
[19:46] <Laurenceb_> aiui it helps if there is strong CW blocking
[19:46] <Laurenceb_> and you dont seem to have any such issues
[19:47] <LeoBodnar> I am not sure AGC is working well on 4110
[19:47] <Laurenceb_> me neither
[19:47] <LeoBodnar> in such case MAG is pretty pointless
[19:48] <Laurenceb_> http://uk.farnell.com/comus-assemtech/asls15/switch-acceleration-15g/dp/4229071
[19:48] <Laurenceb_> handy device
[19:49] <LeoBodnar> "Manufactured in UK" wow
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[20:01] <BitEvil> Laurenceb_: Also - in principle for UK vendors in particular - they might be willing to partially sponsor
[20:02] Nick change: BitEvil -> SpeedEvil
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[20:07] <Laurenceb_> SpeedEvil: id rather keep it low key
[20:07] <Laurenceb_> if i were to do something
[20:07] <SpeedEvil> Fair point
[20:07] <SpeedEvil> Is this the RCS thruster test?
[20:08] <Laurenceb_> yes
[20:08] <Laurenceb_> ill start simple, and build an RCS thruster rig
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[20:13] <SpeedEvil> Is this just a SLS thingy to hold a CO2 bottle, a valve, and a nozzle?
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[20:13] <SpeedEvil> 'bottle'
[20:14] <Laurenceb_> nope, simpler
[20:14] <Laurenceb_> a 1.25L pop bottle with "dumb" spin nozzle
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[20:18] <SpeedEvil> ah
[20:18] <SpeedEvil> You mean to launc, or to throw up in the air at ground level?
[20:19] <SpeedEvil> Actually, I guess just suspension would be interenesting
[20:27] <BrainDamage> not a soda can bottle with a lathed nozzle that regularry fails ignition tests? :J
[20:32] <SpeedEvil> :)
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[20:36] <LeoBodnar> how do you control mentos delivery?
[20:37] <Laurenceb_> hehe BrainDamage
[20:39] <Laurenceb_> http://www.threadspecs.com/threadspecs-downloads.asp
[20:39] <Laurenceb_> useful
[20:41] <Laurenceb_> http://www.threadspecs.com/assets/Threadspecs/pco1810.pdf
[20:41] <Laurenceb_> thats a standard pop bottle
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[21:25] <ibanezmatt13> Ok. We drilled a few small holes on one part of the box where the batteries inside the camera were in the hope it would dissipate the heat... it didn't. Camera overheated and shut down after 1h 50m, batteries practically on fire.
[21:26] <ibanezmatt13> C'est pas bon
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[21:27] <ibanezmatt13> Gonna try disabling the screen, if that's possible with CHDK. Might be worth just gaffer taping the camera to the side of the box instead of having it inside.
[21:31] <chrisstubbs> Howdy ibanezmatt13
[21:31] <ibanezmatt13> Hey Chris, problems on the camera front... :/
[21:31] <chrisstubbs> set_backlight(0)
[21:31] <chrisstubbs> you might have to do that a couple of times with a delay(500) in between
[21:31] <ibanezmatt13> oh awesome! That's saved some googling.
[21:32] <chrisstubbs> sometimes the backlight wakes itself up
[21:32] <ibanezmatt13> right, I'll give that a go. Does backlight 0 also turn the screen off? Or is that the same thing? :P
[21:32] <chrisstubbs> I think it turns the whole screen off
[21:32] <ibanezmatt13> awesome, thank!
[21:32] <ibanezmatt13> +s
[21:33] <chrisstubbs> the other hack is to jam a bit of pen (plastic) in the AV out socket of some cameras to disable the lcd
[21:33] <ibanezmatt13> Good idea, but I think I'll try it electronically first, a little easier
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[21:34] <ibanezmatt13> I still think we're gonna have to do something about the box. With the lack of convection up there I just can't see it not overheating. I'll sort the screen thing, do some more testing, then take it from there
[21:35] <chrisstubbs> Recording video is probably the most intensive thing you can get it to do, so I'm not surprised it gets hot
[21:35] <chrisstubbs> someone like arko might be able to offer advice for getting heat out of it though
[21:36] <ibanezmatt13> Yeah, I've just been speaking to him :)
[21:36] <chrisstubbs> hand warmer one side for the tracker, dry ice the other for the camera ;)
[21:36] <Oddstr13> on the bright side, the batteries don't die due to the cold :P
[21:36] <ibanezmatt13> yeah exactly Oddstr13
[21:36] <ibanezmatt13> chrisstubbs, one good thing about my box design is that the electronics are 100% separate from the camera
[21:37] <ibanezmatt13> see http://sdrv.ms/1aT7ais
[21:37] <chrisstubbs> oo neat work with the foam
[21:37] <ibanezmatt13> yeah, just a shame I'm gonna have to bodge it quite a bit
[21:37] <arko> i'd say try to get rid of whatever is causing the heat, expose to the world (cold) is good, worst case is a heat sink on the side, but thats just crazy talk
[21:38] <ibanezmatt13> yes arko, exposing to the world is gonna have to happen I'm sure. Doing the screen disabling now
[21:38] <arko> yeah
[21:38] <ibanezmatt13> chrisstubbs, https://github.com/ibanezmatt13/NORB_3/blob/master/software/CHDK/NORB.bas should do the trick
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[21:38] <arko> you need barely any power to take a picture and store to sd card
[21:38] <arko> gl, ok back to work for me
[21:38] <chrisstubbs> Oh this is ubasic
[21:39] <ibanezmatt13> yep, does that affect that command for backlight?
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[21:40] <chrisstubbs> set_backlight 0
[21:40] <ibanezmatt13> right, just uploading now
[21:41] <chrisstubbs> http://chdk.wikia.com/wiki/Script_commands#set_backlight.28.29
[21:41] <chrisstubbs> looks like its just the backlight
[21:41] <ibanezmatt13> yeah looks like it. Trying out now
[21:42] <ibanezmatt13> okay
[21:42] <ibanezmatt13> screen flashed a few times off but stayed on as it begun recording
[21:43] <tweetBot> @M0TFC: HAB protype being inspected by club members. #hamr #hamradio #ukhas http://t.co/ew5K4kviO2
[21:44] <ibanezmatt13> I'll try to turn it off a few more times before recording loop starts
[21:44] <chrisstubbs> does the code stop when the recording starts?
[21:44] Action: chrisstubbs reads it
[21:44] <ibanezmatt13> shouldn't do
[21:44] <ibanezmatt13> should keep looping checking recording duration
[21:45] <Laurenceb_> LeoBodnar: how goes the GPS?
[21:45] <chrisstubbs> try throwing in a sleep 1000 then disbaling before entering that loop
[21:45] <ibanezmatt13> ok will do. Might be the case it automatically turns the screen on when recording begins
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[21:47] <ibanezmatt13> nope chrisstubbs
[21:47] <chrisstubbs> sorry I meant the do loop not the :loop loop
[21:47] <chrisstubbs> just to make it clear
[21:47] <ibanezmatt13> ooh I see, ok
[21:48] <chrisstubbs> set_lcd_display 0 turns the whole thing off, but I cant imagine the unlit LCD uses much power
[21:48] <ibanezmatt13> So in the :loop, just before the do, sleep 500, loop?
[21:49] <chrisstubbs> Yep that should do it
[21:49] <ibanezmatt13> ok
[21:49] <ibanezmatt13> might be worth trying the second command, less power the better
[21:50] <ibanezmatt13> ok, screens off
[21:50] <ibanezmatt13> good sign
[21:50] <cm13g09> mfa298: ping
[21:50] <mfa298> cm13g09: pong
[21:50] <DL7AD> Lunar_Lander: ping
[21:51] <ibanezmatt13> chrisstubbs, YES! :D Sorted!
[21:51] <chrisstubbs> whoop
[21:52] <ibanezmatt13> regarding power reduction, probably not much more I can do
[21:52] <ibanezmatt13> So if it overheats now which it probably still will, it's "destroy box" time
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[21:57] <Lunar_Lander> hello DL7AD
[21:57] <ibanezmatt13> chrisstubbs, been running it for 3 minutes no screen, can just start to feel the heat coming through the side of the camera :/
[21:57] <LeoBodnar> Laurenceb_: I get very intermittent results from sats from sample to sample
[21:58] <Laurenceb_> what do you mean sample to sample?
[21:58] <Laurenceb_> oh - if you do a longish recording?
[21:59] <Laurenceb_> sounds like AGC issues if that is the case
[21:59] <LeoBodnar> if I take samples with a few sec interval I get one sat booming and the rest are subdued, same later on
[22:00] <LeoBodnar> another sat next time
[22:00] <LeoBodnar> not sure what to make of it
[22:00] <LeoBodnar> maybe need proper good antenna
[22:00] <chrisstubbs> ibanezmatt13, maybe this is why there is a limit :(
[22:00] <ibanezmatt13> mm, almost certainly
[22:02] <ibanezmatt13> Maybe it's the case I have to mod the script so it takes some video, then some pics, to break the power issue up a little
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[22:02] <Laurenceb_> LeoBodnar: i'd try getting to board to run off a battery and save to ram
[22:02] <Laurenceb_> then dump later if its possible
[22:02] <Laurenceb_> usb can be nasty
[22:03] <chrisstubbs> yeah maybe, you could experiment and see if dropping the framerate/resolution changes anything
[22:03] <LeoBodnar> it is
[22:03] <ibanezmatt13> Maybe yeah. Just a shame as we wanted to catch video footage of the burst
[22:03] <chrisstubbs> its probably the sensor getting hot
[22:03] <LeoBodnar> it's very weird
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[22:04] <ibanezmatt13> I take the batteries out chris and they acutally burn to hold. Two today have been thrown out of my window! Might have to change the way we do it
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[22:05] <chrisstubbs> Are these lithiums?
[22:05] <ibanezmatt13> yep
[22:05] <ibanezmatt13> yeah it's starting to get pretty warm already...
[22:05] <ibanezmatt13> been running less than 15 mins
[22:06] <ibanezmatt13> I think chrisstubbs I'm taxing the camera too much with constant video for 2 hours.
[22:06] <chrisstubbs> It might be more of a case of the camera heating the batteries up, I cant imagine those lithiums getting that hot without just being shorted
[22:06] <ibanezmatt13> probably
[22:06] <chrisstubbs> :(
[22:07] <chrisstubbs> well you can still get some great stills with that
[22:07] <ibanezmatt13> ok, no worries. You gotta just get on with it... I'll have a think about doing part video part pics for the flight. Might miss the burst but oh well, out first flight got an awesome shot of the burst
[22:07] <ibanezmatt13> yep
[22:07] <Oddstr13> wouldn't that be rather easy to check? hook the battery up externaly
[22:08] <ibanezmatt13> I tested the current draw under full HD recording Oddstr13 as you said a few days ago, only 0.8A... strangely
[22:08] <Oddstr13> okay
[22:09] <Oddstr13> 800mA is quite a bit of power tho
[22:09] <ibanezmatt13> What I have realised however from a vid on Youtube, the control circuitry for the camera is right above the batteries
[22:09] <ibanezmatt13> that could be warming the batts up, as you say chrisstubbs
[22:09] <Oddstr13> if you connect the battery externaly, you can certently find out if it's the batteries or the camera itself
[22:10] <chrisstubbs> l91 has 90.21 ohms IR worst case
[22:10] <ibanezmatt13> Not sure what you mean Oddstr13, I can't access the terminals within the cam without making dummy battery
[22:10] <chrisstubbs> *0.21
[22:10] <ibanezmatt13> lol, 90 is quite excessive :)
[22:11] <Oddstr13> ibanezmatt13: no springs to hook onto?
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[22:11] <ibanezmatt13> I haven't thought of that actually. Might be feasible
[22:11] <steve_2e0vet> hi all is bluetooth on arduino stable??
[22:11] <ibanezmatt13> looking at it, you possibly could do that
[22:12] <Oddstr13> ^^
[22:13] <ibanezmatt13> I think I'll leave tonight's testing there. Made a fair bit of progress turning the screen off
[22:14] <Oddstr13> that should certently increase battery time a bit
[22:14] <ibanezmatt13> Tomorrow, I'll try hooking something onto the terminals to test which of the batts and cam get hot first, as you say Oddstr13
[22:14] <Oddstr13> ^^
[22:14] <ibanezmatt13> yeah, battery time wasn't really an issue in the end, just the heating issue
[22:14] <Oddstr13> yep
[22:15] <ibanezmatt13> I think in the end it'll come down to me mixing video and stills together. Still, a few nice stills with the odd short video clip would be nice. Short video clips of around 60 seconds should tax the camera components less if there's enough delay between
[22:18] <chrisstubbs> ibanezmatt13, if you want to scare youself I think you can log the image sensor temp
[22:18] <ibanezmatt13> I read about that, decided not to scare myself :)
[22:18] <ibanezmatt13> though now out of curiosity, might end up trying it
[22:19] <chrisstubbs> "get_temperature 0", 0 returns optical, 1 returns CCD, and 2 returns battery temp
[22:19] <ibanezmatt13> worth a try I think
[22:19] <ibanezmatt13> I can log it to a file on the SD?
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[22:21] <mikestir> ibanezmatt13: I found the results from the load testing I did on the wggs1 camera if you want them
[22:22] <ibanezmatt13> That'd be great mikestir, good to have some data for a comparison :)
[22:22] <mikestir> https://docs.google.com/spreadsheet/ccc?key=0Aq-JTzPFIDKVdFplaUNmQTMxT0hNTERUUWRTa2QyMlE&usp=sharing
[22:22] <ibanezmatt13> cheers!
[22:22] <mikestir> getting the lcd to turn off is a big bonus
[22:23] <mikestir> I think some cameras you can do that in the software, but the one we had you could do it by plugging an unwired jack plug into the AV out socket
[22:23] <ibanezmatt13> yeah, chrisstubbs mentioned that earlier :)
[22:23] <ibanezmatt13> those temps in deg c?
[22:23] <mikestir> that's current. didn't measure temperature
[22:24] <mikestir> you were saying you saw 800 mA continuous?
[22:24] <ibanezmatt13> yes
[22:24] <ibanezmatt13> full HD recording that was
[22:24] <mikestir> whereas I only ever saw that high during an exposure
[22:24] <mikestir> ah right, well this was for full res stills at 10 second intervals
[22:25] <ibanezmatt13> right, still a good comparison
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[22:26] <ibanezmatt13> I think I'd better be off to sleep, long day today
[22:26] <ibanezmatt13> catch you later :) Thanks for the help too
[22:26] <chrisstubbs> laters matt
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[22:52] <DL7AD> http://www.youtube.com/watch?v=OtzdSnPJI_c :P
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[22:54] <LeoBodnar> destroy - verb [ trans. ] put an end to the existence of (something) by damaging or attacking it
[22:55] <LeoBodnar> scratch - verb [ trans. ] score or mark the surface of (something) with a sharp or pointed object
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[22:55] <LeoBodnar> heh
[22:56] <Lunar_Lander> XD
[22:56] <Oddstr13> now, recursivly look up the words in the definitions!
[22:56] <natrium42> Guten Morgen, Lunar_Lander
[22:57] <Lunar_Lander> hello natrium42 and Oddstr13 and LeoBodnar
[22:57] <Oddstr13> o/ Lunar_Lander
[22:58] <LeoBodnar> yo Lunar_Lander
[22:58] <nats`> morgen natrium42 ?
[22:59] <nats`> :)
[22:59] <nats`> what time is it ? :D
[22:59] <Lunar_Lander> I wonder
[22:59] <LeoBodnar> what's French for good morning?
[22:59] <nats`> not really used
[22:59] <Lunar_Lander> is it OK to show you the Kickstarter project of a friend of mine?
[22:59] <nats`> Bonne matinée
[22:59] <nats`> but usually you say Bonjour
[22:59] <nats`> means good day in one word
[23:00] <Lunar_Lander> he is working on a gun launched probe/rocket for high atmosphere research, like the Project HARP of the 1960s
[23:00] <LeoBodnar> ok, I love how important it is here whether it is 11:59 or 12:01
[23:01] <nats`> it's now morning :D
[23:01] <Lunar_Lander> https://www.kickstarter.com/projects/1682852725/the-starfire-space-cannon here it is
[23:02] <qyx_> lol plz ks
[23:03] <LeoBodnar> Is it ethical to fund a new way to fund creative projects on Kickstarter?
[23:04] <Lunar_Lander> hmm
[23:05] <nats`> could I use it to put my neighboor on fire ?
[23:05] <Lunar_Lander> xD
[23:05] <LeoBodnar> Only if done humanely
[23:06] <nats`> uhhmmmmmmm noway !
[23:09] <Laurenceb_> the starfire thing doesnt make sense
[23:09] <Laurenceb_> e.g. how will you circularize the orbit?
[23:09] <Laurenceb_> also not enough delta v from a gun
[23:10] <LeoBodnar> no time for minor details Laurenceb_ !
[23:10] <Lunar_Lander> in HARP they wanted to fire a three stage solid-fuel rocket from the gun
[23:10] <Lunar_Lander> using the gun as stage 0
[23:10] <Laurenceb_> yeah
[23:10] <Laurenceb_> rather more complex and harder
[23:10] <Lunar_Lander> I suppose he wants to do it too
[23:10] <Laurenceb_> you could just use a rockoon :P
[23:10] <Lunar_Lander> yea :)
[23:11] Action: Laurenceb_ is wondering how to seal his SLS nylon parts for pneumatic use
[23:11] <Lunar_Lander> I mean I know him for some time now and he seems to have worked on that for a long time
[23:11] <Lunar_Lander> even asked me if I have experience about kickstarter
[23:11] <Lunar_Lander> so I just wanted it to show you :)
[23:13] <Laurenceb_> ok
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[23:17] <Laurenceb_> heh i see "Martlet 1"
[23:17] <Laurenceb_> http://www.astronautix.com/graphics/m/martlet1.jpg
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[23:18] <Lunar_Lander> yea :)
[23:18] <Lunar_Lander> wasn't used for long before being replaced by Martlet 2
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[23:30] <Laurenceb_> Lunar_Lander: what is that gun powered by?
[23:30] <Laurenceb_> gas?
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[23:34] <Lunar_Lander> loaded with gunpowder and then ignited
[23:34] <Lunar_Lander> like the HARP gun back in the 60s
[23:38] <Laurenceb_> hmm
[23:40] <Lunar_Lander> but I know of the SHARP project with the Hydrogen ignition
[23:40] <Lunar_Lander> https://en.wikipedia.org/wiki/Super_High_Altitude_Research_Project
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[23:42] <Laurenceb_> yeah, seems more sensible
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[00:00] --- Mon Feb 3 2014