highaltitude.log.20090405

[00:00] <Laurenceb> SpeedEvil: those post are interesting
[00:00] <Laurenceb> you know doug launched a payload over the summer?
[00:01] <Laurenceb> its a small internet :P
[00:03] <DanielRichman> If the camera and the mcu are powered by separate batteries, is it still a bad idea to use transistors to control the camera switches? Optoisolators?
[00:05] <Laurenceb> if you tie the two grounds together
[00:05] <Laurenceb> its prob ok
[00:05] <natrium42> you only need optoisolators if you expect power spikes
[00:05] <Laurenceb> use a multimeter to measure the voltage across the cam trigger
[00:05] <Laurenceb> I dont believe it... durrrr
[00:06] <Laurenceb> sparkfun sell CC1100 module
[00:06] <DanielRichman> so transistors are ok?
[00:06] <DanielRichman> that would make things simpler
[00:06] <Laurenceb> yeah
[00:06] <DanielRichman> great
[00:08] <Laurenceb> measure the voltage across the wires
[00:11] <Laurenceb> tie the "-ive" line to arduino ground
[00:11] <shellevil> also
[00:11] <shellevil> find if the switch also works with a 500 ohm resistor in series
[00:12] <shellevil> if you put your electronic switch in series with two 220R resistors on each side, you'll reduce the chances of damage on oopse.
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[00:19] <Laurenceb> cya all
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[07:49] <rjharrison> morning all
[07:50] <rjharrison> any
[07:50] <rjharrison> one planning a launch today?
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[07:57] <mc-> morning all
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[09:45] <edmoore> morning all
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[10:23] <SpeedEvil> edmoore: pics or it diddn't happen.
[10:23] <SpeedEvil> edmoore: :)
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[10:42] <DanielRichman> rjharrison, your guide for hacking a Canon Ixus 400 helped me greatly (even though we're using a Powershot A80). Thanks! One question though: the potential-difference between legs of the shutter is about 0.08 on the multimeter, that's ok?
[10:45] <rjharrison> DanielRichman: To be honnest i'm not sure. I'm no expert just found out what worked and documented it
[10:46] <rjharrison> I'm really glad you found the guide usefull
[10:46] <rjharrison> I think you are the first person to use it. Or at least thank me for it.
[10:46] <DanielRichman> Well, I saw the note on the bottom, and thought I'd say hi on IRC :)
[10:47] <rjharrison> The be honnest I have gone for CHDK software on the recent launches but will probably go back to hard wire later
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[11:43] <Jcoxon> Hey guys
[11:44] <g8khw> The hf tx is up and transmitting on 7'0141
[11:44] <Jcoxon> Any one around to vnc into my laptop
[11:44] <g8khw> I'll tell u when it starts
[11:44] <Jcoxon> ?
[11:44] <Jcoxon> As i'm away
[11:46] <g8khw> Ok ta
[11:46] <g8khw> now
[11:47] <Jcoxon> Steve i.no be home by 3.30. Will tune then.
[11:47] <Jcoxon> I'll
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[11:47] <g8khw> Ok np
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[12:06] <Laurenceb> hi
[12:06] <g8khw> Tis on agaii
[12:06] <g8khw> N
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[12:31] <g8khw> Transmitting now
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[12:49] <sbasuita> Anybody know where jcoxon is (america?)/when he's getting back?
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[12:49] <edmoore> g8khw: there's a lorra qrm about
[12:50] <g8khw> Oh
[12:51] <g8khw> It's not p
[12:51] <edmoore> ?
[12:51] <g8khw> On
[12:51] <edmoore> ok
[12:51] <g8khw> Now
[12:51] <edmoore> well I've got it all set up here
[12:51] <edmoore> is it in the 3-min down cycle?
[12:51] <g8khw> I'll let u know next
[12:52] <g8khw> Yep
[12:52] <edmoore> i'll hopefully see it on the waterfall
[12:52] <g8khw> Now
[12:53] <edmoore> what's the rtty spacing?
[12:57] <g8khw> 170
[12:58] <g8khw> 45.45 has
[12:58] <g8khw> Baud
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[13:01] <g8khw> Ita2 -tee tttt
[13:01] <g8khw> True TTY 5 bit
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[13:01] <g8khw> Now
[13:02] <g8khw> It's sending now
[13:03] <edmoore> there's some much lower cw on the same freq
[13:03] <edmoore> can't really make you out
[13:04] <g8khw> I'm gonna turn it off 4 a bit
[13:04] <edmoore> ok
[13:05] <g8khw> Wait 4 the. Coxon
[13:06] <edmoore> any good rockets yet?
[13:11] <g8khw> A few models so far
[13:11] <edmoore> anything HPR being prepped?
[13:11] <g8khw> It's off now (tx)
[13:12] <edmoore> ok
[13:12] <g8khw> I'll take a look
[13:12] <g8khw> Bbl
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[14:02] <Laurenceb> http://www.sparkfun.com/commerce/categories.php?c=113
[14:07] <Laurenceb> pity they've sold out
[14:07] <Laurenceb> still no GS406 modules either :-/
[14:08] <Laurenceb> I might email them and ask
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[15:36] <jcoxon> hey all
[15:36] <jcoxon> what freq is G8 transmitting on?
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[15:38] <jcoxon> g8khw,
[15:38] <jcoxon> i'm back now
[15:38] <Laurenceb> is there a balloon in the air?
[15:39] <Laurenceb> jcoxon: ping
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[15:39] <jcoxon> Laurenceb,
[15:39] <jcoxon> how can i help?
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[15:40] <Laurenceb> G8 is flying?
[15:40] <jcoxon> no
[15:40] <jcoxon> its the HF transmitter test
[15:40] <Laurenceb> oh ok
[15:40] <Laurenceb> cool, I've gtg, cya
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[15:42] <sbasuita> jcoxon, hi!
[15:42] <jcoxon> sbasuita, hi
[15:42] <sbasuita> jcoxon, just wondering about the status of that transceiver you said you might be able to dig up for us?
[15:43] <jcoxon> yeah its still being used
[15:43] <jcoxon> i reckon one more week
[15:44] <sbasuita> jcoxon, ok, cool
[15:44] <jcoxon> is that okay?
[15:47] <sbasuita> jcoxon, should be fine - we're just itching to do something ;)
[15:47] <jcoxon> got the gps working?
[15:47] <jcoxon> phone?
[15:47] <sbasuita> jcoxon, gps is working yes
[15:48] <sbasuita> jcoxon, waiting on a cable for the phone
[15:48] <sbasuita> jcoxon, camera has been hacked
[15:48] <jcoxon> sounds like good progress
[15:48] <jcoxon> what protocol are you planning to use over the radio?
[15:48] <sbasuita> jcoxon, ukhas
[15:49] <sbasuita> rtty ascii-7
[15:49] <jcoxon> oh right
[15:49] <jcoxon> thats what i meant
[15:49] <sbasuita> We'll probably go 50-baud, cause that's what everybody else is doing
[15:49] <jcoxon> sounds sensible, not like you are sending lots of data
[15:49] <sbasuita> yep
[15:50] <g8khw> R u ready
[15:50] <jcoxon> yup
[15:50] <jcoxon> what freq?
[15:50] <sbasuita> I can't hear joo
[15:53] <sbasuita> I am struggling to take this site seriously.... http://www.hamradio.com/
[15:54] <jiffe20> are these custom radios, or is 50 baud common?
[15:54] <jcoxon> jiffe20, they are radiometrix ntx2 modules
[15:55] <sbasuita> How much would it cost to get a no-frills transceiver?
[15:55] <jcoxon> you need SSB so ?100
[15:56] <sbasuita> Mmmm... probably not going to happen right now ;(
[15:59] <g8khw> Stout to tx
[15:59] <jcoxon> freq?
[15:59] <g8khw> About
[15:59] <g8khw> 7.0141
[15:59] <g8khw> Now
[16:00] <g8khw> Re
[16:00] <g8khw> Rtty now
[16:00] <jcoxon> hmmm nothing
[16:00] <g8khw> Mfsk
[16:01] <g8khw> Tis off now
[16:01] <jcoxon> didn't get anything
[16:01] <g8khw> I'll let u know when it starts again
[16:01] <jcoxon> okay
[16:01] <jcoxon> so 70141000
[16:01] <jcoxon> LSB
[16:01] <jcoxon> RTTY and MFSK
[16:01] <g8khw> 4 min cycle
[16:03] <g8khw> Yes
[16:03] <g8khw> hnow
[16:04] <g8khw> Now
[16:04] <g8khw> Rtty
[16:04] <g8khw> Mfsk
[16:05] <g8khw> Off
[16:05] <jcoxon> g8khw, i'm getting nothing
[16:06] <g8khw> 7.01394 lsb
[16:06] <jcoxon> there is some CW
[16:07] <g8khw> Not yet
[16:08] <g8khw> Cw now
[16:08] <jcoxon> short burst?
[16:08] <g8khw> Rtty now
[16:09] <g8khw> Mfsk
[16:09] <g8khw> Off
[16:09] <jcoxon> nothing
[16:09] <jcoxon> i'll call one sec
[16:09] <g8khw> Ok
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[16:14] <jcoxon> ping natrium42
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[16:24] <jcoxon> g8khw, go to #hamradio
[16:38] <jcoxon> haha mass exodus to #hamradio
[16:38] <jcoxon> a guy in Germany picked it up for us
[16:38] <sbasuita> jcoxon, indeed
[16:38] <SpeedEvil> neat.
[16:38] <jcoxon> http://dl0tud.tu-dresden.de/~dj1yfk/7014.wav.mp3
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[16:39] <SpeedEvil> a bit fadey
[16:39] <SpeedEvil> anyone tried decoding it?
[16:39] <SpeedEvil> it sounds quite readable
[16:39] <SpeedEvil> This is the transmitter on a string test?
[16:40] <jcoxon> yeah
[16:40] <SpeedEvil> alt?
[16:40] <jcoxon> 60m
[16:41] <natrium42> hey
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[16:41] <jcoxon> hey natrium42
[16:41] <jcoxon> hf transmitter is up
[16:41] <jcoxon> wondering if you could listen in
[16:42] <natrium42> yeah, ok
[16:42] <jcoxon> 7.01410
[16:42] <jcoxon> LSB
[16:42] Action: SpeedEvil had relatives up for ashes scattering ceremony.
[16:43] <SpeedEvil> In random conversation, teddy-launch came up.
[16:43] <jcoxon> its on a 4 minute cycle of CW, RTTY, MFSK then off for 4 mins
[16:43] <g8khw> Tx now
[16:43] <g8khw> Cw
[16:43] <jcoxon> SpeedEvil, those teddys are famous
[16:43] <g8khw> Rtty
[16:43] <SpeedEvil> jcoxon: indeed.
[16:44] <g8khw> Mfsk now
[16:44] <SpeedEvil> And at least that's the formality over. Now back to getting used to it.
[16:44] <g8khw> Off
[16:44] <SpeedEvil> And eventually balloons!
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[16:44] <jcoxon> SpeedEvil, ;)
[16:45] <SpeedEvil> I note that http://partyfromabox.co.uk/teddyinaballoon beats you on 'teddy balloon' on google
[16:46] <SpeedEvil> I hadn't seen the teddy pics before - cute.
[16:47] <g8khw> Cw now
[16:48] <g8khw> Rtty now
[16:48] <g8khw> Mfsk now
[16:51] <natrium43> i don't hear anything, sorry
[16:52] <g8khw> Cw now
[16:52] <g8khw> Rtty
[16:52] <g8khw> Mfsk
[16:53] <g8khw> Ok going to bring it now
[16:53] <jcoxon> okay
[16:54] <g8khw> Going to release the balloon
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[16:55] <jcoxon> natrium43, no worries, someone in Germany picked it up for us and recorded the transmission
[17:02] <jcoxon> thats 1000km
[17:02] <jcoxon> :-)
[17:02] <jcoxon> well 961km
[17:02] <shellevil> seems decodaable - from audio - is it?
[17:02] <shellevil> what's the antenna on the .deside?
[17:03] <jcoxon> just writing that up
[17:03] <jcoxon> 3 ele yagi :-p
[17:03] <shellevil> ppity, in a way
[17:03] <jcoxon> he also tried with the vertical, still decodable
[17:03] <shellevil> :)
[17:04] <shellevil> tx W?
[17:04] <jcoxon> i think its 2 or 3W
[17:07] <jcoxon> its was a good test
[17:07] <jcoxon> though propergation is mean
[17:07] <jcoxon> i'm too close
[17:09] <shellevil> You mean you can't pick it up?
[17:10] <shellevil> oh - it's got to propagate some to get into the duct hasn't it
[17:10] <shellevil> or something
[17:10] <jcoxon> yeah i can't pick it up
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[17:10] <jcoxon> it basically is jumping over me
[17:10] <jcoxon> but then i can easily pick up russia and poland for example
[17:10] <Hiena> ' evening!
[17:10] <jcoxon> hey Hiena
[17:10] <shellevil> Evening.
[17:11] Action: shellevil is hungary.
[17:11] Action: shellevil has sausages and mash on way.
[17:11] <shellevil> Or potatos, depending on how much I can bother.
[17:12] <Hiena> Well, the telemetry succesfully tested. two sucessfull flight from eight start.
[17:12] <Hiena> Have to clean my engine, and fing s better airscrew.
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[17:21] <shellevil> random question - anyone into crossbows?
[17:21] Action: shellevil is pondering a vertically launched camera
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[17:32] <edmoore> hi jcoxon
[17:32] <jcoxon> hey edmoore
[17:32] <edmoore> cool news re: germany
[17:33] <jcoxon> yeah
[17:33] <jcoxon> its the guy who wrote the original sstv code
[17:33] <jcoxon> but yeah thats 950km :-D
[17:34] <edmoore> not bad!
[17:34] <jcoxon> good day at EARS?
[17:35] <edmoore> not much launching for such a nice day
[17:35] <edmoore> but nice to not revise
[17:35] <edmoore> did me good i think
[17:36] <edmoore> got a week's dose of sunlight
[17:36] <jcoxon> :-)
[17:36] <natrium42> but the question is: how quickly could you launch if you had to?
[17:37] <natrium42> few hours?
[17:37] <jcoxon> natrium42, today is rocket day at EARS
[17:39] <natrium42> cool
[17:39] <jcoxon> natrium42, did you get that email i just forwarded to you about permission?
[17:39] <natrium42> yep
[17:40] <natrium42> i forwarded it to sYx66
[17:42] <jcoxon> oh cool
[17:46] <natrium42> jcoxon, started work on the iridium system yesterday
[17:46] <natrium42> dialing into a modem is working
[17:46] <jcoxon> great
[17:46] <jcoxon> that was easy
[17:47] <jcoxon> :-D
[17:47] <natrium42> yeah, much easier than to mess with ppp
[17:47] <SpeedEvil> randomly: http://www.peroxidepropulsion.com/
[17:47] <SpeedEvil> 90%H2O2 delivered
[17:47] <natrium42> now i need to write a simple packet system for atmega
[17:47] <edmoore> SpeedEvil: that's not bad
[17:47] <sYx66> thanks
[17:48] <SpeedEvil> edmoore: no - I've asked how much shipping is on one drum. I expect it to be murderous - but meh.
[17:48] <SpeedEvil> I've got a couple of drums of 35% - probably decomposed a bit by now - but vacuum distilation is something I'd rather avoid.
[17:49] <edmoore> and the drums
[17:49] <SpeedEvil> ?
[17:49] <edmoore> nvm :p
[17:53] <SpeedEvil> Though in many ways I'd prefer Lox, but I can't get that delivered.
[17:56] <SpeedEvil> Lox+alcohol is nice in that there isn't any cleaning
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[18:17] <Hiena> SpeedEvil, build a refinery.
[18:18] <Hiena> Heat exchangers a handfull picle jar and thats all.
[18:19] <Hiena> First you have to boil it and cool down 2 degree at every step.
[18:19] <Hiena> If you doing right at 52 degree you wil get the finest peroxide.
[18:19] <natrium42> mmh, peroxide
[18:20] <Hiena> Here the pure peroxide requires a several licence, but the 35% one is free to buy.
[18:22] <Hiena> My cone refinery, before it was smashed, made a fine pure peroxide in 6 stage.
[18:23] <shellevil> smashed?
[18:37] <Hiena> Yup. Three years ago, i stocked several test equipment behind my house (hydrogen generator, eroxide refinery, ammonium-nitrate grinder, etc.)
[18:38] <Hiena> At one springtime some gipsies came, and stealed the nitrate grinder, the hydrogen generator (it was stainless steel) and smashed all glassware.
[18:39] <shellevil> :/
[18:39] <shellevil> eroxide?
[18:39] <Hiena> means peoxide.
[18:39] <Hiena> +r
[18:39] <shellevil> ah
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[20:14] <edmoore> jcoxon: did you get even so much as a ticnkle today?
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[20:44] <edmoore> hi G8KHW
[20:44] <G8KHW> hey edmoore & jcoxon - a massive thank you both for help today
[20:44] <edmoore> it was an amazing day. would have been wasted on revision.
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[20:44] <G8KHW> yeah - I was really happy today
[20:45] <G8KHW> it all went amazingly well and I mana
[20:45] <rjharrison> Did yoi launch?
[20:45] <rjharrison> I wish I wasn't on the stag dooi
[20:45] <rjharrison> would have monitored from here
[20:46] <edmoore> rjharrison: it was an Atalantic Halo radio test
[20:46] <edmoore> tethered
[20:46] <edmoore> james couldn't hear it in london but perfect copy in germany, I understand
[20:46] <edmoore> that's propagation for you
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[20:47] <G8KHW> yeah amazing
[20:48] <G8KHW> jcoxon: any idea where in germany the guy was?
[20:50] <jcoxon> G8KHW, munich
[20:50] <jcoxon> so 950km
[20:50] <G8KHW> oh wow
[20:51] <jcoxon> edmoore, i got absolutely nothing
[20:51] <edmoore> i didn't get much when it was tethered a bit lower
[20:51] <edmoore> not sure about when we let it out
[20:51] <edmoore> should have left it running really
[20:51] <G8KHW> I think you would had ir been a few K ft up
[20:51] <G8KHW> if
[20:52] <G8KHW> it had been
[20:53] <jcoxon> but its good news
[20:53] <jcoxon> thats a fair distance
[20:53] <edmoore> very
[20:53] <jcoxon> what power was it?
[20:53] <G8KHW> its a few hundred mw
[20:53] <jcoxon> oh really
[20:53] <jcoxon> i thought it was a few watts
[20:53] <G8KHW> na definatly not that much
[20:54] <jcoxon> oh just from my readying of the rockmite specs back when we were researching
[20:55] <jcoxon> DJ1YFK is often on #hamradio
[20:55] <jcoxon> and said he is happy to listen out when we launch
[20:56] <G8KHW> Ta - I'll thank him properly when I have a chance
[20:57] <G8KHW> small wonders expect 500mw from the rockmite at 12V - I think it was running at about 9V today
[20:58] <jcoxon> oh okay
[20:58] <jcoxon> so reckon it'll be okay for a trans-a flight?
[20:59] <edmoore> spirit of knox say they're going to put up everything they ever learnt on their site this month
[21:00] <jcoxon> oh thats great news
[21:00] <jcoxon> going to be a lot of info
[21:00] <jcoxon> oh does anyone have comments on the DLClient and Server? any ideas for improvements etc
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[21:02] <G8KHW> jcoxon:sure should be OK - needs some finishing off yet though
[21:02] <G8KHW> (frequency feedback loop)
[21:03] <jcoxon> okay great
[21:03] <G8KHW> that way it will correct for tempreture and power effects
[21:03] <G8KHW> temperature
[21:04] <edmoore> jcoxon: I like it as it is at the moment - nice and simple
[21:04] <edmoore> although if you want something for me to say, it's that the printed output when it's running is a bit wierdly formatted
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[21:04] <Laurenceb> hello
[21:04] <edmoore> could perhaps have a polish
[21:04] <edmoore> but I'm saying that just because I may aswell say something rather than nothing
[21:05] <edmoore> + exception handling
[21:05] <jcoxon> edmoore, yeah
[21:06] <jcoxon> if anyone gets a chance i'd appreciate someone to test the gps bit
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[21:06] <edmoore> sure yes, willdo
[21:07] <edmoore> on the server side, i guess integrated dynamic prediction would be cool
[21:07] <edmoore> infact integrating both tracking and prediction into one interface might be a good thing
[21:08] <jcoxon> yeah the big thing is to plot the listeners onto the map
[21:08] <jcoxon> and fix the problem with hte tracker and mysql
[21:09] <edmoore> is it sYx66 who is working on a general speed-up?
[21:09] <jcoxon> yeah
[21:10] <edmoore> something like an iphone-friendly version would be proper useful given how much tracking is done on the move. It's a really useful resource for the track team as much as anything
[21:12] <jcoxon> oooo yes
[21:12] <jcoxon> i've actually solved that
[21:12] <jcoxon> the new version of google maps can read kml files
[21:12] <edmoore> ah grand
[21:12] <jcoxon> so you can use the kml from the tracker's page
[21:12] <edmoore> and the rest is history
[21:12] <jcoxon> thats how i kept an eye on it while on the train
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[21:24] <mc-> g8khw, were my mites built ok¿
[21:26] <SpeedEvil> I commented on the mailing list that dry ice is relatively unknown in the UK.
[21:26] <SpeedEvil> Has anyone ever seen it in normal shops?
[21:27] <SpeedEvil> as something the man on the street might go in and buy a few kilos of?
[21:27] <edmoore> SpeedEvil: not in shops, but certainly mail order when I used to work at a theatre
[21:27] <edmoore> you just get a polystyrene box full of several kilos
[21:27] <SpeedEvil> yeah.
[21:28] <SpeedEvil> I'm not saying it's hard to get - just much harder than the states for some reason.
[21:28] <SpeedEvil> where it's a retail item
[21:30] <jcoxon> edmoore, do you use Eagle Light for your boards?
[21:30] <edmoore> you could dump a fire extinguisher into a sock
[21:30] <edmoore> yes
[21:30] <edmoore> unless it's 4-layer
[21:31] Action: SpeedEvil finds 'pcb' quite easy to work with. Once you get used to it.
[21:31] <jcoxon> how do you rotate objects?
[21:31] <edmoore> right click
[21:31] <jcoxon> yeah but i get a 'not a feature in light'
[21:31] <edmoore> oh
[21:31] <SpeedEvil> ...
[21:31] <SpeedEvil> That's pretty fundamental
[21:31] <edmoore> this is guess is on pcb layout rather than schematic layout
[21:31] <edmoore> ?
[21:31] <edmoore> this, I guess, is *
[21:31] <jcoxon> oh wait
[21:32] <jcoxon> it was outside the 'box'
[21:32] <jcoxon> as in the allowed board size
[21:32] <edmoore> because you can't rotate it outside the box in pcb layout
[21:32] <edmoore> correct
[21:32] <edmoore> move it first
[21:32] <jcoxon> done
[21:32] <jcoxon> thanks
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[21:35] <edmoore> my external hdd is making scraping noises
[21:35] <edmoore> I think that's a bad thing
[21:36] <jcoxon> yeah
[21:36] <jcoxon> hd death rattle
[21:37] <SpeedEvil> Oh noes!
[21:37] <SpeedEvil> not the fan?
[21:38] <edmoore> it doesn't have a fan
[21:39] <SpeedEvil> :/
[21:39] <edmoore> I think I might upgrade the mbp to 320gb. then I can stop faffing around trying to offload flight data to other machines
[21:39] <edmoore> nova11 generated about 10gigs of crap
[21:39] <edmoore> but the stamp collector in me wants to keep it all raw
[21:39] <SpeedEvil> :)
[21:39] <SpeedEvil> BTDT
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[21:41] Action: SpeedEvil wonders what the scattering function for the atmosphere looks like
[21:41] <SpeedEvil> Obviously looking sideways from 35Km through 100Km of air is gonna be blurry, even in clear skies.
[21:41] <SpeedEvil> Does enough get through that you can in principle remove some of the haze?
[21:42] <edmoore> SpeedEvil: http://www.tracking-station.de/images/iss/2007-12/iss2007-12-18a.mpg
[21:42] <edmoore> tangentially related
[21:42] <jcoxon> 10gbs!
[21:42] <edmoore> but cool
[21:42] <jcoxon> edmoore, get good pics?
[21:43] <jcoxon> oh also edmoore what was the final landing site?
[21:43] <edmoore> 52.2805, 0.15175
[21:43] <edmoore> jcoxon: nice pics, but you'll have to wait ;)
[21:44] Action: SpeedEvil realises why blue light looks so dazzley at night after looking at the scotopic and photopic response functions.
[21:45] <jcoxon> why is something special going to happen?
[21:46] <edmoore> no, just they were sponsor pics and they want to do stuff with them first
[21:46] <edmoore> it's not that exciting
[21:46] <jcoxon> oh right
[21:46] <jcoxon> :-)
[21:46] <edmoore> but it might help fund us to work on the real stuff over the summer
[21:46] <jcoxon> oooo that good news
[21:47] <SpeedEvil> edmoore: related video is related! I suppose that's also the best case. As you've got an ideal background.
[21:48] <SpeedEvil> edmoore: vs trying to deconvolve all of it at once.
[21:49] <SpeedEvil> edmoore: also - http://tech.slashdot.org/article.pl?sid=08/08/27/021244 I suppose. (mirage binocs)
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[21:50] <edmoore> SpeedEvil: oh yeah, I saw that
[21:50] <edmoore> very cunning
[21:50] <SpeedEvil> I suspect you need a high zoom for it to work.
[21:54] <SpeedEvil> Aha! http://cgi.ebay.co.uk/650-1300mm-Telephoto-Zoom-Lens-for-Canon-EOS-Mount-EF_W0QQitemZ280328788473QQcmdZViewItemQQptZCamera_Lenses?hash=item280328788473&_trksid=p3286.c0.m14&_trkparms=72%3A1690|66%3A2|65%3A12|39%3A1|240%3A1308
[21:54] <SpeedEvil> (or not)
[21:55] <SpeedEvil> http://cgi.ebay.com/Canon-EOS-Rebel-S-35mm-Camera_W0QQitemZ190297184895QQcmdZViewItemQQptZFilm_Cameras?hash=item190297184895&_trksid=p3286.c0.m14&_trkparms=72%3A570|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50 No! Do not want!
[21:56] Action: SpeedEvil has too much crap already that he's gonna fix.
[21:58] <Hiena> Okay, the google-earth files online.
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[22:09] <edmoore> jcoxon: what are you designing?
[22:09] <edmoore> just OOI :)
[22:10] <jcoxon> an arduino shield
[22:11] <jcoxon> with lassen and radiometrix
[22:11] <edmoore> neat
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[22:14] <edmoore> !learn del CUSF
[22:14] <edmoore> !learn add cusf cusf: CU Spaceflight is a student-run Cambridge University society founded with the aim of achieving cheap access to space, http://www.cuspaceflight.co.uk
[22:15] <edmoore> !learn del cusf
[22:15] <edmoore> !learn add cusf CU Spaceflight is a student-run Cambridge University society founded with the aim of achieving cheap access to space, http://www.cuspaceflight.co.uk
[22:15] <edmoore> grumble
[22:16] <edmoore> we're not paying £4.50 a year for that website name for nothin :p
[22:16] <edmoore> ta
[22:16] <edmoore> does it have to be you jcoxon?
[22:16] <jcoxon> no i don't think so
[22:17] <jcoxon> just that zeusbot is a little bit random
[22:20] <edmoore> :)
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[22:21] <jcoxon> hmmm the lassen has annoying pullups
[22:21] <sbasuita> jcoxon, annoying?
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[22:25] <edmoore> does it?
[22:25] <sbasuita> edmoore, well, you need to pull up pins 3 and 6 if you're not using them - else the chip breaks
[22:26] Action: edmoore looks at what he did on badger...
[22:27] <edmoore> RXB (pin six) is floating on badger
[22:27] <edmoore> we just ignored uart b
[22:28] <sbasuita> edmoore, manual says bad idea
[22:28] <sbasuita> "Do not choose this
[22:28] <sbasuita> option for firmware
[22:28] <sbasuita> release 1.10.
[22:28] <sbasuita> Operation cannot be
[22:28] <sbasuita> guaranteed. Failure
[22:28] <sbasuita> modes: may never
[22:28] <sbasuita> produce a position fix,
[22:28] <sbasuita> may output potentially
[22:28] <sbasuita> bad fixes
[22:28] <sbasuita> intermittently
[22:29] <sbasuita> "
[22:29] <edmoore> oh well, we'll know for next time
[22:29] <edmoore> it's yet to fail us
[22:29] <jcoxon> sbasuita, hence annoying
[22:29] <jcoxon> :-)
[22:29] <sbasuita> jcoxon, mmm... but it's pretty straightforward
[22:29] <edmoore> and has had many hundred hours of operation, and probably several tens of flight hours
[22:31] <jcoxon> sbasuita, most gps modules don't require anything - thats the beauty of the m
[22:31] <jcoxon> them*
[22:31] <shellevil> that's the lassen?
[22:31] <edmoore> well, other than pullups on the primary uart
[22:31] Action: shellevil wonders if that's Laurencebs problem.
[22:32] <edmoore> where to start!?
[22:32] <edmoore> (joke, lb)
[22:34] <shellevil> Other than his unhealthy obsession with maths :)
[22:38] <Laurenceb> hello
[22:38] <Laurenceb> oi
[22:39] <edmoore> hrm, hallam had problems with the lassen with his surveyor expandsion board
[22:39] <edmoore> I wonder if that was it
[22:39] <Laurenceb> yeah my lassen has pullups
[22:40] <Laurenceb> I think I may know what the problem was - reading the datasheet it takes 30 seconds on no backup battery to wipe the RAM
[22:41] <Laurenceb> when it screwed up the position solution (RFI causing bad ephemeris?) I unplugged the battery for ~15 seconds
[22:41] <Laurenceb> on several occasions, that may have left corrupted RAM
[22:42] <edmoore> right bbl
[22:43] <Laurenceb> I've added a command to wipe the RAM in software now, so no more of that
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[22:54] <jcoxon> might email the list to tell of the exciting HF test
[22:55] <Laurenceb> did it work?
[22:55] <jcoxon> yeah
[22:55] <jcoxon> 950km it was picked up
[22:55] <Laurenceb> wow
[22:55] <Laurenceb> from the ground?
[22:55] <Laurenceb> what frequency?
[22:55] <jcoxon> 60m up on a tethered balloon
[22:56] <jcoxon> 7.01410MHz
[22:56] <Laurenceb> awsome
[22:56] <Laurenceb> power?
[22:56] <icez> hey guys, sorry to interrupt, but if you guys had a (small) supercomputer what would you do with it?
[22:56] <icez> :P
[22:56] <jcoxon> Laurenceb, under 500mW
[22:56] <sbasuita> icez, you have a small supercomputer don't you
[22:56] <edmoore> icez: what kind of supercomputer?
[22:56] <icez> sbasuita, well potentially :[
[22:57] <edmoore> like lots of gpus or a more conventional one?
[22:57] <icez> 3-node cluster, not sure which type yet
[22:57] <icez> 3 dual-core 64-bits PCs connected together basically
[22:58] <edmoore> we'd probably get it running monte-carlos for balloon flights every time new weather reports came out, and then email round a bunch of ellipses to us just to stay up to date
[22:58] <edmoore> but that's a boring use
[22:58] <icez> oh I should mention _besides_ running @home stuff
[22:58] <shellevil> If I had a small supercomputer, I'd put it on my keyring.
[22:59] <icez> cuz that's a little boring too
[23:00] <sbasuita> icez, 6 cores would have been useful for a huge hash cracking job i had a few months ago...
[23:00] <icez> :P
[23:00] <sbasuita> Meh.... they were weak : D
[23:00] <Laurenceb> hmm the voltages across your camera shutter seem low
[23:00] <jcoxon> sbasuita, now you have a botnet
[23:00] <jcoxon> :-[
[23:00] <sbasuita> >_>
[23:00] <Laurenceb> I would have expected 1.8 or 2.8 or 3.3v
[23:00] <jcoxon> oops
[23:00] <jcoxon> that should be :-p
[23:01] <shellevil> It could be average
[23:01] <shellevil> it's multiplexing
[23:01] <shellevil> for example, and the meter isn't reading it properly
[23:01] <sbasuita> You would have to ask DanielRichman: he took the measurements
[23:02] <shellevil> with a normal multimeter?
[23:02] <DanielRichman> yeah, normal multimeter
[23:02] <DanielRichman> the voltages across the power button were nice and high; 2.8+
[23:02] <shellevil> they basically will not read anything other than DC, or mains frequency AC accurately.
[23:02] <shellevil> (for cheaper DMMs)
[23:03] <shellevil> the camera may be scanning the 'keypad' on the phone rapidly.
[23:09] <Laurenceb> ah 2.8V sounds like a likely Vcc voltage
[23:09] <shellevil> yeah
[23:20] <Laurenceb> jcoxon: the ballast test sounds good
[23:20] <Laurenceb> do you have an avr that can fly on the payload?
[23:20] <Laurenceb> or arduino?
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[23:24] <jcoxon> got an arduino
[23:25] <jcoxon> Laurenceb, i'm going to do a non-ballast flight first
[23:25] <jcoxon> to test the flight computer and the latex floater concept
[23:25] <Laurenceb> right, so one balloon cut away?
[23:25] <jcoxon> no, small vent in the balloon
[23:26] <Laurenceb> I have AVR code to talk the the level sensor
[23:26] <Laurenceb> using the solenoid valve?
[23:26] <jcoxon> Laurenceb, maybe, still working on the idea
[23:38] Action: shellevil ponders. 3l fizzy bottle - say 60g? at 90PSI = 20l. If filled with helium, this is an extra 20g lift?
[23:38] <shellevil> oh well.
[23:38] <shellevil> guess it's easier just to go with ballast.
[23:39] <jcoxon> Laurenceb, what sort of costs do you get with batchpcb?
[23:40] <Laurenceb> ~$3 per square inch or something
[23:40] <Laurenceb> then postage to add on
[23:41] <jcoxon> so say for your radio what did that cost?
[23:41] <jcoxon> (if you don't mind sayIng)
[23:41] <Laurenceb> ~£4 each maybe
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[23:42] <jcoxon> really, wow thats cheap
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[23:44] <Laurenceb> yeah you have to wait a month or so
[23:44] <jcoxon> thats quite a long time
[23:44] <jcoxon> i remember you waiting
[23:44] <jcoxon> right i'm off - night all
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[23:45] <Laurenceb> cya
[23:45] <Laurenceb> I want to move to transceiver ICs now
[23:45] <Laurenceb> sparkfun sell modules based on the chipcon series
[23:50] <Laurenceb> AXSEM also make some good stuff
[00:00] --- Mon Apr 6 2009