highaltitude.log.20110620

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[06:11] <SamSilver> bbl
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[07:20] <griffonbot> Received email: Steve Randall "Re: [UKHAS] Re: Patch antennae? Re: interesting item on ebay?"
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[07:23] <eroomde> morning all
[07:45] <Upu> moring
[07:45] <Upu> morning even
[07:46] <Upu> anyone used the Hwoyee 1600g balloons ?
[07:48] <eroomde> yes
[07:48] <eroomde> once
[07:48] <Upu> what was the burst altitude ?
[07:48] <eroomde> don;t recall
[07:48] <eroomde> 30
[07:48] <eroomde> but that's not a perticularly helpful number in isolation, right?
[07:49] <Upu> no just trying to work out the burst calc for it
[07:49] <Darkside> hmm, would underfilling a 2kg balloon get a higher altitude?
[07:49] <eroomde> probably
[07:49] <Upu> yes but it would be slooooow
[07:49] <Darkside> well, we have a very very light payload now
[07:49] <eroomde> we've done some 2m/s 3kg balloons with light payloads before
[07:49] <Upu> burst @ 36km = 2.3m/s accent rate
[07:49] <eroomde> but they don't always get as high as you think
[07:50] <Darkside> 4 hours...
[07:50] <Darkside> damn
[07:50] <eroomde> i think they can get stuck in high altitude circulations (or even gravity waves, someone supposed) and not have the force to punch through
[07:50] <Darkside> i think we'd launch, then have a bbq
[07:50] <eroomde> the ascent rate drops as it rises too, what with diffusion
[07:50] <Darkside> and not go anywhere until burst, unless we really need to
[07:50] <eroomde> so we had an overnight flight
[07:50] <Darkside> damn
[07:51] <Darkside> we'd like to break our current record (35.354km)
[07:51] <eroomde> they're quite fun
[07:51] <Darkside> that was a 4.5m/s ascent rate
[07:51] <Upu> 1600g just pick the 1500g one ?
[07:52] <eroomde> we've managed to quite easily get into 35kms before but getting to 36+ seems to be a lot harder
[07:52] <eroomde> at least, the tactic of larger balloon and slower ascent doesn't seem to just map nicely onto higher burst altitudes
[07:52] <eroomde> Upu: try both :)
[07:55] <Upu> 4.15m/s accent burst 36287m
[07:55] <eroomde> if you want 36+, you want a much more conservative margin on that, i would say
[07:55] <eroomde> spec it to 38km in the hope of breaking 36
[07:55] <Darkside> mm
[07:56] <Upu> Burst Altitude: 38000 m Time to Burst: 757 min
[07:56] <Upu> Thats based on a 1500g Totex
[07:57] <eroomde> like you say, crack open a few beers
[07:57] <Upu> lol
[07:57] <eroomde> have a bbq
[07:57] <eroomde> text-to-speech on telemetry
[07:57] <Darkside> 12 hours...
[07:57] <eroomde> but again, these low ascent rates are often not what happens in reality
[07:57] <Upu> I think I'll go for 4m/s which should put it around 36km for a 1500g but i'm using a 1600g
[07:58] <eroomde> the balloons just seem to get stuck at some altitude
[07:58] <Upu> does that sound reasonable, I'm not after any records just want to get nice and high and back down again
[07:58] <Upu> 1500g neck lift
[07:58] <eroomde> really?
[07:58] <Upu> 146mins till pop
[07:58] <eroomde> that's a lot
[07:59] <eroomde> how heavy is your payload?
[07:59] <Upu> 850
[07:59] <eroomde> i reckon you could drop down to about 400g free lift
[07:59] <Upu> how do you mean ?
[07:59] <eroomde> and still have enough oomph to get through any atmospheric weirdness
[08:00] <eroomde> so, 850+400g neck lift
[08:01] <Upu> 1 sec hold that thought phone
[08:04] <eroomde> holding
[08:05] <griffonbot> Received email: "Re: [UKHAS] Re: Patch antennae? Re: interesting item on ebay?"
[08:07] <Upu> so 1250g gives an accent rate of 3.25m/s , 189 mins and about 37km
[08:07] <Upu> fine I'll roll with that
[08:08] <eroomde> cool
[08:08] <eroomde> i'll try and track it
[08:08] <eroomde> when are you thinking of launching?
[08:08] <Upu> 27th July
[08:08] <Upu> 10am
[08:08] <Upu> lol
[08:08] <eroomde> i see!
[08:08] <Upu> sorry 24th
[08:09] <Upu> Deershed Festival near Topcliffe
[08:09] <Upu> they have a science theme
[08:09] <Upu> they mailed the list about 3 months ago asking if anyone would like to launch, its only an hour from here so I said yes
[08:10] <russss> ooh science
[08:10] <Upu> yeah
[08:11] <eroomde> i remember
[08:11] <Upu> he's also said I can launch from there when I want
[08:13] <Upu> and the guy from the CAA has provisionally said no issues with it though I've not had my NOTAM yet
[08:13] <Upu> just need decent weather and its go
[08:14] <Upu> might even take the UK record if I'm really lucky
[08:15] <Upu> right cheers eroomde
[08:15] <Upu> I best go do some real work now
[08:16] <eroomde> np, see you
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[09:10] <griffonbot> Received email: Graham GW8RAK "[UKHAS] Re: Hollowing Styrofoam (Polystyrene) blocks."
[09:16] <griffonbot> Received email: John Graham-Cumming "Re: [UKHAS] Re: Hollowing Styrofoam (Polystyrene) blocks."
[09:30] <fsphil> Science fair -- gosh I wish they did stuff like that here
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[10:18] <SpeedEvil> Does anyone happen to have experience on what happens when you ask high 'C' rated lithiums for pulses at their maximum current rating, and 1ms duration, seperated by a few seconds?
[10:18] <SpeedEvil> Wondering about a tiny strobe.
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[10:55] <cuddykid> anyone been sponsored with helium before? £100 is really going to stretch my budget!
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[11:34] <fsphil> I believe a few have, I'm considering it for my next one
[11:35] <eroomde> cuddykid: yes
[11:35] <eroomde> we've always had free helium from BOC for CUSf activities
[11:35] <cuddykid> thanks eroomde, have contacted them in the past with no reply (via email), will try again and hope!
[11:36] <eroomde> we organized it through their embedded university guy
[11:36] <fsphil> handy
[11:36] <eroomde> obvious camb uni gets through vast quantities of industrial gases for all the research activies
[11:36] <cuddykid> ahh, I see
[11:36] <eroomde> a few tanks a months to us is lost in the noise
[11:36] <cuddykid> yeah
[11:37] <cuddykid> tried so many companies however it seems due to the large cost they're not willing to give any discount
[11:38] <fsphil> I got a discount by going through a party balloon place, but they're so far away the discount was used up in transport costs
[11:39] <eroomde> we're not allowed to share our helium just from a liability pov
[11:39] <cuddykid> fsphil: none of the ones near my are responding to emails
[11:40] <cuddykid> might phone them
[11:40] <fsphil> yea i had the same reaction from the locals
[11:40] <eroomde> apparently there have been actual incidents at the university where 3rd parties do things like steal a canister to commit suicide by asphixiation
[11:40] <eroomde> and the owners are liable
[11:40] <cuddykid> yeah, could see big probs there
[11:40] <fsphil> eeu
[11:57] <Upu> cuddy where are you based ?
[11:57] <Upu> I just went to a BoC depot near me
[11:57] <Upu> but yeah its not cheap
[11:57] <Upu> Rjharrison is sponsored I think but he isn't about much lately
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[12:10] <SpeedEvil> If I was doing a personal launch, I'd be using hydrogen
[12:11] <Upu> isn't the general opinion its not worth it ?
[12:11] <SpeedEvil> You do need tot ake some safety precautions - but if you make sure the balloon is empty before filling, the absolute worst case is pretty much that you get a burning balloon thrown at you.
[12:12] <SpeedEvil> Which is unpleasant, but with sensible clothes and a facemask, and a bucket of water, you're fine.
[12:12] <SpeedEvil> And this case is rather unlikely - unless the balloon bursts, or is burst by a flame or lightning.
[12:13] <Upu> It does't give a dramatic amount of lift over Helium
[12:14] <SpeedEvil> No, but it is rather a lot cheaper.
[12:17] <Upu> does get a bad rep, can't think why http://tinyurl.com/yzh46gq
[12:20] <SpeedEvil> I can't find it right now - there is on youtube with a title something like hydrogen weather balloon fire
[12:20] <SpeedEvil> This is a weather balloon inflated to ~1.5m with hydrogen, and then ignited.
[12:20] <SpeedEvil> (by a lit flame)
[12:21] <SpeedEvil> It's basically a 1 second bonfire of the diameter of the balloon - plus bits of burning weather balloon getting thrown around.
[12:21] <SpeedEvil> There is no explosion - it's fairly boring.
[12:23] <SpeedEvil> http://www.youtube.com/watch?v=AJzL_wyMahU - compressed gas safety - though not strictly relevant.
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[12:26] <fsphil> I saw the videos of the hydrogen balloons burning - seems unless they're intentionally mixed with oxygen they're pretty meh
[12:26] <fsphil> I wouldn't want to be transporting it too far though
[12:27] <SpeedEvil> No - but when do you transport a filled balloon.
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[12:28] <Laurenceb> http://video.google.com/videoplay?docid=6506609172175756838&hl=en#
[12:29] <SpeedEvil> What's that?
[12:29] <SpeedEvil> (on 3G at the moment - trying to avoid looking at random stuff)
[12:32] <Laurenceb> H2 balloon ignition tests
[12:32] <SpeedEvil> ah
[12:33] Action: SpeedEvil stabs monkeys that can't read, and shut off the wrong DSL number.
[12:45] <cuddykid> Upu: worcester :)
[12:46] <cuddykid> Upu, were you sponsored?
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[12:54] <Upu> no cuddykid
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[12:54] <Upu> I'm private
[12:58] <cuddykid> cool
[13:00] <Upu> I reckon including the radio (Ft-817) I'm on over £1000 now
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[13:01] <fsphil> the radio is the big one
[13:01] <fsphil> though if you're doing amateury things, it's not that bad
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[13:10] <Upu> I've spent at least £50 on cord :)
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[13:10] <cuddykid> Upu, £50?! on the cord to connect payload to parachute to balloon?
[13:10] <Upu> yeah
[13:11] <Upu> well I got a 50meter reel which doesn't have enough left on it for a flight
[13:11] <cuddykid> I'm over £1000 too, however, I think that most is a one off cost
[13:11] <Upu> so I bought 200meter and it wasn't thick enough
[13:11] <Upu> so I got a thicker 200meter one
[13:11] <Upu> £6.50 on Nichrome
[13:11] <Upu> :)
[13:12] <cuddykid> Upu: :O! I was sponsored for cord but otherwise It would only have been about £10 for 100m (braided nylon cord)
[13:12] <fsphil> I got a 100m reel from rocketboy, can't remember how much now
[13:12] <fsphil> good stuff though
[13:12] <cuddykid> mine was from Timstar lab supplies, looks like it will do the trick nicely
[13:12] <Upu> GPS modules I've used 3
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[13:13] <Upu> Should be £20 a go until the customs got involved
[13:13] <cuddykid> http://www.timstar.co.uk/Physics/Pulleys/BRAIDED-NYLON-CORD-/
[13:13] <fsphil> I'd like to say it's all been worth it, but so far only a 33.3% recovery rate :)
[13:13] <Upu> wrecked on, one is on my protoboard and one is in the live payload
[13:13] <Upu> you need to get that payload back
[13:13] <cuddykid> Oh dear, the customs people always put a damper on the prices
[13:13] <Upu> I want to see pics
[13:14] <fsphil> mee tooo
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[13:14] <Upu> whens your next go at it ?
[13:14] <fsphil> next weekend is a no go, hopefully the one after that
[13:14] <Upu> whats the plan this time ?
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[13:15] <fsphil> small DC motor with one of those dremel disk cutter things on it
[13:15] <fsphil> should be able to cut the cord pretty easily
[13:15] <Upu> you're chopping the tree down ? :)
[13:16] <fsphil> well that's plan B :)
[13:16] <cuddykid> if there's no one around and it seems safe enough then just take a chainsaw lol!
[13:16] <Upu> http://www.amazon.co.uk/Stanley-KNIFE-BLADES-ROOFING-7-11-939/dp/B000X2B5K4
[13:16] <fsphil> well it's in a forest, and I'll pretend not to hear it ...
[13:17] <cuddykid> from google maps it looked very isolated
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[13:18] <fsphil> just a road, fields and a wind farm
[13:18] <Dan-K2VOL> Ugh recovery is such a pain
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[13:29] <fsphil> yea, though it's not many situations that I have to come up with a cutting device on the end of a 10m pole :)
[13:30] <fsphil> just glad it was one of the smaller trees.. most of them where about 15m tall
[13:30] <Dan-K2VOL> No, really I think training monkeys would be easier than some of the recoveries I've been on and heard of!
[13:30] <SpeedEvil> fsphil: Oh - you've got it?
[13:31] <fsphil> nah SpeedEvil, but ready to return. just waiting on getting a lift up
[13:31] <SpeedEvil> ah.
[13:32] <Dan-K2VOL> Fsphil do you have logged data aboard or just want the hardware back for reflight
[13:33] Nick change: ms7821 -> ms7821|makingtea
[13:33] Nick change: ms7821|makingtea -> ms7821|waitingfo
[13:33] <Upu> was it still transmitting fsphil when you went back a week later ?
[13:33] Nick change: ms7821|waitingfo -> ms7821|backnow
[13:33] <fsphil> Dan-K2VOL, just after the pictures from the sd card - and maybe parts for next flight
[13:34] <fsphil> Upu, nope - brought the radio just in case but it was silent
[13:34] <Upu> k
[13:34] <fsphil> I think it probably went for a few days
[13:34] <fsphil> the camera switches off and goes to sleep on the way down
[13:34] <fsphil> and it's the biggest power drain
[13:34] Nick change: ms7821|backnow -> ms7821
[13:36] <fsphil> next time I'll have it sending images until about 10km down -- there was plenty of time for a few more pics
[13:36] <Upu> yeah
[13:38] Nick change: ms7821 -> ms7821|toilet
[13:39] Nick change: ms7821|toilet -> ms7821
[13:40] <Upu> do we really need all these updates ms7821 ?
[13:43] <cuddykid> lol ms7821
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[14:04] <SamSilver> anyone know where this quote comes from " Real Science is not possible without real Duct Tape "
[14:06] <SpeedEvil> Alfred Nobel.
[14:06] <SpeedEvil> Or Tesla.
[14:06] <SpeedEvil> It's usually one of those.
[14:07] <fsphil> Bill Brown?
[14:07] <fsphil> according to the GPSL list anyway :)
[14:08] <SamSilver> fsphil: is orrect
[14:08] <SamSilver> also correct
[14:09] <SamSilver> Bill Brown
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[14:23] <fsphil> woo, do I get points?
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[14:28] <W0OTM> Hello all
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[14:40] <fsphil> evening W0OTM
[14:41] <W0OTM> anything new in the hab world?
[14:41] <SpeedEvil> Doesn't seem much.
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[14:42] <fsphil> not this week anyway - few launches in the uk next week I think
[14:42] <SpeedEvil> And maybe a recovery! :)
[14:43] <fsphil> ooh that too
[14:45] <WillDuckworth> hopefully got something ready for either of the last 2 weekends in july
[14:46] <cuddykid> W0OTM: saw a post of yours on rcgroups about the glider, I've been having a think recently and hope to work on an autonomous glider over the summer (doubt I'll get far though).. have you made any progress?
[14:48] <W0OTM> cuddykid: yes
[14:48] <W0OTM> cuddykid: we are doing flight tests now, and plan a 30K drop in the fall
[14:48] <cuddykid> nice!
[14:49] <cuddykid> are you custom making autopilot or using ardupilot or the likes?
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[14:49] <W0OTM> cuddykid: ill provide details as we get closer to our "public" launch
[14:49] <cuddykid> cheers, can't wait to see!
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[15:01] <jiffe> do they make GPSes that can route over rivers? I'm going tubing in a month along a 15 mile route and it'd be cool to have a gps to keep track of where we are and how far we have to go
[15:02] <cuddykid> jiffe, any gps should just track your co-ordinates so it doesn't matter what terrain, then you should be able to view route etc if it logs it
[15:02] <cuddykid> however, you'll want to keep it waterproof I'm guessing! sounds a lot of fun
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[15:20] <SpeedEvil> You need also to turn off 'snap to road' on some.
[15:20] <SpeedEvil> But that should auto-turn off when you're a few dozen meters off.
[15:23] <Upu> jiffe just get an iphone with Runtracker on it
[15:23] <Upu> and keep it dry
[15:24] Action: SpeedEvil recommends an n900 with osm2go on it - then you can update the map as you go.
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[16:44] <griffonbot> Received email: Steve Randall "Re: [UKHAS] Re: Patch antennae? Re: interesting item on ebay?"
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[17:12] <cuddykid> oh wow.. just been on the google group mailing list and the chairman of the Worcester Radio Amateurs Association has tried to get in touch with me! Didn't realise there was a HAM radio club nearby!
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[17:14] <SamSilver> bbl
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[17:23] <fsphil> hams r everywhere
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[17:50] Nick change: MoALTz_ -> MoALTz
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[18:09] <Lunar_Lander> hello
[18:09] <Lunar_Lander> hi fsphil RocketBoy
[18:15] <griffonbot> Received email: Adam Cudworth "[UKHAS] Re: HABE Launch"
[18:15] <cuddykid> hi Lunar_Lander
[18:16] <cuddykid> raining again here, was lovely this morning then clouded over
[18:16] <Lunar_Lander> hi cuddykid
[18:16] <Lunar_Lander> how's life and your project status?
[18:18] <cuddykid> alright thanks, project is all systems go and awaiting CAA clearance!
[18:18] <cuddykid> hopefully another week and a bit then it'll be up in the air
[18:19] <Lunar_Lander> that is cool! :)
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[18:21] nelly11 (8afab1d8@gateway/web/freenode/ip.138.250.177.216) joined #highaltitude.
[18:22] <nelly11> hey! anyone here used the CHDK? Just wondering how to write scripts on a memory card. Do I just save the code lines on a notepad and load onto the sd card?
[18:22] <Lunar_Lander> hello hibby nelly11
[18:22] <nelly11> helloo!!!
[18:22] <eroomde> correct!
[18:22] <nelly11> thanks :)
[18:22] <nelly11> how have you been Lunar_Lander?
[18:24] <Lunar_Lander> I'm fine thanks nelly11 and you?
[18:24] <nelly11> Fine too
[18:25] <Lunar_Lander> and how's your progress?
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[18:26] <nelly11> much better now....I've finished building my test payload and have received pretty much all the items I ordered
[18:26] <nelly11> we are hoping to get our first launch in mid july
[18:26] <nelly11> how about you?
[18:27] <Lunar_Lander> I'm still lacking a GPS
[18:27] <Lunar_Lander> but when I have one, I can hook that and the NTX2 to the Arduino UNi
[18:27] <Lunar_Lander> *Uno
[18:27] <Lunar_Lander> and then I have a working tracker system!
[18:28] <nelly11> sounds good
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[18:30] <Lunar_Lander> yeah
[18:30] <Lunar_Lander> btw, do you know 30 Seconds to Mars?
[18:30] <Lunar_Lander> they have a nice motto
[18:31] <Lunar_Lander> Provehito in Altum
[18:32] <Lunar_Lander> which is "Walk towards higher grounds"
[18:38] <nelly11> I didnt know that
[18:39] <RocketBoy> tee he - antenna advertised as omni-directional with "7.9dBi" of gain and a VSWR of 2.33 dBi - what a bunch of Ws http://shop.lprs.co.uk/datasheets/ANT-433MR%20MS.pdf
[18:40] <Lunar_Lander> nelly11 but it is matching :)
[18:42] <russss> heh
[18:43] <Lunar_Lander> what is "Ws"?
[18:48] <RocketBoy> the plural of a not nice word starting with W
[18:49] <cuddykid> lol
[18:49] <Lunar_Lander> oh ok
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[19:28] <Lunar_Lander> hi mixio and SamSilver
[19:28] <Lunar_Lander> and earthshine
[19:29] <SamSilver> Evening Lunar
[19:31] <Lunar_Lander> how are you?
[19:32] <SamSilver> I am good
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[19:33] <SamSilver> busy drawing up some RF design
[19:33] <SamSilver> Lunar_Lander: what you up too?
[19:34] <Lunar_Lander> thinking about a geometrical optics problem
[19:35] <SamSilver> oh looking under toilet doors???
[19:35] <SamSilver> lol
[19:35] <SamSilver> no realy what is the prob?
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[19:35] <Lunar_Lander> deriving Snell'
[19:36] <Lunar_Lander> *Snell's law from Fermat's principle
[19:36] <SamSilver> OK you lost me right there mate.
[19:36] <Lunar_Lander> well
[19:37] <Lunar_Lander> light bends when it enters glass or water
[19:37] <Lunar_Lander> and Fermat says that light takes the path which takes the least time
[19:37] <SamSilver> yip
[19:37] <Lunar_Lander> and from there you can get to the law for light bending
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[19:39] <BrainDamage> it's been quite a while since I did that, aren't you supposed to set up gauss law at the material interface? like cylinder wich size -> 0, and you say that normal E field and ortogonal B are conserved?
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[19:39] <Lunar_Lander> ah
[19:39] <SamSilver> http://en.wikipedia.org/wiki/Snell's_law
[19:39] <Lunar_Lander> no not that complicated
[19:40] <Lunar_Lander> it's just that you have two orthogonal triangles
[19:40] <Lunar_Lander> and that you can express the light path with the angles
[19:40] <Lunar_Lander> and then you can find that Snell's law gives the path of the shortest time
[19:41] <SamSilver> I like this http://en.wikipedia.org/wiki/File:Snells_law_wavefronts.gif
[19:41] <Lunar_Lander> but technically you are right BrainDamage
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[19:42] <BrainDamage> ah, according to wikipedia, there's several ways to reach it, I had 2 of them
[19:42] <Lunar_Lander> yeah
[19:42] <Lunar_Lander> we were supposed to think of it that you can draw one triangle in the "air" and one in the optical medium
[19:42] <BrainDamage> didn't have the one from fermat principle, sorry
[19:42] <Lunar_Lander> and then you have the sides and the angles
[19:43] <Lunar_Lander> and with pythagoras you find the lenghths and so on
[19:43] <Lunar_Lander> ah ok
[19:43] <Lunar_Lander> well no problem
[19:43] <Lunar_Lander> I think I have solved the task anyway
[19:43] <Lunar_Lander> :P
[19:43] <SamSilver> qed then
[19:43] <Lunar_Lander> what I need to think about however is that other task
[19:44] <Lunar_Lander> there is a prism with a refracting angle of 90°
[19:44] <SamSilver> Lunar_Lander: you up helping me with my RF design prob
[19:44] <Lunar_Lander> I don't have much experience in that, sorry
[19:44] <Lunar_Lander> what is the problem?
[19:45] <SamSilver> where to put the keying signal for morse in my design
[19:45] <Lunar_Lander> oh ok
[19:45] <Lunar_Lander> sorry I don't think I can help you
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[19:46] <SamSilver> I think the solution is to build it then ph optionslay wit
[19:46] <SamSilver> play with options *
[19:47] <Lunar_Lander> I agree
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[19:57] <Lunar_Lander> wb mixio
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[20:06] <SamSilver> g'night Lunar_Lander
[20:06] <Lunar_Lander> gn8 SamSilver
[20:06] <Lunar_Lander> hello jcoxon
[20:07] <SamSilver> will be back in 8 or 9 hours time
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[20:08] <jcoxon> evening
[20:08] <Upu> evening jcoxon
[20:08] <Lunar_Lander> how are you?
[20:08] <Lunar_Lander> hi Upu
[20:08] <Upu> hey lunar
[20:09] <jcoxon> good thanks
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[20:09] <Upu> so did I hear we have some launches this weekend ?
[20:11] <jcoxon> there was a US launch
[20:11] <jcoxon> though it didn't get that much of a track on spacenear.us
[20:11] <Upu> don't think it actually launched
[20:12] <jcoxon> oh it did
[20:12] <Upu> oh ok
[20:12] <jcoxon> just a day late
[20:12] <Upu> lol
[20:12] <jcoxon> well at least there is a track on the ma
[20:12] <Upu> thats why I missed it
[20:12] <jcoxon> p
[20:12] <Upu> oh yeah
[20:13] <Lunar_Lander> who launched it?
[20:13] <Upu> any chance you could PM me the password so I can test my iphone chase car tracker works with spacenear.us ?
[20:14] <Upu> cheers
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[20:17] <Upu> bingo that works
[20:17] <Upu> thanks jcoxon
[20:19] <Upu> got my neck lift calcs sorted
[20:19] <Upu> notam on its way fingers cross so just need the weather to be ok now
[20:19] <jcoxon> :-)
[20:19] <jcoxon> thats the hard part
[20:19] <Upu> yeah
[20:20] <Upu> well if its crap the guy said I can use his land to launch whenever
[20:20] <Upu> which is nice as it's only an hour from here
[20:20] <Lunar_Lander> Upu when do you plan to launch?
[20:20] <Upu> July the 24th
[20:20] <Upu> Sunday
[20:21] <Upu> At the Deershed festival, they have a science theme and mailed the list a few months ago asking if anyone would be willing to do a launch
[20:21] <Upu> I have my own field which is nice :)
[20:22] <Lunar_Lander> cool
[20:22] <jcoxon> http://www.southgatearc.org/news/june2011/arissat1_sstv.htm
[20:22] <Lunar_Lander> what will your balloon do?
[20:22] <jcoxon> thats going to be very cool
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[20:22] <Upu> go up and down hopefully , nothing ground breaking
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[20:23] <Upu> hmm looks interesting jcoxon
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[20:23] <jcoxon> sstv images from space!
[20:23] Action: Upu fires up wxtrack
[20:24] <Dan-K2VOL1> Hi all
[20:24] <jcoxon> evening Dan-K2VOL1
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[20:24] <Lunar_Lander> hello Dan-K2VOL1
[20:25] <Lunar_Lander> thanks jcoxon
[20:25] <Dan-K2VOL1> Buenas noches
[20:25] <Upu> is ARRISat up there already ?
[20:25] <Dan-K2VOL1> Just wanted to let you all know that we've started re-working the ORBCOMM sat modem code, and are uploading it to google code. The white star team is back on the job
[20:27] <Lunar_Lander> cool
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[20:28] <Upu> ah ok so Arrisat is up there just inside ISS at the moment
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[20:29] <jcoxon> Dan-K2VOL1, your nemesis
[20:29] Nick change: MoALTz_ -> MoALTz
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[20:38] <Lunar_Lander> jcoxon how are your projects going?
[20:39] <Dan-K2VOL1> Haha what jcoxon?
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[20:42] <fsphil> I've received some SSTV from the ISS before -- though they're not proper live images like arissat will be
[20:42] <Upu> can't wait for that
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[20:44] <Lunar_Lander> jcoxon how are your projects going?
[20:48] <jcoxon> Dan-K2VOL1, that orbcomm code
[20:48] <jcoxon> Lunar_Lander, slow progress really
[20:48] <Upu> whats Orbcom ?
[20:48] <Lunar_Lander> oh, how comes?
[20:48] <Lunar_Lander> Upu communications satellite network
[20:48] <jcoxon> Lunar_Lander, just life getting in the way really
[20:48] <Upu> that sounds interesting
[20:49] <Upu> URL ?
[20:49] <Lunar_Lander> jcoxon ah ok
[20:49] <Lunar_Lander> same here
[20:50] <Lunar_Lander> jcoxon you heard of the launch in Southern Germany?
[20:50] <Lunar_Lander> on the Ham Radio fair?
[20:50] <jcoxon> Lunar_Lander, yeah
[20:50] <Lunar_Lander> seems like I can't attend :(
[20:50] <jcoxon> oh thats a shame
[20:50] <jcoxon> it would have been good
[20:50] <jcoxon> that ham fair is very big
[20:50] <Lunar_Lander> the ham with whom I have been there last year won't go there this year
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[20:51] <Lunar_Lander> and the engineering school of Münster already goes on Wednesday noob
[20:51] <Lunar_Lander> *noon
[20:51] <Lunar_Lander> sorry
[20:51] <Lunar_Lander> and the HAMCAMP won't open until 4 pm on Thursday
[20:52] <Lunar_Lander> so I don't know where to stay from Wednesday to Thursday
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[20:58] <Dan-K2VOL1> Lol gotcha jcoxon
[20:58] <Lunar_Lander> Upu http://www.orbcomm.com/
[20:59] <Upu> thx
[20:59] <Upu> oh its a company I see
[20:59] <Dan-K2VOL1> upu check wiki.whitestarballoon.org for how we're using it
[20:59] <Dan-K2VOL1> With the Digi m10 modem
[21:00] <Upu> checking it
[21:01] <Upu> haha
[21:02] <Dan-K2VOL1> have to leave work now upu, will be back on in an hour or two if you want to chat more about that
[21:02] <Upu> that would be the modem that says "FCC prohibits the use of this device on an aircraft2 ?
[21:02] <Dan-K2VOL1> Shhh!
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[21:02] <Upu> haha
[21:02] <Lunar_Lander> rofl
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[21:02] <Dan-K2VOL1> We are not an aircraft, by the definition of the FAA
[21:02] <Upu> I'll be in bed but I'll have a read of that
[21:02] <Dan-K2VOL1> Hehe
[21:02] <Upu> fair enough :)
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[21:10] Action: jcoxon has a tidy desk
[21:11] <jcoxon> first time in about 2 months
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[21:14] <Lunar_Lander> jcoxon I cleaned mine up on Saturday
[21:14] <Lunar_Lander> it is a good feeling to finally have workspace again
[21:15] <jcoxon> yeah
[21:18] <Lunar_Lander> :)
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[22:30] <Laurenceb_> muhaha - ekf runs at 125Hz
[22:31] <Laurenceb_> turns out openpilots lame nmea parser splits gps updates between multiple kalman iterations - so less work in a single step
[22:32] <SpeedEvil> Been playing with fags, or optimising code?
[22:32] <SpeedEvil> flags
[22:32] <SpeedEvil> What's special about 125?
[22:33] <SpeedEvil> you mean instead of it updating atomically, it updates lat, runs the filter, updates long, ...?
[22:34] <Laurenceb_> thats how openpilot runs
[22:34] <Laurenceb_> as an unintended consequence of the lame parser code
[22:34] <Laurenceb_> ive allowed the timing to jitter +-2ms to fit in the longer update steps
[22:35] <Laurenceb_> openpilot manage 150hz, but they dont use polled i2c
[22:35] <Laurenceb_> its in a seperate task with context switching linked to hardware ready isrs
[22:36] <Laurenceb_> that gives them a small benefit at the expense of a lot of ram
[22:36] <SpeedEvil> eww
[22:36] <Laurenceb_> i might be able to get to 150hz by making timing looser
[22:36] <SpeedEvil> Sounds awesome.
[22:36] <SpeedEvil> :)
[22:37] <Laurenceb_> but im going to get to the point where the main task only has a few windows of free time to run
[22:37] <SpeedEvil> Have you done any long term analysis - see how stationary it stays?
[22:37] <Laurenceb_> nope
[22:37] <Laurenceb_> really bad gps in my house atm
[22:37] <Laurenceb_> +-50m drift and only 4 sats - its very wet out there
[22:37] <SpeedEvil> yeah - don't want it to take too much CPU, or you run into conditions where the filter takes 10% more time than it should due to wierdness.
[22:38] <Laurenceb_> interestingly the drift upsets the attitude slightly
[22:38] <Laurenceb_> due to the linkage between velocity and attitude introduced by the filter
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[22:38] <Laurenceb_> at a rough guess the ekf is getting between 1 and 2 orders of mag less drift
[22:39] <Laurenceb_> meter or so from the imu
[22:39] <Laurenceb_> max 100m from the gps atm
[22:39] <Laurenceb_> - ground floor of house with wet roof
[22:39] <SpeedEvil> I did one of the dealextreme GPS thingies
[22:39] <SpeedEvil> the antennas.
[22:40] <SpeedEvil> On a long bit of satellite cable
[22:40] <Laurenceb_> anyway im off, cya
[22:40] <SpeedEvil> wave
[22:40] <Laurenceb_> sorry - ttyl
[22:40] <SpeedEvil> handy for indoor testing. :)
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[23:03] <NigeyS> meep
[23:03] <SpeedEvil> d33w
[23:04] <NigeyS> hey speedy
[23:06] <SpeedEvil> :)
[23:35] <NigeyS> dam domains arent as cheap as they used to be, £12 for a .net .. pffffff
[23:36] Action: SpeedEvil has a 4 letter .com
[23:36] <NigeyS> :p
[23:37] <SpeedEvil> Selected by the simple expedient of setting snipes for $10 on all 4 letter domains coming up on ebay.
[23:37] <NigeyS> lol nicey
[23:38] <SpeedEvil> qkwv
[23:40] <NigeyS> http://www.gamerserv.net/
[23:40] <NigeyS> that work for ya ?
[23:41] <SpeedEvil> default page
[23:42] <NigeyS> gdgd, that was pretty quick, only reged 10mins ago
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[00:00] --- Tue Jun 21 2011