highaltitude.log.20130506

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[02:32] <heathkid> how cold should the payload be able to still function?
[02:32] <heathkid> the HX1 puts out enough heat I'm not too worried...
[02:32] <heathkid> but I can test in our lab down to -55C
[02:33] <heathkid> and up to 125k ft.
[02:33] <heathkid> though not at the same time... :(
[02:35] <heathkid> the tracker I'm using is small enough I could probably fit it one of our SEMs to pull a *serious* vacuum... but probably not needed.
[02:36] <heathkid> ...and no way of making sure it's working during the test if I did so
[02:36] <heathkid> the SEMs are pretty well shielded
[02:36] <heathkid> :)
[02:38] <heathkid> or I could put it in our HALT chamber... but that pretty much is designed to kill anything
[02:38] <heathkid> Highly Accelerated Life Testing
[02:38] <heathkid> temp (cold/hot) + 3 dimensional G forces
[02:39] <heathkid> or I order some plain mylars and just do a launch...
[02:39] <heathkid> suggestions?
[02:39] <heathkid> and do mylars burst?
[02:40] <heathkid> this is incredible! http://vimeo.com/60129284
[02:40] <heathkid> but what about mylar?
[02:40] <heathkid> or do mylars just level off and float?
[02:40] <heathkid> nigelvh: ???
[02:44] <heathkid> nigelvh: please PM me if you have any thoughts or info... you know I have to do a launch this week... so I can be prepared for Dayton.
[02:44] <heathkid> thanks
[02:44] <heathkid> nite
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[06:10] <x-f> good whatabeautiful morning, everyone!
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[07:03] <arko> morning x-f
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[08:47] <Upu> yes and yes
[08:48] <Upu> heathkid if you're still about
[08:48] <Upu> yes they burst
[08:48] <Upu> yes they float
[08:48] <Upu> sometimes
[08:48] <Upu> depends on gas volume
[08:53] <jcoxon> out of context that makes very little sense
[08:53] <costyn> haha
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[09:10] <Upu> lol yes
[09:11] <Upu> shame i don't have a pico ready its a perfect day for one
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[09:12] <Upu> well apart from prediction : http://ready.arl.noaa.gov/hysplitout/18673_trj001.gif
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[09:23] <jcoxon> Upu, we could track that
[09:23] <jcoxon> :-)
[09:24] <Upu> only if M0DTS is awake :)
[09:24] <Upu> looks like a perfect channel just out of range of all the stations @ 4km altitude :)
[09:26] <jcoxon> hehe
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[09:26] <Upu> where did Kraken turn up anyway ?
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[09:27] <Upu> wrong channel
[09:29] <jcoxon> Upu, did some research on 13.553Mhz beacons
[09:29] <jcoxon> seems that its quite a common thing in the states
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[09:29] <Upu> could we make it do WSPR ?
[09:29] <jcoxon> of unlicenced (but legal) transmitters
[09:29] <Upu> and can we convey any useful information with it ?
[09:30] <Upu> ok
[09:30] <jcoxon> thats the issue with wspr
[09:30] <jcoxon> its genius is the set data
[09:30] <jcoxon> so you could do 6fig location code
[09:30] <jcoxon> but its not particularly useful
[09:31] <jcoxon> i think we do CW and RTTY on 13.553
[09:31] <jcoxon> and rely on dl-fldigi network
[09:31] <Upu> fair enough
[09:31] <Upu> worth a go
[09:31] <craag> What power can you use on 13.553?
[09:32] <jcoxon> approximately 10mW
[09:32] <craag> I've just built a DDS RTTY beacon on 27MHz, will be at 10mw
[09:32] <craag> ok
[09:32] <jcoxon> craag, going for licence exempt?
[09:32] <craag> Yeah
[09:32] <craag> What's 13.553 designated as?
[09:32] <jcoxon> its the same
[09:33] <craag> oh ok
[09:33] <jcoxon> if you look on IR_2030
[09:33] <craag> ah
[09:33] <jcoxon> i was worried it might interfere with 13.56 RFID
[09:33] <jcoxon> but i don't think it will
[09:33] <jcoxon> especially if i stick to .553Mhz
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[09:34] <mfa298> I guess WSPR is only of real use if we can do it on a standard frequency to make use of any existing network. if we're doing it on another frequency then using what we already know and use could be as good.
[09:34] <craag> Yeah shouldn't be an issue, potential qrm for rx if theres an rfid pad around.
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[09:36] <jcoxon> well i'll hopefully have it in the air relatively soon
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[09:37] <craag> mfa298: Yep. I'd like to push slow-HaTTY for HF. It'd be quite similar in decoding and robustness as WSPR, but with whatever format and buadrate we want.
[09:37] <craag> But... we need to write a decoder for it..
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[09:39] <craag> bbl
[09:39] <jcoxon> i think teh CW decoder has improved in fldigi now
[09:40] <mfa298> how frequency agile are the TX modules you've been looking at. WSPR could be useful for the floaters if it could change to a WSPR frequency when it's over suitable countries (or international waters)
[09:41] <NickB1> hi
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[09:41] <NickB1> can someone approbe a flight doc?
[09:41] <NickB1> f4b339bd49377db6e05598b6f76049bb
[09:43] <jcoxon> mfa298, very flexible
[09:43] <jcoxon> my si570 setup can do 10Mhz-950Mhz
[09:43] <jcoxon> in theory
[09:44] <mfa298> that's quite a range.
[09:46] <jcoxon> but you obvious can't do that because of antennas etc
[09:46] <jcoxon> considering such a small power output
[09:49] <mfa298> I was expecting the external components would limit you to parts of the range. An antenna for 13.5 might still work well for 14.0-14.1 for the 20m digial modes though.
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[09:51] <costyn> NickB1: maybe easier to ask on #habhub. all the guys that can approve hang out there and it's a lot less busy
[09:52] <jcoxon> NickB1, most likely they are in exams :-) tis that time of year
[09:53] <jcoxon> mfa298, oh yeah, a carefully chosen Low Pass Filter would allow for that
[09:54] <mfa298> I'd hope they're not in exams today (as it's a bank holiday) but revision/sleeping is likely.
[09:54] <mfa298> although I'm not sure I can believe it's a bank holiday, the sun appears to be shining.
[09:55] <jcoxon> cambridge do exams on bank holidays
[09:55] <jcoxon> unfortunately
[09:58] <NickB1> ah ok
[09:58] <NickB1> will try again this evening :)
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[10:25] Action: mfa298 find's important lesson #1 of using a multimeter to test resistors: check what the MM says when you short it's probes.
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[10:35] <costyn> mfa298: what did itsay? not 0?
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[10:41] <mfa298> there was around 5 ohms resistance, which looks to be from the protection fuse (so I'm not surprised)
[10:43] <mfa298> I think I've pretty much always tested MM's like that when checking resistors / continuity but I think that's the first time it's proved it's use
[10:44] <mfa298> I've tended to only use this one for continuity or quick voltage tests when out and about (it've nice and portable)
[10:44] <cm13g09> mfa298: AH
[10:44] <cm13g09> that sounds like interesting fun
[10:46] <mfa298> i was checking some old 50R BNC terminiators (from the 10Base2 days for those old enough) to see if they were really 50R
[10:46] <mfa298> I was half hoping one might be 75R for the end of a composite video feed.
[10:47] <mfa298> I've also found that having gone and bought a rg58 bnc plug as I didn't think I had any, I already had three in various boxes.
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[10:55] <cm13g09> mfa298: lol
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[11:45] <cuddykid> idiots at royal mail - £8 "handling fee" for a £5 customs charge..
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[11:47] <zyp> cuddykid, that's cheap compared to norway
[11:48] <cuddykid> ouch
[11:50] <mfa298> next you'll be telling us the actual item was only worth £4
[11:52] <cuddykid> £20
[11:52] <cuddykid> yep
[11:52] <cuddykid> unbelievable - thieving government!
[11:52] <cuddykid> never had a delivery from china/HK get held up before - this one was from US
[11:53] <Daviey> next, cuddykid will be telling us he paid the £8 charge - making royal mail richer "idiots", and you poorer - but smart.
[12:00] <mfa298> unfortunately I'm not sure there's much choice in the matter unless you decide not to take the delivery
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[12:22] <cuddykid> has anyone used a more parafoil shaped chute before and if so, where to buy from?
[12:39] <kokey> consider yourself lucky
[12:39] <kokey> getting stuff from overseas in South Africa is a royal PITA
[12:39] <kokey> customs will sit on it for weeks to months
[12:40] <kokey> and then classify it weirdly and charge some random amount
[12:40] <kokey> that's assuming they don't steal it
[12:41] <cuddykid> lol
[12:41] <cuddykid> just awful
[12:42] <cuddykid> send it over by balloon ;)
[12:43] <kokey> at the moment I just order stuff to the UK and pick it up when we go visit
[12:43] <kokey> making me wonder what kind of scene takes place when Darkside goes through a customs search
[12:45] <Darkside> wat
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[13:06] <kokey> Darkside: well, I'm assuming you carry at least some parts and gear with you when you travel
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[13:25] <Darkside> kokey: yes
[13:25] <Darkside> i havent ever had trouble at customs because of it
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[15:24] <cuddykid> fsphil: is the logitec C270 webcam susceptible to the cold temps? Plan on having it away from raspberry pi in it's own little styrofoam box so probably not that warm
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[15:41] <SpeedEvil> most webcams are fairly high power
[15:48] Action: Laurenceb_ is reading http://www.quantumg.net/mockingbird.pdf
[15:49] <eroomde> very interesting Laurenceb_
[15:49] <Laurenceb_> im currently doing the numbers on same design with lipo/brushless pump system
[15:49] <eroomde> i think i have read this before actually
[15:50] <eroomde> i remember thinking their mass fraction was a bit woowoo
[15:50] <Laurenceb_> i dont understand how the tank pressurization works
[15:50] <eroomde> 75kg empty, 1500kg wet
[15:50] <Laurenceb_> heh yeah
[15:50] <Laurenceb_> looks like liquid helium?
[15:50] <Laurenceb_> in which case "cryogenic free" isn't true
[15:51] <eroomde> it's not a million miles from Xaero
[15:51] <Laurenceb_> i get ~26Kg for lipo/brushless pumps
[15:52] <Laurenceb_> needs about 40Kw power
[15:52] <eroomde> http://masten-space.com/2013/03/18/xaero-b-rises/
[15:52] <eroomde> i was very impressed with this
[15:53] <Laurenceb_> http://www.hobbyking.com/hobbyking/store/__14426__Turnigy_CA80_80_Brushless_Outrunner_50_80cc_Eq_.html
[15:53] <Laurenceb_> one of those per engine
[15:53] <Laurenceb_> interesting
[15:54] <eroomde> it's not a crazy-foo mass fractiond design, it's designed to be a work horse that's easy to work on
[15:54] <eroomde> but it's very impressive
[15:54] <Laurenceb_> is that using piston pumps?
[15:54] <Laurenceb_> the xaero?
[15:54] <eroomde> pressure fed
[15:54] <Laurenceb_> ah
[15:54] <eroomde> xcor are the piston pump people
[15:55] <Laurenceb_> ok
[15:55] <Laurenceb_> when i do the numbers, lipo + brushless motor turbopump isnt unreasonable
[15:55] <eroomde> no indeed
[15:55] <Laurenceb_> which seems rather insane...
[15:55] <eroomde> same
[15:55] <Laurenceb_> :D
[15:56] <eroomde> we have actually gone down the road of speccing a 3-d printable pump with lipos and a meaty outrunner
[15:56] <eroomde> no time/money for it atm (not at the wscale to need pumps yet) but it would be a cool experiment
[15:56] <Laurenceb_> yeah
[15:57] <eroomde> i think though that mastering turbopumps would be a noble goal
[15:57] <eroomde> it doesn;t seem to be so much that they're hard, because they're simple
[15:57] <Laurenceb_> yeah i dont see how to do the seals properly atm
[15:57] <eroomde> it's more than the anaylysis to make a good one can be a bit daunting
[15:57] <Laurenceb_> the impellor design looks doable
[15:58] <eroomde> but vs almost any other pump, they're really simple
[15:58] <Laurenceb_> is it possible to make a turnbopump with input fluid pressure across the shaft seal?
[15:58] <qyx_> Laurenceb_: O_O
[15:58] <Laurenceb_> rather than output fluid pressure
[15:58] <qyx_> 200A & 50V?
[15:58] <Laurenceb_> yup
[15:59] <Laurenceb_> that "mockingbird" thing is about 5Kw/engine
[15:59] <eroomde> i'm not sure how the lipos could deliver that
[15:59] <Laurenceb_> so you dont need quite that much power
[15:59] <qyx_> those engines have only 5kW?
[15:59] <Laurenceb_> http://www.hobbyking.com/hobbyking/store/__18594__Turnigy_5800mAh_1S_25C_Lipoly_Single_Cell_.html
[15:59] <eroomde> or rather, i'm not sure if the '200C!!!11!!1!!111one' LiPos can actually hold 200C for 30s at rated voltage or whatever
[15:59] <Laurenceb_> qyx_ of input pumping power
[15:59] <qyx_> eroomde: easily, they are specified at 30C+
[16:00] <eroomde> huh?
[16:00] <eroomde> i'm saying 200C
[16:00] <SpeedEvil> Laurenceb: do several little ones. RAIP!!!
[16:00] <qyx_> minimally :)
[16:00] <Laurenceb_> wtf
[16:00] <Laurenceb_> 200C for 30s would be flat
[16:00] <Laurenceb_> lol
[16:00] <eroomde> yes i know
[16:00] <eroomde> 60/200 seconds then
[16:00] <Laurenceb_> ok
[16:00] <eroomde> er, 3600/200
[16:00] <Laurenceb_> SpeedEvil: yeah
[16:01] <Laurenceb_> lipo/brushless makes modular launchers very attractive
[16:01] <eroomde> i think they'd be worth considering to ignite engines too
[16:01] <SpeedEvil> :)
[16:01] <eroomde> i.e. a turbopumo with a coil in the stator
[16:01] <eroomde> to get it up to ignition
[16:02] <Laurenceb_> hmm
[16:02] <SpeedEvil> oh. I thought you meant short the cell and throw in the engine.
[16:02] <Laurenceb_> you could test this with a "fruitcake pressure washer"
[16:02] <Laurenceb_> just feed with mains water
[16:02] <Laurenceb_> then use car batteries as power
[16:03] <SpeedEvil> pressure washing fruitcake makes it moist.
[16:03] <Laurenceb_> or lorry batteries...
[16:03] <eroomde> hawker drycell
[16:04] <eroomde> the preffered choice of the pre-nicad generation of robot wars
[16:04] <eroomde> and hawker odyssey
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[16:09] <Laurenceb_> http://www.theregister.co.uk/2013/05/06/hiker_hacker_maker_charger/
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[16:24] <arko> morning
[16:26] Nick change: keithp` -> keithp
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[16:51] <x-f> morning, arko
[16:51] <arko> yo
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[17:20] <Lunar_Lander> hello
[17:21] <Lunar_Lander> hope you all have a sunny day :)
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[17:24] <arko> its raining here
[17:24] <arko> for the first time in many weeks
[17:24] <Lunar_Lander> oh ok
[17:24] <arko> its awesome!
[17:24] <Lunar_Lander> :)
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[17:50] <mfa298> sounds like arko's weather is doing the opposite of the UK (lots of sun today!)
[17:53] <arko> awesome! can we keep each others weather for a while?
[17:53] <arko> im liking this
[17:53] <arko> but not too long, sunlight is nice
[17:53] <mfa298> I doubt much of the UK would complain. We're sick of the rain.
[17:54] <arko> no wonder things are so green there
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[18:25] <griffonbot> @NSEballoon: @EssexHam: High Altitude Balloon Tracking http://t.co/RCGmDAFmsz #UKHAS [http://twitter.com/NSEballoon/status/331474838046793731]
[18:26] <chrisstubbs> Nice little video from M0PSX's tracking experience this weekend
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[18:30] <Upu> good video
[18:31] <arko> good voice too
[18:32] <arko> Upu: need any more info from me about UKHAS trip?
[18:32] <Upu> hey arko
[18:32] <Upu> no don't think so
[18:32] <arko> coolio
[18:32] <Upu> what were your free dates again ?
[18:33] <eroomde> i'm not a free date but i'm quite cheap
[18:33] <arko> August 31st - Sept 9
[18:33] <Upu> k ta
[18:33] <arko> haha
[18:34] <arko> i still need to coordinate with eroomde
[18:34] <arko> and maybe some nice folks in cambridge for a warm room to sleep in
[18:34] <Upu> you fly in on the 31st ?
[18:34] <arko> 30-31 is the target at the moment
[18:34] <arko> haven't booked yet
[18:34] <Upu> ok
[18:35] <eroomde> i'm around them
[18:35] <arko> waiting on passport to clear
[18:35] <eroomde> keeping it free
[18:35] <arko> wicked
[18:35] <arko> i told all my friends im not going to DEFCON this year
[18:35] <arko> first time in many years
[18:36] <arko> they mad, but i'm happy to travel
[18:36] <eroomde> you won;t be talking there this you
[18:36] <eroomde> for you, it's MUTECON
[18:36] <eroomde> this year*
[18:36] <arko> haha
[18:36] <arko> BLINDCON next year
[18:36] <jcoxon> Upu, guess its time for us to organsie the conference then
[18:37] <arko> are hotels in cambridge cheap?
[18:37] <arko> ish..?
[18:37] <Upu> yup afraid we can procrastinate no more
[18:37] <Upu> we have this thing called "Travellodge" arko
[18:37] <Upu> like dry caves
[18:37] <arko> Ye Travellodge
[18:38] <arko> upon cambridge
[18:38] <jcoxon> or youth hostel
[18:38] <arko> something something british speak
[18:38] <jcoxon> or rooms in the colleges
[18:38] <arko> neat
[18:38] <Upu> Holiday Inn's are cheap but not bad
[18:39] <arko> im going to try the homeless math professor look and see if i can score some place to sleep in the halls of cambridge
[18:39] <arko> cool
[18:39] <arko> yeah i need to start thinking about this very soon
[18:39] <eroomde> you should forget your own name
[18:39] <arko> lol
[18:40] <Upu> Arko its likely to be a Saturday
[18:40] <Upu> which is best for you ?
[18:41] <arko> hmm
[18:41] <arko> Saturday is fine
[18:41] <arko> if it ends up being 31st i'll fly in thursday to compensate jetlag
[18:41] <Lunar_Lander> hi Upu
[18:41] <Upu> hi Lunar
[18:42] <Lunar_Lander> how are you today?
[18:42] <arko> or even better, start living london time a day or two before
[18:42] <arko> who knows
[18:42] <arko> i figure a cup of coffee before the conference and i should be fine
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[18:48] <chrisstubbs> Hey all
[18:48] <eroomde> yoyoyo
[18:48] <eroomde> yo
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[18:48] <arko> yoyo
[18:49] <chrisstubbs> Just got went onto youtube and saw "Justin Bieber Gets Attacked"
[18:49] <chrisstubbs> good times :)
[18:50] <chrisstubbs> Lunar_Lander, I think I spoke too soon taking the mick with the photoshopped straw photo: http://www.youtube.com/watch?v=TX03HaM8kco
[18:51] <Lunar_Lander> lol cool!
[18:51] <chrisstubbs> the first 8 mins or so is me faffing about with batteries and a multimeter trying to figure out why the camera wont work
[18:55] <Lunar_Lander> which camera exactly?
[18:56] <Lunar_Lander> the 808 is working obviously
[18:56] <chrisstubbs> i think it was a #16 808 and a cannon a530
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[19:01] <arko> "As light as your equipment is I think you are just fine. You could file a Notice to Airmen as before but you are not subject to 14 CFR 101 with that configuration. "
[19:01] <arko> hahaha
[19:01] <arko> this is what happens when you ask the faa if you can fly a pico
[19:02] <arko> smaller than a pigeon, eh screw it, let it fly
[19:02] <nigelvh> Yep. If you don't meet the four rules, they don't care.
[19:02] <arko> faa guy has been nice
[19:02] <nigelvh> http://www.eoss.org/pubs/far_annotated.htm
[19:02] <nigelvh> Right at the top of this page.
[19:03] <nigelvh> Don't meet those four rules and you're exempted from everything else.
[19:03] <nigelvh> Except the hazardous operations section, but that's just don't be hazardous.
[19:05] <anerDev> hi guys !
[19:06] <arko> awesome
[19:06] <nigelvh> That's why you don't need the two cutdown devices or the radar reflector.
[19:06] <arko> yeah
[19:06] <arko> im just doing a 350 kaymont, 48" parachute, and a 50g pico payload
[19:07] <arko> im excited
[19:07] <nigelvh> Yes, then you're definitely clear (Presuming you use light cord to fall within that reg)
[19:07] <arko> yeah
[19:07] <WILLdude> Hello
[19:07] <arko> found 50lb pink nylon cord
[19:07] <nigelvh> There you go
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[19:08] <Lunar_Lander> chrisstubbs, ah ok
[19:08] <Lunar_Lander> Upu, my TinyGPS test was not successful, it printed out SENTENCES=0 all the time
[19:09] <Lunar_Lander> when I came home I figured out why
[19:09] <WILLdude> Are T-Shirts that say 'NERD' on them supposed to be ironic?
[19:09] <Lunar_Lander> when I wired the programmer up, the old program was still on that set the GPS to UBX mode
[19:09] <eroomde> ask the wearer
[19:09] <Lunar_Lander> when I programmed it, the GPS still was under power and thus still had the setting to have NMEA off
[19:09] <Lunar_Lander> stupid me
[19:09] <WILLdude> I have not seen any people who I would consider 'Nerds' wearing one.
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[19:10] <eroomde> possibly then
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[19:20] <gpee> hi all, I have a question regarding tracking. Is there a way to pipe the output of fl-digi such as the lat, lon into a static map application? I'm in canada so the likelyhood of having a cell signal to track online in rural areas is low
[19:21] Nick change: lbm_ -> lbm
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[19:24] <griffonbot> Received email: Steve Aerospace "Re: [UKHAS] Flight Announcements - Elsworth launch fest
[19:28] <chrisstubbs> RocketBoy, would it be okay to use your photos from yesterday on my site?
[19:28] <RocketBoy> sure - np
[19:28] <chrisstubbs> Cheers :)
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[19:32] <griffonbot> Received email: Anthony Stirk "Re: [UKHAS] Flight Announcements - Elsworth launch fest
[19:32] <Upu> oh hi RocketBoy
[19:32] <Upu> yeah I think I heard it
[19:34] <RocketBoy> ah - thanks - spiffing I'll pass that on
[19:34] <Upu> was just a repeative tone
[19:34] <Upu> not very strong
[19:35] <Upu> just like the NTX2 keying up and down
[19:35] <Upu> don't know if that was the intention
[19:35] <Upu> no constant carrier anyway
[19:35] <RocketBoy> that may have been it - I haven't got any details of their system - I'll let you know
[19:35] <Upu> 1 sec on 1 sec off
[19:35] <Upu> should have recorded it really
[19:35] <Upu> sorry
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[19:39] <RocketBoy> np at all - not enough information flow before the launch I'm afraid.
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[19:43] <chrisstubbs> RocketBoy, any idea when we will hear more from the guys you did the flight for yesterday?
[19:46] <RocketBoy> i've just email - i'll let you know if I get anything from them
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[19:46] <Lunar_Lander> Upu, did you read my text above?
[19:46] <Lunar_Lander> hi RocketBoy thanks for the resistors :)
[19:47] <anderdev> guys ! I have a question
[19:47] <RocketBoy> Lunar_Lander: np
[19:47] <anderdev> -55 ?C can damage the circuit ?!
[19:47] <Lunar_Lander> normally not
[19:47] <Lunar_Lander> -80°C did not damage my circuit
[19:47] <Lunar_Lander> results may vary
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[19:51] <RocketBoy> chrisstubbs: PM
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[19:55] <fsphil> most ICs won't work to -80 Lunar_Lander
[19:55] <Lunar_Lander> yea
[19:55] <anderdev> ook
[19:55] <anderdev> =D
[19:55] <fsphil> most won't work at -40
[19:55] <fsphil> or at least will be unreliable
[19:55] <anderdev> :/
[19:55] <anderdev> and how can I resolve this ?
[19:55] <anderdev> how you resolve this ?
[19:56] <fsphil> insulation
[19:57] <anderdev> only polystyrene ?
[19:58] <eroomde> have the circuit be on
[19:58] <fsphil> yes that's recommended
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[20:03] <chrisstubbs> Anyone around the essex area we are having a discussion Re HAB's on the GB3DA monday night net, jump on if you are in range! http://bit.ly/17Ijs7a
[20:03] <chrisstubbs> GB3ER sorry: http://bit.ly/17IjAno
[20:05] <anderdev> fsphil this is ok ? http://www.iacpascoli.it/LAVORI/Siti%20bambini/Giusy%20Palazzolo%20&%20Giorgia%20Ciaravino/polistirolo1.jpg
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[20:09] <fsphil> I can't open long urls
[20:10] <chrisstubbs> http://bit.ly/17IkccJ shortened
[20:10] <fsphil> the polystyrene I use is for home insulation
[20:10] <fsphil> yea that'll probably work fine
[20:10] <fsphil> just make it as well sealed as possible, so the outside air doesn't flow over the board
[20:11] <fsphil> it'll generate its own heat and the insulation will keep it well above -40
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[20:11] <fsphil> still dropping packets cuddykid?
[20:14] Nick change: bertrik_ -> bertrik
[20:16] <cuddykid> fsphil: just got in - hm, signal probably not great as I haven't connected up an antenna to ntx2
[20:16] <fsphil> aah
[20:16] <fsphil> that's a nice clear sky
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[20:17] <cuddykid> yeah, just got back from walking dog - lovely out there
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[20:28] <anderdev> thank u fsphil ! =D
[20:28] <anderdev> why u can't open long url ? Lol
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[20:42] <griffonbot> @NSEballoon: CHEAPO2 High Altitude Balloon write up complete: http://t.co/NXyGQwaaCI #UKHAS @EssexHam #hamradio [http://twitter.com/NSEballoon/status/331509223777239040]
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[20:45] <jcoxon> evening all
[20:46] <fsphil> howdy jcoxon
[20:48] <arko> yoyo
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[20:51] <Willdude123> Hello
[20:51] <arko> hi willdude
[20:52] <chrisstubbs> Willdude123 i had a thought about your antenna earlier.....
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[20:54] <Lunar_Lander> hi jcoxon
[20:55] <chrisstubbs> Willdude123 http://bit.ly/17IpHbn might work with the antenna upu made, not very intrusive either so your parents may not object
[20:56] <chrisstubbs> quite a tidy setup
[20:56] <Lunar_Lander> chrisstubbs, cool writeup
[20:56] <Lunar_Lander> is a cannon camera a british invention?
[20:56] <chrisstubbs> Cheers lunar
[20:56] <Lunar_Lander> :)
[20:57] <chrisstubbs> I think cannon is based in japan
[20:57] <chrisstubbs> canon sorry
[20:57] <Lunar_Lander> yeah
[20:58] <Lunar_Lander> :P
[20:58] <Lunar_Lander> you got it
[20:58] <chrisstubbs> corrected the blog :P
[20:58] <chrisstubbs> keep spelling it that wat
[20:58] <chrisstubbs> way
[20:58] <Lunar_Lander> no problem :)
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[21:00] <chrisstubbs> cuddykid, got any new photos of the setup you are building?
[21:00] <cuddykid> chrisstubbs: which setup? :P got 2 being built at the mo
[21:00] <chrisstubbs> both
[21:00] <cuddykid> HABE Lab one - mostly built
[21:00] <cuddykid> one sec
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[21:02] <cuddykid> chrisstubbs: HABE Lab - http://imgur.com/a/IgRmI
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[21:03] <cuddykid> the other one is for a client and hasn't been built yet, but it's going to take a fairly similar form - we're dropping a 3D printed man with his own backpack containing tracking equip :)
[21:03] <Willdude123> chrisstubbs: Hmm
[21:03] <Willdude123> We have no tv antenna.
[21:03] <chrisstubbs> Ah cool yeah
[21:03] <Willdude123> Well, not like that.
[21:03] <chrisstubbs> interested to see about this glider project too
[21:04] <Willdude123> We have one in the attic.
[21:04] <chrisstubbs> Ah thats a bummer WILLdude
[21:04] <Willdude123> But that's pointless.
[21:04] <Willdude123> Because houses don't take 434mhz very well.
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[21:05] <cuddykid> chrisstubbs: ah yes, the glider is being built by 'flying wings' - and will look like: http://i.imgur.com/vs6bpS6.jpg
[21:06] <cuddykid> chrisstubbs: we've been having problems with APM autopilot so ditched it and now going with ruby autopilot - first autopilot tests have worked very well
[21:06] <chrisstubbs> is that a rendering?
[21:06] <mfa298> Willdude123: it might still work, depending where you are TV signals aren't much above 434MHz
[21:06] <cuddykid> chrisstubbs: no, just "enhanced"
[21:06] <cuddykid> will be quite big
[21:07] <chrisstubbs> awesome :)
[21:07] <cuddykid> payload bay in the centre for tracking equip + video camera
[21:08] <chrisstubbs> Planning to beat James May's record? ;)
[21:09] <cuddykid> that would be good
[21:10] <cuddykid> just a few more tests with remote at the hand then we're going to drop it from the hexacopter and see what happens - if that's successful, then increasing altitude balloon drops
[21:11] <chrisstubbs> How big is it then? I find it hard to belive how much weight those hexacopters can lift!
[21:13] <cuddykid> 48" wing span
[21:13] <cuddykid> hex can lift over 2kg
[21:13] <cuddykid> so should be fine
[21:15] <griffonbot> @nerdsville: RT @NSEballoon: CHEAPO2 High Altitude Balloon write up complete: http://t.co/NXyGQwaaCI #UKHAS @EssexHam #hamradio [http://twitter.com/nerdsville/status/331517475499933699]
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[21:35] <chrisstubbs> Evening Hix
[21:38] <arko> http://www.youtube.com/watch?feature=player_embedded&v=2lq34Ob7Gsg
[21:38] <arko> this would be a fun evening project
[21:39] <arko> layout the board in a few hours tops
[21:40] <chrisstubbs> top comment says it all
[21:41] <arko> bonus points if you can build it into a backpack
[21:41] <arko> mobile party
[21:41] <chrisstubbs> floppy party!
[21:43] <chrisstubbs> i have always wondered, are these done through the FDD IDE port or just power straight to the motor?
[21:43] <chrisstubbs> totally OT
[21:43] <chrisstubbs> lol
[21:44] <arko> the motor/direction line
[21:44] <arko> on the IDE port
[21:44] <mfa298> I'd seen one a couple of years ago which I think was controlled through the interface.
[21:44] <mfa298> I think it's along the lines of sending commands to seek to a location
[21:45] <chrisstubbs> ah ok that dosent sound too complex then if there are dedicated lines to set the direction and step the motor
[21:45] <fsphil> there used to be programs on the amiga that played sounds using the floppy motor
[21:45] <fsphil> I'm sure it wasn't too healthy for it
[21:47] <mfa298> I'm not sure if it's dedicated lines or if you have to send commands down the interface, but even sending commands shouldn't be too hard.
[21:47] <chrisstubbs> http://bit.ly/13o66v3 seems to think its dedicated pins
[21:48] <chrisstubbs> not sure if you send commands down siad pins like you say, or if its simplly setting the direction and enable pins high then pulsing the step
[21:48] <Willdude123> Recently realized my hypothetical PC build would be a hell of a lot cheaper if I used my tv instead of a monitor.
[21:50] <fsphil> not quite daft punk: http://www.youtube.com/watch?v=uT0JOIPxyE8
[21:50] <mfa298> I've heard of people using old dotmatrix printers for making music as well. Although that might be easier as you just have to work out what charaters to print
[21:52] <chrisstubbs> the wierd part of youtube has happened again http://bit.ly/13o7eyI
[21:53] <fsphil> I think the normal part is the unusual bit now... wait that makes no sense
[21:54] <chrisstubbs> sounds like a job for a pie chart
[21:54] <fsphil> forget the chart
[21:54] <fsphil> then everyone's happy
[21:55] <mfa298> here's one with a range of hardware: http://www.youtube.com/watch?v=Ht96HJ01SE4
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[21:57] <chrisstubbs> I miss windows xp theme song remixes
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[22:03] <arko> do we have any hab people here in texas?
[22:05] <arko> i also need to figure out how to estimate where this floater will go
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[22:09] <nigelvh> KT5TK is in texas
[22:09] <mfa298> I think you can get an idea of what it will do by using the CUSF predictor with a really slow descent rate (I think people use something like 1e-06)
[22:10] <arko> yeah but it runs out of weather data
[22:10] <nigelvh> Yes, the predictions only go so far into the future.
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[22:12] <arko> yeah
[22:12] <chrisstubbs> Im off, night all
[22:12] <nigelvh> I assume you've already set the time delta to 24hrs
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[22:14] <nigelvh> Also widen the lat/lon deltas if you haven't already
[22:15] <arko> yeah
[22:17] <nigelvh> Also, anyone on who works on the predictor. I found a issue.
[22:17] <arko> http://habhub.org/predict/#!/uuid=8e0a8dc4236f3c8632c0dbbf7f640704c814cfc8
[22:17] <arko> EPIC
[22:17] <arko> this is the one i will be launching at the con
[22:17] <arko> planning on it being a floater
[22:18] <nigelvh> Keep in mind that as a floater, the burst/landing predictions are totally inaccurate until it actually happens.
[22:18] <qyx_> will be lol if it gets stuck somewhere in grand canyon
[22:18] <arko> cant wait
[22:18] <arko> nigelvh: yeah totally
[22:19] <arko> i just need to avoid mil airspace
[22:21] <craag> nigelvh: What's the issue with the predictor?
[22:23] <nigelvh> Just a info swap. In the Scenario Information box, It says "Cursor range form launch: Xkm, land: Xkm and the numerical values are swapped. If I put my mouse over the landing position it says 0km to launch 51km to land.
[22:23] <nigelvh> I would submit it as an issue on github, but I'm too lazy to make an account just for that.
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[22:24] <nigelvh> If it helps, here's the prediction I ran. http://habhub.org/predict/#!/uuid=68825c4f2fec0f348f87ff84fe9ec3a66e1fabb9
[22:24] <craag> nigelvh: Red is launch, Green is land.
[22:25] <nigelvh> Oh, damn, now I feel stupid.
[22:25] <craag> It's a bit weird tbh.
[22:25] <nigelvh> Sorry.
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[22:29] <craag> np. I reckon it'd be a bit more intuitive the other way round.
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[22:30] <nigelvh> Well, I suppose my thinking it was the other way around is an indication of what I thought was intuitive.
[22:30] <nigelvh> None the less, great tool.
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[22:35] <nigelvh> Would be nice if it could grab the elevation data from google though.
[22:35] <RocketBoy> yeah - that colour scheme is the wrong way round
[22:35] <RocketBoy> red for danger
[22:36] <nigelvh> Red for stop
[22:36] <nigelvh> Green for start
[22:36] <craag> I'll raise an issue on github then.
[22:36] <RocketBoy> also red for stop (as in the flight stops)
[22:36] <RocketBoy> green for go - as in the flight starts
[22:37] <RocketBoy> however its the standard now - been that way for yonks
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[22:51] <RocketBoy> nights
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[22:51] <craag> nigelvh: Elevation data from google, for the launch site or both?
[22:52] <nigelvh> In particular, I was thinking of the launch site
[22:52] <craag> Launch site would be easy to add, landing site not so much.
[22:53] <craag> Ok, I'll look into it.
[22:54] <nigelvh> Please note that it's a fantastic piece of work. I don't mean to suddenly create a bunch of work.
[22:54] <craag> Don't point the praise at me. I didn't do any of it!
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[22:55] <craag> I've just messed around with the php/batch jobs part of it in my own fork.
[22:55] <craag> The CUSF guys actually put it together in the first place.
[22:55] <craag> And rumour is.. they're working on v2.
[22:56] <nigelvh> In any case, the point remains valid that it's a great asset to all of us.
[22:56] <craag> mm
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[00:00] --- Tue May 7 2013