highaltitude.log.20160316

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[03:04] <SpacenearUS> New position from 03IK8SUT-11 after 0311 hours silence - 12http://tracker.habhub.org/#!qm=All&q=IK8SUT-11
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[05:15] <yes> hello there
[05:15] <yes> here PY2YES
[05:15] <yes> I love baloon
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[06:48] <SM0ULC-Reb> hello
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[07:26] <DL7AD> SM0ULC-Reb: morning
[07:27] <DL7AD> Upu: are there already plans for the conference this year?
[07:27] <Upu> morning Sven, nope I think people were discussing organising it but I'm stepping out of organisation this year
[07:28] <DL7AD> ah okay. who has the rad hat?
[07:28] <Upu> possibly Steve Randal
[07:28] <Upu> +l
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[07:29] <DL7AD> Upu: thx
[07:29] <DL7AD> Upu: but will you still come?
[07:29] <Upu> I hope so all depends on when the baby decides to pop out
[07:30] <Upu> and when the conference is
[07:30] <DL7AD> ah
[07:30] <Upu> but yes likely
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[07:38] <edmoore> we need a travel scholarship
[07:38] <edmoore> for arko and darkside
[07:38] <edmoore> (and anyone else)
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[07:45] <DL7AD> edmoore: yeah that might be difficult
[07:45] <DL7AD> how much is a flight from OZ to UK?
[07:46] <edmoore> i'm not sure but a lot
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[08:11] <fsphil> about £700 return
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[08:25] <AndyEsser> morning
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[08:36] <fsphil> morn
[08:39] <AndyEsser> ing
[08:41] <R34lB0rg> good morning everyone
[08:41] <fsphil> IS IT
[08:41] <fsphil> (it is)
[08:42] <AndyEsser> what's so good about it?
[08:43] <fsphil> got past tuesday-day
[08:45] <AndyEsser> eurgh, 1 day closer to a Friday full of dealing with Sage.... :(
[08:46] <fsphil> we used to have sage here, but now we are free
[08:47] <AndyEsser> show me the way
[08:47] <AndyEsser> please
[08:47] <AndyEsser> I don't understand how such a massive POS software got to be world #1
[08:48] <mfa298> because it would be #5 if there were 4 other companies doing the same thing for long enough ?
[08:49] <mfa298> not that I've ever had to use it, but I've heard enough ...
[08:49] <fsphil> it's worse than you've heard
[08:49] <fsphil> to be fair I haven't used it in a looong time
[08:49] <AndyEsser> it's worse-ness can never be heard
[08:49] <AndyEsser> no matter how bad you've heard it is, it's still worse
[08:53] <R34lB0rg> can I say that specific impulse (in s) is the time after a rocket that can barely lift off would run out of fuel?
[09:27] <Vaizki> you say the darnest things so go ahead :D
[09:27] <Vaizki> (I have no idea)
[09:28] <Vaizki> I am delirious from fever, I put baby back ribs in the smoker for lunch but just realized it's going to be 2pm earliest when they are done..
[09:29] <Vaizki> so now I need a pre-lunch because I'm starving
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[09:31] <AndyEsser> pre-lunch... I like your way of thinking
[09:34] <gonzo_> sounds like a hobbit
[09:34] <mfa298> damn those hobitses with their 2nd breakfasts
[09:35] <AndyEsser> :)
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[09:40] <daey> .lastseen WB8ELK-6
[09:52] <SA6BSS-Mike> wb8elk-6 went down betwen seden and finland 11 days ago
[09:52] <SA6BSS-Mike> *sweden
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[10:32] <AndyEsser> gah, really must remember to switch my home server back on :(
[10:36] <fab4space> hello all
[10:37] <fab4space> are there solutions available for setting up an antenna rotator with a yagi pointing to balloon position provided by habitat?
[10:38] <fab4space> for example for SSDV reception at high bitrate
[10:39] <mfa298> fab4space: google for habrotate which is written by craag
[10:39] <gonzo_> I believe that it can be done through fldigi
[10:39] <gonzo_> snap
[10:39] <Geoff-G8DHE> To control the rotator look ay habrotate-cli from craag and PSTRotator
[10:40] <Geoff-G8DHE> dl-fldigi could but only if your receiving it, better to get it from habitat so you get launch position from start.
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[10:40] <fab4space> ok thanks I will take a look at it
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[10:41] <fab4space> if the payload has two radio s, one for telemetry with low SNR required for decoding, and one for SSDV with high SNR , that can be very interesting to use this kind of setup
[10:43] <x-f> AndyEsser, wake-on-lan from your router at home isn't an option?
[10:44] <AndyEsser> x-f: the router doesn't support it (although that would be easily fixed)
[10:44] <AndyEsser> but typically the server runs 24/7 so doesn't need it ;)
[10:44] <AndyEsser> and technically the server is on
[10:44] <AndyEsser> just waiting for me to enter a password to decrypt the file volumes :)
[10:44] <AndyEsser> so wake-on-lan wouldn't help anyway :)
[10:45] <x-f> ah..
[10:48] <SpacenearUS> New vehicle on the map: 03TA2AWO-3 - 12http://tracker.habhub.org/#!qm=All&q=TA2AWO-3
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[10:53] <R34lB0rg> https://en.wikipedia.org/wiki/Pi_in_the_Sky
[10:54] <R34lB0rg> this article needs correction
[10:54] <daey> SA6BSS-Mike: aww. it popped?
[10:58] <AndyEsser> any linux c/c++ developers here whose brain I can pick?
[10:59] <mfa298> R34lB0rg: so correct it then!
[11:01] <edmoore> AndyEsser: best to just ask the question you have, as is almost always the case on irc
[11:03] <AndyEsser> looking for a way to print string at an arbitrary row/col point in a console window
[11:04] <AndyEsser> without using a library like curses or terminfo
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[11:05] <AndyEsser> currently attempting to use the escape sequence "\033[y;xH" but it seems a bit... hacky
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[11:08] <mfa298> escape sequences would seem like the obvious option, or just give in and use a library
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[11:12] <AndyEsser> have decided to just go with escape sequences :)
[11:14] <SA6BSS-Mike> daey: no, likley rain or snow
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[11:22] <daey> SA6BSS-Mike: the water freezes on the balloon and makes it too heavy to fly? I thought WB8elk-6 was flying pretty high
[11:24] <AndyEsser> http://imgur.com/xImogjc <- this makes the control freak in me happy
[11:25] <craag> I think your lipo is unhappy AndyEsser
[11:25] <AndyEsser> Indeed
[11:25] <AndyEsser> :)
[11:25] <SM0ULC-Reb> :)
[11:25] <AndyEsser> thankfully it's all just dummy data atm :)
[11:26] <AndyEsser> I'd be a bit concerned if a battery sat next to me was 76.0 degrees C
[11:26] <craag> yes..
[11:28] <AndyEsser> having said that, I'd be concerned if I was sat next to battery... at 4814m when I'm pretty sure I'm not on a plane :)
[11:29] <craag> I jsut assumed you had a long cable ;)
[11:29] <AndyEsser> ha
[11:29] <AndyEsser> planning an umbilical yes, but not quite that long
[11:29] <cm13g09> mfa298: ping
[11:29] <AndyEsser> not sure the USB spec allows for over about 100m ;)
[11:29] <SA6BSS-Mike> daey: no it crused at about 7500m iirc
[11:30] <R34lB0rg> wow, just calculated: if you launch a rocket from the equator you save 12% fuel, if you launch from a concorde cruising at altitude over the equator you could save 26%
[11:30] <edmoore> terminator AndyEsser?
[11:31] <SA6BSS-Mike> daey: thats not a safe hight from weather
[11:32] <AndyEsser> edmoore: yarp
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[11:41] <daey> SA6BSS-Mike: i see. what is considered save? 10+k?
[11:46] <Vaizki> well I persevered and had just beer and smoked ribs for lunch
[11:46] <Vaizki> if this doesn't cure the flu, the rum cask is next
[11:46] <edmoore> daey: in general weather occures in the troposphere
[11:47] <edmoore> between the troposphere and the stratosphere is the tropopause, which is the layer in which the temperature stops getting lower with height and starts to increase with height
[11:47] <edmoore> ideally you want to be in or above the tropopause
[11:47] <edmoore> what altitude is that? well actually that changes with time of year (winter/summer) and latitude
[11:47] <edmoore> but generally it's about 10-12km
[11:48] <daey> edmoore: well i know clouds can go up to 70+km. So i assumed a best practice is the best possible answer. As avoiding weather 100% isnt possible
[11:49] <SA6BSS-Mike> daey: yeah, above 10500-11000 it should stay up for many month
[11:51] <daey> are these heights achievable with pico balloons?
[11:51] <edmoore> i don't think you have to worry about those clouds
[11:51] <edmoore> you want to not be caught in the rain really
[11:51] <edmoore> those altitudes are certainly achievable with pico balloons - look at the altitude most picos cruise at
[11:52] <edmoore> http://tracker.habhub.org/#!mt=roadmap&mz=11&qm=3_days&f=UBSEDS14
[11:52] <edmoore> observe the current and maximum altitude
[11:53] <craag> Info on ubseds14: http://www.bristol-seds.co.uk/hab/flight/2016/03/07/ubseds14.html
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[11:58] <Ben-AstroSoc> yeah, so I don't have the pinout for the serial cablel i'm using so there could be something backwards
[11:58] <Ben-AstroSoc> going over it atm
[11:59] <Ben-AstroSoc> ok swapped some stuff over and it's less off
[11:59] <Ben-AstroSoc> got empty NMEA coming out no
[11:59] <AndyEsser> like switching channels, Ben-AstroSoc
[11:59] <AndyEsser> ;)
[12:01] <Ben-AstroSoc> >_>
[12:01] <AndyEsser> sorry :P
[12:01] <Ben-AstroSoc> presumably if gps has no fix it'll send empty NMEA
[12:07] <AndyEsser> In my experience it'll still send the GPGGA sentence
[12:07] <AndyEsser> but the lat/long etc fields will be empty
[12:14] <Ben-AstroSoc> yeah, that's what i've got
[12:15] <Ben-AstroSoc> $GNGGA,,,,,,0,00,99.99,99.99,99.99*2E
[12:18] <AndyEsser> Yea, how long has it been powered on?
[12:23] <Ben-AstroSoc> ages
[12:23] <Ben-AstroSoc> i'm nowhere near a windiow tho
[12:30] <AndyEsser> that'll be the issue :(
[12:30] <AndyEsser> or you've touched the antenna
[12:30] <SpacenearUS> New position from 03BARC after 036 days silence - 12http://tracker.habhub.org/#!qm=All&q=BARC
[12:31] <Ben-AstroSoc> not getting anywhere with this string looping, hmm
[12:32] <Ben-AstroSoc> oh damn, maybe i am
[12:33] <Ben-AstroSoc> i love discovering i'm an idiot
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[12:34] <AndyEsser> better than discovering someone else whose work you're relying on is an idiot
[12:35] <Ben-AstroSoc> true
[12:35] <Ben-AstroSoc> ok i can debug my USART now
[12:35] <AndyEsser> \o/
[12:36] <Ben-AstroSoc> fixed all the other crap
[12:36] <Ben-AstroSoc> ^^
[12:37] <AndyEsser> o crap - it's lunchtime
[12:37] <AndyEsser> :)
[12:37] <Ben-AstroSoc> i get kicked out of this lab in half a n hour
[12:37] <Ben-AstroSoc> doing as much as i cna until i have to make do withteh slooooow society computers
[12:39] <Ben-AstroSoc> well the issue's super simple, its not transmitting any UART at all
[12:39] <AndyEsser> :(
[12:39] <AndyEsser> interesting...
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[12:43] <junderwood> !dial BARC
[12:43] <SpacenearUS> 03junderwood: Latest dials for 03BARC 10(0eed): none
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[12:44] <Geoff-G8DHE-Lap> !dial BARC
[12:44] <SpacenearUS> 03Geoff-G8DHE-Lap: Latest dials for 03BARC 10(0eed): none
[12:44] <Geoff-G8DHE-Lap> It'll be a while before it gets over my local horizon anyway!
[12:47] <junderwood> Looks like the flight doc is wrong again. 434.450
[12:48] <Geoff-G8DHE-Lap> Oh right I'll tune up a bit then ....
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[13:12] <AndyEsser> How much testing do you guys do with new trackers you've designed?
[13:13] <mattbrejza> it seems to vary..
[13:16] <craag> According to budget and timescale you can fill in the gap between it working hooked up to the psu on your desk, and it climbing away from you on a 1600g balloon with 3 gopros
[13:16] <craag> A common half-way step is launching just the tracker on a 100g balloon for example
[13:17] <craag> Running it off batteries for full battery life periods, and sending someone to drive around with in a car while you receive it at home, or similar is recommended at minimum
[13:18] <craag> Make sure you can get >1km line of sight receive from it
[13:18] <craag> then you know you've got the Coxon Kilometre handled :)
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[13:22] <Vaizki> AndyEsser: I've been testing mine for a year now, once a month.. it's an aging test ;)
[13:22] <AndyEsser> Coxon Kilometre? There's obviously a story there :P
[13:22] <AndyEsser> Ok cool - so I'm not going overboard by planning soak tests, freezer tests, drop tests, etc
[13:23] <Vaizki> aging test: leave it on a shelf and do other stuff
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[13:23] <AndyEsser> heh
[13:23] <craag> That's not overboard at all
[13:24] <AndyEsser> planning on some hardware-in-the-loop type tests pumping NMEA strings into it
[13:24] <craag> !glossary
[13:24] <craag> hmm
[13:24] <Vaizki> https://ukhas.org.uk/general:glossary
[13:24] <AndyEsser> randomly toggling pins high/low at various frequencies etc
[13:24] <Vaizki> vaizki-bot to the rescue!
[13:24] <AndyEsser> bit slower - but gets there :P
[13:25] <AndyEsser> I do love the Ed Rule
[13:25] <AndyEsser> :)
[13:25] <AndyEsser> ha! HAB After Bacon
[13:26] <AndyEsser> how have I not been directed at this before?!
[13:26] <Vaizki> you're supposed to read the whole wiki you know..
[13:27] <craag> yeah
[13:27] <craag> how dare you not have
[13:27] <AndyEsser> my bad
[13:27] <AndyEsser> I shall go and sit on the naughty step with my tablet and read it
[13:28] <craag> you'll need the charger ;)
[13:29] <AndyEsser> Vaizki: the wiki is not the most intuitive thing
[13:29] <craag> It is not
[13:29] <Vaizki> yes I know and I have not read all of it :)
[13:30] <craag> We've had a few brave volunteers saying they'll organise it
[13:30] <Vaizki> it helps just to skim the page titles at https://ukhas.org.uk/frontpage:general?do=index
[13:30] <AndyEsser> I read the For Beginners bit - anything else is superfluous
[13:30] <craag> Most have started and seriously, never been heard from again.
[13:30] <AndyEsser> craag: it's on my list - at some point
[13:30] <AndyEsser> for now I just tend to correct/edit stuff as I see problems
[13:30] <craag> Noo we'll lose you too!
[13:30] <craag> There's something in there...
[13:30] <AndyEsser> craag: that's a good thing, right?.
[13:30] <craag> deep in there..
[13:31] <craag> they dug the caverns of hab knowledge too deep
[13:32] <craag> and awakened a beast of launchsite wind and tall trees
[13:32] <AndyEsser> heh
[13:34] <fsphil> a moments silence for those lost to the wiki
[13:34] Action: fsphil sets mode +m
[13:36] <Vaizki> hmm
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[13:51] <AndyEsser> I should probably get back to do actual work rather than fun HAB stuff
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[13:56] <daey> maybe they just ascended
[13:56] <daey> you find them in #higheraltitude now :p
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[15:03] Action: cm13g09 forgot about the glossary
[15:03] <cm13g09> Just caused amusement in the office!
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[15:17] <daveake> Probably ought to add SHARP to that list
[15:17] <AndyEsser> Stay Home And Really Plan?
[15:17] <daveake> No I don't think they did any of that
[15:18] <daveake> Truly a team where the ability to fail was a sum of parts
[15:18] <AndyEsser> ah
[15:21] <mattbrejza> not entirely sure thats fair. more of a case of being assigned a deadline they couldnt meet or move
[15:26] <daveake> OK fair enough
[15:27] <craag> And they were aero engineers assigned an electronics project
[15:27] <craag> (hence the carbon fibre pieces of it!)
[15:27] <AndyEsser> hmm... carbon fibre
[15:28] <craag> one of whom had some experience with C# from a module, and the rest had never really coded before.
[15:28] <craag> their temperature simulations of the enclosure and such were impressive.
[15:29] <craag> (and scary, those things get hot)
[15:29] <AndyEsser> I need to hurry up and get the enclosure designed
[15:30] <daveake> My first Pi with the excessive battery voltage and linear regulators got pretty warm
[15:32] <fsphil> my enclosures don't really get designed as such. just cut until everything fits
[15:32] <AndyEsser> fsphil: yea, I don't just want a boring white bit of polystyrene ;)
[15:32] <AndyEsser> doesn't sit right with me
[15:32] <AndyEsser> :P
[15:33] <Vaizki> it has to be blinding pink so the shape is irrelevant
[15:33] <fsphil> whatever you do, don't make it black / silver
[15:33] <AndyEsser> fsphil: o
[15:33] <craag> or green
[15:33] <AndyEsser> Vaizki: "has to be"?
[15:35] <daveake> hmm Per Lindstrand just followed me. If he booked with low altitude flights? :p
[15:35] <daveake> Er auto wrong
[15:35] <AndyEsser> Is he the balloonist for the Virgin/Branson balloons?
[15:35] <daveake> Is he bored with ...
[15:35] <daveake> Yep
[15:35] <AndyEsser> thought the name sounded familiar
[15:35] <fsphil> or animated
[15:36] <AndyEsser> fsphil: was going to go with beautifully engineered aluminium case with rubber impact spots at specific points
[15:37] <craag> AndyEsser: Would you like to be hit on the head with it?
[15:37] <AndyEsser> craag: it'll be lighter than the equivalent poly box
[15:37] <AndyEsser> (in theory)
[15:38] <daveake> still needs to provide a soft impact
[15:38] <AndyEsser> that's what the rubber impact spots are for (primarily corners)
[15:38] <daveake> I landed a soft payload on a car once
[15:38] <AndyEsser> I saw the pic
[15:38] <daveake> So just consider if you'd end up with a bill for repainting
[15:39] Action: AndyEsser removes phone number from payload
[15:39] <AndyEsser> :)
[15:41] <AndyEsser> we very nearly bought a metal fabrication company last year
[15:41] <AndyEsser> that would've been so helpful
[15:42] <number10> hopefully not for balloon payloads
[15:44] <Vaizki> AndyEsser: it's for luck
[15:45] <daey> iron sky
[15:46] <AndyEsser> Vaizki: ah fair enough
[15:48] <Vaizki> also please note that with a polystyrene box, you have a nice diaelectric to protect your gps antenna etc, you don't have to take it outside.. with an aluminum box, you're in a faraday cage.
[15:49] <AndyEsser> Vaizki: I'm using external antenna anyway
[15:50] <Vaizki> I'm not saying you can't, just parroting things I've learned :)
[15:50] <AndyEsser> o I know :)
[15:50] <AndyEsser> and I know that 'best practice' but just be a hobby craft poly box
[15:50] <AndyEsser> but going through all the effort of designing the tracker, and software, and doing simulations and stuff
[15:50] <Vaizki> it also keeps the temp just a bit more stable
[15:50] <Vaizki> yes yes you have a tcxo ;)
[15:50] <AndyEsser> to then just throw it into a poly box with holes cut in it seems... bad
[15:51] <AndyEsser> Vaizki: not an excuse for no insulation :)
[15:51] <AndyEsser> my plan is for higher density insulation inside the box to protect the components
[15:51] <AndyEsser> we'll see how it performs once it's built
[15:51] <AndyEsser> can always change my mind and just go to hobbycraft
[15:51] <AndyEsser> :)
[15:51] <Vaizki> it's also called heavy insulation
[15:52] <number10> just get some foam sheets and make up the box
[15:52] <daveake> yes, no need for metal
[15:52] <daveake> cut and sniff (UHU Por)
[15:54] <daveake> If you still feel the need to over-engineer this, make a CNC foam cutter
[16:02] <AndyEsser> hmm
[16:02] <AndyEsser> but
[16:02] Last message repeated 1 time(s).
[16:02] <AndyEsser> :(
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[16:09] <fsphil> CNC foam cutter. that sounds fun
[16:09] <Vaizki> AndyEsser: so here's what a pro HAB payload looks like http://intermetsystems.com/index.php/products/imet-1
[16:10] <Vaizki> start drinking milk!
[16:12] <AndyEsser> Vaizki: I was eying up the Project Loon payload enclosures - quite nice as well, all insulating material type thing with velcro flaps to get access and stuff
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[16:16] <Vaizki> I liked their first payload best: https://cdn2.vox-cdn.com/thumbor/psJME-MOklEd0d24vFDmHNsebIQ=/1200x0/filters:no_upscale()/cdn0.vox-cdn.com/uploads/chorus_asset/file/3460884/project-loon-wm-001.0.jpg
[16:16] <Vaizki> whoa.. functions in urls.. madness :)
[16:16] <fsphil> eek
[16:17] <Vaizki> note white polystyrene box + gps antenna inside :)
[16:17] <AndyEsser> Vaizki: he does not look impressed
[16:17] <Vaizki> he's getting the job done
[16:17] <AndyEsser> Fine!
[16:17] <AndyEsser> ruin all my fun :(
[16:17] <Vaizki> ;D
[16:18] <Vaizki> I am the funvampire
[16:18] <AndyEsser> don't know why I listen to you guys, not like you know what you're talking about :P
[16:18] <fsphil> "3 years of work, and $15 million has produced this"
[16:18] <AndyEsser> fsphil: hehe
[16:18] <Vaizki> https://cdn1.vox-cdn.com/thumbor/NgDayyX0frxl_98sEctdqNoSmM4=/1200x0/filters:no_upscale()/cdn0.vox-cdn.com/uploads/chorus_asset/file/3460888/project-loon-wm-002.0.jpg
[16:18] <Vaizki> well they're more like flying pc cases now..
[16:18] <fsphil> whoever came up with those urls should be banned from the intenret
[16:18] <fsphil> or the internet
[16:18] <AndyEsser> Vaizki: yea, the far left is more what I'd be happy with :P
[16:18] <Vaizki> that thing is going to hurt when it lands
[16:19] <Vaizki> and it's not going to stay in that shape
[16:19] <Vaizki> but that's what hammers are for
[16:19] Action: AndyEsser updates parachute calculation for a 1m/s descent
[16:19] <AndyEsser> :P
[16:20] <AndyEsser> Ben-AstroSoc: Are you still on schedule for a 21st launch?
[16:20] <Vaizki> and don't fly the hammer
[16:20] <Vaizki> now where it that pic...
[16:20] Action: AndyEsser goes to boot to pack tools
[16:20] <AndyEsser> thinks: Hmm, where's my hammer
[16:20] <AndyEsser> realises it's in the payload box
[16:22] <Vaizki> AndyEsser: https://dl.dropboxusercontent.com/u/63720513/Images/Funny/pico.jpg
[16:23] <Vaizki> benchmark
[16:23] <AndyEsser> Vaizki: errr...
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[16:28] <AndyEsser> I really want an uplink for my payload :(
[16:28] <AndyEsser> Second System...that'll have it
[16:28] <AndyEsser> :)
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[16:43] <Vaizki> PS/2 payload with microchannel for sensors
[16:45] <Vaizki> I got distracted last week and now took delivery of this.. :) http://www.theairwheel.com/buy/q3black340wh/
[16:45] <Vaizki> oh it sold out.. anyway, going to kill myself before easter for sure
[16:46] <AndyEsser> Try not to
[16:47] <Vaizki> there is no try
[16:47] <AndyEsser> Do not to
[16:47] <AndyEsser> ;)
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[17:41] <Ben-AstroSoc> AndyEsser: no, pushing back to 2nd weekend april onwards
[17:41] <Ben-AstroSoc> wanted more time for testing
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[17:41] <Ben-AstroSoc> 2nd year coursework caught up wiht us >_>
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[17:45] <Ben-AstroSoc> I came up with an amazing idea for my final year project then realised I have my entire placement year first <_<
[17:47] <PE2BZ> If anyone from the UK has interest in Radiosondes: A RD94 dropsonde has been dropped this afternoon 14:50 UTC at 52.65762 N 0.67886 E near Swaffham.
[17:48] <SpacenearUS> New vehicle on the map: 03HAPROS - 12http://tracker.habhub.org/#!qm=All&q=HAPROS
[17:49] <Ben-AstroSoc> does anyone have a source for the math to work out something like vol helium vs mass held at neutral bouyancy?
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[17:50] <Ben-AstroSoc> never mind found some lifting numbers
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[17:54] <DL7AD_> good evening
[17:55] <PE2BZ> Good Evening / Gutenabend !
[17:55] <DL7AD_> thomas and i are going to launch a SSDV/APRS Floater tomorrow.
[17:56] <DL7AD_> launch time will be around 7...8am
[17:56] <DL7AD_> hi PE2BZ ;)
[17:56] <DL7AD_> PE2BZ: it will float into your direction
[17:56] <PE2BZ> That´s nice ! From where ? Wind is bringing it to me and I have a day off !!
[17:56] <DL7AD_> berlin
[17:56] <DL7AD_> https://drive.google.com/file/d/0BwzVllHCGu5FRWE4MFNLNDNrMms/view?usp=sharing
[17:57] <DL7AD_> it's solar driven
[17:57] <DL7AD_> it will stop SSDV/UKHAS-transmission below 3.7V or if there's no sun available
[17:58] <DL7AD_> APRS will be transmitted all the time
[17:58] <PE2BZ> That´s nice ! I wouldn´t mind to catch it here, but wouldn´t mind it to float for ¨ever¨ either !
[17:58] <PE2BZ> What SSDV protocol ? RTTY ?
[17:58] <DL7AD_> RTTY yes
[17:58] <DL7AD_> but i hope it will fly for several days
[17:58] <PE2BZ> Can you paste the payload info ?
[17:58] <DL7AD_> we will fly qualatex 36"
[17:58] <DL7AD_> payload info?
[17:59] <PE2BZ> Frequency, shift and so on ?
[17:59] <DL7AD_> ehm we did not decide yet. but i assume 2m
[17:59] <DL7AD_> because we couldnt manage a mixed filter
[17:59] <DL7AD_> for 2m and 70cm
[18:02] <PE2BZ> Ok. I understand. Currently typing a message on the dutch radiosonde group. When will the frequency be ¨shure¨ ?
[18:02] <DL7AD_> midnight
[18:03] <PE2BZ> can you drop me a message on pe2bz@pe2bz.nl ?
[18:04] <DL7AD_> PE2BZ: i will do so
[18:04] <PE2BZ> Danke !
[18:05] <PE2BZ> Received my first ¨live¨ dropsonde above the UK today ! RD94 from Vaisala from the G-Luxe meteorologic research airplane.
[18:08] <PE2BZ> DL7AD_ do you have a prediction link ?
[18:09] <DL7AD_> http://predict.habhub.org/#!/uuid=4d85e2de9992913cded9b7a22f142357e73fd43f
[18:11] <PE2BZ> DL7AD_ thanks !
[18:11] <DL7AD_> i'm afk for 15min
[18:12] <PE2BZ> rgr
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[18:18] <SpacenearUS> New vehicle on the map: 03XABEN0 - 12http://tracker.habhub.org/#!qm=All&q=XABEN0
[18:31] <Ben-AstroSoc> has anyone got any experience with RC blimps?
[18:31] <DL7AD_> PE2BZ: back
[18:32] <SpeedEvil> edmoore did some stuff with big blimps
[18:32] <SpeedEvil> Ben-AstroSoc: what sort of size?
[18:32] <SpeedEvil> well 'big' - 4m or so long
[18:32] <Ben-AstroSoc> looking to hold ~500g at neutral bouyancy at sea level
[18:32] <Ben-AstroSoc> researching a potentinal final year project
[18:32] <Ben-AstroSoc> potential*
[18:33] <SpeedEvil> Air is ~1.2kg/m^3.
[18:33] <SpeedEvil> So you need ~0.4m^3 unbalanced by the balloon envelope.
[18:33] <SpeedEvil> and gas
[18:34] <SpeedEvil> If the envelope is 100g, then that's ~0.6m^3 or so.
[18:34] <Ben-AstroSoc> yeah
[18:34] <Ben-AstroSoc> been looking around for smallish ablloons
[18:35] <SpeedEvil> 0.6m^3 is not a smallish balloon
[18:35] <SpeedEvil> at least not smallish indoor
[18:35] <SpeedEvil> it's small compared to wales.
[18:35] <Ben-AstroSoc> smallishish
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[18:35] <Ben-AstroSoc> was looking at building an IMU and demonstrating attitude control
[18:37] <SpeedEvil> you're looking at a meter in diameter
[18:37] <SpeedEvil> for a sphere
[18:37] <SpeedEvil> 500g is quite heavy - why that heavy?
[18:38] <SpeedEvil> 500g would get you a quadcopter with a flight time of 20 minutes, and a payload of a few hundred grams, with INS/GPS/FPV
[18:38] <Ben-AstroSoc> pure ballpark guess at weight of electornics
[18:38] <Ben-AstroSoc> probably highballing it a lot
[18:39] <SpeedEvil> what is your payload?
[18:40] <Ben-AstroSoc> this is entirely provisional atm, but a motor, gyroscopes + sensors, battery
[18:41] <SpeedEvil> do you mean MEMs gyros?
[18:41] <SpeedEvil> http://www.banggood.com/Upgrade-NAZE32-SP-Racing-F3-Flight-Control-6-DOF-10-DOF-for-Milticopter-p-1010232.html is an example of an IMU board.
[18:42] <Ben-AstroSoc> both MEMs and some form of reaction wheel
[18:42] <Ben-AstroSoc> not decided on contorl method
[18:42] <SpeedEvil> This is a 10 axes board, which has GPS
[18:42] <SpeedEvil> addable
[18:42] <SpeedEvil> http://www.banggood.com/NZ-GPS-For-NAZE32-Flip32-6dof-10dof-Best-For-QAV250-ZMR250-Multicopter-Quadcopter-p-1015134.html plus
[18:42] <Ben-AstroSoc> given that its my final year project i'd be building the entire thing from scratch
[18:43] <Ben-AstroSoc> also got a year to nail any specifics down, just looking at feasibility really
[18:43] <SpeedEvil> LASER comms for airborne stuff would be cool.
[18:43] <nick_> Ben-AstroSoc: what subject are you studying?
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[18:44] <Ben-AstroSoc> electronics + computer science
[18:44] <SpeedEvil> http://www.ebay.co.uk/itm/20kpps-laser-light-show-galvo-scanner-max-30kpps-without-show-card-/181533050340?hash=item2a443685e4
[18:44] <Ben-AstroSoc> looking to go into spacecraft control
[18:44] <nick_> Building something from scratch is a very risky strategy for a uni project.
[18:44] <SpeedEvil> yeah
[18:44] <SpeedEvil> Or rather - building outside what you're required to build.
[18:45] <Ben-AstroSoc> i would have to talk to a supervisor regarding the scope of what i focus the project on
[18:45] <nick_> Really, building anything is a risk unfortunately.
[18:45] <SpeedEvil> Sometimes you're required to build things though.
[18:45] <SpeedEvil> Don't go too interesting though
[18:45] <nick_> If you can stick to software only (even on hardware you already developed), that takes a lot of the risk away.
[18:45] <Ben-AstroSoc> yeah
[18:45] <Ben-AstroSoc> i have my placement year to potentially come up with some hardware
[18:45] <SpeedEvil> advanced software on commercial hardware can be useful
[18:46] <nick_> The problem is that actually making things can introduce random large delays.
[18:46] <Ben-AstroSoc> idk was just an idea
[18:46] <Ben-AstroSoc> would like to do something relevant to my chosen industry
[18:46] <SpeedEvil> the above - for exmaple - is just a STM32 + MEMS sensors in a little dev-board
[18:46] <nick_> What kind of project timeline does your uni do?
[18:46] <nick_> Or I guess your department.
[18:46] <SpeedEvil> You can use it to code your own software, or replace or add additional sensors
[18:47] <nick_> (NB, there are some ST made STM32 + mems sensor deve boards you can just use that are known to work)
[18:47] <nick_> They're dirt cheap, buy a number of them in advance of any project.
[18:47] <Ben-AstroSoc> project is ~500hrs over a year
[18:47] <nick_> 2 days per week over the year?
[18:48] <Ben-AstroSoc> its a masters year so it is fuill of other stuff
[18:50] <nick_> I've found that the key to a good project is that you spend as much of your time doing "interesting" stuff, and as little time doing stuff that is actually fun as possible.
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[18:53] <nick_> Defining interesting is not easy, but you should be thinking "is this something a graduate student would spend their time on?"
[18:53] <nick_> And not do a project that a graduate student would get someone in the electronics workshop to do for them.
[18:54] <nick_> Also, it really helps if your supervisor has some interest in what you're doig.
[18:55] <Ben-AstroSoc> yeah
[18:55] <Ben-AstroSoc> theres a couple with robotics interests
[18:55] <Ben-AstroSoc> or contnorl
[18:55] <SpeedEvil> :)
[18:55] <SpeedEvil> I've pondered comms-links for UAVs.
[18:56] <SpeedEvil> Instead of doing FPV say - take a whole panoramic image on the UAV, and then transmit only actual changes between panoramas.
[18:56] <Ben-AstroSoc> uni specialises in photonics/comms but it doesnt reall yinterest me
[18:56] <nick_> I wouldn't take a student who wants to do their own project. That kinda sucks, but it's the truth.
[18:56] <nick_> Ben-AstroSoc: Southampton?
[18:56] <Ben-AstroSoc> aston
[18:57] <nick_> Aston!
[18:57] <nick_> So it also specialises in moaning about Randy Lerner?
[18:57] <Ben-AstroSoc> we moan about richard reeves now /s
[18:58] <Ben-AstroSoc> potential isnide joke
[18:59] <nick_> Yeah, that's lost on me.
[18:59] <nick_> For my sins (or more accurately because of my Dad's family) I'm nominally a villa fan.
[18:59] <Ben-AstroSoc> wasn't sure if you went there or not
[18:59] <Ben-AstroSoc> ah
[19:00] <nick_> I've been nearby. My dad actually went to uni there.
[19:01] <Ben-AstroSoc> oh, cool
[19:01] <Ben-AstroSoc> normally we propose our own projects so
[19:01] <nick_> Really?
[19:01] <nick_> That's a neat iead.
[19:01] <nick_> idea.
[19:02] <nick_> Just the other day I got hassled about offering a project for a final year student next year.
[19:02] <Ben-AstroSoc> theres some set research based ones but the acedemic stuff doesnt interest me as much
[19:03] <nick_> Our students get to rank their preferred projects, but cannot define their own.
[19:03] <nick_> Unless maybe they've already worked on something as a summer student or whatever.
[19:04] <nick_> Doing summer projects or a sandwich year is significantly better than a final year project, do those if you can.
[19:05] <Ben-AstroSoc> i have a year at RAL space first :)
[19:06] <nick_> Cool.
[19:06] <nick_> I almost worked there for a year.
[19:06] <nick_> Instead I went up to Daresbury, which is the particle acceleator STFC lab.
[19:07] <nick_> RAL has the advantage that there's a decent number of students there for the year.
[19:08] <Ben-AstroSoc> yeah, i had 2 interviews at positions for RAL and 1 in daresbury
[19:08] <Ben-AstroSoc> then I google maps'd the place and decided I'd rather be in oxford
[19:09] <nick_> lol
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[19:09] <PE2BZ> DL7AD_ I am out for my job. Have to fix a transportation system. Will listen for your Hab tomorrow ! AFK
[19:09] <Ben-AstroSoc> the space stuff was more relevant to me anyway :')
[19:09] <nick_> I actually really liked living up in Cheshire. Oxford is OK though.
[19:09] <nick_> Try to live somewhere that doesn't make your commute a real pain though.
[19:10] <Ben-AstroSoc> yeaaaah
[19:10] <Ben-AstroSoc> i commute 3 hours a day to uni at the moment
[19:10] <Ben-AstroSoc> not making that mistake again
[19:10] <nick_> So basically you probably want to live to the South of the centre, assuming you'll take the bus to RAL.
[19:10] <Ben-AstroSoc> not really looked too much into it yet
[19:11] <Ben-AstroSoc> all I know is house prices in didcot are extortionate
[19:11] <Ben-AstroSoc> waiting on house share details
[19:11] <nick_> Good one.
[19:12] <nick_> Didcot is pretty cheap for places near here.
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[19:15] <Lunar_Lander> hello
[19:16] <Ben-AstroSoc> i'll sort something out
[19:18] <Ben-AstroSoc> gonna spend the next few months coming up with some space related proposals for final year
[19:18] <Ben-AstroSoc> given that i wanna do a year at cranfield afterwards its probably a good idea
[19:24] <nick_> Yeah, so the major bonus of doing a year of real work is that applying to other places then becomes a lot easier.
[19:25] <Ben-AstroSoc> yeah
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[19:33] <Lunar_Lander> cranfield is quite interesting as they flew a bacteria collector on BEXUS
[19:35] <Ben-AstroSoc> oh?
[19:37] <Lunar_Lander> yeah
[19:37] <Lunar_Lander> http://www.cass-e.com/cranfieldbexus/Welcome.html
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[20:29] <kc2uez> hey guys, I am helping a high school with a HAB project. Next launch will be in april. The kids want to this time do a live stream from the balloon. So far we just record and playback after recovery. Someone suggested amateur television, but I was looking at the setups and they will go over our budget. Target altitude is about 70,000ft and distance about 100 miles
[20:29] <SpeedEvil> kc2uez: where are you?
[20:29] <kc2uez> upstate ny
[20:29] <SpeedEvil> Legality may be more important than technicality.
[20:29] <SpeedEvil> Ah.
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[20:32] <kc2uez> I don't know if there is a cheap way to do it. I was also looking at some of those cameras for quad copters, maybe adding some amplifier and on ground use some sort of tracking system
[20:33] <kc2uez> I say ditch the idea, but the kids are really set on that
[20:35] <kc2uez> I saw a couple of projects using a raspberry pi doing SSTV, but meh..
[20:40] <fsphil> still images are quite simple but video is quite a lot more data
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[20:41] <fsphil> it needs more power than the typical radio modules we use
[20:42] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[20:44] <fsphil> not sure where you'd be best to get a transmitter. any ATV activity in your area?
[20:46] <SpeedEvil> I'm unsure what you could get at 5.8ghz - say - with a 2.4m dish on the bottom
[20:47] <kc2uez> I have never heard of any hams doing ATV around my area
[20:50] <fsphil> it is quite a fringe activity, even among hams
[20:51] <fsphil> shame bill isn't in, he's done this before
[20:51] <kc2uez> oh really? I will hang out here more then
[20:52] <fsphil> yeah, WB8ELK
[20:52] <fsphil> he might even have been the first to do it
[20:53] <fsphil> I've been playing about a bit with ATV, but at very low power levels. not really useful for HAB
[20:54] <Lunar_Lander> I think he was back in 1987
[20:54] <Lunar_Lander> but first ever HAB was in finland in 1967
[20:55] <fsphil> ATV from HAB I mean
[20:57] <Lunar_Lander> yea that was him
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[21:59] <Evidlo> I think they've been doing high altitude balloons longer than that
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[22:15] Nick change: Crashdroid_ -> Crashdroid
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[22:28] <SpacenearUS> New vehicle on the map: 03X0 - 12http://tracker.habhub.org/#!qm=All&q=X0
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[22:47] Nick change: JDat -> DonaldTrump
[22:47] Nick change: DonaldTrump -> JDat
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[23:45] <SpacenearUS> New vehicle on the map: 03DL7AD-12 - 12http://tracker.habhub.org/#!qm=All&q=DL7AD-12
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[23:51] <SpacenearUS> New position from 03UBSEDS14 after 032 days silence - 12http://tracker.habhub.org/#!qm=All&q=UBSEDS14
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[23:55] <Laurenceb_> wow
[23:55] <Laurenceb_> epic win
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[23:59] <adamgreig> woo
[23:59] <adamgreig> my balloon is almost at the USA :P
[00:00] --- Thu Mar 17 2016