highaltitude.log.20130512

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[03:08] <nigelvh> Ping Upu
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[03:46] <heathkid> hello nigelvh
[03:46] <nigelvh> Evening
[03:46] <heathkid> heh... I grabbed 10 standard mylar "Mother's Day" balloons thinking Monday they'd be pretty cheap...
[03:46] <heathkid> there is like zero lift
[03:47] <heathkid> doubt ten of 'em would lift a pair of AA batteries!
[03:55] <nigelvh> Have you actually measured the lift?
[04:25] <heathkid> no
[04:25] <heathkid> I just weighed my tracker and 3 standard Energizer AA's... 115.83 grams (with a stubby duck antenna)
[04:26] <heathkid> that's without ANY insulation or a keychain HD camera...
[04:26] <heathkid> let me toss on the camera...
[04:26] <heathkid> 135.04 grams
[04:26] <heathkid> with the keychain
[04:27] <heathkid> I need to lose the battery holder for sure... solder them together...
[04:28] <heathkid> but I know what that'd do to the batts (potentially)
[04:28] <heathkid> if I'm not fast enough
[04:29] <heathkid> and I think my 1/4 whip might weigh less (probably the same)
[04:29] <heathkid> add counterpoise...
[04:29] <heathkid> dang...
[04:29] <heathkid> and insulation...
[04:29] <nigelvh> Yep, it adds up.
[04:30] <heathkid> fast!
[04:30] <heathkid> do you know what a single 3 ft. mylar provides in lift?
[04:31] <nigelvh> Nope
[04:31] <heathkid> so I know how many would be needed...
[04:31] <heathkid> :(
[04:31] <heathkid> I know already one won't be enough
[04:31] <heathkid> four to six maybe...
[04:31] <heathkid> for a pico
[04:31] <nigelvh> That sounds about usual
[04:31] <heathkid> APRS pico seems to be heavier payload than RTTY...
[04:32] <Randomskk> there are issues with having that many balloons too, as you probably won't manage to fill them all exactly the same
[04:32] <nigelvh> APRS pico has a larger antenna.
[04:32] <heathkid> right
[04:32] <Randomskk> still, it'l go up with enough of them :P
[04:32] <heathkid> :)
[04:32] <Randomskk> just probably one will burst before the others which might make it just descend very slowly or do other annoying things
[04:32] <heathkid> but what is enough for fast ascent to burst?
[04:32] <Randomskk> well that's kinda one of the problems
[04:32] <Randomskk> one of them bursts first
[04:33] <Randomskk> now there's not enough lift, it descends very slowly
[04:33] <Randomskk> touches down in the evening
[04:33] <heathkid> bah...
[04:33] <Randomskk> next morning, sun warms it up, there's just enough lift to pick up a little
[04:33] <Randomskk> and it starts drifting a long way at low altitude, into power lines and roads and so forth
[04:33] <heathkid> need a sensor on each balloon... one bursts... cutdown.
[04:33] <nigelvh> Just do a time cutdown.
[04:33] <Randomskk> or an altitude (or change in altitude) cutdown
[04:33] <Randomskk> time is good too
[04:34] <heathkid> Randomskk: are you in the US or UK?
[04:34] <Randomskk> UK
[04:34] <Randomskk> despite what timezones may lead you to believe
[04:34] <heathkid> okay... so say a 1km drop... cutdown?
[04:34] <heathkid> I live on UTC
[04:34] <Randomskk> heathkid: that kind of thing
[04:34] <Randomskk> heathkid: UTC <3 though sadly right now the UK is in BST so we're an hour off
[04:34] <Randomskk> very frustrating
[04:35] Action: heathkid is UTC -5 right now
[04:35] <Randomskk> I wouldn't typically be awake at this hour but my MEng project is worrying
[04:35] <Randomskk> so I am worrying at it
[04:35] <heathkid> what's a MEng project?
[04:35] <Randomskk> hmm
[04:35] <Randomskk> my master of engineering degree project
[04:36] <heathkid> mechanical engineering?
[04:36] <nigelvh> heathkid, I wouldn't rely on the alt. I'd do a cutdown if it's still up after a few hours if you want it nearby.
[04:36] <Randomskk> just "engineering", though my specialism is technically "computer and information engineering
[04:36] <heathkid> that's what my degree is in sort of...
[04:36] <heathkid> computer engineering technology
[04:36] <Randomskk> in reality I'm mostly doing info stuff, a mix of control and inference and sigproc and things
[04:37] <Randomskk> though I spent two years doing mechanical and thermo and fluids and civil and materials and god knows what else
[04:37] <heathkid> yeah... in reality... I do nothing that has to do with my degree
[04:37] <Randomskk> hehe
[04:38] <heathkid> okay nigelvh... now I'm stuck with not knowing how many balloons I need to provide lift for a fast ascent... nor how fast they will ascend for a time based cutudown which this version of the board doesn't support...
[04:39] <heathkid> I'm afraid if I do a "pico" launch... it'll end up transatlantic!
[04:39] <nigelvh> Not sure that's likely, but it may not be an easy recovery.
[04:39] <heathkid> or at least "atlantic"... and get pretty wet and non-recoverable
[04:39] <Randomskk> picos are often fairly tricky to recover
[04:40] <heathkid> I'm in Indiana... the Jetstream is usually right above me
[04:41] <heathkid> Randomskk: are you suggesting for the very FIRST launch I ever do with a new tracker board that hasn't flown yet (though a few variations already have)... I use my Kaymont 1600 and hope for the best?
[04:41] <Randomskk> if you want to recover it and have a predictable flight and all that, then quite possibly yes
[04:41] <Randomskk> you could get like a 100g latex balloon
[04:42] <heathkid> that's like $500 for a launch and probably no hope of recovery....
[04:42] <Randomskk> mylars are just more faff. harder to fill, very hard to balance the fill, and probably one will burst and the rest will sink slowly
[04:42] <Randomskk> maybe make a lighter payload ;)
[04:42] <Randomskk> (just kidding)
[04:42] <Randomskk> doing lots of mylar balloons works
[04:42] <heathkid> yeah... not sure how it could be lighter...
[04:42] <Randomskk> but they do tend to have this issue with it falling slowly
[04:42] <Randomskk> cutdowns solve that nicely
[04:43] <Randomskk> and as a bonus really help ensure it lands nearby
[04:43] <Randomskk> but you'll probably need a fair few balloons
[04:43] <heathkid> the tracker itself is only 13.83g
[04:45] <heathkid> 3 AA (standard Energizers.. I know the Ultimate Lithiums are lighter) are 84.52g in a holder...
[04:45] <Randomskk> 13.83 isn't bad
[04:45] <Randomskk> but I've seen 1xAAA trackers, I think :P
[04:46] <Randomskk> definitely worth getting lithiums
[04:46] <heathkid> stubby duck antenna for 2m is 17.44g
[04:46] <Randomskk> I guess that doesn't help
[04:46] <Randomskk> we mostly use 1/4 wave whips on 434MHz which are pretty light
[04:46] <heathkid> can't do a HX-1 based tracker on one AA
[04:47] <Randomskk> step up voltage converters :P
[04:47] <heathkid> already doing that
[04:47] <Randomskk> huh
[04:47] <Randomskk> current the problem?
[04:47] <heathkid> :)
[04:47] <heathkid> yep
[04:47] <Randomskk> fe
[04:47] <Randomskk> I forgot, those 2m radio units pack a reasonable punch huh? none of this 10mW stuff?
[04:48] <heathkid> 300mW
[04:48] <heathkid> and already looking at a 500mW transceiver
[04:49] <heathkid> sucks to be in the UK
[04:49] <heathkid> ;)
[04:49] <heathkid> sorry... couldn't resist...
[04:49] <Randomskk> we manage >700km to the radio horizon on 10mW
[04:49] <Randomskk> I don't think we're lacking for much :P
[04:49] <Randomskk> need a lot more than 300mW to get beyond radio horizon
[04:50] <heathkid> true
[04:50] <heathkid> but we're doing APRS... not RTTY
[04:50] <nigelvh> However, FM benefits a good bit from more power.
[04:50] <heathkid> I want to do APRS, RTTY, and CW
[04:50] <Randomskk> yea, aprs needs more
[04:51] <Randomskk> silly afsk
[04:51] <heathkid> plus a 70cm video downlink
[04:51] <Randomskk> that's cool
[04:51] <heathkid> ultimate goal is 1080p live video stream
[04:51] <heathkid> doubt that'll ever happen
[04:53] <Randomskk> you need like 25MBit/s for 1080p
[04:53] <heathkid> unless I do a sat uplink to downlink the video stream
[04:53] <Randomskk> _with_ compression
[04:53] <heathkid> right
[04:53] <Randomskk> maybe 30 or so
[04:54] <Randomskk> especially with high motion from swinging balloons
[04:54] <heathkid> I happen to do some contract work for a company that happens to own a few geosync sats... ;)
[04:54] <Randomskk> I guess you can use your amateur licenses though
[04:54] <Randomskk> ha
[04:54] <heathkid> who knows...
[04:54] <Randomskk> still
[04:54] <Randomskk> pointing an antenna and getting enough power to uplink 30MBit/s on a satellite band
[04:54] <heathkid> swinging balloons?
[04:54] <Randomskk> is going to be a fun challenge
[04:55] <Randomskk> swinging payloads* I guess
[04:55] <heathkid> a couple gimbles... etc... that's the easy part (just need a bigger balloon)
[04:55] <Randomskk> :P
[04:55] <Randomskk> you're not the first to say that
[04:56] <heathkid> sort of like a Steady-Cam tripod mount
[04:56] <heathkid> with a stepper based direction motor
[04:56] <heathkid> no crooked pics for me! lol
[04:57] <heathkid> just need a bigger balloon! :P
[04:57] <Randomskk> good luck :P
[04:57] <heathkid> Atlas rocket would be a lot easier... but not really in my budget.
[04:58] <heathkid> heh.. filling my Kaymont 1600 blows the budget! :)
[05:20] <heathkid> anyone have a link to a smaller latex that'll lift say... 200 grams?
[05:20] <heathkid> and a lift calculator?
[05:20] <heathkid> I want fast ascent to burst for my first launch
[05:21] <Randomskk> http://habhub.org/calc
[05:24] <arko> Blarg
[05:24] <heathkid> that doesn't seem to calculate anything...
[05:25] <Randomskk> do you have javascript enabled?
[05:25] <heathkid> yes
[05:25] <heathkid> I change things but nothing changes...
[05:26] <Randomskk> wfm
[05:26] <Randomskk> what browser?
[05:26] <heathkid> Firefox
[05:26] <Randomskk> not that it should matter. it's just simple javascript
[05:26] <Randomskk> does the results box at the bottom have any values in it at all?
[05:26] <Randomskk> and if you click Constants, does it expand?
[05:27] <heathkid> it does... but I don't see a results box
[05:27] <Randomskk> not having a results box sounds like it might be part of the problem
[05:27] <Randomskk> it should be between the input boxes and the constants box
[05:27] <Randomskk> :/
[05:30] <heathkid> with a payload mass of 225g and balloon mass of (Kaymont -200) with target burst altitude of 40000m I get:
[05:30] <heathkid> Burst Altitude: 33000 m Ascent Rate: 2.33 m/s
[05:30] <heathkid> Time to Burst: 238 min Neck Lift: 1733 g
[05:30] <heathkid> Volume: 2.66 m3 2660 L 93.9 ft3
[05:30] <heathkid> is that right?
[05:30] <Randomskk> probably about right
[05:31] <heathkid> that's a pretty slow ascent
[05:31] <heathkid> don't I want about 5m/s?
[05:31] <Randomskk> it's not appalling but it is a bit slow
[05:31] <Randomskk> 5 is nicer
[05:32] <heathkid> I tried changing it to a Kyamont 450 but nothing changed... using a 225g payload mass
[05:33] <Randomskk> check it hasn't given any errors in red text
[05:33] <Randomskk> like "Altitude unreachable for this configuration"
[05:33] <heathkid> I'll try IE
[05:33] <Randomskk> (which is what I get with a 225g payload, 450g balloon mass, 40k burst)
[05:33] <Randomskk> firefox really should work. I recommend chrome if you're going to do something different. IE is more likely to not work.
[05:33] <heathkid> hmm... I don't get that
[05:33] <Randomskk> I don't think it's your browser though
[05:34] <Randomskk> heathkid: it's in light read text, just above the results box
[05:34] <Randomskk> where the word "Result" was
[05:34] <heathkid> I don't see a "Result"
[05:35] <heathkid> IE is working better than Firefox
[05:37] <heathkid> bah
[05:37] <heathkid> really?
[05:37] <heathkid> with a 225g payload a Kaymont 2000 is a "Result (ocnfiguration suggests a possible floater)????
[05:38] <heathkid> there we go...
[05:38] <heathkid> I only need a Kaymont 3000
[05:38] <heathkid> 225g payload
[05:38] <heathkid> Burst Altitude: 40000 m Ascent Rate: 5.37 m/s Time to Burst: 124 min Neck Lift: 1701 g Volume: 4.58 m3 4580 L 161.7 ft
[05:39] <heathkid> not exactly a pico!
[05:39] <heathkid> lol
[05:40] <heathkid> that calculator is WAY off
[05:40] <heathkid> on the kaymont site...
[05:41] <heathkid> ...a Kaymont 3000 will lift a 4.4 lb. payload to 118,500 ft. before burst
[05:42] <Randomskk> uh huh
[05:42] <Randomskk> and if you plug in 2000g payload, kaymont 3000 balloon, and 36000m altitude
[05:43] <Randomskk> you get that it does get there, with an ascent rate of 6.5m/s
[05:43] <heathkid> that's 1995.806 grams!
[05:43] <Randomskk> which works fine on the calculator
[05:43] <heathkid> so which balloon do I need for a 225g payload?
[05:43] <Randomskk> I would note that the atmospheric density drops off exponentially and getting to 40km is a lot harder than 36km (118kft is 36km)
[05:44] <Randomskk> idk, not much of one. maybe a 800g
[05:44] <Randomskk> depends on how high you want to get
[05:44] <heathkid> I'd be happy with 100kft for first launch
[05:44] <Randomskk> well then plug it all in and see what you get
[05:44] <Randomskk> the calculator is pretty accurate
[05:46] <heathkid> seems a Kaymont 1200 to get me to 36km at 5.44 m/s is the best bet
[05:47] <heathkid> $$$ helium
[05:47] <heathkid> haven't weighed my paraschute or radar reflector yet
[05:47] <heathkid> how does anyone do a pico???
[05:47] <heathkid> doesn't seem possible!
[05:47] <Randomskk> light payloads (<60g total) helps
[05:48] <heathkid> the batteries weigh more than that
[05:48] <Darkside> err
[05:48] <Darkside> 1x lithium AA is 12g
[05:48] <heathkid> sorry... don't have my lithiums yet to weigh...
[05:48] <Darkside> that will run Upu's payload or my payload, for about 30 hours
[05:48] <heathkid> ONE AA?
[05:48] <Darkside> yes
[05:49] <Darkside> hell, we could use a AAA if we were OK with the shorter runtime - that'd be 7g
[05:49] Action: heathkid just fell out of his chair... give him a minute to recover...
[05:50] <Darkside> lol
[05:50] <Darkside> http://rfhead.net/wp-content/uploads/2013/04/DSC_7956.jpg
[05:56] <heathkid> that's RTTY only... right?
[05:57] <heathkid> not APRS?
[05:57] <Darkside> yes, but you can do APRS with a single AA too
[05:57] <Darkside> it just won't last as long
[05:57] <Darkside> maybe a day
[05:57] <Darkside> top
[05:57] <Darkside> tops
[05:57] <heathkid> with that board?
[05:57] <Darkside> nah, not with that board
[05:57] <Darkside> Upu has a design that does it
[05:57] <heathkid> heh... I'll give RTTY a try if you can get Upu to send me a board to test
[05:58] <Darkside> >_>
[05:58] <heathkid> If I can run off one AAA lithium for fast ascent to burst and be able to track it...
[05:58] <heathkid> then I can go from there... and go bigger and better
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[06:02] <heathkid> otherwise... I'm about to give up on this hobby... seriously.
[06:02] <heathkid> I need to get at something in the air ASAP! :)
[06:12] <heathkid> Upu please help me...
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[07:26] <eroomde> morning all
[07:26] <Darkside> morning
[07:28] <steve_____> hiya
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[07:29] <eroomde> all well?
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[07:34] <eroomde> meta
[07:35] <x-f_> all is very well, good morning
[07:36] Nick change: x-f_ -> x-f
[07:37] <x-f> i tested my tracker earlier, it worked great 8 km away, behind the trees from the backseat! :)
[07:38] <x-f> homemade GP antenna and an RTLSDR for RX
[07:39] <eroomde> nice!
[07:39] <eroomde> sounds like ready for launch :)
[07:39] <x-f> we are finally getting there :)
[07:43] <x-f> i made a measure-tape yagi yesterday, too, but it wasn't even necessary this time, however i tested it yesterday in the garden with the payload antenna removed, and was amazed how much better it was compared to the GP, when i pointed it the right direction
[07:44] <eroomde> yeah, not only do you get the increased gain, you more loose the 360 degrees of noise
[07:45] <eroomde> i know that's technically the same thing, but i mean it's more about improving the SNR, i think, than collecting more energy, with habs sometimes
[07:46] <x-f> right, will try to test it on some amateur satellites today
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[07:54] <Upu> morning
[07:56] <nigelvh> Morning upu
[07:56] <nigelvh> quick question if I might
[07:56] <Upu> sure
[07:57] <nigelvh> I submitted an order to your store for some GPS modules and ordered airsure shipping. What sort of timeframe does it take to get over here?
[07:57] <griffonbot> Received email: Steve "[UKHAS] Decoding RTTY tips"
[07:57] <Upu> good question
[07:57] <Upu> and it all depends on USPS
[07:57] <Upu> but its pretty quick normally
[07:58] <Upu> 5 working days I think
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[07:58] <nigelvh> Good deal. Don't need it tomorrow, but 3 weeks is a bit too slow.
[07:58] <Upu> all depends if customs decide to hold it up
[07:59] <nigelvh> Those jerkbags.
[07:59] <Upu> I've had customs hold a package without reason for 5 weeks once
[07:59] <Upu> I even started the claim process then one day it just turned up
[08:00] <nigelvh> Hmm
[08:00] <Upu> Aim is six working days after posting to the Rest of the World.
[08:00] <nigelvh> Good deal
[08:00] <nigelvh> That works for me.
[08:00] <Upu> Will despatch tomorrow
[08:00] <nigelvh> Yes, seeing as it's sunday for you presently.
[08:00] <Upu> Thanks for the order its appreciated
[08:01] <nigelvh> Of course.
[08:01] <nigelvh> Thank you for having the uBlox modules at good prices.
[08:02] <Upu> can you get any further west than that without falling in the sea ?
[08:02] <nigelvh> Not really.
[08:02] <nigelvh> I do live in "Shoreline"
[08:02] <Upu> indeed
[08:02] <eroomde> imaginative place name
[08:03] <Upu> you're almost Canadian
[08:03] <eroomde> that said i live in oxford
[08:03] <eroomde> which is where the river thames gets small enough that you can ford your oxen
[08:03] <nigelvh> Almost, canadia is only about an hour.5 north or so.
[08:03] <eroomde> and before that i lived in cambridge
[08:03] <eroomde> which is where there was a bridge over the river cam
[08:04] <eroomde> so....
[08:04] <Upu> anyone here from Cockermouth ?
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[08:04] <eroomde> giggle
[08:05] <Darkside> seriously
[08:05] <Darkside> is that a real place
[08:05] <eroomde> yes
[08:05] <Darkside> wow
[08:06] <eroomde> there are lots
[08:06] <eroomde> Cocks, in Cornwall
[08:06] <eroomde> Minge Lane in worcestershire
[08:06] <eroomde> Bell End, also in worcestershire
[08:06] <eroomde> Twatt in the shetlands
[08:06] <eroomde> Sandy Balls in the new forrest
[08:06] <eroomde> Fingeringhoe in Essex
[08:06] <nigelvh> Haha
[08:07] <eroomde> Butt Hole Road in yorkshire
[08:07] <Darkside> now you're just making it up
[08:07] <eroomde> well there are hundreds
[08:07] <eroomde> i'm not making any of it up
[08:07] <Darkside> butt hole road?
[08:07] <eroomde> http://en.wikipedia.org/wiki/Butt_Hole_Road
[08:07] <Upu> http://www.telegraph.co.uk/news/newstopics/howaboutthat/7263112/Britains-rudest-place-names.html
[08:07] <nigelvh> LOL
[08:08] <Darkside> haha
[08:08] <nosebleedkt> hi
[08:08] <Darkside> well
[08:08] <Darkside> we have the trifecta in adelaide
[08:08] <Darkside> lemme find a link, hold on
[08:08] <Upu> anyway Darkside you have Middle Intercourse Island
[08:08] <nosebleedkt> who wrote the ublox6 navmode bytes in thw ukhas?
[08:08] <Upu> Iron Knob
[08:08] <Upu> Mount Buggery
[08:09] <Darkside> http://www.icanhasinternets.com/wp-content/uploads/2010/07/wQo1y.jpg
[08:09] <Darkside> Upu: lol, Iron Knob is 50km from home home town
[08:09] <Darkside> their tourism advertising campaign was "Iron Knob - What a hole!" (big ironore mine)
[08:10] <Darkside> anyway
[08:10] <Darkside> Gays Arcade
[08:10] <Darkside> Erected 1885
[08:10] <Darkside> James Cumming, Architect
[08:11] <Upu> anyway moving on :)
[08:11] <Darkside> http://www.youtube.com/watch?v=MMR5JVo21wQ
[08:11] <eroomde> can i evangelise roast chicken briefly
[08:12] <eroomde> i have found the one true way of roasting one
[08:12] <Darkside> lol
[08:12] <Darkside> oh?
[08:12] <eroomde> yes
[08:12] <Upu> listening
[08:12] <Upu> I went to a farm shop locally yesterday was amazing
[08:12] <eroomde> it involves not being silly and faffy which i am prone to
[08:12] <Upu> bought lots of nice things
[08:12] <eroomde> you need a good chicken
[08:12] <eroomde> but
[08:13] <Darkside> butt
[08:13] <eroomde> just put some salt and pepper and herbs and whatever up its jacksie
[08:13] <eroomde> and then only, only, strictly only, salt and pepper on the skin
[08:13] <eroomde> about 1 tbsp of salt, really to give it a decent covering
[08:13] <Darkside> chicken crackling?
[08:14] <eroomde> then an hour or two uncovered in the fridge to get the skin really dry
[08:14] <eroomde> then into a 230C oven (not cooler) for 1 hour
[08:14] <eroomde> the end
[08:14] <eroomde> really hot, no faffing, maybe have the chicken up above the roast try and one of those little griddles so the bottom gets crisp too
[08:15] <eroomde> and it's by miles the best chicken i've ever had
[08:15] <Darkside> cool
[08:15] <eroomde> the skin is orgasmic, the flesh is really juicy as it's cooked for a hotter and shorter time so doesn't dry out so much
[08:15] <eroomde> and there is so much flavour even yough you have not been making up paprika butter to put under the skin or whatever it is you feel you ought to
[08:16] <eroomde> srsly, revelatory
[08:16] <eroomde> and so simple
[08:16] <Darkside> i am having steak tonight
[08:16] <eroomde> just dont chicken out (ha) and do 1.5hrs at 200 or whatever
[08:16] <eroomde> 230
[08:16] <Darkside> nom
[08:16] <Upu> 230 is very hot
[08:16] <Upu> is it getting cooked all the way through ?
[08:17] <Darkside> you know what else is hot?
[08:17] <eroomde> i served it with some baby new potatoes and leeks and carrots which i poached in stock then plasted in a hot pan and butter
[08:17] <Darkside> bad your mum jokes
[08:17] <Upu> 230 in a fan assisted oven
[08:17] <eroomde> upu - was 78C in the thighs after 1hr
[08:17] <eroomde> 73 being the required temp
[08:17] <eroomde> sp yep, was perfect
[08:17] <eroomde> i was worried to
[08:17] <eroomde> don;t be
[08:17] <Darkside> so much material in this conversation
[08:17] <Upu> ok fair enough
[08:17] <Darkside> 17:47 < eroomde> upu - was 78C in the thighs after 1hr
[08:17] <Darkside> upu was 78 degrees in the thighs eh?
[08:17] <Upu> lol
[08:17] <Darkside> pretty hot
[08:18] <eroomde> i'm doing it today again for some friends over from SF
[08:18] <Upu> when i'm feeling strong enough to resist a bout of salmonella i'll give it a go
[08:18] <eroomde> because it means i'll have 2 carcusses for stock
[08:18] <eroomde> which it was yum
[08:18] <eroomde> will take pictures
[08:18] <Upu> pls do
[08:19] <eroomde> don;t be scared it the skin starts looking prematurely brown after 40 mins
[08:20] <Upu> I would be :)
[08:20] <eroomde> just relax and open a bottle
[08:20] <eroomde> when the chicken comes out, leave it 10 mins to rest but not too covered as that will trap steam and reduce the crisp
[08:20] <eroomde> 10-15 mins
[08:21] <eroomde> during which time i just did the new potatoes in the stick and juices from the roasting pan
[08:21] <Darkside> goddamnit
[08:21] <Darkside> this is making me hungry
[08:21] <eroomde> this was how the man from la ruchotte said to do it
[08:21] <eroomde> because his turkey was orgasmatron
[08:21] <Darkside> why didnt you mention this an hour ago eroomde
[08:21] <Darkside> i would have gone out and bought a chicken tot ry it wiht
[08:21] <Darkside> shops are closed now :(
[08:22] <eroomde> oh, the chicken should be trussed
[08:22] <eroomde> which makes everything moreeven
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[08:38] <eroomde> Upu: the other happy thing is making up some mayo to make a feast out of the leftovers
[08:40] <jcoxon> morning all
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[08:44] <jcoxon> since wearing glass recently i've found that i need them more and more
[08:44] <jcoxon> perhaps i should have never worn them in the first place...
[08:47] <eroomde> i can believe tat
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[08:50] <number10> I noticed that about wearing glasses in the last couple of years
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[09:11] <SpeedEvil_> jcoxon: also, aging
[09:12] <SpeedEvil_> I initially thought you meant Google glass
[09:12] <jcoxon> hehe
[09:12] <jcoxon> SpeedEvil_, i'm talking 2 months
[09:12] <jcoxon> :-)
[09:12] <SpeedEvil_> your body is falling apart man!
[09:12] <SpeedEvil_> :-)
[09:13] <SpeedEvil_> I need assymetric prescriptions, with the right eye stronger than the left, for comfortable closeup work.
[09:13] <SpeedEvil_> solution?
[09:13] <Darkside> monocle, close one eye
[09:14] <SpeedEvil_> go to poundland, buy a dozen pairs of glasses, poke one lens out
[09:14] <SpeedEvil_> job done.
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[09:19] <nigelvh> poundland sounds a lot dirtier than what we call the dollar store.
[09:21] <fsphil_> is M0ZNZ here?
[09:22] <griffonbot> Received email: Steve Aerospace "Re: [UKHAS] Decoding RTTY tips"
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[09:23] <SpeedEvil_> http://www.theonion.com/audio/everythings-10000-chain-goes-out-of-business,32079/
[09:23] <SpeedEvil_> :-)
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[09:59] <nosebleedkt> guys you wrote the ublox6 nav mode bytes in ukhas wiki ?
[09:59] <nosebleedkt> its wrong
[10:03] <craag> nosebleedkt: which ones?
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[10:07] Nick change: fsphil_ -> fsphil
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[10:18] <Upu> hmm
[10:19] <Upu> mixio updated it this morning
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[10:19] <Upu> it is wrong doesn't match the code below
[10:19] <x-f> that's nosebleed's previous nickname
[10:20] <Upu> he's got it wrong
[10:22] <Upu> can't work out where he got his from
[10:22] <Upu> but I just checked it now and his was wrong
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[10:27] <fsphil> some of the other values might be different depending on the model
[10:28] <fsphil> different but not wrong
[10:28] <fsphil> probably better to fetch the current values, change just the nav mode, and send them back
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[11:02] <nosebleedkt> Upu, hi
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[11:02] <nosebleedkt> what's wrong with the ublox nav code?
[11:02] <Upu> hey nosebleedkt
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[11:03] <Upu> it was wrong I'm not sure where you got it
[11:03] <nosebleedkt> I decode it directly from u-center with my ulobx6 module
[11:03] <Upu> http://pastebin.com/yMLcPyhr
[11:03] <Upu> yup
[11:03] <Upu> click messages view
[11:03] <Upu> and its NAV-CFG5
[11:03] <Upu> just double checked it but its in the code below too
[11:04] <nosebleedkt> well
[11:04] <nosebleedkt> I was at NAV5 menu
[11:04] <Upu> did you pick CFG=NAV5
[11:04] <nosebleedkt> and it printed the bytes i wrote on the wiki
[11:04] <nosebleedkt> yes NAV5
[11:04] <Upu> it doesn't match what we've used for years
[11:05] <Upu> which we know to work
[11:05] <nosebleedkt> (Airbone < 1g) + (Auto 2D/3D)
[11:05] <nosebleedkt> well maybe for ublox5
[11:05] <nosebleedkt> but ublox6 sends me back those ones
[11:06] <Upu> its not changed for 5 6 or 7
[11:06] <Upu> http://i.imgur.com/Rdb3fgd.jpg
[11:06] <nosebleedkt> damn !
[11:06] <nosebleedkt> i will printscreen mine
[11:06] <nosebleedkt> its other bytes!
[11:07] <Upu> back soon but please if you think its wrong lets work out what the difference is
[11:07] <Upu> cheers
[11:07] <nosebleedkt> yeah
[11:07] <nosebleedkt> :)
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[11:11] <nosebleedkt> anyone had launch with ublox6 ?
[11:11] <Upu> err pretty much every launch for the last 2 years yes
[11:12] <nosebleedkt> hmm
[11:12] <nosebleedkt> well i dont have much choice :P
[11:12] <nosebleedkt> But i will printscreen it just to prove im not crazy :D
[11:12] <Upu> its fairly well documented that particular setting
[11:14] <nosebleedkt> well I have documented the codes in http://ukhas.org.uk/guides:falcom_fsa03
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[11:14] <nosebleedkt> I used to have hard experience with ucenter
[11:14] <nosebleedkt> :D
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[11:24] <nosebleedkt> Upu, omfg, you are terribly correct
[11:24] <nosebleedkt> Upu, http://pastebin.com/R50ABAx2
[11:24] <nosebleedkt> I was looking the 2nd stream
[11:25] <nosebleedkt> oh sorry
[11:26] <nosebleedkt> Upu, http://imagebin.org/257400
[11:26] <nosebleedkt> according to mine im still correct
[11:27] <fsphil> they're both correct
[11:27] <nosebleedkt> ?
[11:28] <fsphil> the default values for those other settings are probably different for each version of the ublox
[11:28] <fsphil> the filters
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[11:41] <cuddykid> can anyone think how to prevent pitot tubes from freezing up at altitude
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[11:52] <bertrik> put a heater in it? :)
[11:54] <fsphil> coil some nichrome around it and wrap it in insulation?
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[11:56] <daveake> That's silly. Just put it inside the payload :p
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[11:57] <bertrik> we got some nice results last night, building a coax stub filter to reduce interference from a really strong local transmitter into an rtlsdr stick
[11:58] <bertrik> quite crude, but it works :)
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[12:06] <SpeedEvil_> make it from plutonium 239
[12:06] <SpeedEvil_> do I mean 239?
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[13:11] <pws> there are two balloons visible on "spacenear". Any further infos?
[13:12] <Upu> they will be testing
[13:12] <Upu> not actual fligths
[13:13] <pws> Tnx! Greetings from North -DL
[13:15] <Upu> keep an eye on the mailing list
[13:15] <Upu> should give you notice of launches
[13:15] <pws> O.K....
[13:16] <eroomde> with occassionally discussions about insurance
[13:16] <eroomde> it's a riot reallysign up
[13:16] <eroomde> s/reallysign up/really\n sign up/
[13:17] <mfa298_> what happened to the plans to split the lists into launch announcments and discussion (not that I have a problem with a single list)
[13:18] <Upu> noidea
[13:18] <eroomde> master's degrees i think
[13:18] <eroomde> ignore that apostrophe please
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[13:19] <eroomde> Upu: so
[13:19] <eroomde> https://www.dropbox.com/s/tcz65v674e517cc/2013-05-12%2009.32.56.jpg
[13:19] <mfa298_> I was assuming life and normal HAB activities had got in the way
[13:19] <eroomde> that's now gone into the fridge for this eve
[13:19] <eroomde> that's it
[13:19] <Upu> thats a chicken alright
[13:19] Nick change: mfa298_ -> mfa298
[13:20] <eroomde> no butter or oil or anything
[13:20] <Upu> I look forward to seeing the result
[13:20] <eroomde> i look forward to eating it
[13:23] <number10> have you tried guinea fowl eroomde ?
[13:23] <eroomde> yes, thogh not for ages
[13:23] <eroomde> i am going to roast one the simple-but-hot way next
[13:25] <jonsowman> mfa298: yeah sorry, kinda busy atm
[13:25] <jonsowman> it's on the todo list
[13:25] <jonsowman> :)
[13:25] <jonsowman> degrees, getting in the way of everything
[13:25] <number10> we have one today - has a better flavour than chicken but not gamey
[13:25] <eroomde> sounds perfect
[13:25] <eroomde> smaller though right?
[13:26] <eroomde> like, great for 2 but a push for 4?
[13:27] Nick change: Elwell_ -> Elwell
[13:27] <number10> yes similar, and as you say slightly less meat so not for four
[13:27] <eroomde> i've a couple of californians coming to stay shortly
[13:27] <eroomde> chicken is for them
[13:28] <eroomde> ut will def try guinea fowl this week then
[13:28] <number10> how you do it sounds good - I mentioned it to mrs10 but she is sticking with the way she cooks it for now
[13:29] <eroomde> i thunk unless i'm doing the pot roast with 40 cloves and lots of olive oil, i'm gonna do it this way from now on
[13:29] <eroomde> i'm totally converted :)
[13:30] <number10> I'll have a go at that soon I think
[13:31] <mfa298> jonsowman: I'm not to worried about it. Just remembered that it was a planned change (and seemed to have a few supporters - I'm happy with the single list)
[13:31] <jonsowman> okay np
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[13:59] <Randomskk> the biggest problem was that when I was all ready to hit go
[13:59] <Randomskk> and the new list was all set up
[13:59] <Randomskk> and everything
[13:59] <Randomskk> I found out I'd have to invite people to the new list ten at a time
[13:59] <Randomskk> inevitable fatigue set in before that could be accomplished
[13:59] <Randomskk> to borrow a phrase
[13:59] <Randomskk> (thanks bode)
[14:00] <eroomde> he lost the plot
[14:00] <mfa298> sounds like a good excuse - although I can imagine it might be worse now with the extra people that have probably joined the list now
[14:00] <Randomskk> I think there are ways to make it easier, but I also thought it might be worth further consideration
[14:01] <Randomskk> I lost some confidence in the idea of one list for launch announcements and one list for everything else to some extent
[14:01] <Randomskk> idk
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[14:02] <mfa298> most of the time the single list has so little on it it hardly seems worth having two lists.
[14:03] <eroomde> true, though there may be an element of self censorchip in that regard
[14:03] <Randomskk> yes - but I feel there might be more to say if there was space for saying it
[14:03] <eroomde> because it's sort of nominally for luanch announcements and not so much rag chewing that will make hams who just want to track unsubscribe
[14:03] <mfa298> I wonder if part of the issue could be solved by having an easily viewable web version of the ical feed (and a way to have that populated reasonably easily a week or two before a planned launch)
[14:04] <eroomde> i find irc quite annoying for explaining non-trivial things
[14:04] <Randomskk> mfa298: I think email announcements are a must
[14:04] <Randomskk> as an option
[14:04] <Randomskk> but it might be nice to have something that sends the email announcement at the same time as setting up the entry in the calendar
[14:04] <eroomde> yes, you often want more than a time and place in a launch announcement
[14:04] <Randomskk> (so long as it had a big field for additional notes etc)
[14:04] <eroomde> you want to introduce your project or explain some interesting bits and bobs
[14:05] <Randomskk> eroomde: yea, irc is fine for chitchat but
[14:05] <Randomskk> long form discussion less so
[14:05] <Randomskk> I don't know if a mailing list is the solution
[14:05] <Randomskk> or a forum perhaps
[14:05] <mfa298> maybe, I'm just wondering if an easily viewable calendar /rss feed would solve announcments for most people, technically that's likely to be better but not everyone likes it
[14:05] <eroomde> hate forums
[14:05] <SpeedEvil_> Usenet
[14:05] <eroomde> http://media.tumblr.com/tumblr_ma75srb6CQ1qhn549.jpg
[14:06] <Randomskk> mfa298: maybe. it shouldn't be hard to make an easily viewable calendar online
[14:06] <Randomskk> eroomde: I was looking at http://discourse.org/ a while back
[14:06] <Randomskk> made by the people who did stack exchange etc
[14:07] <Randomskk> http://www.discourse.org/about/
[14:07] <Randomskk> starts by pointing out how terrible forums are
[14:07] <mfa298> I was thinking for the people that just want launch announcments they seem to generally want time, date, location, frequency and maybe a link to the project site (Wasn't there someone recently asking if things could be in a standard format)
[14:08] <Randomskk> there is something like that but I guess it could be improved too
[14:09] <mfa298> I suppose the ideal might be to have one way of entering the information and then have it published in a variety of ways (ics, rss, email etc.)
[14:10] <Randomskk> maybe
[14:10] <Randomskk> there are a few issues here. one is having somewhere to have good discussions and the other is having easy launch announcements for people to check
[14:10] <Randomskk> you're right - there is a better solution for the launch announcements
[14:10] <SpeedEvil_> twitter?
[14:10] <Randomskk> hah
[14:10] <Randomskk> maybe
[14:11] <eroomde> the bat signal
[14:11] <eroomde> but with the ukhas logo
[14:11] <Randomskk> I think maybe we could improve the flight doc generator to include some more freeform text fields
[14:11] <Randomskk> then have a short URL to it
[14:11] <mfa298> I'm just wondering if launch announcments should ever be replied to or if it could just be a single shot email (may not need a list that way, replies could be to the discussion list)
[14:11] <eroomde> APRS with the widest possible path settings
[14:11] <jonsowman> bat signal is a great idea
[14:11] <Randomskk> like http://habitat.habhub.org/flight/1234
[14:11] <Randomskk> which has a nicely formatted descripton of the whole flight
[14:11] <Randomskk> then that can be linked to in automatic emails or the calendar or a web page feed thing
[14:11] <Randomskk> and an rss feed I guess
[14:12] <eroomde> an airborne disease that makes you inclined to listen to 70cm
[14:13] <eroomde> train wild wolves to howl frequency information
[14:13] <eroomde> crop circles
[14:13] <Randomskk> encode the frequency information in the disease's genome
[14:13] <Randomskk> C-x M-c M-butterfly
[14:14] <eroomde> put a message in the radio 4 news announcer's headlines script
[14:14] <mfa298> smoke signals
[14:14] <eroomde> wouldn;t work in the north
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[14:17] <nick____> eroomde: better to encode it in the pips
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[14:18] <mfa298> I was starting to wonder if you could encode it into the archers theme. or you could make EastEnders useful by encoding it into that theme tune.
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[14:19] <SpeedEvil_> at least the archers started with an actual purpose.
[14:19] <mfa298> wow, I'm tempted to order from amazon just to see if they're postage info is correct: "Order in the next 42 minutes and get it by Monday, May 13."
[14:20] <fsphil> * 2014
[14:21] <Randomskk> mfa298: that's tomorrow, right? why wouldn't it be correct?
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[14:21] <mfa298> I don't know of many couriers that collect on a sunday
[14:22] <Randomskk> a fair few do these days
[14:22] <Randomskk> good business in it apparently
[14:22] <Randomskk> anyone know any linux tools for mucking with PDFs?
[14:22] <Randomskk> I want to interleave pages from two documents
[14:23] <Randomskk> and reverse the page order in one
[14:24] Nick change: nick____ -> nick_
[14:24] <mfa298> I wonder if a2ps or mpage could do it (assuming mpage is what I'm thinking of from all those years ago)
[14:24] <lz1dev> adobe acrobat if it has linux version
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[14:24] <eroomde> 14:18 < mfa298> I was starting to wonder if you could encode it into the archers theme.
[14:25] <eroomde> then no one would hear it
[14:25] <mfa298> you might also be able to do something clever with imagemagik or gd
[14:25] <jonsowman> does anyone actually like the archers?
[14:26] <Randomskk> pdftk
[14:26] <Randomskk> pdftk A=even.pdf B=odd.pdf shuffle A Bend-1 output collated.pdf
[14:26] <Randomskk> niiiiice
[14:27] <Laurenceb_> inkscape
[14:27] <Laurenceb_> on nvm
[14:30] <eroomde> i was too slow
[14:30] <eroomde> yes pdftk
[14:31] <eroomde> very good for generating documentation for large organisations
[14:31] <eroomde> you do the proper consise report in latex (as is Correct). that contains all the information that should be needed
[14:31] <eroomde> then you use pdftk to splice 4000 pages onto the end in appendices of what the customer mistakenly things they Definitely Need
[14:32] <eroomde> thinks*
[14:33] <eroomde> and it's all scripted so you need never be infected by their silliness
[14:34] <SpeedEvil_> including of course the holy Bible and the Koran in the appendices, because those are probably of more use.
[14:36] <eroomde> all your source code
[14:37] <eroomde> typeset
[14:37] <eroomde> bs standards
[14:37] <eroomde> in both senses of the acronym
[14:37] <eroomde> a copy of the propsal
[14:37] <eroomde> maybe some autogenerated diagrams from the source code
[14:38] <lz1dev> nooooo
[14:38] <lz1dev> not those ;(
[14:38] <eroomde> no one will ever read it
[14:38] <eroomde> but that's by the buy
[14:39] <eroomde> also they will want 3 identical paper copies
[14:39] <eroomde> and then they will complain that they don;t seem to be able to find good subcontractors and instead just get people like astrium
[14:39] <eroomde> who will charge £2M to get the stationary ready to begin the contract
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[14:41] <eroomde> 'blue rather than black biros eh? that'll be 8 weeks for us to redraft a contractual change notice'
[14:41] <Randomskk> you don't sound at all bitter
[14:42] <eroomde> no
[14:47] <Randomskk> oh well, have some 4f1 notes
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[14:48] <Laurenceb_> heh
[14:48] <Laurenceb_> at sstl they hired a row of printers, forklifts and lorries for the galileo contract
[14:49] <Laurenceb_> many hundreds of 160K page documents to be delivered
[14:49] <Randomskk> hahaha
[14:49] <Randomskk> oh god
[14:49] <lz1dev> "just leave it at my desk"
[14:50] <Laurenceb_> most of it was pages saying "N.A"
[14:51] <Laurenceb_> several pallets of paper and materials
[14:51] <Randomskk> lol
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[15:02] <cuddykid> are the standard size PCB header pins 6/3mm?
[15:04] <chrisstubbs> 0.1" geader us 2.45mm
[15:04] <chrisstubbs> *header
[15:04] <chrisstubbs> proper typing failure
[15:04] <cuddykid> haha
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[15:05] <mattbrejza> 2also 2.54mm
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[15:06] <cuddykid> cheers
[15:13] <Laurenceb_> you cant have experimental without mental
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[15:20] <cm13g09> Laurenceb_: referring to Debian?
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[17:09] <chrisstubbs> This is why I hate the raspberry pi: with one microusb cable it boots up fine and works perfectly. With another it appears to boot perfectly to the login screen, but he keyboard dosent work
[17:10] <Steffanx> Maybe you should hate the rpi but your power supply/cable :P
[17:10] <Steffanx> *shouldnt
[17:10] <chrisstubbs> true :P
[17:11] <chrisstubbs> I tried 2 different keyboards in every configuration of hub/usb port too
[17:11] <mfa298> power seems to be an issue on them. Although I think the first revision was the worst.
[17:11] <chrisstubbs> Yeah I have the first
[17:12] <chrisstubbs> just seemed an odd problem becuase it booted fine anyway
[17:12] <chrisstubbs> and the keyboard was on a powered hub, so even if it was a high resistance cable it didnt have to power that
[17:12] <mfa298> mine seem to be better with a powered usb hub, for usb devices. I've had all sorts of issues with stuff plugged into it directly
[17:13] <mfa298> I'm thinking of getting a new one hoping the power issues might be better (plus the extra ram would be nice)
[17:13] <chrisstubbs> On a brighter note, I can confirm the NEO6's built in USB client functionality works out the the box with the pi
[17:13] <chrisstubbs> :)
[17:15] <chrisstubbs> and the eyetoy works with fswebcam! at last!
[17:15] <cuddykid> I'm having problems getting my python script to run properly on boot up (pi)
[17:16] <cuddykid> serial for some reason just likes to stop working after a few seconds
[17:19] <chrisstubbs> <3 quality http://imgur.com/Y3tjDmH
[17:20] <cuddykid> it's a momentous occasion when you receive your first SSDV image!
[17:21] <chrisstubbs> cuddykid, how do you go about starting it? does the pi auto log in first?
[17:21] <cuddykid> I'm popping the command to run the python script in rc.local
[17:21] <cuddykid> it's running it, but not properly
[17:21] <cuddykid> and is proving a nightmare to debug
[17:22] <mfa298> is your stuff running as root or does it drop privs (I'm just wondering if there might be permission errors)
[17:22] <cuddykid> I've also tried putting it in the crontab using "@reboot" or restart, can't remember
[17:22] <cuddykid> mfa298: that was my initial thought - I'm running it as root and still having problems - also chmod'd all the various directories it uses and still not working properly
[17:23] <mfa298> best debug tool I found for writing scripts it getting it to log to syslog.
[17:23] <cuddykid> takes, save and processes images fine but doesn't output it over serial (using PySerial)
[17:23] <cuddykid> yep
[17:24] <mfa298> I was wondering if there might be permission issues on the serial port. but if it's running as root that shouldn't be an issue
[17:24] <steve_____> does it run ok when you launch it from the command line?
[17:24] <cuddykid> daveake: did you run into any problems with running your stuff on startup? (If you used PySerial)
[17:24] <cuddykid> mfa298: I'm getting a first few debug lines via serial, then doesn't work
[17:25] <cuddykid> steve_____: yep, works just as expected when I launch it
[17:25] <steve_____> perhaps its a startup order
[17:25] <steve_____> thing
[17:25] <cuddykid> seems as though it's buffering everything up but not sending - once I launch the program (so now 2 instances running) it suddenly spews everything stored out
[17:26] <steve_____> why not put a long pause at the beginning of the script to test
[17:26] <cuddykid> good idea - I'll try that later
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[17:26] <Lunar_Lander__> hello
[17:27] <steve_____> what is the OS you are using?
[17:27] <mfa298> I'm also wondering if the lack of having a stdin, stdout, stderr device could cause issues (although I don't have python experience to know if that would cause it isues)
[17:27] <cuddykid> steve_____: raspbian
[17:28] <chrisstubbs> cuddykid, are you using the serial port on the header?
[17:28] <cuddykid> yeah
[17:28] <steve_____> also are you using any environment that is not set correctly when the script executes
[17:28] <chrisstubbs> It gives you a login print and loads of debug crap on boot, which i guess you have disabled?
[17:28] <chrisstubbs> maybe somthing is still hogging the serial port at boot
[17:29] <chrisstubbs> steves delay idea could be worth a go before you open the serial port
[17:29] <cuddykid> I get "rebooting pi" or something along those lines from it, but that's it
[17:29] <cuddykid> then often I get the first few debug lines over serial, then all silent
[17:30] <mfa298> I think there are a few things that try to output to serial so they migt need to be disabled.
[17:31] <bertrik> My brother is sending me a BMP-085 board, how useful would it be for HAB? It goes down to 300 hPa, or about 9 km according to wolfram alpha
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[17:40] <Lunar_Lander__> bertrik, it works down to about 10 mbar when I chamber tested it
[17:40] <Lunar_Lander__> the problem is, if you get to a pressure that is really low
[17:40] <Lunar_Lander__> I don't remember the value but I think it is inaccessible to balloons, then the pressure will jump back to 200000 pascals
[17:41] <bertrik> Lunar_Lander__: ok thanks, I was just reading this https://www.sparkfun.com/tutorials/185 where they still get readings above 9 km, I just wonder how accurate they still are
[17:41] <bertrik> Could the jumping back be some kind of numerical overflow?
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[17:46] <Lunar_Lander__> I think somone said that here last week
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[17:46] <Lunar_Lander__> SP9UOB_Tom said it in fact
[17:46] <Lunar_Lander__> bertrik, I did a curve of the error for the measurement range I could achieve, the error follows about an exponential decay of the 2nd order
[17:47] <Lunar_Lander__> the error is about 500 Pascals at the lowest pressures in the test
[17:47] <Lunar_Lander__> so around 30 km
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[17:49] <Lunar_Lander__> bertrik, http://s.gullipics.com/image/9/7/0/5yvere-kp6kbt-nwld/Bildschirmfotovom20130512194819.png
[17:50] <bertrik> nice
[17:51] <bertrik> so this is the error of the BMP-085 vs. some kind of calibrated pressure sensor?
[17:52] <Lunar_Lander__> yes, the pressure sensor of the vacuum pump
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[17:56] <Lunar_Lander__> bertrik, i.e. that plot gives you the error for a certain pressure indication of the BMP085
[17:56] <Lunar_Lander__> the pressure is on the x-axis
[17:56] <Lunar_Lander__> the difference between BMP085 and pump sensor is on the y-axis
[17:56] <Lunar_Lander__> so you can read what you need to substract from your reading
[17:57] <x-f> Lunar_Lander__, was the temperature constant on your vacuum test?
[17:58] <Lunar_Lander__> yes
[17:59] Nick change: ghoti_ -> ghoti
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[18:00] <bertrik> Lunar_Lander__: but, wouldn't you have to create this curve for each specific sensor?
[18:01] <bertrik> So I'm worried that curve might not apply for my particular BMP-085
[18:01] <Lunar_Lander__> that is true
[18:01] <Lunar_Lander__> but it is a rough idea
[18:02] <x-f> Radim's STS-1 flew the BMP085 along with a proper meteosonde, a few graphs with comparison - http://stsproject.net/?p=368
[18:03] <bertrik> x-f: interesting
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[18:04] <bertrik> still pretty good up to 15 km, without any correction
[18:04] <x-f> didn't know their balloon was photographed from the ground while it was at 33 km altitude :) - http://stsproject.net/wp-content/uploads/2012/09/209241_4248430621485_754736898_o.jpg
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[18:12] <SpeedEvil> someone got a picture of a burst
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[18:55] <arko> http://vimeo.com/65475425#
[18:55] <Lunar_Lander__> Upu, got a short question
[18:56] <fsphil> 5mm?
[19:01] <cm13g09> fsphil lol
[19:09] <daveake> perhaps it's in a really tiny font
[19:11] <Lunar_Lander__> xD
[19:15] <Lunar_Lander__> I wanted to know if it is OK to use the product photo of the sarantel GPS from his site in my report
[19:18] Action: fsphil measures
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[19:18] <Lunar_Lander__> hi S_Mark
[19:18] <fsphil> on my screen that's about 250mm x 15mm
[19:19] <S_Mark> Hello Lunar
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[19:30] <chrisstubbs> S_Mark saw your photo of the temp. sensors earlier
[19:30] <chrisstubbs> hows it going?
[19:33] <S_Mark> Ah yeah all good, got them working thanks
[19:33] <S_Mark> Need to integrate now
[19:33] <S_Mark> all addressable off one pin which is nice
[19:33] <chrisstubbs> neat
[19:34] <chrisstubbs> whats up with your arduinous usb cable in that pic btw?
[19:35] <chrisstubbs> haha just had a good excuse for not commenting my code, the keyboard I was using didnt have a # key
[19:35] <S_Mark> how do you mean
[19:36] <S_Mark> Oh that silver thing
[19:36] <chrisstubbs> No its like heatshinked/taped onto the uno
[19:37] <S_Mark> Ahh, that is just electrical tape
[19:37] <S_Mark> preventing short
[19:37] <S_Mark> s
[19:37] <Lunar_Lander__> which ones do you use?
[19:37] <chrisstubbs> Oh! from the perspective it looked like you removed the USB plug and soldered the cable striaght onto the board then heatshrinked it
[19:38] <chrisstubbs> reflection of the pcb on the usb port got me :P
[19:38] <S_Mark> ah lol
[19:45] Nick change: zarya_ -> zarya
[19:48] <chris_99> has anyone heard of the idea of an orbital airship?
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[19:56] <SpeedEvil> yes
[19:56] <SpeedEvil> it's put forward by a team that should really know better
[19:56] <SpeedEvil> I suspect not reviewed by anyone with a clue.
[19:57] <SpeedEvil> assuming you're meaning the insane idea of an ion drive high l/d hypersonic airship.
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[20:05] <chris_99> yeah that sounds like the one SpeedEvil, the JP Aerospace one
[20:06] <SpeedEvil> I mean, if hypersonic low drag aerofoils actually worked, there would be all sorts of interesting apps
[20:06] <SpeedEvil> for example, you could do really funky aero capture with them
[20:06] <chris_99> what do you think the main problems with them are
[20:08] <Lunar_Lander__> you can't build them probably
[20:08] <SpeedEvil> quite
[20:09] <SpeedEvil> they seem counter to all knowledge of hypersonic flight,
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[20:09] <chris_99> would they get ripped apart or somthing
[20:09] <SpeedEvil> you basically need to exceed the state of the art by about four or five orders of magnitude
[20:09] <SpeedEvil> maybe more
[20:11] <Lunar_Lander__> S_Mark, can you link me to a photo of your temp sensors?
[20:11] <Upu> no problems Lunar_Lander use them as needed
[20:12] <S_Mark> https://twitter.com/stratodean
[20:12] <chris_99> ah is that a ds18 sensor S_Mark
[20:12] <S_Mark> yes
[20:12] <S_Mark> Only just started looking it it toda
[20:12] <S_Mark> y
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[20:13] <Lunar_Lander__> yea
[20:13] <Lunar_Lander__> I think these need their 4.7k pullups though
[20:14] <S_Mark> Yeah only one though
[20:14] <Lunar_Lander__> yea
[20:14] <chris_99> don't spose anyones used one of those with a PIC per chance?
[20:14] <Lunar_Lander__> protect them from the sun :)
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[20:25] <chrisstubbs> Today I went to the local aerodrome and made a shocking discovery
[20:26] <chrisstubbs> it turns out pilots actually enjoy flying into balloons: http://flic.kr/p/eiHhX1
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[20:28] <arko> oh
[20:28] <arko> yeah
[20:29] <arko> when i was working on my pilots license my flight instructor told me how much he enjoys finding balloons, chasing them down and popping them
[20:29] <arko> it's a thing
[20:29] <bertrik> small balloons I suppose
[20:30] <chrisstubbs> yeah these stunt planes were tiny
[20:30] <chrisstubbs> "the turbulents" the display team was called
[20:30] <chris_99> haha interesting piccy
[20:34] <chrisstubbs> they had some 1/3 scale RC planes there too
[20:34] <chrisstubbs> WW1 planes at scale speed proved for a boring display though :P
[20:41] <arko> http://zenpencils.com/comic/106-chris-hadfield-an-astronauts-advice/
[20:45] <Lunar_Lander__> zenpencils rocks!
[20:45] <Lunar_Lander__> I got the one about feynman not knowing is more interesting than guessing or so in the uni office :)
[20:46] <fsphil> that sentence doesn't parse well
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[20:54] <Lunar_Lander__> yea
[20:54] <S_Mark> The story of Feynman is on BBC2 in the UK right now!
[20:56] <Lunar_Lander__> cool!
[20:56] <Lunar_Lander__> what's the title of the show?
[20:56] <Lunar_Lander__> no ordinary genius?
[20:57] <S_Mark> The Fantastic Mr Feynman
[20:57] <Lunar_Lander__> thanks :)
[20:57] <S_Mark> np
[20:58] <arko> its unfortunate he's dead
[20:58] <arko> i really wish i could have met him
[20:58] <Lunar_Lander__> yea
[20:58] <Lunar_Lander__> yea it's 25 years that he is dead now
[20:58] <arko> although, meeting his sister was mind blowing
[20:58] <Lunar_Lander__> he died like in Feb. 88
[20:58] <arko> she talks and looks like him
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[20:58] <Lunar_Lander__> I was born Dec. 89
[20:58] <Lunar_Lander__> arko, cool does she still live and work?
[20:58] <S_Mark> She is on the prog
[20:58] <arko> yeah
[20:59] <arko> she works at jpl
[20:59] <Lunar_Lander__> awesome
[20:59] <Lunar_Lander__> what does she do?
[20:59] <arko> climate research
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[20:59] <arko> i visited her once
[20:59] <Lunar_Lander__> cool
[20:59] <arko> she gave me her paper and we talked about it and feynman
[20:59] <Lunar_Lander__> yeah
[21:00] <Lunar_Lander__> xD his radio show for her when she was 3
[21:00] <Lunar_Lander__> XD
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[21:01] <arko> http://i.imgur.com/DCyNf.jpg
[21:01] <arko> there we go
[21:01] <arko> that took a bit to find
[21:02] <arko> she's tiny
[21:02] <Lunar_Lander__> cool!
[21:02] <Lunar_Lander__> what does she think about stratosphere balloons?
[21:02] <Lunar_Lander__> WOW if you look at her face closely
[21:02] <Lunar_Lander__> yeah
[21:02] <Lunar_Lander__> no doubt
[21:02] <Lunar_Lander__> xD
[21:02] <arko> same exact accent
[21:03] <arko> it was so weird
[21:03] <Lunar_Lander__> yeah
[21:03] <Lunar_Lander__> what does she think about stratosphere balloons?
[21:04] <arko> dunno
[21:04] <arko> never asked
[21:04] <arko> this was 3 years ago
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[21:06] <Lunar_Lander__> oh
[21:06] <Lunar_Lander__> is she still there?
[21:06] <arko> yes
[21:08] <Lunar_Lander__> cool!
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[22:01] <jarod> http://www.ebay.com/itm/MINI-FM-DAB-DVB-T-SDR-Dongle-STICK-RTL2832U-R820T-Antenna-for-LINUX-/230979961206?pt=US_Video_Capture_TV_Tuner_Cards&hash=item35c77a8176 - MINI FM+DAB+DVB-T+SDR Dongle STICK RTL2832U+R820T Antenna for LINUX - newly listed = $14,99 (They upped the price, new seller)
[22:02] <Upu-> did you ever get your preamp jarod ?
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[22:03] <jarod> They called it the MINI .... np for introducing it :D
[22:03] <jarod> Upu- yup .... it worked way too well.... the rtlsdr mini requires no lna
[22:04] <Upu-> which amp was it ?
[22:04] <Upu-> Because I made this : http://imgur.com/a/yyfXV
[22:04] <Upu-> which has a SAW in too
[22:15] Nick change: Arbition_ -> Arbition
[22:19] <jarod> he got two, one has been returned.... its wideband, but works way too well..... i just dont have any low signals it can work with
[22:21] <Gadget-Mac> Upu-: Oh, a 1090 version ?
[22:21] <Upu-> yup
[22:21] <Upu-> and 868Mhz
[22:22] Nick change: Upu- -> Upu
[22:22] <Upu> right I'm off night all
[22:22] <Gadget-Mac> Upu: Catch you tomorrow :)
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[00:00] --- Mon May 13 2013