highaltitude.log.20100525

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[00:17] <fsphil> quick as a rocket that one
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[13:19] <DanielRichman> Intermediate license; job done
[13:28] <GW8RAK> Well done
[13:38] <G8TMV> congrats - got a callsign yet?
[13:42] <DanielRichman> nah; Ofcom haven't opened their mail yet it'd seem
[13:48] <G8TMV> have you asked for anything in particular?
[13:50] <DanielRichman> oh no, I mean the mail from the RSGB to Ofcom
[13:50] <DanielRichman> then I can do it online
[13:50] <DanielRichman> haven't thought about it yet.
[13:50] <G8TMV> do you have a foundation one?
[13:51] <G8TMV> I knew someone who was G8KGB and after he got his morse he became G4CIA
[13:51] <DanielRichman> :P
[13:52] <DanielRichman> Did he keep the old one? 'Cause I gather even if I get a 2E0 I can still use M6DRX; power providing
[13:52] <G8TMV> No, you were only allowed to hold one (personal) call back then
[13:53] <G8TMV> is 2E0DRX avail?
[13:55] <G8TMV> In some ways I'm glad I never did the morse test, since I quite like G8TMV
[13:56] <G8TMV> of course now I don't need cw for the HF bands I'm learning it anyway
[13:56] <DanielRichman> I see. I don't know if it's available
[13:57] <DanielRichman> I can't look until my candidate number is passed from the RSGB to ofcom
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[15:11] <DanielRichman> Soldering SMDs by hand? how easy is it? What about something like the xmega128a1 (:D) for someone who's never soldered smd before ?
[15:12] <G8TMV> depends on the pin pitch
[15:12] <m0tek> you have young eyes it'll be fine
[15:12] <G8TMV> also if it's a bga then you can't do it by hand (well not with a soldering iron anyway)
[15:12] <m0tek> but a non-crap iron makes the difference
[15:12] <DanielRichman> it's a TQFP100
[15:12] <m0tek> easy
[15:13] <DanielRichman> How do you do it?
[15:13] <DanielRichman> it looks totally impossible
[15:13] <m0tek> you can either solder each pin individually with care
[15:13] <m0tek> but life is short
[15:13] <m0tek> so get yourself a flex pen
[15:13] <m0tek> flux really is your friend, use it liberally
[15:13] <m0tek> then charge the tip of your iron with a fair bit of solder
[15:14] <m0tek> and run it along a well fluxed row of pins
[15:14] <m0tek> having tacking the corner pins into place i should add
[15:14] <m0tek> tacked*
[15:14] <m0tek> then use some solder braid to suck up any bridges you might have made
[15:14] <m0tek> give it a go, I've been doing it for yonks, it's really not as hard as you might think
[15:14] <DanielRichman> hmm so basically I'd need to order like 5 xmega128a1s for the times I mess it up
[15:15] <DanielRichman> m0tek, OK, cool, thank you :)
[15:15] <m0tek> I've soldered some 0.5mm pitch QFN packages before, - that started to get pretty challenging. but if the leads are visible to the eye you shouldn't have a problem
[15:16] <m0tek> you could also try getting a toaster over for £20 from argos and using solder paste and sticking the whole thing in the oven
[15:16] <DanielRichman> reflow style?
[15:16] <G8TMV> I know someone who uses solder paste and then puts the board in a clean cast iron skillet on the hob
[15:16] <m0tek> preheat to 100-150 degrees c, leave it in there for two or three minutes, then turn up to 250 degrees until you see it reflow. give it a gentle tap as you do so which helps everything get aligned by the solder surface tension
[15:17] <m0tek> then turn it back down to 150 degrees and leave it for a few minutes, then turn it off
[15:17] <DanielRichman> toaster at @250 degrees C?
[15:17] <m0tek> the reason for this 'pre-heating' is that there's a chance if you put it straught into a 250 degree oven it'll get upset as it expands too quickly. although i know people who do that without issue
[15:17] <G8TMV> toaster oven - ie a small oven
[15:18] <DanielRichman> ah, I see
[15:18] <m0tek> badger 2 was done in the oven
[15:18] <m0tek> it cost us £19.99
[15:18] <SpeedEvil> G8TMV: That's a really bad idea.
[15:19] <SpeedEvil> G8TMV: Peanut oil will vastly improve the heat transfer.
[15:19] <G8TMV> SpeedEvil: maybe - it was a yank rocket maker who did it
[15:19] <m0tek> i'm not such a fan of reflow oven just because i think ir is slightly nicer than having a really hot contact surface on the bottom and then exposure to cool air above
[15:19] <DanielRichman> m0tek, OK. I'm thinking the xmega128a1 because I need an absolute tonne of USARTs. Asides from software serial, is there a better way to get loads of usarts in a DIL way?
[15:19] <DanielRichman> most of the DIL megas have 1 or 2
[15:19] <m0tek> aaaaaaaaaaaaargh DIL
[15:20] <m0tek> probably not. DIL40 is about as big as it gets and as you know, 40 pins is not many
[15:20] <DanielRichman> hmmm OK
[15:20] <m0tek> but be brave with SMD, its bark really is a lot worse than its bite
[15:20] <m0tek> i'd even go so far as to say it's easier
[15:20] <SpeedEvil> In some ways.
[15:21] <m0tek> especially with an oven
[15:21] <SpeedEvil> Drilling holes in PCBs --
[15:21] <m0tek> exactly
[15:21] <m0tek> gah I really should be working
[15:22] <DanielRichman> sorry :P
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[15:52] <DanielRichman> "Each DAC has one continuous output with high drive capabilities for both resistive and capacitive loads.": Therefore not requiring an Op Amp voltage buffer like the Max541 DAC does?
[15:52] <DanielRichman> (quote from atxmega16a4a)
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[16:50] <jshriver> good morning everyone
[16:50] <jshriver> hope everyone is well
[16:58] <SpeedEvil> http://science.slashdot.org/story/10/05/25/150244/Airship-Inflated-To-Create-Monster-Stratellite
[16:59] <jshriver> woot /. :)
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[17:03] <jshriver> 6km really isn't that high. Don't most commercial planes go at least 9144m?
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[19:39] <Lunar_Lander> hello
[19:49] <jshriver> hi
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[20:04] <Lunar_Lander> how's life?
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[20:04] <natrium42> moin
[20:05] <natrium42> alles krass oder was?
[20:05] <Lunar_Lander> yeah xD
[20:05] <Lunar_Lander> I only need the predictor to work
[20:05] <natrium42> the cusf one?
[20:05] <jshriver> is that english? :)
[20:05] <Lunar_Lander> yeah
[20:05] <Lunar_Lander> ah there it is :P
[20:05] <natrium42> street german
[20:05] <Lunar_Lander> you only have to wait
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[20:06] <natrium42> a wild jcoxon appears
[20:07] <jcoxon> indeed
[20:07] <Lunar_Lander> hi jcoxon
[20:07] <Lunar_Lander> just two more minutes :)
[20:08] <jshriver> anyone here know of any HAB groups in the USA?
[20:09] <natrium42> google arhab
[20:09] <natrium42> :)
[20:11] <jshriver> ty
[20:12] <jshriver> have wondered, the only reason a balloon can't get higher is the material eventually breaks right?
[20:13] <jshriver> why not create some sort of aluminum or foil like material that can expand.
[20:13] <jshriver> or even have multiple balloons. One mostly filled for the first stage of lift and the second that's partially filled but has a lot more room to expand for the second
[20:16] <Lunar_Lander> man, finally donw
[20:16] <Lunar_Lander> *done
[20:17] <jonsowman> m0tek: ..?
[20:17] <m0tek> fail
[20:17] <m0tek> ok that's a bit better
[20:17] <m0tek> jshriver, take a look at that
[20:17] <jonsowman> hahaa
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[20:18] <jshriver> ty
[20:18] <jonsowman> uttarakhand livestock development board hey
[20:18] <jshriver> lol saw that
[20:18] <jonsowman> m0tek: hows things?
[20:19] <m0tek> I have neaerly finished my degree
[20:19] <m0tek> only 5 pages to go
[20:19] <jonsowman> scary
[20:19] <jonsowman> going well?
[20:19] <m0tek> so far
[20:19] <jonsowman> the dissertation i mean
[20:19] <jonsowman> ah good
[20:19] <m0tek> could be a long night though
[20:19] <jshriver> wow flights that could last up to 100 days :)
[20:19] <jshriver> good luck m0tek
[20:19] <m0tek> thanks
[20:20] <Lunar_Lander> good luck from me too m0tek
[20:20] <Lunar_Lander> I got something for you all
[20:21] <Lunar_Lander> http://stratosphere.weebly.com/files.html
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[20:29] <Lunar_Lander> does the PDF work for you?
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[20:34] <cuddykid> Hi all, the kind people over at DPI have kindly donated a lassen iQ gps module to use in my payload. Very pleased! Are these easy to interface with arduino? Do I need a breakout board?
[20:34] <DanielRichman> you need the cable then it's super easy
[20:34] <DanielRichman> two pullups later and you've got 4800 (or 9600) serial rolling in
[20:34] <cuddykid> Brilliant!
[20:34] <cuddykid> Where would I get the cable from? DPI?
[20:35] <DanielRichman> yeah I requested a free sample but that takes ages
[20:35] <m0tek> cuddykid, a good gps, it served us well for nearly 13 flights.
[20:35] <cuddykid> Ok, thanks, who from? Trimble or dpi for the sample?
[20:35] <m0tek> and very easy to work with. you're in luck
[20:35] <DanielRichman> http://alienproject.wordpress.com/2009/04/15/workshop-15-picture-post/1-samtec-cable-arrive/
[20:36] <cuddykid> m0tek: Sounds good!
[20:36] <cuddykid> DanielRichman: Thanks, will take a look
[20:36] <DanielRichman> have a look through these photos m0tek http://alienproject.wordpress.com/2009/04/15/workshop-15-picture-post/
[20:36] <Lunar_Lander> jcoxon?
[20:37] <cuddykid> DanielRichman: Haha!
[20:37] <jshriver> nice what kind of camera is that?
[20:37] <jshriver> nvm found it
[20:38] <jshriver> look into gphoto nice piece of software that can be used to control a lot of cameras over USB. I was planning to go that route.
[20:38] <cuddykid> DanielRichman: Where did you get the cable from?
[20:39] <DanielRichman> some company that was a pain to use
[20:39] <m0tek> jshriver, they're good cameras. we took this with one: http://www.nivnac.co.uk/files/HAPSD_NOVA8/HAPS-D_pan1_quarter.jpg
[20:39] <DanielRichman> I'll find it later; brb
[20:39] <DanielRichman> I believe the part number is mentioned in the datasheet
[20:39] <cuddykid> Okay, thanks
[20:39] <DanielRichman> samtec is the cable company; look in the lassen iq datasheet
[20:39] <jshriver> still loading looks nice so far. Composite pic?
[20:39] <cuddykid> Thanks, will do
[20:40] <jshriver> man that's beautiful :) wonderful shot m0tek
[20:40] <Lunar_Lander> amazing yeah
[20:40] <Lunar_Lander> where is that m0tek?
[20:41] <jshriver> was it doing frame after frame while rotating? then composite the images together?
[20:41] <m0tek> Lunar_Lander, 30km above cambridge
[20:41] <m0tek> jshriver, yep
[20:41] <Lunar_Lander> nice
[20:42] <m0tek> launched before dawn to get the sun
[20:42] <jshriver> nice stitch work! never seen anything that quality that wasn't nasa :)
[20:42] <jshriver> thanks for sharing
[20:42] <jshriver> how many flights you have all done?
[20:43] <m0tek> wearing my cambridge uni spaceflight hat, about 20
[20:43] <m0tek> wearing my ukhas geek hat, about 40
[20:43] <natrium42> lolwat
[20:44] <m0tek> I have an unfair disadvantage in that I somewhat administer one of the main balloon launch sites in the uk, in Churchill College sports grounds
[20:46] <m0tek> so I get to do lots of launching
[20:46] <cuddykid> DanielRichman: Samtecs website isn't one of the best around! Was the delivery free with the sample?
[20:47] <m0tek> jshriver, the stitch work was by a guy called James Canvin, and nasa have is mars-rover stitches up on their wall. He's seriously pro.
[20:47] <m0tek> he very graciously had his way with one of our SD card dumps
[20:48] <DanielRichman> cuddykid, yeah I think so
[20:48] <jshriver> lol
[20:48] <natrium42> you can do it with kolor autopano pro, though :P
[20:48] <m0tek> true that
[20:51] <cuddykid> DanielRichman: Good! Thanks
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[21:06] <Lunar_Lander> http://stratosphere.weebly.com/uploads/2/8/2/9/2829023/paper_1_balloon_calculations.pdf
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[21:15] <Lunar_Lander> Wb natrium42 and jcoxon_
[21:15] <m0tek> bbl
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[00:00] --- Wed May 26 2010