highaltitude.log.20100526

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[03:18] <jiffe99> anyone use a beacon transmitter or anything similar for tracking balloons?
[03:18] <SpeedEvil> There have been people adding beacons too.
[03:18] <SpeedEvil> Mostly as backup for the GPS/data.
[03:19] <jiffe99> yeah thats what I was thinking
[03:19] <SpeedEvil> Slightly differnet freq - 555 - ...
[03:22] <jiffe99> 555 mhz?
[03:27] <SpeedEvil> no - a 555 chip to turn the transmitter on and off, to make a predictable apttern, so you can tell you're recieving it
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[04:09] <jshriver> Think I'm going to end up using aprs with a TinyTrak for my setup. Kinda expensive but worth it if I can recover my package.
[04:09] <jshriver> aprs is pretty well spread out here in the US so shouldn't be a problem finding a digipeater
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[05:18] Action: ball ponders
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[15:31] Nick change: ball -> L6ee
[15:31] Nick change: L6ee -> ball
[15:40] Nick change: ball -> ba11
[15:41] Nick change: ba11 -> ball
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[15:49] <jshriver> How is everyone today?
[15:49] <jcoxon> hi jshriver
[15:49] <jcoxon> good thanks
[15:49] <jcoxon> how are you?
[15:50] <jshriver> good a bit sleepy but good :)
[15:50] <jcoxon> :-)
[15:50] <jshriver> have a job, healthy body, and the sun is out can't complain lol
[15:50] <jcoxon> good good
[15:50] <jcoxon> you in the states?
[15:50] <jshriver> yup
[15:50] <jshriver> <--- Yank :)
[15:51] <jcoxon> well welcome to #highaltitude
[15:51] <jshriver> ty, found this gem on the net a couple days ago.
[15:51] <jcoxon> i think the timezones drive some of the yanks away
[15:51] <jcoxon> its been quiet here for hte last few weeks - lots of people have exams etc
[15:52] <jshriver> when is a good time to chat here GMT? I think England is +8hrs from eastern US
[15:52] <jshriver> aye
[15:53] <jshriver> have you done a flight before?
[15:53] <russss> UK is +5 hours from eastern and +8 hours from pacific
[15:53] <jcoxon> jshriver, yes many flights
[15:54] <jshriver> nice :) have a website or pics? HAB fascinate me. Saw a post on digg.com a while back and was hooked.
[15:54] <jcoxon> jshriver, the best time really varies - depends on if launches are taking place
[15:54] <jcoxon> jshriver, http://www.pegasushabproject.org.uk
[15:54] <jshriver> thanks for sharing
[15:55] <jshriver> Where do you hail from?
[15:55] <ball> I wish I could get my radio-controlled clock to work in GMT
[15:55] Action: ball sighs
[15:55] <jshriver> jcoxon: good luck with the Atlantic Halo project. If you need someone on the east coast US I might be able to help retrieve.
[15:56] <jcoxon> jshriver, yeah its a challenge, enthusiasim varies a lot
[15:57] <jcoxon> hopefully will get restarted in a few weeks when peoples commitments are complete
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[18:46] <rjharrison> Hi
[18:52] <stilldavid> hello
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[19:40] <jiffe> http://fmtv.us/rf_beacon.html
[19:40] <jiffe> I found that last night, it looks pretty interesting
[19:43] <DanielRichman> hmm I like the idea of reducing the power of the beeps
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[20:17] <RocketBoy> Anyone know of any planned launches comming up?
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[21:00] <stilldavid> so I went to the Maker Faire last weekend
[21:00] <stilldavid> It's just a bunch of nerds with projects that show off what they're working on
[21:00] <stilldavid> but there was a group from NASA showing off some cubesats and the like...
[21:01] <stilldavid> they also had on display a self-stabilizing payload which used 3 orthogonal gyros. it was pretty interesting
[21:01] <stilldavid> was wondering if anyone has looked into a similar system for stabilizing cameras on balloons and taking longer exposure star photos or anything
[21:02] <stilldavid> I think they were using these: http://gyroscope.com/d.asp?product=SUPER2
[21:02] <SpeedEvil> yes
[21:02] <SpeedEvil> edmoore was looking at momentum wheels.
[21:03] <stilldavid> are star photos even viable in the daylight if you point the camera in the right direction?
[21:03] <SpeedEvil> Of course.
[21:03] <SpeedEvil> If you're up high enough
[21:03] <SpeedEvil> You can actually see stars in daylight anyway - with a high enough res camera system.
[21:04] <SpeedEvil> It's just the background light means you generally need to know just where to look
[21:04] <stilldavid> Yeah, that's what I'm thinking. these gyros are heavy (350g) but it would be cool to get to ~25km and start up the gyros
[21:04] <stilldavid> aka "not the sun"
[21:04] <SpeedEvil> There isn't really a good reason to use ones that heavy
[21:04] <stilldavid> yeah, but I like the precision in the manufacturing. know anything else that's lighter?
[21:05] <stilldavid> with HE motors attatched, preferrable
[21:08] <SpeedEvil> http://cgi.ebay.co.uk/Emax-29g-Brushless-Outrunner-CF2822-x1-/120462710842?cmd=ViewItem&pt=UK_ToysGames_RadioControlled_JN&hash=item1c0c23183a
[21:09] <stilldavid> I might be able to get access to a lathe, I guess... combine that with a few brushless motors and I'm in business I guess
[21:10] <stilldavid> would probably be more fun, as well.
[21:10] <SpeedEvil> Will fundamentally work. You will need to attach a flywheel possibly, though the motor has a fair bit of inertia on its own.
[21:10] <SpeedEvil> Basically - it's probably most sane to have a rough stabilisation stage that takes you to - say - +-5 degrees, and a nice tight loop inside that
[21:11] <stilldavid> yeah, that's what I'm thinking. machine a flywheel out of aluminum
[21:11] <stilldavid> how do you mean, a rough stabilisation stage?
[21:12] <stilldavid> get the payload balanced, then fire everything up?
[21:12] <SpeedEvil> no
[21:12] <SpeedEvil> the gyros do not handle the fine pointing
[21:12] <stilldavid> okay...
[21:12] <stilldavid> I'm thinking stepper motors with a bit of gear reduction
[21:12] <stilldavid> and what will most likely be an incredibly heavy payload
[21:15] <jcoxon> evening all
[21:21] <stilldavid> I remember seeing this: http://www.youtube.com/watch?v=gdAmEEAiJWo
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[22:23] <SpeedEvil> stilldavid: you need fairly rapid response - which is a problem
[22:24] <stilldavid> how rapid? like, thousands of herts?
[22:25] <stilldavid> s/s/z/
[22:25] <SpeedEvil> no - probably only a few Hz
[22:25] <SpeedEvil> But steppers can be problematic
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[22:26] <stilldavid> I played with servos a long time ago for this kind of thing
[22:27] <stilldavid> http://www.youtube.com/watch?v=uCh6XtWDfoY
[22:28] <SpeedEvil> It really depends what sort of precision you want
[22:28] <SpeedEvil> If you want sub-pixel pointing for seconds - it gets hard
[22:32] <jcoxon> wow compiling the build environment for gumstix takes soooo long
[22:32] <jcoxon> especially using an ubuntu in virtualbox
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[22:35] <DanielRichman> how close to native does virtualbox get?
[22:35] <DanielRichman> if your cpu supports it kvm is much nicer
[22:35] <jcoxon> its pretty good
[22:35] <DanielRichman> is the build spitting a lot of text to a console?
[22:35] <jcoxon> its more having to compile everything such as glibc and gcc
[22:36] <DanielRichman> mmm sounds fun that
[22:36] <jcoxon> yeah
[22:36] <DanielRichman> iirc glibc takes *ages*
[22:36] <jcoxon> oh i've done this many times before
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[22:36] <jcoxon> gumstix is now a mess - they used to be well documented
[22:40] <Randomskk> unusual direction
[22:41] <jcoxon> well they add features, rely on users to document but then no one does
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[22:41] <Randomskk> ah
[22:41] <jcoxon> i worked hard on their old wiki
[22:41] <jcoxon> but its no out of date it seems
[22:41] <jcoxon> of well
[22:42] <jcoxon> oh well*
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[00:00] --- Thu May 27 2010