highaltitude.log.20090815

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[02:02] <SpeedEvil> http://img.4chan.org/b/thumb/1250297842654s.jpg :)
[02:02] <SpeedEvil> (worksafe)
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[13:19] <cuddykid> Hi everyone! I have a question!! Can you just feed the output from an arduino serial tx (through the right resistors etc) into the rx of the NTX2 Radio and will it output it correct?
[13:25] <cuddykid> does anyone know :S ?!!
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[13:29] <SpeedEvil> yes
[13:29] <SpeedEvil> basically
[13:31] <SpeedEvil> The resistors need to alter the voltage swing so that it's about 0.2V (IIRC) - if you don't care about being able to tune it - then a couple of resistors works.
[13:31] <SpeedEvil> otherwise you need at least 1, and a couple of pots
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[13:42] <cuddykid> Many thanks SpeedEvil
[13:42] <SpeedEvil> do you have a radio?
[13:42] <cuddykid> yes
[13:42] <cuddykid> Yaesu FT-817
[13:43] <cuddykid> but haven't got the NTX2 yet
[13:43] <rjharrison_home> cuddykid there is a sample circuit here http://www.robertharrison.org/images/icarus2/Icarus-sch.pdf
[13:43] <rjharrison_home> cuddykid Nice radio
[13:43] <cuddykid> thanks
[13:43] <rjharrison_home> Perfect for this kind of project
[13:45] <SpeedEvil> that's not UART based though?
[13:45] <cuddykid> on the link you just sent me - you see that both pin 26 & 27 lead into the tx on the radio. Would the serial output (just 1 pin) replace both these pins?
[13:45] <SpeedEvil> As simplest - you can just use a 470R to ground, then a 12K to the UART
[13:51] <cuddykid> thanks
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[14:31] <SpeedEvil> Lucky bastard. http://news.bbc.co.uk/1/hi/england/shropshire/8202628.stm
[14:38] <gordonjcp> eep
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[18:51] <SpikeUK> SpeedEvil ping
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[18:52] <SpeedEvil> ong
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[18:54] <SpikeUK> Hi! Thanks for coming back! I'm trying to get fldgi worging using the instructions and audio recording on http://wiki.ukhas.org.uk/guides:tracking_guide - I think you added most of it. Right?
[18:54] <SpeedEvil> I added most of the theory section - jcoxon added most of the fldigi stuff
[18:55] <SpeedEvil> I've used fldigi once or twice - but never installed it
[18:56] <SpikeUK> SpeedEvil - thanks! I've installed it fine, but can not get it to decode the .ogg file - any clues please?
[18:56] <SpeedEvil> what ogg?
[18:56] <SpeedEvil> Oh - that was just an examlpe file I pulled from wikipedia.
[18:57] <SpeedEvil> It's not in the same format as the balloon transmissions.
[18:57] <SpeedEvil> http://en.wikipedia.org/wiki/File:RTTY.ogg - you'd need to setup fldigi to recieve ' 45.45 baud, central frequency 1000 Hz, shift 170 Hz, 5 data bits (Baudot), no parity, 1.5 stop bits.'
[18:57] <SpeedEvil> or similar
[18:58] <SpikeUK> D'oh! I've spent the last two hours on this! That would explain it then. Thanks! - I''l be back later
[18:59] <SpeedEvil> Sorry :)
[18:59] <SpeedEvil> I'd intended that to just be 'sounds about right' - which it will
[18:59] <SpikeUK> No problems. I'm sure the hair will grow back ;-)
[18:59] <SpeedEvil> I wasn't expecting anyone to try to decode it! :)
[19:00] <SpikeUK> I wanted to make sure that I knew what to do when there is a real launch...
[19:01] <SpeedEvil> There should ideally be some recording someones made of a launch.
[19:01] <SpeedEvil> But I don't know of any.
[19:01] Action: SpeedEvil pokes rjharrison_home - do you have any?
[19:01] <SpikeUK> Thanks guys- bbl!
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[19:16] <rjharrison_home> SpeedEvil: I'll post a sample rtty file for icarus
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[19:17] <SpeedEvil> :) Page is shaping up OK
[19:23] <rjharrison_home> SpeedEvil Yep I have some spamle rtty around
[19:23] <rjharrison_home> Can I post some later
[19:24] <rjharrison_home> if anyone sees daniel rackman please ask him to send me his email address to rharrisonathgf.com
[19:29] <SpeedEvil> y
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[20:11] <Hiena> Hmmm...Anybody knows, how to calculate the muzzle energy through the barrel lenght?
[20:11] <SpeedEvil> of?
[20:13] <Hiena> I means, i know the total effective lenght of the barrel and the input power.
[20:14] <SpeedEvil> of a normal explosive powered firearm?
[20:17] <Hiena> Nope.
[20:18] <Hiena> Coilgun launching modells.
[20:20] <SpeedEvil> ah
[20:22] <SpeedEvil> To actually come out with an analytical answer - you need to do _hideously_ complex electromagnetic simulations.
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[20:35] <DanielRichman> ping rjharrison_home
[20:40] <SpeedEvil> rjharrison_home: if anyone sees daniel rackman please ask him to send me his email address to rharrisonathgf.com
[20:44] <DanielRichman> thanks
[20:44] <SpeedEvil> np
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[21:05] <rjharrison_home> hey DanielRichman
[21:06] <rjharrison_home> PING
[21:11] <DanielRichman> PONG
[21:11] <DanielRichman> rjharrison_home, !
[21:11] <rjharrison_home> PM
[21:12] <DanielRichman> k
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[22:07] <natrium42> yo Xenion
[22:07] <Xenion> Hello everyone :-)
[22:07] <Xenion> hi natrium42 !!
[22:07] <Xenion> :-)
[22:08] <natrium42> alles roger? :)
[22:08] <Xenion> nicht ganz :-D
[22:08] <Xenion> query?
[22:09] <natrium42> warum nicht ganz?
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[22:10] <DanielRichman> wer ist nicht roger?
[22:11] <natrium42> roger federer hat verloren :(
[22:14] <DanielRichman> was hat roger verloren?
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[22:19] <natrium42> einen match gegen Tsonga
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[22:23] <DanielRichman> warum hat er verloren?
[22:25] <natrium42> ka
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[22:38] <natrium42> hi RocketBoy
[22:39] <natrium42> any cool refrigeration news?
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[23:06] <RocketBoy> natrium42 - no not yet - I have to re-arrange the workshop to work on the freezer - It'll take a day or 2
[23:07] <natrium42> kk
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[23:37] <Xenion> http://xkcd.com/212/ <- :-)
[23:37] <Laurenceb> hi
[23:37] <Xenion> good night folks
[23:39] <Laurenceb> edmoore: the cc1111, how do you generate RTTY?
[23:39] <Laurenceb> I red through the datasheet and you seem to be limited in baud rate
[23:39] <Laurenceb> are you sending no data and resetting the carrier frequency?
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[23:41] <Laurenceb> doh
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[23:52] <Laurenceb> SpeedEvil: ping
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[23:52] <SpeedEvil> ?
[23:53] <Laurenceb> yo
[23:53] <Laurenceb> I was looking at brushless controllers
[23:53] <Laurenceb> looks like you can control two motors with one micro fairly easily
[23:53] <SpeedEvil> just timeslicing?
[23:53] <Laurenceb> I've got my n-prize design down to about £200 for the rocket and 300 for the entire launch
[23:53] <SpeedEvil> one big dumb loop?
[23:54] <SpeedEvil> neat!
[23:54] <Laurenceb> erm a timer interrupt for setting the H bridges
[23:54] <SpeedEvil> ah
[23:54] <Laurenceb> and a loop that works out what to tell the isr to do next
[23:55] <Laurenceb> so theres some basic hardware with a little lipo, two motors and a single micro in the second stage nozzle
[23:55] <Laurenceb> with two thermopiles and a photodiode to detect attitude
[23:55] <Xenion> Laurenceb, you in for the n-prize ?
[23:55] <Laurenceb> that reorientates the second stage spin axis after seperation
[23:55] <Laurenceb> I was working on some designs
[23:56] <Laurenceb> at the least I think I've got something thats easy to make to reach 100km
[23:56] <Laurenceb> one thing I'm not sure about is heating of the fairing during ascent
[23:57] <SpeedEvil> You point roughly - say within a few degrees on staging - then trim ?
[23:57] <Laurenceb> no
[23:57] <Laurenceb> the first stage goes up at ~45 degrees to vertical
[23:57] <Laurenceb> ~ +-3 degrees
[23:58] <Laurenceb> then the second stage is rotated round to horizontal and ignited
[23:58] <Laurenceb> at a few seconds before apogee
[23:58] <SpeedEvil> ah
[23:58] <SpeedEvil> so it's a major trim
[23:58] <Laurenceb> resulting in an elliptical orbit
[23:58] <Laurenceb> depending on motor performance
[23:58] <Xenion> Laurenceb, good luck for this one
[23:59] <SpeedEvil> how do you work out apogee? Ground?
[23:59] <Laurenceb> yeah
[23:59] <Xenion> i've got an interview regarding the n-prize 2 weeks ago
[23:59] <Xenion> :-)
[23:59] <Laurenceb> interview?
[23:59] <Xenion> it was quit interesting
[23:59] <Laurenceb> you do curve fitting to the doppler curve on a pc on the ground
[23:59] <Xenion> Laurenceb, i've did an interview about my team for the glxp and i was asked about the n-prize
[00:00] --- Sun Aug 16 2009