highaltitude.log.20100629

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[00:10] <griffonbot> @Daniel_Richman: Great #alienhab success! http://imgur.com/ydD8J.png #ukhas [http://twitter.com/Daniel_Richman/status/17286897265]
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[00:33] <DanielRichman> http://github.com/danielrichman/avr/blob/master/xplain-x128a1/dac_domex.c it now says "Greetings, human.\n". My work here is done; night
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[00:40] <SpeedEvil> http://news.bbc.co.uk/1/hi/sci/tech/8767763.stm - though I may have posted this before.
[00:40] Action: SpeedEvil has problems with his net connection.
[00:40] <SpeedEvil> Though I question the high spactial frequency stuff in there - it looks like over-enhancement
[00:41] <SpeedEvil> Thoguh I suppose on reflection, mid-ocrean ridges, and other crustal generators will indeed put out largely linear features
[00:46] <Laurenceb> SpeedEvil: yeah those ripples look suspicious
[00:46] <Laurenceb> like someone screwed up the data processing and exaggerated high spacial frequencies
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[08:43] <timbobel> hi all
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[09:34] #highaltitude: mode change '+o eroomde' by ChanServ!ChanServ@services.
[09:36] Topic changed on #highaltitude by eroomde!ed@88-202-209-83.rdns.as8401.net: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, LAUNCH: HelioSS 1 2009-06-30 1100hrs - dl-fldigi 'helioss' [434.650, 7n2, 50 baud, 425 shift]
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[10:47] <juxta> ping earthshine
[10:50] <timbobel> juxta hi
[10:50] <timbobel> how was sleep
[10:50] <juxta> hey timbobel
[10:50] <juxta> not enough of it, hehe
[10:50] <timbobel> hows the helical antenna
[10:51] <juxta> eh, one is not working. other one works fine though :)
[10:52] <juxta> I sent through your blog to that other guy in NL, Klaas
[10:55] <timbobel> okidoki
[10:55] <timbobel> weirdly enough the blog stats where spiking a bit yesterday
[10:56] <timbobel> whilst i hadnt posted anything new in 2 days.
[11:00] <timbobel> havent heared from him though
[11:01] <timbobel> other then a few listener-radio's i dont think im going to need more help until the launch
[11:02] <juxta> he mentioned he might be able to help with that
[11:02] <juxta> :)
[11:08] <earthshine> ji juxta
[11:08] <earthshine> hi
[11:08] <juxta> hey earthshine, got a sec?
[11:08] <earthshine> sure
[11:41] <eroomde> timbobel: could you link me to your blog?
[11:50] <eroomde> or juxta
[11:51] <juxta> eroomde: timbobel's blog is http://hollandshoogte.wordpress.com/, mine is http://projecthorus.org
[11:54] <eroomde> thanks juxta
[11:54] <DanielRichman> If I divide by 2 in C, is it guaranteed to always round down?
[11:56] <juxta> DanielRichman: yes, should always round down I believe
[11:56] <DanielRichman> awesome. I just saved 4 bytes
[11:56] <juxta> except for negative numbers perhaps - I believe it's 'round toward zero' technically
[11:57] <DanielRichman> ok
[11:57] <DanielRichman> won't gcc optimise a divide by 2 to a bit shift anyway?
[11:57] <eroomde> DanielRichman: aaaaaaaaaargh
[11:57] <eroomde> and yes it should if you have any optimisation on at all
[11:59] <eroomde> what cpu are you using DanielRichman ?
[11:59] <DanielRichman> that question was about the AVR; I'm using the xmega128a1 but on the final board will be using the xmega64a4
[12:02] <timbobel> blog: http://hollandshoogte.wordpress.com/
[12:04] <DanielRichman> how many people are going to kill me if I include this line in my code? data = *((uint16_t *) (varicode + ((c >> 1) * 3) + (c & 0x01)));
[12:05] <eroomde> just comment it well so some poor bugger knows that it is you are actually trying to do
[12:05] <DanielRichman> I was worried you were going to say that... /* Just trust me on this. */
[12:05] <DanielRichman> I'll add some proper commenting at the top
[12:08] <eroomde> maybe split it into lines and comment each. It's so worth it as trying to figure out what you did that was Very Clever (tm) 3 moths ago is so annoying.
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[13:01] <timbobel> am i wrong.. or.. do you actually have to pay $20 to use mIRC?
[13:08] <timbobel> i mean, come on, skype is free, youtube is free, but just saying a few lines in a textbox, unused since i last used it 10 years ago, suddenly costs $20!? come on.
[13:08] <russss> it's a voluntary registration fee.
[13:08] <timbobel> is it?
[13:08] <russss> oh, has it changed?
[13:08] <timbobel> brb
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[13:09] <timbobel> well it says im having a evaluation copy with 18 days remaining, they say before then i have to register. and that costs $20
[13:10] <russss> I think you will be able to skip the notice when it gets to 0 days remaining
[13:10] <russss> it's just nagware, and it's been like that for years
[13:11] <timbobel> ah allright. that's lame.
[13:11] <DanielRichman> xchat.
[13:11] <DanielRichman> http://www.silverex.org/
[13:11] <DanielRichman> also, here's a line from fldigi's dominoex:
[13:12] <DanielRichman> { 1,15, 0}, { 1,10, 0}, { 2, 9, 0}, { 0,10,12}, { 0, 9,14}, { 0,10,12},
[13:12] <DanielRichman> line twenty; note how the 4th (0x7b) and the last (0x7d) characters are the same :x
[13:15] <DanielRichman> looks like the mistake has been noticed before http://www.qsl.net/zl1bpu/MFSK/DominoEX%20Varicode%20Table.pdf
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[13:41] <DanielRichman> time to submit a bug report
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[14:10] <DanielRichman> eroomde, incase you ever go to use that domex code again, there's a bug in one of fldigi's tables that makes every 0x7b appear as a 0x7d ({, })
[14:11] <eroomde> DanielRichman: ta
[14:11] <eroomde> might be worth filing a bux with fldig
[14:11] <DanielRichman> I've submitted the bug report to the fldigi guys;
[14:11] <DanielRichman> http://github.com/danielrichman/avr/commit/6aefbce5d5e49628221d56fc00ace5f1a0726e0b
[14:12] <DanielRichman> and fixed it in my own code; but I'm not 100% sure if I've applied the fix correctly so I'll wait for them to get back to me
[14:13] <eroomde> cool
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[16:33] <eroomde> i will start diving into couchDB
[16:36] <eroomde> woah, totally wrong window.
[16:36] <eroomde> i will dive onto my couch for a snooze
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[17:04] Nick change: brennen|out -> brennen
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[19:30] Nick change: m0tek -> eroomde
[19:43] Nick change: RocketBoy -> YobTekcor|Away
[19:43] <fsphil> hmm.. is backwards the new forwards?
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[19:47] <jcoxon> evening all
[19:48] <fsphil> g'day
[19:48] <eroomde> hi jcoxon
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[19:49] <jcoxon> hey
[19:50] Action: jcoxon went to thorpe park today :-p
[19:50] <fsphil> yays
[19:51] <jcoxon> eroomde, will track tomorrow from london
[19:51] <eroomde> cool
[19:54] Action: fsphil has one of those annoying bugs that disappear, if you put in some code to help debug
[19:54] <jcoxon> fsphil, timing then?
[19:54] <fsphil> thinking that, or buffer overrun
[19:54] <fsphil> it's on the avr, when it's talking to the camera
[19:55] <jcoxon> i remember reading that the camera is notoriously fickle
[19:55] <fsphil> that is true
[19:56] <fsphil> the code I'm adding should take place after the problem happens though, the camera shouldn't be aware of it
[19:59] <jcoxon> strange
[19:59] <junderwood> is your compiler "optimising"
[19:59] <fsphil> hmm, -Os
[19:59] <junderwood> only for space
[20:00] <junderwood> not usually a problem
[20:00] <jcoxon> junderwood, just reading the wiki - good experiments
[20:00] <junderwood> -O3 causes all sorts of fun bugs
[20:00] <junderwood> jcoxon, thanks. None of my own work :)
[20:00] <junderwood> (well, not thinking of them anyway)
[20:01] <jcoxon> well i'd be interested in the results
[20:01] <junderwood> me too!
[20:01] <junderwood> I'll have to work out how to upload photos once we find it
[20:01] <jcoxon> photos to where?
[20:01] <junderwood> internet
[20:01] <jcoxon> flickr?
[20:02] <junderwood> something like that
[20:02] <jcoxon> i recommend flickr
[20:02] <junderwood> probably some on the school web site as well (but that's SEP)
[20:02] <jcoxon> the pro account is worth the money
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[20:20] <eroomde> agreed on pro-ness
[20:21] Nick change: YobTekcor|Away -> RocketBoy
[20:21] <eroomde> it's catching on
[20:22] <jcoxon> grrrr
[20:22] <fsphil> hmmm.. the mere presence of the debug code changes the behaviour -- regardless of it ever being called
[20:23] <RocketBoy> I'm expecting to launch a payload from EARS on Thursday for my local school - I expect to UStream the launch as usual
[20:23] <eroomde> cool
[20:23] <N900evil> good luck!
[20:23] <fsphil> sweet
[20:23] <RocketBoy> no tracking (its just a SMS based tracker)
[20:24] <jcoxon> can't stick a radio on it :-(
[20:24] <RocketBoy> crossed fingers job
[20:24] <eroomde> more pics from nova18 inc launch vid http://ukhas.org.uk/launch:170610nova18pegvii
[20:25] <eroomde> see the top of the flight images section
[20:25] <jcoxon> eroomde, i'll install a plugin to make flickr easier to work with on the wiki
[20:25] <eroomde> it's not too hard as it is
[20:25] <RocketBoy> jcoxon: its all their own work - I don't want to stick my nose in - I did suggest it in the past - but i think they wanted to do it all themselves
[20:25] <jcoxon> fair enough
[20:27] <RocketBoy> .
[20:28] Nick change: RocketBoy -> YobTekcor|Away
[20:31] <griffonbot> @apex_ii: Battery/power sponsorship confirmed from @batteryforce, many thanks to them! #apexhab #ukhas [http://twitter.com/apex_ii/status/17357769569]
[20:31] <eroomde> this is spam ^
[20:33] <jonsowman> :\
[20:34] <jcoxon> eroomde, grumpy!
[20:34] <eroomde> as always!
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[20:44] <jcoxon> hehe the US balloonist are so grumpy
[20:44] <jcoxon> any excuse to quote FCC regulations
[20:45] <jcoxon> (complaining about using GSM in payloads)
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[20:49] <fsphil> I removed all the debug code, and it's still working. still don't know what happened :)
[20:52] <DanielRichman> quick, sacrifice something to the gods
[21:00] <fsphil> two more changes, still working. yea do the gods of microprocessors do truly smile upon thine dodgy code
[21:03] <DanielRichman> speaking of dodgy, the slant of my SSTV changes depending on how many functions I call in the main loop :D
[21:03] <DanielRichman> being lazy with _delay_us is evil
[21:03] <fsphil> haha, but it works sorta
[21:13] <DanielRichman> yeah after I realised that qsstv just um... doesn't work :) atleast not on my box
[21:13] <DanielRichman> that was a bit frustrating
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[21:15] <fsphil> yep, it's a shame the only decent sstv decoder on linux is a windows app
[21:15] <DanielRichman> well atleast it means that I've got wine installed for two reasons now
[21:15] <DanielRichman> now... time to see if I can squeese a lolcat into the atmega's rom
[21:17] <jcoxon> DanielRichman, you seem to be motoring through your radio formats
[21:17] <DanielRichman> I think I'm only going to go for the big three; rtty domex and sstv
[21:18] <jcoxon> did you write the sstv from scratch?
[21:18] <DanielRichman> if you can call it "writing". it's a mess and I'll have to tidy it up
[21:19] <jcoxon> hehe
[21:19] <DanielRichman> TCD0.PER = 880;
[21:19] <DanielRichman> TCD0.CTRLA = TC_CLKSEL_DIV1_gc;
[21:19] <DanielRichman> and it slants to the left; TCD0.PER = 881 and it slants to the right :X
[21:19] <jcoxon> haha
[21:19] <DanielRichman> clock is only 2MHz; when I get the final board with an 8MHz one on it will be easier
[21:19] <jcoxon> eroomde, ping
[21:19] <DanielRichman> *actually* apparently these chips have a PLL inside them to boost the clockspeed to 48MHz or something crazy so that you can do super accurate waveform generation
[21:20] <fsphil> a slight slant should be fine as long as it's constant, the client can adjust
[21:20] <eroomde> jcoxon, pong
[21:20] <jcoxon> manual button? not sure what you mean
[21:21] <eroomde> to switch between modes
[21:21] <eroomde> rather than automatic scheduling
[21:21] <jcoxon> what version are you running?
[21:21] <eroomde> or rather aswel as
[21:23] <eroomde> the new one
[21:24] <jcoxon> did you compile it yourself or binary?
[21:24] <eroomde> although some creaky old one on my eeepc
[21:24] <eroomde> bin
[21:24] <jcoxon> fair enough
[21:24] <jcoxon> the latest has that button
[21:24] <eroomde> oh ok cool
[21:24] <jcoxon> dont' actually have automatic scheduling
[21:24] <jcoxon> :-p
[21:28] <jcoxon> got a few more changes then will roll a 112 binary
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[21:30] Nick change: YobTekcor|Away -> RocketBoy
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[21:31] <junderwood> evening SDGlynn
[21:31] <eroomde> could the names of the binarys stay the same each time?
[21:31] <SDGlynn> hi John
[21:31] <eroomde> so you can just drag a new one into your apps folder and have irt automatically replace the old one
[21:31] <junderwood> SDGlynn, ed is being a little backward this evening
[21:31] <eroomde> rather than accumulating a graveyard of deprecated versions as i am doing
[21:31] <jcoxon> eroomde, my thinking was yes apart from when they change the fldigi binary name
[21:32] <eroomde> most other apps still call themselves 'chrome' rather than 'chrome6.1.23.522'
[21:33] <jcoxon> its a good point
[21:46] <DanielRichman> http://imgur.com/SzrNU.png I'll go tick that one off
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[21:47] <fsphil> ah brilliant!
[21:47] <eroomde> good stuff!
[21:48] <eroomde> sstv on an avr is neat
[21:49] <fsphil> you're decoding the jpeg on the avr?
[21:50] <DanielRichman> fsphil, yeah I hope to. That smiley is a 32x24 bitmap that the avr resizes up to 320x240
[21:50] <DanielRichman> I'll have to look at the specifics of the camera but if I can I'll go for raw rather than jpeg
[21:51] <DanielRichman> provided it doesn't throw it at the avr too fast I can stream it out into the DAC without having to hold the whole thing in ram, which wouldn't be possible
[21:51] <eroomde> right, i am driving at 6 for tomorrow's escapades so i might go to bed
[21:51] <fsphil> the camera can send 16-bit raw data but it sents it all in one go -- you could control it by setting a lower baud rate though
[21:52] <DanielRichman> hmm a pixel lasts ~500 us, so the sstv output on the avr in theory can chew data at "8000baud"
[21:53] <eroomde> right
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[21:53] <eroomde> so the output filters on amateur radios are 3khz wide
[21:53] <DanielRichman> maybe I should put a dataflash on the board or something to hold the data while I deal with it
[21:54] <DanielRichman> or use the sd card for that purpose
[21:54] <eroomde> so you'll be wanting to do multiple bits per symbol and slow your baud rate down if you want 8000bps
[21:55] <DanielRichman> sorry, I mean that each pixel in sstv lasts .5ms; that's 8 bits in one go
[21:56] <eroomde> is this digital or analogue sstv?
[21:56] <DanielRichman> analogue; 0 = 1500Hz, 255 = 2300Hz
[21:56] <eroomde> h'ok
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[22:04] <rjharrison> ping junderwood
[22:04] <rjharrison> You launching tomorrow?
[22:05] <junderwood> rjharrison, that's the plan
[22:05] <junderwood> 11:00 am from Cambridge
[22:06] <rjharrison> junderwood Ok I need to polish the tracker for you
[22:06] <natrium42> junderwood, what's the predicted ascent/descent rates and burst alt?
[22:06] <junderwood> ascent, 4ish
[22:07] <rjharrison> I assume if it works with the audio you sent me then all is well!
[22:07] <junderwood> descent 6-7
[22:07] <junderwood> burst alt ~33
[22:07] <junderwood> It worked yesterday. Who knows tomorrow
[22:07] <jcoxon> rjharrison, i think i've set it all up
[22:08] <jcoxon> all thats left is the gfs data
[22:08] <rjharrison> jcoxon brillant
[22:08] <rjharrison> as you can see from 99 been a bit out of action
[22:08] <jcoxon> yeah
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[22:20] <DanielRichman> http://github.com/danielrichman/avr/blob/master/xplain-x128a1/dac_sstv.c
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[22:23] <jonsowman> what size of parachute do we generally use?
[22:24] <jonsowman> any guidelines on that?
[22:24] <jcoxon> wiki
[22:24] <jonsowman> ta
[22:24] <jcoxon> http://ukhas.org.uk/guides:parachute_sizing_chart
[22:27] <jonsowman> thanks
[22:30] <jonsowman> looks like I need a fairly big chute!
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[22:34] <jonsowman> any recommendations for ~1m parachute?
[22:39] <jonsowman> maybe 1.5
[22:46] <RocketBoy> whats the payload weight
[22:46] <RocketBoy> ?
[22:46] Action: natrium42 weighs himself
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[00:00] --- Wed Jun 30 2010