highaltitude.log.20090117

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[00:15] <Laurenceb> arg bloody octave
[00:15] <Laurenceb> it ate 3GB of ram
[00:16] <Laurenceb> hmm maybe I'll ssh into the ee depts IT room
[00:16] <Laurenceb> about 80 attempt at getting it right
[00:16] <SpeedEvil> what're you trying to do?
[00:17] <Laurenceb> process the data I collected from PRN29 setting
[00:17] <SpeedEvil> ah
[00:17] Action: SpeedEvil passes Laurenceb a book entitled 'Numerical recipies in C'.
[00:17] <Laurenceb> problem is there are 800000 doppler delay bins
[00:17] <Laurenceb> yeah
[00:18] <SpeedEvil> Umm.
[00:18] <SpeedEvil> Surely you only need 2048 bins first, then you get the doppler from there?
[00:19] <Laurenceb> no I'm generating an image in doppler delay space
[00:19] <SpeedEvil> ah
[00:19] <Laurenceb> from 40MB of raw data
[00:19] <Laurenceb> thing is thats 1 bit samples which octave insists have to be made into doubles
[00:25] <Laurenceb> http://imagebin.org/36027
[00:25] <Laurenceb> ^ thats an overhead sat
[00:37] <SpeedEvil> Well - can't you just slice the data into 10ms intervals, and do them?
[00:42] <Laurenceb> I am
[00:42] <Laurenceb> arg looks like I'm going to have to rip out the power cord again
[00:43] <SpeedEvil> man bash
[00:43] <SpeedEvil> look at ulimit
[00:43] <SpeedEvil> or nice
[00:43] <Laurenceb> ulimit?
[00:43] <SpeedEvil> limit how much a process can use
[00:43] <Laurenceb> xchat is about the only thing working here atm
[00:44] <SpeedEvil> :/
[00:44] <SpeedEvil> in a terminal, or X?
[00:44] <Laurenceb> hmm something is happening now
[00:44] <SpeedEvil> alt-sysrq-k will kill all processes on that tty (if enabled)
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[00:51] <SpeedEvil> On statistics. http://farm4.static.flickr.com/3134/3200285750_d2bd0a62fd.jpg
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[00:52] <Laurenceb> argg
[00:52] <Laurenceb> had to power cord it
[00:53] <Laurenceb> the screen went blank then the on off button refused to do anything
[00:53] <Laurenceb> then ubuntu waned me the boot sector was corrupted
[00:54] <SpeedEvil> ÂÂÂÂ:/
[00:54] <Laurenceb> luckly it managed to reboot
[00:54] <SpeedEvil> On statistics. http://farm4.static.flickr.com/3134/3200285750_d2bd0a62fd.jpg
[00:57] <SpeedEvil> ulimit -m 4000
[00:57] <SpeedEvil> will stop the shell, and any processes started by it from using over 4000 pages of memory
[00:57] <SpeedEvil> or 16M
[00:57] <SpeedEvil> nice process
[00:57] <SpeedEvil> will make the process have a low scheduling priority so you can kill it more easily
[01:02] <Laurenceb> ok
[01:03] <SpeedEvil> generally for stuff like that you want to limit it so it can't swap much
[01:03] <SpeedEvil> so limit it to 75% RAM, at which point, it shouldn't utterly kill the system
[01:08] <Laurenceb> ok
[01:08] <Laurenceb> I'm just rewriting it to use a bit less ram
[01:31] <Laurenceb> arg its not working
[01:32] <Laurenceb> this is horrible
[01:32] <Laurenceb> that didnt seem to make much difference
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[01:46] <Laurenceb> SpeedEvil: still about?
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[01:57] <SpeedEvil> ÂÂ
[01:57] <SpeedEvil> yes
[02:12] <Laurenceb> hello
[02:13] <Laurenceb> I was going to ask you if you had octave
[02:13] <Laurenceb> but nvm
[02:13] <Laurenceb> I'm writing it all in c now, with fftw
[02:13] <Laurenceb> gcc supports complex XD
[02:18] <Laurenceb> will be interresting to see if this is fast
[02:21] <SpeedEvil> Nope, Ive mostly used C or gnuplot for data reductions
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[02:31] <Laurenceb> hmm this will take a while
[02:31] <Laurenceb> oh well at least it'll be useful at the end
[02:33] <Laurenceb> how do I initialise a multidimensional array in c ?
[02:36] <SpeedEvil> for...
[02:36] <hallam> int foo[][]={{1,2,3},{4,5,6}}
[02:37] <SpeedEvil> or that
[02:39] <Laurenceb> ah yes
[02:39] <Laurenceb> thanks
[02:42] <Laurenceb> tap_sel=tap(sv,:); <-- can anyone tell me what that does in matlab?
[02:42] <Laurenceb> tap is a 2x37 element matrix
[02:45] <Laurenceb> its just grabbing the two element for sv?
[02:45] <hallam> what is sv?
[02:45] <Laurenceb> sv is our satellite PRN (1 to 37)
[02:45] <hallam> it's just a scalar?
[02:45] <hallam> then yeah it does that
[02:45] <Laurenceb> so tap_sel is a 2 element vector
[02:46] <Laurenceb> yeah makes sense
[02:46] <hallam> the colon means "all elements in this dimension"
[02:46] <Laurenceb> yeah
[02:46] <Laurenceb> http://imagebin.org/36027
[02:46] <Laurenceb> thast from earlier
[02:46] <Laurenceb> PRN15 was overhead
[02:48] <hallam> what are the axes?
[02:49] <Laurenceb> doppler and code phase bins
[02:50] <Laurenceb> 250 Hz doppler bins and phase in ADC samples
[02:50] <hallam> nice
[02:50] <Laurenceb> ADC is at 8.183MHz
[02:51] <hallam> thought it was 8.184 ;)
[02:51] <Laurenceb> 8183800
[02:51] <Laurenceb> you can halve that
[02:51] <Laurenceb> and go for 2 bit resolution
[02:52] <hallam> the sampler lets you choose? that's kind of cool
[02:52] <Laurenceb> I dont think so :(
[02:52] <hallam> so I guess they use the pulse mode of the SE4120
[02:52] <Laurenceb> the SE4120 can do that
[02:53] <Laurenceb> but the firmware on the cypress uC doesnt allow you to swap thats for sure
[02:53] <hallam> oh ok
[02:53] <Laurenceb> there may be a trace on the pcb to the relevant SE4120, but I havent opened it up yet
[02:53] <Laurenceb> *pin of the
[02:54] <hallam> the byte mode is considerably more convenient to interface to, but it seems it only lets you get 1 bit at 5.5MHz
[02:54] <Laurenceb> failing that you may be able to hack a dip switch on
[02:55] <hallam> I wonder why that is
[02:55] Action: Laurenceb looks at becnmarks for the AMD turion
[02:56] <Laurenceb> hmm fftw should run nice and fast
[02:57] <Laurenceb> hallam: its not too hard to make a front end completely from scratch
[02:57] <Laurenceb> but it would eat a lot of current
[02:57] <hallam> uhh
[02:57] <hallam> I think I'll pass
[02:58] <Laurenceb> as in AD parts
[02:58] <Laurenceb> yeah only really worth it if you enjoy pain :p
[02:59] <Laurenceb> but you could use an 8 bit ADC
[02:59] <gordonjcp> anyone good at C++ here?
[03:00] <Laurenceb> C is enough of a headache for me ATM :-/
[03:01] <hallam> 16Mbit/s of data is enough, thanks
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[03:21] <Laurenceb> hmm if tap_sel is a 1x2 matrix
[03:21] <Laurenceb> and q is 1x10
[03:22] <Laurenceb> what does mod(sum(q(tap_sel),2),2); do?
[03:23] <Laurenceb> its the q(tap_sel) that really confuses me
[03:26] <hallam> go to bed, it will make more sense in the morning
[03:26] <Laurenceb> lol
[03:26] <Laurenceb> yeah its insanely late
[03:27] <hallam> if q = [a,b,c,d,e,f]
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[03:27] <hallam> and tap_sel = [2,5]
[03:27] <hallam> then q(tap_sel)=[b,e]
[03:28] <Laurenceb> ah I see
[03:28] <Laurenceb> thanks
[03:28] <hallam> then "help sum" should tell you the rest
[03:34] <hallam> http://www.amazon.co.uk/Software-defined-GPS-Galileo-Receiver-Single-frequency/dp/0817643907/ref=sr_1_1?ie=UTF8&s=books&qid=1232163260&sr=8-1
[03:34] <edmoore> cusf predictor updated to use a non-bizarre descent rate unit
[03:37] <Laurenceb> hallam: that boks on my shelf :P
[03:37] <hallam> was just pasting it for fergus
[03:38] <Laurenceb> its mostly matlab orientated
[03:39] <Laurenceb> not many ideas in there about embedded stuff
[03:39] <Laurenceb> but it covers all you need to know
[03:41] <hallam> does it cover all the gps protocol stuff?
[03:42] <Laurenceb> well... it covers it
[03:42] <Laurenceb> but its rather hard to follow
[03:43] <Laurenceb> maybe not the best reference
[03:43] <Laurenceb> IMO they got bored writing that section
[03:44] <Laurenceb> but for GPS its not horrendously complex
[03:47] <Laurenceb> so is g2[inc]=(q[tap_sel[0]]+q[tap_sel[1]])%2;
[03:47] <Laurenceb> the same as g2(:,inc)=mod(sum(q(tap_sel),2),2); in matlab?
[03:48] <Laurenceb> tap_sel is a 1x2 matrix and q is 1x10
[03:52] <hallam> The RHS is correct, I think
[03:52] <hallam> not sure about the LHS since apparently g2 is 2-dimensional in matlab?
[03:52] <hallam> btw
[03:52] <hallam> you know matlab has the ability to compile to embedded-oriented C code?
[03:56] <Laurenceb> yeah
[03:56] <Laurenceb> is it any good?
[03:56] <Laurenceb> maybe : just means the 1 dimension
[03:56] <Laurenceb> ie its 1x1023
[03:59] <Laurenceb> what does g1=[mod(sum(g1.*s),2) g1(1:n-1)]; mean?
[03:59] <Laurenceb> I dont follow the [] surrounding it
[03:59] <hallam> yeah the [] is superfluous
[03:59] <hallam> I think the compiler's reasonable
[04:00] <hallam> I've only used it a few times
[04:00] <Laurenceb> interesting
[04:01] <Laurenceb> hmm but the mod gives a scalar
[04:01] <Laurenceb> and we then have the g1
[04:01] <Laurenceb> I dont follow
[04:02] <hallam> oh
[04:02] <hallam> I missed the space
[04:02] <hallam> well g1=[3 4] would give a 1x2 vector
[04:02] <Laurenceb> ah
[04:02] <hallam> it's the same as g1=[3,4]
[04:02] <hallam> you can use space instead of comma
[04:02] <Laurenceb> ok
[04:02] <Laurenceb> g1.*s ??
[04:03] <hallam> multiply every element of g1 with the corresponding element in s
[04:03] <Laurenceb> ah
[04:03] <hallam> rather than trying to do a matrix multiplication
[04:03] <Laurenceb> I'll get there in the end
[04:03] <Laurenceb> its only 4 lines on code :-/
[04:03] <Laurenceb> *of
[04:04] <hallam> what are you trying to do, implement gps on a micro?
[04:04] <Laurenceb> no
[04:04] <Laurenceb> on my laptop
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[04:04] <Laurenceb> at a decent speed
[04:05] <hallam> oh, I see
[04:05] <hallam> matlab takes a while then?
[04:06] <Laurenceb> ~ 1 minute for 1ms of data
[04:06] <hallam> crikey
[04:06] <hallam> to search the whole search space?
[04:06] <Laurenceb> yes
[04:06] <hallam> might it actually take less time for a longer sequence?
[04:06] <Laurenceb> no
[04:06] <hallam> sucks
[04:06] <Laurenceb> but one you setup tracking loops its much faster
[04:07] <Laurenceb> *once
[04:07] <hallam> what do they do?
[04:07] <Laurenceb> however... I like the concept of no tracking loops
[04:07] <Laurenceb> early late prompt
[04:07] <Laurenceb> DLL
[04:08] <Laurenceb> I think with fftw my machine is more than capable of running without any tracking loops
[04:08] <hallam> over my head I think
[04:08] <hallam> ok, goodnight
[04:08] <hallam> good luck
[04:08] <Laurenceb> cya
[04:08] <Laurenceb> thanks
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[06:49] <natrium42> bill brown's beacon test today (17th) --> http://home.hiwaay.net/~bbrown/
[06:49] <natrium42> 144.340 MHz FM (AFSK 45 baud RTTY)
[06:49] <natrium42> 144.340 MHz SSB (FSK 45 baud RTTY and Hellscreiber) Alternating modes each transmission
[06:50] <natrium42> launched from Huntsville Alabama
[06:50] <natrium42> at 1:00 pm CST
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[11:32] <jcoxon> morning all
[11:57] <gordonjcp> morning jcoxon
[12:00] <jcoxon> hey gordonjcp
[12:18] <edmoore> jcoxon: good morning
[12:18] <edmoore> and gordonjcp
[12:22] <jcoxon> hey edmoore
[12:23] <edmoore> am just about to head to the dept as there's a session to get a flight ready ZP
[12:23] <jcoxon> amazing
[12:23] <edmoore> i'll robably carry on with badger2 in the corner
[12:23] <edmoore> but the general jist is action stations!
[12:24] <jcoxon> woohoo
[12:24] <jcoxon> i'm about to go to china town
[12:24] <edmoore> awesome
[12:24] <edmoore> shopping?
[12:24] <edmoore> lunch?
[12:24] <jcoxon> lunch - dim sum
[12:24] <edmoore> very nice :)
[12:25] <jcoxon> then off home for this evening
[12:25] <jcoxon> back to sunny suffolk
[12:25] <edmoore> it is pretty sunny out
[12:25] <edmoore> jcoxon: the predictor has been modded slightly
[12:26] <edmoore> the parameter for descent is now the sea-level descent rate
[12:26] <edmoore> not sure why it ever wasn't but anyway, it's modded now
[12:26] <jcoxon> okay cool
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[12:27] <edmoore> anyway bbl
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[13:37] <EI5GTB> i finally go t an e-mail from the iia
[13:38] <EI5GTB> they told me that "Hi Paul,
[13:38] <EI5GTB>
[13:38] <EI5GTB> Responsibility for Weather balloon launches in Ireland rests with Met Eireann.
[13:38] <EI5GTB> "
[13:38] <EI5GTB> like, wtf>?
[13:39] <EI5GTB> does it?
[13:39] <EI5GTB> and why did it take 4 months to tell me that
[13:44] <SpeedEvil> because they make this shit yup as they go along.
[13:44] <SpeedEvil> And it'll take another 4 months for met eirann to say it doesn't/
[14:24] <EI5GTB> ffs
[14:24] <EI5GTB> yea
[14:24] <EI5GTB> and the thing is, comreg wont give me a radio licence for the thing until i get the go ahead from someone
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[16:31] <jcoxon> afternoon all
[16:50] <epictetus> http://www.wta.org/trail-news/photo-contest/2009-contest-winners/grand_prize_campbell.jpg ee
[16:50] <epictetus> accidental cutpaste
[16:50] <epictetus> sorry
[16:52] <jcoxon> :-)
[16:54] <EI5GTB> hai all
[16:54] <EI5GTB> jcoxon, iaa finally told me to get permission from met eirrean
[16:55] <jcoxon> oh
[16:55] <jcoxon> strange
[16:55] <EI5GTB> any of you uk guys tell me what kinda numb this is: 08455272542
[16:58] <SpeedEvil> It's a phone number.
[16:58] <SpeedEvil> Specifically.
[16:58] <jcoxon> keep going - oneday someone will say yes!
[16:58] <SpeedEvil> It's a non-geographic number, which costs slightly more than a out-of-area phone call.
[16:59] <EI5GTB> ah, ok
[16:59] <EI5GTB> when you ring that it reaches my desk :D
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[17:03] <EI5GTB> what about a 0870 or 01801 numbers
[17:03] <EI5GTB> what are thay?
[17:04] <SpeedEvil> 0180 is a geographic I think
[17:04] <Hiena> ' evening!
[17:04] <SpeedEvil> and 0870 is a mobile of some sort.
[17:04] <SpeedEvil> IIRC ofcom has a big list
[17:05] <EI5GTB> i see
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[17:49] Action: SpeedEvil finds http://www.phonespamfilter.co.uk/phones.php/08455272
[17:50] <SpeedEvil> indicating you're probably not a debt solicitor :)
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[18:44] <EI5GTB> im not
[18:44] <EI5GTB> ?
[18:46] <SpeedEvil> I just tried googling the number.
[18:50] <EI5GTB> XD
[18:54] <EI5GTB> oh, im not a telemarketer, ah
[18:58] <natrium42> hi
[18:58] <natrium42> so, HF beacon test today?
[18:58] <natrium42> http://home.hiwaay.net/~bbrown/
[19:08] <natrium42> wait, that's not hf
[19:08] <natrium42> wtf
[19:46] <Laurenceb> hello
[19:48] <SpeedEvil> ÂÂÂhello
[19:53] <Laurenceb> I have some acquisition c code almost working
[19:54] <Laurenceb> for some reason all the doppler bins are the same
[19:57] <Laurenceb> http://pastebin.com/m448b7ead
[19:57] <Laurenceb> bbl
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[20:17] <Laurenceb> hmm cexp isnt working
[20:18] <Laurenceb> cexp(I*((j*j_step)+j_start)*n) gives 1,0
[20:18] <Laurenceb> anyone used c99 complex.h ?
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[20:28] <Laurenceb> hmm cexp appears to be broken :/
[20:31] <natrium42> jcoxon, bill browns test wasn't even HF :(
[20:32] <jcoxon> oh yeah
[20:32] <jcoxon> 145mhz
[20:33] <natrium42> :'(
[20:33] <natrium42> i was looking forward to HF
[20:34] <jcoxon> was it a sucessful flight?
[20:34] <natrium42> dunno, is there a chat?
[20:34] <jcoxon> hmmm i don't think so
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[20:36] <natrium42> hi RocketBoy
[20:36] <RocketBoy> yo
[20:37] <RocketBoy> jcoxon: arround?
[20:37] <jcoxon> hey RocketBoy
[20:37] <jcoxon> how can i help
[20:38] <RocketBoy> hi - have you worked out the digital interface to the 817 yet?
[20:38] <RocketBoy> it looks like its a strange star like connector?
[20:39] <jcoxon> i haven't yet though rjharrison has
[20:39] <jcoxon> its serial
[20:40] <jcoxon> though 5v so needs some shifting
[20:40] <jcoxon> i was thinking of just getting the usb cable off ebay
[20:42] <RocketBoy> Ah OK - I thought you would be on to the case - much simplere to interface than the FT790
[20:42] <jcoxon> software wise hamrig supports it just fine
[20:42] <jcoxon> RocketBoy, that said i am going to continue to interface to the ft790 (though without opening it up)
[20:43] <RocketBoy> Was thinking of getting one as it seems eveyone buy me has one
[20:43] <jcoxon> as a base station for london while the ft817 is more portable
[20:44] <RocketBoy> So looking about ther is the FT817 and FT817ND - but the only difference I can work out is in the ND there is 60 meters coverage and a better battery pack
[20:45] <jcoxon> yeah
[20:45] <jcoxon> i've got a 817ND
[20:45] <jcoxon> some pop up on ebay for a bit less then asking price
[20:45] <jcoxon> i in the end got a new one from radioworld
[20:51] <RocketBoy> They seem to have a special on with a 817ND + Z100 ATU for not too many £ http://www.radioworld.co.uk/~radio/catalog/ft817-package-ft817nd-z100-sp725-mobile-p-977.html?osCsid=89947ac1955f359e54f9cdf014826d11
[20:51] <jcoxon> yeah interesting
[20:53] <RocketBoy> ATUs = strange beasts
[20:53] <jcoxon> yeah they seem to be
[20:54] <jcoxon> i've been very impressed with teh 817, its really quite tiny
[20:56] <RocketBoy> yeah from the specs it has more than fair perfomance - not quite a IC7000 but not far off
[20:56] <jcoxon> apparently there are some inaccuracies with the specs
[20:56] <RocketBoy> but the FT817 is more mobile
[20:57] <jcoxon> the manual says that they are better then the advert i think
[20:57] <jcoxon> edmoore and rjharrison know more
[21:02] <RocketBoy> There seemed to be a contest on 80 and 40m today the band was alive with station
[21:03] <RocketBoy> s
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[21:09] <hallam> Hey all
[21:10] <hallam> Does anyone have a model for the internal pressure in a latex balloon?
[21:10] <hallam> i.e. differential pressure between inside and outside
[21:10] <hallam> I know it decreases with radius, but I'm looking for some numbers
[21:13] <Laurenceb> hi hallam
[21:13] <RocketBoy> I worked it out to be quite small based on the data on the kaymont site - in the range of 5 - 10kpa
[21:13] <Laurenceb> hallam: maybe look at stree curves for latex?
[21:13] <Laurenceb> *stress
[21:13] <Laurenceb> or whatever the correct term is
[21:13] <Laurenceb> hallam: I got the c code working http://imagebin.org/36089
[21:13] <hallam> thanks RocketBoy, is that near full inflation?
[21:14] <Laurenceb> lots of multipath :P
[21:14] <hallam> Laurenceb, yeah but I really don't fancy spending an hour deriving it without any evidence to check it against
[21:14] <Laurenceb> hopefully you can do tomograhpy with that
[21:14] <Laurenceb> yeah
[21:14] <hallam> what am I seeing in that graph?
[21:14] <Laurenceb> doppler/pseudorange
[21:14] <Laurenceb> and signal amplitude
[21:15] <Laurenceb> for PRN29 setting last night
[21:15] <RocketBoy> yes at burst - it was based on the ground inflated diameter, amount of gas, burst diameter and altitude
[21:15] <Laurenceb> thats at -1 degree elevation
[21:15] <hallam> doppler on the y axis, pseudorange on the x, intensity on the colour?
[21:15] <hallam> ok thanks
[21:15] <Laurenceb> hallam: my phd research is aimed at putting something like that on a sat
[21:15] <Laurenceb> hallam: yeah
[21:16] <hallam> to spy on other satellites?
[21:16] <Laurenceb> no
[21:16] <Laurenceb> for atmospheric tomography
[21:16] <Laurenceb> or sounding
[21:17] <Laurenceb> without navigation data theres a 300km ambiguity in range
[21:17] <hallam> sounds a lot like the radio science experiments they do with the planetary probes
[21:18] <Laurenceb> yeah, but with gps and galileo theres much more data that can be collected
[21:18] <Laurenceb> ~300 occultations per day from LEO
[21:19] <hallam> cool
[21:20] <Laurenceb> its not that exciting :P
[21:20] <gordonjcp> I'm about to attempt to work the ISS repeater, if anyone's up for a listen
[21:21] <RocketBoy> on?
[21:21] <gordonjcp> 437.8MHz give or take
[21:22] <gordonjcp> tune a little high as the pass starts, and tune down for doppler as it passes
[21:22] <gordonjcp> starting any time now
[21:22] <gordonjcp> if you can tx, then it's 145.99 with a 67Hz PL tone
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[21:26] <RocketBoy> gordonjcp: nothing heard as yet - u?
[21:26] <gordonjcp> no
[21:26] <gordonjcp> think it might be turned off
[21:27] <gordonjcp> ah well
[21:30] <RocketBoy> not a sausage here
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[22:10] <jcoxon> wooohoo snakes on a plane
[22:18] <Laurenceb> the music is good
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[22:23] <jcoxon> its such a good film
[22:25] <Laurenceb> not thats good
[22:25] <Laurenceb> its only a spoof
[22:25] <jcoxon> hehe
[22:25] <jcoxon> what more could you want from a film!
[22:26] <jcoxon> samuel L jackson and a load of snakes on a plane - perfect viewing
[22:29] <jcoxon> bbl
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[23:11] <hallam> Laurenceb: Any luck getting the SE4120 stick to work with windows 64-bit?
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[23:19] <Laurenceb> I have xp 32 bit
[23:21] <hallam> yeah, i guess I should bite the bullet and reboot into 32 bit
[23:22] <hallam> any chance you could do me a big favour?
[23:23] <hallam> I've ordered the Colorado book (Borre et al) but it won't be here for a week, and I could really do with a copy of the software
[23:26] <Laurenceb> afraid I left the cd in my office on the research park
[23:26] <hallam> ok no worries
[23:26] <Laurenceb> cant find it in my room
[23:26] <Laurenceb> k
[23:26] <hallam> thanks for looking :)
[23:28] <Laurenceb> hmm I've just done a higher resolution image.... I'm not sure its actually the sat
[23:28] <hallam> oh?
[23:28] <fergusnoble> hallam: are you playing with the usb dongle?
[23:28] <hallam> what happens if you collect data when there's no sat?
[23:28] <hallam> fergusnoble: I was going to, but thought I'd play with some theory first
[23:28] <hallam> going to try simulating it in matlab
[23:28] <fergusnoble> hallam: i think ive found a telescope that is cheap and will work
[23:29] <hallam> cool
[23:29] <fergusnoble> meade DS-2080AT
[23:29] <hallam> link?
[23:29] <fergusnoble> can get them for about £170
[23:29] <SpeedEvil> hallam: you just get noise
[23:29] <SpeedEvil> fergusnoble: what for?
[23:30] <SpeedEvil> fergusnoble: scope
[23:30] <fergusnoble> SpeedEvil: using the computerised mount for the antenna
[23:30] <SpeedEvil> fergusnoble: ah
[23:30] <SpeedEvil> fergusnoble: ebay may be of use
[23:30] <fergusnoble> and also doubles up as a spotting scope
[23:30] <hallam> how do you mount the antenna?
[23:30] Action: SpeedEvil passes hallam duct tape.
[23:30] <fergusnoble> going to write software to point it automagically at the balloon using the recieved position of the balloon
[23:31] <fergusnoble> hallam: we can rig something up
[23:31] <SpeedEvil> fergusnoble: what class of antenna?
[23:31] <fergusnoble> at the very least we can make a mount that straps to the telescope tube
[23:31] <fergusnoble> yagi
[23:32] <hallam> yeah, I do think it ought to be set off from the tube a bit so as not to fuck the radiation pattern
[23:32] <hallam> I like the sound of this "level north technology"
[23:32] <fergusnoble> hallam: the good thing is they have published the command set on their website
[23:32] <hallam> cool
[23:32] <fergusnoble> also has a digital compass built in for alignment
[23:32] <hallam> right
[23:32] <hallam> I'm sure it will accept an RA/dec
[23:32] <Laurenceb> hallam: yeah I need to try with no sats
[23:32] <fergusnoble> yup it does
[23:33] <fergusnoble> its an ascii serial protocol
[23:33] <fergusnoble> looks like most things can be set over the serial connection
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[23:34] <fergusnoble> how much do yo think the scope will upset the antenna?
[23:34] <natrium42> hi
[23:35] <fergusnoble> natrium42: hello
[23:35] <natrium42> fergusnoble: so what did rob have to say about using the nomad server?
[23:35] <fergusnoble> hallam: bt before we get it i will phone someone i know who i think has that model of scop
[23:35] <fergusnoble> maybe he can give s an idea of the torqe
[23:36] <hallam> ok
[23:36] <hallam> the antenna shouldn't really give it much more torque
[23:36] <Laurenceb> its really not that hard to aim by hand :P
[23:38] <Laurenceb> guess it avoid issues with poor aim meaning lost packets
[23:38] <Laurenceb> but most of the time that happens due to poor retuning
[23:39] <hallam> fergusnoble: shouldn't we just get this? http://www.meade.com/maxmount/index.html
[23:39] <hallam> ;) ;)
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[23:40] <Laurenceb> are you using fldigi now?
[23:41] <natrium42> hallam: ooh :)
[23:41] <natrium42> gimme
[23:42] Action: Laurenceb loves fftw3
[23:42] <Laurenceb> its soo fast
[23:46] <SpeedEvil> np: Meatloaf - Bat out of hell.
[23:47] <Laurenceb> http://imagebin.org/36098
[23:48] <Laurenceb> its spread across too much in frequency imo
[23:48] <Laurenceb> thats +-10KHz doppler
[23:52] <SpeedEvil> 10KHz is ...
[23:52] <fergusnoble> natrium42: rob didnt know abot that server
[23:52] <SpeedEvil> 2m//s
[23:52] <SpeedEvil> multipath
[23:52] Action: SpeedEvil holds up his multipath.
[23:53] Action: SpeedEvil should probably stop with the bad Fifth Element puns.
[23:53] <fergusnoble> Laurenceb: we're mainly doing it beacese its cool
[23:54] <Laurenceb> best reason to do anything :D
[23:54] <fergusnoble> also less time spent pointing antennas means more time to sit arond sipping a beer
[23:54] <Laurenceb> multipasss
[23:54] <hallam> SpeedEvil: how do you get that for the doppler?
[23:54] <Laurenceb> yeah thats way too low
[23:54] <hallam> I make it 2km/s
[23:54] <Laurenceb> yeah me too
[23:55] <SpeedEvil> 1.2GHz/10KHz 8
[23:55] <SpeedEvil> *C
[23:55] <hallam> well I don't even know where to start with that
[23:56] <hallam> shirley you mean 10kHz / 1.5GHz * c
[23:56] <Laurenceb> lol
[23:56] <SpeedEvil> hallam: yes.
[23:56] <hallam> which is still not 2m/s
[23:56] <SpeedEvil> hallam: I blame my keyboard.
[23:56] <SpeedEvil> And possibly lack of sleep.
[23:56] <Laurenceb> L1 is 1.5GHz
[23:57] <Laurenceb> L2=1.26GHz
[23:57] <Laurenceb> I think I need to run the code on another prn number
[23:58] <Laurenceb> problem is it absolutely kill gnuplot for some reason
[23:58] <SpeedEvil> gnuplot doesnt like huge data eleemtns
[23:58] <Laurenceb> yeah
[23:58] <Laurenceb> it ate 2GB of swap
[23:59] Action: SpeedEvil realises he can['t paste from this window.
[00:00] --- Sun Jan 18 2009