highaltitude.log.20140123

[00:00] <Laurenceb_> well +-0.5
[00:01] <LeoBodnar> OK, that should work
[00:02] <LeoBodnar> *statistically on average
[00:02] <Laurenceb_> should run anywhere if you install octave
[00:02] <Laurenceb_> heh
[00:02] <Laurenceb_> s/run/fail
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[00:03] <Laurenceb_> seems to be running now
[00:03] <Laurenceb_> 1-3 searched so far
[00:04] <LeoBodnar> oh
[00:05] <Laurenceb_> nothing at 5 :-/
[00:05] <LeoBodnar> hmm
[00:06] <Laurenceb_> maybe i screwed the order
[00:06] <LeoBodnar> I have used 250Hz step and got maximum at -3250Hz
[00:06] <Laurenceb_> ok, id doing the same step size
[00:09] <LeoBodnar> what is your integration length?
[00:09] <Laurenceb_> 2ms
[00:11] <LeoBodnar> should pick it up
[00:11] <Laurenceb_> yeah
[00:11] <Laurenceb_> somethigns screwed
[00:12] <Laurenceb_> IF is 4Mhz right?
[00:12] <Laurenceb_> you didnt do any conversion?
[00:12] <LeoBodnar> 4092000Hz
[00:13] <Laurenceb_> so sample rate/4?
[00:13] <LeoBodnar> yes
[00:13] <Laurenceb_> dunno then
[00:13] <Laurenceb_> feel free to try the code :P
[00:13] <Laurenceb_> i need to sleep
[00:14] <LeoBodnar> good night! i'm off too
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[00:19] <UR5FSV> Hi guys, hope all doing well. need an advice how to solve error with DL-Fldigi, gives me all the times Caught runtime error:EZ::HTTPResponse HTTP 403 (http://habitat.habhub.org/habitat/33a4ff.......
[00:20] <UR5FSV> any ideas? re-start, re-install and alike do not help
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[00:25] <Laurenceb_> OH SHIT
[00:25] <Laurenceb_> im searching for prn in back to front time
[00:26] <Laurenceb_> doh
[00:27] <Laurenceb_> http://pastie.org/8658713
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[01:15] <SpeedEvil> Laurenceb: :)
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[01:25] <UR5FSV> hi guys, anybody can help with dlfldigi
[01:25] <UR5FSV> all the times get weird msg Caught runtime error:EZ::HTTPResponse HTTP 403 (http://habitat.habhub.org/habitat/33a4ff.......
[01:29] <adwiens> hi UR5FSV
[01:30] <adwiens> #habhub might be able to help
[01:32] <UR5FSV> hi adwiens, thnks 4 advice, we chase him with question
[01:32] <Darkside> UR5FSV: hows the situation where you are?
[01:32] <Darkside> lots of news reports about things getting back in ukraine
[01:33] <UR5FSV> odessa,ukraine, plenty crap going in kiev, but pretty quiet in here
[01:33] <Darkside> mm ok
[01:34] <UR5FSV> nevermind, it will end sooner or later:)
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[08:27] <Laurenceb_> sup folks
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[08:31] <Laurenceb_> LeoBodnar: so i took a look at your baseband
[08:32] <Laurenceb_> looks like there are some narrowband spikes, but only 2 of them and <1% of total energy
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[08:36] <LeoBodnar> ah, ok
[08:36] <LeoBodnar> do you have a picture?
[08:36] <LeoBodnar> back shortly
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[08:40] <Laurenceb_> http://i.imgur.com/roE6L2V.png
[08:40] <Laurenceb_> sat5 with 2ms integration
[08:41] <Laurenceb_> http://pastebin.com/v0SWv9n7
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[09:00] <LeoBodnar> back
[09:00] <LeoBodnar> good morning
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[09:03] <fsphil> morning
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[09:36] <ibanezmatt13> is anybody good at trig equations? 4tan(4x) sin(4x) = 15 :/
[09:37] <ibanezmatt13> Once I've got only one trig ratio like sin or tan, I'm fine. I just can't think how to get there with this one with the identities
[09:51] <ibanezmatt13> ah it's ok, sorted it
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[10:15] <airgiraffe> I'm looking to launch a HA balloon within the next month in the UK, wondering where the best site to launch from would be?
[10:18] <eroomde> morning
[10:18] <Hix> Anywhere, subject to NOTAM approval. The areas that seem to get approved are: Cambs, Lincs, Far SW of the country, Severn Valley - Worcs way.
[10:18] <eroomde> airgiraffe: lots of people apply for their own permissions somewhere locally
[10:18] <Hix> moring eroomde
[10:18] <eroomde> morning Hix
[10:19] <airgiraffe> Thanks, my main issue is avoiding it landing in the sea
[10:19] <eroomde> where are you?
[10:20] <airgiraffe> Cheltenham, Gloucestershire
[10:20] <Hix> You should have quite a good chance of a NOTAM round there
[10:20] <eroomde> yeah
[10:20] <eroomde> and also you're west enough
[10:21] <eroomde> there's a couple who launch from the forrest of dean
[10:21] <Hix> and with prevailing SW wind, you should avoiud the drink
[10:21] <eroomde> also worcester
[10:21] <eroomde> so you are probably fine around there
[10:21] <Hix> *That's not lifestyle advice its a reference to the sea ;p
[10:22] <airgiraffe> aha, thanks everyone, it's early days yet, but hopefully will become a reality :)
[10:22] <Hix> these two maps give you an idea of airspace usage: http://stratosvision.com/docs/UK-ATS-AIRSPACE.pdf http://stratosvision.com/docs/ATSAirspaceUpper.pdf
[10:23] <Hix> and this is the application form for a NOTAM - you might want to apply sooner rather than later, they can take some time http://stratosvision.com/docs/CAALaunchForm.doc
[10:24] <fsphil> understatement
[10:29] <Laurenceb> LeoBodnar: yo
[10:29] <Laurenceb> so i can find sats with 2ms integration
[10:29] <Laurenceb> the signal looks good, cleaner than SiGe sampler
[10:29] <Laurenceb> well - fewer and smaller narrowband spikes
[10:30] <Laurenceb> SiGe sampler has ~10% of energy in narrowband, your board is <1%
[10:31] <Laurenceb> i think the "A-GPS" idea can be done with 2ms data
[10:33] <Laurenceb> i still think there is some noise from somewhere tho
[10:34] <Laurenceb> it almost looks like something is intermittently saturating the front end
[10:34] <LeoBodnar> yo
[10:34] <Laurenceb> maybe power supply noise?
[10:34] <Laurenceb> that may explain the AGC issues
[10:34] <LeoBodnar> maybe
[10:34] <Laurenceb> are you able to run it off a battery?
[10:34] <LeoBodnar> or AGC is flickering
[10:34] <Laurenceb> <Laurenceb_> http://i.imgur.com/roE6L2V.png
[10:34] <Laurenceb> <Laurenceb_> sat5 with 2ms integration
[10:34] <Laurenceb> <Laurenceb_> http://pastebin.com/v0SWv9n7
[10:34] <Laurenceb> if you missed it
[10:35] <LeoBodnar> on a HAB one can probably force fixed gain and switch AGC off
[10:35] <Laurenceb> yes
[10:35] <LeoBodnar> yeah cool
[10:35] <Laurenceb> two spikes - 2ms
[10:35] <LeoBodnar> seen the pics thanks!
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[10:36] <LeoBodnar> do you have the pic of the baseband spectrum?
[10:36] <Laurenceb> just a sec - ill redraw it here...
[10:36] <Laurenceb> where is the data file?
[10:36] <LeoBodnar> I have a spike near 3.720MHz
[10:36] <Laurenceb> sounds about right
[10:38] <LeoBodnar> data is here http://leobodnar.com/balloons/files/gpsdata.bin
[10:38] <Laurenceb> thanks
[10:40] <Laurenceb> http://i.imgur.com/PrPH020.png
[10:40] <Laurenceb> thats 8Mhz wide
[10:42] <LeoBodnar> Oh, I got this http://leobodnar.com/balloons/files/gpsspectrum.png
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[10:43] <LeoBodnar> what does your graph show?
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[10:43] <Laurenceb> thats fft of the signal after i downconvert
[10:43] <Laurenceb> line 12 of the codew
[10:43] <LeoBodnar> ok
[10:44] <LeoBodnar> got it
[10:45] <LeoBodnar> I have to figure out how to preserve data when running off battery
[10:46] <Laurenceb> ill grab the Kai Borre code, combine it with wget to grab the almanac and try doing some A-GPS at some point
[10:46] <Laurenceb> soon as i have more spare time
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[10:46] <LeoBodnar> cool
[10:47] <LeoBodnar> 2 ms seems workable
[10:47] <Laurenceb> heh
[10:47] <Laurenceb> one of those peaks is DC
[10:47] <Laurenceb> so the other is your 3.72Mhz
[10:47] <LeoBodnar> yeah offset is a bit too high
[10:48] <LeoBodnar> but if it works :/ shrug
[10:48] <Laurenceb> its normal to get LO leakage
[10:48] <Laurenceb> but i would expect the DSP filtering on the front end to remove it
[10:49] <LeoBodnar> I don't think they have any DSP processing
[10:49] <Laurenceb> they do
[10:49] <LeoBodnar> in 4110?
[10:49] <Laurenceb> they have bandpass
[10:49] <Laurenceb> yes
[10:49] <LeoBodnar> well I did not count bandpass as DSP :D
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[10:52] <Laurenceb> hmf
[10:52] <Laurenceb> FFT deconvolve fails as most of the values are zero
[10:53] <Laurenceb> for >4Msps
[10:53] <Laurenceb> very odd
[10:54] <Laurenceb> theres some lovely mathsy reason for this i know
[10:56] <Laurenceb> oh - its because its >1ms of data
[10:56] <Laurenceb> how annoying
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[10:56] <LeoBodnar> hmm
[10:57] <Laurenceb> i was using brute force correlate on the graph
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[10:58] <LeoBodnar> would averaging several samples 1 msec apart help? say 8 samples averaged. Do it twice to avoid bit transitions
[10:58] <Laurenceb> i dunno
[10:58] <LeoBodnar> You still correlate over 1msec but data has been averaged
[10:59] <Laurenceb> ill try averaging two 1ms FFT results
[10:59] <LeoBodnar> 16msec is short enough for PRN edges not to drift significantly
[10:59] <Laurenceb> yes
[10:59] <LeoBodnar> try averaging few 1msec data
[10:59] <Laurenceb> ill try it
[11:00] <LeoBodnar> so you get benefits of integration without increasing processing time
[11:00] <LeoBodnar> interesting
[11:00] <LeoBodnar> sounds good so there must be a fault in this idea
[11:00] <Laurenceb> heh
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[11:06] <LeoBodnar> well averaging = massive multipath
[11:07] <LeoBodnar> so may have fading depending on how carrier phase changes at the beginning of each 1msec interval
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[11:15] <Laurenceb> for some reason i have sane numbers until i ifft
[11:15] <Laurenceb> then i get Nan
[11:16] <LeoBodnar> Nan cat strikes back
[11:21] <Laurenceb> ok i see
[11:22] <Laurenceb> some frequency components are zero
[11:22] <Laurenceb> then when i divide by the fft(prn) i get infinity
[11:22] <Laurenceb> dunno whats going on here
[11:22] <Laurenceb> maybe i need to corrupt the PRN
[11:24] <PE2G> Morning all, I'll put the De Bilt (NL) ozone sonde on APRS. Launch at ~11:30 UTC.
[11:24] <PE2G> http://aprs.fi/#!mt=roadmap&z=11&call=a%2FPE2G-11&timerange=10800&tail=10800
[11:26] <PE2G> http://predict.habhub.org/#!/uuid=93e24606f81c91eec5811a139fe1c6959db1df33
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[11:48] <Laurenceb> LeoBodnar: ok i think i got the issue
[11:48] <Laurenceb> you have to add the doppler to the PRN
[11:49] <Laurenceb> for it to be stable
[11:49] <Laurenceb> but thats annoying as you can't precompute
[11:49] <Laurenceb> im trying it with a little bit of doppler pre added to the PRN
[11:50] <LeoBodnar> you mean chip transition move?
[11:50] <Laurenceb> not exactly
[11:50] <LeoBodnar> the shift is tiny
[11:50] <Laurenceb> im talking about the FFT deconvolution
[11:50] <LeoBodnar> ah
[11:50] <Laurenceb> for >1.023Msps it fails
[11:50] <Laurenceb> due to zeros in the PRN fft
[11:50] <Laurenceb> Kai Borre added doppler to the PRN
[11:51] <Laurenceb> which fixes this but is annoying
[11:51] <Laurenceb> im trying fixed doppler on the PRN and precompute
[11:51] <Laurenceb> just for numerical stability
[11:51] <LeoBodnar> oh so precompiled data size explodes by a factor of 50?
[11:51] <Laurenceb> no
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[11:51] <Laurenceb> well you could do it that was
[11:51] <Laurenceb> *way
[11:52] <Laurenceb> otherwise you need to FFT a PRN for each doppler
[11:52] <Laurenceb> very annoying
[11:52] <LeoBodnar> yah
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[11:52] <Laurenceb> i need to read the xcorr2 source code
[11:52] <Laurenceb> for gnu octave
[11:52] <Laurenceb> they have fftw accelerated correlation that seems immune to this issue and finds the sats
[11:56] <Chetic> http://linuxgizmos.com/tiny-arm9-module-runs-linux/
[11:57] <Laurenceb> hmf its not my day today
[11:57] <Laurenceb> i cant make it work
[11:57] <Laurenceb> only the built in correlation functions are stable
[11:57] <Laurenceb> Nan disasters
[11:58] <Laurenceb> guess i need to read about how to make this numerically stable, its clearly possible
[11:58] <Laurenceb> but i dont follow the maths
[12:05] <Laurenceb> need a maths guru to look at it i think
[12:07] <Laurenceb> bbl lunch
[12:13] <eroomde> The maintainer of OpenOCD is called Freddie Chopin
[12:13] <eroomde> this leaves me very conflicted
[12:14] <eroomde> appropriating the name of a genius to inflict OpenOCD on the word, which is not the work of a genius
[12:19] <Laurenceb> finally
[12:19] <Laurenceb> http://i.imgur.com/947o3wX.png
[12:19] <Laurenceb> 2ms
[12:19] <Laurenceb> the spike is correct - it grows as time increased
[12:19] <LeoBodnar> is this PRN 5?
[12:20] <Laurenceb> yup
[12:20] <LeoBodnar> OK
[12:20] <Laurenceb> with precomputed fft
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[12:20] <Laurenceb> i fixed it
[12:20] <LeoBodnar> I suspect there is a bit transition in these 8 msec on sat 5
[12:20] <LeoBodnar> checking on that...
[12:20] <Laurenceb> and the simple averaging works
[12:21] <Laurenceb> (for 2ms data)
[12:21] <LeoBodnar> really?
[12:21] <Laurenceb> yup
[12:21] <LeoBodnar> hmm
[12:21] <Laurenceb> the problem is you need more doppler resolution
[12:22] <Laurenceb> but for A-GPS that might not be a big issue for 2 to 4ms
[12:22] <Laurenceb> i took the doppler out and did it before the averaging
[12:22] <LeoBodnar> do you know how large are sat clock corrections and how often they are changing?
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[12:27] <Laurenceb> not off the top of my head
[12:27] <Laurenceb> but aiui its small
[12:28] <Laurenceb> id be more worried about velocity induced doppler
[12:28] <Laurenceb> thats a pita for picoballoons
[12:28] <Laurenceb> but should be fine for 2ms integration i think
[12:31] <LeoBodnar> it should not be more than another 1000Hz
[12:32] <Laurenceb> thats not good
[12:32] <Laurenceb> needs ~<250hz to be simple to implement
[12:32] <Laurenceb> unless you do velocity estimation from last two positions
[12:33] <LeoBodnar> we assume velocity is constant or slowly changing
[12:33] <Laurenceb> yes
[12:34] <LeoBodnar> 437Hz doppler for 300km/h
[12:34] <Laurenceb> ok
[12:35] <Laurenceb> pico is unlikely to go faster than that
[12:35] <LeoBodnar> that's assuming movement to/from the sat
[12:35] <Laurenceb> and it wont be aligned straight like that, yeah
[12:35] <LeoBodnar> in reality we have slanted angle
[12:36] <Laurenceb> 2ms integration without velocity tracking will probably work then
[12:36] <LeoBodnar> so <=250 in 95% of the time
[12:36] <Laurenceb> might need TCXO tracking
[12:36] <Laurenceb> but thats somewhat easier
[12:37] <Laurenceb> might need to do a few iterations at sunset
[12:39] <LeoBodnar> sunset?
[12:39] <Laurenceb> rapid temperature changes
[12:39] <LeoBodnar> ah yes
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[12:40] <LeoBodnar> TCXO is specced to -30C only
[12:40] <Laurenceb> well 0.5ppm is ~780hz
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[12:41] <Laurenceb> i guess when its working, velocity is horizontal
[12:41] <Laurenceb> so there are only three annoying stateful variables to track
[12:41] <Laurenceb> velocity North,East and TCXO offset
[12:43] <LeoBodnar> yeah
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[12:44] <LeoBodnar> pico VS in freefall is ~10m/s that is 52Hz doppler in the worst case
[12:45] <Laurenceb> normally you could just do single acquisition
[12:45] <Laurenceb> otherwise start jumping up and down in doppler
[12:46] <Laurenceb> 4 or so new acquisitions should then allow rough but good enough TCXO, and very approximate velocity
[12:46] <Laurenceb> and closer velocity can then be calculated from changing position
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[12:46] <Laurenceb> i think youd need stm32f4/lpc with an fpu
[12:47] <Laurenceb> to run the libswiftnav code
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[12:50] <LeoBodnar> yeah looks like it
[12:50] <LeoBodnar> what sort of data is used in fft / ifft search?
[12:50] <LeoBodnar> considering it starts from 1-bit samples?
[12:51] <Willdude123> Geography lessons are boring
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[12:53] <Willdude123> Pfft
[12:53] <Willdude123> But IRC in a geography lesson is fasr more exciting
[12:56] <nats`> geography is an interesting topic
[12:56] <nats`> in fact everything can be interesting
[12:57] <hackvana> Everything is interesting until you're forced to study it.
[12:58] <Hix> Hi LeoBodnar - do you know if there are any reasonably priced clear potting compounds available? Want to pot an IR LED array for outdoor use
[12:58] <LeoBodnar> haven't dealt with potting yet Hix
[12:59] <Hix> ok
[13:00] <Laurenceb> bbl
[13:01] <Laurenceb> time to get back to work
[13:01] <Laurenceb> where work == trying to make i2c bus work
[13:03] <Laurenceb> i2c bus: the story of my life
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[13:07] <Chetic> how should I secure my rpi to the styrofoam?
[13:08] <PE2G> 326 km/h for the ozone sonde
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[13:28] <PE2G> I saw 364 km/h at 33 km. Exceptional.
[13:31] <DL1SGP1> Goedenmiddag PE2G, are you parsing the sonde-date to APRS?
[13:31] <PE2G> Gutenmittag DL1SGP1: yes
[13:32] <DL1SGP1> great, mind sharing the call/suffix?
[13:33] <PE2G> You want to track the sonde as well?
[13:33] <DL1SGP1> on the map, why not :)
[13:33] <PE2G> http://nl.aprs.fi/#!call=a%2FPE2G-11&timerange=10800&tail=10800
[13:34] <DL1SGP1> found it lol
[13:34] <DL1SGP1> bedankt jou well
[13:34] <DL1SGP1> it is close to me
[13:34] <PE2G> The sonde is on 403.900
[13:34] <DL1SGP1> dlet me tune it in then
[13:36] <DL1SGP1> hearing it
[13:37] <DL1SGP1> sounds like vaisala :)
[13:37] <PE2G> Correct, it's a Vaisala
[13:37] <PE2G> http://predict.habhub.org/#!/uuid=93e24606f81c91eec5811a139fe1c6959db1df33
[13:38] <PE2G> DL1SGP1: Are you near the predicted landing area?
[13:39] <PE2G> Just noticed that's it going further to the east than predicted
[13:39] <DL1SGP1> yes :P
[13:40] <DL1SGP1> gonna try to get my equipment calibrated to it
[13:41] <PE2G> It's in a slow descent, maybe some remains of the ballon work as an additional parachute
[13:42] <DL1SGP1> if it makes 75km further to the east it pretty much lands on my head :P
[13:42] <craag> remains of the balloon tend to cause faster descent if anything, as they're rather heavy.
[13:46] <PE2G> I saw -14 m/s at 22 km. Usuallly I don't see these ozone sondes descend so slow at that altitude.
[13:46] <DL1SGP1> also informed a sonde-hunter friend of mine who does not mind driving a bit more for finding "aliens" :)
[13:46] <PE2G> OK, there is a "Finderlohn"
[13:47] <DL1SGP1> yeah we have quite a hunt team out here, but they mostly track Meppen, Norderney and Bergen ... and Essen
[13:48] <DL1SGP1> not so much the radiosondes coming from abroad
[13:49] <PE2G> DL1SGP1: Do you know if they're on the German met-sonde forum?
[13:49] <DL1SGP1> I would assume so :)
[13:49] <DL1SGP1> there even were hunting area rivalities here :)
[13:50] <PE2G> Yes, alas it has come to that
[13:51] <DL1SGP1> yeah sad...
[13:51] <PE2G> Luckily, Meppen spits out at least 3 sondes a day and the other German stations 2
[13:52] <DL1SGP1> Bergen even more than that :) but we are too close to Bergen... and military makes additional starts here from the NATO training area near Bergen
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[13:53] <DL1SGP1> lately they were testing Graw's, which was good as the club recycled the gps modules from the radiosondes for the balloon project in July
[13:54] <eroomde> can't keep up with all the gps scrollback
[13:54] <eroomde> tell me if anything cool happens :)
[13:54] <eroomde> (i mean, it's all cool,but especially cool)
[13:54] <DL1SGP1> ok eroomde :)
[13:58] <PE2G> The Graws are nice, but they hardly ever land in my vicinity
[13:58] <Laurenceb> <LeoBodnar> what sort of data is used in fft / ifft search?
[13:59] <Laurenceb> 16bit fixed point should work
[13:59] <Laurenceb> but itll have to be bumped up a lot from single bit :P
[13:59] <Laurenceb> ill try 16bit fixed in my code
[13:59] <eroomde> ebay PSU arrived
[13:59] <eroomde> bit dissappointing, glad i didn't pay much for it
[14:00] <eroomde> i think this is all god's way of telling me i should build my own psu
[14:01] <nats`> picture ? :)
[14:02] <eroomde> one sec
[14:02] <eroomde> it turns out it has no current limiting
[14:02] <eroomde> and the low voltage supply is only 4-6V
[14:02] <eroomde> rather than 0-6V which i assumed
[14:03] <nats`> it's not a lab psu ?
[14:06] <eroomde> it is
[14:06] <eroomde> https://www.dropbox.com/s/k88jfnurs9umnmj/2014-01-23%2014.03.07.jpg
[14:08] <Laurenceb> http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Organic_Plutonium.jpg/220px-Organic_Plutonium.jpg
[14:13] <nats`> and it doesn't have current limit ? oO
[14:13] <nats`> that's weird for a lab psu
[14:15] <eroomde> yeah
[14:15] <eroomde> it is weird
[14:15] <eroomde> i'll keep it for when some double-sided thing just needs to sit there and run for ages
[14:16] <eroomde> some kinda piezo sensor calibration rig or something
[14:16] <eroomde> now i'm thinking about how to do my own PSU
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[14:31] <anerDev> hello =D
[14:31] <anerDev> anyone ? I need an information about balloon inflate
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[14:33] <gonzo__> what do you need to know? just post the question and someone will reply
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[14:35] <anerDev> if there is a tutorial for how put into the balloon the helium or hhydrogen
[14:36] <anerDev> if I need a flowmeter or other stuff
[14:36] <anerDev> I need this tutorial for the ignitor: http://ukhas.org.uk/guides:fill_tube
[14:37] <craag> ignitor is a bad idea
[14:37] <craag> The general idea is to attach a weight to the balloon, then weigh it and watch it's weight dissappear as the balloon starts to lift it.
[14:38] <gonzo__> the usual way is to fill cor a given lift. Attach a weaight to the neck of the balloon and inflate untill lift just matches the weight.
[14:38] <gonzo__> snap
[14:38] <craag> :)
[14:38] <gonzo__> (or should that be, pop?)
[14:38] <craag> :P
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[14:40] <anerDev> but for example my balloon need 3,5 m^3 of helium for going to 30k meters of altitude.
[14:40] <anerDev> So, how can I know if in the balloon there are 3,5 m^3 of gas ?
[14:42] <gonzo__> you work out how much lift 9in kg) that volume of gas will give, add the empty weight of the balloon, then attach a weight equal to that to the neck of the balloon.
[14:42] <craag> anerDev: http://habhub.org/calc/
[14:42] <gonzo__> when the balloon just starts to list the weight, you have enough gas
[14:42] <gonzo__> lift
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[14:44] <anerDev> thank you guys =D
[14:45] <LeoBodnar> just few more 6632s while they are still around for [almost] free
[14:45] <LeoBodnar> *get
[14:46] <anerDev> so, because the calc say that my balloon neck lift is 1733 g
[14:46] <LeoBodnar> are there WAAS sats up over Europe?
[14:47] <anerDev> I need a piece of material that the weight is 1733 g. If the balloon go up this pieces, the quantity of the gas is correct. this is correct ?
[14:52] <eroomde> LeoBodnar: have you bought them?
[14:52] <eroomde> oh you're asking me
[14:52] <eroomde> well, I have two already
[14:53] <eroomde> but i want a simple fanless thing with a knob for general quick bench use
[14:53] <anerDev> gonzo__ I need a piece of material that the weight is 1733 g. If the balloon go up this pieces, the quantity of the gas is correct. this is correct ?
[14:54] <LeoBodnar> I have two as well eroomde
[14:54] <LeoBodnar> you can shut down the fan for low current use
[14:55] <LeoBodnar> there was a menu setting somewhere in them
[14:55] <LeoBodnar> I also bought a PSU from Farnell and it is sh!t
[14:56] <LeoBodnar> I need something for the bench use. Digimess is small but crap, Agilent is great but big
[14:57] <craag> anerDev: What is you payload weight?
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[14:58] <LeoBodnar> Agilent has some small bench PSUs
[14:59] <anerDev> 900g
[14:59] <anerDev> craag
[14:59] <LeoBodnar> Annoyigly they have fixed input voltage and most of them are in the US
[14:59] <craag> anerDev: Ok, and you selected 5m/s ascent rate, and the balloon that you have?
[15:00] <mattbrejza> http://uk.farnell.com/aim-tti-pl-psu#lp-productRange eroomde ?
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[15:01] <mattbrejza> http://uk.farnell.com/aim-tti-instruments/el302r/psu-30v-2a/dp/1670779
[15:03] <anerDev> craag yes
[15:03] <craag> anerDev: Ok, in which case the 'neck lift' value is the lift that you want to get from your balloon when it's filled correctly.
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[15:04] <anerDev> payload: 900g - burst: 30k, hwoyee 1200, neck lift 4483g
[15:04] <LeoBodnar> TTI is a good company, I have a freq meter from them and it is very handy
[15:05] <craag> anerDev: That's a lot of neck lift, what ascent rate does it give you?
[15:05] <craag> (under Result)
[15:05] <anerDev> craag yes, is a test
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[15:07] <craag> a test flight? or just testing the calculator?
[15:07] <craag> It would be cheaper to put in less helium, and you'd go higher!
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[15:12] <LeoBodnar> eroomde: how big are sat clocks corrections?
[15:13] <anerDev> craag testing calculator
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[15:19] <craag> anerDev: Ah ok :) It's a great tool
[15:19] <craag> Along with the predictor
[15:22] <anerDev> thank you guys =D
[15:23] <eroomde> LeoBodnar: there's a lot on the space of small bench PSUs
[15:23] <eroomde> a load of uselessly crap chinese stuff
[15:23] <eroomde> wouldn't go near that
[15:23] <eroomde> but the old stuff is often quite good
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[15:49] <eroomde> mattbrejza: TTI stuff is nice but i don't really want to spend that
[15:50] <eroomde> I'd rather get an ebay steal for £50
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[15:50] <eroomde> any more serious electronics monies will go on a bench multimeter, but first more serious monies is going on house deposit
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[16:09] <mattbrejza> http://www.ebay.co.uk/itm/Thurlby-30V-2A-Variable-Workshop-Bench-DC-Power-Supply-PL320-/310834812324?pt=UK_Sound_Vision_Other&hash=item485f32d5a4
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[16:13] <SiC> ahh the good ol' pl320
[16:13] Action: SiC has one
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[16:21] <eroomde> mattbrejza: want it to be triple
[16:21] <eroomde> i suspect i'm going to end up doing DIY
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[16:21] <eroomde> 0-35V, 2A, x2, and a lower voltage higher current one
[16:22] <mattbrejza> you might get lucky with ebay
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[16:31] <eroomde> mattbrejza: yes
[16:32] <eroomde> the context is i didn't get lucky with ebay this morning
[16:32] <mattbrejza> ah i see
[16:33] <eroomde> it's ok, just not what i wanted
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[16:34] <eroomde> or rather, the description was a bit vague and i thought it was the triple version of a single one i already have and like
[16:34] <eroomde> turns out, it's not
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[16:44] <SiC> I did see a triple output of one of them the other day on ebay
[16:44] <SiC> I guess its gone now
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[17:07] <eroomde> gdb does a really annoying thing
[17:07] <eroomde> where if you a command wrong, it doesn't say ERROR: <usage>
[17:07] <eroomde> it just tells you the usage, but it's not always obvious that it's therefor rejected what you just said
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[17:37] <eroomde> there are so many PLLs onboard the stm32F4 that it's a shame you can't break some of them out to pins
[17:37] <Laurenceb> you kind of can
[17:38] <eroomde> you could get a nice LO for VHF and UHF comms
[17:38] <Laurenceb> theres MCO
[17:38] <Laurenceb> I was thinking about using it for haxored RF transmission
[17:38] <Laurenceb> yeah
[17:38] <eroomde> don't think that'll go above 50MHz though..,.
[17:38] <Laurenceb> yeah
[17:39] <eroomde> if it's for the MAC block right?
[17:39] <Laurenceb> (for 27Mhz band)
[17:39] <Laurenceb> yup
[17:39] <eroomde> might be thinking of the wrong pin
[17:39] <eroomde> oh right
[17:39] <eroomde> yep
[17:39] <eroomde> well, would do for HF i guess
[17:40] <Laurenceb> http://i.imgur.com/EjIdaQU.png
[17:40] <Laurenceb> ^why 200dps is a pita
[17:40] <Laurenceb> *2000
[17:40] <eroomde> what am i looking at?
[17:40] <Laurenceb> thats me whirling an lsm303 round my head on some cable
[17:41] <Laurenceb> 1 is full scale
[17:41] <Laurenceb> (and shaking so it tumbled chaotically)
[17:42] <Laurenceb> nice low noise tho
[17:42] <Laurenceb> can't even see it
[17:42] <LeoBodnar> is this paid work?
[17:42] <Laurenceb> yes lol
[17:42] <Laurenceb> its to go in an ECU
[17:42] <LeoBodnar> oh
[17:43] <eroomde> i fund 40x +/- 2G gyros in a box
[17:44] <eroomde> from a pile of old
[17:44] <eroomde> only info i could find on them was a guy selling them on ebay for £300 each
[17:44] <eroomde> but i can't really see if they're useful or not
[17:51] <Laurenceb> LeoBodnar: and management insist on it being based on the previous kit
[17:51] <Laurenceb> so utterly insane I2C down a cable
[17:51] <Laurenceb> whats been making me RAGE for some time now
[17:59] <eroomde> you can get decent i2c externder/isolators
[18:00] <Laurenceb> yeah
[18:00] <Laurenceb> but none on here as its already passed CE
[18:01] <Laurenceb> so hardware can't be changed
[18:02] <eroomde> bugger
[18:02] <eroomde> ECU's sound like a world of hurt
[18:02] <eroomde> like medical devices
[18:02] <eroomde> you basically seem to be attracted to embedded jobs that are as flair-precluding as possible
[18:03] <Laurenceb> heh
[18:03] <Laurenceb> well this is medically stuff
[18:03] <eroomde> ECU?
[18:03] <Laurenceb> its to go in ambulances
[18:03] <eroomde> oh
[18:03] <Laurenceb> to look at ride quality
[18:03] <eroomde> so it's an automotive-medical device
[18:03] <Laurenceb> yes
[18:03] <Laurenceb> i.e. horrifying
[18:03] <eroomde> how many lorrys did it take to deliver the safety regs it has to meet?
[18:04] <LeoBodnar> I2C in ECU sounds like a disaster in making
[18:04] <Laurenceb> heh
[18:04] <Laurenceb> Leobodnar: correct
[18:04] <LeoBodnar> ok hometime!
[18:04] <Laurenceb> the disaster already started, with hardware just on my desk :-/
[18:04] <Laurenceb> c u
[18:06] <Laurenceb> eroomde: when i was at SSTL they literally had a lorry to pick up their Galileo documentation
[18:06] <Laurenceb> 65k pages to be sent in paper form to 700 addresses
[18:07] <Laurenceb> articulated lorry and forklifts
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[18:17] <SpeedEvil> Laurenceb: 'Housed in a 5.4mm x 6mm package, Aster is integrated with ARM7 ESJ, Bluetooth 4.0/Bluetooth Low Energy, power management unit and memory (4Mbytes of flash and 4Mbytes of SRAM). MediaTek is pitching it as the "smallest SoC" with "highest integration" for wearables.'
[18:17] <SpeedEvil> And here I was thinking that 'linux in a qfn32' that I've been going on about was still a few years off.
[18:18] <Laurenceb> nice
[18:18] <Laurenceb> but ARM7
[18:18] <SpeedEvil> Well - yes.
[18:18] <eroomde> Laurenceb: this is why you shouldn't work on ESA projects
[18:18] <SpeedEvil> I wasn't specifically meaning for your thing.
[18:18] <SpeedEvil> Laurenceb: this is for cases when you can't really afford seperate ROM,RAM, or POP
[18:19] <Laurenceb> eroomde: ~95% of pages said "N/A"
[18:19] <Laurenceb> SpeedEvil: yeah its nice
[18:19] <Laurenceb> is the a datasheet?
[18:19] <SpeedEvil> hhahhahahahahahahah
[18:19] <SpeedEvil> Mediatek
[18:20] Action: SpeedEvil sighs.
[18:20] <Laurenceb> wtf ubuntu
[18:20] <Laurenceb> why would i want to open a csv with freecad
[18:22] <SpeedEvil> I suppose CSV _could_ be a pointcloud
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[18:40] <eroomde> there is room in the world for a 'write an openOCD config script from scratch' tutorial
[18:40] <eroomde> is the moral of my day
[18:41] <Laurenceb> really?
[18:41] <Laurenceb> where?
[18:41] Action: Laurenceb uses st-link purely to avoid openocd
[18:41] <eroomde> i shall probably not be that person, though, given i haven't even got round round to putting my gps talk stuff online, despite already writing it during the talk
[18:41] <Laurenceb> oh nvm
[18:41] Action: Laurenceb comprehension fail
[18:42] <eroomde> anyway nvm, have have blinkenlights and what looks like an ethernet packet emanating from this new board
[18:42] <eroomde> so that counts as good enough for today
[18:42] <SpeedEvil> Woo!
[18:42] <Laurenceb> nice
[18:42] <eroomde> i'm not sure it's a valid UDP packet, i'll play with tcpdump tomorrow
[18:42] <eroomde> cba to get into it now
[18:42] <eroomde> drink time
[18:43] <LeoBodnar> is EGNOS active?
[18:43] <arko> dooittt
[18:43] <eroomde> (and this is why i shall never be a leet hacker)
[18:43] <eroomde> arko: yo
[18:43] <arko> sup dude
[18:43] <Laurenceb> LeoBodnar: was laft time i checked
[18:43] <eroomde> i saw you on the hackaday vid
[18:43] <arko> i should hold you from drinks
[18:43] <arko> oh yeah ;)
[18:43] <eroomde> you seem to be wasting away
[18:43] <arko> i am?
[18:43] <eroomde> either that or aspect ratio during transcoding
[18:44] <LeoBodnar> Laurenceb: WAAS can be great as it is geostationary
[18:45] <gonzo_nb> if I had all the money I'd spent on drink... I'd spend it on drink.
[18:45] <Laurenceb> hmm
[18:45] <Laurenceb> i didnt think of that one
[18:45] <eroomde> arko: all well anyway?
[18:46] <Laurenceb> yeah, I'm not sure what data it transmits
[18:46] <arko> yeah man
[18:46] <Laurenceb> does it have almanac?
[18:46] <arko> all good
[18:46] <arko> except our lease is out and the owner is kicking us out of our space
[18:46] <LeoBodnar> i suppose it has
[18:46] <arko> so we have less than a month to raise $10k
[18:46] <arko> yay...
[18:46] <eroomde> arko: nullspace?
[18:46] <LeoBodnar> they are used for nav fix solution
[18:46] <arko> yeah
[18:46] <eroomde> ouch
[18:46] <arko> same day that video was posted
[18:46] <DL1SGP> yikes
[18:46] <arko> timeing...
[18:46] <arko> timing*
[18:47] <LeoBodnar> it transmits standrad PRN stuff
[18:47] <arko> other than that im enjoying my digital signal processing class and things
[18:48] <eroomde> i imagine there are some ppl in your space for whom that money could probably appear without being missed too much
[18:48] <LeoBodnar> Currently the signal broadcast by the EGNOS satellites AOR-E (PRN120) and the IOR-W (PRN 126) is used for EGNOS Operations and the ESA ARTEMIS satellite (PRN 124) is currently used by Industry to perform various tests on the system.
[18:48] <eroomde> a day's consulting on the side...
[18:48] <eroomde> what's the DSP class like?
[18:48] <arko> yeah, but such a short notice is rough
[18:48] <arko> its a lot to ask for really
[18:48] <eroomde> done all the tustin/bilinear transform stuff yet?
[18:48] <arko> but we have had a lot and i mean a lot, of people use the space
[18:49] <arko> the space has given a lot, so its time for the community to kick in and help
[18:49] <eroomde> you have my bow
[18:50] Action: arko nods
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[18:50] <Laurenceb> LeoBodnar: ill see if i can find it with the aquisition code
[18:50] <Laurenceb> later, time to head home now :P
[18:51] <arko> eroomde: im being asked to give a talk at layerone and im half tempted to do a gps talk.. either that or RFID
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[18:51] <arko> still a lot to learn on the gps end
[18:53] <eroomde> i have lots of ideas about GPS-based attacks
[18:54] <arko> :D
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[18:54] <arko> i was thinking about including a tad bit of history and how it was meant to be "invisible"
[18:54] <arko> etc etc
[18:55] <cm13g09> has anyone heard about the fun in London this evening?
[18:55] <LeoBodnar> GPS seems as secure as TCP. Gentlemen's system.
[18:55] <SpeedEvil> Quite.
[18:56] <SpeedEvil> It's comedically trivial to take a broadcast position from a vehicle - and your position, and walk it off target.
[18:57] <SpeedEvil> Unless there is actual specific jam detection in there.
[18:57] <daveake> not heard anything concrete
[18:57] <cm13g09> daveake: Boom Boom!
[18:57] <SpeedEvil> I imagine you could trivially sell GPS replay devices that output a fixed wander around a small area for 5K, to the right people.
[18:59] <fsphil> that was a solid pun
[18:59] <LeoBodnar> The EGNOS system transmits its messages over band L1 (1575.42 MHz) at a rate of 250 bits per second. It uses the same modulation as GPS, but at a transmission rate five times higher. The size of every message transmitted is 250 bits, which enables one message to be trans- mitted per second.
[18:59] <daveake> we're all set now
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[18:59] <cm13g09> daveake: yeah, there's concrete proof it's happened too :P
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[19:00] <fsphil> they really broke the mold
[19:00] <fsphil> mould?
[19:00] <fsphil> gah
[19:01] <daveake> concrete of london ... wonder how that compares to plaster of paris
[19:02] <mfa298> I didn't think you were allowed to get stoned on the tube.
[19:03] <fsphil> nothing is set in stone
[19:05] <eroomde> cm13g09: what's happened in london?
[19:06] <daveake> http://londonist.com/2014/01/victoria-line-closed-due-to-flooding-at-victoria.php
[19:06] <fsphil> an "oops" moment
[19:07] <eroomde> oh god
[19:07] <eroomde> that's going to be expensive
[19:07] <eroomde> all my brixton friends are going to be delighted
[19:07] <daveake> yup
[19:11] <Reb-SM3ULC> daveake: so nice to clean that up...
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[19:11] <Lunar_Lander> hello
[19:12] <nats`> mouarf nice one daveake
[19:12] <nats`> who forgot the concrete bag :D
[19:16] <mikestir> blimey have you seen the other pics
[19:17] <mikestir> what a mess!
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[19:18] <mfa298> that's not going to be fun to sort out and one of the times you really can't sit down to plan how you're going to sort it first.
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[19:22] <nats`> powerfull pump
[19:22] <nats`> that's the only solution I think
[19:22] <nats`> you have some bivalve model for concrete and other semi fluid
[19:22] <SpeedEvil> Sheeet.
[19:23] <SpeedEvil> Well.
[19:23] <SpeedEvil> It does rather depend on if you get to it in the right 15 minutes.
[19:23] <SpeedEvil> Otherwise it changes somewhat.
[19:23] <mfa298> main point is that in this case you want to act fairly quickly before it sets solid
[19:24] <nats`> ohh it's a quick concrete
[19:24] <mfa298> if it's solid you could afford to spend some time working out how to fix it
[19:24] <nats`> good luck :p
[19:24] <Reb-SM3ULC> mfa298: just add more water.. but still not so fun to pump gravel...
[19:24] <nats`> Reb-SM3ULC not even sure that will work
[19:24] <SpeedEvil> It won't.
[19:24] <Reb-SM3ULC> nats`: right, if its too thick..
[19:24] <nats`> following my father there are many concrete that can become solid under water
[19:24] <SpeedEvil> It's quick-setting concrete - used to fill voids.
[19:25] <SpeedEvil> nats`: Concrete never, ever sets by drying out.
[19:25] <Reb-SM3ULC> ouch
[19:25] <daveake> so, on aggregate, they're stuffed
[19:25] <SpeedEvil> It's quick swtting concrete used to fill voids. It will be set within a couple of hours.
[19:25] <SpeedEvil> Perhaps sooner.
[19:26] <SpeedEvil> SO you're basically reduced to throwing away all the control gear inside teh concrete.
[19:26] <fsphil> someone may soon receive a pair of cement shoes
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[19:27] <daveake> his life has gone down the tubes
[19:27] <fsphil> to be fair they should have known it was a bad idea to hire a Mr. J.Bieber
[19:28] <nats`> SpeedEvil my father say me it's already arrived in Paris
[19:28] <nats`> when he worked for a company doing conrete injection to fill old mine under the subway
[19:29] <nats`> apparently if it's the concrete they used it takes 15 minutes to become a mess to remove
[19:30] <SpeedEvil> yeah.
[19:30] <SpeedEvil> The stuff sets fast for a reason.
[19:31] <nats`> so basically this subway line is dead for weeks I think
[19:31] <daveake> Presumably passengers are being asked to use the blue circle line
[19:31] <cm13g09> lol
[19:31] <SpeedEvil> :)
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[19:32] <nats`> imagine you're screwed in that...
[19:32] <nats`> I don't imagine the burn you'll feel on the skin
[19:32] <nats`> I put once my hand in concrete
[19:33] <nats`> that was a bad experience
[19:33] <SpeedEvil> It may actually get quite hot
[19:35] <cm13g09> SpeedEvil: yep
[19:35] <cm13g09> I'm supposed to be meeting one of the station controllers from Victoria tonight....
[19:35] <cm13g09> I suspect he's either gone off shift and left it all behind
[19:35] <cm13g09> or is running around like a blue-arsed fly!
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[19:49] <chrisstubbs> Anyone use NI multisim?
[19:51] <zyp> I remember using multisim in school, almost ten years ago
[19:52] <eroomde> Laurenceb: http://i.imgur.com/Ry1Ht69.jpg
[19:52] <eroomde> blast from the hab past
[19:52] <chrisstubbs> It probably hasnt improved
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[20:13] <eroomde> http://www.youtube.com/watch?v=yg3h_GuUbuQ
[20:13] <eroomde> fun
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[20:25] <arko> Hey guys, our hackerspace needs some help, sorry the indiegogo isnt full of too much content yet but we will get more info soon
[20:25] <arko> Nullspace Labs needs your help! As some of you already know we were informed on January 21st by our landlord that our building is going to be gutted and remodeled in March. The news came to us so suddenly that we now face a very small time window to react. We need to be out of the building by Feb 23rd. Help by donating here!! http://igg.me/at/helpnsl/
[20:25] Willdude123_ (~Willdude1@unaffiliated/willdude123) left irc: Ping timeout: 252 seconds
[20:26] <arko> any help will be most appciated
[20:28] <Steve_mirc_2e0ve> in eagle how do you update the board if you remove something off of the schematic
[20:28] <eroomde> it should happen automatically Steve_mirc_2e0ve
[20:28] <eroomde> if it doesn't happen automatically, it'd badness-one-million
[20:29] <eroomde> have you checked that it definitely is still on the layout but not the schematic?
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[20:30] <chrisstubbs> Steve_mirc_2e0ve, Is the light in the bottom right corner green or pink?
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[20:31] <eroomde> and do you get / have you had any warning messages along the lines for an inconsistancy between schematic and layout?
[20:31] <eroomde> goodbye everone
[20:32] <fsphil> wee
[20:32] <eroomde> not too bad
[20:32] <eroomde> it's usually
[20:32] <Steve_mirc_2e0ve> light is green, but i havent removed it yet. I want to remove it to get rid of a load of air wires (its the ISP HEADER), track the board then add it at the end
[20:32] <eroomde> quite: bob, michael, sally, + 108 more
[20:33] <eroomde> Steve_mirc_2e0ve: just delete it from the schematic
[20:33] <eroomde> should automatically disappear from layout
[20:33] <Steve_mirc_2e0ve> ok thanks
[20:33] <eroomde> if there any any random airwires and crap remaining, hit 'ratsnest'
[20:33] <eroomde> that should re-calculate them all (and thus get rid of any leftover ones to nowhere)
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[20:59] <arko> jcoxon: was that you?
[21:01] <jcoxon> yup
[21:01] <arko> :) YOU ROCK MAN!
[21:01] <jcoxon> its no problem
[21:01] <jcoxon> you guys do cool stuff
[21:01] <jcoxon> glad to help
[21:01] <arko> :) thanks man!
[21:01] <jcoxon> when i visit...
[21:01] <arko> http://igg.me/at/helpnsl/ for others wondering
[21:01] <arko> jcoxon: i will buy you drinks when you do
[21:02] <jcoxon> arko, helen and i will vist california one day
[21:02] <jcoxon> :-)
[21:02] <arko> yes!
[21:02] <arko> i look forward to it
[21:03] <arko> hopefully i'll have my own place to host like you guys did for me
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[21:04] <jcoxon> hehe
[21:05] <chrisstubbs> arko, get hackaday to put a link up to that
[21:06] <eroomde> yeah
[21:06] <arko> we are talking about this right now
[21:06] <arko> :)
[21:06] <arko> lots of people there
[21:07] <Laurenceb_> LeoBodnar: the averaging works as its just pruned FFT by another name
[21:08] <eroomde> Laurenceb: did you see the photo?
[21:09] <arko> chrisstubbs: very generous man!
[21:09] <arko> next time you're in LA i'll give you a tour of the space :)
[21:09] <Laurenceb_> eroomde: photo of what?
[21:09] <chrisstubbs> Haha Im sure I will visit the US again one day...
[21:10] <arko> :) cool man
[21:10] <arko> thanks
[21:10] <chrisstubbs> Good luck, its a fair bit of money you guys have to raise
[21:10] <arko> every dollar will help
[21:10] <chrisstubbs> do you have like a lottery fund you can apply for as a charity or anything?
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[21:10] <arko> we are working on becoming nonprofit
[21:10] <arko> soon
[21:10] <arko> we also picked the "give us the money anyway" option, so if we dont hit the goal we still get the money
[21:11] <fsphil> don't think you'll have a problem hitting it
[21:11] <arko> i still worry
[21:11] <arko> $10k is a lot of money
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[21:23] <mikestir> bah. why does it rain all the time
[21:23] <mikestir> I need some decent rigging weather
[21:24] <arko> come to los angeles
[21:24] <arko> its 22C and clear skys
[21:24] <mikestir> yeah or anywhere in the us really, where I could have two 30m pump up towers in my "back yard" :)
[21:24] <arko> why not!
[21:25] <arko> land of the free
[21:25] <arko> home of the whopper!
[21:25] <eroomde> mikestir: what are you rigging?
[21:25] <mikestir> hf antenna
[21:25] <mikestir> to use with the now reasonably functional 706
[21:26] <mikestir> I ended up with about 7W on all bands
[21:30] <mikestir> actually I probably need to go to the tip first in order to extricate the ladder from the garage
[21:32] <Reb-SM3ULC> arko: up to nice -6C here.
[21:32] <arko> haha
[21:32] <fsphil> nice
[21:32] <Reb-SM3ULC> arko: father in law just dropped in. had -32 last night in their cabin.
[21:33] <arko> yikes!
[21:33] <arko> hab temperatures
[21:33] <Reb-SM3ULC> well, normal temps are about -20C this time of year
[21:34] <Reb-SM3ULC> colder in the nothern parts, about -40 not unusual
[21:34] <arko> wow man
[21:34] <arko> thats crazy
[21:34] <eroomde> right going
[21:34] <eroomde> gnight
[21:34] <fsphil> nites
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[21:35] <Reb-SM3ULC> arko: you notice if your car-battery is out of shape.. :)
[21:37] <Laurenceb_> http://www.dragoninnovation.com/projects/32-pulsedlight-single-board-range-finder-minimodule
[21:37] <Laurenceb_> what the heck
[21:39] <Laurenceb_> either a scam or very smart
[21:40] <Laurenceb_> in which case why would they be crowdfunding...
[21:46] <Laurenceb_> aha http://www.google.ca/patents/US8125620
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[21:59] <Laurenceb_> LeoBodnar: the averaging works as its just pruned FFT by another name
[22:00] <Laurenceb_> for the gps
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[22:02] <LeoBodnar> heh
[22:02] <LeoBodnar> nice
[22:02] <LeoBodnar> have you tried EGNOS PRNs?
[22:02] <LeoBodnar> http://www.losangeles.af.mil/shared/media/document/AFD-101124-042.pdf
[22:04] <Laurenceb_> not yet, cooking
[22:04] <Laurenceb_> bbl
[22:06] <LeoBodnar> nice
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[22:42] <fsphil> arko: over 10% already
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[22:48] <chrisstubbs> Wow, thats awesome :D
[22:51] <Laurenceb_> LeoBodnar: I tried the rest of that recording
[22:51] <Laurenceb_> i saw 3 def signals
[22:51] <Laurenceb_> maybe 5
[22:51] <Laurenceb_> with 2ms
[22:52] <LeoBodnar> which PRNs?
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[22:53] <LeoBodnar> you mean 5 sats?
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[22:54] <Laurenceb_> 24, 28,30,32
[22:54] <Laurenceb_> and 5
[22:54] <Laurenceb_> yes
[22:54] <Laurenceb_> im confused
[22:54] <Laurenceb_> i thought there were only 32 valid PRN cpdes
[22:55] Action: Laurenceb_ checks his stolen PRN code again
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[22:56] <LeoBodnar> they are "allocated" but you can generate 1000 PRNs using different G2 delay
[22:57] <Laurenceb_> yeah
[22:57] <LeoBodnar> that's what I am doing now
[22:57] <Laurenceb_> my prn code can only do 32
[22:57] <Laurenceb_> theres no "tap" defined
[22:58] <LeoBodnar> scanning the signal with PRNs generated by sweeping G2 delay from 0 to 1200 to see if I can fish something else out
[22:58] <Laurenceb_> oh wait
[22:58] <Laurenceb_> 1-37
[22:58] <Laurenceb_> whats the EGNOS PRN?
[22:58] <Laurenceb_> aha 1230
[22:58] <Laurenceb_> oops 120
[22:59] <Laurenceb_> i see - all the info is in the pdf
[22:59] <LeoBodnar> 120 124 126
[23:00] <Laurenceb_> would help if i understood how the shift registers worked :P
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[23:02] <LeoBodnar> lol they barrel-shift stuff
[23:07] <Laurenceb_> so there are two tap variables and two initialisation values for each PRN?
[23:08] <chrisstubbs> Anyone signed up for NavSpark?
[23:09] <Laurenceb_> http://www.colorado.edu/geography/gcraft/notes/gps/gif/cagenera.gif
[23:09] <Laurenceb_> ah i see
[23:09] <LeoBodnar> yeah but init values depend on the delay
[23:09] <Laurenceb_> blerg
[23:09] <LeoBodnar> let me find the code
[23:09] <Laurenceb_> how far have you got?
[23:09] <Laurenceb_> im lazy :p
[23:11] <LeoBodnar> http://read.pudn.com/downloads120/sourcecode/others/511876/sofGPS/include/generateCAcode.m__.htm
[23:12] <LeoBodnar> the only input value for each PRN is the delay
[23:12] <Laurenceb_> ooh cool, thanks
[23:15] <Laurenceb_> now ive forgotten what im doing..
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[23:20] <Laurenceb_> error: number of columns must match (19 != 32)
[23:20] <Laurenceb_> funtimes
[23:20] <Laurenceb_> at some point its faster to write in c
[23:24] <Laurenceb_> tho mainly as Octave != Matlab
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[23:27] <Laurenceb_> ok it runs for PRN<32
[23:27] <Laurenceb_> ill test for EGNOS
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[23:29] <LeoBodnar> http://www.navipedia.net/index.php/SBAS_Fundamentals SBAS Data 500 symbols per second, module-2 modulated (250 effective bits per second)
[23:29] <LeoBodnar> what does this mean?
[23:29] <LeoBodnar> how many PRNs are expected to have the same phase?
[23:30] <LeoBodnar> 2 or 4?
[23:35] <Laurenceb_> maybe they mean Manchester encoded
[23:35] <Laurenceb_> i think 2
[23:35] <Laurenceb_> hmm i dont see anything
[23:35] <Laurenceb_> seems to be working tho
[23:35] <Laurenceb_> just noise
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[23:37] <LeoBodnar> ok
[23:37] <LeoBodnar> so yo can correlate for +PRN +PRN -PRN -PRN ?
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[23:38] <LeoBodnar> as each 2 ms there is a guaranteed transition
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[23:57] <LeoBodnar> I think I am seeing PRN 125
[00:00] --- Fri Jan 24 2014