highaltitude.log.20101013

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[07:30] <Laurenceb> hi
[07:30] <Laurenceb> main branch of fldigi gives me the same error
[07:41] <Laurenceb> ill email the main dev guys
[07:58] <m1x10> good morning
[08:42] <m1x10> from the scope, seems that the 300mW at every place in my home sounds the same loud.
[08:43] <m1x10> while I get external signals from other stations whom's peak is about 0.1v
[08:44] <m1x10> the peak of my signal is 1v
[08:47] <m1x10> http://imagebin.org/118273 , http://imagebin.org/118274
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[08:49] <timbobel> hello hello!
[08:50] <juxta> heya timbobel
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[09:14] <m1x10> hi timbobel
[09:20] Laurenceb_ (~Laurenceb@server.nowhere-else.org) joined #highaltitude.
[09:20] <Laurenceb_> hi
[09:32] <timbobel> i btw i lit my arduino mega on fire
[09:32] <timbobel> well it did that itself but ok
[09:32] <Darkside> :/
[09:32] <Darkside> how the hell did you manage that
[09:32] <timbobel> put 12v on Vin and Gnd, wrong way around =)
[09:32] <Darkside> ahhhhh
[09:32] <Darkside> bad
[09:33] <timbobel> and the capacitor will lit up like the 4th of july
[09:33] <Darkside> it'll be hard to get the smoke back in now :(
[09:33] <timbobel> i tried sucking it up
[09:33] <timbobel> the only thing that gave me was a headache
[09:33] <timbobel> no but actually, everything still works, i just desoldered the capacitor.
[09:37] <Darkside> might want to put a new one in
[09:37] <Darkside> just in case you need power filtering
[10:01] <fsphil> ah man, predictions for this weekend are getting worse
[10:06] <m1x10> fsphil, as winter approaches you should expect worse winds
[10:07] <Laurenceb_> fsphil: i tried the standard distribution of fldigi
[10:07] <Laurenceb_> same issues, ive emailed the dev adress
[10:17] <fsphil> yea didn't think it was something we'd changed -- did you get a backtrace from gdb?
[10:18] <fsphil> m1x10, yep - they're just at the wrong strength and direction now. a bit stronger and it might make it to Wales
[10:20] <Laurenceb_> fsphil: yeah i ddid but just the same info
[10:20] <Laurenceb_> fonts crashing
[10:21] <GW8RAK> fsphil, are you still launching this weekend?
[10:22] <Laurenceb_> hmm if i can get fldigi working id come along to try chipcon sdr for rx
[10:23] <fsphil> GW8RAK, only if the predictions improve
[10:23] <Laurenceb_> what are you flying?
[10:24] <GW8RAK> Okay. It's been sometime since a launch and didn't want to miss it.
[10:24] <fsphil> GW8RAK, and whichever day it doesn't land in the sea ;)
[10:24] <fsphil> fairly basic payload, canon a560 and transmitting the live images
[10:25] <GW8RAK> If it does, I've got a flight in a Sea King on Saturday from RAF Valley. An expensive recovery?
[10:25] <fsphil> haha, now that would be epic!
[10:27] <fsphil> Saturday prediction: http://habhub.org/predict/#!/uuid=39cbe44abe27ac3c05697379bb942000bed56a77
[10:28] <GW8RAK> A bit of an aquatic landing.
[10:28] <fsphil> and if I underfill it: http://habhub.org/predict/#!/uuid=f04ce57f546dd901e7f4ea79d147a9a32063f896
[10:29] <GW8RAK> A bit closer to North Wales and I'll pick it up.
[10:30] <fsphil> if it showed it landing on solid ground I'd definitely consider it
[10:30] <GW8RAK> But for future reference, I have people in Mid Wales who would happily recover the payload for you.
[10:32] <Darkside> hmm i might reflow my board
[10:32] <Darkside> as in, re-flow the solder joints on it
[10:34] <Darkside> try and stop some of ht ecorrision at the tri-metal junctions
[10:35] <fsphil> the board still corroding?
[10:35] <Darkside> well, it doesnt look too good
[10:35] <Darkside> i'm probably going to have to re-create it eventually
[10:35] <Darkside> but for the moment i'll just re-do the solder joints
[10:36] <fsphil> you got a reflow oven?
[10:36] <Darkside> no
[10:36] <Darkside> i'll just melt each joint with a soldering iron
[10:40] <Laurenceb_> GW8RAK: you're in ther raf or something?
[10:41] <Darkside> also going to go over some of the solder joints, as i cut the excess wire off after i soldered
[10:41] <Darkside> i should have cut the wire before i soldered, so i don't leave an opne core of copper
[10:44] <fsphil> yea I've often wondered about that, though its easier to solder with the longer wire
[10:46] <Darkside> i've had three engineers say to cut before soldeirng now :P
[10:46] <Darkside> so i'm goign tof follow their advice from now on :P
[10:46] <GW8RAK> Laurenceb - no just with the Air Cadets. Our balloon is a squadron project.
[10:46] <Darkside> anyway, SGU time
[10:46] <GW8RAK> Progress on the software was slow over the summer, but it's almost finished now.
[10:47] <GW8RAK> Just need to bring all the hardware together and then start nagging the CAA for a response to questions.
[10:48] <Laurenceb_> ah neat
[10:49] <GW8RAK> I've asked them to consider a launch site in North Wales, but no response yet after 4 months.
[10:49] <GW8RAK> And we really don't want to go all the way to Cambridge.
[10:49] <GW8RAK> Used to live there and don't like flat countryside anymore.
[10:49] <fsphil> did you submit a notam request?
[10:50] <GW8RAK> Not yet, it was just a general question about launching over here.
[10:50] <GW8RAK> I suppose that a Notam request may focus their minds a bit more.
[10:50] <fsphil> yea might be better just to make the request
[10:51] <GW8RAK> Around here is definitely out, too close to Liverpool and Manchester, but further West should be okay. Do they worry about transit over air corridors or just where the launch site is?
[10:51] <fsphil> took them a week to tell me how long in advance I should request the notam
[10:51] <fsphil> (answer was six weeks btw)
[10:51] <GW8RAK> Right, that's it. I'll send in a Notam this week.
[10:53] <GW8RAK> But I may give them a couple of locations to consider.
[10:53] <fsphil> different locations will need separate requests
[10:54] <fsphil> but multiple launches from the same place only need the one
[10:56] <Laurenceb_> fsphil: looks like i need to update my ubuntu installation
[10:57] <Laurenceb_> theres binarys in the repo of newer ubuntus
[10:57] <Laurenceb_> wheras mine is old
[10:58] <Laurenceb_> - 8.04 is still supported but for some reason the ydidnt upodate fldigi - im guessing as theres some annoying bug
[10:58] <Laurenceb_> as its been updated on every more recoent build
[11:00] <fsphil> yea, the package maintainer probably give up on 8.04
[11:01] <Laurenceb_> theres a amd64 binaries for everything >8.04
[11:02] <Laurenceb_> i need to up[date anyway so thats not the end of the world
[11:02] <Laurenceb_> wondered why i had such an old version
[11:02] <Laurenceb_> of fldigi
[11:06] <Laurenceb_> http://losinggeneration.homelinux.org/2010/07/02/msp430-launchpad-on-linux/ <- nice
[11:10] <Darkside> yes, you have 128b of ram :P
[11:11] <Laurenceb_> heh
[11:11] <Laurenceb_> i like the fact you can get QFN16 with 16bit adc and pga
[11:12] <Darkside> what sample rate on teh ADC?
[11:12] <Laurenceb_> trying to work that out atm :P
[11:12] <Darkside> lol
[11:12] <Laurenceb_> its sigma delta
[11:12] <Darkside> its not in the datasheet?
[11:12] <Laurenceb_> so you can lower the oversampling ratio
[11:12] <Laurenceb_> but you start to lose bits
[11:12] <Darkside> aww
[11:12] <Laurenceb_> its not a simple equation
[11:13] <Darkside> so its not a real ADC then :P
[11:13] <Laurenceb_> and depends on the pga gain setting
[11:13] <Darkside> or did you mean DAC before
[11:13] <Laurenceb_> heh
[11:13] <Laurenceb_> no
[11:16] <Laurenceb_> looks like about 10ksps
[11:17] <Darkside> aww
[11:17] <Darkside> well thats crap
[11:17] <Laurenceb_> tho i could be wrong...
[11:17] <Laurenceb_> datasheet is all over the place
[11:17] <Laurenceb_> info for about 8 devices on one sheet
[11:17] <Darkside> my xmega does 2Msps on the ADC :P
[11:17] <Laurenceb_> yeah but how many bits?
[11:17] <Darkside> well, ideally 12...
[11:17] <Darkside> but its more like 10-11
[11:18] <Laurenceb_> yeah 10ksps before you start to go below 16 bits
[11:18] <Darkside> mm
[11:18] <Darkside> i also have a 1Msps DAC
[11:19] <Darkside> 12-bit
[11:19] <Laurenceb_> xmegas actually exist?
[11:19] <Darkside> yes
[11:19] <Darkside> lol
[11:19] <Laurenceb_> /jk
[11:20] <Darkside> grr
[11:20] <Darkside> they're awesome :P
[11:20] <Darkside> overpowered for my application, but still awesome
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[11:20] <Laurenceb_> i need to interface with a photodiode
[11:20] <Laurenceb_> with a very small board - 8mm diameter
[11:21] <Laurenceb_> msp430 is thew only micro i can find that fits the bill
[11:21] <Darkside> thats tiny
[11:21] <Laurenceb_> i can fit an msp430 and a st accel
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[11:21] <Laurenceb_> and have it talk over i2c
[11:29] <Laurenceb_> https://help.ubuntu.com/community/LucidUpgrades
[11:29] <Laurenceb_> thats nice - direct upgrade from 8.04 to 10.04
[11:42] <m1x10> fsphil, I got the camera :)
[11:43] <m1x10> and microSD shield :)
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[11:47] <fsphil> fantastic m1x10, what sort of size is it?
[11:49] <m1x10> let me picture it
[11:52] <m1x10> http://imagebin.org/118289
[11:53] <fsphil> not far of the sparkfun camera, but with a lens instead of the pinhole
[11:53] <m1x10> we will see
[11:54] <m1x10> the chip is very diff of that of sparkfun
[11:54] <m1x10> we will see
[11:54] <m1x10> first i need to do the microSD code
[11:54] <m1x10> so I can save images later
[11:55] <m1x10> then do the camera
[11:56] <m1x10> the fat16 arduino lib works great.
[11:56] <m1x10> already wrote a file under fat16 :P
[11:57] <Darkside> mm
[11:57] <Darkside> im looking at porting all that stuff to the xmega
[11:58] <Darkside> will have to re-write all the SPI stuff
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[12:03] <fsphil> is there a good library for fat/sd card writing for avr? (not arduino)
[12:04] <m1x10> dunno
[12:04] <m1x10> why that lib shouldnt be suitable ?
[12:04] <fsphil> what lib?
[12:05] <Darkside> fsphil: its surprisingly easy to get ardino librarirs working with plain avr-g++
[12:05] <Darkside> well, you need to replace all the digitalWrite crap
[12:05] <Darkside> but the underlying SPI stuff is basically the same
[12:06] <fsphil> mm, might try that
[12:06] <fsphil> it looks so trivial to wire up an sd card
[12:11] <m1x10> try it
[12:11] <fsphil> think I might -- would be nice to have a complete log
[12:15] <m1x10> :p
[12:16] <m1x10> I know that I have just added a 1GB logging facility in my main system :)
[12:18] <fsphil> not likely to run out quickly ;)
[12:18] <fsphil> though if you capture plenty of jpeg's
[12:19] <timbobel> what should i use on a atmega oscillator
[12:20] <timbobel> 22pf or 0.1uf
[12:20] <timbobel> i put 0.1uf on just now but i thought it was 22
[12:20] <fsphil> if it works, keep it
[12:20] <fsphil> I didn't use any
[12:21] <timbobel> ive seen p eople do that yeah
[12:23] <m1x10> timbobel 22p
[12:25] <timbobel> the question was would it matter
[12:25] <m1x10> i know it as 22p at least
[12:30] <fsphil> (from googling) the choice of capacitor is determined by the crystal, check the datasheet
[12:32] <timbobel> cock
[12:33] <Laurenceb_> grow up
[12:33] <fsphil> but if it's working, you'll be fine
[12:33] <fsphil> I don't think it's that important
[12:33] <timbobel> ill try
[12:37] <timbobel> loader says its not in sync ill go for the 22p
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[12:40] <m1x10> lol
[12:40] <m1x10> this library is so easy
[12:40] <m1x10> file.write(data);
[12:40] <m1x10> data=a string
[12:41] <m1x10> I will take back that words about implementing raw byte write
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[12:56] <m1x10> oh
[12:56] <m1x10> http://www.nasa.gov/multimedia/isslivestream.asx
[12:56] <m1x10> look :P
[12:57] <Darkside> hmm whats this
[12:57] <Darkside> what are they doing
[12:58] <m1x10> :p
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[13:33] <earthshine> Any of you guys receive your own satellite data ?
[13:43] Action: SpeedEvil looks at his GPS.
[13:53] <GW8RAK> earthshine - do you mean as in amateur radio? Voice repeater and telemetry?
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[13:58] <DanielRichman> Laurenceb: re http://pastebin.com/em07GxnQ, if you type (gdb) bt you get the stacktrace, bt full gives more informations
[14:07] <Laurenceb_> oh right
[14:07] <Laurenceb_> not got acess to my machine atm
[14:15] <DanielRichman> the other semi-useful commands are 'l' and 'up'
[14:16] <DanielRichman> I forget what l is short for but if it can find teh source code it shows you the context around teh current line
[14:16] <DanielRichman> up jumps up one stack frame so you can do the above for the "next" function
[14:16] <DanielRichman> and finally the print <expression> command is useful
[14:16] <Laurenceb_> i see
[14:17] <DanielRichman> <expression> is anything (function calls, whatever, you can make the process do syscalls or library calls or any function call using this)
[14:17] <DanielRichman> or can be as simple as a variable name
[14:17] <DanielRichman> just without the ;
[14:17] <DanielRichman> oh and if the signal it received isn't fatal, cont will start the process again
[14:19] <fsphil> l = list?
[14:19] <DanielRichman> yeah that;s right
[14:26] <DanielRichman> GDB will also peek inside structs, etc. (I think it needs the source to do that; or -g might be enough)
[14:26] <DanielRichman> ie print *pointer_to_struct will show its components
[14:29] <fsphil> ah, didn't know that
[14:38] <griffonbot> Received email: Davejay <info@davejay.co.uk> "New Project"
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[14:45] <m1x10> file.open("LOG.TXT", O_WRITE | O_APPEND);
[14:45] <m1x10> file.write(ATmega328.vccStr);
[14:45] <m1x10> file.close();
[14:45] <m1x10> Fat16::ls(LS_DATE | LS_SIZE);
[14:46] <m1x10> lol, I wouldnt expect something so eash
[14:49] <fsphil> can you have multiple files open at once?
[14:55] <m1x10> yes
[14:55] <m1x10> no
[14:55] <m1x10> im not sure
[14:55] <m1x10> because file.write() writes to the currently opened file
[14:56] <DanielRichman> Looks like there's only one file object involved
[14:56] <DanielRichman> rather than open() creating another file object
[14:57] <DanielRichman> If you had multiple files I would have expected file = Fat16::open() and then file->write() or something
[14:57] <m1x10> fsphil: if you want to write at more files, you just close() the 1st file and open() the 2nd
[14:58] <m1x10> oh wait
[14:58] <m1x10> DanielRichman is right
[14:58] <m1x10> you can have multiple File objects
[14:58] <m1x10> Fat16 file1;
[14:58] <m1x10> Fat16 file2;
[14:58] <m1x10> like that
[14:59] <DanielRichman> hmm
[14:59] <m1x10> wait a second to try it
[14:59] <DanielRichman> which library are you using?
[14:59] <m1x10> http://code.google.com/p/fat16lib/
[14:59] <m1x10> it has a nice pdf where explains all methods
[15:01] <DanielRichman> it would appear that the sd card initialisation etc is all static
[15:02] <DanielRichman> so then you Fat16::init(static method) and then create many Fat16 objects which will "just use" that global state
[15:03] Action: DanielRichman would have had a Fat16 class & a File class; and fs = Fat16(constructor); file = fs->open(name); file.write(data); file.close(data)
[15:06] <m1x10> well,
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[15:06] <m1x10> LOG.TXT 2000-01-01 01:00:00 934
[15:06] <m1x10> DSC00428.JPG 2010-10-13 14:51:32 368523
[15:06] <m1x10> LOG2.TXT 2000-01-01 01:00:00 26
[15:06] <m1x10> at the same time
[15:06] <m1x10> 2 open files for writing
[15:06] <m1x10> file.open("LOG.TXT", O_WRITE | O_APPEND);
[15:06] <m1x10> file2.open("LOG2.TXT", O_WRITE | O_APPEND);
[15:06] <m1x10> file.write(ATmega328.vccStr);
[15:06] <m1x10> file2.write(DS18B20.tempStr);
[15:06] <m1x10> file.close();
[15:06] <m1x10> file2.close();
[15:06] <m1x10> Fat16::ls(LS_DATE | LS_SIZE);
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[15:07] <m1x10> so fsphil the answer is yes
[15:10] <earthshine> I mean does anyone have one of those satellite receiver kits for weather images ?
[15:10] Action: m1x10 knows how to write data on sd, now its time to take some photos with his new cam.
[15:16] <GW8RAK> Earthshine - yes, I've done a bit of that
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[15:17] <earthshine> What setup do you have? Basically I am looking for a recommendation for a weather satellite receiving kit
[15:17] <earthshine> Mainly for astronomical purposes but also useful for HAB
[15:17] <GW8RAK> Where in the world are you? Is it australia?
[15:17] <earthshine> UK
[15:18] <GW8RAK> Getting confused. There are two ways of receiving weather sat images, there are the NOAA satellites outputting basic images around 135MHz
[15:19] <GW8RAK> and high res ones at, IIRC, 1.7GHZ.
[15:19] <GW8RAK> I've only tried the basic ones with some reasonable results.
[15:20] <GW8RAK> You can rx them with standard amateur equipment such as an FT-817, but the 3KHz bandwidth filters out rather a lot. You need a 15KHz bandwidth for full signal
[15:21] <fsphil> thanks m1x10, DanielRichman
[15:21] <earthshine> I'm not talking about using HAm equipment. I mean dedicated receivers.
[15:22] <GW8RAK> Have a look at http://www.geo-web.org.uk/shop.html for typical equipment
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[15:22] <earthshine> thanks
[15:23] <GW8RAK> There is someone in Czech republic I think who supplies a kit which is the one I have. It works okay, but one of the satellite channels is close to a UK pager channel and the onborad filter is not selective enough. However I've not found it to be a problem and there is a lot of pager breakthrough at home.
[15:23] <jcoxon> talking about weather sats?
[15:24] <jonsowman> this is my wxsat decoding kit
[15:24] <jonsowman> http://wxsat.hexoc.com/images/testing/IMG_0071.JPG
[15:24] <jonsowman> for APT sats
[15:24] <jonsowman> R2ZX rx'er and WxToImg
[15:24] <jonsowman> simples
[15:24] <earthshine> What do you use for an aerial ?
[15:25] <fsphil> people still use pagers?
[15:25] <jonsowman> we built a quadrifilar helicoidal
[15:25] <GW8RAK> Yes, weather sats. There is another group of people who are the original weather sat decoding people but I think there was a big falling out a few years ago and GEO was formed.
[15:25] <jonsowman> http://wxsat.hexoc.com/images/testing/IMG_0072.JPG
[15:25] <jonsowman> this one, in fact
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[15:25] <GW8RAK> I've got a turnstile which has worked quite well, but a quariliar is the best.
[15:26] <GW8RAK> quadrifiliar
[15:26] <jcoxon> hooray pcbs + rfbees + SPoT arrived
[15:26] <jonsowman> decoded imgs: http://wxsat.hexoc.com/wxtoimg/
[15:27] <fsphil> ooh how do they look jcoxon? the pcb's?
[15:27] <earthshine> Ouch - expensive ant
[15:27] <jonsowman> hence why we built one :)
[15:27] <earthshine> Are there online instructions for building one of those ?
[15:27] <jcoxon> earthshine, i have a receiver if you want one
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[15:27] <jcoxon> its just sitting around in my flat
[15:27] <jonsowman> bbl
[15:27] <earthshine> which one James ?
[15:27] <jcoxon> oh for weather sats
[15:27] <jcoxon> it just does them
[15:28] <earthshine> Yeah but what make/model ?
[15:28] <jcoxon> not sure
[15:28] <jcoxon> am not there to look
[15:28] <jcoxon> fsphil, scarily small
[15:29] <earthshine> Let me know next time you see it please - I may be interested depending what it is
[15:29] <jcoxon> it does the job - relies on crystals for the various sats
[15:29] <jcoxon> and i've only got 2 crystals
[15:30] <davidjc> Do any of you in the UK bother with third party liability insurance?
[15:31] <jcoxon> not usually
[15:31] <jcoxon> purely as its is very expensive
[15:31] <jcoxon> certainly more then the launch
[15:31] <jcoxon> and take as many steps to avoid any problems
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[15:32] <GW8RAK> I asked the British Model Flying Association and they have 3rd party cover as part of their standard policy included with their membership
[15:32] <jcoxon> such as not launch if predicted urban landing etc
[15:33] <davidjc> I may look into that GW8RAK
[15:35] <GW8RAK> IIRC, membership was about £30.
[15:36] <jcoxon> GW8RAK, covering balloon launches?
[15:36] <GW8RAK> Yes.
[15:36] <jcoxon> wow
[15:36] <GW8RAK> But BBMFA member services has a very slow response and have yet to send me a copy of the policy document.
[15:37] <GW8RAK> My local flying club chairman hates dealing with them as they are so slow.
[15:37] <GW8RAK> But with our launch getting closer, I will renew my efforts to get the policy document and will confirm balloons are included.
[15:38] <GW8RAK> That should be BMFA, the BBMF is the Battle of Britain Memorial Flight!
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[15:41] <Laurenceb_> http://media.armadilloaerospace.com/2010_06_05/2010_06_05_Mod_free_flight-engine_restart-full_edit.wmv
[15:41] <Laurenceb_> insane
[15:41] <m1x10> Finally my backup gsm module is ready!
[15:41] <m1x10> http://imagebin.org/118315
[15:43] <fsphil> dinky!
[15:44] <GW8RAK> Finally managed to make headway. The BMFA insurers are sending a copy of the policy document and I have asked for specific clarification of balloon flight.
[15:45] <m1x10> fsphil: dinky was going to me?
[15:45] <fsphil> m1x10, yep -- it's quite neat
[15:45] <m1x10> i was about to ask what means dinky !
[15:46] <m1x10> i suppose neat!
[15:47] <fsphil> basically -- it's compact, looks tidy
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[15:53] <m1x10> :)
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[16:19] <jcoxon> its blinking!
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[16:22] <davejay> d
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[16:28] <jcoxon> fsphil, http://www.flickr.com/photos/jcoxon77/5078206941/
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[16:42] <fsphil> whoa' you got it going already
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[16:59] <m1x10> jcoxon: iLike :)
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[17:23] Action: m1x10 plans to buy a radio at 100mW
[17:42] <m1x10> would it be ok to buy my next radio at 144.7mhz for aprs rather than standar 144.8?
[17:45] <SpeedEvil> If you're not on the standard frequency, will the existing network pick it up?
[17:46] <SpeedEvil> Also. Are you still in an approved band in your country.
[17:48] <m1x10> ok
[17:48] <m1x10> should search for that info
[17:48] <TehLaser> 144.7 might be a repeater input.
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[17:48] <m1x10> i said it for example
[17:49] <TehLaser> (or, rather, close to one)
[17:49] <m1x10> maybe 144.5
[17:49] <m1x10> just not to interfere to the existing aprs network
[17:49] <TehLaser> 144.5 is OSCAR, no?
[17:49] <TehLaser> You should probably go up, not down.
[17:49] <m1x10> dunno, I must look the bandplan
[17:51] <TehLaser> You lose all the APRS infrastructure if you go elsewhere, but if you've got your own digis/igates, it's fine to use a different frequency.
[17:55] <SpeedEvil> Also - occasional transmission isn't that bad.
[17:56] <SpeedEvil> Every 5 min on ascent, 1 min on descent, 30s under 5km say
[17:56] <m1x10> oh
[17:56] <m1x10> 5min
[17:56] <m1x10> lol
[17:56] <m1x10> i have it 32s
[17:57] <m1x10> all the time:)
[17:57] <SpeedEvil> I'm not saying 32s is bad.
[17:57] <SpeedEvil> Just - does it actually give you any benefit at all?
[17:57] <m1x10> more measurements
[17:57] <SpeedEvil> Unless you're planning on not recovering it, that's not an issue.
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[19:04] <m1x10> ping someone
[19:12] <Laurenceb> whats a good ubuntu app for finding large files eating up my hdd?
[19:13] <Laurenceb> *whats a good ubuntu app for finding large files eating up my root file system?
[19:16] <sbasuita> Laurenceb: applications -> accessories -> disk usage analyser
[19:16] <Randomskk> I did not know about that
[19:16] <Randomskk> sweet
[19:17] <Laurenceb> thanks
[19:17] <Laurenceb> what the hell
[19:17] <Laurenceb> 80GB of stuff...
[19:18] <Laurenceb> i dont even know of any important documents in there
[19:22] <sbasuita> By the way, does anybody have any contacts that might be able to offer sixth form work experience? Something physics'y and exciting like particle physics or astronomy would be awesome
[19:24] <Randomskk> no one I'm on close enough terms with to ask directly but you could email SSTL - they're in the guildford science park and make satellites and are quite friendly to that sort of thing
[19:24] <Randomskk> (and are now owned by astrium)
[19:24] <Laurenceb> you could try emailing some universities
[19:25] <sbasuita> yeah, i'm drawing up a list of places to contact like local labs, companies etc
[19:25] <sbasuita> just thought it might be possible to get in somewhere a bit different through contacts
[19:26] <Randomskk> check out the nuffield bursary scheme too
[19:26] <sbasuita> Randomskk: yeah that's high up :)
[19:26] <Randomskk> they're awesome
[19:26] <Randomskk> I did one
[19:26] <Randomskk> the report writing is a bit meh but otherwise fantastic
[19:27] <Randomskk> if you're into computer vision I know a dude at surrey university but it's not very physicsy
[19:27] <sbasuita> Randomskk: that would be interesting, but not really relevant to nat sci
[19:27] <sbasuita> Randomskk: is it quite hard to get into nuffield?
[19:28] <sbasuita> Randomskk: also, do you have to find your own project or will they help you with it after you're accepted?
[19:28] <Randomskk> they give you a project
[19:28] <Randomskk> you don't find anything
[19:28] <Randomskk> and everyone at my school who applied got one
[19:28] <sbasuita> nice, i'd really love to do that
[19:28] <Randomskk> but I don't know what that says about how hard they are
[19:28] <Randomskk> only three of us applied
[19:28] <sbasuita> Randomskk: what did you do?
[19:28] <Randomskk> all three of us later got into oxbridge
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[19:28] <Randomskk> sbasuita: computer vision stuff with the aforementioned guy
[19:29] <sbasuita> ah right ;)
[19:29] <Randomskk> but by which I mean
[19:29] <Randomskk> playing with a remote control car
[19:29] <Randomskk> they then had me back, paid for my time, for four weeks
[19:29] <Randomskk> to do more playing with a remote control car
[19:29] <Randomskk> http://info.ee.surrey.ac.uk/Personal/R.Bowden/projects/diplecs/history_files/DSC02373b.jpg
[19:29] <sbasuita> and then you had to blag the scientific value ey?
[19:30] <Randomskk> http://info.ee.surrey.ac.uk/Personal/R.Bowden/projects/diplecs/index.htm
[19:30] <Randomskk> oh, no
[19:30] <Randomskk> it didn't have scientific value per se
[19:30] <Randomskk> it was all contributing towards improving background work in autonomous car development or something
[19:30] <Randomskk> check the video on that second link
[19:30] <Randomskk> it has me in it and stuff
[19:30] <sbasuita> Randomskk: what do you look like? :P
[19:31] <Randomskk> see if you can guess
[19:31] <Randomskk> there are three people in the video, one is me, one is a doctor, one is a postgrad doing a Ph.D
[19:33] <sbasuita> Randomskk: i'm guessing you were the driver
[19:33] <Randomskk> correct
[19:33] <sbasuita> :)
[19:34] <sbasuita> looks like you had fun
[19:34] <Randomskk> also I rigged up all the electronics and programmed the laptop
[19:34] <Randomskk> seriously. when they had me back on pay, I was paid as much as I later got paid to develop decent C++ and later still awful PHP
[19:34] <sbasuita> Randomskk: so did you actually do any computer vision?
[19:34] <Randomskk> but all I did was dick around with powerful RC cars
[19:34] <Randomskk> sbasuita: kind of, for a bit, on a different project
[19:34] <Randomskk> trying to position-lock a quadcopter using optical flow from a wireless camera
[19:35] <Randomskk> I got the optical flow working
[19:35] <Randomskk> but using it to stabalise the quadcopter was a silly idea
[19:35] <Randomskk> http://www.youtube.com/watch?v=cLAJk21QFE0
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[19:36] <sbasuita> it seems to like that shelf, yes
[19:36] <Randomskk> oh, no, that was under /manual/ control
[19:36] <Randomskk> it was unstable as shit
[19:36] <Randomskk> it needed proper onboard stability control before optical flow was a feasible accomplishment I think
[19:37] <Randomskk> its gyroscope was a mechanical gyro with a metal pad beneath it, its movement over the pad was read to do stuff
[19:37] <Randomskk> brushed DC motors too
[19:37] <Randomskk> cheap toy
[19:38] <Randomskk> but really: it was great fun. the nuffield money just covered transport etc but even so
[19:38] <Randomskk> good taste of what doing research for a living instead of work is like, too
[19:38] <Randomskk> preferable in many ways I feel
[19:38] <sbasuita> Randomskk: so what do they ask when you apply?
[19:39] <Randomskk> you get a bigish form
[19:39] <Randomskk> I may have it around. let me see.
[19:41] <Randomskk> apparently not. that's a shame
[19:41] <Randomskk> sorry. anyway
[19:41] <Randomskk> personal data + what are you interested in and why in a couple of paragraphs
[19:44] <sbasuita> hmm doesn't sound too bad
[19:44] <Randomskk> it's really not
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[20:01] <DanielRichman> I intend to apply to do a nuffield
[20:02] <DanielRichman> my summer work experience suggested I do one and ask to go back
[20:02] <Randomskk> yea really
[20:02] <Randomskk> they are totally worth doing
[20:04] <DanielRichman> _and_ you get paid
[20:04] <Randomskk> nuffield pay is a bit measly
[20:05] <DanielRichman> yeah but it's like getting paid for work experience; they're doing you a favour and paying you for it
[20:05] <Randomskk> yea it's great
[20:05] <Randomskk> definitely try and do one
[20:07] <DanielRichman> I vageuly recall looking at the website for nuffield bursaries and not seeing the Click Here to Sign Up link
[20:07] <DanielRichman> Do you have to email someone?
[20:07] <DanielRichman> How did you get involved/did the school help?
[20:07] <Randomskk> probably. my school helped
[20:07] <Randomskk> but the forms should be available on the website or something
[20:07] <DanielRichman> hmm. Iirc there's a "local coordinator" who you have to get in touch with
[20:07] <m1x10> ping Randomskk
[20:08] <DanielRichman> I could ask my school to do it but they're not very... efficient
[20:08] <Randomskk> I'm right here
[20:08] <m1x10> :)
[20:08] <Randomskk> DanielRichman: there is a non-school local coordinator, e.g. for your region
[20:08] <m1x10> do u know if ~1V of audio input is huge?
[20:08] <Randomskk> they should be able to get you in touch with them
[20:08] <Randomskk> m1x10: totally relative
[20:08] <DanielRichman> ok; I'll email someone
[20:09] <m1x10> the nrx1 receiver receives the signal and moves it to soundcard. scope shows ~1vp-p
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[20:13] <fsphil> m1x10, that's pretty normal
[20:14] <m1x10> there's an issue where that radioshield thing cannot demodulate because of very loud signal
[20:15] <fsphil> use a voltage divider to reduce it if it's too loud
[20:15] <m1x10> on the receiver side?
[20:15] <fsphil> if that's where it's too loud
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[20:26] <m1x10> guys
[20:26] <m1x10> cu
[20:26] <m1x10> good night
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[21:07] <Laurenceb> doh
[21:07] Action: Laurenceb just realised he has 60GB of unallocated HDD
[21:08] <Laurenceb> after trying to clear a few more GB of uneeded files
[21:08] <Laurenceb> fail
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[00:00] --- Thu Oct 14 2010