highaltitude.log.20101117

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[09:58] <earthshine_> morning
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[12:29] Action: Laurenceb_ has been reading about FEC
[12:29] <Laurenceb_> suprisingly simple really
[12:30] <Laurenceb_> viterbi + reedsolomon
[12:30] <GW8RAK> Some of it is. But then I've found people confuse and complicate it.
[12:31] <Laurenceb_> turbo is concatenated Viterbi
[12:31] <Laurenceb_> LDPC is really easy to understand
[12:31] <Laurenceb_> and thats about it
[12:31] <Laurenceb_> the maths behind reed solomon is pretty insane
[12:31] <GW8RAK> Had a quick look at it yesterday and I was surprised that even I understood it.
[12:31] <Laurenceb_> but the actual idea of polynomials is really obvious
[12:32] <GW8RAK> I like AMTOR FEC; send each character twice with 5 other characters in between them.
[12:32] <Laurenceb_> funniest thing is LDPC is state of the art
[12:32] <GW8RAK> And yet theorised a long time ago.
[12:32] <Laurenceb_> and its trivially easy to understand
[12:33] <Laurenceb_> im thinking of designing a binary data mode for hab
[12:33] <Laurenceb_> using bpsk packets with fec
[12:34] <Laurenceb_> the encoding for large ldpc blocks gets pretty demanding, but at the low baud rates wed use its easy for e.g. an avr
[12:34] <GW8RAK> Most of the HF datamodes I've used have been relatively simple and easy to understand.
[12:34] <GW8RAK> Or proprietary, which gets expensive, but very impressive for HF links.
[12:35] <Laurenceb_> im thinking bpsk modulated with a pseudorandom sequence header of 32 bits or so, then ldpc data (~512 bits) interleaved)
[12:35] <Laurenceb_> maybe 300baud or more
[12:35] <Laurenceb_> shouldnt be too hard to code - use pycodes for the fec decoding
[12:36] <Laurenceb_> http://www.mit.edu/~emin/source_code/pycodes/pycodes.html#CodeMaker.py
[12:36] <GW8RAK> Pactor 3 with compression gives up to 10kbps.
[12:40] <GW8RAK> Nominal 3kbps
[12:43] <Laurenceb_> proprietory
[12:46] <Laurenceb_> looks like ofdm to me
[12:46] <GW8RAK> I think it is.
[12:46] <Laurenceb_> packtor 3 looks like packtor 2 on ofdm channels
[12:46] <Laurenceb_> and 2 is just qpsk
[12:47] <Laurenceb_> with ntx2 or even cc1020/si4432, ofdm isnt possible
[12:47] <Laurenceb_> and qpsk gets tricky - hence i was thinkign bpsk
[12:48] <GW8RAK> I certainly wasn't suggesting use of Pactor type, just that my experience is based on it.
[12:48] <GW8RAK> Although the Americans hate it, as you have to pay full price for it. They don't like the concept of only one supplier.
[12:48] <GW8RAK> But they'll happily buy Apple products.
[12:49] <Laurenceb_> http://www.scs-ptc.com/shop/categories/modems-en
[12:49] <Laurenceb_> eeek the prices
[12:49] <Laurenceb_> its probably just a pic in there
[12:50] <GW8RAK> Mine was heavily discounted, I'm glad to say.
[12:50] <Laurenceb_> or maybe an arm for the pactor3
[12:51] <GW8RAK> Over a 1000 euros for a PTCIIPro!
[12:52] <Laurenceb_> maybe i should go into business
[12:53] <GW8RAK> Pactor has become quite dominant because of software products such as Sailmail, Bushmail and Winlink, enabling email over HF almost globally.
[12:53] <Darkside> im considering flying a beagleboard
[12:53] <Darkside> reckon it will work at -20? :P
[12:53] <Darkside> im pretty sure everything is only specced to 0 deg C :P
[12:54] <GW8RAK> That looks interesting. Most componenets are good to -20C.
[12:54] <GW8RAK> I doubt the components would be low spec ones, but perhaps it ishow they work together.
[12:54] <GW8RAK> Has anyone tried a Gumstix on here?
[12:55] <Darkside> i'm enticed by the idea of being able to write all my code in python
[12:55] <Darkside> :P
[12:57] <Darkside> also then you can do stuff like plugging in a USB webcam and using that to take images
[12:57] <GW8RAK> And run Linux and an SSTV package to do it all for you?
[12:58] <Darkside> yeah i could do that
[12:58] <Darkside> :P
[12:58] <Darkside> well it would run linux anyway
[12:58] <Darkside> but being able to do that kind of thing would be pretty freaking cool
[12:58] <Darkside> battery life might be an issue though
[12:58] <Darkside> i think i'd do SSTV over UHF CB with that
[12:59] <Darkside> every few minutes key up a 5W UHF module i have :P
[12:59] <Darkside> beagleboard has audio out, so i can get the audio out from it
[13:00] <GW8RAK> 5W at 30km high. I wonder what the range would be?
[13:00] <Darkside> and it has a heap of GPIOs for controlling an NTX2 (For normal telemetry) and the PTT for the UHF raido
[13:00] <Darkside> hehe
[13:00] <Darkside> i'd drop the power i think
[13:00] <Darkside> 5W is a bit much..
[13:00] <GW8RAK> Don't be mean. Go for it.
[13:00] <Darkside> ?
[13:01] <Darkside> what, do 5W? :P
[13:01] <Darkside> thats freaking insane
[13:01] <Darkside> also i'd need a huge battery to do it
[13:01] <GW8RAK> So am I!
[13:01] <GW8RAK> The battery may not last long, but think of the reception reports
[13:01] <Darkside> lol
[13:02] <Darkside> would be awesome fun :P
[13:02] <GW8RAK> Imagine what signals from AWACS are like with over a kilowatt to play with?
[13:03] <Darkside> have it log images, and every few minutes (synced to GPS time or whatever) have it broadcast an SSTV image
[13:03] <Darkside> plug in a USB wifi card, so when it hits the ground it can broadcast a wifi network :P
[13:04] <Darkside> and you can connect to it and get a live view from the camera
[13:04] <Darkside> lol
[13:04] <Darkside> silly ideas
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[13:05] <Darkside> shenki: you getting this?
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[13:33] <GW8RAK> I'm hoping to "fly" my payload around the shack this weekend (with a bit of luck). Can I just go ahead and use dl-fldigi to send data through to the tracking page or does it need to be cleared by someone??
[13:44] <juxta> GW8RAK, there needs to be an XML file setup with the data format specific to your payload
[13:45] <juxta> here's an example from jcoxon's payloads: http://robertharrison.org/listen/atlas.xml
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[13:52] <GW8RAK> Thanks Juxta, my format is the same as Apex. Where does the XML sit? On my machine or remotely?
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[14:01] <jonsowman> GW8RAK: on the listener server
[14:01] <jonsowman> once you've made the XML, send it across and i'll put it on the server for you
[14:03] <WillDuckworth> don't suppose someone who has done this could rustle up a wiki entry....?
[14:03] <jonsowman> WillDuckworth: making an XML you mean?
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[14:05] <Laurenceb_> aha interesting
[14:05] <Laurenceb_> if (!capture) {
[14:05] <Laurenceb_> MilliSleep((long)ceil((1e3 * count) / req_sample_rate));
[14:05] <Laurenceb_> return count;
[14:05] <Laurenceb_> }
[14:05] <Laurenceb_> in sound.cxx
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[14:06] <Laurenceb_> it delays to get the required output rate
[14:07] <GW8RAK> jonswoman - thank you. After a long period on the software, I just want to hear the radio sqwarking.
[14:08] <jonsowman> i'll do the xml for you if you like
[14:08] <jonsowman> I need a couple of sample strings
[14:08] <jonsowman> and a description of each field in the telemetry
[14:08] <jonsowman> and all the RTTY parameters
[14:09] <GW8RAK> Thank you again. For the first launch I'm wondering about a short form string (just the essentials) and adding additional parameters later.
[14:10] <jonsowman> that's fine
[14:10] <jonsowman> the XML can be changed for the second flight
[14:10] <GW8RAK> Thanks. I've just got the last bit of software to integrate into the body tonight and then I can get the soldering iron out.
[14:11] <jonsowman> cool :)
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[14:21] <Elwell> ok - Am thinking of putting an APRS tracker in the car, but I'd like one I can reuse should I ever get a ballon up. -- suggestions on hardware? (is this on a wiki somewhere?)
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[14:22] <SpeedEvil> Comparatively few people here use APRS
[14:22] <SpeedEvil> But - wait around
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[14:22] <NigeySWales> afternoon all
[14:22] <jonsowman> hi
[14:22] <NigeySWales> hi jon
[14:22] <NigeySWales> my power supply for the laptop went bang :(
[14:23] <jonsowman> oh dear
[14:23] <jonsowman> that's unfortaunte
[14:23] <jonsowman> er, unfortunate
[14:23] <Elwell> SpeedEvil: yeah, thats why I'm asking -- dual mode 'thing' may be more use
[14:23] <NigeySWales> 40quid down the drain, a month out of warranty to, typical :/
[14:24] <jkominar> Elwell - we're about to launch a balloon using APRS to track. We have an OpenTracker+ from Argent Data Systems in it. All our experiences with it so far have been very positive.
[14:25] <Elwell> jkominar: got a URL with your payl;oad details?
[14:26] <Elwell> I've been semi-pondering the T2-301
[14:26] <jkominar> Sadly, no. I'm a web-dev by trade and it's a "Cobblers shoes" kind of situation for me :) Just can't be bothered to do more web work after hours with everything else going on after spending the day doing it at work.
[14:28] <NigeySWales> http://news.bbcimg.co.uk/media/images/50021000/jpg/_50021496_iss025e009840,1.jpg
[14:28] <NigeySWales> cracking pic fropm the ISS
[14:28] <NigeySWales> from*
[14:28] <jkominar> That said, I can tell you our payload consists of a Cannon SD 630 w/ CHDK for taking photos, a Trimble Copernicus GPS chip, the OpenTracker+ for APRS translation, and a SRB MX146 radio chip to broadcast. There's some misc. electronics as well for regulating voltages to the various devices that require power... but that's about it.
[14:28] <SpeedEvil> Is that not a composite?
[14:28] <SpeedEvil> hmm
[14:29] <SpeedEvil> no, I suppose area is about right
[14:30] <NigeySWales> no, its taken from the cupola so prolly just a single shot
[14:31] <Laurenceb_> think ive worked out my fldigi rtty issues
[14:31] <Laurenceb_> fldigi uses a millisecond function thats based of jiffie counting
[14:31] <Laurenceb_> to set the timebase
[14:31] <SpeedEvil> Jiffies...
[14:31] <SpeedEvil> How quaint.
[14:31] <Elwell> NigeySWales: there's also a nice one of london http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS006&roll=E&frame=22939
[14:32] <Laurenceb_> its a non blocking millisecond delay
[14:32] <Laurenceb_> i can find it called in sound.cxx
[14:32] <NigeySWales> Elwell, wow now thats light pollution for ya !
[14:32] <Laurenceb_> cant find where its defined
[14:32] <Laurenceb_> but it must be jiffie quantised right?
[14:32] <Laurenceb_> as its non blocking
[14:33] <SpeedEvil> No
[14:33] <SpeedEvil> You can - now - request with timers that your process is scheduled in 349.2ms
[14:33] <Laurenceb_> interesting
[14:34] <Laurenceb_> i need to find where MilliSleep is defined
[14:34] <SpeedEvil> and if the computer is idle, and your system is tickless - it will do a tick especially for you then
[14:34] <SpeedEvil> This is awesome on phones, done right
[14:34] <Laurenceb_> thats kind of cool for real time control
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[14:35] <Laurenceb_> is MilliSleep defined as part of linux?
[14:35] <SpeedEvil> dunno
[14:35] <SpeedEvil> name is not familiar
[14:36] <SpeedEvil> man says no
[14:36] <SpeedEvil> nanosleep() suspends the execution of the calling thread until
[14:36] <SpeedEvil> either at least the time specified in *req has elapsed, or the
[14:36] <SpeedEvil> delivery of a signal that triggers the invocation of a handler in
[14:36] <SpeedEvil> the calling thread or that terminates the process.
[14:37] <NigeySWales> you can use usleep(milliseconds * 1000);
[14:37] <SpeedEvil> Or yes, that
[14:37] <Laurenceb_> but its blocking
[14:46] <Laurenceb_> http://pastebin.com/qvUk2U9D
[14:46] <Laurenceb_> found that...
[14:50] <NigeySWales> hmmz
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[14:54] <Laurenceb_> work of the devil that
[14:55] Action: Laurenceb_ exorcises the iFail
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[15:05] <Laurenceb_> void MilliSleep(long msecs)
[15:05] <Laurenceb_> {
[15:05] <Laurenceb_> #ifndef __MINGW32__
[15:05] <Laurenceb_> struct timespec tv[2] = { {msecs / 1000L, msecs % 1000L * 1000000L} };
[15:05] <Laurenceb_> nanosleep(&tv[0], &tv[1]);
[15:05] <Laurenceb_> #else
[15:05] <Laurenceb_> Sleep(msecs);
[15:05] <Laurenceb_> #endif
[15:05] <Laurenceb_> }
[15:05] <Laurenceb_> oops - thats what ive found in fldigi
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[15:11] <Laurenceb_> hang on... msecs % 1000L * 1000000L <- isnt that only valid for useconds
[15:12] <Laurenceb_> http://linux.die.net/man/2/nanosleep
[15:16] <NigeySWales> appears so, quite confusing :|
[15:17] <Laurenceb_> altogehter pretty odd
[15:17] <Laurenceb_> sleep doesnt take an argument in msecs
[15:18] <Laurenceb_> oh hjang on http://msdn.microsoft.com/en-us/library/ms686298%28VS.85%29.aspx
[15:18] <Laurenceb_> so the only odd thing is that *10^6
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[15:20] <Laurenceb_> http://linux.die.net/man/2/nanosleep <- see bugs
[15:21] <DanielRichman> milliseconds * 10^6 = nanoseconds ?
[15:22] <NigeySWales> hi DanielRichman
[15:22] <DanielRichman> NigeySWales: hi
[15:22] <Laurenceb_> oh doh
[15:22] <Laurenceb_> that was a stupid mistake
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[15:23] <Laurenceb_> so.. im wondering if my machine is handling the delays slightly oddly
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[15:24] <NigeySWales> could be possible
[15:25] <Laurenceb_> im slightly confused actually
[15:25] <DanielRichman> if the delays are Uber small then there might be problems
[15:25] <Laurenceb_> if fldigi uses delays between reads to get a 8ksps sample rate... how does that work on a multithreaded os
[15:26] <Laurenceb_> surely theres huge gaps in program execution
[15:26] <Laurenceb_> so itll be utterly off
[15:26] <DanielRichman> Indeed, that's what I would think. I would have thought that whatever fldigi does the soundcard driver is responsible for dealing with the sample rate?
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[15:28] <Laurenceb_> apparently not
[15:29] <Laurenceb_> if (!capture) {
[15:29] <Laurenceb_> <Laurenceb_> MilliSleep((long)ceil((1e3 * count) / req_sample_rate));
[15:29] <Laurenceb_> <Laurenceb_> return count;
[15:29] <Laurenceb_> <Laurenceb_> }
[15:29] <Laurenceb_> <Laurenceb_> in sound.cxx
[15:29] <Laurenceb_> count is the number of samples to grab
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[15:31] <DanielRichman> Laurenceb_: I think those lines might be for when it's reading from a .wav file?
[15:31] <Laurenceb_> yes
[15:31] <Laurenceb_> this is what im talking about
[15:31] <DanielRichman> so it has to pretend to play it at real speed
[15:31] <Laurenceb_> i seem to have weird timebase glitches whan playing wav
[15:31] <Laurenceb_> trying to track down why
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[15:32] <DanielRichman> what do you mean by a glitch? even if the OS took a ten second nap in between scheduling fldigi's sound thread it would still get the same data from the file and as far as any processing was concerned it would be the same audio at 8ksps surely?
[15:32] <Laurenceb_> hmm yes
[15:33] <Laurenceb_> it wont be getting another timebase from anywhere else
[15:33] <Laurenceb_> maybe im losing data somewhere
[15:33] <Laurenceb_> ive seen data droppling out of the fifo on several occasions
[15:39] <DanielRichman> there is a buffer which is of a limited size, I believe
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[15:43] <Laurenceb_> hmm interesting
[15:44] <Laurenceb_> ok, so if the xtal on my sdr (which sets the output sample rate) was running slightly faster the pc clk
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[15:44] <Laurenceb_> then the buffer would fill up
[15:44] <Laurenceb_> then itd start dropping a bit of data...
[15:44] <Laurenceb_> however id see a huge lag starting to appear
[15:45] <Laurenceb_> well.. what i tend to see is ok performance for ~10 minutes then i tend to drop little periods of data
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[15:59] <Laurenceb_> http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-26-21434 <-insane
[16:00] <Laurenceb_> need to try that
[16:00] Action: Laurenceb_ wonders if itd work over cctv
[16:00] <NigeySWales> i cant even say that p word lol
[16:02] <Laurenceb_> take video - reduce resolution to gain S/N, adaptive noise cancelling with Green versus red and blue - then bandpass
[16:02] <Laurenceb_> and you get a heartrate video
[16:04] <NigeySWales> :o sounds to complicated for my little brain
[16:04] <Laurenceb_> of course moving objects caus all sorts of screw ups so itd need to be combined with something like the mpeg encoding algorithm
[16:06] <Laurenceb_> aha - unix buffer size is limited to 64KB - less than 4 seconds of my audio stream - iwas easily getting that much lag when it went screwy on saturday
[16:06] <Laurenceb_> explains the issues XD
[16:07] <Laurenceb_> of course fixing it is rather hard
[16:10] <NigeySWales> dam :( you got your work cut out there dudey
[16:11] <Laurenceb_> just restart the hardware completely every 10 minutes
[16:11] <Laurenceb_> or hack the libsamplerate calls to give me a 0.01% funged sample rate
[16:12] <Laurenceb_> *fudged
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[16:40] <NigeySWales> meh got no 10k resistors
[16:40] <Randomskk> use ten 1ks
[16:40] <Randomskk> to be honest
[16:40] <Randomskk> what's it for
[16:40] <Randomskk> you can probably get away with a k
[16:41] <NigeySWales> light resistor
[16:41] <Randomskk> light?
[16:41] <NigeySWales> works but values are all over the shop
[16:41] <Randomskk> as in, an LDR?
[16:41] <NigeySWales> LDR yup
[16:41] <Randomskk> what are you doing with it?
[16:42] <NigeySWales> just fiddling at the mo
[16:42] <NigeySWales> nothing specific
[16:42] <Randomskk> I mean like, how is it connected etc
[16:42] <NigeySWales> oh its just on a breadboard connected to arduino analog via the 1k resistor
[16:43] <Randomskk> in a potential divider configuration? why do you need 10k?
[16:44] <NigeySWales> cause thats what the tutorial said to use lol
[16:44] <Randomskk> both are likely to work, depends on your ldr
[16:44] <NigeySWales> works ok, just i get a 200 output for very bright instead of their example of 800 .. so values are a bit out, no major issue
[16:45] <Randomskk> the values will be very different - the main thing really is just that its value depends on the amount of light
[16:45] <Randomskk> actual numerical values will depend on your exact ldr, the exact light level, random fluctuations and other things
[16:45] <NigeySWales> yup, max i got with a halogen lamp beaming on it was 500, and in pitch black i ts at 50ish
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[16:46] <NigeySWales> totally pointless exercise, but gets me used to using the breadboard again after err.. 18 years of not touching 1 :|
[16:47] <Randomskk> fair enough
[16:47] <NigeySWales> im probably the dumbest person in here :/
[16:49] <Randomskk> any given person is very rarely the smartest or dumbest person in any given group
[16:50] <Randomskk> statistics are great
[16:50] <NigeySWales> hmm.. guess so
[16:50] <NigeySWales> voltage is proportional to the inverse of the photocell resistance which is, in turn, inversely proportional to light levels
[16:50] <NigeySWales> mmhmm
[16:53] <Randomskk> well
[16:54] <Randomskk> depends on if your LDR is at the top or bottom of your potential divider
[16:54] <NigeySWales> top
[16:55] <NigeySWales> using the multimeter can see the voltage drops to, cann work it out from that and the chart i found
[16:56] <Randomskk> indeed
[16:56] <Randomskk> the LDR is a little bit non linear
[16:56] <Randomskk> the arduino measures the voltage at the middle of the divider, which is going to be the supply voltage (5V) times the resistance of the bottom resistor divided by the sum of the two resistances, resistor and LDR
[16:56] <Randomskk> so Vout = Vin * (R / (R+Rldr))
[16:56] <Randomskk> where R is the resistance of the normal resistance
[16:57] <NigeySWales> ok im understanding it now :D
[17:01] <NigeySWales> coffee.. thanks for explaining than Randomskk, very helpful!
[17:03] <Randomskk> np
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[17:43] <NigeySWales> hey phil
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[18:17] Nick change: earthshine_ -> earthshine
[18:19] <fsphil> evening nigey, how's things?
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[19:54] <m1x10> Iam a lol guy
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[20:06] <rjharrison_> hi jcoxon
[20:06] <rjharrison_> got hold of CAA today and gave then a knock for elvington
[20:07] <rjharrison_> Things sound a little more promising and I got an appology for the delay
[20:07] <jcoxon> haha
[20:07] <rjharrison_> Upu that is probably good news for you too
[20:07] <rjharrison_> So fingers x'ed
[20:07] <jcoxon> about time
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[20:08] <rjharrison_> I also have some icarus boards coming too
[20:08] <jcoxon> nice
[20:09] <rjharrison_> hey RocketBoy_ sent you the tracker for the DHL delivery
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[20:13] <jkominar> Can someone purge the predictor cache? I'm getting bogus values with it again.
[20:14] <jcoxon> ping jonsowman
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[20:16] <jkominar> I sent him a pm .. thanks. Wasn't sure if there was anyone else around here that had the power as well :)(
[20:16] <jkominar> :)
[20:16] <jcoxon> i have the power but not the knowledge :-p
[20:17] <jcoxon> DanielRichman could do it as well
[20:18] <DanielRichman> hmmm someone's trying to bruteforce a nessie login
[20:18] <DanielRichman> (just noticed 'coz I was looking at ps -ef to see if any predictor processes were running)
[20:18] <jcoxon> eeek
[20:18] <jcoxon> can you block their ip?
[20:18] <DanielRichman> jcoxon: it's key only auth. They would never get in
[20:19] <DanielRichman> ssh spam is standard
[20:19] <DanielRichman> um anyway re predictor; I think one can just rm -Rf the cache folder in /tmp but I don't want to do that while the predictor is running; I'm not 100% sure
[20:19] <jcoxon> true but its taking up processing power
[20:20] <SpeedEvil> how many attempts/second?
[20:20] <DanielRichman> barely any
[20:20] <SpeedEvil> they usually give in in a couple of minutes here.
[20:20] <jkominar> yeah - sorry, I've asked Jon a few times to do that, and he has quite quickly fixed it for me, but never explained in any detail about the circumstances through which it could be done
[20:20] <DanielRichman> I just saw a random ssh process that wasn't mine and wasn't anyone elses; so tailed auth.log and just saw them trying tonnes of usernames that don't exist
[20:20] <Upu> hey rjharrison nice one thanks :)
[20:20] <Upu> My PCB's were delivered today
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[20:21] <DanielRichman> it's one every 3 seconds
[20:21] <jkominar> Kinda par for the course of having a server connected to the internet
[20:21] <jkominar> We see it constantly here too with our servers at work.
[20:21] <jkominar> Just people randomly trolling IP's looking for holes to exploit.
[20:22] <DanielRichman> mmm the sad thing is they sometimes find some
[20:23] <Upu> I wouldn't worry too much about it happens all the time
[20:23] <Upu> if it becomes an issue I have piles of Fortigate firewalls I can put it behind
[20:24] <Upu> with IPS on
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[20:24] <DanielRichman> wow :P It's not an issue at the moment
[20:25] <DanielRichman> oh I just found a script +x ~jon/cleardata.sh ;P
[20:26] <Upu> Background "radiation" of the internet, we reckoned it used to be about 0.75kB/sec
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[20:27] <jkominar> ha - never thought of it that way.. I like it :)
[20:27] <Upu> yeah just set up something on a public IP and watch the traffic
[20:30] Action: LazyLeopard splits ssh traffic. Only stuff from a few select sources gets past the firewall on port 22. If I need to get in from a machine not among the select few then I have to use a different port and jump through an extra hoop too...
[20:30] <Upu> security through obscurity...
[20:31] <SpeedEvil> Can be effective.
[20:31] <LazyLeopard> ...but most of the brute-force crackers get blocked because they don't scan the entire port range looking for ssh.
[20:31] <Upu> it works against the bots I guess
[20:32] <Upu> check the number of attacks on 5060 SIP, increasing every day
[20:33] <LazyLeopard> Yeah. Cuts 99% of the carp from the logs. Just leaves the real smart crackers to worry about...
[20:34] <Elwell> blocking all but the ISP ip ranges that [people with a legit reason for SSH access] you need helps drastically in iptables
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[20:41] <DanielRichman> jkominar: data cleared
[20:41] <jonsowman> hi all
[20:41] <jonsowman> thanks DanielRichman
[20:41] <jonsowman> :)
[20:41] <jkominar> thanks all :)
[20:42] Action: jkominar crosses fingers for good wind on Saturday
[20:43] Action: jkominar uncrosses fingers in dissapointment :(
[20:43] <jonsowman> not great?
[20:43] <jkominar> http://habhub.org/predict/#!/uuid=4df3c4e4c19ea0d3528ab6d827c41924fd3069a0
[20:43] <jkominar> I'm still seeing the burst icon and landing icon overlap
[20:44] <jkominar> Seems odd to me.
[20:44] <jonsowman> hmm yes
[20:44] <jonsowman> indeed
[20:44] <jonsowman> that's wrong
[20:46] <NigeySWales> dam, james left :(
[20:46] <jonsowman> ha yes I need to get hold of him too
[20:46] <NigeySWales> need to ask him if hes posted the gps breakout :/
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[20:47] <NigeySWales> fsphil, great thanks, and you ?
[20:47] <jonsowman> jkominar: uh... sorry about this
[20:47] <jonsowman> http://habhub.org/predict/#!/uuid=e19190c9dc58d357b1e4fbc3ea0bfc4ddb0c4d5e
[20:47] <fsphil> ah the usual :)
[20:48] <NigeySWales> :)
[20:49] <NigeySWales> i think i have my code wrong for my sensors
[20:50] <fsphil> ooh, what's it doing?
[20:50] <NigeySWales> well, output seems normal, but the code layout just looks a bit wrong
[20:50] <russss> DanielRichman: install fail2ban, it firewalls off hosts who make too many failed logins. Cleans up the log spam a treat.
[20:50] <russss> (and really easy to install, especially on debian
[20:50] <russss> )
[20:50] <DanielRichman> russss: I don't like fail2ban
[20:51] <russss> fair enough
[20:51] <DanielRichman> anyone who can put messages into syslog can ban arbitrary hosts
[20:51] <russss> ah, that's true
[20:51] <DanielRichman> but the cleaning up of logs is a fair point
[20:51] <russss> I don't usually care about internal attacks
[20:51] <NigeySWales> fsphil, http://pastebin.com/3dUT5gHR
[20:52] <jkominar> jonsowman: yeah - so I guess we'll wait and see what the 27/28th launch window looks like ;-) Or ... hire a boat.
[20:53] <jonsowman> mm yes
[20:53] <NigeySWales> its not that far off shore, a pair of swimming trunks will do fine ;):P
[20:53] <jkominar> that's probably the furthest east I've ever seen a prediction go. Maybe I really do have to cut a few "speed holes" in our oversized parachute afterall
[20:55] Nick change: laurence__ -> Laurenceb
[20:55] <Laurenceb> SpeedEvil: can you get raw video offf the n900 camera?
[20:56] <SpeedEvil> Laurenceb: Yes, but, depending on what you mean by raw, it may be tricky.
[20:56] <fsphil> NigeySWales, seems fine
[20:57] <NigeySWales> well, it works so .. just looked a bit odd, like i have a block in the wrong order or something
[20:57] <SpeedEvil> http://fcam.garage.maemo.org/apiDocs.html
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[20:58] <jonsowman> hi jcoxon
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[20:59] <Laurenceb> SpeedEvil: i was thinking of trying the hearbeat extraction trick
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[20:59] <Laurenceb> looks like it requires raw video at >10frames/sec
[20:59] <jcoxon> hey jonsowman
[20:59] <natrium42> jkominar, wow, the winds are really strong
[20:59] <jonsowman> you pinged earlier?
[21:00] <SpeedEvil> Ah.
[21:00] <jcoxon> oh yes the predictor was being funny
[21:00] <SpeedEvil> Laurenceb: why raw?
[21:00] <jonsowman> jcoxon: oh sorry
[21:00] <Laurenceb> mpeg would remove the high frequency artifacts its picking up on
[21:00] <jonsowman> you can `sudo -u www-data ~jon/cleardata.sh`
[21:00] <SpeedEvil> ah
[21:01] <natrium42> jkominar, could launch from KIncardine
[21:01] <jcoxon> jonsowman, it was jkominar asking, but good to know
[21:01] <Laurenceb> you need to find signal components in the green channel that arent in the blue or red
[21:01] <SpeedEvil> I know it can be done, but I don't know how trivial it is.
[21:01] <Laurenceb> they are very small, but over a few seconds you can get heartbeat data
[21:01] <jonsowman> jcoxon: yea it's fixed now. just fyi in the future
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[21:02] <SpeedEvil> neat
[21:02] <jkominar> Natrium: have NO desire to slog through the Kawartha forests and lakes trying to recover my payload :)
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[21:02] <NigeySWales> hi jcoxon
[21:02] <jkominar> We'll wait until it's gonna land somewhere between Lake Huron and the west-end of Lake Ontario
[21:02] <Laurenceb> itd really need object tracking to be usable in real life
[21:02] <SpeedEvil> Laurenceb: I wish there was a nice way to extract glucose.
[21:03] <Laurenceb> reversing the problem, - wonder if itd be useful for computer vision
[21:03] <jkominar> A few weeks ago, launching from Goderich, the predictor suggested it'd fly 10km and then land due east of the launch spot.. but we weren't quite ready to go then. I just need another of those days :)
[21:03] Action: jcoxon is sifting through the flight data to write the qsl cards
[21:03] <Laurenceb> check if suspected people are real by looking for heartbeat
[21:03] <Laurenceb> also - do it on a hacked kinect :P
[21:04] <Darkside> hey all
[21:04] <SpeedEvil> http://www.engadget.com/2010/08/23/nokia-n900-does-real-time-face-tracking-for-verification-video/
[21:04] <Laurenceb> makes the tracking easier
[21:04] <Laurenceb> oh cool
[21:04] <SpeedEvil> I wish you could easily use >1 kinect
[21:04] <Laurenceb> bbl - weekly dose of fail on tv
[21:04] <SpeedEvil> The IR field interacts,, so you can't.
[21:04] <SpeedEvil> wave
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[21:15] <natrium42> jkominar, you're right, it's better to wait for more favourable conditions...
[21:15] <natrium42> however jetstream is faster on average in winter
[21:15] <natrium42> :S
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[22:01] <jonsowman> hi juxta
[22:02] <juxta> morning Jon
[22:02] <jonsowman> how's things?
[22:02] <juxta> not too bad I think
[22:02] <juxta> though it's still early in the day
[22:02] <juxta> plenty of time for things to go wrong ;p
[22:03] <jonsowman> haha, I like the optimism
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[22:03] <juxta> stilhmm,
[22:03] <juxta> argh, my irc client isnt responding
[22:03] <jonsowman> hehe
[22:04] <juxta> what i was going to say was that I still haven't heard back from the gps man :(
[22:04] <jonsowman> ah right :(
[22:04] <jonsowman> that's sad
[22:04] <juxta> yeah
[22:05] <juxta> i think i have a contact number for him
[22:05] <jonsowman> still, thank you for trying
[22:05] <juxta> just looking for his card now
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[22:09] <juxta> I've got a number, and another email address - will give that a shot too
[22:09] <jonsowman> excellent
[22:09] <jonsowman> thanks :)
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[22:11] <juxta> no worries
[22:12] <juxta> i checked the results from the other day to see how accurate the predictor was
[22:12] <jonsowman> oh right
[22:12] <jonsowman> what did you find?
[22:12] <juxta> (as in when it was running during the flight)
[22:12] <jonsowman> yep
[22:12] <juxta> during asc it was within 20-50km owing to a varying asc rate, sometimes had some outliers (100km or so)
[22:13] <Lunar_Lander> hello
[22:13] <juxta> after burst it was within 5km
[22:13] <jonsowman> :D
[22:13] <juxta> then below about 10km alt within 1km
[22:13] <juxta> barely even moved
[22:13] <jonsowman> not bad :D
[22:13] <juxta> lucky too, cause we couldnt get to the landing site for a while
[22:13] <juxta> morning Lunar_Lander
[22:14] <Lunar_Lander> did you calculate the great circle distance between actual landing and predicted landing?
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[22:14] <juxta> i did it in my mapping software - not sure if it does great circle or just treats them as 2 points on a plane... the difference would be very small over 10km or so anyway :)
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[22:15] <Lunar_Lander> cool
[22:15] <Lunar_Lander> well done
[22:16] <juxta> i just stole the code maintained by jonsowman and others, no credit to me
[22:19] <Lunar_Lander> yea
[22:26] <Lunar_Lander> best hair: http://spaceflight.nasa.gov/gallery/images/shuttle/sts-124/hires/s124e008613.jpg
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[22:42] Action: Laurenceb has solved the fldigi sdr glitch issue
[22:42] <Laurenceb> or rather i know why it happens
[22:42] <Randomskk> oh?
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[22:42] <Laurenceb> due to dodgey nanosleep delay
[22:42] <Laurenceb> fldigi is sampling about 0.1% slower than 8ksps
[22:42] <Laurenceb> so data builds up in the fifo
[22:43] <Randomskk> aah
[22:43] <Randomskk> oops
[22:43] <Laurenceb> theres a limit of 64KB or 4s lag
[22:43] <Randomskk> right, yea
[22:43] <Laurenceb> thenit starts dropping data
[22:43] <Randomskk> I can see how that'd go horribly wrong with a fifo you are loading with data at a constant rate
[22:43] <Laurenceb> and the stop/start transitions goes screwy and fldigi loses loc on the bits
[22:44] <Laurenceb> it usually appears between 1 or 4 minutes after i start everything running
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[22:44] <Laurenceb> seems depending on how fast fldigi loads the wav stream it starts with more or less data in the fifo
[22:45] <Laurenceb> usually takes 1 or 2 seconds to start running after opening
[22:45] <Laurenceb> guess i could hack it by fudging the resampling factor
[22:45] <Laurenceb> but baud rates would be slightly off
[22:46] <Randomskk> basically this comes down to needing a better rtty decoder again
[22:46] <Laurenceb> however, seems from the way it behaves atm that fldigi can adjust quickly to track the stop/start bit edges
[22:46] <Laurenceb> thats actually a massive flaw
[22:47] <Laurenceb> as noise stop bits can screw up many characters
[22:47] <Laurenceb> *noisey
[22:48] <Laurenceb> i was thinking of dropping fldigi and trying a custom psk decoder in python
[22:49] <Laurenceb> using LDPC over a ~256bit packet, and a pseudorandom header
[22:49] <Laurenceb> pycodes can handle all the hard stuff, and ldpc encoding on 256bits or so is easy with an avr at the tx end
[22:51] <RocketBoy_> rjharrison_: thanks - I'll look out for the tracker tomorrow
[22:51] <Laurenceb> i want to try this heart rate direct from video trick now- seems to good to be true
[22:51] <Laurenceb> too many projects lol
[22:52] <RocketBoy_> looks like the kaunch could be Friday now as Saturday is looking poorer
[22:56] <SpeedEvil> Laurenceb: not reading the paper - is this just a colourimiter hooked to a pll?
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[22:56] <Laurenceb> no exactly
[22:57] <Laurenceb> rgb into a adaptive noise cancelling algorythm
[22:57] <SpeedEvil> ah
[22:57] <Laurenceb> with green as signal and red and blue as noise reference
[22:57] <Laurenceb> also reduce resolution by miles to get better SNR
[22:58] <Laurenceb> needs a stationary field of view
[22:58] <SpeedEvil> hmm
[22:58] <Laurenceb> but if you added feature tracking...
[22:58] <SpeedEvil> Or an IR channel
[22:59] <Laurenceb> with the output they have i dnt see why you couldnt do blood oxygen determination as well
[22:59] <Laurenceb> heh they could use it on airport cctv
[22:59] <Laurenceb> highlight extemely nervous people
[23:01] <Laurenceb> tbh im not convinced, i mean if true itd work on any non compressed clean video
[23:03] Action: Laurenceb pictures video stream with heartrate popping up above each person
[23:04] <Randomskk> to be honest the market here is clearly more interactive porn
[23:04] <Laurenceb> lol
[23:05] <Laurenceb> hmm no raw pron videos avaliable
[23:05] <Laurenceb> would have nice heartrate profiles to try and recover
[23:07] <SpeedEvil> Laurenceb: Add FLIR, and get skin-temp too.
[23:07] <Laurenceb> the point is it requires no specialist kit
[23:08] <SpeedEvil> yes.
[23:08] <Laurenceb> _any_ camera
[23:09] <SpeedEvil> Pulses can often be visible on the body, if you know where to look.
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[23:09] <SpeedEvil> With adequate SNR, you coould pull this from a 3d model extracted from multiple cameras.
[23:09] <SpeedEvil> Though that requires better info.
[23:09] <SpeedEvil> higher res
[23:10] <Laurenceb> apparently you can get detter info from colour changes
[23:10] <Laurenceb> G vrsus red and lue
[23:10] <Laurenceb> *green
[23:10] <SpeedEvil> yeah.
[23:10] Action: Laurenceb needs backlit keyboard
[23:10] <SpeedEvil> Learn to type. :)
[23:10] <Laurenceb> trying to type in dark
[23:10] Action: SpeedEvil is typing under the blankets.
[23:11] <Laurenceb> eww
[23:11] <SpeedEvil> Electric blanket is toasty.
[23:11] <Laurenceb> that just sounds wrong
[23:11] <Laurenceb> heh
[23:12] <Laurenceb> adaptive noise cancelling is a pretty cool trick
[23:12] <SpeedEvil> Lots of this sort of stuff hasn't really been explored.
[23:13] <Randomskk> so the MoD recently tested some gun firing locator stuff
[23:13] <SpeedEvil> For example, imagine cheap tool that you can run over old video, and ID people.
[23:13] <Randomskk> microphone array, detects muzzle fire noise, detects crack as bullet goes past, gives bearing and distance in less than a second
[23:13] <SpeedEvil> yeah.
[23:14] <Randomskk> little box you shove on a shoulder with a dangly lcd
[23:14] <Randomskk> neat
[23:14] <SpeedEvil> Getting it reliable and fieldable is hard.
[23:14] <Randomskk> indeed
[23:14] <Randomskk> gets confused by sound reflections, lots and lots of gunfire, etc
[23:14] <Randomskk> mod approved this one for field use though
[23:14] <Laurenceb> mount it on a blimp
[23:14] <Randomskk> blimp'd get shot :P
[23:14] <SpeedEvil> Have to be an armoured blimp.
[23:14] <Laurenceb> need a really sensitive microphone
[23:15] Action: SpeedEvil imagines blimp with 200mm of rolled homogenous steel armour.
[23:15] <Laurenceb> high altitude blimps
[23:15] <Randomskk> hmm, 8bit r2r ladder, or 10bit timer doing pwm through a good filter to get a dds sine wave out my microcontroller?
[23:15] <SpeedEvil> DDS at what frequency.
[23:15] <Laurenceb> depends on bandwidth
[23:15] <Randomskk> output 1khz tone, let's say I can do a couple megahertz pwm on the timer
[23:16] <Laurenceb> seriously - moored blimps over bagdad
[23:16] <Laurenceb> with sensitive mics, and gps on each one
[23:16] <Laurenceb> get fixes on all gunfire in the city
[23:16] <SpeedEvil> Randomskk: I assume you don't want to throw external hardware at it?
[23:17] <Randomskk> SpeedEvil: nothing beyond either the 20 odd resistors for the ladder, or the Ls and Cs for a filter
[23:17] <SpeedEvil> Randomskk: PWM sounds sanest
[23:17] <Randomskk> excellent
[23:17] <SpeedEvil> Randomskk: Depending on how many timers you have.
[23:17] <Randomskk> sufficient
[23:18] <SpeedEvil> Also - why do you need a sine
[23:18] <Randomskk> sines expected on the other end
[23:18] <SpeedEvil> ah
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[00:00] --- Thu Nov 18 2010