highaltitude.log.20120218

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[00:04] <fsphil-laptop> You can't stop the signal
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[00:55] <navrac_> these rfm22's are pretty sensitive receivers too
[00:56] <Darkside> navrac_: oh?
[00:56] <Darkside> are you transmitting from one to the other?
[00:57] <navrac_> yes 512baud, 10mW 1cm aerials through three walls and 20m apart - no packet loss
[00:57] <Darkside> 512 baud, what mode
[00:57] <navrac_> fsk
[00:57] <Darkside> hrmm
[00:58] <navrac_> 5khz deviation
[00:58] <Darkside> ahh
[00:58] <Darkside> ok
[00:58] <Darkside> i need to be able to transmit signals out of a ham radio
[00:58] <navrac_> actually one has no aerial at all
[00:59] <navrac_> well im working on im allowed 100mW at 458mhz
[00:59] <Darkside> 458MHz?
[00:59] <navrac_> going to try dropping the power -yep 458 is a remote control frequency
[01:00] <navrac_> uk only though
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[01:03] <navrac_> down to 2mW and still going strong
[01:05] <navrac_> 1mW - minimum power - still going
[01:06] <navrac_> ok - going for 4 walls and 25m range
[01:07] <Darkside> walls are mostly invisible to RF at that frequency
[01:09] <navrac_> double brick walls are worth aboyt 5db from memory
[01:09] <navrac_> I lost the signal at about 80 -100m
[01:10] <Lunar_Lander> hi navrac, Dark
[01:10] <Lunar_Lander> Darkside:
[01:10] <navrac_> and interestingly the carrier was at the level i would be hard pushed to decode it from the scanner
[01:11] <navrac_> so i suspect with 100mW and a quater wave at each end it will do a very good range, so I think its going to make a nice cheap uplink
[01:12] <navrac_> hi lunar
[01:14] <navrac_> the temp sensor on the rfm22's works fine but the rssi is next to useless as you cant measure it whilst receiving as the cpu is tied up at that point
[01:24] <Lunar_Lander> good night
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[02:18] <Pavix> Foolishly, I havent looked at prices of parachutes until just now. Holy crap, they're almost as much if not more than the balloon
[02:25] <dehuman> do mars lander style
[02:25] <dehuman> air bags
[02:25] <dehuman> junk yard
[02:25] <dehuman> done and done
[02:25] <dehuman> btw i only half said that in jest
[02:25] <dehuman> chutes are expensive but if you cant afford a big enough one or need alternate back up maybe airbags
[02:27] <Pavix> Hmm, I found a site that can do a decent sized one at about $75
[02:27] <Pavix> The cost of the chute is pretty minor to the cost of the electronics inside
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[02:29] <Pavix> Between the arduino uno, logger shield, lassen IQ GPS, openlogger, BMP085, the Samsung PL20 for HD video, the A560 for stills, the prepaid android phone for recovery I'm probably over $250 easy. Not to mention the sd cards
[02:31] <Pavix> And the chute, like the electronics, is reusable.
[02:31] <Pavix> *hopefully
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[02:49] Nick change: MLow -> MLow-werk
[02:49] <MLow-werk> im here woo
[02:51] <MLow-werk> Pavix: ping
[02:51] <MLow-werk> HD video is overratted
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[03:44] <Pavix> Maybe, but it was silly cheap
[03:44] <Pavix> Like $70
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[03:57] <Pavix> The only bad part is, now that I've got it apart there's no easy way to solder leads to the power connections to use an external power supply
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[05:34] <SamSilver> http://www.theregister.co.uk/2012/02/16/lightsquared_spectrum_swap/
[05:37] <Pavix> Probably better to keep noise away from GPS bands
[05:47] <SamSilver> yip
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[06:02] <Pavix> So if it's difficult to get helium, is hydrogen gas more difficult to use safely
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[06:25] <natrium42> Pavix: yeah, it's flammable
[06:25] <natrium42> helium is noble
[06:28] <Pavix> So even if I have to travel to surrounding towns 20-30 miles away, it's worth getting helium vs dealing with hydrogen, gotcha
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[06:29] <natrium42> have you launched before? i'd use helium for your first launches, fewer things to worry about
[06:29] <natrium42> it's possible to be safe with hydrogen, but your head will be full with other things, so you could make some mistakes
[06:30] <Pavix> first launch
[06:31] <natrium42> go with helium
[06:31] <natrium42> where are you based, btw?
[06:31] <Pavix> The US, Iowa
[06:33] <natrium42> there are some HAB groups there that you could get in touch with
[06:34] <natrium42> http://arhab.org then go to Members
[06:36] <Pavix> Thanks
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[07:46] Nick change: daveake_ -> daveake
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[08:18] <griffonbot> @LVL1WhiteStar: Eureka, we just got "HELLO WORLD" from an Arduino direct to an #Iridium satellite in space, round the world and to our email inbox! #UKHAS [http://twitter.com/LVL1WhiteStar/status/170784111533891585]
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[08:22] <x-f> woo!
[08:25] <x-f> i really hope they will launch this winter / spring
[08:25] <x-f> also - i admire Dan's dedication
[08:31] <fsphil-laptop> they've done a serious amount of work on this
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[08:41] <Upu> personally can't wait
[08:42] <natrium42> yeah, looking forward to it
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[08:42] <Upu> if they manage to cut down over the UK that would be quite something else
[08:42] <Upu> I suspect the predictor will be getting some heavy use that day
[08:42] <daveake> There'd be a race to receover it!
[08:42] <Upu> lol
[08:43] <Upu> wonder if we can persuade him to put a 70cms beacon on it too ?
[08:43] <fsphil-laptop> ooh
[08:43] <daveake> Good idea. One of us could send him one
[08:44] <Upu> yup
[08:44] <Upu> once of the Pico ones I'm doing would work
[08:44] <Upu> I'll speak to him next time he's on
[08:44] <daveake> :)
[08:45] <daveake> I've made a copy of my little (but not as little as yours probably) pico tracker, to replace the one I dunked in the English Channel
[08:45] <Upu> Yours is a amazing but it looks so fragile
[08:46] <daveake> Latter is still working though I think the rfm22b may be down on power
[08:46] <number10> one minute everyones boasting they have a big one, now everyones got a small one
[08:46] <Upu> probably isn't actually but
[08:46] <daveake> number10 lol
[08:46] <Upu> small is the new big in HAB
[08:46] <daveake> No, not fragile, actually
[08:46] <daveake> surprisingly
[08:46] <daveake> But it has that Sarantel which of course is a heavy beast :)
[08:46] <Upu> Hoping to get RFM22B, ATMega, chip antenna and a GPS on a 25mm x 25mm board
[08:47] <daveake> Oh nice
[08:47] <Upu> maybe a little larger
[08:47] <daveake> 26mm then
[08:47] <daveake> :p
[08:48] <daveake> If you do make it larger, maybe make it longer but thinnner for neck applications?
[08:49] <daveake> re size and weight, it's easy (as I've done) to focus on losing the last gram or two, forgetting that the balloon weighs approx 100 times the PCB
[08:49] <Upu> might make it longer and thinner so I can put all the comps on one side so I can reflow it
[08:49] <Upu> anduse it in a neck
[08:50] <Upu> true but for foil balloon ever gram counts
[08:50] <daveake> Indeedy
[08:50] <daveake> Which is where I satrted on this little tracker
[08:51] <natrium42> daveake: shorten the balloon neck
[08:51] <natrium42> :D
[08:52] <daveake> :D
[08:52] <natrium42> and use ultra-thin kevlar rope
[08:54] <daveake> I already weighted the nylon :-). It's not a big factor
[08:55] <daveake> That said I do have some carbon fibre cord for my helis ...
[08:56] <number10> you could also try flix pcb
[08:56] <number10> lexi
[08:56] <number10> flexi
[08:57] <natrium42> number10: meh, i wire wrap my payloads with magnet wire
[08:58] <daveake> Damn, I've been using leaded solder ... that's where I've been going wrong :p
[08:58] <number10> any pics, I bet thats a work of art natrium42
[08:59] <natrium42> number10: i have done it in the past though
[08:59] <natrium42> but i was kidding
[09:00] <natrium42> http://natrium42.com/gallery2/v/misc/IMG_0035.JPG.html
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[09:02] <number10> ic
[09:02] <number10> noce job though - some of the guys at work do that when testing small smd boards
[09:02] <natrium42> meh, pcb doesn't weigh that much
[09:03] <natrium42> especially when you go with 0.1" pcb
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[09:04] <Darkside> i use 0.8mm
[09:06] <natrium42> even better :)
[09:07] <number10> there was a project at work that they wanted very thin -for the prototype they went to the extreeme of filing some of the ICs
[09:09] <natrium42> haha
[09:10] <Upu> morning Darkside
[09:19] <daveake> PicoBuzz #2 works :)
[09:19] <Upu> it lives :)
[09:19] <daveake> :D
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[09:38] <number10> when are you thinking of sending it up daveake ?
[09:39] <daveake> Have applied for a regular launch for 24th March. Might do a foil one before then depending on the winds
[09:41] <number10> do they do really small cyclinders, or will you hire a larger one for both launches
[09:42] <daveake> Yeah you can get small disposable ones
[09:42] <daveake> A friend has one I could use
[09:43] <number10> I have seen those - someone here commented and said there was a mix of gas in them - but I dont know how true that is
[09:43] <daveake> Yeah I heard that. No use if so
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[09:52] <Upu> did anyone get a screen shot of the tracker from the launch last weekend with all the trackers on it ?
[09:52] <fsphil> I've a habhound screen shot on my laptop at home
[09:53] <Upu> needs to be spacenear screen shot really as I'm doing a presentation on it
[09:53] <Upu> well the whole habby thing
[09:53] <Darkside> do you want a screenshot of heaps of trackers tracking a single balloon?
[09:53] <Darkside> because i've done that before
[09:53] <Upu> I have yours actually
[09:53] <Upu> thats the one I'm using at the moment but would prefer a UK based one
[09:53] <Darkside> pff
[09:53] <Upu> no offense :)
[09:53] <fsphil> lol
[09:54] <Darkside> its a good one!
[09:54] <Darkside> the entire UK fits within that picture
[09:54] <Upu> I'll use that one :)
[09:54] <Darkside> theres a great pic somewhere showing europe overlaid upon australia
[09:54] <Upu> yeah but its all sand and snakes and spiders
[09:54] <Darkside> theres farming properties in western australia that are BIGGER than many european countries
[09:58] <daveake> Something to note about the rfm22b .... I've got two running here, at the same temp and both set to the same frequency. They're about 8kHz apart
[09:58] <Darkside> pff
[10:00] <daveake> Pleased to see that the dunked one isn't actually down on power :)
[10:01] <number10> I have a shot of me receiving darkside at 40369 - but you dont want that rubbish ;)
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[10:12] <fsphil> how good are the rfm22b's as actual modems? (using the build in modulations)
[10:12] <daveake> No idea - I've only done rtty with them
[10:34] <fsphil> oh look, fedex sent me a .exe file in a .zip file that i have to open to print ....
[10:34] <daveake> !!!
[10:34] <daveake> Don't think I'd be opening it :)
[10:34] <fsphil> from korea
[10:34] <daveake> lol
[10:34] <fsphil> one of my bosses did
[10:34] <fsphil> thankfully it was caught and quarantined
[10:35] <daveake> Shame; a lesson would have been taught
[10:35] <SpeedEvil> I've just won the national lottery.
[10:35] <SpeedEvil> Which surprised me.
[10:35] <SpeedEvil> What with the whole not-buying-a-ticket thing.
[10:36] <daveake> Cool. I've inherited $10M from Nigeria
[10:36] <fsphil> sweet
[10:36] <fsphil> that dear old general
[10:36] <SpeedEvil> I did actually buy a ticket once, just in case someone was really up there, and wanted to give me something.
[10:36] <daveake> You inherited too?
[10:36] <SpeedEvil> You never know.
[10:38] <daveake> In the last 2 weeks I've had 3 phone calls "We understand that someone at your address has had a car accident in the last 3 years"
[10:38] <daveake> and one "I'm calling about your slow computer"
[10:38] <fsphil> "No, but someone at your address may be about to have a car accident"
[10:38] <daveake> lol
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[10:38] <daveake> One day when I'm bored I'll strong them along
[10:38] <fsphil> I've heard about the computer callers here in the office
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[10:39] <fsphil> a few people have gotten them, who don't own computers
[10:39] <daveake> I replied "Oh, so you';re calling to try to scam me then?"
[10:39] <fsphil> "How did you know I was using a Commodore 64?"
[10:40] <number10> dont start us off fsphil ;)
[10:40] <daveake> :D
[10:40] <fsphil> I wonder what the scam is though
[10:40] <fsphil> are they trying to infect the pc
[10:40] <daveake> Yep
[10:41] <number10> they dont need to do that mine already has microsoft os
[10:41] <daveake> lol
[10:41] <daveake> If you have Norton on there then it truly is buggered
[10:41] <fsphil> urg
[10:42] <daveake> "We're calling about your slow computer" ... "Ah, yes, can you help me get it to transmit at 300 baud please?"
[10:42] <daveake> "Sorry I can't reboot it. It's fluing at 35km right now"
[10:42] <daveake> flying
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[11:00] <daveake> In case anyone still needs help with this - http://thumbsnap.com/s/ztJHHCqw.jpg :-)
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[11:12] <WillDuckworth> anyone around to upload a payload string?
[11:12] <WillDuckworth> http://pastebin.com/GT4wTVGT
[11:19] <cuddykid> WillDuckworth: try posting on #habhub - it was much quicker there :)
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[11:30] <GW8RAK> Completely boring announcement to most people, but I'm pleased as punch. I've got my 817 working again!!!! Woo Hoo. :)
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[11:34] <fsphil> HOW?
[11:34] <fsphil> er
[11:34] <fsphil> how? :)
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[11:40] <GW8RAK> Just traced the power supply side and it's working.
[11:41] <GW8RAK> Had to replace a couple of blown components, as in blown off the board.
[11:41] <GW8RAK> It did make a loud bang when it went
[11:42] <GW8RAK> Didn't have any R's or C's of the right size, so stood larger ones on end and made a wire link to what was the other end of the component.
[11:42] <GW8RAK> Tried it in a power meter and it tx's.
[11:42] <GW8RAK> Now to try it on air.
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[11:48] <fsphil> that's brilliant
[11:48] <fsphil> that was ages ago wasn't it/
[11:48] <fsphil> ?
[11:50] <GW8RAK> It's taken me a long time to get the motivation to get going on it again.
[11:50] <GW8RAK> ha ha, just had a 70cm QSO on the calling channel.
[11:51] <GW8RAK> Since 70 is so quiet, I said that if we stayed on the calling channel, I'm sure one of the band police would come up and tell us to move.
[11:51] <GW8RAK> Never hear anyone on there and sure enough someone came up.
[11:52] <GW8RAK> After we finished I called him, but he didn't come back.
[11:52] <GW8RAK> What an idiot! :)
[11:55] <Upu> lol
[11:55] <Upu> sounds about right
[11:58] <GW8RAK> There's a local net along the north wales coast on 434.750. They go there and treat it as their own channel. Woe betide anyone who goes there without permission.
[11:58] Action: SpeedEvil plays the 'Deliverance' music.
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[12:10] <fsphil> anything on 70cm is impressive
[12:10] <fsphil> I don't think I've heard anyone except for satellites, and one nearby repeater
[12:15] <Darkside> heh
[12:15] <Laurenceb_> anyone here interested in an STM32F4+GPS dongle?
[12:15] <Darkside> we have a *Really* good 70cm repeater here in adelaide
[12:15] <SpeedEvil> Laurenceb: yes!
[12:15] <Laurenceb_> im probably going to design a pcb
[12:15] <Laurenceb_> im thinking usb dongle
[12:15] <SpeedEvil> Laurenceb: +INS?
[12:15] <Laurenceb_> no
[12:15] <SpeedEvil> Aww
[12:15] <Laurenceb_> usb dongle
[12:15] <Laurenceb_> with some gpio
[12:16] <SpeedEvil> Laurenceb: What are you thinking of?
[12:16] <Laurenceb_> so you could leave usb port unpopulated
[12:16] <Laurenceb_> just for dev work
[12:16] <SpeedEvil> Laurenceb: Full GPS position out/NMEA?
[12:16] <SpeedEvil> ah - this is v0.1
[12:16] <SpeedEvil> Fair enough
[12:16] <Laurenceb_> yes
[12:16] <Laurenceb_> and also maybe just gps data, code offset and phase
[12:16] <Laurenceb_> for final version
[12:16] <SpeedEvil> Can you also add a GPS transmitter, for the lulz?
[12:16] <SpeedEvil> :)
[12:16] <Laurenceb_> then it goes into a kalman
[12:16] <Laurenceb_> heh
[12:17] <Laurenceb_> i want it to be small
[12:17] <Laurenceb_> sma->gps frontend->f4->usb port
[12:17] <SpeedEvil> SQW?
[12:17] <SpeedEvil> SQW
[12:17] Last message repeated 1 time(s).
[12:17] <SpeedEvil> argh
[12:17] <SpeedEvil> SQW
[12:17] <SpeedEvil> Oh, I don't believe this.
[12:17] <Laurenceb_> wut?
[12:17] <SpeedEvil> SAW
[12:17] <Laurenceb_> oh
[12:17] <Laurenceb_> lol
[12:17] Action: SpeedEvil fails epically at typing.
[12:17] <Laurenceb_> i dont know
[12:18] <Laurenceb_> im looking for front ends atm
[12:18] <SpeedEvil> I suppose not needed for a test version.
[12:18] <Laurenceb_> SE4110L at digikey
[12:19] <fsphil> GW8RAK, what frequency on 70cm? I might give a shout later and see if anyone is listening
[12:19] <GW8RAK> 433.500
[12:19] <fsphil> ah yes
[12:20] <GW8RAK> the so called "calling channel"
[12:20] <GW8RAK> There's always someone listening around here, but very little traffic
[12:20] <SpeedEvil> Laurenceb: It's a pity that it's more complex to do it that way, rather than a generic VCO + mixer +ADC which would work for anything
[12:20] <SpeedEvil> err - much simpler
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[12:42] <Darkside> http://www.youtube.com/watch?v=uOUFKZBpFTY <-- our previous prime minister
[12:44] <fsphil> about as happy as our previous PM
[12:45] <Darkside> hehe
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[12:51] <Laurenceb_> SpeedEvil: ill probably use http://search.digikey.com/uk/en/products/SE4120L-R/863-1352-6-ND/2745432
[12:51] <navrac_> anyone good at c round at the moment?
[12:51] <Randomskk> maybe
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[12:52] <navrac_> ah good 'cos im rubbish at it!
[12:52] <SpeedEvil> I'm also rubbish at it, but I'm probably differently rubbish than you
[12:52] <SpeedEvil> Laurenceb: Price is rigth!
[12:53] <Randomskk> navrac_: ask away
[12:54] <navrac_> Theres a structure in the rf22 library defined as : typedef struct{uint8_t reg_1c;uint8_t reg_1c} modemconfig;
[12:55] Action: SpeedEvil wishes you could friction-stir-weld wood
[12:55] <Laurenceb_> SpeedEvil: yeah, and $10 for the stm32f4
[12:55] <navrac_> so if i want to use it to pass to a procedure I'm trying:
[12:55] <Laurenceb_> maybe $20 for the whole receiver
[12:55] <navrac_> struct ModemConfig myconf={ 0x2b, 0x03};
[12:56] <navrac_> then rf22.setModemRegisters(myconf);
[12:56] <Laurenceb_> hehe
[12:57] Action: Laurenceb_ is using same lib on stm32
[12:57] <navrac_> all i want to do is put some values into a call, but it wont let me do rf22.setModemRegisters(0x2b,0x03); which i thought woukld be easy
[12:58] <Laurenceb_> i havent used it low level like that
[12:59] <Randomskk> navrac_: try like
[12:59] <navrac_> I've avoided c for years, sadly I'm stuck having to use it now
[12:59] <Randomskk> struct modemconfig mc;
[12:59] <Randomskk> mc.reg_1c = 0x2b;
[12:59] <Randomskk> uhm, did you make an error copy/pasting the struct definition?
[13:00] <Randomskk> I assume it doesn't have two fields both called reg_1c
[13:00] <Randomskk> anyway set the other field in the same way
[13:00] <Randomskk> then rf22.setModemRegisters(mc)
[13:01] <navrac_> pasting error
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[13:12] <navrac_> sorry phone rang - what im trying to avoid is using the mc.reg_1c method as it has 13 entries not just the two i put in the example - i was hoping there was a way of passing the whole array
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[13:16] <navrac_> I get the error error: variable 'ModemConfig myconf' has initializer but incomplete type when i tried passing all the members in brackets
[13:16] Action: costyn just soldered his first perfboard.. ntx2 to the perfboard, hope it all still works (probably not konwing my luck)
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[13:20] <Randomskk> navrac_: try
[13:20] <Randomskk> modemconfig mc = { .reg_1c = 0x0b, .reg_1d = .... };
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[13:24] <navrac_> ok 18 members - may take me some time!
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[15:10] <CovBalloon> My body is telling me its Sunday
[15:10] <CovBalloon> :(
[15:12] <Pavix> That's no good
[15:13] <eroomde> thats fine
[15:13] <eroomde> 2 lazy sundays
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[15:18] <Pavix> hmm, whoever did the Cygnus balloon is pretty smart, I like that emergency cutdown device
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[15:26] <x-f> it was Tiger^
[15:28] <Pavix> Pretty smart to have something that can cut your payload away from the balloon
[15:32] <fsphil-laptop> yay, finally we've got some snow
[15:38] <Upu> snow ?
[15:38] <Upu> its sunny outside
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[15:39] <fsphil-laptop> nice heavy fall of snow here atm, not lying yet though
[15:40] <eroomde> Pavix: link?
[15:40] <eroomde> just rain here
[15:45] <eroomde> tis just lots of habs have had some sort of cut-down device, historically
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[15:54] Nick change: daveake_ -> daveake
[15:55] <Laurenceb_> eroomde: would you be interested in astm32f4+gps dongle?
[15:55] <Laurenceb_> im deisgning a pc
[15:55] <Laurenceb_> *pcb
[15:56] <eroomde> what kinda gps?
[15:57] <Laurenceb_> software defined
[15:57] <Laurenceb_> SE4120 (same as badger2) +stm32f4
[15:57] <Laurenceb_> on a usb stick
[15:58] <Laurenceb_> with sma connector on the end
[15:59] <Laurenceb_> it looks like its possible to have 16channel gps on F4 with 4Msps sampling
[15:59] <Laurenceb_> so im going to build it
[16:00] <eroomde> if it could just throughput raw se4120 to a pc, that'd be cool too
[16:01] <eroomde> cos the official dongle is like £250
[16:03] <Laurenceb_> yeah
[16:04] <Laurenceb_> im not 100% sure
[16:04] <Laurenceb_> official dongle uses usb2 high speed
[16:04] <Laurenceb_> but full speed is theoretically 12Mbps
[16:04] <SpeedEvil> Laurenceb: I assume there is plenty of grunt on the 32 to do position solution too?
[16:04] <SpeedEvil> If you chose to.
[16:04] <Laurenceb_> and se4120 is 8Mbps
[16:05] <Laurenceb_> easily
[16:05] <Laurenceb_> thats trivial compared with tracking
[16:05] Action: SpeedEvil wonders on applications.
[16:05] <SpeedEvil> Does the F4 have a cam interface - I forget
[16:05] <Laurenceb_> iirc someone has done gps pos solutions on arduino
[16:05] <SpeedEvil> Wacky
[16:05] <Laurenceb_> using ublox raw output
[16:05] <Pavix> eroomde: http://moo.pl/~tygrys/balloon/
[16:07] <Laurenceb_> SpeedEvil: it does
[16:07] <Laurenceb_> but SE4120 has spi output
[16:07] <Laurenceb_> much easier to process
[16:07] <Laurenceb_> its crazy cheap - BOM comes to $20
[16:07] <SpeedEvil> Oh - I was meaning to attach a camera to :)
[16:08] <Laurenceb_> with pcb, SAW filter, 0.5ppm tcxo and stm32f4 with 1Mflash, 192K ram
[16:08] <SpeedEvil> Cat-cam
[16:08] <Laurenceb_> lol
[16:08] <Laurenceb_> http://search.digikey.com/uk/en/products/STM32F405RGT6/497-11767-ND/2754208
[16:08] <Laurenceb_> so cheap
[16:08] <SpeedEvil> So each pic would be stamped with position, and direction
[16:09] <Laurenceb_> i was thinking of something a little more useful :P
[16:09] <SpeedEvil> Well - that was the beta test platform.
[16:09] <Laurenceb_> another nice thing you could do is share the tcxo between multiple boards
[16:09] <SpeedEvil> The real one goes on a pigeon.
[16:10] <Laurenceb_> so phase lock them and do attitude
[16:10] <SpeedEvil> With three helmholtz coils to screw with its magnetic sense.
[16:11] Action: SpeedEvil has spent today making lots of 9mm*10mm sticks.
[16:11] <SpeedEvil> These slide neatly up 10mm polycarbonate sheet.
[16:12] <SpeedEvil> And are fixed through using predrilled holes to short screws.
[16:12] <Laurenceb_> what for?
[16:16] <SpeedEvil> For attaching sheet onto my greenhouse.
[16:16] <SpeedEvil> Without penetrating the outer sheet
[16:16] <Laurenceb_> ah, neat
[16:16] <SpeedEvil> Leaks annoy.
[16:17] <SpeedEvil> Just need to do some pull-tests for various fixing methods
[16:17] <Laurenceb_> ok full BOM with a few indicator leds and JTAG header etc works out at $21
[16:17] <Laurenceb_> including seeedstudio pcb
[16:17] <SpeedEvil> And possibly betas for solar panels.
[16:17] <Laurenceb_> pcb about 15x35mm
[16:18] <SpeedEvil> I'll take a couple of kits, if it'd help reduce price.
[16:18] <SpeedEvil> And to play with
[16:19] <SpeedEvil> Sounds like fun!
[16:20] <Laurenceb_> ill order 10 pcbs from seed then - hopefull it will work out as ~15
[16:20] <Laurenceb_> then solder stencil
[16:20] <SpeedEvil> Brother just got a laser thingy.
[16:21] <SpeedEvil> Friction stir welding looks cool.
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[17:04] <jcoxon> afternoon all
[17:05] <daveake> afternoon
[17:05] <number10> hi
[17:07] <daveake> number10 When you get that mast :-), you might want to know that B&Q sell a "grouns screw" for £12 into which it fits exactly.
[17:07] <daveake> *ground
[17:08] <number10> thats interesting - for grass i assume :)
[17:08] <daveake> Well it's green :)
[17:08] <daveake> Yes, designed to screw into the soil
[17:08] <number10> link available
[17:08] <daveake> I took a micrometer to the store to check the fitting :)
[17:10] <daveake> http://www.diy.com/nav/rooms/indoor-cleaning-laundry/rotary-airers-dryers/outdoor_airers/Ground-Screw-11697717
[17:12] <number10> I will bookmark. cheers - I think als fsphil-laptop got a mast ordered from maplin so maybe of use to him
[17:13] <fsphil-laptop> indeed
[17:13] <daveake> Your one had a Maplin sticker on it and i gave fsphil-laptop the code
[17:13] <fsphil-laptop> despatched, should arrive early next week
[17:13] <daveake> :)
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[17:14] <daveake> Also got some guy rope and have ordered some screw-in things for those.
[17:15] <fsphil-laptop> it doesn't come with the rope/
[17:15] <number10> and you are still in feburarys hab budget
[17:15] <number10> -r
[17:15] <daveake> +'
[17:15] <fsphil-laptop> :p
[17:15] <Laurenceb_> eroomde: im not sure if usb cdc could be capable of replicating the sige sampler
[17:16] <number10> :)
[17:16] <Laurenceb_> eroomde: my datalogger can get about 1.2Mbyte/sec without a hub in the way
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[17:16] <daveake> fsphil-laptop No doesn't come with rope
[17:16] <Laurenceb_> but thats not emulated serial
[17:16] <Laurenceb_> http://forums.leaflabs.com/topic.php?id=33 <- but those benchmarks would suggests its doable
[17:17] <daveake> number10 "budget" is such a variable thing :D
[17:17] <number10> well thats nice
[17:18] <zyp> baudrate with usbcdc is just metadata
[17:18] <number10> i suspect a big HAB? sepnd before april
[17:18] <Laurenceb_> zyp: i know
[17:19] <Laurenceb_> im taking about throughput
[17:19] Action: fsphil-laptop has a 1600g that needs to be launched as soon as possible
[17:19] <Laurenceb_> sige sampler needs 1Mbyte/sec
[17:20] <zyp> so like 8 Mb/s? on a 12 Mb/s usb link?
[17:21] <SpeedEvil> Big buffer helps lots too.
[17:22] <eroomde> agreed on buffer
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[17:22] <eroomde> no guaranatees cos of contention, OS drivers etc
[17:22] <eroomde> and it's polled
[17:22] <Laurenceb_> yeah
[17:23] <SpeedEvil> I wonder how much a tuned filter that attempts to track the signal conditions of a satellite would improve locking. One that models frequency dependant multipath
[17:23] <Laurenceb_> i see massive slowdown if a hub is in the way on my datalogger
[17:23] <SpeedEvil> Remaining locked, I mean
[17:24] <Laurenceb_> SpeedEvil: normally you dither the dll to try and build up a picture of the correlation peak
[17:24] <Laurenceb_> then try and identify multipath distortion and locate the true delay
[17:24] <zyp> my work laptop is having trouble keeping up with my saleae at 24 MHz sample rate
[17:24] <Laurenceb_> but thats some pretty hardcore stuff
[17:24] <zyp> imac at home keeps up fine
[17:24] <Laurenceb_> and isnt needed for airborne stuff
[17:25] <SpeedEvil> I was imagining something like once you're locked, take the know bittstream, and multiply the spreading code by this.
[17:25] <SpeedEvil> To essentially demodulate not the signal, but the spreading code.
[17:26] <SpeedEvil> To get what the 'real' spreading code, after the environments does bad things to it is.
[17:26] <SpeedEvil> And yes, utterly irrelvant to airborne.
[17:26] <Laurenceb_> hmm i think thats kind of the same thing
[17:27] <SpeedEvil> I don't think it quite is.
[17:27] <Laurenceb_> the "proper" technique is to dither the dll or assign spare channels to the same sat
[17:27] <Laurenceb_> then build up a graph of the correlation peak
[17:27] <SpeedEvil> Dithering the DLL will get you the picture of the correlation peak of the transmitted signal.
[17:27] <Laurenceb_> then deconvolve that with a "uncorrupted" peak shape
[17:27] <SpeedEvil> It will not get you the correlation peak of the received signal
[17:27] <Laurenceb_> to get the multipath function
[17:28] <SpeedEvil> Unless I'm being confused, which is possible.
[17:28] <Laurenceb_> then take the first peak that rises above the noise as the direct signal from the sat
[17:28] <Laurenceb_> the rest is multipath
[17:28] <SpeedEvil> I mean to use the multipath.
[17:28] <SpeedEvil> As signal.
[17:29] <Laurenceb_> anyway, i think youd have a really hard time doing this well on F4
[17:29] <SpeedEvil> Indeed.
[17:29] <SpeedEvil> The above requires actual hardware or lots more CPU
[17:30] <SpeedEvil> It's potentially interesting from the 'keeping locked as the user walks into a building' POV
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[17:33] <Laurenceb_> tho - when you have a lock an some sat data you can predict what sats are in view
[17:34] <Laurenceb_> and assign all the spare channels to multipath mitigation
[17:34] <Laurenceb_> so its not _that_ insane
[17:34] <Laurenceb_> a cool trick for balloon would be to save the dopplers then turn for for ~1minute
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[17:35] <Laurenceb_> then do a really fast reaquisition of code and a position lock in ~100ms
[17:35] <Laurenceb_> getting current consumption down to something like 100uA
[17:35] <Laurenceb_> - average
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[17:43] <SpeedEvil> I do wonder if 100ms is really needed
[17:43] <SpeedEvil> I suppose your limit may actually end up as how fast the VCO can lock
[17:44] <SpeedEvil> As you can - for example - turn on at a predicted known bit of signal
[17:44] <Laurenceb_> hmm
[17:44] <SpeedEvil> Just wake up at the time of week word
[17:44] <Laurenceb_> the position may have drifted quite a lot in a minute
[17:44] <Laurenceb_> several times 300m on a balloon
[17:44] <SpeedEvil> hmm
[17:45] <Laurenceb_> so it wouldnt lock
[17:45] <SpeedEvil> I suppose if you've got 4 sat fix, you've got ~4 correlators per sat
[17:45] <SpeedEvil> For rapid reacquisition
[17:45] <SpeedEvil> 8, if you drop down to 2
[17:46] <Laurenceb_> or you could underclk the processor
[17:46] <SpeedEvil> Underclocking tends to be not great
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[17:47] <SpeedEvil> It's a pity the rubidium clocks need that many watts of power
[17:49] <chris_99> why so?
[17:49] <chris_99> what where you thinking of using one for
[17:49] <SpeedEvil> They would be awesome for low-power GPS otherwise.
[17:49] <SpeedEvil> But using a 10W clock so you can mostly shut off your GPS may not be an ideal solution.
[17:49] <chris_99> you mean replacing the crystal and using the rubidium instead
[17:50] <Laurenceb_> max current is about 70ma @3.3v with this design
[17:50] <chris_99> oh just to regulate your output?
[17:51] <SpeedEvil> chris_99: using the rubidium clock as a non-drifitng clock. It simplifies lock.
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[18:02] <SpeedEvil> My god.
[18:02] <SpeedEvil> SCO is still kicking.
[18:02] <SpeedEvil> Ish.
[18:03] <SpeedEvil> http://www.groklaw.net/article.php?story=20120216020813427
[18:05] <daveake> I guessed that would be litigation rather than anything actually useful
[18:06] <fsphil-laptop> maybe some day
[18:09] <SpeedEvil> Well - they're still trying to claim they own linux.
[18:09] <daveake> I think they've been spending the money they made 20 years ago on drugs
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[18:26] <costyn> wait... how is that company still in any form or shape alive?
[18:27] <costyn> there can't still be people who are getting paid to do work for it ... omg
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[18:56] <fsphil-laptop> Amiga still exists, and yet afaik they don't actually produce anything
[18:56] <fsphil-laptop> apart from rebranded android tablets it seems
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[18:57] <fsphil-laptop> which you can't buy
[18:57] <fsphil-laptop> because the shop page 404's
[18:58] <mg169706> Hello. I'm on my first HA balloon project and looking for any advise about teathering the parachute/baloon to the payload box. I'm using a card ice box (expanded polystyrene. Do people suggest putting holes in the box and running lines through or building a cradle? Thank for any advice. Ben
[19:00] <fsphil-laptop> on my own payloads I take two lines, each going under the payload box
[19:01] <fsphil-laptop> taped with duct tape on both sides
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[19:01] <mg169706_> Sorry, my internet connection just died.
[19:01] <fsphil-laptop> hate it when that happens :)
[19:01] <mg169706_> Gotta love sods law
[19:02] <daveake> I've done the through-the-box thing once, but making the holes (all the way through the walls) was a PITA. Usually though I do what fsphil-laptop just said - I run 2 loops one each side of the box, and duct-tape them down
[19:02] <mg169706_> If anyone replied, sorry I missed it
[19:02] <fsphil-laptop> I was just saying that on my own payloads I loop two lengths undernearth the payload box
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[19:03] <mg169706_> I'll give that a go. Thanks for the advice. :)
[19:05] <daveake> Wonder if I should get some of this for my next BBQ .... http://i.imgur.com/GOPVm.jpg
[19:06] <fsphil-laptop> I think they put the O at the wrong end of that name
[19:06] <daveake> :)
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[19:47] <Lunar_Lander> hello
[19:49] <Lunar_Lander> I thought about the 808 camera some more and informed myself about the USB pinout
[19:49] <Lunar_Lander> which is VCC, TX, RX, ID and GND for micro USB
[19:49] <Lunar_Lander> but the camera is different
[19:50] <Lunar_Lander> VCC is in place of ID
[19:50] <Lunar_Lander> somone said on RC Groups IICR that the internal battery popped when he tried to recharge with a HTC adaptor
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[20:15] <chris_99> i'm trying to use \renewcommand{\section}{\newpage\section\newpage}
[20:16] <chris_99> which naturally causes a stack error
[20:16] <chris_99> how do i use the command i'm re-newing
[20:16] <chris_99> within itself
[20:18] <Lunar_Lander> hm
[20:18] <Lunar_Lander> is there a big football match on or so?
[20:18] <Lunar_Lander> quite silent for like a quarter past 8 pm GMT
[20:20] Action: SpeedEvil tries to remember when he last watched a football match.
[20:20] <SpeedEvil> I'd guess >>10y
[20:23] <Lunar_Lander> oh
[20:23] <Lunar_Lander> do you know why everyone is afk?
[20:26] <SpeedEvil> I suspect Laurenceb is screwing with his GPS design.
[20:26] <Lunar_Lander> ah
[20:27] <staylo> For my sins, I'm attempting to learn kicad
[20:27] <Lunar_Lander> ah
[20:30] Action: fsphil-laptop just isn't here :)
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[20:30] <Lunar_Lander> xD
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[20:38] <Laurenceb_> http://bcas.tv/paste/results/U8XKFB93.html
[20:38] <Laurenceb_> interesting
[20:38] <Laurenceb_> hacking an stm to go into bootload mode at runtime
[20:39] <chris_99> oh sorry that message was meant for #latex
[20:48] <Laurenceb_> i just need a way to debug over usb
[20:48] <Laurenceb_> probably not so easy
[20:49] <Laurenceb_> hehe maple use a bootloader in flash to program
[20:49] <Laurenceb_> fail
[20:51] Action: SpeedEvil ponders SW
[20:51] <SpeedEvil> SWDoUSB
[20:54] <Laurenceb_> thats what discovery is
[20:54] <Laurenceb_> SWD to USB
[20:55] <Laurenceb_> FT2232H looks nice - FT2232H+SE4120 would be a simple sige sampler replacement
[20:56] <Laurenceb_> im still suprised by how cheap it is - an f4 gps module would be about $15
[20:57] <OZ1SKY_Brian> Upu are you there?
[20:57] <Upu> evening Brian I'm here
[20:58] <OZ1SKY_Brian> hi, how did you make that covering zone on google maps?
[20:58] <Upu> someone posted a link to a site on the mailing list that does nearby peaks
[20:59] <OZ1SKY_Brian> ok so its not a covering zone based on freq and landscape?
[20:59] <Upu> no
[20:59] <OZ1SKY_Brian> like a coverage map
[20:59] <OZ1SKY_Brian> ok
[20:59] <Upu> LoS @ the level you're at
[20:59] <Lunar_Lander> hi Upu, OZ1SKY_Brian
[20:59] <Upu> http://www.heywhatsthat.com/
[20:59] <Upu> then import into Google
[20:59] <OZ1SKY_Brian> hi lunar
[20:59] <OZ1SKY_Brian> thanks
[21:00] <OZ1SKY_Brian> Lunar_Lander where are you i D ?
[21:00] <Lunar_Lander> Osnabruck
[21:01] <OZ1SKY_Brian> ok dont even need a map for that :-)
[21:01] <Lunar_Lander> :)
[21:01] <OZ1SKY_Brian> went pass that ALOT of times :-)
[21:01] <OZ1SKY_Brian> 4 times in january, hi
[21:02] <Lunar_Lander> cool!
[21:03] <OZ1SKY_Brian> wait im wrong, sorry, i was thinking it was on the A7, but its not lol
[21:03] <Lunar_Lander> xD, A1 it is
[21:03] <OZ1SKY_Brian> yes, so not ALOT of time, but at times :-)
[21:03] <Lunar_Lander> :)
[21:06] <OZ1SKY_Brian> talked to alot of hams in that area
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[21:09] Nick change: _woyna -> woyna
[21:10] <Lunar_Lander> cool OZ1SKY_Brian :)
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[21:19] <OZ1SKY_Brian> just 470km, so not that long path
[21:19] <Lunar_Lander> yeah
[21:19] <Lunar_Lander> never was in DK though
[21:19] <Lunar_Lander> most northerly was Neumuenster
[21:19] <Lunar_Lander> maybe you know that too
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[21:20] <OZ1SKY_Brian> yes thats right next to A7, so passed that countless time
[21:20] <Lunar_Lander> yea
[21:20] <Lunar_Lander> most westerly was Arnhem in NL
[21:21] <Lunar_Lander> most southerly was Lake Constance
[21:21] <Lunar_Lander> and most easterly was Prague
[21:21] <Lunar_Lander> so far :)
[21:21] <Lunar_Lander> in my life
[21:21] <OZ1SKY_Brian> plenty of time to travel
[21:21] <Lunar_Lander> yea
[21:21] <Lunar_Lander> arnhemn and Prague was with the School
[21:21] <Lunar_Lander> Lake Constance was on my own
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[21:22] <OZ1SKY_Brian> i hear ISS have its packet on now
[21:22] <OZ1SKY_Brian> passing over northern france now
[21:23] <OZ1SKY_Brian> hmm stoped now, wonder why
[21:23] <Lunar_Lander> hm
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[21:23] <OZ1SKY_Brian> ok back on
[21:24] <Lunar_Lander> yea
[21:24] <Lunar_Lander> btw OZ1SKY_Brian what did you think of my idea of starting an scandinavian balloon projet
[21:24] <Lunar_Lander> project
[21:25] <OZ1SKY_Brian> a scandinavian ?
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[21:26] <Lunar_Lander> yeah or a Danish
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[21:26] <Lunar_Lander> I think I asked that some days ago
[21:27] <OZ1SKY_Brian> well the only place i know in denmark they launch ballons are that the metor office near copenhagen. im not aware of any ballon hobbyist here and i have no experience myself :-)
[21:27] <Lunar_Lander> yeah
[21:27] <Lunar_Lander> can you find out if HAB is OK in denmark?
[21:28] <Lunar_Lander> and I said scandinavian because we have someone from Finland here too:)
[21:28] <OZ1SKY_Brian> i bacame aware of ukhas at the apex launch, so im pretty wet behind the ears:-)
[21:28] <Lunar_Lander> yeah :)
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[21:29] <OZ1SKY_Brian> Lunar_Lander i will try to do some search if there are any ballon folks here in DK.
[21:29] <Lunar_Lander> cool
[21:29] <Lunar_Lander> thanks :)
[21:33] <MLow-werk> he yall
[21:33] <MLow-werk> hey*
[21:33] <MLow-werk> DK?
[21:33] <Lunar_Lander> hey MLow-werk
[21:33] <Lunar_Lander> denmark
[21:33] <MLow-werk> Cool
[21:33] <MLow-werk> small country or?
[21:33] <Lunar_Lander> yea
[21:33] <Lunar_Lander> yeah
[21:33] <MLow-werk> First im hearing of i
[21:33] <MLow-werk> t
[21:33] <Lunar_Lander> btw OZ1SKY_Brian did you know that the first amateur HAB was done in Finland in 1967?
[21:34] Nick change: MLow-werk -> MLow
[21:35] <OZ1SKY_Brian> no i didnt know that
[21:35] <OZ1SKY_Brian> MLow, hi, where are you at?
[21:35] <MLow> Texas
[21:36] <OZ1SKY_Brian> ok then you probably only heard of a danish :-)
[21:36] <MLow> not really
[21:37] <MLow> You get back from the army pretty brainwashed
[21:37] <OZ1SKY_Brian> http://en.wikipedia.org/wiki/Danish_%28pastry%29
[21:37] <OZ1SKY_Brian> :-)
[21:37] <Lunar_Lander> :P
[21:39] <OZ1SKY_Brian> anyway its on top of germany
[21:39] <Lunar_Lander> xD!
[21:40] <OZ1SKY_Brian> whats that lunar?
[21:40] <Lunar_Lander> do you know "South Park"?
[21:41] <OZ1SKY_Brian> yes
[21:41] <Lunar_Lander> when they laugh, their eyes look like X
[21:41] <Lunar_Lander> and that is from there, xD is like :D
[21:41] <OZ1SKY_Brian> ahh ok :-)
[21:41] <Lunar_Lander> the best thing is
[21:42] <Lunar_Lander> on PCs with a card reader, there is one port for "SM/XD"
[21:42] <Lunar_Lander> always makes me laugh xD
[21:43] <OZ1SKY_Brian> hehe
[21:43] <Lunar_Lander> there is also CF
[21:43] <Lunar_Lander> back in 2004 and 2005 a german HAB team used CF for their onboard memory
[21:43] <OZ1SKY_Brian> MLow are you involved on ballon launches or monitor them?
[21:43] <Lunar_Lander> but today they use SD
[21:44] <OZ1SKY_Brian> only heard a german ballon once. ive heard the dutch ballon hunt a few times
[21:45] <MLow> OZ1SKY_Brian: want to launch, just follow now
[21:45] <MLow> well hang out in irc mostly
[21:45] Nick change: MLow -> MLow-bbl
[21:48] <Laurenceb_> SpeedEvil: on the larger/bga stm32f4 where you can access VDD_Core, itd be possible to use an smps to supply the 1.2v, that way gps current draw goes way down
[21:48] <Laurenceb_> i was also pondering overvoltaging the core and overclocking...
[21:48] <SpeedEvil> Yeah
[21:48] <SpeedEvil> I looked at that a while back on another case
[21:49] <SpeedEvil> SMPS to supply 1.2V helps.
[21:49] <SpeedEvil> Also - perhaps undervolt for underclock
[21:50] <Laurenceb_> yeah - tho level shifters to io might break
[21:51] <SpeedEvil> Indeed.
[21:51] <Laurenceb_> raspberry pi has similar setup
[21:51] <Laurenceb_> but LDO for VDD_Core :(
[21:52] <SpeedEvil> I want a proper datasheet!
[21:52] <SpeedEvil> Oh - and 'kits' and schematics.
[21:53] <Laurenceb_> the datasheet is relativly usable
[21:54] <Laurenceb_> but arm11 sucks somewhat
[21:54] <Laurenceb_> i really like thumb2 now :P
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[22:00] <SpeedEvil> The datasheet is interesting, but limited.
[22:00] <SpeedEvil> For example - powerdown modes, ...
[22:00] <SpeedEvil> The omap3460 datasheet is 3400 pages...
[22:07] <dehuman> haha
[22:07] <Lunar_Lander> ohhh
[22:07] <Lunar_Lander> I thought Atmel's data"books" are big
[22:07] <dehuman> whats this raspberry pi think i've been hearing about
[22:07] <dehuman> is it some type of arduino-like clone ( i hate to phrase it that way but you knwo how it goes)
[22:08] <SpeedEvil> It's basically a teeny PII/300 class laptop on a credit card
[22:08] <Lunar_Lander> yea
[22:08] <SpeedEvil> With HDMI out
[22:08] <jcoxon> dehuman, more like an embedded system that is good enough to be a simple computer
[22:08] <Elwell> http://www.raspberrypi.org/
[22:08] <SpeedEvil> For $25/35
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[22:09] <Laurenceb_> its fusion power
[22:09] <Laurenceb_> on a pcb
[22:09] <Laurenceb_> thats why its never going to actually ship
[22:09] <dehuman> holy shit
[22:09] <Lunar_Lander> lol yea
[22:09] <dehuman> oh wait wait i read about that
[22:09] <dehuman> yah
[22:10] <dehuman> its like vaporware or something?
[22:10] <dehuman> opensourced cheap thing are they making them?
[22:10] <dehuman> its for educational stuff right
[22:10] <dehuman> 17:08 < Elwell> http://www.raspberrypi.org/
[22:10] <dehuman> damnit
[22:10] <Elwell> hell DN forever eventually shipped, (even if crap) so who knows :-)
[22:10] <Lunar_Lander> dehuman: are you at the US East Coast?
[22:11] <dehuman> We have a good idea that it will be sort of in Q3 this year, but we can.t be certain. There are a lot of variables in terms of what we need to get ready. We don.t know completely but we.re moving very quickly..
[22:11] <dehuman> is ohio east coast?
[22:12] <dehuman> lulz
[22:12] <dehuman> so its a gnu arm board with linux or something on it?
[22:12] <Lunar_Lander> dehuman: well, EST I meant
[22:12] <Lunar_Lander> because your citation said 1708 ;)
[22:12] <dehuman> yah Eastern Standard Tribe
[22:13] <dehuman> yah i read about the pi and was really excited then i realized everyone else is too and it'll be a while if ever if i can get my hands on one
[22:13] <Lunar_Lander> yea
[22:13] <jcoxon> will be like the funcube
[22:13] <jcoxon> lots of disappointed people for quite a while
[22:14] <Elwell> reminds me - must try newer firmware in my fcd
[22:14] <SpeedEvil> Lots of people will be dissapointed.
[22:14] <jcoxon> never really used mine properly
[22:14] <SpeedEvil> Yes, it can play 1080p video over HDMI
[22:15] <SpeedEvil> But it is as fast as an over ten year old laptop otherwise.
[22:16] <Elwell> Well, I'm hoping it'll serve as a modern slug equivalent
[22:17] <jcoxon> Elwell, yes
[22:17] <SpeedEvil> It's ideal for that sort of thing.
[22:17] <jcoxon> good for remote listening stations for HAB
[22:17] <SpeedEvil> The only minor wrinkle is its moderately high consumption.
[22:17] <SpeedEvil> As in over a watt idle.
[22:17] <Elwell> wonder if it'll have enough drive for fl-digi
[22:18] <SpeedEvil> Oh -easily.
[22:18] <jcoxon> mid need some optimisation
[22:18] <SpeedEvil> I've run fldigi on my arm-600MHz phone
[22:18] <SpeedEvil> worked fine
[22:18] <Laurenceb_> rip out the 1.2v reg
[22:18] <SpeedEvil> Rip out?
[22:18] <Laurenceb_> and swap for a smitching supply for the core
[22:19] <SpeedEvil> Circuit bending!
[22:19] <Laurenceb_> *switching
[22:19] <SpeedEvil> Just wire input to out
[22:19] <Laurenceb_> lol
[22:19] <SpeedEvil> 3.3V Vcore should make it plenty fast.
[22:19] <Laurenceb_> also a switching supply off 5v could be used
[22:19] <Laurenceb_> i think its all linear atm
[22:19] <SpeedEvil> yeah
[22:20] <SpeedEvil> Some actual specs would be nice.
[22:20] <Laurenceb_> you could probably ~halve the power draw
[22:20] <SpeedEvil> I'd expect to go from 2.5W to 1.8W at worst case with SMPS
[22:20] <SpeedEvil> possibly more like 1.5
[22:21] <SpeedEvil> Then there is the issue of what would be possible with splitting power rails.
[22:21] <SpeedEvil> But hat's unlikely to be possible
[22:21] <Laurenceb_> hmm
[22:21] <Laurenceb_> if it really does launch
[22:21] <SpeedEvil> Say if the composite out has a seperate vdd pin.
[22:21] <Laurenceb_> you could go into business making solder on modules
[22:21] <Laurenceb_> for impoved power
[22:21] <SpeedEvil> Perhaps
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[22:22] <Elwell> (shout if this is OT) -- should I be able to tweak fldigi to decode telemetry - thinking of things like swisscube which use naff little windows programs for doing so
[22:22] <Laurenceb_> vertically mounting pcb that solders onto ldo footprint
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[22:22] <SpeedEvil> hmm
[22:23] <jcoxon> Elwell, possiblely
[22:23] <SpeedEvil> Elwell: fldigi will decode a wide variety of stuff. But only ~8khz bandwidth
[22:23] <SpeedEvil> Or was it 4
[22:23] <fsphil-laptop> 4khz
[22:23] <Laurenceb_> 4
[22:23] <SpeedEvil> Laurenceb: Did you ever get it wider, or did it get horribly complex?
[22:23] <fsphil-laptop> annoyingly
[22:23] <Laurenceb_> too complex
[22:24] <Laurenceb_> i used libsamplerate to make the sdr play nicely
[22:24] <SpeedEvil> ah
[22:24] <jcoxon> Elwell, really depends on the format
[22:24] <fsphil-laptop> there doesn't seem to be a simple way to change the sample rate it works at
[22:24] <fsphil-laptop> it changes depending on the mode
[22:25] <jcoxon> packet is in the new fldigi
[22:25] <jcoxon> so that'll come in useful
[22:26] <jcoxon> can't vouch for how sensitive it is at decoding!
[22:26] <fsphil-laptop> yea - works pretty good too
[22:26] <Elwell> what, full ax25?
[22:26] <fsphil-laptop> not as sensitive as soundmodem, but not far from it
[22:27] <fsphil-laptop> not sure how far the support goes- it seems geared to simple messages
[22:27] <fsphil-laptop> but it can decode aprs position packets
[22:27] <Elwell> OK I should download and play
[22:28] <fsphil-laptop> it's a heck of a lot handier than having to setup an igate, if we ever decide to try ax25 for a payload
[22:28] <jcoxon> we need to finishng updating dl-fldigi
[22:28] <Elwell> sadly I don't have decent antenna here for FCD and I've broken my 2.5mm jack cable for handheld. typical.
[22:28] <fsphil-laptop> indeed -- I believe there where problems compiling on mac and windows
[22:29] <fsphil-laptop> although the mac issues may be fixed in that last merge with upstream
[22:30] <jcoxon> bbl
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[22:56] <fsphil-laptop> the police helicopter is circling the town. lovely
[23:01] <fsphil-laptop> totally ot, 12 byte demo on the zx spectrum: http://www.youtube.com/watch?v=vBTlHTfCIt0
[23:02] <fsphil-laptop> like an evil alarm clock
[23:03] <Upu> now showing my age here but
[23:03] <Upu> poke 53280,0 poke 53281,1
[23:03] <Upu> bonus points to anyone who can tell me what that did
[23:04] <fsphil-laptop> black border, white screen :p
[23:04] <SpeedEvil> umm - screen b orders?
[23:04] Action: fsphil-laptop gets his coat
[23:04] <Upu> hah
[23:04] <Upu> didn't think you were old enough :)
[23:04] <SpeedEvil> That was a wild guess.
[23:04] <fsphil-laptop> well syntax error
[23:04] <SpeedEvil> E
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[23:29] <Laurenceb_> heywhatsthat.com is tempting me to make a free space laser link
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[23:29] <MLow-bbl> damn flat tire
[23:29] Nick change: MLow-bbl -> MLow-werk
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[23:33] <SpeedEvil> Couple of servos, one of the galvo packs from ebay, 3 axis mag/gyro, GPS, and you're almost there.
[23:34] <MLow-werk> i get about to leave for work, late already, start the car and head down the block only to notice the tire pressure light
[23:34] <MLow-werk> raining, ofcourse
[23:35] <MLow-werk> i change out for the donut, and figure it safer to ride in my old car since it's raining
[23:35] <MLow-werk> start the old 94' camry, only to hear is idle real bad
[23:35] <MLow-werk> pop the hood and theres a spark plug cap sticking 6in out the head
[23:36] <MLow-werk> i shove that thing back in there with all my might and start it up again to watch it then slowly wiggle it's way right back out
[23:36] <fsphil-laptop> weird
[23:36] <MLow-werk> so back into the kia and off i went 50mph to work lol
[23:36] <MLow-werk> since the donut is only rated for that im 40 minutes late
[23:37] <fsphil-laptop> my handbrake got stuck last week
[23:37] <MLow-werk> never heard of that happening
[23:37] <fsphil-laptop> I'm new to cars, and learning that they're a lot of hassle
[23:37] <Laurenceb_> whats a donut?
[23:37] <MLow-werk> a "compact spare tire"
[23:37] <Laurenceb_> oh of course
[23:37] <MLow-werk> usually really small, high pressure and low on rubber
[23:38] <MLow-werk> not really a spare tire at all, a donut
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[23:41] <gonzo_> spark plug not screwed in well, letting gas push t out again?
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[23:51] <MLow-werk> not screw
[23:51] <MLow-werk> just snaps
[23:51] <MLow-werk> probably all bent or something
[23:52] <MLow-werk> literally gave it 30 seconds of my time i was late as is
[23:55] <gonzo_> thinking of the spark blug itself, so leaking gasses from the cylinder to push the cap out
[23:55] <gonzo_> just a thought for when you get back to it
[23:56] <MLow-werk> yeah it's an old car, figure it's probably best to donate it
[23:56] <MLow-werk> to someone for whome it's worth trying to fix
[23:58] <Lunar_Lander> OZ1SKY_Brian: still here?
[00:00] --- Sun Feb 19 2012