highaltitude.log.20101025

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[00:20] <Dan-K2VOL> hola
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[07:00] <jcoxon> morning
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[07:14] Action: jcoxon has the week off woohooo
[07:16] <jonsowman> :D
[07:16] <jonsowman> nice
[07:16] <jonsowman> lucky you, wish I did
[07:17] <jcoxon> but then i'm on call all the week after which will not be fun at all
[07:18] <jonsowman> :(
[07:18] <defy> jcoxon :)
[07:18] <jcoxon> oh well - i can push on with this payload
[07:19] <jcoxon> hey defy
[07:19] <jonsowman> which payload is this?
[07:19] <jcoxon> well its my new atlas flight computer
[07:19] <jcoxon> need to finish the code
[07:19] <jonsowman> cool
[07:19] <jonsowman> :)
[07:20] <jcoxon> planning to fly a test floater in a few weekends time
[07:20] <jcoxon> if the cambridge guys are up for an overnight flight
[07:20] <defy> im finally putting together a glider drop jcoxon, uavs will be legal in nz soon so my boss is funding a project
[07:20] <jonsowman> hehe I'd be up for that, depending what day
[07:21] <jcoxon> jonsowman, how about sat 6 nov?
[07:21] <jcoxon> though might be fireworks night
[07:22] <jcoxon> would just need to launch it at around 5 oclock
[07:22] <jcoxon> then let it float
[07:22] <jonsowman> sounds fine to me, would definitely be up for it
[07:22] <jonsowman> Randomskk: ^^
[07:22] <jcoxon> defy, sweet
[07:22] <jcoxon> we should all be coming to NZ then
[07:22] <jonsowman> our NOTAM runs out on 7th nov
[07:23] <jonsowman> in process of renewing at the moment though you know how it is - might be a few days without one
[07:23] <jonsowman> but 6th will be okay
[07:23] <jcoxon> eek :-p
[07:23] <jonsowman> mm
[07:23] <jcoxon> it'll still be flying on the 7th
[07:24] <jcoxon> well we can wait and see
[07:24] <jonsowman> the NOTAM only needs to cover the launch I think
[07:24] <jcoxon> well i'll pencil in that day
[07:25] <jonsowman> okay, shall I email the cusf list and see who's around?
[07:25] <jcoxon> yeah that would be good
[07:25] <jonsowman> ok will do
[07:25] <jcoxon> we'll go for a floater
[07:25] <jcoxon> i'm not too fussed about losing this one
[07:25] <jcoxon> if its a terrible flight path might swap out the ublox gps for a lassen
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[07:28] <jonsowman> ok email sent, will keep you up to date with replies
[07:28] <jcoxon> thanks
[07:29] <jcoxon> how cambridge treating you these days?
[07:29] <jonsowman> yeah good, am still enjoying it though have a *lot* of work at the moment
[07:29] Action: jcoxon will be returning in the spring for his MA
[07:29] <jonsowman> excellent, might see you around then?
[07:29] <jcoxon> hehe maybe
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[07:31] <m1x10> Morning
[07:31] <jcoxon> morning m1x10
[07:36] <defy> anyone here used the arduino for anything? or ardupilot?
[07:36] <defy> an*
[07:36] <jcoxon> i've used an arduino
[07:36] <defy> quite simple to use?
[07:37] <jcoxon> yes very
[07:37] <jcoxon> though people can get a little frustrated and then switch to using plain AVR C
[07:37] <defy> I've ordered an ardupilot mega, should be here this week...got a bit sick of the limits of the gumstix platforms
[07:38] <defy> hrm true, i've got a bit of avr c experience from the robostix so i guess thats a bonus
[07:38] <jcoxon> yeah
[07:38] <jcoxon> for what we do hte gumstix isn't that great
[07:38] <jcoxon> appart from for sstv :-P
[07:38] <jcoxon> still have a gumstix payload - flown before - ready to be called upon again :-)
[07:39] <defy> sweet, arduino just seem to answer all the little annoyances the gumstix had
[07:39] <defy> hopefully
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[08:36] <earthshine> morning
[08:36] <jcoxon> hey earthshine
[08:36] <earthshine> Hi James - how's u ?
[08:37] <jcoxon> not bad thanks
[08:37] <jcoxon> you?
[08:37] <earthshine> Yeah pretty good - glad my book is finally complete - now I can pick up where I left off a year ago and start my HAB project again
[08:37] <jcoxon> hehe, excellent
[08:38] <jcoxon> i'm just programming my new flight computer
[08:38] <earthshine> nice
[08:38] <earthshine> Still Arduino based?
[08:39] <jcoxon> yup
[08:39] <jcoxon> http://www.flickr.com/photos/jcoxon77/5087020098/in/set-72157625156630612/
[08:39] <jcoxon> though it now has a radiometrix ntx2 module onboard as well
[08:39] <jcoxon> in the gap
[08:40] <earthshine> looks good
[08:40] <jcoxon> a lot of design improvements on the last one
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[08:41] <earthshine> got any of those boards for sale?
[08:41] <jcoxon> i've got 9 spare currently
[08:41] <jcoxon> and 8 falcom gps breakout boards
[08:44] <jcoxon> interested in one?
[08:44] <earthshine> sure - would speed things up
[08:45] <jcoxon> do you have an ntx2 radio module?
[08:46] <earthshine> sure do
[08:46] <jcoxon> okay cool
[08:46] <jcoxon> yeah i could stick one in the post to you today actually
[08:46] <jcoxon> going there anyway
[08:46] <earthshine> Cool
[08:46] <earthshine> Let me know how much you want for it
[08:47] <earthshine> i think i still have your paypal details
[08:47] <jcoxon> i'll have to work it out
[08:47] <jcoxon> one sec
[08:48] <earthshine> np - add a few squid on for your time
[08:48] <jcoxon> haha well considering it cost me 20 dollars for 10 boards...
[08:49] <jcoxon> how about a fiver
[08:50] <earthshine> sounds very reasonable
[08:51] <jcoxon> could always order more anyway
[08:51] <jcoxon> do you need a falcom breakout board?
[08:51] <earthshine> yeah - i could sell them as a kit in the store ;)
[08:51] <jcoxon> just to say - that when the falcom ublox gpses work they are awesome
[08:51] <earthshine> No i've got a few of those thanks
[08:52] <earthshine> Would like to get a lauch up in either Dec or Jan if possible
[08:52] <jcoxon> good plan
[08:53] <earthshine> with 2 cameras
[08:53] <jcoxon> your address still Orpington?
[08:53] <earthshine> home address yeah
[08:53] <jcoxon> great
[08:53] <jcoxon> got it still
[08:53] <jcoxon> my paypal is my email address
[08:53] <earthshine> cool
[08:54] <earthshine> will sort that out later when i have access to my desktop
[08:54] <jcoxon> np
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[09:25] <defy> what anntennas / range do you get with that jcoxon?
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[09:33] <jcoxon> defy, ummm the current record is 555km
[09:34] <jcoxon> using a 1/4 wave ground plane on the balloon and a vertical on the ground
[09:34] <jcoxon> though a yagi might be able to push it a bit more
[09:34] <jcoxon> earthshine, any good with arduino errors?
[09:34] <earthshine> Depends why?
[09:35] <defy> 555KM? jeez
[09:35] <jcoxon> playing with the SimpleTimer library
[09:35] <jcoxon> but it won't compile
[09:35] <jcoxon> SimpleTimer.h:33: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'SimpleTimer'
[09:35] <defy> jcoxon is that your record?
[09:35] <jcoxon> that was by fsphill and the ALIEN-1 launch from Cambridge
[09:35] <defy> oh right...yea...thats pretty darn good, feeding telemetry?
[09:36] <jcoxon> 50 baud rtty
[09:36] <jcoxon> on 434.075mhz 10mW tx power
[09:37] <defy> 1.8million feet?im guessing that wasn't straight up
[09:37] <jcoxon> hehe no it'll be at 30km altitude
[09:37] <jcoxon> 555km on the ground
[09:37] <defy> nice
[09:37] <jcoxon> needs a good receiver
[09:38] <defy> the ground receiver antenna, how were you mounting it? did it need to be aligned quite precisely?
[09:38] <jcoxon> it was a vertical so not really
[09:38] <defy> ah right
[09:38] <jcoxon> a yagi does but its pretty easy to do
[09:40] <defy> i guess the low baud rate helps
[09:40] <jcoxon> yeah
[09:40] <jcoxon> but people have found 300baud to also be good
[09:40] <defy> im yet to really push my xtend modules, but im pretty keen to trial some others
[09:42] <jcoxon> :-)
[09:42] <jcoxon> our setup with the ntx2 modules and then using dl-fldigi to upload the data works really well
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[09:49] <DanielRichman> jcoxon: you're missing a semi colon on one of your prototypes in a header
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[09:55] <jcoxon> DanielRichman, hmmm can't seem to find it!
[09:55] <jcoxon> http://www.arduino.cc/playground/Code/SimpleTimer#GetTheCode
[09:58] <DanielRichman> and where are you including simpletimer.h from?
[09:59] <jcoxon> in my code?
[09:59] <jcoxon> or the library?
[10:00] <DanielRichman> You have #include <SimpleTimer.h> in your code ?
[10:00] <jcoxon> yes
[10:00] <DanielRichman> can you pastebin that file?
[10:01] <jcoxon> http://pastebin.com/Ww3fh1Y6
[10:02] <jcoxon> i tried with the example as well but the same error
[10:02] <DanielRichman> when you compile, does it say "in file incldude from" before the error?
[10:02] <jcoxon> yes
[10:02] <DanielRichman> which file is it?
[10:02] <jcoxon> Arduino/libraries/SimpleTimer/SimpleTimer.c:26:
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[10:02] <Laurenceb_> hi
[10:05] <DanielRichman> jcoxon: I forget; is WProgram.h generated by the IDE or provided by the Arduino guys?
[10:08] <DanielRichman> jcoxon: http://pastie.org/1246929
[10:10] <jcoxon> one sec - on phone
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[10:17] <jcoxon> bingo
[10:17] <jcoxon> oooo i might have named it SimpleTimer.c not SimpleTimer.cpp
[10:18] <jcoxon> thanks DanielRichman
[10:18] <DanielRichman> :P I didn't actually fix that, but ok :)
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[11:39] Action: Laurenceb_ rages at libsamplerate
[11:39] <DanielRichman> raaarr!
[11:40] <Laurenceb_> scipy installation script isnt finding it
[11:45] Action: Laurenceb_ facepalms
[11:46] <Laurenceb_> so many compiler errors its hung my machine
[11:48] <Laurenceb_> think im going to give up on attempting to make this work - the developer does say hes only tested on windows :S
[11:48] <Laurenceb_> fatser to code it myself from scratch
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[12:30] <Darkside> whoever designed this scanner was a freaking headcase
[12:40] <shenki> Darkside: what scanner?
[12:41] <Darkside> the one i got from my dad
[12:42] <Darkside> it has 3 boards in it, layered on top of each otehr with connectors
[12:42] <Darkside> i'm trying to trace the power lines from the battery
[12:43] <Darkside> on the plus side i've just confirmed i can run the scanner from a lipo connected to the external power source port
[12:43] <Darkside> :)
[12:43] <Darkside> so i think i'm goint to mount a lipo pack inside this thing somehow
[12:44] <Darkside> hahahahahaha
[12:44] <Darkside> oh man
[12:44] <Darkside> it doesnt like that
[12:45] <eroomde> yo jcoxon
[12:45] <Darkside> i think i'd better use an 11.1v pack, not a 7.4 one..
[12:45] <DanielRichman> why do you need a portable scanner?
[12:45] <jcoxon> hi eroomde
[12:45] <Darkside> DanielRichman: this is the only scanner I have that does USB on UHF :)
[12:45] <eroomde> you want to try and fly something this w/e?
[12:45] <Darkside> and i want to be able to take it with me
[12:45] <DanielRichman> oh, almost thought you meant a flatbed scanner
[12:45] <jcoxon> eroomde, i sadly can't
[12:45] <Darkside> nah
[12:45] <Darkside> its a Yupitery MVT-7100
[12:45] <DanielRichman> and were off to do some industrial espionage
[12:45] <jcoxon> am going to bristol with gf
[12:45] <Darkside> Yupiteru
[12:46] <eroomde> jcoxon: h'ok
[12:46] <Darkside> problem is it doesnt want to run off batteries anymore
[12:46] <Darkside> but it works using the DC jack
[12:46] <eroomde> jcoxon: do you want to retreive this'n?
[12:46] <jcoxon> eroomde, am keen to launch soon though...
[12:46] <Darkside> so i'm going to wire a LiPo into the DC jack
[12:46] <jcoxon> eroomde, if possible...
[12:46] <eroomde> cool
[12:46] <jcoxon> but you know how it is
[12:46] <eroomde> might you object to sharing a ride with the squirrel?
[12:46] <jonsowman> hi all
[12:46] <eroomde> if it looks like a safe flight
[12:47] <jcoxon> was thinking a floater...
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[12:48] <Darkside> hmm the problem i'm going to have here is where the hell i'm going to mount the battery pack
[12:53] <eroomde> just remember Darkside that it needs to be solid wherever it is! Batteries are really good at popping out on landing
[12:53] <Darkside> uhh
[12:53] <Darkside> this isnt for a balloon launch
[12:53] <Darkside> this is my telemetry receiver :D
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[12:54] <eroomde> oh :)
[12:54] <eroomde> sorry my bad
[12:55] <jcoxon> whats a sensible way of making a payload transmit every 30 seconds
[12:55] <Darkside> jcoxon: _delay_ms(30000)
[12:55] <jcoxon> on 00 seconds and 30 seconds
[12:55] <Darkside> oh
[12:55] <Darkside> gps locked timer?
[12:55] <jonsowman> must it be on 0 and 30?
[12:55] <Darkside> use the GPS PPM as an interrupt source to lock a counter?
[12:56] <jcoxon> jonsowman, ideally i reckon
[12:56] <Darkside> jcoxon: GPS to set the timer
[12:56] <jcoxon> my thinking is that as soon as you move away from continous it would be helpful to have it locked to a time
[12:56] <Darkside> then GPS ppm to increment it
[12:56] <jcoxon> yeah
[12:56] <jcoxon> requires me to do some hardware adjustment
[12:57] <DanielRichman> I thought delay_ms has a max value. 30s sounds very high
[12:57] <Darkside> jcoxon: then just use the data from the UART
[12:57] <Darkside> it might be out by a second, that might be close enough
[12:57] <Randomskk> DanielRichman: like, how many milliseconds you can store in an unsigned int? :P
[12:57] <jcoxon> yeah its not too vital
[12:57] <Darkside> when seconds == 0 || seconds == 30
[12:57] <Randomskk> yea, I'd use GPS time seconds counter
[12:58] <DanielRichman> Randomskk: nah it's not that
[12:59] <jcoxon> Darkside, i'm polling the gps rather than reading the nmea stream - trying to avoid polling it every second really
[13:00] <DanielRichman> The maximal possible delay is 262.14 ms / F_CPU in MHz.
[13:00] <Darkside> ahh ok
[13:00] <jcoxon> so of need a if(millis() >= old_millis)
[13:00] <DanielRichman> When the user request delay which exceed the maximum possible one, _delay_ms() provides a decreased resolution functionality. In this mode _delay_ms() will work with a resolution of 1/10 ms, providing delays up to 6.5535 seconds (independent from CPU frequency). The user will not be informed about decreased resolution.
[13:01] <jcoxon> and then when i got a lock shift this to fit 00 and 30seconds
[13:03] <jcoxon> pah its not that important
[13:04] <fsphil> when you do get the time, just sleep the number of seconds until the next 00 / 30 mark
[13:04] <fsphil> if seconds = 25 then sleep 5 seconds...
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[13:08] <fsphil> s = 30 - (gps_seconds % 30);
[13:08] <fsphil> _delay_ms(s * 1000);
[13:09] <Dan-K2VOL> morning
[13:09] <jcoxon> morning Dan-K2VOL
[13:09] <jcoxon> fsphil, will try that
[13:09] <Darkside> yeah ok screw trying to mount a lipo inside this scanner
[13:09] <Darkside> i'll just velcro one to the side
[13:09] <DanielRichman> Using _delay_ms with non constants isn't to great an idea
[13:09] <Darkside> that'll be safe :)
[13:09] <Darkside> if anything goes wrong i can just rip it off and throw it away
[13:10] <DanielRichman> use the arduino delay func
[13:10] <jcoxon> Dan-K2VOL, hows white star project going?
[13:13] <Dan-K2VOL> jcoxon, pretty good, placing the balloon order next week. We're just waiting on the envelope sensor string parts to arrive. We'll assemble that string and send it to Mark to be integrated into the balloon during construction. Funding is in poor shape, but we're about to try to publicise it a bit to get some donations.
[13:13] <Dan-K2VOL> have ordered PCBs from GoldPhoenix for the flight computer and balloon sensors
[13:14] <jcoxon> nice
[13:14] <Dan-K2VOL> been working extensively on documentation and logistical research - procedures for North Atlantic ATC and such
[13:14] <jcoxon> yeah
[13:16] <Dan-K2VOL> designing the power supply board now, currently the design is to use one 4.5v raw battery pack and have 3.3v, 5v, and 12v outputs using step-up/step-down converters. Will mount the regulators against the batteries to assist in heating
[13:17] <jcoxon> oh i see
[13:17] <Dan-K2VOL> going to try a TMP101 SOT-23 I2C thermostat chip to control the actual battery heater
[13:17] <jcoxon> what would the 12v be for?
[13:17] <Dan-K2VOL> that should allow the flight computer to just set the temp threshold and forget it
[13:17] <jcoxon> as i thought you weren't taking the radio route
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[13:17] <Dan-K2VOL> the Digi m10 requires 9 to 18v
[13:17] <jcoxon> oh i see
[13:18] <Dan-K2VOL> trying to put every sensor, module and board on a master I2C bus
[13:18] <Dan-K2VOL> I'm not so sure we've done enough research into whether that many things will cooperate on one bus tho
[13:18] <jcoxon> hehe
[13:19] <Dan-K2VOL> if not, we're leaving each board with a GPIO line connected to the flight computer
[13:21] <Dan-K2VOL> we're going to try to use HF again after the first flight when we can have the option to drop it as ballast in last ditch scenarios
[13:21] <jcoxon> oh right
[13:21] <russss> heh
[13:22] <Dan-K2VOL> the balloon sensor string is looking like it'll weigh about 200g
[13:24] <jcoxon> the info off that will be very interesting
[13:24] <Dan-K2VOL> going to gather solar heating data, and internal pressures
[13:24] <Dan-K2VOL> yes, highly useful in modeling these little ZP balloons
[13:25] <Dan-K2VOL> we're going to measure negative pressure at the neck too, to see how long after sunset it takes for air to filter in and equalize
[13:25] <jcoxon> well if you want a dl-fldigi/spacenear.us compatible backup system just shout
[13:26] <jcoxon> i've made good progress with mine
[13:28] <Dan-K2VOL> excellent, we certainly will when we get HF on there
[13:28] <Dan-K2VOL> do you guys ever take out liability insurance for flights?
[13:29] <jcoxon> oh 70cm currently not HF
[13:29] <jcoxon> Dan-K2VOL, rarely
[13:29] <jcoxon> the big groups have but on a private level its not really economical
[13:30] <Dan-K2VOL> what big groups?
[13:30] <jcoxon> CU Spaceflight
[13:30] <jcoxon> actually in the UK thats the only big group
[13:30] <jcoxon> also i think the BBC flights had insurance
[13:31] <Dan-K2VOL> I wonder who they got it through, we're looking at it, and having a lot of trouble finding anything near affordable
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[13:31] <jcoxon> ping eroomde jonsowman Randomskk
[13:31] <jonsowman> hi jcoxon
[13:32] <jonsowman> whats up
[13:32] <Dan-K2VOL> insurance we've found so far is 5345 EUR per year
[13:32] <jcoxon> what did you guys do regarding insurance?
[13:32] <jonsowman> I've no idea actually
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[13:50] <Randomskk> we have some
[13:50] <Randomskk> it covers us for $lots if bad things happens
[13:58] <Dan-K2VOL> randomskk, do you know how much it cost/who it's through?
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[14:06] <Laurenceb_> whats the difference between fopen and open in c ?
[14:10] <Randomskk> Dan-K2VOL: I can't seem to find the details.
[14:10] <Dan-K2VOL> thank you for looking though :-)
[14:11] <jonsowman> Randomskk: I looked too
[14:12] <Randomskk> nothing on the wiki but I'm pretty sure it's been mentioned before
[14:12] <Randomskk> as existing
[14:12] <jonsowman> having the insurance docs on the wiki would be handy
[14:12] <jonsowman> also the risk assessment contact details need updating
[14:12] <jonsowman> I wonder if the original non-PDF document is around
[14:12] <Randomskk> we have a risk assessment?
[14:13] <jonsowman> heh
[14:13] <jonsowman> yes
[14:13] <jonsowman> from 2008
[14:13] <russss> I guess it would be cool if UKHAS had insurance
[14:13] <russss> for people to use
[14:13] <fsphil> Laurenceb, I believe open() is a bit lower level than fopen
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[14:21] <eroomde> Randomskk Dan-K2VOL you're discussing cusf insurance?
[14:21] <Dan-K2VOL> yes
[14:21] <eroomde> I set it up
[14:21] <Dan-K2VOL> we're looking for insurance for the White Star balloon project
[14:22] <Dan-K2VOL> wondering who you guys went with, how much it was?
[14:22] <eroomde> and the number you just mentioned sounds about right to me
[14:22] <Dan-K2VOL> ah
[14:22] <Dan-K2VOL> I assume the school paid for it
[14:22] <eroomde> it's specialist insurnance in a tiny market and most of them just make you pay the premium
[14:22] <eroomde> no
[14:22] <eroomde> they didn't
[14:22] <eroomde> they couldn't find any
[14:23] <eroomde> i spent a week or so trying a few things and groups, eventually went with flacon
[14:23] <eroomde> falcon*
[14:23] <Dan-K2VOL> how did you guys come up with that kind of money?
[14:23] <Dan-K2VOL> we're about to hit Reddit up for donations, for lack of personal funding
[14:24] <eroomde> I think Randomskk might have suggested the insurance was for general activities but that's not the case
[14:24] <DanielRichman> Laurenceb_: open is almost a syscall. It opens a file, giving you a fd (integer), which you can use the unbuffered direct syscalls read() and write() on, flags depending
[14:24] <eroomde> we got it for something specific and we were able to get the cost covered for that specific thing
[14:24] <Dan-K2VOL> something specific being a particular flight?
[14:24] <DanielRichman> Laurenceb_: fopen is the libc buffered IO thing. It opens a file, and internall calls open(), but gives you a FILE* struct, with buffering and you can use the funky fgetc, fputs, fprintf, etc. functions on it
[14:25] <Dan-K2VOL> or a particular type of catastrophe
[14:25] <eroomde> it covered 3 flights
[14:25] <Dan-K2VOL> gotcha
[14:25] <Dan-K2VOL> thank you eroomde, that helps to know
[14:26] <eroomde> i can give you the name of our contact at falcon but as i say, i doubt you'll get a much lower offer
[14:26] <Laurenceb_> i see
[14:27] <eroomde> it's just not worth the while of most firms to even do research and make a quote
[14:28] <earthshine> afternoon
[14:32] <Dan-K2VOL> that's ok, we'll give them a ring, thanks eroomde
[14:51] <eroomde> no probs Dan-K2VOL
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[14:52] <eroomde> i'm happy to discuss the specifics of what we asked for more on email or skype (eddymoore at gmail.com) and indeed privately with anyone else on the channel, just not publically logged as some of it is to do with someone we did some work for who wanted the usual business confidentiality
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[15:50] <griffonbot> @nearsys: Followed the NSTAR mission from a new netbook and Verizon card. Worked great, it's now a part of my tracking system. #ARHAB [http://twitter.com/nearsys/status/28703148416]
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[15:58] <Dan-K2VOL> ping eroomde
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[16:47] <fsphil> anyone any ideas what might be causing this dl-fldigi crash: http://pastebin.com/Cc0JuQrj
[16:47] <fsphil> it happens after about 30 minutes of running
[16:48] <DanielRichman> memory leak?
[16:49] <fsphil> that's what I've been thinking but I can't find one
[16:49] <fsphil> and valgrind is too slow to run it live
[16:58] <DanielRichman> well is all the memory on your system being consumed?
[16:59] <DanielRichman> isn't there some tool that will show you
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[17:10] <fsphil> top doesn't show anything obvious
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[17:19] <DanielRichman> free -m ?
[17:32] <Dan-K2VOL> http://www.reddit.com/r/science/comments/dw5s7/exploration_of_the_jet_stream_by_amateur/
[17:45] <fsphil> I got it running under valgrind with a capture rather than live
[17:45] <fsphil> isn't showing any more than normal
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[18:23] <Laurenceb> ah reddit, home of liberal pot smokers
[18:23] <Laurenceb> who are obsessed with music drm
[18:26] <Laurenceb> oh and camwhoring - i find it funny how site like bbc link to somewhere with a camwhoring section
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[18:42] <Lunar_Lander> hello
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[19:21] <m1x10> hi astronaut
[19:23] <Lunar_Lander> thanks :)
[19:23] <Lunar_Lander> how's life?
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[20:01] <HAMTRONIX> greetings all
[20:10] <m1x10> Lunar_Lander its ok. studing to give cisco ccna exams
[20:10] <m1x10> hi HAMTRONIX
[20:10] <HAMTRONIX> some buddies and I are in the initial stages of a balloon project, found you guys while googling existing projects
[20:11] <HAMTRONIX> the predictor on habhub is slick
[20:13] <HAMTRONIX> we have decided on a few pieces of hardware, GPS rec is garmin 18x lvc, and we are going to use an opentracker for aprs data, basic stamp 2 for flight computer and data logging
[20:13] <m1x10> sounds normal :)
[20:13] <HAMTRONIX> need to decide on a tranceiver yet, not sure how to go on that one, im thinking we only need 1 watt or so, prob less
[20:14] <SpeedEvil> Where are you? HAMTRONIX
[20:14] <HAMTRONIX> our group is all over the USA, im personally in philly, we are going to launch down around hashville TN though
[20:14] <HAMTRONIX> *nashville
[20:15] <HAMTRONIX> we are a bunch of frinds from a game called eve-online, we all decided to do a balloon project after reading about some of the recent ones, all IT guys and what not, so right up our alley
[20:15] <Lunar_Lander> oh sorry m1x10
[20:15] <Lunar_Lander> sounds nice :)
[20:17] <fsphil> hiya HAMTRONIX -- there's a good possibility your GPS receiver won't work above 18km unfortunately
[20:19] <HAMTRONIX> thats interesting phil, I saw some info indicating it was ideal for high alt experiments
[20:19] <HAMTRONIX> im open to any suggestions, if you have one
[20:19] <SpeedEvil> Many units do not work over 60000ft OR 1000knots.
[20:19] <fsphil> it's possible - if others have used them successfully then you should have no problems
[20:19] <SpeedEvil> When the limit should be AND
[20:20] <HAMTRONIX> yeah, I saw how that has been interpreted differently by different manufacturers
[20:21] <SpeedEvil> http://ukhas.org.uk/guides:gps_modules
[20:22] <fsphil> found this: "Before using the GPS 18x at high altitudes (over 60,000') be sure to check that it has the latest firmware installed. Early firmware versions did not function properly at high altitudes."
[20:24] <fsphil> yep, on the garmin download page for version 2.80: "Fixed problem of unit not working above 60,000 feet"
[20:24] <fsphil> http://www8.garmin.com/support/download_details.jsp?id=4055
[20:29] <Lunar_Lander> btw is it right that it was a military restriction?
[20:29] <Lunar_Lander> that it won't work at 18+ km
[20:30] <fsphil> the restriction was both altitude and speed, so it couldn't be used on missiles
[20:30] <Lunar_Lander> ah
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[20:31] <SpeedEvil> It's in the ITAR regulations. Internationl Trade in Arms
[20:31] <SpeedEvil> The next section has restrictions on really high speed cameras useful for developing bombs.
[20:31] <SpeedEvil> atomic ones.
[20:31] <Lunar_Lander> yes
[20:31] <Lunar_Lander> for slow-mo movies right?
[20:32] <SpeedEvil> the previous section has limits on kick motors on satellites that are energetic enough to drop them out of orbit on a target.
[20:32] <Lunar_Lander> yeah
[21:00] <HAMTRONIX> thx for the info guys, see you all on a regular basis wasting time at work! Time to head home now
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[21:15] <earthshine> evenin'
[21:16] <fsphil> hiya earthshine, how's things?
[21:16] <earthshine> Good thanks - you ?
[21:17] <fsphil> not too bad, bit cold ;)
[21:17] <earthshine> got any launches coming up ?
[21:18] <Upu> there are a few floating round if you excuse the pun
[21:18] <earthshine> :D
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[23:12] <jcoxon> evening all
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[00:00] --- Tue Oct 26 2010