highaltitude.log.20090302

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[01:25] <fergusnoble> hallam: hey
[01:25] <SpeedEvil> hey both
[01:26] <Laurenceb> hi guys
[01:26] <Laurenceb> I'm knackered, going to zzz in 5
[01:26] <fergusnoble> hi SpeedEvil, Laurenceb
[01:27] <fergusnoble> Laurenceb: got home ok? hope it was fun
[01:27] <Laurenceb> yeah, got some kebab along the way
[01:27] <fergusnoble> Laurenceb: pm me your email and ill send you some photos
[01:27] <Laurenceb> ah cool
[01:33] <Laurenceb> wow its fast
[01:33] <Laurenceb> quite a bend on those photos
[01:33] <Laurenceb> guess it looks different through a camera, it seemed to go up fairly stright
[01:34] <hallam> hey
[01:34] <hallam> wine+pancakes=bad
[01:34] <hallam> night
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[01:39] <Laurenceb> that could be the sun reflecting
[01:40] <Laurenceb> if you stitch a few frames you should be able to work out hw high that is
[01:41] <Laurenceb> and thus see if the speed is actually supersonic
[01:41] <Laurenceb> be interesting to look at doppler
[01:42] <Laurenceb> anyway I'm off, cya
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[01:42] <SpeedEvil> Night.
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[07:58] <G8KHW_> Hey Fergus
[07:59] <G8KHW_> Did the flight yesterhay break Mach
[07:59] <G8KHW_> ?
[08:02] <natrium42> <edmoore> just broke mach
[08:02] <natrium42> :)
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[10:20] <SpeedEvil> Boom!
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[11:29] <hallam> hey gang
[11:30] <hallam> fergusnoble: do you have the rocket landing site coords? I'm just curious
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[14:15] <Laurenceb> hello
[14:15] <Laurenceb> fergusnoble: I think thats the sun reflecting
[14:16] <Laurenceb> ... off a cloud of swamp gas from venus
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[16:06] <jcoxon> afternoon all
[16:07] <Laurenceb> hi jcoxon
[16:07] <jcoxon> hey Laurenceb
[16:07] <jcoxon> got a quote for the valves - same prive
[16:07] <jcoxon> price*
[16:07] <Laurenceb> ok
[16:07] <jcoxon> they've got 2 in stock so am ordering them now
[16:07] <Laurenceb> neat
[16:07] <Laurenceb> shall we try and use methanol?
[16:08] <jcoxon> what are you thoughts on ballast type?
[16:08] <SpeedEvil> methanol is a bit more aggressive on seals
[16:08] <Laurenceb> hmm yeah
[16:08] <Laurenceb> not sure... the o rings are silicone
[16:08] <SpeedEvil> you'd want to check material compatibility with the valves
[16:08] <Laurenceb> not sure about the body
[16:08] <Laurenceb> yeah
[16:08] <SpeedEvil> silicone can swell _badly_ with some solvents
[16:09] <SpeedEvil> I _think_ methanol is one, but don't really remember.
[16:10] <jcoxon> http://www.efunda.com/DesignStandards/oring/oring_chemical.cfm?SM=none&SC=Methanol#mat
[16:11] <Laurenceb> looks good
[16:12] <jcoxon> http://spacenear.us/gfs/2009-03-02-5.png :-D
[16:12] <SpeedEvil> http://www.efunda.com/DesignStandards/oring/oring_chemical.cfm?SM=none&SC=Whiskey#mat
[16:12] <jcoxon> perfect
[16:12] <jcoxon> whiskey would be great
[16:12] <SpeedEvil> Looking pretty
[16:12] <jcoxon> note the 'e' in whiskey
[16:13] <Laurenceb> hehe
[16:13] <Laurenceb> thats ethanol
[16:13] <Laurenceb> unless its russian
[16:13] <jcoxon> so scottish stuff wouldn't work
[16:13] <jcoxon> only irish and american
[16:13] <SpeedEvil> jcoxon: did you do any spread of launch sites analysis?
[16:13] <Laurenceb> http://imagebin.org/39823
[16:13] <Laurenceb> ^ yesterday
[16:14] <SpeedEvil> The first launch is going to be 'all up' - rather than just a balloon and a 433Mhz squeeker?
[16:14] <SpeedEvil> oh - ballast
[16:14] <SpeedEvil> I suppose you have to
[16:14] <jcoxon> SpeedEvil, its going to be HF radio, flight 'puter and ballast
[16:14] <SpeedEvil> what was altitude?
[16:14] <jcoxon> so it will be fully functioning
[16:14] <SpeedEvil> cameras?
[16:15] <jcoxon> no
[16:15] <Laurenceb> SpeedEvil: 9000 feet
[16:15] <jcoxon> http://spacenear.us/wiki/doku.php
[16:15] <SpeedEvil> That little pen-cam if nothing else might be fun
[16:16] <Laurenceb> Alex Kennberg is launching it?
[16:16] <SpeedEvil> power, press button 4 times to record a bit, and power off.
[16:16] <jcoxon> Alex is sYx66
[16:17] <jcoxon> he is canada and is working with natrium
[16:17] <Laurenceb> ok cool
[16:17] <SpeedEvil> Laurenceb: what altitude did the rocket hit?
[16:17] <Laurenceb> SpeedEvil: is your camera working now?
[16:17] <Laurenceb> 9000
[16:17] <Laurenceb> over 9000
[16:17] <SpeedEvil> Laurenceb: over 9000?
[16:17] <SpeedEvil> :)
[16:17] <Laurenceb> yes :P
[16:17] <Laurenceb> feet
[16:18] <SpeedEvil> Laurenceb: it works in a manner suitable for taking 5s of video then turniong off.
[16:18] <Laurenceb> lol
[16:18] <SpeedEvil> Laurenceb: it still crashes if it is asked to take longer videos.
[16:18] <Laurenceb> :-(
[16:18] <jcoxon> Laurenceb, did they get data throughout the rocket flight?
[16:18] <Laurenceb> if you hadnt dismantled it you could have returned
[16:18] <SpeedEvil> Annoyingly, I screwed the case when dismantling.
[16:18] <SpeedEvil> yeah
[16:18] <Laurenceb> jcoxon: not sure yet
[16:19] <SpeedEvil> Laurenceb: chute work?
[16:19] <Laurenceb> the ant was inside the CF tube
[16:19] <Laurenceb> yes
[16:19] <SpeedEvil> recovered ok?
[16:19] <Laurenceb> it landed ~3 miles away
[16:19] <Laurenceb> we almost got shot but apart from that it was fine
[16:19] <SpeedEvil> 3 miles, with 9000 feet?
[16:19] <Laurenceb> - pidgeon shooting
[16:19] <SpeedEvil> windy, or very sideways?
[16:20] <Laurenceb> yes, the main chute deployed too early
[16:20] <Laurenceb> we couldnt even see it
[16:21] <Laurenceb> there were crazy shifts in the Tx output - more than would be expected from doppler
[16:21] <Laurenceb> fergus should have a wav of the entire flight
[16:22] <Laurenceb> it may still be possible to remove crystal stress effects due to the motor burn
[16:22] <SpeedEvil> vibration or accell induced?
[16:22] <Laurenceb> no
[16:23] <Laurenceb> hmm the accel vector reverses at burnout?
[16:24] <Laurenceb> if thats the case crystal stress effects may reverse as well - in which case it may be possible to find the doppler at that point, which is nicely close to max v
[16:24] <SpeedEvil> no GPS logs then?
[16:24] <Laurenceb> nope
[16:24] <Laurenceb> we had a few gps fixes during the descent
[16:25] <SpeedEvil> This is with the GPS raw logger, not a 'cooked' GPS?
[16:25] <Laurenceb> over RTTY, but it wasnt logging onboard
[16:25] <Laurenceb> it was a ublox5 from sparkfun
[16:26] <Laurenceb> hallam and fergus have the Se4120 boards back from pcbcart :P
[16:26] <SpeedEvil> Aren't you _way_ out of the jerk spec?
[16:26] <Laurenceb> probably
[16:26] <SpeedEvil> http://www.theonion.com/content/news/lovecraftian_school_board_member?utm_source=onion_rss_daily :)
[16:27] <Laurenceb> gps hadnt got a lock inside anyway. We powered it up and got a lock beforehand so it would have valid time and ephemeris
[16:27] <SpeedEvil> ah
[16:27] <Laurenceb> it appeared to get a lock within ~20 seconds of the chute opening
[16:27] <Laurenceb> we were retuning the radio for a while but then got packets through
[16:28] <SpeedEvil> Do you log GPS obboard?
[16:28] <Laurenceb> nope
[16:29] <Laurenceb> we got a lock through at 1.6Km but that was about a minute after the chute opened
[16:43] <Laurenceb> jcoxon: I think that PBT is m,ore resistant to ethanol than methanol
[16:43] <Laurenceb> ethanol seems to leave it uneffected, but methanol causes strenght to decrease
[16:43] <Laurenceb> -the vavle cases are PBT
[16:44] <Laurenceb> I think methalated spirit would work
[16:53] <SpeedEvil> methalated spirit is not straight methanol
[16:53] <SpeedEvil> it's more or less random ethanol + burnable stuff
[16:55] <Laurenceb> ethanol 70% methanol 30% usually
[16:55] <Laurenceb> + die
[16:59] <Laurenceb> oh and some NaCl
[16:59] <Laurenceb> which we add to the mix
[17:06] <SpeedEvil> I mean - it's a poorly specified mix often - and it's more complex to answer if that's compatible with the valve than one chemical
[17:06] <Laurenceb> most of the meths I've found has a lable on the side
[17:07] <SpeedEvil> fair enough
[17:08] <Laurenceb> with 70% ethanol 30 methanol
[17:28] <jcoxon> denatured ethanol will do the job
[17:29] <jcoxon> traditionally 90% ethanol, 10% methanol
[17:29] <jcoxon> oh wait thats teh same as methylated spirits
[17:29] <jcoxon> i'll shut up
[17:35] <Laurenceb> not quite the same
[17:47] <Laurenceb> right I'm off, cya
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[18:46] <Laurenceb> hi again
[18:47] <Laurenceb> back from my white collar existence
[18:47] <jcoxon> oh Laurenceb its not that bad!
[19:05] <Laurenceb> I'm thinking of making a "ground control" tool using octave
[19:05] <Laurenceb> crazy idea?
[19:09] <jcoxon> yup
[19:09] <jcoxon> what sort of ground control tool?
[19:09] <Laurenceb> just to display data
[19:09] <Laurenceb> I was just going to use the gnuplot api built in
[19:10] <jcoxon> hmmm interesting
[19:10] <jcoxon> how about a web based version
[19:10] <jcoxon> which could be run locally as well
[19:10] <Laurenceb> hmm
[19:10] <Laurenceb> yeah could use javascript
[19:10] <Laurenceb> no.... plotting is a pain
[19:11] <Laurenceb> I know, html page with automatic refresh
[19:11] <Laurenceb> then a octave script to make the graphics
[19:12] <Laurenceb> problem is png output from gnuplot isnt very nice
[19:12] <jcoxon> its not a very efficient system
[19:14] <Laurenceb> I'm not very good with this sort of stuff
[19:16] <Laurenceb> surely its a sensible way to do plots
[19:16] <Laurenceb> heading, temperature ect
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[19:29] <Laurenceb> jcoxon: if I have some local page on my machine, and e.g. you have 3G acess, can my page be hosted online... ?
[19:29] <Laurenceb> people just go the IP of the machine with 3G then we have a local network over wifi?
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[19:42] <Laurenceb> aha http://pchart.sourceforge.net/screenshots.php
[19:42] <Laurenceb> looks more like it :P
[19:46] <Laurenceb> "just" have to get php working on my maschine :-S
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[20:10] <Laurenceb> nyone here have experience with php?
[20:12] <jcoxon> Laurenceb, on what OS?
[20:12] <Laurenceb> ubuntu
[20:12] <Laurenceb> I'm just trying to work out session stuff thats all
[20:12] <Laurenceb> nvm I'll read a tutorial
[20:13] <jcoxon> it should be easy
[20:13] <Laurenceb> yeah, if I get that pchart thingy working
[20:24] <Laurenceb> bbl
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[21:57] <Laurenceb> hi G8KHW
[21:59] <G8KHW> hi Laurence
[22:03] <Laurenceb> ok basic question, I have a webpage hosted on my machine
[22:03] <Laurenceb> how do I make it viewable from the internet?
[22:03] <Laurenceb> http://localhost/ and I can see it
[22:03] <natrium42> map port 80 of your router to your internal IP
[22:04] <Laurenceb> if I go to my ip then :80 it not there
[22:04] <Laurenceb> I'm on a uni network
[22:04] <Laurenceb> is it even possible ?
[22:04] <natrium42> then you can't do it
[22:04] <Laurenceb> :(
[22:05] <natrium42> unless they give you an external IP, you're out of luck
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[22:06] <Laurenceb> oh well I'll have to use localhost
[22:08] <G8KHW> Laurenceb: while I remember I appologise - you were right about the doplar shift on the flight yesterday - Mach1 = 0.11% shift = about 470Hz
[22:09] <G8KHW> at 434MHz
[22:09] <Laurenceb> be interesting to look at the wav
[22:10] <jcoxon> evening all
[22:10] <G8KHW> I'm sure I had done some calculations a while ago - I was looking at doplar as a simple way of approximating rocket altitiude
[22:11] <G8KHW> Hi Jcoxon
[22:11] <jcoxon> hey G8KHW
[22:11] <jcoxon> natrium42, i've ordered 2 valves from sensortechnic
[22:11] <G8KHW> U missed a good flight yesterday
[22:11] <jcoxon> G8KHW, don't like things that go bang :-p
[22:12] <jcoxon> hehe
[22:12] <jcoxon> actually it was more that i had to see my sister
[22:14] <G8KHW> BTW I got the MFSK16 code working - just generating wav files at the mo
[22:14] <jcoxon> G8KHW, amazing
[22:14] <Laurenceb> oh sweet
[22:14] <G8KHW> its like the packet/tty/sstv code
[22:15] <Laurenceb> yeah
[22:15] <jcoxon> and will it sit well on a PIC?
[22:15] <Laurenceb> cool, hopefully I'll have time to get it on the mini rogallo
[22:15] <Laurenceb> aim now is to launch with hallam
[22:16] <jcoxon> Laurenceb, when?
[22:16] <Laurenceb> 2 weeks
[22:16] <jcoxon> weather this weekend is bad again
[22:16] <G8KHW> actually I was reasonably amazed myself - it worked 1st time after gettimg it to compile more or less
[22:17] <jcoxon> G8KHW, you've put together quite a library of tools to generate wav files :-)
[22:17] <jcoxon> packet/rtty/sstv/MFSK16
[22:17] <G8KHW> yeah it sould easilly go in the PIC - its just streight C and data tables mostly
[22:17] <Laurenceb> cool
[22:18] <Laurenceb> did you use lookup for the FEC and graycode?
[22:18] <G8KHW> yes -- 3 lookups - varicode - fec polynomial and revese greycode
[22:18] <Laurenceb> I'll use MFSK64 on the rogallo
[22:18] <Laurenceb> reverse?
[22:19] <Laurenceb> oh so it is
[22:19] <Laurenceb> ok, not a huge amount of flash I guess
[22:19] <Laurenceb> I've got 16KB on the radio anyway
[22:20] <G8KHW> the varicode is the biggest table 512 bytes, FEC 128 bytes rev greycode 16
[22:20] <Laurenceb> MFSK64 is about 25 characters per sec so thats fine
[22:20] <Laurenceb> only a bit slower than 300 buad ascii, and faster if you assume start up pulses
[22:21] <Laurenceb> erm RTTY
[22:21] <G8KHW> I rather like MFSK-16 becuse nibble handling is nice an efficent in the code
[22:21] <Laurenceb> yeah
[22:22] <Laurenceb> its much better performance than RTTY and even dominoEX
[22:22] <Laurenceb> oh well back to ground control for me
[22:22] <Laurenceb> time to get php working
[22:22] <G8KHW> I think i have a pre-amble bug to fix (or it may be a problem with truetty) - becuse i get junk before the message but all the message comes out
[22:23] <jcoxon> G8KHW, if you want anything tested i'm happy to test
[22:24] <G8KHW> thanks - i'm sure I'll think of somthing
[22:25] <Laurenceb> G8KHW: you have to fill and flush the buffers
[22:25] <G8KHW> yeah I do that
[22:25] <G8KHW> like I say I'm not convinced is not true tty
[22:25] <Laurenceb> even if the buffers are filled with 0x00 it may come out as junk
[22:25] <Laurenceb> in truetty
[22:26] <Laurenceb> probably truetty
[22:26] <G8KHW> yep - could be
[22:27] <G8KHW> jcoxon - could I email you a wav file and you could see what fldigi makes of it
[22:28] <jcoxon> yup
[22:29] <jcoxon> i could also run it through cocoamodem
[22:39] <G8KHW> jcoxon: tis sent - let me know what you decode
[22:41] <jcoxon> yup decoding now
[22:43] <jcoxon> THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG 012345678
[22:44] <G8KHW> yeah not very orriginal - any random characters before it?
[22:44] <jcoxon> nope
[22:44] <jcoxon> clean
[22:45] <G8KHW> excellent - tis truetty that is the problem
[22:45] <G8KHW> thanks for that
[22:45] <jcoxon> np
[22:46] <G8KHW> next step will be to finish it up and put it in a pic
[22:48] <jcoxon> cool
[22:51] <Laurenceb> add some noise :P
[22:54] <G8KHW> did fergus try dominoex with a VCO rather than a NCO?
[22:55] <Laurenceb> yeah it was running on badger
[22:55] <G8KHW> and a radiometrix?
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[22:57] <G8KHW> fergusnoble: did you have to correct radiometrix VCO non-linearity or did you find it linear enough on its own?
[22:58] <natrium42> jcoxon, cool
[22:58] <natrium42> jcoxon, i was creating a digikey order, but couldn't finish in time
[22:59] <natrium42> still have to decide on some of the parts, like the kind of mosfets i want to get
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[23:00] Action: Laurenceb has php working
[23:00] <Laurenceb> :P
[23:00] <Laurenceb> time for graphs
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[23:04] <shellevil> G8KHW: err - 3*10^2/3*10^8 = 10^-6 = .0001% surely - doppler
[23:04] Action: shellevil has just woken up thouggh
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[23:05] <natrium42> Laurenceb, see what you did!
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[23:06] jiffe92 (n=weechat@64.251.162.157) returned to #highaltitude.
[23:06] peddie (n=matthew@PEDDIE.MIT.EDU) returned to #highaltitude.
[23:06] akawaka (n=akawaka@bunyik.akawaka.net) returned to #highaltitude.
[23:06] <fergusnoble> G8KHW: did you catch that? think there was a netplit
[23:09] <G8KHW> shellevil: your right 0.0001% (i.e 1 in 10^6) - but that is 434Hz at 434MHz which is what I originally thought was wrong
[23:10] <natrium42> jcoxon, "by carefully releasing helium it should be possible to reduce the descent at night sufficiently"
[23:10] <natrium42> should be "ballast" instead of "helium", right? :)
[23:10] <G8KHW> fergusnoble: na missed it
[23:10] <shellevil> fer: any testing to discover any tempco of the modulation constannt?
[23:11] <fergusnoble> G8KHW: it was linear enough in the middle of the input range, got a bit dodgy close to the low end
[23:11] <fergusnoble> the tricky bit was getting the tone spacing right, fldigi seems very sensitive to having the correct spacing
[23:12] <G8KHW> thanks - ah excellent may end up using the 4 bit DAC in the PIC
[23:12] <fergusnoble> yeah, that would be good as you can adjust the end points right?
[23:12] <fergusnoble> the DAC in the arm is fixed range
[23:12] <jcoxon> natrium42, yeah
[23:12] <jcoxon> good point
[23:13] <natrium42> jcoxon, fix0red
[23:13] <Laurenceb> fergusnoble: yeah same here
[23:13] <jcoxon> thanks
[23:13] <Laurenceb> I have to tweak my setpot very well
[23:13] <Laurenceb> with MFSK it'll be a lot easier
[23:13] <G8KHW> fergusnoble - juts need to adjust the gain about the midpoint
[23:14] <G8KHW> until 0 and 15 are 234Hz apart
[23:14] <fergusnoble> ok, sounds good
[23:14] <G8KHW> (15 * 15.625)
[23:15] <G8KHW> its the same cct as the one I used for tty
[23:15] <fergusnoble> awesome
[23:16] <G8KHW> the only thing i am wondering is if the spacing changes with tempreture
[23:16] <jcoxon> G8KHW, i'm wondering for atlantic halo whether we should have a second protocol as well to transmit in
[23:16] <G8KHW> sure rtty
[23:16] <G8KHW> or cw
[23:16] <G8KHW> or HF packet
[23:17] <shellevil> norse
[23:17] <shellevil> err
[23:17] <jcoxon> rtty or cw would be good
[23:17] <G8KHW> all of which I have code for
[23:17] <shellevil> morse,yeah
[23:17] <jcoxon> brilliant
[23:19] <natrium42> Laurenceb, need any parts from digikey? since i am shipping you those venus pcbs later on?
[23:20] <Laurenceb> hmm...
[23:20] <Laurenceb> thanks
[23:20] <natrium42> np
[23:20] <Laurenceb> how long have I got?
[23:20] <natrium42> a few hours
[23:20] <natrium42> how long do you need?
[23:20] <natrium42> :)
[23:21] <natrium42> i can delay the order until tomorrow since they ship same day
[23:21] <Laurenceb> hmm havent got any projects in mind atm
[23:21] <Laurenceb> was maybe thinking of "FUGE"
[23:21] <natrium42> k, well if you think of anything let me know
[23:21] <fergusnoble> farnell is now doing free next day shipping with no minimum order btw
[23:21] <Laurenceb> F****** Huge Glider Project
[23:21] <natrium42> haha
[23:21] <Laurenceb> fergusnoble: yeah its cool
[23:22] <shellevil> natrium42: any progress on the sat locator? - data by faking location - or not llooked at it?
[23:22] <natrium42> shellevil, didn't look at it yet
[23:22] <Laurenceb> it'd need a sparkfun 5DOF IMU, atmega324p, servos(obvious) gps and radio....
[23:22] <Laurenceb> so not really any need for digikey
[23:23] <Laurenceb> oooh I know flux
[23:23] <G8KHW> night all
[23:23] <natrium42> jcoxon, need to decide how many energizer lithiums to use in series
[23:23] <Laurenceb> cya
[23:23] <natrium42> nite G8KHW
[23:23] G8KHW (n=andy@217.47.75.27) left #highaltitude ("Konversation terminated!").
[23:24] <natrium42> the 6A DC/DC converters are 14V max
[23:24] <natrium42> might use the 2.2A DC/DC converters, those have 18V max i think
[23:25] <jcoxon> hmmm, the radio is going to need quite a few
[23:25] <natrium42> maybe 8x1.5V?
[23:25] <Laurenceb> natrium42: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KE1804-ND
[23:25] <jcoxon> while the valves now only need 3v
[23:25] <natrium42> what's the charged voltage of the energizer lithiums?
[23:25] <natrium42> 1.5 exact or more?
[23:25] <Laurenceb> its not too heavy to make the postage increase?
[23:25] <jcoxon> 1.7
[23:25] <natrium42> hmm
[23:26] <natrium42> that's fine
[23:26] <natrium42> so 13.6V when charged (8 in series)
[23:26] <jcoxon> i think the radio will be 12-14v
[23:26] <natrium42> and about 8V when discharged?
[23:26] <natrium42> Laurenceb, good idea, i will add one for myself too
[23:27] <Laurenceb> its nice stuff
[23:27] <Laurenceb> leaks if upside down
[23:27] Action: Laurenceb notes big stain on desk
[23:27] <natrium42> that's not rosin, eh?
[23:27] <Laurenceb> its no clean so I guess not
[23:29] <jcoxon> natrium42, so 8 cells in series then a load in parallel
[23:29] <natrium42> yes
[23:29] <natrium42> what do you think?
[23:29] <jcoxon> hmmm need to calculate it i guess
[23:30] <natrium42> maybe (8x1.5V) times 3
[23:30] <natrium42> sYx66 got quite a few cells from energizer for free
[23:30] <jcoxon> what sort of mAh do energizers do?
[23:31] <natrium42> hmm, datasheet is on their page
[23:32] <natrium42> 2000mAh
[23:32] <Laurenceb> http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8283&Product_Name=DG-1000_Fibreglass_Electric_Glider_2.63M__(102in)_ARF
[23:32] <Laurenceb> ^ FUGE
[23:32] <natrium42> http://www.batterystore.com/Eveready/EvereadyPDF/ELCRV3.pdf
[23:32] <natrium42> actually, 3000mAh
[23:33] <shellevil> Laurenceb: also - someone else...
[23:33] <shellevil> Laurenceb: mouser is free orders over 50 quid
[23:33] <shellevil> free ship
[23:33] <shellevil> It's way too east to exceed 50 quid :(
[23:33] <natrium42> mouser is slower than digikey for me though
[23:33] <natrium42> i get digikey orders the next day if ordered by 5pm or so
[23:33] <jcoxon> what do you reckon our consumption will be?
[23:34] <SpeedEvil> natrium42: yes - I mean for US->UK orders
[23:34] <natrium42> not sure yet, i did some estimates on the private wiki
[23:34] <jcoxon> oh yeah i started to transfer that over and got bored
[23:34] <natrium42> sat phone is about 2200mA
[23:34] <natrium42> that's probably the biggest
[23:34] <Laurenceb> I did a cpu cycle count of my quaternion based IMU code, and it should run in 16ms on a 20MHz avr, so you could fly that with an AVR and sparkfun IMU
[23:35] <natrium42> but it's going to be only on for 500 minutes maximum
[23:35] <jcoxon> natrium42, whats the plan with the sat phone
[23:35] <natrium42> 2nd flight probably
[23:35] <jcoxon> still second flight?
[23:35] <jcoxon> okay cool
[23:35] <jcoxon> just making sure
[23:35] <natrium42> i will see where i can get with the spot
[23:35] <natrium42> need to extend satphone minutes anyway
[23:35] <jcoxon> so for the first flight our power consump ill be quite low
[23:36] <SpeedEvil> natrium42: what's the spot's battery normally?
[23:36] <natrium42> SpeedEvil, two energizer lithiums
[23:36] <natrium42> i think it's enough for a few days of tracking
[23:38] <jcoxon> hmmm should really put a section on the wiki
[23:45] <natrium42> gah, why are 47uF tantalums so expensive :S
[23:46] <natrium42> $6.77 each
[23:46] Action: SpeedEvil missed out on getting a big batch of non RoHS stuff
[23:46] <SpeedEvil> (tant)
[23:47] <natrium42> this series goes down to -55C
[23:47] <SpeedEvil> ah
[23:48] <natrium42> great, 12 capacitors for $81.32 :S
[23:49] <SpeedEvil> I suppose film are too large
[23:49] <jcoxon> ouch
[23:49] <SpeedEvil> 47uf
[23:49] <SpeedEvil> oops
[23:49] <natrium42> SpeedEvil, the problem is that the DC/DC converters need special ones
[23:50] <natrium42> oh well, at least they are very high efficiency
[23:50] <SpeedEvil> what volts?
[23:50] <natrium42> 96%
[23:50] <natrium42> the caps? 35V
[23:51] <SpeedEvil> that's niobium out anyway
[23:52] <SpeedEvil> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=495-1585-1-ND
[23:52] <SpeedEvil> ?
[23:54] <SpeedEvil> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=495-1582-1-ND *(2 = 130mR
[23:56] <SpeedEvil> Or even 4* http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=718-1071-1-ND
[23:57] <natrium42> SpeedEvil, http://focus.ti.com/docs/prod/folders/print/ptr08060w.html
[23:58] <jcoxon> night all
[23:58] <natrium42> they have some weird requirements in the datasheet
[23:58] <SpeedEvil> could even go 100*http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=718-1539-1-ND for cheaper. (160uF total, 40mR ESR)
[23:58] <natrium42> nite jcoxon
[23:58] jcoxon (n=jcoxon@host86-146-165-98.range86-146.btcentralplus.com) left irc: "Leaving"
[23:58] <SpeedEvil> night
[23:59] <natrium42> http://focus.ti.com/lit/ds/symlink/ptr08060w.pdf starting at page 9
[00:00] --- Tue Mar 3 2009