highaltitude.log.20110103

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[00:03] <jcoxon> ping Zuph
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[00:05] <Zuph> pong jcoxon
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[00:12] <jcoxon> hey Zuph, just a quick question - still on for launch next weekend?
[00:13] <Zuph> So far, ask again Tuesday!
[00:13] <jcoxon> hehe, just making plans to be free...
[00:13] <Zuph> We're actually getting around to *testing* this time around!
[00:13] <Zuph> :)
[00:13] <jcoxon> flying hte HF radio as well?
[00:14] <Zuph> We're supposed to. Haven't heard from WB8ELK recently, though.
[00:14] <jcoxon> hehe, yeah would be worth gently kicking him
[00:15] <jcoxon> think it'll come in handy for your first flight
[00:15] <Zuph> Yeah
[00:15] <Zuph> We do too
[00:15] <jcoxon> well the dl-fldigi/spacenear.us is ready to go
[00:15] <Zuph> Heh, we pulled one of his 2M radios out of a tree today :-p
[00:15] <jcoxon> i'll release a new version before hand- we've got rig control in the interface and also frequency tracking - if the signal goes off the waterfall it can retune the radio
[00:16] <Zuph> Awesome :)
[00:17] Action: russss wonders what the best multiband HF antenna he can construct within the 8m x 3m x 2m space on his roof is
[00:17] <jcoxon> okay, well i'll be around next weekend - just get in touch if you need anything organised etc - happy to help out
[00:17] <Zuph> Awesome! We really appreciate it.
[00:18] <jcoxon> russss, magnetic loop?
[00:18] <russss> maybe I need some kind of clandestine telescopic tower that I can hoist up
[00:18] <jcoxon> russss, you need a stealth antenna
[00:18] <SpeedEvil> russss: I note that wind turbines with up to - IIRC - 6m above the ridgeline require no planning permission.
[00:18] <russss> yeah, I mean I have plenty of vertical space available but it's just a question of how far I can go without violating the conservation area laws
[00:19] <SpeedEvil> russss: So - get a 5.9m pole, and a 0.1m fan.
[00:19] <russss> haha
[00:19] <fsphil> I've not had much luck with verticals
[00:19] <jcoxon> russss, does the hackspace have roof space?
[00:20] <russss> not really. There is roofspace on the building, but we don't technically have access to it (one of the doors is kicked in) and there is a mobile phone transmitter up there
[00:20] <russss> so I think even if we asked for permission, they'd probably say no on account of the mobile transmitter
[00:21] <russss> added to that, the accessible bit of roof is about ~60m away from our actual space (the rest of the roof is wriggly tin)
[00:21] <jcoxon> russss, i reckon a stealth 10m vertical, that is deployable
[00:22] <russss> I've got 4m of PVC pipe on my roof already for the UHF
[00:22] <russss> 10m would require a fair amount of support
[00:23] <fsphil> the vertical will need radials too
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[00:27] <russss> magnetic loop antennas are crazy
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[00:29] <fsphil> crazy money
[00:30] <jcoxon> russss, is this for txing
[00:30] <jcoxon> ?
[00:30] <russss> not currently
[00:30] <russss> just rx
[00:30] Action: russss is still trying to sort out the whole getting-a-license thing
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[00:30] <russss> I have a ~15m random wire up there at the moment but it doesn't seem to be great. I think that might just be a ground plane thing though
[00:31] Action: MrCraig still wants to get licensed.
[00:31] <jcoxon> russss, yeah grounding is key
[00:31] <jcoxon> i'm going to throw up a long wire as well
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[00:31] <russss> it tends to sit in a puddle of water at the moment, which is probably suboptimal
[00:31] <jcoxon> remember when we played with radios in the hold hackspace
[00:31] <jcoxon> and the improvment when we grounded it to the copper piping
[00:32] Action: SpeedEvil1 goes to hunt for a telecoms engineer.
[00:32] <jcoxon> old8
[00:32] <russss> so I think I need to get it slightly raised up
[00:32] Action: SpeedEvil1 sighs.
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[00:33] <jcoxon> russss, how about a slinky antenna
[00:33] <russss> also I had to take my feed wire down because it was running through the top floor which we're trying to finish refurbishing
[00:34] <jcoxon> right night all
[00:34] Action: jcoxon has to work tomorrow
[00:34] <MrCraig> night jcoxon - work on a bank holiday? sux
[00:34] <SpeedEvil> Good luck.
[00:34] <fsphil> night jcoxon
[00:34] <jcoxon> MrCraig, yeah on call
[00:34] <jcoxon> nice 13hr day
[00:34] <MrCraig> ugh!
[00:34] <fsphil> hope it's an easy 13hrs
[00:35] <SpeedEvil> Silly people getting sick at odd hours.
[00:35] <jcoxon> i know!
[00:35] <jcoxon> night
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[01:29] <DanielRichman> Laurenceb_ / Laurenceb: are you there?
[01:31] <juxta> hi all
[02:05] <DanielRichman> Laurenceb_: I think I might have a solution to your bug
[02:05] <DanielRichman> http://pastie.org/private/kct7h3n5l5hjing08tnww
[02:06] <DanielRichman> and if that works, I think I know why.
[02:06] <DanielRichman> (it appears to work for me)
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[02:14] <DanielRichman> actually; that changes the UI hang into a consistant FPE
[02:14] <DanielRichman> it randomly worked once >.>
[02:28] <DanielRichman> ok I've *actually* fixed it now
[02:29] <DanielRichman> http://pastie.org/private/3x18vpiol02dgcujoexszq
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[02:31] <DanielRichman> So I think there is a race condition. libsndfile's close() function is called by the thread that does the UI Stuff when you uncheck the checkbox
[02:31] <DanielRichman> libsndfile's read function is called by the audio thread.
[02:32] <DanielRichman> now what happens is that this close function destroys the libsndfile object while the other thread is in the middle of calling read() - and therefore bad things happen, a SIGFPE caused by a divide by zero, or a deadlock. I'm suprised there wasn't any SIGSEGV
[02:32] <DanielRichman> This bug affects the fldigi playback code, not just Stream
[02:32] <DanielRichman> however it would hardly ever have any effect on the playback code, since that code spends all of its time blocked inside sleep() - so it doesn't matter
[02:33] <DanielRichman> your code, Stream, spends all of its time blocked inside read() - so it has a very high chance of causing problems
[02:33] <DanielRichman> anyway "so it doesn't matter" isn't true - imo the bug should be fixed everywhere. But adding a quick mutex seems to fix things for now.
[02:38] Nick change: TraumaPrincess -> TraumaPony
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[03:23] <SpeedEvil> :)
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[05:57] <Darkside> hmm
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[10:56] Action: MrCraig is cold
[11:05] <fsphil> the sun is out here -- first time in ages :)
[11:20] <MrCraig> I'm indoors, heating on - still cold o.O
[11:21] <MrCraig> think I'm gonna brave the outdoors to fetch some food stuffs and then cower under a blanket.
[11:28] <GW8RAK> Morning All. It would also be nice to see some sun here.
[11:28] <GW8RAK> But I've been busy sorting out and have some ARRL Handbooks going free to a good home, apart from postage. Does anyone want one or many?
[11:31] <Laurenceb_> hi all
[11:31] <Laurenceb_> DanielRichman: thats for the help with fldigi
[11:31] <Laurenceb_> unfortunately it doesnt seem to be fixed
[11:35] <Laurenceb_> in fact its exactly the same as before...
[11:38] <fsphil> GW8RAK, what's the handbooks about?
[11:38] <GW8RAK> They are intro to radio books published by the US equivalent of the RSGB.
[11:39] <GW8RAK> They cover all the theory and practical needed to pass the ARRL Technical exam
[11:39] <GW8RAK> Which is out full amateur licence.
[11:40] <fsphil> ah, probably a bit over my head then
[11:40] <GW8RAK> They are from the '80's and 90's, but although some things have changed, the bits on aerials etc have not changed.
[11:40] <GW8RAK> They start at the basics and then progress fairly quickly.
[11:42] <Laurenceb_> close(28) = 0
[11:42] <Laurenceb_> read(21, <unfinished ...>
[11:42] <Laurenceb_> +++ killed by SIGFPE +++
[11:42] <Laurenceb_> 28 is the pipe
[11:51] <Darkside> ok, horus launch tomorrow
[11:51] <Darkside> Horus 12a
[11:51] <Darkside> 0230GMT
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[12:13] <Laurenceb_> DanielRichman: ok I've fixed it - needed to add more mutex stuff
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[12:49] <Darkside> scratch that
[12:49] <Darkside> it's Horus 13
[12:49] <Darkside> >_>
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[13:19] <fsphil> cool - my ft817 voltage meter was showing a >2v drop when transmitting. put a small clip-on ferrite on the power lead and it's now only 0.5v
[13:20] Action: Laurenceb_ was thinking about psk transmission
[13:21] <Laurenceb_> i had an interesting idea- using a balun and rf switch you could do bpsk with a unmodulated ntx2
[13:21] <Laurenceb_> might even be practical with a microstrip network
[13:21] <fsphil> use the balun to reverse the phase?
[13:22] <Laurenceb_> yes
[13:22] <fsphil> neat
[13:22] <Laurenceb_> at 434mhz, microstrip stuff is rather large
[13:22] <fsphil> or just a long wire
[13:23] <Darkside> coil of coax :P
[13:23] <Laurenceb_> i think wire wound is best
[13:23] <Laurenceb_> ill see whats avaliable
[13:24] <fsphil> that would be a neat trick, how much rf would be lost in the switching?
[13:24] <Laurenceb_> <1dB if done properly
[13:25] <Laurenceb_> you can do pck by modulating the ntx2, but it wont be very coherent
[13:25] <Laurenceb_> this way would be really coherent
[13:25] <fsphil> and would work with any module
[13:28] <Laurenceb_> might be simplest to make the blun by hand
[13:28] <Laurenceb_> most of the off the shelf stuff is tuned
[13:32] <SpeedEvil> diode switches work well
[13:32] <SpeedEvil> How coherent in phase is the ntx2?
[13:34] <DanielRichman> Laurenceb_: gdb provided more info on the SIGFPE than strace did. I don't understand why there is the same code several times in sound.cxx; I guess my fldigi was configured differently to yours so it was using another one. Good that its now fixed ;)
[13:44] <Laurenceb_> thanks for the help
[13:44] <Laurenceb_> yeah sound.cxx seems very disorganised to me
[13:44] <Laurenceb_> SpeedEvil: ntx2 looks pretty clean - very little jitter
[13:45] <Laurenceb_> the drift is the most significant thing really
[13:45] <SpeedEvil> ah
[13:45] <Laurenceb_> so ntx2 -> unbalanced port -> 50 to 100 ohm unbalanced/balanced balun
[13:46] <Laurenceb_> then the switch is double throw between the two balanced ports of the balun
[13:47] Action: SpeedEvil wonders what bpsk with another symbol comprised of no output is.
[13:47] <Laurenceb_> i suspect that the parasitic capacitance of the switch will mess up the impedance slightly
[13:47] <Laurenceb_> might need a small inductor or cap in there somewhere to cancel it out
[13:48] <Laurenceb_> unfortunately all the neat off the shelf smd baluns i can find are tuned and for higher frequencies
[13:50] <Laurenceb_> this would be very neat as you could use a conventional bpsk decoder with kostas loop and pll
[13:50] Action: SpeedEvil wonders of ways round the balun.
[13:51] <SpeedEvil> I suppose most would end up somewhat assymetric.
[13:51] <SpeedEvil> the simple ways
[13:53] <Laurenceb_> there are inductor cap circuits
[13:53] <Laurenceb_> but i dont know if theyd work with the switch arrangement
[13:53] <Laurenceb_> need to get out spice i guess
[13:59] <Laurenceb_> aha http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=445-3994-1-ND
[13:59] <Laurenceb_> slightly high loss but its small
[14:01] <Laurenceb_> so pin 1 to ntx2 and pins 3 and 4 to the rf switch
[14:02] <Laurenceb_> actually only 1dB insertion loss at 434
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[14:33] <Laurenceb_> combine that with jcoxons heated xtal technique and itd be pretty awesome
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[20:03] <Laurenceb_> http://angryflower.com/experi.html
[20:03] <Laurenceb_> lol
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[20:08] <SpeedEvil> Seen oglaf?
[20:08] <SpeedEvil> http://www.oglaf.com/ (mildly nsfw)
[20:11] <Laurenceb_> SpeedEvil *sigh*
[20:11] <Laurenceb_> we try to keep this place family friendly
[20:12] <SpeedEvil> Sorry - 4chan broke my family friendly filter.
[20:13] Action: SpeedEvil will try harder.
[20:14] <SpeedEvil> I keep forgetting there are fragile little minds here occasionally.
[20:17] <SpeedEvil> http://www.gla.ac.uk/news/headline_183814_en.html fun
[20:17] <SpeedEvil> (massive parallelsim inside FPGA)
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[20:32] Nick change: ms7821 -> msg
[20:32] Nick change: msg -> ms7821
[20:35] <Darkside> SpeedEvil: woo oglaf!
[20:40] Nick change: Nigey|Away -> Nigey
[20:41] <Nigey> plop
[20:59] Nick change: Nigey -> Nigey|Away
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[21:25] <Darkside> morning juxta
[21:26] <juxta> morning Darkside
[21:27] <Darkside> are you gonna do a launch announcement for todays launch?
[21:30] <Darkside> haha adrian just hopped in his car
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[21:31] <Darkside> time to get ready then..
[21:31] <juxta> nah wont bother to announce, but I have just setup the tracker
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[21:31] <Lunar_Lander> hello
[21:31] <juxta> heya Lunar_Lander
[21:32] <Lunar_Lander> how's life?
[21:32] <juxta> good good
[21:33] <Lunar_Lander> mine too
[21:33] <juxta> just heading off to get ready for a launch today
[21:33] <Lunar_Lander> ah
[21:33] <Lunar_Lander> which one?
[21:33] <juxta> Horus 13
[21:34] <juxta> ok, back soon
[21:34] <Lunar_Lander> ok cu
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[21:57] <Darkside> aaaargh
[21:57] <Darkside> ok my dad has been notified juxta
[21:57] <Darkside> he
[21:58] <Darkside> he's going to try and decode
[21:58] <Darkside> he'll also try and contact me at some point during the day on the radio
[22:00] <Lunar_Lander> hi Darkside
[22:01] <Darkside> hi
[22:02] <Lunar_Lander> how's life?
[22:03] <Darkside> good :P
[22:06] <Lunar_Lander> yay
[22:06] <Lunar_Lander> how is 13?
[22:06] <Lunar_Lander> is it ready to launch?
[22:07] <Darkside> i dont think juxta has left yet
[22:08] <Darkside> i'll be out chasing a bureau balloon before the horus launch, so i won't be able to live tweet :P
[22:08] <Lunar_Lander> ah
[22:08] <Lunar_Lander> a "normal" weather balloon you mean?
[22:08] <Darkside> yup
[22:08] <Darkside> analog too
[22:08] <Darkside> so we have to use RDF techniques
[22:09] <Lunar_Lander> ah
[22:09] <Lunar_Lander> btw
[22:10] <Lunar_Lander> http://cgi.ebay.com/Vaisala-Radiosonde-RS80-15GH-Digital-GPS-WeatherStation-/170500453667?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item27b29e7523#ht_3769wt_1139
[22:11] <Darkside> wow only 10 pounts
[22:11] <juxta> thats super cheap
[22:11] <Darkside> im buying 2
[22:12] <SpeedEvil> It does not output proper GPS
[22:12] <Darkside> what
[22:12] <SpeedEvil> I've got several
[22:12] <Darkside> what eoes it do then
[22:12] <Darkside> before i buy
[22:12] <SpeedEvil> However.
[22:12] <juxta> yeah it doesnt correlate a fix Darkside
[22:12] <Darkside> whatwhatwhat
[22:12] <SpeedEvil> The string is _wonderful_ floss.
[22:12] <Darkside> explain
[22:12] <juxta> you correlate it on the ground with a copy of the ephemris
[22:12] <Darkside> holy crap
[22:12] <Darkside> wow
[22:12] <Darkside> so how do you do that?
[22:13] <Darkside> software available?
[22:13] <juxta> there's a bit of software called sondemonitor
[22:13] <Darkside> oh
[22:13] <juxta> yeah
[22:13] <Darkside> i should write my own code to do it :D
[22:13] <Darkside> what does it transmit? ASCII Data that you parse and decode?
[22:13] <SpeedEvil> no
[22:13] <Lunar_Lander> can you snip off the transmitter of it and make it record the data onto a SD or so?
[22:13] <juxta> a horrible binary mess I think
[22:13] <Darkside> aww
[22:13] <juxta> does a good job, but the author never worked out the FEC, so you get some bad cells
[22:13] <SpeedEvil> It's some horrible binary protocol that I looked for the specs a couple of ears ago, and had no luch at lal tracking down
[22:13] <Darkside> hrmmm
[22:13] <Darkside> well that sucks
[22:13] <SpeedEvil> It does have useful bits
[22:13] <Darkside> might not buy any then
[22:14] <SpeedEvil> a pressure sensor, and thermocouple.
[22:14] <juxta> sondemonitor can output to a serial port though
[22:14] <SpeedEvil> I paid a couple of quid for mine, and the string has been totally worth that
[22:14] <Darkside> hahaha
[22:14] <Darkside> yeah ok
[22:14] <Darkside> i'll get one then
[22:14] <Darkside> depending ont eh chipping
[22:14] <SpeedEvil> Oh - they also have a nice wire GPS antenna
[22:14] <Darkside> shipping*
[22:14] <juxta> yeah, the pressure sensor is calibrated out of the box, I think the temp sensors need calibration prior to launch
[22:14] <Lunar_Lander> yeah can't you like disassemble its sensors?
[22:14] <SpeedEvil> a helical with a LNA after it
[22:14] <Laurenceb_> hmm surely theres not enough bandwidth for that
[22:14] <Darkside> juxta: i've let my dad know, and he'll get VK5ALX to decode
[22:14] <juxta> oh nice, thanks :)
[22:14] <Laurenceb_> maybe it bumps short sections of data
[22:14] <Darkside> and he'll have a go himself
[22:15] <Laurenceb_> *dumps
[22:15] <Lunar_Lander> can it be that it's made so you have to have vaisala's receiver?
[22:15] <SpeedEvil> Of course
[22:15] <juxta> you can receive with regular amateur radio gear
[22:15] <SpeedEvil> Recieving isn't the problem, it's decoding
[22:16] <juxta> yeah
[22:16] <Lunar_Lander> yes
[22:16] <Laurenceb_> i wonder what the hardware is like inside
[22:16] <juxta> SpeedEvil, http://www.coaa.co.uk/sondemonitor.htm
[22:16] <Laurenceb_> i have a few but never done a proper teardown
[22:16] <Darkside> i guess turning on the transmitter would be illegal, right?
[22:16] <SpeedEvil> neat
[22:16] <Lunar_Lander> it says it has a water activated battery
[22:16] <Laurenceb_> maybe use it a software gos
[22:16] <SpeedEvil> Lunar_Lander: yes
[22:16] <SpeedEvil> Lunar_Lander: it's in another sealed bag
[22:16] <Laurenceb_> *gps
[22:16] <Lunar_Lander> yea
[22:17] <juxta> they work fine on AA's though ;p
[22:17] <Lunar_Lander> juxta does sondemonitor decode what the vaisala xmits?
[22:17] <juxta> yes
[22:17] <SpeedEvil> Lunar_Lander: It fits in the rectangular cutout of the rectangle of the GPS that ousee there
[22:17] <Lunar_Lander> yea
[22:17] <Darkside> hmm i wont bother getting one atm then
[22:18] <Lunar_Lander> btw, Vaisala gives away a book on their company history away for free
[22:18] <juxta> Laurenceb, http://projecthorus.org/wp-content/uploads/2009/12/IMG_32611.jpg
[22:18] <Lunar_Lander> i asked them what the shipping is and they said it costs nothing
[22:18] <juxta> left hand side is one of the analogue sondes, right is the digital with GPS etc
[22:18] <Laurenceb_> oh wow thanks
[22:19] <juxta> all of the chips are labelled vaisalla though
[22:19] <Lunar_Lander> the right is that RS-92 or so?
[22:19] <Laurenceb_> any chance of a higher res shot of the gps?
[22:19] <Laurenceb_> i cant make out the ic in the middle
[22:19] <juxta> Laurenceb, yeah, I have one I think, hold on
[22:19] <Laurenceb_> ooh they have custom silicon
[22:19] <Laurenceb_> very shiny
[22:20] <Darkside> very expensive
[22:20] <Darkside> i wonder what the micro in it is
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[22:21] <Laurenceb_> actually, that could be a discreet downconversion chain
[22:21] <Darkside> someone want to start the twitter follower?
[22:21] <Darkside> follow #arhab
[22:22] <juxta> Laurenceb, got photoshop or similar?
[22:22] <Laurenceb_> theres certainly a lot of stuff inside the gps sheild
[22:22] <Laurenceb_> gimp yes
[22:22] <Randomskk> Darkside: is there a user to follow rather than a hashtag?
[22:22] <juxta> ok, hopefully gimp can open RAW files
[22:22] <Laurenceb_> ok
[22:23] <juxta> Laurenceb_, http://iSendr.com/DqSm
[22:23] <Darkside> Randomskk: either projecthorus or darksidelemm
[22:23] <Laurenceb_> im thinking maybe its a discreet single conversion receiver
[22:23] <Darkside> im not sure if juxta will be tweeting
[22:23] <juxta> I left it as RAW so that you can best manipulate the contrast etc
[22:23] <Darkside> i won't be there for the launch, but i can still tweet some stuff as i hear it on the radio or whatever
[22:23] <Darkside> ok adrian is on the move it seems
[22:24] <juxta> yeah I'll tyr to
[22:24] <Laurenceb_> im getting file unavaliable
[22:24] <juxta> oh thats odd
[22:24] <juxta> sec
[22:24] <Laurenceb_> thanks
[22:24] <Darkside> well i think adrian is on his way here..
[22:24] <juxta> Laurenceb_, http://bogaurd.net/laurenceb/
[22:25] <Laurenceb_> thanks
[22:25] <Lunar_Lander> SpeedEvil
[22:25] <Lunar_Lander> are the sensors in the Vaisala good to be used on their own?
[22:27] <natrium42> hey juxta
[22:27] <natrium42> what's the payload?
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[22:28] <juxta> hey natrium42
[22:28] <juxta> it's a video rig
[22:28] <Darkside> oh shit adrian is almost here
[22:28] <Darkside> aaaaaaaaaaaa
[22:28] <Darkside> ok
[22:28] <juxta> haha
[22:29] <juxta> im heading off now too
[22:29] <Darkside> cya :P
[22:29] <juxta> cya in a while Darkside
[22:29] <Darkside> yup
[22:29] <juxta> I'll jump on irc when I get to the launch site
[22:29] <juxta> wind is <1km/h here
[22:29] <juxta> hopefully the same at launch
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[22:35] <Laurenceb_> juxta: whats the format of that raw file?
[22:36] <Laurenceb_> bits etc
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[22:36] <Laurenceb_> oh got it nvm
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[22:38] <Laurenceb_> that square QFN (or whatever it is) towards the bottom of the gps area, any chance you could get a close up?
[22:38] <Laurenceb_> im trying to read the number
[22:39] <SpeedEvil> It's a custom thingy
[22:39] <SpeedEvil> it was a qfp at least the ones I got
[22:39] <SpeedEvil> I don;'t kknow where mine are at teh moment thouh
[22:40] <Lunar_Lander> SpeedEvil
[22:40] <Lunar_Lander> are the sensors in the Vaisala good to be used on their own?
[22:41] <SpeedEvil> In principle sure
[22:41] <SpeedEvil> however - I have not investigated this at all
[22:41] <Lunar_Lander> yeah
[22:42] <Laurenceb_> thats annoying if everythings custom
[22:42] <Laurenceb_> guess its still worth probing around with a scope
[22:43] <SpeedEvil> It outputs a binary datastream.
[22:43] <Laurenceb_> see if theres any raw gps getting fired about
[22:43] <SpeedEvil> At a reasonable though not extreme datarate
[22:43] <Laurenceb_> bbl
[22:43] <SpeedEvil> there is one chip that takes GPS in and outputs the modem signals
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[22:53] <eroomde_> is anything new?
[22:54] Nick change: eroomde_ -> eroomde
[22:54] <SpeedEvil> Not really.
[22:54] <SpeedEvil> Darkside got all excited about the radiosondes on ebay that I suspect most of us have gotten excited about at one point or anotehr.
[22:55] <Lunar_Lander> yeah
[22:55] <Lunar_Lander> that is true
[22:56] <SpeedEvil> If you work out the GPS coding, you in principle have a cheap fairly-high-power, moderately light GPS, along with a cheap transmitter
[22:57] <Lunar_Lander> yrah
[22:57] <Lunar_Lander> yeah
[22:57] <Lunar_Lander> and the sensors
[22:58] <SpeedEvil> You'd need to document those though
[22:59] <Lunar_Lander> how do you mean?
[22:59] <Laurenceb_> i came up with a neat way to do psk
[22:59] <Laurenceb_> ntx2 + balun + rf swtich
[23:01] <eroomde> ahem
[23:01] <eroomde> neat?
[23:01] <Laurenceb_> totally hacked way XD
[23:01] <SpeedEvil> Lunar_Lander: work out what the voltages are
[23:01] <eroomde> why not use one of thos co-ax relayes
[23:01] <eroomde> you could probably get 31Hz outa them :p
[23:01] <Laurenceb_> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=445-3994-1-ND
[23:02] <Laurenceb_> the switch is easy
[23:02] <Lunar_Lander> ah thanks
[23:02] <Laurenceb_> you can get smd diode switches that switch in nanoseconds
[23:02] <Laurenceb_> smd baluns are a little hard to find - have to get from digikey
[23:03] <Laurenceb_> skyworks make tons of suitable switch stuff
[23:03] <eroomde> for the sake of being kind to the rest of the spectrum, maybe a bpf?
[23:03] <Laurenceb_> heh probably
[23:03] <eroomde> saw + amp
[23:03] <eroomde> maybe
[23:03] <Laurenceb_> saw has high loss
[23:03] <Laurenceb_> LC filtering
[23:03] <eroomde> hence the '+ amp'
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[23:03] <Laurenceb_> yeah - i was trying to keep it simple
[23:04] <Laurenceb_> if you were going to those lenghts DDS + upconvertor is easier
[23:09] <eroomde> or dds + bpf :)
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[23:45] <Darkside> suo
[23:46] <Darkside> sup
[23:46] <Darkside> heh
[23:46] <Darkside> back to chasing BOM balloons
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[00:00] --- Tue Jan 4 2011