highaltitude.log.20101229

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[01:14] Nick change: DR_food -> DagoRed
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[02:44] <KB5JBV> anybody home
[02:44] <natrium> kinda, about to leave
[02:44] <natrium> to see the daft punk movie
[02:44] <KB5JBV> Trying to track down w1hkj
[02:45] <natrium> i have never seen him here
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[02:46] <KB5JBV> ok thanks
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[02:46] <natrium> do you have questions regarding dl-fldigi?
[02:46] <natrium> ...
[03:23] <jiffe98> daft punk movie?
[03:23] <jiffe98> tron?
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[05:54] <natrium> jiffe98, yep
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[09:47] <Laurenceb_> yawnz
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[10:07] <UpuWork> morning
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[11:07] <m1x10> Just got the long waited 100mw 144.8 radio from radiometrix
[11:29] <UpuWork> We got the iPhone tracker working :) http://ava.upuaut.net/tracker
[11:29] <UpuWork> could pop this in a balloon and launch it :)
[11:43] <UpuWork> right thats some balloons ordered
[11:46] <Laurenceb_> nice
[11:46] <Laurenceb_> whats the code written in?
[11:47] <UpuWork> err
[11:47] <UpuWork> objective c apparently
[11:48] <UpuWork> I didn't do it
[11:48] <UpuWork> http://ava.upuaut.net/
[11:49] <UpuWork> 24" cross form parachute going to be ok for 800gram load ?
[11:52] <Laurenceb_> interesting - is that apple approved?
[11:53] <Laurenceb_> its running natively?
[11:54] <UpuWork> Yeah native I have a developer certificate atm but he's submitting it to App Store
[11:54] <Laurenceb_> ah
[11:54] <Laurenceb_> yeah thats why iphone sucks
[11:55] <Laurenceb_> the nexus s looks good, but the way the java is implimented makes it pretty useless for low latency control
[11:55] <Laurenceb_> i wanted to use it for uav control
[11:55] <UpuWork> yeah just having a discussion about backgrounding it :)
[11:55] <UpuWork> anyway afk lunch
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[13:04] <UpuWork> How many litres of gas go in a 1000g balloon ?
[13:09] <fsphil> the burst calculator can tell you I think
[13:10] <fsphil> depends on the ascent speed and payload weight
[13:11] <UpuWork> hmm
[13:12] <UpuWork> whats a good accent rate ? :)
[13:12] <fsphil> 5 seems to be what most aim for - no idea why :)
[13:12] <fsphil> I suppose any faster would cause it to burst earlier
[13:12] <fsphil> and need more helium
[13:13] <UpuWork> 4.5m/s
[13:13] <UpuWork> 3m^3 helium
[13:13] <UpuWork> 3000 liters ?
[13:13] <UpuWork> wow
[13:14] <fsphil> how heavy is your payload?
[13:14] <UpuWork> Yeah just about to start making some calls to source some helium suppliers
[13:14] <UpuWork> 650-700g
[13:14] <UpuWork> 1600g balloon
[13:15] <fsphil> 700g payload, 1500g balloon, 4.5m/s ascent - says 2701 L
[13:16] <fsphil> ack
[13:16] <fsphil> I'm on hydrogen
[13:16] <UpuWork> 118480.6 feet
[13:16] <fsphil> wow indeed
[13:16] <fsphil> a T-sized canister should do it though
[13:17] <UpuWork> T-sized rgr
[13:17] <fsphil> they contain 3.6m3
[13:22] <UpuWork> I'll see if I can get one of those sorted out
[13:26] <Laurenceb_> if you work it out in L it is going ot be large :P
[13:26] <Laurenceb_> CUSF have one of the full height cylinders on standby
[13:27] <UpuWork> Not sure where I'll be able to launch from atm
[13:27] <UpuWork> just mailed Rob Harrison to see how he's getting on with a York NOTAM
[13:36] <Laurenceb_> iirc its possible to get it to <£50 for the helium per launch
[13:36] <fsphil> from boc, or cusf?
[13:43] <UpuWork> http://www.ukhas.org.uk/_detail/ideas:filler.jpeg?id=ideas:balloon_filler
[13:43] <UpuWork> so thats all I need to fill it ? :)
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[13:50] <fsphil> duct tape had to be involved at some point
[13:51] <UpuWork> http://www.isgroupplc.com/content/helium-gas-cylinder-t-size £33.65 + a monthly rental fo £6.45
[13:51] <UpuWork> of
[13:57] <fsphil> nice find!
[14:01] <fsphil> they're business only
[14:01] <fsphil> hmm
[14:01] Action: fsphil puts on his cunning hat
[14:01] <UpuWork> negative houston
[14:01] <UpuWork> jsut called them
[14:02] <UpuWork> they have a depot 10 mins from here
[14:02] <Darkside> as cunning as mr cunning j fox who took a masters degree in cunning at cunningham university?
[14:02] <UpuWork> "lol"
[14:03] <fsphil> almost as cunning as that!
[14:03] <fsphil> I wonder if any BOC dealer would do
[14:03] <fsphil> I've got one practically next door
[14:08] <UpuWork> Ah it's a BOC one
[14:08] <UpuWork> http://www.boconline.co.uk/boc_retail_stores/bradford.asp
[14:23] <UpuWork> neck diameter on these is 83mm
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[14:33] <G4TNX> Good afternoon, any Ardunio experts out there who can save my sanity?
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[14:50] Action: m1x10 builds his APRS ground station
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[14:56] Action: SpeedEvil farts.
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[15:27] <Nigey|Away> weeeeee
[15:27] <Nigey|Away> \o/
[15:28] Nick change: Nigey|Away -> Nigey
[15:28] <Nigey> anyone rooted a Desire HD ?
[15:29] <SpeedEvil> Nope.
[15:29] <SpeedEvil> My last two phones both came pre-rooted
[15:29] <Nigey> dam
[15:29] <Nigey> my new Desire has all the orange crap on there that desperately needs to go !
[15:40] <m1x10> VERY NICE NOW: http://www.nasa.gov/multimedia/isslivestream.asx
[15:49] <SpeedEvil> Oh - it's a wide-angle lens.
[15:49] <SpeedEvil> I was confused by the bottom moving faster than the top
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[16:00] <m1x10> Im receiving so many aprs messages from very far away
[16:00] <m1x10> more than 200km away
[16:00] <SpeedEvil> :)
[16:01] <fsphil> what frequency?
[16:03] <m1x10> 144.8
[16:04] <fsphil> nice range
[16:04] <m1x10> Now Im gonna try the new 100mw module
[16:09] <fsphil> for doing 2.4ghz from a balloon: http://www.maplin.co.uk/Module.aspx?ModuleNo=48743 :)
[16:09] <SpeedEvil> I was looking at free samples of 2.4GHz 100W transistors yesterday.
[16:10] <SpeedEvil> I decided I was unlikely to use them.
[16:10] <fsphil> yea
[16:10] <SpeedEvil> I got a couple of 1.2m ones from aldi for a tenner
[16:10] <fsphil> lidl occasionally have the camping sat kits in, but nothing bigger so far
[16:11] <SpeedEvil> I was planning on using them for an 80.211a link to my UAV
[16:12] <m1x10> lol
[16:12] <m1x10> that is heavy
[16:12] <SpeedEvil> On the bottom end only
[16:12] <fsphil> could combine a few smaller ones into an array
[16:12] <SpeedEvil> yeah
[16:12] <fsphil> though that big one comes in segments, wouldn't be too difficult to transport
[16:13] <SpeedEvil> Repurpose existing structures
[16:13] <SpeedEvil> http://www.nasa.gov/multimedia/isslivestream.asx
[16:13] <SpeedEvil> err
[16:13] <fsphil> and it could also be used for eme stuff
[16:13] <SpeedEvil> http://www.flickr.com/photos/lukemedway_uk/4996757633/in/pool-780291@N22/lightbox/
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[16:15] <fsphil> Outside armagh planetarium, there's a field beside the car park with two dishes at either end, pointed at each other. a good 40m between them
[16:15] Nick change: StrayVol1age -> StrayVoltage
[16:16] <fsphil> two people standing in front of each dish can hear the other -- even if they whisper
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[16:38] <m1x10> mhhhhh
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[16:39] <m1x10> 100mw module dont work again
[16:39] <m1x10> i have receiver and transmitter in 1 meter distance
[16:46] <fsphil> ooh, maplin have the energizer lithium batteries for £7
[16:48] <fsphil> and buy one get one gree
[16:48] <fsphil> free
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[17:04] <Laurenceb_> Upuwork: nice
[17:04] <Laurenceb_> thats the cheapest ive seen
[17:06] <Laurenceb_> http://i.imgur.com/pngTN.png <- eek
[17:06] <Laurenceb_> avoid st accels with no listed noise specs
[17:09] <SpeedEvil> yeah
[17:10] <SpeedEvil> Assume the datasheet is marginally telling the truth in the worst way
[17:10] <SpeedEvil> What is ug/sqrt(Hz)
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[17:11] <Laurenceb_> 10000
[17:11] <SpeedEvil> ow
[17:12] <Laurenceb_> looks like they bin the bad ones and fit 8 bit adc and "motion processing"
[17:12] <Laurenceb_> it can spit out orientation and gestures
[17:13] <Laurenceb_> but that only takes rough accel data
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[17:17] <Laurenceb_> current best from ST is now 30uG/sqrt(Hz)
[17:19] <SpeedEvil> that is good!
[17:19] <SpeedEvil> Specced, or measured?
[17:19] <Laurenceb_> specced
[17:20] <Laurenceb_> actually lsm302dl is more like 2800uG/sqrt(Hz)
[17:21] <Laurenceb_> theoretically 30uG position solution would drift <10m after 20minutes
[17:26] <SpeedEvil> yeah - though drift...
[17:27] <SpeedEvil> directly measuring gravity gradient would be lovely for orientation
[17:27] <SpeedEvil> 30ug/sqrt(hz) gets you - what ~300m altitude @1hz
[17:27] <SpeedEvil> Only another factor of 1000 before it's interesting in some apps
[17:27] <Laurenceb_> heh
[17:28] <Laurenceb_> have AD massively reduced the number of accels they stock?
[17:28] <SpeedEvil> not looked recently
[17:28] <Laurenceb_> i can find <20
[17:28] <SpeedEvil> they did have a hell of a lot of old ones
[17:29] <SpeedEvil> Also
[17:29] <Laurenceb_> looks like maybe they have decided to go with low volume high spec stuff due to ST
[17:29] <SpeedEvil> http://analog.com/
[17:29] <SpeedEvil> <stab>
[17:29] <Laurenceb_> bet a lot of people are _very_ annoyed if they really have discontinued that much stuff
[17:30] <SpeedEvil> yeah.
[17:30] <SpeedEvil> I vaguely recall a large number of adxl1* parts
[17:30] <SpeedEvil> and there is one now
[17:30] <Laurenceb_> yeah i reacon they have discontinued ~100 parts
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[17:30] <Laurenceb_> crazy
[17:31] <SpeedEvil> They seem to have dumped most of their 1-axis, and analog parts
[17:31] <Laurenceb_> in fact i think the ones on badger 2 have gone
[17:32] <Laurenceb_> guess they couldnt compete for high volume
[17:33] <SpeedEvil> http://search.analog.com/search/default.aspx?query=accelerometer&local=en
[17:33] <SpeedEvil> search for accellerometer obsolete
[17:34] <SpeedEvil> accellerometer obsolete
[17:34] <SpeedEvil> then 'product pages'
[17:34] <SpeedEvil> 377
[17:34] <Laurenceb_> wow
[17:35] <Laurenceb_> bet thats screwed a lot of device manufacturers/board designers about
[17:35] <SpeedEvil> Wow
[17:35] <SpeedEvil> Versus _59_ active ones
[17:40] <Laurenceb_> whats the proper name for the 3pin 230Vac connectors?
[17:40] <SpeedEvil> IEC?
[17:41] <SpeedEvil> The 'kettle' ones?
[17:41] <SpeedEvil> http://en.wikipedia.org/wiki/IEC_connector
[17:41] <Laurenceb_> ah thats it
[17:41] <Laurenceb_> need one for the reflow oven im making
[17:42] <Laurenceb_> i can probably find a panel mounting connector somewhere....
[17:42] <Laurenceb_> is it sensible to use some sort of interference supressor as itll be pwmed?
[17:42] Action: SpeedEvil looks at his modded casette connector, into a 3-lobed connector
[17:43] <SpeedEvil> hacksaw down the middle of the connector, fill gap with hot-melt, add tape.
[17:43] <Laurenceb_> lol
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[18:01] <fsphil> I Hate Maplin
[18:02] <fsphil> or their website at least
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[18:18] <Laurenceb_> guess ill get this - http://uk.farnell.com/bulgin/bzm27-z0000-55b/inlet-iec-switched-red/dp/9997180
[18:18] <Laurenceb_> nice and cheap at least
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[18:24] <jcoxon> evening all
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[18:31] <fsphil> ullo
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[18:34] Action: SpeedEvil sighs.
[18:34] <SpeedEvil> I've got a box of 100 of those somewhere
[18:34] <SpeedEvil> With input filters
[18:34] <SpeedEvil> no idea where though
[18:35] <Laurenceb_> not sure if filters are needed
[18:35] <Laurenceb_> as the optocouple has edge triggering
[18:35] <Laurenceb_> *ptocoupler
[18:36] <SpeedEvil> It depends.
[18:36] <SpeedEvil> The load you are switching is very, very benign with zero crossing triggering
[18:36] <SpeedEvil> Worst-case ~20V or so transient - which will be what - 100mA?
[18:37] <SpeedEvil> More common will be something like 3V
[18:37] <Laurenceb_> yeah
[18:37] <SpeedEvil> I was just annoyed at the piles of poorly organised stuff I have here.
[18:38] <Laurenceb_> oh you mean for filtering noise from outside getting in?
[18:38] <SpeedEvil> no - I was just saying I've got a box of them somewhere
[18:38] <Laurenceb_> i was thinking the other way around
[18:38] <SpeedEvil> nothing more
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[18:38] <Laurenceb_> ok
[18:38] <SpeedEvil> I'd put a couple of caps across L and N just for general principles
[18:39] <Laurenceb_> between them?
[18:39] <SpeedEvil> What's the total - 300w?
[18:39] <SpeedEvil> yes
[18:39] <Laurenceb_> either 300 or 600
[18:39] <Laurenceb_> W
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[18:43] <MrCraig> *tips hat to the channel
[18:44] <SpeedEvil> hey
[18:44] Action: SpeedEvil tips cow to channel.
[18:45] <jcoxon> evening MrCraig
[18:47] Action: natrium42 tips SpeedEvil
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[18:48] <jcoxon> natrium42, enjoy tron legacy?
[18:48] <natrium42> the costume and scene designs were awesome, not much of a script though
[18:48] <jcoxon> i agree
[18:48] <jcoxon> soundtrack was good
[18:48] <natrium42> also daft punk ftw
[18:48] <jcoxon> yup
[18:49] <natrium42> but the movie had no soul, i never felt anything
[18:49] <fsphil> was listening to the soundtrack today -- very good stuff
[18:49] <jcoxon> i was wrapt up in the image
[18:49] <jcoxon> didn't really care for the storyline
[18:49] <natrium42> :)
[18:49] <jcoxon> i want a lightcycle
[18:49] <natrium42> somebody was building one, i think i saw it on hackaday
[18:50] <natrium42> http://autos.sympatico.ca/weird-automotive-news/7086/video-brothers-build-working-tron-lightcycle
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[18:53] <jcoxon> hehe
[18:53] <jcoxon> natrium42, zp launch soon...
[18:53] <jcoxon> latest build of dl-fldigi has rig control :-)
[18:53] <jcoxon> and frequency tracking
[18:53] <natrium42> oh, excellent
[18:54] Action: natrium42 really need a better antenna though....
[18:54] <jcoxon> balloon suspended 40m yagi?
[18:55] <natrium42> can't do that from home though, other houses are too close
[18:55] <natrium42> and it's too cold to do it in some field
[18:56] <natrium42> we will be rocking the internet radios, though, right? :)
[18:56] <jcoxon> hell yeah
[18:56] <jcoxon> global tuners where we come
[18:56] <jcoxon> also i'll package up my web based dl-fldigi package
[18:56] <natrium42> i finally figured out how to virtually capture audio in windows 7
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[18:57] <jcoxon> as in pipe it back into a decoder?
[18:57] <natrium42> yes
[18:57] <jcoxon> on osx soundflower is awesome for that
[18:58] <natrium42> ah, cool, might give it a try
[18:58] <jcoxon> basically makes a loopback soundcard
[18:58] <jcoxon> so you just change the macs output soundcard to soundflower and then change the input soundcard on dl-fldigi
[18:58] <natrium42> i was booting my mac to win7 :P
[18:58] <jcoxon> and voila
[18:58] <jcoxon> yuk
[18:58] <fsphil> euu
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[19:30] <Laurenceb_> are cooking sieves made with a single sheet of woven stainless mesh?
[19:30] Action: Laurenceb_ doesnt have one to look at
[19:31] <SpeedEvil> yes
[19:32] <Laurenceb_> hmm they must use some weird weaving technique
[19:32] <SpeedEvil> I'm unsure
[19:32] <Laurenceb_> unless it starts out as a flat peice
[19:32] <SpeedEvil> I dunno if they are deformed
[19:32] <Laurenceb_> yeah
[19:32] <Laurenceb_> http://www.amazon.co.uk/Sieves-Sifter-9-25-Guaranteed-quality/dp/B003007XPW/ref=sr_1_4?s=kitchen&ie=UTF8&qid=1293651035&sr=1-4
[19:33] <Laurenceb_> guess thats suitable - for supporting the pcb
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[19:34] <Laurenceb_> guess ill see what can be had cheap from local shops/tip
[19:35] <Laurenceb_> do _not_ search for mesh on ebay
[19:36] <SpeedEvil> :)
[19:37] <Laurenceb_> http://cgi.ebay.co.uk/Stainless-Steel-Woven-Wire-Mesh-filter-grading-sieve-/260712773637?pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=item3cb3b13805
[19:37] <Laurenceb_> mor elike it
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[19:58] <Laurenceb_> http://www.inoxia.co.uk/rw/category/12.aspx <-ooh
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[20:00] <SpeedEvil> Interesting
[20:03] <Laurenceb_> the scales are nice too
[20:04] <Laurenceb_> their ebay store is slightly cheaper tho
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[20:15] <Laurenceb_> hmf total cost for the oven is not ~£100 :(
[20:15] <Laurenceb_> *now
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[20:36] <Laurenceb_> http://web.interware.hu/lekovacs/reflow_oven/index.html
[20:40] <Laurenceb_> versus http://cgi.ebay.co.uk/T-962-INFRARED-IC-HEATER-REFLOW-WAVE-OVEN-BGA-T962_W0QQitemZ390258981894QQcategoryZ109556QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DDLSL%252BSIC%26its%3DI%26itu%3DUCI%252BIA%252BUA%252BIEW%252BFICS%252BUFI%252BDDSIC%26otn%3D8%26pmod%3D180432783304%252B180432783304%26po%3D%26ps%3D63%26clkid%3D5998136470265266836
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[20:53] <Lunar_Lander> hello
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[20:55] <Lunar_Lander> how's life?
[20:57] Action: m1x10 prepares his stuff for army. Tomorrow 07:00.
[20:57] <Lunar_Lander> ah
[20:57] <Hiena> m1x10, going to deployment?
[20:59] <m1x10> what do u mean?
[21:02] <Hiena> You wrote, you prepares your stuff for army. Are you in the green or you meant other army?
[21:03] <m1x10> Normy army
[21:03] <m1x10> normal
[21:03] <m1x10> war army
[21:05] <Hiena> Which division, if i may to ask?
[21:07] <m1x10> what do u mean division?
[21:07] <m1x10> sorry but i dont understand these words
[21:08] <m1x10> Artillery, if this is what u mean.
[21:09] <m1x10> thats me in a recent guarding duty: http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs1188.snc4/151065_1511949483509_1377549819_1223462_3443505_n.jpg
[21:11] <m1x10> Cu all !
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[21:23] <SpeedEvil> Racetrack Memory, Spin Injectors, Magnetic Tunnel Transistors, and a host of more exotic spintronic designs take us beyond the realm of the simple GMR spinvalve.
[21:23] <SpeedEvil> That is star-trek quality babble
[21:23] <Lunar_Lander> yeah
[21:23] <SpeedEvil> http://www.almaden.ibm.com/spinaps/research/sd/?racetrack
[21:25] <Lunar_Lander> Ariane Flight number 199 in less than 2 minutes
[21:27] <SpeedEvil> Woo - stream live at 0:08
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[21:37] <SpeedEvil> 'speed is 7km/h' - wow - orbit is slower than I thought.
[21:37] <SpeedEvil> Or maybe the french just take a more laid-back attitude.
[21:38] <Lunar_Lander> lol
[21:41] <Lunar_Lander> Ascension has tracking
[21:47] <Lunar_Lander> Libreville has tracking
[21:48] <fsphil> is there a rocket launch now?
[21:48] <Lunar_Lander> yes
[21:48] <Lunar_Lander> http://www.videocorner.tv/videocorner2/live_flv/index.php?langue=en
[21:49] <SpeedEvil> It's not by anyone here though.
[21:49] <Lunar_Lander> yeah
[21:50] <Lunar_Lander> Spain-South Korea
[21:50] <russss> really these unmanned launches are only boring if they blow up
[21:50] <russss> and Ariane as a whole has a good enough record for me not to care
[21:50] <Lunar_Lander> Malindi has tracking
[21:51] <SpeedEvil> And they are very much a 80s design
[21:51] <Lunar_Lander> yeah
[21:51] <Lunar_Lander> but the boosters have been made better than the STS ones
[21:52] <SpeedEvil> Sure.
[21:53] <russss> they're launching the next ATV to the ISS in February, that's a nifty little spacecraft.
[21:53] <Lunar_Lander> yeah
[21:53] <Lunar_Lander> and it is the 200th ariane
[21:54] <SpeedEvil> They're not really interesting for me, as they have very modest goals.
[21:58] <stilldavid> phew, I'm on a spending spree
[21:59] <stilldavid> just got the solenoid valve that zuph recommended for ballast control and the radiometrix radio for the APRS beacon
[22:00] <Lunar_Lander> 2000 km
[22:01] <Lunar_Lander> end of mission!
[22:02] Action: SpeedEvil edits Arianes page on wikipedia to reflect launch success.
[22:03] <Lunar_Lander> yay
[22:04] <fsphil> spending sprees are always fun
[22:06] <jcoxon> hey stilldavid so starting your zp project?
[22:06] <stilldavid> jcoxon, it's sort-of officially started now
[22:06] <Lunar_Lander> hi jcoxon
[22:06] <fsphil> sweet
[22:06] <jcoxon> awesome - shout if you want any help
[22:06] <fsphil> good luck!
[22:06] <stilldavid> going to start putting together the flight control system
[22:07] <stilldavid> jcoxon, you know I sure will. I've been thinking a lot about flight behavior...
[22:07] <stilldavid> when to drop ballast, etc...
[22:07] <jcoxon> good info here: http://spacenear.us/wiki/doku.php
[22:07] <jcoxon> i personally think a peristaltic pump will perform better then just a solenoid valve
[22:08] <jcoxon> and allows you to be quite accurate
[22:08] <stilldavid> definitely following halo as well as the white star guys; I'm on their mailing list and have been poking around some
[22:08] <Lunar_Lander> jcoxon - "Programs for calculating various factors with ZP balloons" doesn't work
[22:08] <jcoxon> it worked for me
[22:08] <stilldavid> jcoxon, I just want to play with the pumps, I haven't decided on a ballast system yet.
[22:09] <Lunar_Lander> what programs are on that link?
[22:10] <jcoxon> once i've fully flight tested my new flight computer i'll get on do another ballasthalo
[22:10] <fsphil> could a heavy gas be used as a ballast? stored in a second balloon, and just released as necessary
[22:10] <Lunar_Lander> http://mysite.verizon.net/milkyway99/id4.html
[22:10] <Lunar_Lander> gets me a 404
[22:10] <jcoxon> Lunar_Lander, oh right
[22:11] <jcoxon> i thought you meant the program didnt work
[22:11] <jcoxon> rather than the link
[22:11] <Lunar_Lander> yeah
[22:11] <Lunar_Lander> what does that program do?
[22:11] <jcoxon> exactly what it says
[22:12] <jcoxon> freezer test time
[22:12] <Lunar_Lander> is there a way to get the program?
[22:13] <jcoxon> i'll have to go searching
[22:13] <jcoxon> follow the freezer test here: http://m6jcx.no-ip.org/dl-fldigi-XMLRPC/index.html
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[22:18] <stilldavid> so on radiometrix modules, what does the last number mean? eg: NTX2-434.650-10
[22:18] <stilldavid> the 10 above
[22:18] <jcoxon> 10mw
[22:18] <Lunar_Lander> http://img406.imageshack.us/img406/6416/endofmission.png
[22:19] <stilldavid> so a 3 would be 300mw?
[22:19] Nick change: SpeedEvil1 -> SpeedEvil
[22:19] <jcoxon> don't think there is an ntx2 that does 300mW
[22:19] <stilldavid> I'm looking at the HX1 on 144.39
[22:20] <stilldavid> and just got an email from the US supplier asking which I want.
[22:20] <stilldavid> don't want to get the wrong one... I didn't think the HX1 came in a 10mw version though
[22:29] <jcoxon> hmmm my baud rate timing must be off
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[22:36] <stilldavid> jcoxon, we just got these in: http://www.sparkfun.com/products/10221
[22:36] <stilldavid> think I'm going to get one and play with it a bit.
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[22:37] <jcoxon> yes i saw that
[22:37] <jcoxon> laurence built one from scratch
[22:37] <stilldavid> maybe get two and average them over time or something?
[22:37] <jcoxon> oh wait
[22:37] <jcoxon> this is different
[22:37] <stilldavid> yeah, this is a single piece
[22:37] <jcoxon> cool
[22:37] <jcoxon> i tried with floats etc
[22:37] <jcoxon> just didn't work
[22:37] <stilldavid> yeah, I'm curious how it does in a swinging payload
[22:38] <Laurenceb_> its tricky to do level sensing
[22:38] <jcoxon> right freezer test take 2
[22:38] <Laurenceb_> i got it kind of working with a capacitive sensor
[22:38] <jcoxon> hence my dead reckoning with peristaltic pump
[22:38] <stilldavid> is there a pump you had in mind?
[22:38] <Laurenceb_> but capillary effects were screwing it up
[22:38] <jcoxon> well i've been working with williamson pumps
[22:39] <Laurenceb_> i use 2mm brass pipe with two insulated wires down the middle - twisted pair
[22:39] <jcoxon> http://www.williamson-shop.co.uk/100-series-with-dc-powered-motors-3586-p.asp
[22:39] <jcoxon> i plan to make them lighter
[22:39] <Laurenceb_> then measure the capacitance, but capillary effects and also broplets got stuck inside it
[22:39] <stilldavid> oh, that looks like it might just work
[22:39] <Laurenceb_> it needs to be slightly larger diameter to work
[22:39] <stilldavid> the ones I've seen are much bukier
[22:39] <jcoxon> thats what i've been working with on ballasthalo
[22:39] <Laurenceb_> maybe 3 or 4 mm diameter
[22:42] <jcoxon> stilldavid, its got some metal attachements that can be replaced with something more lightweight
[22:42] <Laurenceb_> http://www.sparkfun.com/products/7918
[22:42] <Laurenceb_> that sensor ic
[22:42] <jcoxon> also photodiode and interrupter doesn't work as teh photodiode got too cold
[22:42] <jcoxon> so i'm thinking microswitch or hall sensor
[22:43] <stilldavid> well, keep the wiki updated :)
[22:43] <jcoxon> all the ballasthalo stuff is on my website
[22:43] <SpeedEvil> I like self-heating sensors
[22:43] <SpeedEvil> but power is an issue
[22:44] <SpeedEvil> leetle thermistor with a small voltage across it
[22:44] <stilldavid> yeah, along the lines of power... I see a lot of 12v stuff floating around
[22:44] <stilldavid> radios, solenoids, etc...
[22:44] <stilldavid> I can't imagine having a 12v rail though
[22:44] <jcoxon> SpeedEvil, thats a good idea
[22:44] <Laurenceb_> personally id try a more sensible capacitive level sensor and valve
[22:44] <Laurenceb_> as lighter
[22:44] <jcoxon> ping fsphil
[22:45] <fsphil> pong jcoxon
[22:46] <jcoxon> hehe your freq control is great
[22:47] <jcoxon> until it retunes mid string :-p
[22:47] <fsphil> haha, yea can't be avoided :)
[22:47] <jcoxon> could we not have it retune if its decoding a string?
[22:47] <Laurenceb_> ooh good idea
[22:47] <fsphil> well it would be trivial to set a flag, and block the auto tune
[22:47] <Laurenceb_> theres the same issue with the sdr
[22:47] <fsphil> as soon as the flag is unset, it should happen instantly
[22:48] <jcoxon> just a thought :-)
[22:48] <jcoxon> doesn't matter on 100% duty flights
[22:48] <jcoxon> but if you are waiting for a while between strings...
[22:48] <fsphil> one issue could be a strong drift between strings
[22:48] <fsphil> fldigi might drift away during the idle time
[22:48] <jcoxon> yeah
[22:49] <fsphil> might be useful to send out null characters from an interrupt or something
[22:50] Nick change: Nigey -> Nigey|Away
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[22:53] <Laurenceb_> http://www.sparkfun.com/products/9695
[22:55] <Laurenceb_> another level sensor
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[23:06] <jcoxon> interestingly the atmega328 has an internal temp sensor
[23:06] <jcoxon> well sort of:
[23:06] <jcoxon> http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238764842
[23:07] <Laurenceb_> can you acess rssi over xmrpc?
[23:07] <Laurenceb_> from fldigi
[23:07] <fsphil> that's cool
[23:07] <fsphil> I must see if the 644 has it
[23:08] <jcoxon> it doesn't
[23:08] <Lunar_Lander> jcoxon did you find the program?
[23:08] <fsphil> aww :p
[23:08] <jcoxon> Lunar_Lander, haven't looked
[23:08] <Lunar_Lander> ah np
[23:09] <Laurenceb_> main.get_squelch <-bingo
[23:09] <Laurenceb_> use that to determine when there no data
[23:09] <Laurenceb_> then retune as necessary
[23:09] <Laurenceb_> ill add that to the sdr code
[23:10] <Laurenceb_> <jcoxon> could we not have it retune if its decoding a string?
[23:13] <SpeedEvil> squelch will only be active if there is no signal at all
[23:13] <SpeedEvil> and that's not the case if you're barely above the noise
[23:13] <Laurenceb_> true
[23:14] <Laurenceb_> but its a good start
[23:15] <fsphil> jcoxon, pushed a commit to lock while extracting -- untested
[23:19] <jcoxon> fsphil, okay - my drift has stablised as my PID has kicked in
[23:19] <jcoxon> will test it tomorrow when i run this freezer test again
[23:22] <jcoxon> hmmm i have to put my decoding lines off the main peaks to get a clean decode
[23:22] <jcoxon> is that a timing issue?
[23:23] <fsphil> does hitting Rv twice sometimes get it decoding?
[23:23] <jcoxon> sort of
[23:26] <fsphil> i've seen it decode entire strings wrong, but then start working on the next one
[23:27] <jcoxon> i think i may have messed up my filters
[23:28] <jcoxon> also i'll switch to 2 stop bits
[23:28] <fsphil> yea, fldigi seems a bit weak with short stop bits
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[00:00] --- Thu Dec 30 2010