highaltitude.log.20110503

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[00:06] Action: hibby says ooooh as he makes the connection between shorting bars on the antennas and folded dipoles
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[05:13] <griffonbot> @CollegeARC: @m_d_o_o Also, if u wanna see another src of stress (good!) just look at the @ARRL website :D #hamr #ARHAB [http://twitter.com/CollegeARC/status/65282748180475905]
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[05:46] <griffonbot> @Hamradio_Ticker: RT @CollegeARC: @m_d_o_o Also, if u wanna see another src of stress (good!) just look at the @ARRL website :D #hamr #ARHAB [http://twitter.com/Hamradio_Ticker/status/65291213124796416]
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[08:42] Action: griffonbot is GriffonBot [http://github.com/ssb/griffonbot]
[08:42] Action: griffonbot is following: #arhab #ukhas #cusf #atlasballoon
[08:42] Action: griffonbot is tracking emails sent to ukhas@googlegroups.com
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[08:58] <SamSilver> bbl
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[09:02] <SpeedEvil> http://www.csmonitor.com/Science/2011/0429/Cracker-size-satellites-to-launch-with-Space-Shuttle-Endeavour
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[09:15] <SpeedEvil> Intriguingly, since these satellites are so tiny, atmospheric drag would quickly decelerate them to speeds less than the speed of sound. This slow re-entry means they effectively would flutter all the way down, avoiding the friction that spectacularly turns larger meteoroids into shooting stars.
[09:15] <SpeedEvil> Sounds like buill
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[09:27] <mattltm-alt> Morning :)
[09:27] <SpeedEvil> http://www.theonion.com/articles/chrysler-introduces-new-midsized-sedan-for-inhome,20295/?utm_source=recentnews
[09:27] <SpeedEvil> :)
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[09:33] <Lunar_Lander> hello
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[09:38] <Lunar_Lander> hello cuddykid
[09:47] <Laurenceb_> http://svn.openpilot.org/browse/~raw,r=8aef51545636d29fd4fdfe2594bcabeb50a199e2/OpenPilot/flight/Libraries/WorldMagModel.c
[09:48] <Laurenceb_> openpilot is so freaking awesome
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[09:49] <Laurenceb_> - chuck in lat,long, altitude, date and it chucks out the B field
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[09:50] <Lunar_Lander> cool
[09:50] <hibby> Done :)
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[10:04] <NigeyS> moooorning
[10:06] <jonsowman> morning NigeyS
[10:07] <NigeyS> morning jon :-)
[10:07] <NigeyS> bit windy out !
[10:07] <jonsowman> it's quite nice here today
[10:07] <jonsowman> bit on the cold side
[10:08] <Laurenceb_> anyone here used inkscape?
[10:08] <NigeyS> definately not as warm as it has been :(
[10:09] <NigeyS> Laurenceb_, not i .. what is it? :|
[10:09] <Laurenceb_> vector graphics editor
[10:09] <NigeyS> ooo
[10:09] <Laurenceb_> i have an issue with eps export
[10:10] <Laurenceb_> its screwing up the left hand side board size and wont print
[10:12] <NigeyS> sledgehammer time ?
[10:12] <Laurenceb_> im getting pretty mad
[10:14] <NigeyS> understandable
[10:14] <Laurenceb_> seems its cropping to the objects when it exports
[10:15] <Laurenceb_> maybe if i make some fake 0xFFFFFF objects...
[10:16] <NigeyS> worth a shot, but its probably a really silly setting hidden somewhere
[10:17] <NigeyS> aww look .. hab ready hedgehogs .. lol ... http://news.bbc.co.uk/earth/hi/earth_news/newsid_9469000/9469456.stm
[10:18] <jonsowman> hahaha
[10:18] <NigeyS> all they need is a balloon and a parachute lmao
[10:19] <mattltm-alt> Hahaha!
[10:20] <fsphil> "That's one giant leap, for hog-kind"
[10:21] <mattltm-alt> I may conduct a study into the migratory patterns of african swallows. Who wants to give me a load of cash to build some GPS trackers?
[10:22] <GW8RAK> Memories of Not the Nine O'Clock News getting complaints over their treatment of hedgehogs
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[10:25] <NigeyS> lol
[10:26] <GW8RAK> Okay, technical/safety question. I'm working on an azimuth/elevation rotator I got cheaply, but unfortunately, it is mains powered. Rotation speed is a bit fast, but not impossible to control, but what safety measures would people suggest for running mains outside? Isolation transformers, RCD's, fuses, armoured cable etc?
[10:28] <SpeedEvil> RCD is good.
[10:28] <SpeedEvil> How far outside?
[10:28] <SpeedEvil> Also - what sort of motors?
[10:28] <GW8RAK> Probably 20m or so.
[10:28] <SpeedEvil> I'm not uncoincidentally trying to unjam a variac that hasn't moved in 20 years
[10:28] <GW8RAK> Motors - unknown until I get home tonight. Can't remember manufactuers, but they are current parts.
[10:29] <SpeedEvil> Armoured is not needed if the cable is protected.
[10:29] <SpeedEvil> Normal cable is UV sensitive
[10:29] <SpeedEvil> Fuse appropriately.
[10:29] <GW8RAK> Hopefully I can get away with stop start control on it's own and not worry about speed control.
[10:29] <SpeedEvil> And use a RCD
[10:30] <GW8RAK> If I can get a tree cut down, then it can go on the end of the outbuilding and won't have much exposed wire
[10:30] <SpeedEvil> I meant if it was running with universal (Ireversible) motors, then it will probably happily run at 110v with lower speed
[10:30] <GW8RAK> Not irreversible motors though.
[10:31] <GW8RAK> I know there are different kinds of AC motor, but I got lost in AC theory at University.
[10:31] <SpeedEvil> reversable
[10:31] <SpeedEvil> that was a type
[10:31] <GW8RAK> Okay, they can be reversed. Does that tell you the type that they are?
[10:31] <SpeedEvil> most universal motors - with field coils and rotor coils - are not reversable - but it's easy to do if the firld coil is wireable backwards
[10:32] <SpeedEvil> Do they run directly from the mains?
[10:32] <SpeedEvil> Or is there a seperate heavy PSU
[10:32] <GW8RAK> There are 3 wires to each motor, neutral, and clockwise supply and anticlockwise supply.
[10:32] <GW8RAK> they do run directly from the mains
[10:32] <GW8RAK> Huge amounts of torque
[10:59] <NigeyS> hmm
[11:02] <griffonbot> Received email: Neil Baker "Re: [UKHAS] Re: Help with choice of payload single chip computers"
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[11:04] <MNSP> hello all :)
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[11:07] <NigeyS> hey MNSP , BrainDamage :)
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[11:08] <BrainDamage> hiho
[11:12] <MNSP> alright braindamage?
[11:13] <BrainDamage> yeah, just struggling with post-distro-upgrade squibbles
[11:20] <MNSP> lol, I suppose theres worse thing you could struggle with
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[12:27] <W0OTM> Hello WOrld
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[12:46] <fsphil> yo yo
[12:47] <jonsowman> afternoon #highaltitude
[12:49] <mattltm-alt> fsphil?
[12:49] <fsphil> hiya mattltm-alt
[12:50] <NigeyS> \o/ woooooooo
[12:50] Action: NigeyS hyper :|
[12:51] <fsphil> lol
[12:51] <NigeyS> Paul Oakenfold - Gatecrasher 1999 \o/\o|\o/|o|\o/
[12:52] <NigeyS> i wanna be 21 again :(
[12:52] <mattltm-alt> fsphil: Take a look here... http://www.mattltm.co.uk/sstv-images/
[12:52] <mattltm-alt> MMSSTV and DM780 running side by side from the rame radio :(
[12:53] <fsphil> ooh arr
[12:54] <fsphil> I'll give DM780 a try tonight, see how it compares here
[12:56] <fsphil> are you running all the default options?
[12:58] <NigeyS> phil
[12:58] <NigeyS> that c/w is still there :|
[12:58] <W0OTM> how do I use the lookup?
[12:58] <W0OTM> the qrz lookup bot
[12:58] <W0OTM> oops
[12:58] <NigeyS> ello W0OTM :)
[12:59] <W0OTM> wrong window
[12:59] <W0OTM> sry
[12:59] <fsphil> NigeyS, def. local.
[12:59] <W0OTM> NigeyS: hiya
[12:59] <NigeyS> yup, james was convinced it was c/w but fdigi wont decode
[12:59] <fsphil> doesn't sound like c/w to me - there's too much going on
[13:00] <NigeyS> did you see the waterfall pic i took? its like .. theres 3 seperate signals all evenly spaced .. very odd
[13:06] <W0OTM> can someone edit the uhkas wiki for me?
[13:06] <jonsowman> W0OTM: sign up for an account and edit it yourself :)
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[13:10] <SpeedEvil> I can edit the wiki for a modest fee.
[13:10] <NigeyS> lol
[13:10] <mattltm-alt> Ok, so the HX1 from radiometrix...
[13:10] <mattltm-alt> On 144.800 for an APRS beacon...
[13:11] <mattltm-alt> They do 2 versions the 144.800-3 or the 144.800-10. Whats the diferance?
[13:11] <Laurenceb_> http://svn.openpilot.org/browse/~raw,r=876ca3044c1746ea52b7704c3e585cd5f5351171/OpenPilot/flight/INS/insgps13state.c
[13:11] <Laurenceb_> its so freaking good
[13:11] <jonsowman> mattltm-alt: are you in the UK?
[13:11] <Laurenceb_> theyve added runge kutta to the predict step
[13:12] <mattltm-alt> Yes.
[13:12] <griffonbot> Received email: Upuaut "Re: [UKHAS] Re: Help with choice of payload single chip computers"
[13:12] <SpeedEvil> I undersrtoiod about half the words in that last sentance.
[13:13] <SpeedEvil> RK is a means of solving linear equations?
[13:13] <SpeedEvil> I forget
[13:13] <Laurenceb_> yeah
[13:13] <jonsowman> mattltm-alt: you know that amateur bands aren't permitted for airborne us in the UK?
[13:14] <mattltm-alt> Yes, its not for arbourne use, just for a simple ground based APRS station.
[13:14] <jonsowman> ok, just checking :)
[13:14] <mattltm-alt> No probs :) I'm just trying to work out the diferances between the -3 and the -10 version.
[13:16] <jonsowman> I can only see the HX1-...-3 version
[13:16] <Laurenceb_> SpeedEvil: i think its effectively like running the whole ekf a lot faster
[13:16] <Laurenceb_> makes it mor elinear
[13:17] <NigeyS> hmm they do a 10mw on 173 aswell
[13:17] <NigeyS> duty cycle limit i guess ?
[13:17] <SpeedEvil> Sort of like making a best guess when successively approximating in the first step can speed things up vastly.
[13:18] <mattltm-alt> Ah, -10 is a diferent pin out.
[13:18] <mattltm-alt> Jod done :)
[13:19] <mattltm-alt> bbl...
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[13:24] <Laurenceb_> http://2.bp.blogspot.com/-EsPKMzkTyOw/Tb48mm53wII/AAAAAAAABMk/UE9yBPtXeSw/s400/royal-wedding-funny.jpg
[13:25] <SpeedEvil> Saw rthat rearlier. :)
[13:25] <SpeedEvil> I also saw a variant.
[13:25] <Tiger^> there's also an animated version :>
[13:26] <SpeedEvil> With the female just to the left in the place of Kate, which was rather wronger.
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[13:27] <GW8RAK> Afternoon fsphil. With your SSVT from balloons, I wonder if you've come across this technique http://www.qsl.net/zl1bpu/NBTV/Index.htm
[13:27] <GW8RAK> SSTV
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[13:28] <SpeedEvil> http://opencores.org/donation - hmm - closing ok 10K
[13:29] <fsphil> GW8RAK, I have - it's still a bit slow
[13:29] <SpeedEvil> I donated a very little.
[13:29] <fsphil> there is a proper NBTV format though -- about 15fps
[13:29] <fsphil> very tiny frames though
[13:29] <GW8RAK> I came across the webpage this morning and thought I'd point it out to you.
[13:29] <GW8RAK> Like a lot of things, it solves one problem, but creates another
[13:30] <fsphil> transmitting that is the issue there -- it would have to be FM modulated
[13:30] <GW8RAK> Creates two problems then
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[13:31] <fsphil> although: http://www.qsl.net/zl1bpu/NBTV/Hybrid.htm
[13:32] <fsphil> should be quite possible with an ntx2
[13:32] <GW8RAK> Just looks interesting.
[13:33] <GW8RAK> Pictures of the balloon actually bursting?
[13:35] <fsphil> I think the little uart camera would be fast enough too
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[13:42] <fsphil> this is the nbtv I was thinking of: http://www.nbtv.org/
[13:46] <hibby> dissertation in \o/
[13:46] <fsphil> woo!
[13:46] <hibby> im going to go home now
[13:46] <hibby> 24 hours in uni is possibly a little too long
[13:47] <Elwell> hibby: good call on handin BTW
[13:47] <Elwell> (even if you are still a soapdodging slacker waster)
[13:47] <hibby> Elwell: how so?
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[14:08] <Guest98510> hi all
[14:09] <Guest98510> How do we get to us space near us website
[14:10] <Dan-K2VOL> hi gues
[14:10] <Dan-K2VOL> t
[14:10] <Dan-K2VOL> go to http://spacenear.us/tracker
[14:10] <Dan-K2VOL> Guest98510 ^
[14:12] <Guest98510> How do I go by putting in my tracking info?
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[14:19] <Kerrye> Ok lets try again . How do I get my predictions in spacenearus ?
[14:22] <Randomskk> predictions?
[14:23] <Kerrye> I would love to use that tracker, but not sure how to set it up for my launch this weekend ?
[14:24] <W0OTM> PENS launches in 30 min
[14:25] <W0OTM> http://www.pellaarc.com/Projects/EOSS/PENS.html
[14:25] <W0OTM> n0mpm-11
[14:26] <Randomskk> Kerrye: typically you have your payload transmit strings in a common format, and then use dl-fldigi to listen to it via your radio, then dl-fldigi uploads the points to the tracker
[14:28] <griffonbot> Received email: Oliver de Peyer Astrobiologist "[UKHAS] Looking for high altitude life, one flight under my belt but
[14:28] <griffonbot> Received email: chris.hembrow "Re: [UKHAS] Re: Help with choice of payload single chip computers"
[14:28] <Kerrye> ok thanks,, to late for that, we will use a cell phone as secondary and the Spot for primary thanks
[14:28] <SamSilver> when you launching Kerrye?
[14:30] <Kerrye> Saturday morning 0900 5/7/2011 from Cisco, Tx
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[14:36] <jcoxon> morning
[14:37] <fsphil> howdy jcoxon
[14:38] <NigeyS> ello James, on nights again ?
[14:38] <jcoxon> yup
[14:38] <jcoxon> 1 down 3 to go
[14:38] <NigeyS> ouch
[14:42] <W0OTM> Randomskk: does fl-digi support APRS?
[14:42] <Randomskk> don't think so
[14:42] <jcoxon> W0OTM, it doesn't support packet
[14:42] <fsphil> it doesn't
[14:42] <griffonbot> Received email: James Coxon "[UKHAS] Moderating"
[14:42] <jcoxon> therefore APRS
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[14:43] <fsphil> multimon can do packet, wouldn't be too difficult to have it push received data somewhere
[14:43] <W0OTM> APRS  (packet) is huge in the HAB community
[14:43] <Randomskk> jcoxon: I could moderate
[14:44] <fsphil> I don't have the go to launch this weekend, but still -- yikes: http://habhub.org/predict/#!/uuid=8470713de73ff0e0fdb3ef23e78603616af6f5f3
[14:45] <jcoxon> W0OTM, a packet modem in fldigi has been thrown about for a while by fldigi's normal dev team
[14:45] <jcoxon> but it seems nothing has come about
[14:47] <W0OTM> so spacenear.us is limited to the people who are NOT using APRS for telemetry
[14:48] <jcoxon> W0OTM, yes, however if you were to add a packetmodem to fldigi (its open source) it would work
[14:48] <jcoxon> we can't use hte aprs network here in the uk
[14:49] <jcoxon> and also aprs.fi etc works very well for aprs (in my opinion)
[14:49] <W0OTM> jcoxon: ahh, that makes more sense.
[14:49] <jcoxon> spacenear.us was designed for non-aprs telem as that was what was avaliable
[14:49] <W0OTM> yes, aprs.fi works great!
[14:49] <W0OTM> I have a addon script to the tracker code to poll the APRS network and import to the tracker database
[14:50] <cuddykid> hi all
[14:51] <cuddykid> what is roughly the required strength for the nylon cord? 50kg?
[14:51] <SpeedEvil> 50kg will rip the chute and balloon apart
[14:51] <SpeedEvil> So that'rs certainly overkill
[14:51] <SpeedEvil> I'd not want to go much below 10kg
[14:51] <SpeedEvil> Even 5kg should be fine though
[14:52] <cuddykid> oh right!
[14:52] <SpeedEvil> 5Kg with a 1Kg payload is quite a lot of accelleration
[14:53] <cuddykid> on Steves website (rsolutions) the min is 22.5kg, is that too much?
[14:56] <junderwood> cuddykid, allow plenty of margin for snatch loads.
[14:56] <junderwood> less important for Nylon. Vital for Kevlar
[14:56] <cuddykid> junderwood, what are snatch loads? sorry :P
[14:56] <junderwood> shock loads
[14:56] <cuddykid> ok
[14:56] <junderwood> going taut initially
[14:57] <cuddykid> gotcha!
[14:57] <junderwood> and absorbing energy due to relative motion of parachute and payload
[14:57] <Dan-K2VOL> cuddykid you've got to pay attention to the laws of your region, the international law says that the payload must separate from the balloon when a 230N force is applied to them
[14:58] <Dan-K2VOL> if you use a static weight on the planet earth (9.8m/s/s), 230N = 23.4kg
[14:59] <junderwood> Dan-K2VOL, do you have a reference for that law?
[14:59] <cuddykid> thanks Dan-K2VOL
[15:00] <Dan-K2VOL> yes, it's the ICAO rules of the air appendix, 4 I think, just a sec, it's referred to on the White Star wiki
[15:00] <cuddykid> just emailed a sewing company, see what they come back with!
[15:02] <jcoxon> cuddykid, braided cord is better then twisted
[15:03] <cuddykid> thanks
[15:03] <junderwood> Dan-K2VOL, thanks. Interesting
[15:05] <W0OTM> http://aprs.fi/?call=a%2FN0MPM-11
[15:05] <W0OTM> PENS about to launch
[15:05] <Dan-K2VOL> sorry cuddykid junderwood, it's ICAO International Standards Rules of the Air Annex 2, Appendix 4
[15:05] <Dan-K2VOL> http://www2.tech.purdue.edu/at/courses/at300/Documents/Annex2.pdf
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[15:05] <W0OTM> 3000g with 4 payloads
[15:08] <Dan-K2VOL> the ICAO text: "Unmanned free balloons shall be classified as& c) heavy: an unmanned free balloon which carries a payload which: 4)uses a rope or other device for suspension of the payload that requires an impact force of 230 N or more to separate the suspended payload from the balloon."
[15:08] <Dan-K2VOL> you don't want to be heavy
[15:08] <Dan-K2VOL> you want to be medium or light
[15:09] <Dan-K2VOL> there's a lot more restrictions for heavy
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[15:09] <jcoxon> cuddykid, for a simple launch i wouldn't get too stressed about it
[15:10] <Dan-K2VOL> yeah use what the rest of the groups around there use and you're unlikely to be the target of any investigations
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[15:10] <cuddykid> cool! :) thanks guys
[15:10] <Dan-K2VOL> W0OTM that's quite a heavy payload for a starter flight, is that really their first one?
[15:11] <W0OTM> yup
[15:11] <W0OTM> Dan-K2VOL: I wasn't involved (just for the record)
[15:11] <W0OTM> :)
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[15:13] <Dan-K2VOL> heh
[15:13] <Dan-K2VOL> well looks like they've done their homework anyway
[15:18] <m1x10> someone here suggested me farnell.com
[15:18] <m1x10> This eshop allows orders in UK only
[15:19] <SpeedEvil> gr.farnell.com
[15:19] <SpeedEvil> Is gr greece?
[15:19] <SpeedEvil> hmm
[15:20] <NigeyS> yeah speedy gr is greece
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[15:21] <m1x10> SpeedEvil: does not have for gr
[15:21] <m1x10> all eu countries are in except gr :p
[15:22] <m1x10> oh i did it
[15:22] <m1x10> cool but now it says i need to order above 20 pounds
[15:22] <m1x10> for use with debit cards
[15:23] <m1x10> :(
[15:23] <m1x10> SpeedEvil ru a brit?
[15:23] <NigeyS> W0OTM, 3000g balloon did you say? seems to be ascending fairly slowly
[15:24] <W0OTM> 800ft/min
[15:24] <W0OTM> yes, 3000g
[15:26] <W0OTM> now at 1000ft/min
[15:26] <NigeyS> meh whats that in meters ?
[15:26] <NigeyS> ft and inches confuse me !
[15:27] <NigeyS> jcoxon, that rf-link i bought seems to be running nicely on 3.3v did a LOS test earlier .. a good 250meters
[15:28] <griffonbot> Received email: Oliver de Peyer "Re: [UKHAS] Moderating"
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[15:33] <jonsowman> jcoxon: ping
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[15:45] <yannik> anyone online?
[15:45] <Kerrye> What is the most reliable prediction software thats being used ?
[15:46] <stilldavid> Kerrye: http://habhub.org/predict/ seems to do pretty well :)
[15:47] <Kerrye> Thanks still, I will give it a try
[15:47] <yannik> where does this program take its ressources from?
[15:47] <yannik> Wind speeds, etx.
[15:48] <stilldavid> have a read up here: http://www.srcf.ucam.org/~cuspaceflight/wiki/doku.php?id=prediction
[15:49] <yannik> okey, thanks !
[15:50] <Kerrye> I have been using CUSF and U of Wyoming Ballon track and boy are they different
[15:50] <stilldavid> oh yeah? even with the same inputs?
[15:50] <yannik> an other question, what does "Lat/Lon Deltas" mean?
[15:51] <stilldavid> I'm not entirely sure, but I'm sure someone around here does :)
[15:53] <SamSilver> bbl
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[15:53] <stilldavid> yannik: or, when in doubt: https://github.com/jonsowman/cusf-standalone-predictor
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[15:56] <yannik> thanks a lot stilldavid for your help!
[15:56] <W0OTM> [APEN via WIDE1-1,WIDE2-1,qAR,K0SUN-15]
[15:56] <W0OTM> thats wrong right?
[15:56] <jonsowman> that cusf wiki page is well out of date
[15:56] <W0OTM> WIDE1-1
[15:56] <stilldavid> definitely :) just pasting links, some of the other folks around here did all the hard work
[15:57] <jonsowman> i will write some docs for the new predictor at some point
[15:57] <jonsowman> I've been saying that for months though
[16:01] <yannik> I'm sorry for bothering you with all those questions, but is the GMT HD more accurate than just GMT ?
[16:01] <yannik> sorry.. GFS not GMT
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[16:03] <jonsowman> yannik: marginally
[16:04] <jonsowman> the difference it makes in terms of distance is well below the predictor's accuracy level anyway, even with accurate input parameters
[16:04] <Dan-K2VOL> W0OTM I think the GPSL email list might have more ppl knowledgable on APRS paths
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[16:04] <Dan-K2VOL> I can never remember the correct path, as we rarely fiddle with APRS
[16:04] <Dan-K2VOL> either slap on someone else's APRS payload or fly with other tracking methods
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[16:07] <Kerrye> Does any one know how much additional lift is required once the ballon and payload is neutral ? 1.5 lbs of lift or more ? for about 80-100k ?
[16:07] <jonsowman> Kerrye: http://www.cuspaceflight.co.uk/calc
[16:08] <Dan-K2VOL> jonsowman
[16:08] <Dan-K2VOL> do you maintain that?
[16:08] <jonsowman> Dan-K2VOL: Randomskk wrote it
[16:08] <jonsowman> it's based on the burst1a.xls spreadsheet that's floating around cusf/ukhas wikis
[16:08] <jonsowman> why?
[16:08] <Kerrye> We used that calculator on that link but it seems unrealistic on the neck lift.
[16:08] <Dan-K2VOL> gotcha, I was wondering if it could be modified to add the smaller Kaymont pilot balloons
[16:09] <jonsowman> Kerrye: what were your input parameters?
[16:09] <Dan-K2VOL> what did you enter Kerrye
[16:09] <Kerrye> If our balloon weighs 1200 grams, 1814 for the cargo, how much extra lift do we need?
[16:09] <jonsowman> Dan-K2VOL: there's potential, how small are they?
[16:09] <Dan-K2VOL> 10g, 20g, 30g 100g
[16:09] <Kerrye> We want to get to about 85,000'
[16:10] <jonsowman> Dan-K2VOL: I don't know if the model will hold for those sizes
[16:10] <Kerrye> Our balloon is 1200 g
[16:10] <Dan-K2VOL> kaymont does provide burst alt and diameter size specs
[16:10] <Kerrye> We plan on cutting off the curtain.
[16:10] <Kerrye> That will reduce weight.
[16:11] <jonsowman> Kerrye: calculator says 3.3kg neck lift for 5m/s ascent
[16:11] <jonsowman> will get you to about 31.5km
[16:12] <Kerrye> Is the neck lift without the cargo, lines, parachute, etc?
[16:12] <Dan-K2VOL> the 9m/s ascent produced in that calculator when you put in 25900 for the burst alt is not a rate you want to have
[16:13] <Kerrye> 3.3kg neck lift is only 7.27 pounds
[16:13] <Kerrye> Our cargo is 4 lbs and the balloon will be about 5.
[16:13] <Kerrye> Confused.
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[16:14] <jonsowman> Kerrye: neck lift is indeed without payload, chute, etc
[16:14] <Dan-K2VOL> 7.27-4 = 3.27lbs positive lift on your payload
[16:15] <Dan-K2VOL> just make up a dead weight of 7.27 lbs and fill balloon until that lifts off the gnd
[16:15] <Kerrye> Oh so the balloon is not in consideration as far as lift weight?
[16:15] <m1x10> jonsowman: launch volume is how much helium to put in the balloon in order to launch?
[16:15] <jonsowman> Kerrye: Dan-K2VOL just explained it :)
[16:16] <Kerrye> So 7.27 lift weight minus 4 pounds=3.27 extra lift needed?
[16:16] <Dan-K2VOL> yes
[16:16] <jonsowman> m1x10: yes
[16:16] <m1x10> Also I dont understand neck lift.
[16:17] <Dan-K2VOL> it's just the force pulled up by the balloon if you were to attach a scale to the neck of the balloon with no payload
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[16:17] <Kerrye> OK, so to be clear....I make a 7.27 pound dummy weight out of water jugs. Once balloon is negitive lift using that, I detach and attach cargo and go.
[16:17] <mattltm> Hi all :)
[16:17] <Dan-K2VOL> well, yes, once the balloon lifts that weight off the ground
[16:17] <Kerrye> How do you get 7.27 pounds?
[16:18] <Dan-K2VOL> make sure it's lifting it in calm and not just wind gusts
[16:18] <Kerrye> I entered in 1814 cargo, 1200 balloon, 25908 target altitude.
[16:18] <Dan-K2VOL> wind gusts can create aerodynamic lift due to the shape of the balloon
[16:18] <Kerrye> Neck lift shows 8436
[16:18] <jonsowman> Kerrye: that is _minimum_ required altitude
[16:18] <Kerrye> 8436 g neck lift then = 18.598 pounds
[16:19] <Kerrye> of neck lift
[16:19] <jonsowman> delete that field and just input a sensible ascent rate
[16:19] <Dan-K2VOL> if you really want it to burst at that altitude then do that, the 1200g balloon is meant to burst mUCH higher
[16:19] <Kerrye> so how did you get 7?
[16:19] <SpeedEvil> Kerrye: If you fill it that full, it bursts lower
[16:19] <SpeedEvil> Kerrye: fill it less full, and it goes higher
[16:19] <Dan-K2VOL> put an ascent rate in not a target altitude
[16:19] <Dan-K2VOL> put 5m/s in
[16:19] <Dan-K2VOL> which is a normal rate
[16:19] <Kerrye> What do you think is a good accent rate?
[16:20] <Kerrye> So you think 5 is normal? Others use it?
[16:20] <Dan-K2VOL> 1000fpm is the usual here in the states, which is about 5m/s
[16:20] <Kerrye> That seems low
[16:20] <Kerrye> OK
[16:20] <Dan-K2VOL> it's not
[16:20] <Dan-K2VOL> it's a balloon, not a rocket :-P
[16:20] <Kerrye> Ok, just fed in 5 m/s, let me see.
[16:21] <Kerrye> HA
[16:21] <Kerrye> We are rocket scientists.
[16:21] <jonsowman> 5m/s is about the highest I'd want to go
[16:21] <Dan-K2VOL> ahhh that explains it :-P
[16:21] <jonsowman> normally go for more like 4
[16:21] <Dan-K2VOL> listen to jon, I'm not a metric native
[16:21] <jcoxon> hey jonsowman
[16:21] <jonsowman> hi jcoxon
[16:21] <jonsowman> I emailed you
[16:21] <Dan-K2VOL> and google convert isn't working for me at the moment ;-)
[16:21] <Kerrye> I see, so with that data, we get 3227g of neck lift or 7.11 pounds of lift.
[16:22] <jonsowman> Kerrye: that sounds about right
[16:22] <Dan-K2VOL> yeah
[16:22] <jcoxon> jonsowman, will add you
[16:22] <Dan-K2VOL> where are you kerrye
[16:22] <jonsowman> cheers jcoxon
[16:22] <Kerrye> So if our cargo = say 4.2 pounds we have about 3 pounds of extra lift.
[16:22] <Dan-K2VOL> just curious
[16:22] <Dan-K2VOL> yep
[16:22] <Kerrye> We are in fort worth, tx. elevation 1,700'
[16:22] <Dan-K2VOL> ah
[16:23] <Dan-K2VOL> you should go to Palestine sometime to see the NASA balloon facility, nice place
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[16:25] <Dan-K2VOL> kerrye find other US ballooners around you also by joining the GPSL yahoo group
[16:26] <Dan-K2VOL> the US groups often use email only rather than chat
[16:26] <Kerrye> Will look for that.
[16:27] <Kerrye> Dan-to reach 90,000' with a payload of 4.1 pounds, what would you use for neck lift?
[16:27] <Kerrye> Want to see what you would go with.
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[16:32] <jonsowman> Kerrye: neck lift 3282g
[16:32] <Dan-K2VOL> do you just want to reach that high or burst there
[16:32] <jonsowman> if you want to burst there, then a 1200g balloon is too big really
[16:33] <jonsowman> you'll use a tonne of helium to do it
[16:33] <Kerrye> We have it.
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[16:33] <Dan-K2VOL> I'd probably go with the cheaper 800g balloon, it should burst around there with 4.1lbs lift at 5m/s
[16:33] <Kerrye> We have the helium and the 1200 balloon already.
[16:33] <Dan-K2VOL> how much helium do you have?
[16:33] <SpeedEvil> You can part-fill it with air to make it burst earlier
[16:34] <jonsowman> that's a clever idea
[16:34] <jonsowman> bit of a waste of a 1200g though
[16:34] <Kerrye> We have about 460 c.f.
[16:35] <Dan-K2VOL> oh boy that's more than enough, just do what the calc says then if you really want to, but it's going to be very thin at launch and liable to rupture
[16:35] <Dan-K2VOL> 15.4lbs neck lift
[16:35] <Kerrye> We need to figure out to meet in the middle someplace.
[16:35] <Dan-K2VOL> that's also going to be very dangerous to hold if there's gusts
[16:35] <Dan-K2VOL> why burst at 90k
[16:36] <Dan-K2VOL> what are you trying to acheive
[16:36] <Kerrye> 90K for our first go.
[16:36] <Kerrye> We only want it to fly no more than 100 miles.
[16:36] <Dan-K2VOL> ah then what you need is a cutdown device, not an overfilled balloon
[16:36] <Dan-K2VOL> go down that route, much safer and useful
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[16:37] <Dan-K2VOL> many ways to do it
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[16:37] <Dan-K2VOL> but 30ga nichrome wire with 4 AA Energizer ultimate lithiums on a timer works swell
[16:37] <Kerrye> OK, where do you get a cutdown device?
[16:38] <Dan-K2VOL> you either make it, or Carl Lyster of Knoxville TN may sell them
[16:38] <Kerrye> Thanks
[16:38] <Dan-K2VOL> there may be others willing to make it for you
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[16:38] <Kerrye> At this point, we may just shoot for an overfilled balloon.
[16:39] <Dan-K2VOL> if you do that be aware that anyone near any of the rope needs to have very heavy gloves on, a balloon with that big of a surface are with that much excess lift could easily take a finger off if there's a strong gust of wind
[16:40] <Kerrye> Good call.
[16:40] <Dan-K2VOL> good luck! let us know how it goes, I've gtg lunch
[16:40] <Dan-K2VOL> ttyl
[16:41] <W0OTM> burst alt of 73K with a 3000g balloon?
[16:41] <W0OTM> seems wrong
[16:42] <W0OTM> maybe something happened?
[16:43] <Kerrye> Thanks guys I will give you the report of this green launch
[16:44] <Dan-K2VOL> heh any number of things on a first launch
[16:58] <m1x10> seeedstudio got a nice geiger tube
[16:58] <m1x10> http://garden.seeedstudio.com/index.php?title=Geiger_Counter
[16:59] <m1x10> http://www.seeedstudio.com/depot/j408947-geiger%C2%96m%C3%BCller-tube-p-834.html?cPath=144_194
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[17:02] <BrainDamage> there's not even the min energy level for the photons indicated :/
[17:04] <griffonbot> @RITBlimp: Hey #hamradio ops check this out at #rit http://j.mp/m1sMpK This Sat. #arhab launch in the #roc! #hamr [http://twitter.com/RITBlimp/status/65461796634497024]
[17:04] <griffonbot> @KB1LQC: Hey #hamradio ops check this out at #rit http://j.mp/m1sMpK This Sat. #arhab launch in the #roc! #hamr [http://twitter.com/KB1LQC/status/65461800061255680]
[17:04] <griffonbot> @CollegeARC: Hey #hamradio ops check this out at #rit http://j.mp/m1sMpK This Sat. #arhab launch in the #roc! #hamr [http://twitter.com/CollegeARC/status/65461801881575424]
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[17:19] <W0OTM> jcoxon: you there
[17:19] <fsphil> yay home
[17:20] <jcoxon> yup
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[17:20] <W0OTM> jcoxon: I think you gave me an example sting for inporting data into the tracker database
[17:20] <W0OTM> \
[17:21] <mattltm> Hi again :)
[17:21] Kerrye (475b7b9e@gateway/web/freenode/ip.71.91.123.158) left irc: Quit: Page closed
[17:21] <W0OTM> I thought I was a php string
[17:21] <W0OTM> but I lost my notes
[17:22] <jcoxon> e.g. http://domain.com/tracker/track.php?vehicle=halo&time=233720&lat=5142.8844N&lon=00007.1758W&alt=123.9&heading=40&speed=20.5&pass=yourpass
[17:22] <W0OTM> yeah
[17:22] <W0OTM> thats it
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[17:22] <jcoxon> of course swapping out domain.com and yourpass
[17:22] <W0OTM> yeah
[17:23] <jcoxon> also it can be in decimal as well
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[17:23] <jcoxon> bbl
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[17:43] Action: Laurenceb crashes into the channel
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[17:46] <Laurenceb> my lsm303dlh wont wrok :(
[17:46] <Laurenceb> got the 1.8v ldo fitted
[17:51] <Dan-K2VOL1> hey laurenceb
[17:52] <Laurenceb> hi
[17:52] Action: Laurenceb is out of ideas
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[17:58] <Laurenceb> it might just be the way im using a bus pirate to scan the addresses
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[18:02] <Laurenceb> http://forum.bildr.org/viewtopic.php?f=19&t=323
[18:02] <Laurenceb> hmf so not that
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[18:08] <griffonbot> Received email: Dan Bowen "Re: [UKHAS] Looking for high altitude life, one flight under my belt
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[18:23] <NigeyS> rar evening peeps
[18:24] <mattltm> Hey NigeyS :)
[18:24] <NigeyS> hey matt!#
[18:24] <NigeyS> oops -#
[18:24] <mattltm> lol.
[18:24] <Dan-K2VOL1> hi nigeys
[18:25] <NigeyS> hey dan!
[18:25] <Dan-K2VOL1> how's it going
[18:25] <NigeyS> woooooooooo \o/ paul van dyk .. neighbours HATE me today lmao
[18:25] <NigeyS> all good dude, hows you ?
[18:26] <Dan-K2VOL1> good good
[18:26] <NigeyS> yey!
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[18:41] Nick change: GW8RAK_ -> GW8RAK
[18:41] <griffonbot> Received email: "Re: [UKHAS] Looking for high altitude life, one flight under my
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[18:43] <chembrow> evenin evenin
[18:43] <NigeyS> evening chembrow
[18:43] <mattltm> Hey chembrow
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[18:44] <chembrow> hi guys. much going on?
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[18:51] <mixio> http://2.bp.blogspot.com/-6ZVKkaOPQ2E/TcBOZG4caAI/AAAAAAAAAC4/u6YZLv04KQ8/s1600/DSC00482.JPG
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[19:04] <W0OTM> fsphil: tyou there
[19:04] <W0OTM> fsphil: you there?
[19:05] <fsphil> mostly, floating about the room a bit
[19:06] <W0OTM> you familiar with the tracker code?
[19:06] <W0OTM> what is the mission_id field?
[19:06] <fsphil> not really, but at a guess I'd say it's the callsign
[19:07] <fsphil> so $$hadie,424,54.6546,-7.45345 -- the mission would be hadie
[19:08] <W0OTM> no hadie would be the "vehicle"
[19:10] <W0OTM> brb
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[19:10] <mixio> ping fsphil
[19:10] <fsphil> yoo
[19:11] <mixio> heeeeeey
[19:11] <chembrow> popular tonight fsphil :)
[19:11] <fsphil> lol
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[19:20] <SAIDias> YES! http://www.ihabproject.com/Tracker/
[19:20] <SAIDias> got aprs data fed into the tracker
[19:21] <fsphil> sweeet
[19:22] <fsphil> it's so much better than aprs.fi
[19:25] <GW8RAK> I was asking about AC motors this morning and now I'm home, I've got the part numbers etc. The motors are reversible synchronous ones. Do I need any special considerations about controlling them?
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[20:00] <Laurenceb> hmf... lsm303dlh is an hmc5883 ans lsm302dlh shoved together
[20:01] <Laurenceb> so im guessing its some franken combination of the logic level shifters from both those designs
[20:01] <Laurenceb> but... both datasheets say you can turn off VDD_digital and have VDD and VDD_IO high without frying
[20:01] <Laurenceb> so i dont see what could be wrong with my lsm303
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[20:12] <griffonbot> Received email: Dan Bowen "Re: [UKHAS] Looking for high altitude life, one flight under my
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[20:28] <Laurenceb> http://www.esa.int/images/_SCO0833.JPG
[20:31] <SpeedEvil> Wow - that's hires for an image from orbit. :)
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[20:33] <hibby> that's our plan for UKube but with different filters
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[20:43] <nelly11> Hi Everyone. I am new to High altitude ballooning and I have a question regarding the equipment I need. I roughly know what I need but I am not sure what to purchase. Do you perform some calculations before you determine the specs of the equipment to buy of do you just buy what you think you might need?
[20:44] <fsphil> I read about other launches to get an idea of what was needed
[20:44] <fsphil> and a lot more info from the ukhas wiki
[20:44] <fsphil> the rest I asked about here :)
[20:45] <nelly11> Oh ok, so you just used the same equipment other people used?
[20:45] <fsphil> basically
[20:45] <fsphil> tried and tested
[20:45] <nelly11> ok thanks :)
[20:47] <SAIDias> fsphil: ok, so I have the tracker auto polling the APRS-IS database
[20:47] Nick change: SAIDias -> W0OTM
[20:48] <W0OTM> fsphil: and auto populating the tracker database
[20:48] <Upu> hey nelly11 welcome aboard :) Best advise is to have a look through peoples project pages here : http://ukhas.org.uk/frontpage:projects
[20:48] <SpeedEvil> nelly11: It depends.
[20:48] <fsphil> I was reading about APRS-IS today, trying to figure out how the data got from a receiving station to aprs.fi
[20:48] <SpeedEvil> nelly11: You pretty much need to pick a weight, and then work to that.
[20:48] <SpeedEvil> nelly11: Helium and balloons is a major cost
[20:48] <SpeedEvil> nelly11: Where are you?
[20:49] <nelly11> im back, sorry was talking to my housemate
[20:51] <nelly11> SpeedEvil: I am more worried about the communications because I need two way comms between the balloon and the ground
[20:51] <SpeedEvil> You're in the UIS then?
[20:52] <nelly11> what's UIS?
[20:52] <SpeedEvil> IUS
[20:52] <SpeedEvil> US
[20:52] <nelly11> nope
[20:52] <fsphil> two-way comms is an interesting topic
[20:53] <nelly11> I am trying to do a HAB experiment as part of my thesis
[20:53] <SpeedEvil> Where ar eyou then?
[20:53] <SpeedEvil> ah
[20:53] <nelly11> I am in the UK
[20:53] <SpeedEvil> US requires commandable cutdown - which is why
[20:54] <nelly11> my balloon should be able to receive commands from a ground station and send data as well (not huge amounts)
[20:54] <fsphil> I'm not sure 2-way is possible with normal license-free radio modules
[20:54] <fsphil> at least not without really big antennas
[20:56] <nelly11> ok...I will check that...but with regards to the downlink...surely i need to do some calculations to determine how much data I need to send to the ground and from there pick the equipment/device that can provide the required capacity?
[20:56] <SpeedEvil> Somewhat.
[20:57] <SpeedEvil> We get 500km or so on a 10mW 433 transmitter with the right modulation to a good radio.
[20:57] <SpeedEvil> at 50bps
[20:58] <BrainDamage> what modulation out of curiosity?
[20:58] <SpeedEvil> fsk
[20:58] <SpeedEvil> 400hz or so shift
[21:00] <Upu> BrainDamage http://ava.upuaut.net/?p=101
[21:02] <Dan-K2VOL1> nelly11 I think this might get you two-way comms in a simple package, but I've never tried it: http://jeelabs.net/projects/9/wiki/JeeNode
[21:03] <Dan-K2VOL1> and the UK guys will know more about the law regarding 868mhz operation from balloon
[21:03] <hibby> they;re pretty cool
[21:03] <nelly11> thanks!
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[21:05] <Dan-K2VOL1> ttyl
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[21:06] <Lunar_Lander> hello
[21:06] <nelly11> hello!
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[21:11] <Lunar_Lander> hi nelly11 and m1x10
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[21:17] <m1x10> hey
[21:17] <m1x10> Lunar_Lander: i think u r interested in this: http://2.bp.blogspot.com/-6ZVKkaOPQ2E/TcBOZG4caAI/AAAAAAAAAC4/u6YZLv04KQ8/s1600/DSC00482.JPG
[21:18] <Lunar_Lander> cool, thanks!
[21:19] <m1x10> tomorrow im sending the new pcb to china
[21:19] <Lunar_Lander> ?
[21:19] <Lunar_Lander> they'll copy and steal it!!
[21:19] <Lunar_Lander> D:
[21:20] <fsphil> intentionally build a fault into it, one you can fix quickly
[21:20] <m1x10> no :p
[21:21] <BrainDamage> just merge 2-3 tracks but they can still be sep with a knife
[21:22] <Lunar_Lander> xD
[21:31] <m1x10> wow
[21:31] <m1x10> 1500g balloon
[21:31] <m1x10> 90pounds!
[21:31] <m1x10> wtf!
[21:31] <m1x10> 100 euro for the balloon?
[21:32] <Lunar_Lander> yes
[21:32] <hibby> welcome to HAB
[21:33] <fsphil> 1000g balloon is a bit more reasonable
[21:33] <hibby> we launched a 3kg
[21:36] <m1x10> its awful
[21:36] <m1x10> i must find a sponsor
[21:37] <fsphil> wait until you price the helium :)
[21:37] <Laurenceb> lmao the conservative party election broadcast just broke
[21:37] <Laurenceb> i suspect someone in the bbc doesnt like them
[21:37] <BrainDamage> what do you have to send that weights so much?
[21:38] <Lunar_Lander> BrainDamage you mean lifting heavy weights?
[21:38] <fsphil> a small payload + 600g balloon would be lovely and cheap(ish)
[21:39] <BrainDamage> yes, I mean, 1.5kg electronics is a LOT
[21:39] <SpeedEvil> Hydrogen.
[21:39] <fsphil> I was planning on making some H2 via electrolysis for a 600g balloon but I ended up making a very small amount of H2, O and lots of rust
[21:39] <hibby> gnarly
[21:39] <SpeedEvil> yeah - you need the right electrodes.
[21:39] <SpeedEvil> Platinised niobium is the shizzle.
[21:40] <BrainDamage> I had pretty decent results with graphite from old batteries
[21:40] <fsphil> these where stainless steel scrub thingys
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[21:40] <fsphil> with 48V applied between them
[21:40] <SpeedEvil> platinised niobium will last 'forever'
[21:40] <mixio> the explosive guy
[21:40] <SpeedEvil> 48V is way too much
[21:40] <fsphil> ooh
[21:40] <fsphil> made some lovely sparks when they touched
[21:40] <BrainDamage> water potential is few V
[21:41] <BrainDamage> iirc even less than 2
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[21:42] <fsphil> I just thought it would be faster with a higher voltage
[21:42] <fsphil> was the voltage from my PV panels
[21:42] <fsphil> actually it was probably closer to 60V
[21:42] <SpeedEvil> It's not
[21:42] <BrainDamage> it's current what produces the effect
[21:42] <SpeedEvil> You get one atom of hydrogen for one electron
[21:42] <SpeedEvil> (ideally)
[21:42] <SpeedEvil> Extra voltage just means you have more voltrage to drive unwanted reactions.
[21:43] <fsphil> mm
[21:43] <fsphil> would that have produced the rust?
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[21:43] <fsphil> the tub of water was a deep orange within about 10 minutes
[21:43] <SpeedEvil> yes
[21:43] <BrainDamage> it surely helped the reaction
[21:44] <SpeedEvil> Though little SS is really suitable for this
[21:44] <fsphil> I will try with a lower voltage next time
[21:44] <BrainDamage> you want, let's say 3-4V, and as much current as possible
[21:44] Nick change: TraumaPony -> spacekitteh
[21:44] <fsphil> I tried with a low voltage before but the current was minimal
[21:44] <fsphil> the water has too high a resistance
[21:44] <SpeedEvil> You can't do it with straight water.
[21:44] <Laurenceb> suicide bombers, they never make the smae mistake twice
[21:44] <BrainDamage> parallel the plates, increase surface, and add more electrolythe
[21:45] <BrainDamage> what did you use as electrolithe? ( yeah, I don't know the english spelling of it )
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[21:45] <fsphil> I got the spongy things because of the better surface area
[21:46] <fsphil> a stainless steel sponge
[21:46] <BrainDamage> no no, the substance you added to water to make it conductive
[21:46] <fsphil> aah, nothing that time
[21:46] <fsphil> just tap water
[21:46] <BrainDamage> pure water is actually a pretty decent insulator ( if you ignore autoprotolys, or whatever it's called )
[21:47] <BrainDamage> add some HCl, you'll notice resistance dropping really fast
[21:47] <fsphil> I've read about people adding salt
[21:47] <SpeedEvil> Salt is bad.
[21:47] <BrainDamage> don't use NaCl, it produces Chlorine gas
[21:48] <fsphil> that was my worry
[21:48] <SpeedEvil> Well - table salt
[21:48] <SpeedEvil> not all salts
[21:48] Action: Laurenceb is trying to understand voltammetry
[21:49] <fsphil> not sure where I'd get HCl
[21:49] <BrainDamage> the commercial name here is muriatic acid
[21:49] <BrainDamage> it's
[21:49] <BrainDamage> HCl dissolved in water
[21:49] <BrainDamage> pure HCl is gas
[21:49] <BrainDamage> it's kinda like your carbonated water, the gas is dissolved in it
[21:50] <fsphil> ah, £18 for 2.5 litres
[21:50] <fsphil> http://www.reagent.co.uk/hydrochloric-acid/hydrochloric-acid-ar-1-18-sg.html
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[22:13] <fsphil> [ot] http://www.flickr.com/photos/lightsinthedark/5685070374/
[22:14] <Lunar_Lander> fsphil do you know where to find megaohm and gigaohm resistors?
[22:14] <BrainDamage> digikey has up to 5 GOhm resistors
[22:14] <fsphil> ^^
[22:15] <fsphil> I've never needed one that high tbh
[22:15] <Lunar_Lander> cool
[22:15] <BrainDamage> are you building an ion chamber?
[22:15] <Lunar_Lander> I just found that ion counter in scientific american you know?
[22:15] <Lunar_Lander> and he needs a 1 gigohm and a 10 megohm one
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[22:16] <BrainDamage> remember that low leakage transistor/opamp are just as important
[22:16] <Lunar_Lander> yeah
[22:16] <Lunar_Lander> I read that ion chambers also need megohms
[22:17] <BrainDamage> MOhm is actually small, I did a calc for a can I have here I plan to build and I had on the pA range currents
[22:17] <Lunar_Lander> ah
[22:17] <BrainDamage> for background radiation
[22:17] <BrainDamage> it depends on your chamber volume & electrode size
[22:18] <BrainDamage> there's one thing though
[22:18] <BrainDamage> if you got a radioactive sample of known emission
[22:19] <BrainDamage> you can build it without doing much calcs
[22:19] <BrainDamage> and simply adjust a tuning param afterwards
[22:19] <BrainDamage> oh, and remember that limiting the bandwith helps quite a bit to reduce the noise
[22:21] <Lunar_Lander> that is good
[22:21] <Lunar_Lander> thanks :)
[22:26] <Lunar_Lander> fsphil how do I find them on digikey?
[22:26] <Lunar_Lander> "resistor megaohm" has 0 results
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[22:26] <fsphil> that I'm not sure, I haven't used them
[22:28] <fsphil> http://uk.farnell.com/fixed-value
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[22:28] <fsphil> farnell have a parametric search with some nice big resistors
[22:30] <Lunar_Lander> just found it :)
[22:30] <Lunar_Lander> OHH!
[22:30] <Lunar_Lander> 500 GOhm!
[22:35] <russss> Unit Price: £85.21
[22:35] <russss> ouch!
[22:36] <Lunar_Lander> yeah
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[22:36] Nick change: BrainDamage1 -> BrainDamage
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[22:48] <W0OTM> http://www.ihabproject.com/Tracker/
[22:48] <W0OTM> fsphil: you there
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[23:00] <Lunar_Lander> good night
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[23:36] <W0OTM> Anyone around>?
[23:42] <SpeedEvil> ?
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[23:45] <W0OTM> hi SpeedEvil
[23:45] <SpeedEvil> hi
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[23:59] <W0OTM> whats you doing
[23:59] <W0OTM> you involved with the tracker application (spacenear.us)
[23:59] <SpeedEvil> Nope.
[00:00] --- Wed May 4 2011