highaltitude.log.20090430

[00:14] <Laurenceb> holy $3423
[00:14] <Laurenceb> http://www.sparkfun.com/commerce/product_info.php?products_id=8889
[00:14] <Laurenceb> its back in stock XD
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[03:05] <natrium42> ahaha --> http://www.facebook.com/group.php?gid=6153572300
[03:05] <natrium42> "The James Coxon Quotes appreciation society"
[03:05] <natrium42> Laurenceb_ ^
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[07:09] <rjharrison> Ping natrium
[07:09] <natrium42> hey
[07:10] <rjharrison> Glad you are still up
[07:10] <rjharrison> I mad a few changes to the tracker
[07:10] <rjharrison> To allow you to view previous missions if you know the mission id
[07:10] <natrium42> ah ok
[07:11] <rjharrison> do you want that for space near us
[07:11] <rjharrison> Minor changes
[07:11] <natrium42> i was working on a user control mechanism which includes this functionality
[07:11] <natrium42> but it's not done yet
[07:11] <rjharrison> ok np
[07:11] <rjharrison> I'll leave you to it
[07:11] <natrium42> thanks though
[07:12] <natrium42> are you going out to the launch today?
[07:12] <rjharrison> No but I will be tracking hopefully
[07:12] <rjharrison> From work
[07:12] <rjharrison> and also by vnc into home station too
[07:13] <natrium42> ok, great
[07:13] <natrium42> i might be still sleeping when steve launches :/
[07:13] <rjharrison> james is working on a new client that can be slaved to work remotely
[07:13] <rjharrison> Right I'm off to work
[07:13] <natrium42> have fun
[07:13] <natrium42> later
[07:13] <rjharrison> Have a good evening
[07:13] <natrium42> you too
[07:13] <rjharrison> steve is launching 2pm BST
[07:14] <rjharrison> in about 7 hoursa
[07:14] <rjharrison> bye
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[11:30] <hallam> hi edmoore
[11:30] <hallam> how was your exam?
[11:30] Matt_APEX (n=chatzill@93-97-184-163.zone5.bethere.co.uk) joined #highaltitude.
[11:30] <edmoore> good morning
[11:30] <edmoore> tough
[11:30] <Matt_APEX> hey
[11:30] <edmoore> but survived
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[11:30] <edmoore> I think others fared worse
[11:30] <edmoore> one wrote a 1.5 page letter to the examiner just appologising
[11:30] <hallam> well done, then
[11:31] <hallam> haha
[11:31] <hallam> I have been writing "Sorry. This is embarassing." at the bottom of my worst ones
[11:31] <hallam> hi Matt_APEX and KingJ
[11:31] <hallam> edmoore: do you know what happend wrt helium and kirwan in the end?
[11:32] <KingJ> Hello
[11:32] <Matt_APEX> kingj is sitting next to me and htought he would join :)
[11:32] <edmoore> hallam: no idea
[11:32] <edmoore> been in an exam all morning
[11:32] <edmoore> i told kirwan to expect helium on thursday morning several days ago
[11:32] <edmoore> should be ok
[11:33] <edmoore> hi KingJ - another ballooner?
[11:33] <Matt_APEX> nope
[11:33] <edmoore> hallam: Jon_APEX should be coming to Selwyn to read engineering next year. Have already recuited him
[11:33] <KingJ> Just someone who has taken an interest in their project
[11:33] <hallam> oh, ok
[11:33] <edmoore> cool, welcome
[11:34] <Matt_APEX> so i hear theres a launch 2day?
[11:34] <edmoore> correct
[11:34] <edmoore> steve is launching
[11:34] <edmoore> I have just set up a listening station here in cambridge
[11:34] <Matt_APEX> cool
[11:34] <edmoore> and have got it tuned to radio 4
[11:34] <Matt_APEX> so we can see how the DL works :)
[11:35] <edmoore> which is quite an expensive way of listening to the radio. but at least it works
[11:35] <hallam> hehe
[11:35] <Matt_APEX> yea
[11:35] <edmoore> about to test-run the latest version of the dl client
[11:35] <Matt_APEX> have u managed to pick up TV on it?
[11:35] <Matt_APEX> ok
[11:35] <edmoore> it doesn't have the badnwidth for TV
[11:35] <Matt_APEX> ive heard the audio from a TV station on a radio before
[11:35] <edmoore> output is audio
[11:35] <edmoore> TV is about 3 MHz
[11:36] <Matt_APEX> yea, u could only hear the audio
[11:36] <Matt_APEX> and the quality wasnt great
[11:36] <edmoore> spooky, given the way it's encoded
[11:36] Jon_APEX (n=chatzill@93-97-184-163.zone5.bethere.co.uk) joined #highaltitude.
[11:36] <edmoore> greetings Jon_APEX
[11:36] <Jon_APEX> Hiya
[11:36] <SpeedEvil> TV audio bandwidth isn't 3MHz
[11:36] <edmoore> here to join the fun?
[11:36] <edmoore> hrm, I could set up my laptop with a webcam to stream the launch
[11:36] <Matt_APEX> o hi jon
[11:36] <Jon_APEX> I'm only here for a few minutes, & hi Matt :)
[11:36] <edmoore> SpeedEvil: no, TV picture
[11:37] <KingJ> Don't forget me Jon ;)
[11:37] <Matt_APEX> thers some1 else you know who w=though he would join
[11:37] <Matt_APEX> yea him
[11:37] <SpeedEvil> edmoore: yes - but tv audio can be picked up on an appropriately tuned FM reciever - unless I'm confused
[11:37] <Jon_APEX> hello kingsley
[11:37] <SpeedEvil> edmoore: as it's a 50(?)Khz FM
[11:37] <edmoore> true, but i thought it was encoded in gaps between lines
[11:38] <SpeedEvil> edmoore: that's colour
[11:38] <hallam> yeah isn't it just standard FM on a carrier frequency that's related to, but separate from, the video signal?
[11:38] <hallam> and teletext
[11:38] <hallam> oh well
[11:38] <SpeedEvil> edmoore: audio is completely seperate
[11:38] <edmoore> I love jame's version control system for the listening clinet
[11:38] <edmoore> just tag a number on the end of the file
[11:38] <edmoore> clinet.py, clinet2.py, client3.py etc
[11:38] <hallam> in a year or two none of it will matter, all digital
[11:39] <hallam> hah
[11:39] <hallam> works
[11:39] <Matt_APEX> of course it would ;)
[11:40] <hallam> ok I'm going to hit the library
[11:40] <hallam> edmoore: what time is launch? will you need a hand?
[11:41] <edmoore> ok, client is operational
[11:41] <edmoore> hallam: not sure yet - not heard rom steve
[11:41] <edmoore> i can text you when he arrives
[11:41] <edmoore> but basically i'm just going to help get it up in the air then get on with work
[11:41] <edmoore> 92.225Mhz has just had music on it for the last 20 mins
[11:41] <edmoore> beginning to think it isn't radio 4
[11:42] <SpeedEvil> they occasionally do that to confuse
[11:42] <hallam> ok
[11:42] <hallam> yeah, text me, I'll see how stuck into work I am
[11:42] <SpeedEvil> http://www.bbc.co.uk/radio4/
[11:42] <SpeedEvil> for current program
[11:42] <edmoore> this doesn't sound like scifi comedy
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[11:43] <edmoore> how do you find out regional freqs for the radio on their site?
[11:44] <Jon_APEX> R4 is 91-93 FM across the whole country isn't it?
[11:44] <SpeedEvil> no
[11:44] <SpeedEvil> It's 94.9 here
[11:45] <SpeedEvil> edmoore: err
[11:45] <SpeedEvil> edmoore: I know this
[11:45] <Jon_APEX> sorry just checked Wiki, you're right
[11:45] <edmoore> good lord, radio 4 is about 60 over 9 over a huge bandwidth
[11:45] <Jon_APEX> 92-96 Mhz FM
[11:45] <edmoore> tis as if we're right next to a transmitter
[11:46] <Jon_APEX> http://www.bbc.co.uk/reception/transmitters/radio/index.shtml
[11:47] <SpeedEvil> http://www.bbc.co.uk/reception/transmitters/radio/index.shtml
[11:47] <SpeedEvil> meh
[11:47] <edmoore> my info theory lecturer is in the guardian today - http://www.guardian.co.uk/environment/cif-green/2009/apr/29/renewable-energy-david-mackay
[11:47] <edmoore> Jon_APEX: this chap is perhaps the best lecturer I've ever had
[11:47] <edmoore> take his course :)
[11:47] <Jon_APEX> cool, reading that now
[11:48] <edmoore> watch the vid
[11:48] <Jon_APEX> OK
[11:48] Action: SpeedEvil is unsure if he's done his energy rant here.
[11:49] <SpeedEvil> Basically - ramp up nuclear 20-fold, swap all fixed loads over from oil and gas to electric
[11:49] <SpeedEvil> slashes the oil consumption for all but vehicles
[11:50] <SpeedEvil> and does wonders for the balance of trade
[11:50] <SpeedEvil> (as you're not buying oil anymore)
[11:52] <edmoore> this is the same chap that came up with (or re-came up with) Low Density Parity Check Codes
[11:54] <Jon_APEX> very interesting stuff
[11:54] Action: SpeedEvil has no clue.
[11:55] <SpeedEvil> ECC using parity bits?
[11:58] <SpeedEvil> ah
[11:58] <SpeedEvil> not really
[12:03] <edmoore> closest we've got to the shannon limit
[12:03] <edmoore> so far
[12:04] <edmoore> his text book on info theory is my favourite text book, of all the textbooks I own
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[12:05] <edmoore> it's almost bedside reading - very engaging, full of random assides on sex and procreation, human eyes, and so on, aswel as being the book for compression, communication, inference and learning algorithms
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[12:44] Nick change: KingJ -> kingj
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[13:31] <edmoore> afternnon everyone
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[13:34] <jcoxon> hey all
[13:35] <edmoore> hi jcoxon
[13:37] <JON_APEX_> balloon launched
[13:37] <JON_APEX_> ?
[13:37] <edmoore> JON_APEX_: not yet
[13:37] <jcoxon> i'm only on for 30mins
[13:37] <edmoore> steve isn't here yet
[13:37] <jcoxon> on my break
[13:37] <jcoxon> delivered another baby this morning
[13:37] <JON_APEX_> Ah OK
[13:38] <edmoore> jcoxon: you're making a habit of this
[13:38] <jcoxon> i am on labour ward :-p
[13:38] <jcoxon> my last day
[13:38] <edmoore> what is your favouritest ward?
[13:39] <jcoxon> this is quite good fun
[13:39] <jcoxon> i'm a fan of the slow pace of life on geriatrics
[13:42] <jcoxon> okay my client is up and running
[13:42] <jcoxon> its a little bit special as it searches for a signal
[13:43] <jcoxon> hopefully it'll work
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[13:45] <jcoxon> http://wiki.ukhas.org.uk/current_launch_details
[14:05] <jcoxon> right i'm off
[14:05] <jcoxon> good luck with the launch
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[14:15] <jonapex> hello:)
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[14:21] <g8khw> Running late
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[14:49] <jonapex> hows it going?
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[14:56] <g8khw> 20 mind
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[15:41] <rjharrison> launch very soon
[15:41] <rjharrison> see http://spacenear.us/tracker/
[15:41] <rjharrison> For live tracking
[15:42] <rjharrison> Humm
[15:42] <rjharrison> perhaps http://www.robertharrison.org/tracker/
[15:42] <rjharrison> It should be going throught to space near us
[15:48] <rjharrison> psace near us working
[15:48] <rjharrison> space
[15:48] <rjharrison> see http://spacenear.us/tracker/
[16:02] Last message repeated 1 time(s).
[16:02] <kleinjt> it is working fine for me
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[16:24] <edmoore> hi all
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[16:25] <rjharrison> Cool
[16:25] <rjharrison> Hi ed
[16:25] <rjharrison> do you have the freq
[16:26] <sbasuita> launch today?
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[16:29] <rjharrison> Humm alt
[16:29] <rjharrison> Yap live now on see http://spacenear.us/tracker/
[16:29] <rjharrison> yep
[16:30] Jon_APEX (n=chatzill@93-97-184-163.zone5.bethere.co.uk) joined #highaltitude.
[16:32] <rjharrison> Jon_APEX balloon in flight
[16:32] <rjharrison> see http://spacenear.us/tracker/
[16:32] <Jon_APEX> Looking at it now!
[16:32] <Jon_APEX> Great stuff
[16:33] <Jon_APEX> why is the latest altitude -46m?
[16:34] <edmoore> rjharrison: sorry, was running a landing sim for steve
[16:34] <edmoore> freq is 434.074.00 USB
[16:34] <edmoore> Jon_APEX: it shouldn't be currently
[16:35] <edmoore> but that's what it reckons it is at the groun d
[16:35] <edmoore> the green one is the most recent one
[16:35] <edmoore> it's heading north
[16:35] <edmoore> oh you're right
[16:35] <edmoore> well the gps is having issues
[16:35] <Jon_APEX> Ah OK, explains it
[16:35] <Jon_APEX> Was wondering if I was doing something wrong
[16:35] <rjharrison> wow shift
[16:36] <rjharrison> Seems to be revovering
[16:36] <rjharrison> recovering
[16:37] <edmoore> methinks it could be a foxhunting job
[16:37] <sbasuita> edmoore, what gps you using?
[16:38] <edmoore> this isn't one of ours
[16:38] <edmoore> it's Steve's
[16:38] <rjharrison> lassen
[16:38] <edmoore> it's a Lassen iQ
[16:38] <rjharrison> iq
[16:38] <rjharrison> How long is the lanyard
[16:38] <sbasuita> =/
[16:38] <sbasuita> that is worrying
[16:38] <rjharrison> I think the military is blocking
[16:38] <rjharrison> Interesting the the camera might be causing issues
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[16:41] <rjharrison> edmoore you had problems before
[16:42] <edmoore> it's worth investigating, although steve was saying, as seemed to be the case, that if you keep resetting the lassen several times in a short period it gets a bit upset
[16:43] <rjharrison> Ping SpeedEvil
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[16:52] Nick change: kingj -> KingJ
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[16:55] <SpeedEvil> ong
[16:56] <edmoore> ?
[16:58] <Jon_APEX> Any idea why the GPS is playing up then?
[16:58] <edmoore> a few
[16:59] <edmoore> can someone with excel run burst1a.xls for me please
[16:59] <edmoore> i will give you the parameters
[17:00] <Jon_APEX> Got it open at the moment
[17:00] <edmoore> ok cool
[17:01] <edmoore> can you make a 1kg payload
[17:01] <edmoore> a 1kg balloon
[17:01] <edmoore> adjust diameter until you get 4m/s ascent
[17:01] <edmoore> and then tell me what the burst alt is
[17:02] <Jon_APEX> diameter of 1.71m gives 4.02m/s ascent
[17:02] <Jon_APEX> Burst alt of 33121m
[17:12] <edmoore> thanks
[17:12] <edmoore> anticipating burst in about 45 mins
[17:17] <Jon_APEX> :)
[17:18] <edmoore> looks like he'll have to foxhunt it
[17:22] <edmoore> looks dodgy, that latest value
[17:24] <SpeedEvil> My god, that thing hit hard.
[17:26] <SpeedEvil> Oh - I see - they're all -47,m
[17:27] <edmoore> winds are faster than expected up top
[17:29] <edmoore> think she might have burst
[17:34] <SpeedEvil> is the -47m a tracker error
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[17:54] <edmoore> it's back on where i think it should be
[17:54] <edmoore> looks like a majorly upset gps
[17:54] <edmoore> 52.27433,0.34736
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[17:55] <Jcoxon> Hey all
[17:55] <Jcoxon> Does someone want to vnc into my computer
[17:55] <Jcoxon> To tune it
[17:57] <edmoore> Jcoxon: it'll need more than tuning
[17:57] <edmoore> but yes do
[17:58] <edmoore> i need food
[17:58] <edmoore> call me if anything hapens
[17:58] <Jcoxon> Oh really, is the radio still working?
[18:05] <Jcoxon> Bbl
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[18:22] <rjharrison> gps is back
[18:23] <g8khw> tar - where is it on the map
[18:23] <rjharrison> Just trying to give you a definate
[18:24] <rjharrison> 52.27647,0.34964,5357
[18:24] <rjharrison> This is a save coord.
[18:24] <rjharrison> safe
[18:24] <g8khw> Tar
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[18:25] <rjharrison> James
[18:25] <rjharrison> U at home?
[18:25] <rjharrison> http://maps.google.co.uk/maps?f=q&source=s_q&hl=en&geocode=&q=52.27647,0.34964&sll=53.800651,-4.064941&sspn=21.665954,68.378906&ie=UTF8&ll=52.195823,1.378784&spn=1.399033,4.273682&z=9&iwloc=A
[18:25] <jcoxon> hi
[18:25] <jcoxon> just got home
[18:26] <jcoxon> urgh it looks a mess
[18:27] <jcoxon> is it down?
[18:28] <g8khw> Is now
[18:28] <jcoxon> okay
[18:28] <g8khw> And I can still hear it
[18:28] <jcoxon> thats good news
[18:29] <jcoxon> what freq?
[18:29] <edmoore> last safe 52.28959,0.33724,3141
[18:29] <edmoore> 17:22:45,52.28959,0.33724,3141
[18:29] <edmoore> GMT
[18:29] <edmoore> so add 1 to the hour
[18:30] <jcoxon> okay
[18:31] <g8khw> Bbl
[18:32] <jcoxon> hehe on the pbh map they have the gps coords wrong for you rob
[18:32] <edmoore> g8khw: hi
[18:33] <edmoore> just ran a prediction - landing about 1km northwest of my first prediction
[18:33] <edmoore> central soham
[18:33] <edmoore> may not be that far north though if it's coming down faster cos a teddy
[18:34] <jcoxon> okay
[18:35] <jcoxon> i have to get some food - have been standing all day
[18:35] <jcoxon> bbl
[18:41] <rjharrison> That's what i txted steve soham
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[18:57] <edmoore> steve is walking towards it
[19:01] <natrium42> hey
[19:03] <edmoore> hi
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[19:28] <rjharrison> coo
[19:28] <rjharrison> l
[19:32] <edmoore> well, he's driving around trying to get close to it with his car
[19:32] <SpeedEvil> he's gotten local GPS
[19:32] <SpeedEvil> I.E. it's just avoiding walking, not locating it?
[19:33] <edmoore> no, it's very tough going under foot
[19:33] <edmoore> lots of large drainage ditches
[19:33] <edmoore> i have told him the nearest he can get his car
[19:33] <edmoore> ~350m, fyi
[19:33] <SpeedEvil> I mean - has gps been gotten on the ground
[19:33] <edmoore> 52.30525,0.33664
[19:38] <sbasuita> So is the GPS borked or not?
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[19:41] <edmoore> sbasuita: i think it unborked itself
[19:42] <edmoore> but it's clearly not happy
[19:43] <sbasuita> mmm
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[19:57] <natrium42> edmoore, did steve retrieve it?
[19:57] <edmoore> yes, litterally just got it
[19:57] <SpeedEvil> ::)
[19:58] <natrium42> excellent!
[19:58] <natrium42> let the debugging begin :)
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[20:00] <Laurenceb> hi all
[20:00] <Laurenceb> whats new?
[20:01] <natrium42> Laurenceb, steve just got the payload back
[20:01] <rjharrison> Camera kills GPS I'll have a wager on it
[20:01] <Laurenceb> cool
[20:01] <Laurenceb> what did it do?
[20:01] <natrium42> what camera did he have on?
[20:02] <Laurenceb> does anyone want anything from sparkfun?
[20:02] <Laurenceb> I'm going to send off an order
[20:02] <natrium42> yes, everything :D
[20:03] <Laurenceb> I was thinking UK people
[20:03] <natrium42> i think rjharrison wouldn't mind every item from sparkfun :P
[20:04] <rjharrison> ed time to kill your client
[20:04] <rjharrison> natrium42: True
[20:04] <rjharrison> Spent too much there already
[20:04] <natrium42> haven't we all
[20:04] <natrium42> :D
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[20:05] Nick change: BEN_APEX_ -> BEN_APEX
[20:05] Action: Laurenceb has spent too much time stuck on the M25
[20:05] <rjharrison> natrium42 a hd camera and I'm sure it's interfeering with GPS alt
[20:06] <rjharrison> esp as it was right under the GPS antenae
[20:06] <rjharrison> antenna
[20:07] <sbasuita> How far away does a camera need to be so that it doesn't produce harmful interference?
[20:07] <rjharrison> its a vid camera
[20:07] <rjharrison> the a560 is fine
[20:07] <rjharrison> even in vid mode
[20:07] <natrium42> rjharrison, same power source?
[20:07] <rjharrison> No
[20:07] <rjharrison> AA's in the camera
[20:08] <sbasuita> Good - the A80 should be fine.
[20:08] <rjharrison> Yep
[20:08] <rjharrison> This is unusuall and it is a guess that the cam has killed the alt but CUSF was similarly affected
[20:08] <Laurenceb> edmoore: want anything from sparkfun?
[20:10] <edmoore> not just atm thanks
[20:10] <edmoore> is the 406 back in stock?
[20:11] <Laurenceb> yes
[20:12] <Laurenceb> Im going to order a 406, two radio modems, arm7 board, arm jtag... maybe some other random stuff
[20:12] <edmoore> ok cool
[20:12] <edmoore> i think we're good for the moment, ta
[20:12] <edmoore> bbl
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[20:16] <rjharrison> what is a 406?
[20:16] <natrium42> gps module with helical antenna i believe
[20:16] <Laurenceb> yes
[20:16] <Laurenceb> ublox
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[20:17] <rjharrison> Yo james
[20:17] <natrium42> hi jcoxon
[20:19] <jcoxon> hey
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[20:28] <jcoxon> glad the payload has been recovered
[20:28] <AlexBreton> has APEX found their balloon?
[20:28] <sbasuita> AlexBreton, no
[20:28] <sbasuita> AlexBreton, there was another launch today
[20:28] <AlexBreton> oh
[20:28] <sbasuita> AlexBreton, by steve. The gps spacked
[20:29] <sbasuita> AlexBreton, was actually a lassen iq (; O), but probably because of interference from the video camera.
[20:29] <AlexBreton> oops
[20:30] <Jon_APEX> APEX is still lost :(
[20:34] <BEN_APEX> there is still hope jon
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[20:35] <sbasuita> g8khw, got your balloon?
[20:35] <g8khw> Yep got it back
[20:35] <jcoxon> g8khw, great
[20:36] <sbasuita> : )
[20:36] <sbasuita> g8khw, so any idea what broke the gps?
[20:36] <g8khw> Nope
[20:36] <Laurenceb> hi there
[20:36] <Laurenceb> altitude
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[20:40] <g8khw> Bbl
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[20:42] <Laurenceb> http://www.youtube.com/watch?v=rG9gcwy6kfc
[20:44] <sbasuita> inspired
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[21:05] <jcoxon> i'm really inspired to launch
[21:05] <jcoxon> i haven't launched for a very long time
[21:07] <Jon_APEX> Why don't you?
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[21:08] <jcoxon> Jon_APEX, oh my payload isn't working reliably
[21:09] <Jon_APEX> Ah OK. What's wrong with it?
[21:09] <jcoxon> a combination of hardware and software
[21:09] <jcoxon> really need to solder up something more stable
[21:09] <jcoxon> still semi breadboarding it
[21:09] <Jon_APEX> fair enough. hopefully you'll get it working soon :)
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[21:10] <Jon_APEX> :)
[21:10] <jcoxon> oh yeah
[21:10] <jcoxon> it'll fly soon
[21:10] <Jon_APEX> Cool
[21:10] <Jon_APEX> Full technical writeup of Apex I here:
[21:10] <Jon_APEX> http://www.hexoc.com/wb/pages/balloon-project.php
[21:10] <Jon_APEX> If anyone is interested
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[21:11] <jcoxon> good work
[21:11] <jcoxon> its an excellent payload
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[21:11] <Laurenceb> http://www.hexoc.com/balloon/images/projects-apex-i-elec.jpg
[21:11] <Laurenceb> ^ arggg
[21:12] <Jon_APEX> Haha. It looks worse than it is, promise!
[21:12] <rjharrison> Wow
[21:12] <jcoxon> hmmm there isn't going to be a window for a flight for quite a while
[21:12] <rjharrison> Jon_APEX: Nice write up
[21:12] <jcoxon> forecasts rule out next week
[21:12] <Jon_APEX> Thanks, I've tried to make it as complete as possible, for my own records as much as anything else. Hopefully it's of some use to someone
[21:14] <Jon_APEX> You guys tend to use Energizer Ultimates for power?
[21:17] <jcoxon> energizer ultimate lithium
[21:17] <jcoxon> yup
[21:17] <Jon_APEX> 4.5V? or 6V?
[21:18] <Jon_APEX> Or is that just dependent on the electronics?
[21:18] <jcoxon> depends
[21:18] <jcoxon> they often supply about 1.7v each
[21:18] <jcoxon> just need to be a little careful
[21:19] <Jon_APEX> Right OK
[21:19] <Jon_APEX> How does voltage vary with temperature?
[21:19] <jcoxon> they are the most stable
[21:19] <jcoxon> check out their datasheet about that
[21:20] <Jon_APEX> OK cheers
[21:20] <Jon_APEX> Apex II will have an ionising radiation detector onboard, so we're just trying to get power sorted
[21:21] <SpeedEvil> what sort of detector
[21:21] <rjharrison> Use a regulator with the lips to get a nice constant voltage
[21:21] <rjharrison> lips = lipos
[21:21] <Jon_APEX> We're looking at possible detector designs at the moment
[21:22] <Jon_APEX> Yeh we'll definitely have a regulator on there
[21:23] <SpeedEvil> sparkfun has a nice new regulator
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[21:24] <Jon_APEX> we normally use Maxim ones but I'll have a look at the SF one
[21:28] <Jon_APEX> What's the preferred cutdown device design?
[21:28] <SpeedEvil> from memory integrated 1-5V output, 3A, 10-14V in, $6
[21:28] <SpeedEvil> I like ceramic resiistor pulsed to its maximum specified temp of 250C or so
[21:28] <SpeedEvil> with a strip of PE pressing against it
[21:29] <Jon_APEX> OK cool
[21:30] <Jon_APEX> we used nichrome wrapped around the nylon cord for Apex I, but it was never used so we don't know if it worked
[21:30] <Jon_APEX> It worked under testing, though
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[21:31] <SpeedEvil> never used mine either
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[21:31] <SpeedEvil> I like the 'everything within limits of the datasheet' though
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[21:31] <SpeedEvil> and repeatable
[21:33] <Jon_APEX> Fair enough, seems like a good idea
[21:33] <Jon_APEX> Might try the rocket igniter idea with Apex II
[21:33] <Matt_APEX> btw, this is the radiation detector we may use http://www.maxim-ic.com/appnotes.cfm/an_pk/2236
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[21:56] <edmoore> just as a general fyi, steves payload is recovered and well
[21:56] <edmoore> he just left churchill
[21:56] <jcoxon> excellent
[21:57] <edmoore> and it's amazing what 2 pints can do to you after 6 weeks of solid revision
[21:57] <jcoxon> haha
[21:57] <jcoxon> teddy recovered?
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[22:25] <Jon_APEX> What antennas are the best for use with the lassen?
[22:27] <sbasuita> Jon_APEX, I don't know about 'best', but we're just using a patch antenna - seems to work fine. I'm not to worried about getting satellites whilst up in the sky; there aren't any obstructions.
[22:28] <Jon_APEX> Is that the patch ant that Trimble supply for use with the Lassen
[22:28] <Jon_APEX> ?
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[22:29] <Jon_APEX> http://www.dpieshop.com/trimble-miniature-33v-unpackaged-gps-antenna-hfl-connector-5785900-replacement-p-234.html?osCsid=pto387hvr9s7563i2hlj7plhh5
[22:29] <Jon_APEX> this one
[22:31] <sbasuita> Jon_APEX, that's the one iirc
[22:31] <Jon_APEX> OK, thanks :)
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[22:52] <Laurenceb> aporkalypse
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[23:01] <rjharrison_> Ping jcoxon
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[23:06] <edmoore> evening everyone
[23:06] <Laurenceb> hi ed
[23:06] <Laurenceb> you coming next thursday?
[23:07] <Laurenceb> - still
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[23:37] <edmoore> Laurenceb: yes
[23:37] <Laurenceb> cool
[23:38] <Laurenceb> does badger use the LPC2148?
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[00:00] --- Fri May 1 2009