highaltitude.log.20101109

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[00:22] <Laurenceb> anyone know somewhere to get self adhesive rubber fet?
[00:22] <Laurenceb> *feet
[00:22] <Laurenceb> about 10mm square my 1mm think
[00:29] <Laurenceb> guess i could try nicking off some old kit
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[00:44] <NigeySWales> Laurenceb, http://www.toby.co.uk/content/catalogue/series.aspx?category=75
[00:46] <Laurenceb> oh perfect
[00:46] <Laurenceb> toby is a really useful site
[00:47] <NigeySWales> :D
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[00:49] <Laurenceb> actually i have stoppers for kitchen cupboard doors
[00:49] <Laurenceb> they work nicely
[00:49] <NigeySWales> oo good thinking
[00:51] <Laurenceb> just finishing off the sdr enclosure
[00:52] <Laurenceb> main problem now if the ferrite for dcf77 has to be outside
[00:52] <Laurenceb> so its not sheilded from the rf
[00:52] <Laurenceb> needs some sort of plastic "ferritedome"
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[00:56] <Laurenceb> im thinking of running the dcf code on the pc
[00:56] <Laurenceb> and sending back tuning commands to do pll
[01:02] <SpeedEvil> hmm
[01:02] <SpeedEvil> Is there a very compelling reason to have the devices in one unit?
[01:02] <SpeedEvil> hmm
[01:03] <Laurenceb> i guess not
[01:03] <SpeedEvil> I suppose relative timestamping woul dbe tough without.
[01:03] <Laurenceb> easier to set up
[01:03] <Laurenceb> yeah if it was seperate usb
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[01:11] Action: SpeedEvil ponders.
[01:11] <SpeedEvil> You're wanting this for what - just as a frequency reference?
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[01:15] <Laurenceb> to stabilise the vcxo exactly
[01:15] <Laurenceb> as itll only be off by a couple of ppm, you have several seconds to lock in with the pll
[01:15] <Laurenceb> so offloading to the pc should work
[01:15] <Laurenceb> anyway, zzz
[01:16] <SpeedEvil> I was wondering about ntpd
[01:16] <SpeedEvil> but yeah - the problem then is the jitter over USB
[01:16] <SpeedEvil> night
[01:33] <Darkside> WHAT THE FUCK
[01:33] <Darkside> shit
[01:34] <Darkside> how the hell did i sleep in so late
[02:23] <SpeedEvil> Vampires.
[02:31] <Darkside> haha
[02:31] <Darkside> i need to make sure my alarm is loud
[02:31] <Darkside> mayve coupled with a caffeine IV
[02:32] <Darkside> mmmmmm IV caffeine
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[08:18] <Darkside> juxta_: ?
[08:19] <juxta_> hey Darkside
[08:19] <Darkside> i'm getting the netbook tonight
[08:19] <Darkside> so i'll attempt to get everything on that
[08:19] <juxta_> nice - let me know how it goes
[08:19] <Darkside> followng what you did to my laptop today
[08:19] <juxta_> i'll be back shortly, going to have some dinner
[08:19] <Darkside> ok
[08:19] <Darkside> KFC wasn't enough for you? :P
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[08:50] <earthshine> morning
[08:56] <NigeySWales> morning earthshine, what crap weather today! :(
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[09:02] <earthshine> tell me about it
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[09:24] <WillDuckworth> anyone got a *good* supplier for helium & filling kit? BOC?
[09:27] <NigeySWales> boc or liquid air products
[09:27] <russss> I think BOC is the best helium supplier, yeah
[09:28] <WillDuckworth> has anyone tried hydrogen at all?
[09:28] <russss> and the price per unit volume drops dramatically as the amount you buy increases...
[09:28] <NigeySWales> WillDuckworth, not me.. tends to blow up mind ;) lol
[09:29] <russss> I've heard of people using hydrogen, but I don't think anyone in this channel has had any experience with it
[09:29] <NigeySWales> thats the impression i got the other day
[09:29] <WillDuckworth> cool, maybe another day then ;)
[09:29] <NigeySWales> i think its just to volatile
[09:30] <WillDuckworth> i shall get onto BOC for the helium then!
[09:30] <russss> nah, I think it's fine. It's just nobody wants to risk it.
[09:30] <NigeySWales> :D
[09:30] <russss> helium isn't so expensive that people want to use hydrogen. This will probably change when the US finish selling off their national helium reserve.
[09:31] <NigeySWales> true
[09:31] <NigeySWales> is there much of a benefit to h though?
[09:31] <NigeySWales> charts i was looking at werent showing as much of a difference as id have thought
[09:34] <jerry507_mac> It's ridiculous that they're selling that reserve off
[09:39] <WillDuckworth> yep - once it's gone - it's gone.....
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[09:41] <jerry507_mac> It's a hard to get resource too
[09:41] <jerry507_mac> They're selling it off and it'll only get harder to find
[09:41] <jerry507_mac> So kids can have party balloons and other silly stuff
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[09:42] <NigeySWales> good point, how much do they have in reserve ?
[09:43] <jerry507_mac> http://en.wikipedia.org/wiki/National_helium_reserve
[09:43] <jerry507_mac> Over a billion cubic feet
[09:46] <NigeySWales> :o
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[09:53] <GW8RAK> We hear a lot about loss of animal and plant species, could He be the first element to become "extinct" on Earth?
[09:57] <NigeySWales> lets hope not, it could be replenished though, but would have to be harvested from space
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[09:59] <russss> once it's in the atmosphere it escapes into space
[10:00] <GW8RAK> In serial comms, if the mode is 8n2, are there any start bits?
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[10:14] <NigeySWales> yey some bits just turned up in the post..gps modules are kinda tiny :|
[10:21] <jonsowman> NigeySWales: what gps modules did you go for?
[10:22] <NigeySWales> lassen iq + antennae couldnt get hold of a falcom
[10:23] <jonsowman> fair enough
[10:23] <jonsowman> the lassens are good
[10:23] <jonsowman> well, I like them
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[10:24] <NigeySWales> they seem to be ok, only drawback i can see is theyre not quite as sensitive
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[10:26] <jonsowman> not really an issue on a HAB I don't think
[10:26] <NigeySWales> nope, oh i found a t68i for backup too
[10:26] <NigeySWales> so hardware wise, all ordered, pcbs are gonna take 3 weeks though
[10:27] <jonsowman> good stuff
[10:27] <NigeySWales> that was the easy part, soldering, testing, then the coding, thats the fun bit i guess
[10:28] <jonsowman> it's the more interesting bit :)
[10:28] <NigeySWales> lucky i know a good c programmer!
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[10:29] <NigeySWales> i forgot to ask james if his breakout board for the lassen addressed the voltage difference between the mega and the lassen iq
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[11:12] <juxta> ping jonsowman
[11:13] <NigeySWales> hi juxta
[11:13] <juxta> hi NigeySWales
[11:13] <juxta> how are you?
[11:13] <NigeySWales> im good, yourself?
[11:14] <juxta> not too bad - preparing some things for launch this weekend
[11:14] <NigeySWales> great :D, hows the weather looking ?
[11:15] <juxta> not the greatest at this stage
[11:15] <juxta> :(
[11:15] <NigeySWales> dammit :( got to love these autumn storms
[11:15] <juxta> we're in spring here :)
[11:16] <NigeySWales> no fair! lol
[11:17] <juxta> jonsowman, was going to mention something that's been cropping up with the predictor, has been getting stuck on 'predictor running' a bit of late. ping me when you're around and have a sec :)
[11:18] <NigeySWales> it did it to me yesterday aswell, hung on 85%
[11:18] <juxta> NigeySWales, I doubt jcoxon's board does level shifting
[11:19] <juxta> you'll have to do that
[11:19] <NigeySWales> thought as much
[11:19] <juxta> you could always use a 3.3v arduino though
[11:20] <NigeySWales> could get a uno .....
[12:07] Nick change: The-Comp1ler -> The-Compiler
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[12:24] <NigeySWales> got a t68i for a fiver on ebay, result :D
[12:26] Action: SpeedEvil should remember what that is.
[12:26] <NigeySWales> t68?
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[12:33] <SpeedEvil> yes
[12:33] <SpeedEvil> oh - right
[12:33] <SpeedEvil> I think I was pondering buying one _aages_ ago
[12:34] <NigeySWales> loads on ebay i was quite surprised
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[13:00] <eroomde> afternoon chaps
[13:06] <SpeedEvil> Afternoon.
[13:06] <eroomde> how're things?
[13:06] <NigeySWales> afternoon eroomde
[13:07] <eroomde> hi NigeySWales - all well>
[13:07] <eroomde> ?*
[13:07] <NigeySWales> yup, all good i think, trying to locate a smt socket atm .. hows you ?
[13:09] <eroomde> was going to go out this morning but it was absolutely heaving it down
[13:09] <eroomde> so I made some bread instead as we've some friends coming over for dinner this eve
[13:10] <eroomde> http://i.imgur.com/oV3QP.jpg
[13:10] <NigeySWales> oo yeah the weathers awful today :(
[13:10] <eroomde> (I got a bit carried away trying to be artistic)
[13:11] <NigeySWales> haha thats cool! nothing like home made bread!
[13:11] <NigeySWales> the smell when it's cooking mmmmm :D
[13:11] <eroomde> yeah i love baking. it's a great antitdote to heavily 'thinky' things like electronics
[13:12] <eroomde> and i love the chemistry! seeing the dough has doubled in size without you doing anything is pretty cool in a primal sort of way
[13:13] <NigeySWales> when i think of bread dough, i think of the the expansion of the universe, space itself expanding.. weird but hey im a astro geek so...lol
[13:13] <eroomde> if we bake the universe will that stop it?
[13:14] <NigeySWales> well there's a thought, if the universe were to heat up would the effects of dark energy be mitigated...
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[13:30] <dave__> is the Topic current, or a relic from yesterday?
[13:30] <dave__> meh, nick not working
[13:31] Nick change: dave__ -> Dave-M0MYA
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[13:39] <jonsowman> juxta: pong
[13:39] <jonsowman> yes it's weird, does that sometimes
[13:39] <jonsowman> it's when the binary crashes
[13:40] <juxta> heya jonsowman
[13:40] <juxta> ah right - was wondering what it was
[13:40] <juxta> :)
[13:40] <jonsowman> predict.py doesn't realise and so the JSON still say "predictor running" which is what the frontend sees
[13:40] <jonsowman> basically it needs predict.py to check if the predictor crashes and then write that to the JSON so the frontend can tell the user
[13:41] <juxta> hmm, why does the binary crash? :S
[13:41] <juxta> bad data?
[13:42] <jonsowman> mostly seems to be bad gfs data
[13:42] <Randomskk> it just does occasionally. probably bad data
[13:42] <Randomskk> theoretically I should be making predict.py catch predictor crashes
[13:42] <Randomskk> one of these days
[13:42] <Randomskk> jonsowman: shall I phone cambridge tower?
[13:42] <jonsowman> github issue! oh wait
[13:42] <Randomskk> what's our new plan? 2:30pm wednesday?
[13:42] <jonsowman> Randomskk: yes please
[13:42] <jonsowman> between 2-3pm
[13:42] <Randomskk> they like an actual time
[13:42] <jonsowman> 2pm then
[13:42] <Randomskk> okay
[13:42] <jonsowman> doesn't matter if it's a bit late
[13:42] <jonsowman> being early might confuse them though
[13:43] <Randomskk> done
[13:43] <Randomskk> got the excited lady who just said "great, that's fine, give us a call about 10min before release"
[13:44] <Randomskk> none of this asking for details stuff
[13:44] <Randomskk> then my phone rebooted
[13:44] <eroomde> yes don't worry too much about timings - even 3hrs before and 5 mins before works for them usually
[13:45] <eroomde> i.e. if at 2am one morning you decide on a wim to launch that morning, they're usually fine with that
[13:45] <Randomskk> cool
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[13:46] <juxta> jonsowman: www.bogaurd.net/ozi.jpg
[13:46] <juxta> the short green line is the path so far, the blue is the prediction
[13:48] <Randomskk> nice
[13:50] <Dave-M0MYA> folks, I'm pretty sure I know the answer already, its more just making sure before I part with more cash - it is legitimate to send my telemetry using the NTX-2 on 434.65MHZ?
[13:51] <NigeySWales> thats the 1 i bought so i guess so..lol
[13:51] <jonsowman> juxta: nice
[13:51] <Dave-M0MYA> okeydoke, prting with cash is is then =)
[13:51] <jonsowman> Dave-M0MYA: yes
[13:51] <NigeySWales> comes in a nice black plastic case to hehe
[13:51] <juxta> performance is really good with the regular GFS data (as opposed to HD)
[13:52] <jonsowman> the only issue is that there apparently some repeaters around that frequency
[13:52] <jonsowman> apparently it's better to go for the 434.075 module if you can
[13:52] <jonsowman> but don't worry too much
[13:52] <Randomskk> it's not illegal, though. just people who are for some reason running a repeater on that frequency without access tones
[13:52] <Randomskk> silly people >.>
[13:52] <jonsowman> no it's certainly not illegal
[13:52] <Dave-M0MYA> ahhhh! I really don't want to be causing QRM on repeaters
[13:52] <jonsowman> some hams have complained in the past apparently
[13:53] <Dave-M0MYA> but farnell have the .65 units, and Radiometrix seem to have naff all ATM
[13:53] <jonsowman> go for it
[13:53] <jonsowman> you're perfectly entitled to use that frequency
[13:53] <NigeySWales> i emailed radiometrix and they sold it to me direct...
[13:53] <jonsowman> and many flights have without incident
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[13:54] <jonsowman> Dave-M0MYA: it might be worth contacting RM anyway, as they might well quote a cheaper price than farnell
[13:54] <Dave-M0MYA> they do, and I did, but they seem to have no stock
[13:54] <Dave-M0MYA> I might ring them again before I press the farnell "pay" button =)
[13:54] <jonsowman> worth a shot
[13:54] <jonsowman> otherwise just go for the .650
[13:56] <Dave-M0MYA> cheers jonsowman, will do
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[13:58] <eroomde> i don't think there's any actual reported case of interference on 650
[13:58] <jonsowman> james was talking about some grumpy hams complaining once or twice
[13:58] <jonsowman> apart from that I've not heard of any issues either
[13:58] <eroomde> just you occassionally get a jumpy repeater owner worrying that 10mW 200km is going to stop him talking about his ailments with the other people TXing 5W within 10km
[13:59] <juxta> i got worried as there's a repeater on 434.650 in the next state over from me, but I've not had any complaints so far
[13:59] <eroomde> you almost certainly won't
[13:59] <juxta> agreed
[14:00] <eroomde> if you fly near RAF Flyingdales though, use .075
[14:00] <jonsowman> oh?
[14:01] <eroomde> it upsets them
[14:02] <jonsowman> ah ok
[14:03] <eroomde> jonsowman: emailed you
[14:04] <jonsowman> i have no emails... which address?
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[14:05] <jonsowman> got it thanks
[14:06] <Dave-M0MYA> sadly no NTX-2s on .075 @ radiometrix, but they do have .650. However, with carriage and all, I'd only save 1.08GBP over ordering it from Farnell with my temp. sensors :s
[14:06] <jonsowman> eroomde: interesting stuff
[14:10] <Dave-M0MYA> all, VAT fail :)
[14:10] <Dave-M0MYA> *ahh
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[14:20] <Randomskk> yaay
[14:20] <Randomskk> my new yagi has shipped after one-and-a-half months of waiting
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[14:26] <eroomde> Randomskk: what model?
[14:26] <Randomskk> it's been so long I'd forgotton. it's a diamond A430S10R 430-440MHz 10el
[14:27] <Randomskk> 13.1dBi
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[15:21] <Laurenceb_> http://www.theregister.co.uk/2010/11/09/bell_goes_on_musk_rocket_nasa_battle/
[15:21] <Laurenceb_> what the hell
[15:21] <Laurenceb_> falconXX is mental
[15:29] <russss> I wonder what the actual cost difference is between using RP-1 vs liquid hydrogen on that kind of scale
[15:30] <russss> the volume issue sucks I guess.
[15:35] <MoALTz> you'd need specially designed engines to use hydrogen. very expensive + that fuel is a nightmare to work with
[15:37] <russss> I'm assuming you're specially designing the engines regardless. SpaceX certainly is
[15:37] <russss> and they're already handling cryogenic oxygen, which is arguably more dangerous than LH2
[15:38] <MoALTz> it's safer and safer than dealing with LH2. that said, hypergolics are worse (in terms of safety)
[15:38] <MoALTz> *easier and safer
[15:47] <russss> we need a fucking space elevator already
[15:47] <russss> rockets are silly.
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[16:02] <Laurenceb_> rotovator is way easier than space elevator
[16:02] <Laurenceb_> i dont get why anyone considers space elevators
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[16:04] <Laurenceb_> in fact antanov an-225 to PBO rotovator is borderline feasible
[16:04] <Laurenceb_> and all current tech
[16:08] <russss> madness
[16:10] <Laurenceb_> or magellan M5.. if it exists
[16:17] <Laurenceb_> due to the guassian nature of the equation, you need a studpid amount of the same stuff to do a space elevator
[16:17] <Laurenceb_> or the same amount of something with twice the strenght to weight
[16:22] <NigeySWales> carbon nanotubes would do it
[16:22] <Laurenceb_> also unobtanium
[16:22] <Laurenceb_> PBO can be bought off the shelf
[16:23] <NigeySWales> true
[16:23] <Laurenceb_> but youd need 1000tonnes of it to launch 1 tonn of payload
[16:25] <Laurenceb_> but rotovator can be short and do MEXER
[16:25] <Laurenceb_> ive gtg, cya
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[16:45] <SpeedEvil> Laurenceb: Space elevators are quite feasible - if you can get to ~25% of theoretical nanotube.
[16:45] <SpeedEvil> Even 10% isn't bad - much lower is worse.
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[17:36] <jshriver> greetings everyone :)
[17:36] <SpeedEvil> hey
[17:37] <jshriver> sorry been offline a bit
[17:37] <jshriver> how you doing SpeedEvil?
[17:39] <SpeedEvil> Ok.
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[18:38] <griffonbot> @cuspaceflight: NOTAM sent out - CW beacon will be launched tomorrow 1400-1500GMT. Trackers welcomed. #ukhas #cusf [http://twitter.com/cuspaceflight/status/2067407308849152]
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[18:40] Topic changed on #highaltitude by ChanServ!ChanServ@services.: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk - CW beacon launch 1400-1500GMT on 10/11/10 from Churchill College Cambridge
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[18:49] <NigeySWales> anyone know if this would work to bring the voltage down to 3.3 for a lassen gps? .. http://www.sparkfun.com/commerce/product_info.php?products_id=8745
[18:54] <fsphil> should do the job nicely .. although if you are only rx'ing from the gps module you may not need it
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[18:55] <NigeySWales> oh? now thats confusing me, juxta said id def need to regulate the voltage :|
[18:55] <fsphil> that's right
[18:55] <fsphil> the voltage supplying the gps needs to be 3.3v
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[18:55] <fsphil> (your gps is 3.3v, and microcontroller is 5v yea?)
[18:56] <NigeySWales> yup
[18:56] <NigeySWales> mega 2560
[18:56] <fsphil> the microcontroller should accept serial levels of 3.3v
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[18:58] <NigeySWales> hmm think i need to read more
[18:58] <fsphil> but if you want to keep it simple, that adapter will work well with the serial data
[18:58] <fsphil> but you'll still need a 3.3v regulator for powering the gps
[18:59] <NigeySWales> okies, cheers :) bang goes using james's breakout board then lol
[18:59] <fsphil> ah, no regulator on it?
[19:00] <NigeySWales> nope
[19:00] <eroomde> you could easily put a 3.3v reg inline
[19:01] <NigeySWales> hmm didnt think of that, just assumed without the reg on the board it wasnt going to work
[19:02] <NigeySWales> dam the mega for being 5v !
[19:02] <fsphil> yea it can be anywhere
[19:02] <eroomde> something like a 7803 chip
[19:03] <eroomde> 3 pins: 5V in, 3.3V out. and ground
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[19:03] <eroomde> hi smea
[19:04] <NigeySWales> cheers, ill look up a stockist
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[19:10] <NigeySWales> LM3940 5V to 3.3V Voltage Regulator found that ...
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[19:57] <Laurenceb> mega2560 ?! thats some flash
[19:59] <NigeySWales> yeah
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[20:03] <Laurenceb> tbh ive never needed more than 16KB even when using fat32
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[20:05] <NigeySWales> eek
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[20:07] <Laurenceb> managed to fit a datalogger with fat32 sd card into 12kb
[20:08] <Laurenceb> most of my balloon project were <2kb, my rogallo was 15
[20:10] <NigeySWales> think i overspecced a bit..lol
[20:11] <kd0mto> Laurenceb: How big is the SD card?
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[20:22] <eroomde> jcoxon: still god for tomorrow?
[20:29] <jcoxon> hehe yes
[20:30] <jcoxon> i'm good for tomorrow
[20:31] <eroomde> oh yes
[20:31] <eroomde> whoops
[20:31] <eroomde> another q - what temperature was it in tromso when you visited, roughly?
[20:32] <jcoxon> chilly
[20:32] <jcoxon> in tromso just over 0
[20:32] <jcoxon> but 30mins out -15
[20:32] <jcoxon> its by the sea hence is warmer
[20:32] <eroomde> ok
[20:33] <eroomde> going clothes shopping tomorrow, that's all
[20:33] <NigeySWales> hi jcoxon
[20:33] <jcoxon> should be a bit warmer this time of year :-D
[20:34] <eroomde> was -10 in uppsala yesterday morning
[20:34] <jcoxon> there are big variations depending on if you are close to the sea
[20:35] <jcoxon> hi NigeySWales
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[20:36] Action: jcoxon is freezer testing the payload again
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[20:48] <NigeySWales> wireless grrrrrr
[20:51] <jcoxon> hmmm my PID controller lib doesn't seem to work with a negative setpoint
[20:53] <SpeedEvil> You mean you diddn't set it up in kelvins?
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[20:53] <SpeedEvil> Shame on you!
[20:53] <SpeedEvil> :)
[20:54] <jcoxon> hehe
[20:57] <jcoxon> its at currently -8 and hasn't turned on the heater - with a setpoint of -2
[20:57] <eroomde> the value of testing!
[20:57] <jcoxon> indeed
[20:59] <SpeedEvil> New freezer is using 1/4 of the electricity of the old one despite being 4* the volume.
[20:59] <SpeedEvil> That's what the motor not running 100% of the time does I guess. :)
[21:02] <jcoxon> oh eroomde got hellschreiber working
[21:02] <SpeedEvil> :)
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[21:10] <eroomde> jcoxon: aresome - how?
[21:14] <eroomde> also jcoxon i found in cotswold outdoor today some gloves which have a conductive weeve in the thumb and index finger tips, which mean you can use them with capacitive touch screens
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[21:15] <eroomde> which is really super cool from a hab-in-the-cold POV!
[21:15] <jcoxon> eroomde, hehe
[21:15] <jcoxon> i found that actually i was missing one pixel
[21:15] <jcoxon> hence the heavy slant
[21:16] <eroomde> ah! good spot
[21:16] <jcoxon> it was a >= not > issue
[21:16] <eroomde> fencepost error
[21:17] <jcoxon> interesting flight path
[21:17] <jcoxon> for saturday
[21:17] <jcoxon> skirt past the netherlands then off towards denmark
[21:17] <eroomde> it's like "There are only two hard problems in Computer Science: cache invalidation, naming things and off-by-one errors"
[21:17] <jcoxon> should be in radio range a lot
[21:17] <jcoxon> haha
[21:18] <fsphil> what's the odds of a dry landing on saturday?
[21:19] <jcoxon> incredibly low
[21:19] <jcoxon> odds of a fun flight - high
[21:21] <eroomde> you could team up with steve...
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[21:23] <jcoxon> on suicide flights?
[21:23] <jcoxon> i'm not to worried - want to test out a long duration + long range tracking
[21:23] <fsphil> habicide
[21:23] <jonsowman> hehe
[21:24] <jonsowman> I think Steve's tomorrow will be going in the dirnk :)
[21:24] <jonsowman> *drink
[21:24] <fsphil> looking forward to it - didn't have much luck with the hell signal last time
[21:24] <jcoxon> fsphil, will prob be going the wrong way for you
[21:24] <jcoxon> fsphil, you should register on globaltuners
[21:24] <fsphil> the cw beacon, does it have gps or is it just an ident?
[21:24] <jonsowman> fsphil: ident
[21:24] <jonsowman> no GPS afaik
[21:25] <jcoxon> okay PID controller only works with positive setpoints
[21:25] <fsphil> jcoxon, I might actually -- although I've got the online page stream thingy
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[21:27] <jcoxon> jonsowman, if only we had somewhere we could fill indoors...
[21:27] <jonsowman> jcoxon: hmm, yes
[21:27] <jonsowman> I don't know Chu well enough
[21:27] <fsphil> a big tent
[21:28] <jonsowman> eroomde: thoughts?
[21:28] <jcoxon> bbc says 11-13mph winds
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[21:32] <eroomde> no where in chu really
[21:32] <eroomde> except maybe the old oil store
[21:32] <jcoxon> sweet stabilised at 0 deg
[21:32] <jcoxon> external temp is -8
[21:32] <eroomde> that's an open-topped cube about 6m to a side
[21:32] <jonsowman> eroomde: OK, ta
[21:32] <jonsowman> isn't that where the He is?
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[21:33] <SpeedEvil> What is the diameter of a typical inflated balloon?
[21:34] <jonsowman> ~2-3m maybe
[21:34] <jonsowman> depends what size balloon
[21:34] <SpeedEvil> hmm.
[21:34] <jonsowman> probably more like 2m
[21:34] <SpeedEvil> I was wondering about ways to improvise protection
[21:34] <jonsowman> I've only ever filled 1200g and 1500g though
[21:34] <SpeedEvil> That's a bit tricky
[21:34] <jonsowman> I imagine the 3000gs are larger
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[21:37] <eroomde> jonsowman: it used to be where the He is
[21:37] <eroomde> but it's not there anymore
[21:37] <eroomde> it's in the gas bottle store
[21:37] <eroomde> finally
[21:37] <jonsowman> ah I see
[21:37] <jonsowman> I don't know the names of these places
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[21:45] <jcoxon> still holding at 0 deg, ext temp -11
[21:46] <fsphil> what's the target temp?
[22:03] <jcoxon> 1 deg
[22:03] <fsphil> hey not bad
[22:03] <jonsowman> nice
[22:03] <jonsowman> good work :)
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[22:06] <jcoxon> now its 1deg
[22:07] <jcoxon> bbl
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[22:20] <futurity> Hi, how did the launch go?
[22:20] <futurity> on Monday i mean
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[22:21] <SpeedEvil> not.
[22:21] <futurity> jcoxon: hi, did the launch go ahead yesterday?
[22:21] <SpeedEvil> Too windy.
[22:21] <futurity> SpeedEvil: thanks
[22:21] <jonsowman> futurity: launching it tomorrow if weather permits
[22:21] <futurity> i take it was too windy at ground level, but would have been ok higher up?
[22:22] <jonsowman> futurity: yes, ground weather conditions would've made filling very difficult
[22:22] <futurity> Do you have a time estimate for the launch yet or going to play it by ear?
[22:22] <futurity> or by wet finger in the air?
[22:22] <jonsowman> earliest 1400GMT
[22:22] <jonsowman> aiming for that, will probably be more like 1430GMT
[22:22] <futurity> ok, i'll try and listen in if I get chance
[22:22] <jcoxon> 0 degs at -15
[22:22] <jcoxon> :-p
[22:23] <jonsowman> it's just a CW beacon, but trackers would be welcomed
[22:23] <futurity> so no data, just a signal?
[22:23] <futurity> no co-ords?
[22:23] <jonsowman> correct, just an ident signal
[22:24] <futurity> i'm thinking of launching a balloon at some poit although not started anything yet
[22:24] <jonsowman> go for it :D
[22:24] <futurity> is the beacon there as a cheap launch payload?
[22:24] <futurity> if so it may be something i can aim for ;)
[22:25] <jonsowman> indeed, but it's worth the time and effort to make a tracker with gps telemetry really
[22:25] <jonsowman> significantly higher chance of getting it back
[22:25] <futurity> true
[22:25] <jonsowman> and makes tracking more interesting
[22:26] <jonsowman> finding it with just a beacon on board is going to be hard
[22:26] <futurity> are you looking to track it visually or directionally with a yagi?
[22:26] <jonsowman> Yagi really
[22:27] <jonsowman> though Steve has no intention of getting this one back
[22:27] <futurity> i see
[22:27] <futurity> is Steve still using PIC chips does anyone know?
[22:27] <jcoxon> yeah
[22:32] <futurity> cool. i've been meaning to speak to Steve about PICs
[22:32] <SpeedEvil> Well - a cheap mobile adds possibility to get locations if it hits land.
[22:33] <futurity> my friend is a PIC developer and i think that is likely to be the easiest path for us
[22:33] <SpeedEvil> If you've got someone to support you, that's generally a good way to go.
[22:33] <futurity> May I ask the aim of tomorrow's launch if its just a beacon?
[22:34] <futurity> i mean if we can't track its altitude or position I take it that its testing something specially?
[22:35] <futurity> Although launching anything is fun in itself :)
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[22:37] <DanielRichman> jcoxon: http://i.imgur.com/sw2aV.png
[22:37] <jcoxon> did you find my bug?
[22:37] <jcoxon> as i did
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[22:42] <DanielRichman> jcoxon: what bug :P
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[22:43] <jcoxon> fair enough
[22:43] <jcoxon> ive got my version working now
[22:44] <eroomde> how come his works and yours didn't if he hasn't fixed that bug?
[22:44] <SpeedEvil> http://www.cbsnews.com/stories/2010/11/09/national/main7036716.shtml Ok - own up - who was it?
[22:45] Action: DanielRichman didn't find a bug
[22:46] <jcoxon> there was a definitely a bug :-p
[22:47] <jcoxon> i was transmitting 1 to few pixels so each line was off by one hence the slant
[22:47] <DanielRichman> oh right I just rewrote that bit to transmit a 7x7 square
[22:47] <DanielRichman> which is what wikipedia told me to do
[22:48] <jcoxon> i'm doing 5x7 as 7x7 is a bit of a waste
[22:48] <DanielRichman> yeah I only am storing 5 out of the 7 lines
[22:49] <DanielRichman> there's an if (n > 1 || n < 5) somewhere
[22:49] <eroomde> i'm not sure you can argue over details like that being wasteful WHEN USING F*CKING HELLSCHREIBER
[22:49] <jcoxon> did you use my font then
[22:49] <DanielRichman> yeah I did jcoxon :)
[22:49] <DanielRichman> was very helpful; saved a lot of time
[22:49] <jcoxon> took my quite a while
[22:49] <jcoxon> me*
[22:49] <DanielRichman> I compressed it a bit
[22:49] <SpeedEvil> Anyway. To be truly cannonical, don't you have to use Helvetica?
[22:49] <DanielRichman> actually not that much; the morse one got compressed a bit more
[22:49] <DanielRichman> and both of them went in pgmspace
[22:50] <DanielRichman> On the other hand, I accidentally broke dominoex :-(
[22:51] <jcoxon> eeek my freezer is down to -16
[22:51] <Laurenceb> eroomde: lol wellsaid
[22:51] <jcoxon> pah DanielRichman and I are having fun
[22:51] <eroomde> it's coolness makes up for redundancy that would make shannon turn in his grave
[22:52] <juxta> morning all
[22:52] <SpeedEvil> morning
[22:52] <DanielRichman> jcoxon: with the ntx2 do you find that if you try to use the TX enable pin, when you switch tx on the frequency slides a bit like it's warming up?
[22:52] <jcoxon> yes
[22:53] <jcoxon> i leave it 3 seconds before txing
[22:53] <juxta> DanielRichman, yeah, the datasheet mentioned it takes a few miliseconds to key up
[22:53] <DanielRichman> that totally wrecked the morse & hell modes
[22:53] <DanielRichman> so instead I just send the frequency up a few khz when it should actually be "off" so that it's out of the receivers 3khz bandwidth
[22:53] <Laurenceb> yeah it swrews up mfsk64
[22:53] <DanielRichman> ugly hack :-(. I hope I can find a nicer way to do it
[22:53] <DanielRichman> juxta: takes atleast 2 seconds to settle here
[22:54] <juxta> oh wow, that's quite some time
[22:54] <juxta> how annoying
[22:55] <Laurenceb> http://ukhas.org.uk/_media/guides:waterfall.png
[22:55] <Laurenceb> you can see at the start of each packet
[22:55] <Laurenceb> i lose the first few characters, but theres only 500ms warm up there
[22:56] <Laurenceb> constant tx is the easiest way
[22:59] KingJ (~k@87-194-167-151.bethere.co.uk) left irc:
[22:59] KingJ (~KingJ-FN@95.154.197.17) joined #highaltitude.
[23:00] <jonsowman> /msg KingJ having connection issues?
[23:00] <jonsowman> oops
[23:00] <jonsowman> sorry
[23:14] <eroomde> i once gave everyone my password when i put a space before a /msg NickServ
[23:15] <jonsowman> hehe nice
[23:18] <NigeySWales> grrrrrr
[23:18] Action: NigeySWales kicks wireless
[23:26] <fsphil> now with a dodgy HF aerial: http://cube.sanslogic.co.uk/radio.php
[23:28] <fsphil> the interface is a bit ugly now -- too many buttons
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[23:30] <juxta> fsphil, awesome
[23:30] <juxta> I'm listening to BBC radio 1 :)
[23:30] <fsphil> haha
[23:31] <fsphil> I do that at work sometimes
[23:31] <juxta> how do you do the tuning? is there a library or soemthing to interface to the yaesu rig control?
[23:31] <fsphil> hamlib comes with a little command line app called rigctl
[23:32] <juxta> ah lovely :)
[23:32] <jcoxon> fsphil, you could add my online dl-fldigi
[23:32] <jcoxon> :-p
[23:32] <jcoxon> http://m6jcx.no-ip.org/dl-fldigi-XMLRPC/index.html
[23:32] <fsphil> yea the waterfall alone makes it worth it
[23:32] <juxta> ah wow that's looking really good now jcoxon
[23:33] <jcoxon> oops didn't have it on waterfall
[23:33] <jcoxon> now its working
[23:34] <juxta> what's it tuned to there jcoxon ?
[23:35] <jcoxon> my payload in the freezer
[23:35] <juxta> hehe
[23:35] <jcoxon> though some new harmonics seem to have appeare
[23:35] <jcoxon> d
[23:35] <juxta> yeah, thats what I was wondering about
[23:35] <Laurenceb> jcoxon: is that function built into fldigi?
[23:36] <jcoxon> i built it into dl-fldiig
[23:36] <jcoxon> juxta, decodes well
[23:36] <jcoxon> could be the dodgey wire
[23:36] <Laurenceb> cool, its all your work?
[23:36] <juxta> fsphil, i've released your station now ;p
[23:37] <jcoxon> Laurenceb, its a very dirty hack
[23:37] <Laurenceb> heh, very n ice tho
[23:37] <Laurenceb> well done
[23:37] <jcoxon> DanielRichman did the hack to get the waterfall png
[23:37] <juxta> agreed, it's pretty impressive jcoxon :)
[23:37] <jcoxon> seems my crystal oven is working
[23:38] <fsphil> ta - will try listening out for the cw tomorrow with this, though I won't be able to decode :)
[23:38] <juxta> awesome, that's the resistors & pid control jcoxon ?
[23:38] <jcoxon> yeah
[23:38] <juxta> nice
[23:38] <juxta> keep it stable?
[23:38] <jcoxon> steady at 0 degrees C and its -15 in the environment
[23:38] <jcoxon> its pretty stable (AFC can easily cope)
[23:38] <juxta> awesome
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[23:39] <fsphil> that signal is really weird
[23:39] <Laurenceb> how much current?
[23:39] <juxta> argh, I was hoping to have a couple of launches this weekend, but the weather seems to have other plans
[23:41] <Laurenceb> does the rig control go via fldigi?
[23:41] <jcoxon> mine setup its seperate
[23:41] <Laurenceb> nice
[23:41] <jcoxon> php and shell script
[23:41] <Laurenceb> im thinking for the sdr
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[23:42] <Laurenceb> needs an antenna rotator control :P
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[23:43] <SpeedEvil> There is an existing API
[23:44] <Laurenceb> http://www.bbc.co.uk/news/world-us-canada-11721981
[23:44] <Laurenceb> "Pentagon officials say they cannot explain reports of a missile launch"
[23:44] <jcoxon> night all
[23:44] jcoxon (~jcoxon@cpc1-lanc4-0-0-cust720.3-3.cable.virginmedia.com) left irc: Quit: Leaving
[23:44] <Laurenceb> "The Pentagon does not consider the missile a threat. "
[23:45] <Laurenceb> hmmmm
[23:45] Action: Laurenceb strokes beard
[23:45] <Laurenceb> i wonder what that tells us
[23:46] <SpeedEvil> Antenna rotator - http://cgi.ebay.co.uk/230547954116
[23:47] <jonsowman> hehe
[23:48] <juxta> pfft, this is what you need! http://www.k7nv.com/proppitch/16520580.jpg
[23:48] <jonsowman> :o
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[23:49] <Laurenceb> pah, phased array ftw
[23:49] <juxta> those things will turn a house, they're built from old airplane prop pitch motors
[23:49] <juxta> gearing does something like 10,000 rpm -> 1 rpm, hehe
[23:51] <SpeedEvil> naah
[23:51] <SpeedEvil> http://info.ee.surrey.ac.uk/Personal/L.Wood/about/dish.html
[23:52] <eroomde> night all
[23:53] <jonsowman> night eroomde
[23:53] <juxta> night eroomde
[23:53] <NigeySWales> night eroomde
[23:55] <juxta> SpeedEvil, http://serg.mountgambier.org/Recent/Jul-Dec-2008/IMG_0088.JPG
[23:56] <juxta> not entirely practical for much besides a radio telescope though
[23:56] <SpeedEvil> :)
[23:56] <juxta> http://serg.mountgambier.org/Recent/Jul-Dec-2008/IMG_0080.JPG
[23:57] <SpeedEvil> A solar cooker.
[23:57] <juxta> you'd have to be pretty dedicated to build that from scratch
[00:00] --- Wed Nov 10 2010