highaltitude.log.20110107

[00:00] <jcoxon> hey all - quick question
[00:00] <jcoxon> gps is seeing 5 sats but not getting time or lock...
[00:02] <fsphil> it could be lying
[00:02] <jcoxon> regarding the sats of the lack of a lock
[00:02] <jcoxon> $GPGSV,2,1,05,11,,,22,25,,,23,26,,,26,30,,,26*7E
[00:02] <jcoxon> $GPGSV,2,2,05,32,,,20*7F
[00:02] <fsphil> the sats maybe
[00:02] <jcoxon> my thinking is that its a signal quality issue
[00:03] <jcoxon> so it can see the sats but can't get enough info for time/lock
[00:03] <juxta> morning all
[00:03] <jcoxon> morning juxta
[00:04] <juxta> heya jcoxon - I've seen that happen a bit, a few sats in view for a little while but no lock
[00:04] <juxta> in my case it sorted itself out after a few minutes though
[00:04] <Darkside> juxta: didn't that happen on horus 8? :P
[00:04] <jcoxon> nah this is running for quite a while
[00:04] <juxta> haha, yes
[00:05] <jcoxon> but my desk is very bad for gps signals
[00:05] <juxta> oh, hmm
[00:05] <fsphil> is the number of sats changing?
[00:05] <jcoxon> it perhaps doesn't help that i've transplanted a patch antenna onto the fsa03
[00:05] <fsphil> try putting something metallic over the antenna, see if it changes
[00:05] <juxta> ooh
[00:06] <juxta> got a pic jcoxon?
[00:07] <jcoxon> fsphil, not that much change
[00:07] <jcoxon> i wonder if its got a bit stuck
[00:07] <fsphil> yea
[00:07] <fsphil> if it's still seeing sats with no chance of a signal then it might be a software problem
[00:08] <jcoxon> lets restart it...
[00:08] <jcoxon> juxta, no pics currently
[00:08] <jcoxon> only will publish if i actually get working
[00:08] <juxta> hehe, okay
[00:09] <juxta> jcoxon, we flew this rig the other day: http://i.imgur.com/3rBwh.jpg
[00:10] <jcoxon> oh wow
[00:10] <jcoxon> what is it for?
[00:10] <juxta> filming, the 'subject' was held in the middle of frame by fishing line
[00:10] <jcoxon> hehe
[00:11] <juxta> subject was a tennis ball this time around
[00:11] <juxta> worked very well, wasnt even smashed when it landed
[00:11] <Darkside> juxta: how did the video come out?
[00:11] <juxta> good I think
[00:11] <Darkside> havent seen it?
[00:11] <juxta> Chris has the SD card, he's gonna mail it back to me
[00:11] <Darkside> ahh ok
[00:12] <juxta> I had a brief look, I could see the clouds were not ideal
[00:12] <Darkside> because that frame might be the best way to launch the tux
[00:12] <Darkside> im concerned that as it goes through the atmosphere, it will absorb moisure and become heavier
[00:12] <juxta> as it was an overcast day, the clouds were super reflective
[00:12] <Darkside> and unbalance the hermes payload
[00:12] <Darkside> ahh
[00:12] <juxta> how big is it?
[00:13] <Darkside> its a 6" tux
[00:13] <jcoxon> right rebooted it, now got 4 sats
[00:13] <Darkside> i'm not sure of the weight atm
[00:13] <Darkside> hasn't arrived yet
[00:13] <Darkside> also i got an email from the head organiser from linuxconf - they love the idea
[00:13] <russss> http://spacelog.s3.amazonaws.com/a11/audio/155-AAA.ogg
[00:13] <russss> original Apollo 11 audio files
[00:13] <Darkside> they can get the print signed by vint cerf and a few of the other keynotes too
[00:13] <juxta> cool
[00:14] <juxta> so will it be stills or video then?
[00:14] <juxta> does the patch need an amp perhaps jcoxon?
[00:14] <Darkside> both, if possible...
[00:15] <Darkside> dunno how thats doable
[00:15] <Darkside> i mean, HD video is probably enough
[00:15] <jcoxon> juxta, could do
[00:15] <jcoxon> will rig up something to test it outside
[00:16] <jcoxon> if not will have a think about the transplant - is a bit dodgey
[00:17] <Darkside> impedance mismatch?
[00:18] <jcoxon> yeah thats quite a possibility
[00:18] <jcoxon> will have a play this weekend - only an experiement considering the gps is dead otherwise
[00:19] <juxta> what happened jcoxon? did the helican antenna snap off?
[00:19] <Lunar_Lander> Darkside how was Horus 13?
[00:19] <jcoxon> the ground connectors on the antenna got loose and it didn't get any sats
[00:19] <juxta> Lunar_Lander, it went well
[00:19] <jcoxon> so i removed it and transplanted a patch antenna
[00:19] <juxta> ah right
[00:20] <Lunar_Lander> that is nice to hear
[00:20] <juxta> it is a very fiddly way they conneted the antenna
[00:21] <jcoxon> will keep you updated
[00:21] <jcoxon> night all
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[00:30] <Darkside> juxta: modules paid for
[00:30] <Darkside> maurice was nice on the phone :P
[00:30] <juxta> cool :)
[00:35] <Darkside> woo and im back
[00:47] <Randomskk> sodding epoxy resin
[00:47] <Randomskk> it is the work of the devil
[00:50] <Randomskk> grumble grumble
[00:54] <juxta> I rather like it
[00:54] <juxta> though guessing working time can be a bit tricky
[00:57] <Randomskk> yes
[00:57] <Randomskk> also trying to make multilayer casts with various properties, mixing in dyes, only being able to work on it in a few hour window daily and having to work outside where it's cold
[00:57] <Randomskk> and then the final layer of course has stuff sticking out of it, making covering it nontrivial
[00:58] <juxta> wow, what are you using it for?
[00:58] <Randomskk> meanwhile various parts seem perfect but then very very very slowly change, very viscously, while you're not looking
[00:58] <Randomskk> so when you come back all the stuff has sunk to the bottom and all the colours have diffused together
[00:58] <Randomskk> or when something is firm and you put something in it then pour more on top it goes soft again
[00:58] <Randomskk> or basically grrr
[00:59] <Randomskk> I'm embedding some LEDs in it to make a nightlight
[00:59] <Randomskk> but god, the hassle. probably I should have done something in epoxy before
[00:59] <juxta> nifty
[00:59] <Randomskk> it should look pretty? I hope?
[00:59] <juxta> well, once you finish it at least :)
[00:59] <Randomskk> it has pearlescent stuff mixed in, and various cool colours, and holographic glitter and stars
[01:00] <Randomskk> but all the glitter sunk to the bottom forming a nearly opaque layer. :|
[01:00] <juxta> heh - and all made from epoxy resin?
[01:00] <Randomskk> (aka I put too much glitter in expecting it to be distributed in 3d)
[01:00] <juxta> oh, damn
[01:00] <Randomskk> (but it wasn't)
[01:00] <Randomskk> (it all sunk. ._.)
[01:00] <juxta> damn gravity
[01:00] <Randomskk> I know right
[01:00] <Randomskk> sigh
[01:00] <Randomskk> and a PCB to control it, AVR with six PWM outputs via mosfets
[01:00] <juxta> how are you coping with the smell/fumes?
[01:00] <Randomskk> https://randomskk.net/u/plight.png
[01:00] <Randomskk> working outside
[01:01] <Randomskk> previously, covering the work in clingfilm then bringing in after a few hours and placing in a warm cupboard to set
[01:01] <Randomskk> the clingfilm helps stop smell
[01:01] <juxta> ah yeah, the weather would be a real pain then
[01:01] <Randomskk> there's three metal standoffs with just the tops level with the epoxy for the board to screw into
[01:01] <juxta> probably not so bad here though, 30 degrees and sunny :)
[01:01] <Randomskk> the pcb has a lipo connector and charger, so you can run it away from the mains
[01:01] <Randomskk> bastard! it is 2C and wet here
[01:02] <Randomskk> so the epoxy won't set outdoors
[01:02] <Randomskk> but now the wires for the LEDs are sticking out I can't cover it in clingfilm and bring it in
[01:02] <juxta> ah
[01:02] <juxta> garage or similar?
[01:02] <Randomskk> and it's 1am and tomorrow is my last day at work and I can't be late, but I don't have the car so have to drive, so have up be up extra early... then I'm back to uni saturday
[01:02] <Randomskk> so can't wait any longer for it
[01:02] <juxta> how long does it take to cure btw?
[01:02] <Randomskk> but sadly that means I ended up rushing a layer which will presumably ruin everything
[01:02] <Randomskk> basically it takes whatever I didn't expect
[01:03] <Randomskk> so for most layers, it doesn't cure ever
[01:03] <juxta> haha
[01:03] <Randomskk> sometimes it looks cured then goes runny again
[01:03] <Randomskk> however today some of it cured far too quickly before I could use it, because I left it in a pot to let it cure a little before using it
[01:03] <Randomskk> left it for 30 minutes ._.
[01:03] <Randomskk> the rest of my epoxy has been curing for /days/ without getting very firm
[01:03] <Randomskk> so for the top layer I put in like, way way more catalyst
[01:03] <juxta> yeah the curing time is the tricky bit I've always found
[01:04] <Randomskk> to 'cook' it, which apparently discolours it but seeing as I'm dying it anyway...
[01:04] <Randomskk> the bastard thing might actually set quickly
[01:04] <Randomskk> it also has so much dye in the top layer for opacity that it probably won't set
[01:04] <Randomskk> so basically I think next time I do some epoxy I might go smaller
[01:04] <Randomskk> maybe embed a tiny lipo and little avr and some lights in some clear or slightly coloured/decorated resin where I just pour the whole lot in one go
[01:04] <juxta> I've never actually built anything from it
[01:04] <Randomskk> it is neat and I like being able to cast stuff, but god this was tricky
[01:05] <juxta> only ever used it as a filler/for bonding
[01:05] <Randomskk> probably very sensible
[01:05] <Randomskk> a lot of people cast stuff in it for jewelery
[01:05] <Randomskk> like I've seen PCBs epoxy'd up for cufflinks, or little jewels and things for earrings or necklaces
[01:05] <juxta> yeah - it would be cool to cast from it though, you'd get a very strong seamless result
[01:05] <Randomskk> or general kinda functionless arty stuff
[01:06] <Randomskk> but yea, if this works it should be really cool
[01:06] <Randomskk> and if it doesn't, well, lesson learnt for the next time
[01:06] <juxta> if you're casting a large amount though, doesnt it get really hot?
[01:06] <Randomskk> it is nice to go a step beyond just making electronics
[01:06] <Randomskk> uhm, maybe/
[01:06] <Randomskk> I can't say I've noticied this getting at all hot
[01:06] <juxta> even when I've done small stuff with quick curing times it gets rather hot
[01:06] <Randomskk> I haven't really touched it either
[01:06] <Randomskk> maybe it'l get hot enough that it can set even outdoors in 2C
[01:06] <Randomskk> siiigh
[01:07] <Randomskk> also the LEDs moved a bit, I'm sure, which means one of them is now covered in almost opaque blue epoxy
[01:07] <juxta> what do you make the mould from to stop it from sticking?
[01:07] <Randomskk> some weird plastic. I bought the mould for this
[01:07] <Randomskk> might be polyutherane
[01:07] <Randomskk> ah
[01:08] <Randomskk> polypropylene
[01:08] <juxta> oh right, and it just doesnt happen to bond well to it?
[01:08] <Randomskk> apparently so
[01:08] <juxta> hopefully
[01:08] <Randomskk> indeed
[01:08] <Randomskk> PCBs are on their way from seeed
[01:08] <Randomskk> so I'll solder them up in the next few weeks
[01:08] <juxta> is it tricky to make sure you dont get any air bubbles?
[01:08] <Randomskk> I suspect I'm going to regret using a QFN AVR
[01:09] <Randomskk> air bubbles seem to slowly escape. mostly it is viscous enough to not trap any when pouring
[01:09] <Randomskk> I haven't gone to any special efforts or really noticed any air bubbles at all
[01:10] <juxta> this sounds pretty cool
[01:10] <juxta> show me the final result when you finish it up :)
[01:10] <Randomskk> yea, of course
[01:10] <Randomskk> tbh probably it will just look a mess. I'm really sad about the glitter all going to the bottom
[01:10] <Randomskk> that is mega annoying=
[01:10] <Randomskk> it will hide all the coloured epoxy and all the pearly stuff
[01:10] <juxta> oh well, you'll know for next time
[01:11] <Randomskk> absolutely
[01:11] <Randomskk> also need to write the AVR code soon
[01:11] <Randomskk> should be simple enough, PWM out on six channels, randomly light/dim LEDs, a pot to set the max brightness
[01:11] <Randomskk> plan to make them twinkle/shine a bit like stars or something
[01:11] <Randomskk> who knows, maybe it'l look cool regardless.
[01:11] <Randomskk> I have my doubts right now due to the bloody glitter
[01:12] <Randomskk> maybe I'll get sanding paper and remove the top of it, getting rid of almost all the glitter >__>
[01:12] <Randomskk> that's a thought.
[01:12] <juxta> yeah that should be simple enough
[01:13] <juxta> then I guess it'll need to be polished though?
[01:13] <Randomskk> probably. apparently nail varnish makes it shiny again after sanding
[01:14] <Lunar_Lander> good night
[01:14] <juxta> hmm, interesting
[01:14] <juxta> good night Lunar_Lander
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[01:15] <juxta> I'm going to go have some late breakfast
[01:15] <juxta> good luck with it Randomskk, don't get to sleep too late :)
[01:15] <Randomskk> hah thanks
[01:15] <Randomskk> yea gonna have to go to sleep pretty soon
[01:15] <Randomskk> oh well, last day of wokr
[01:15] <Randomskk> work
[01:15] <Randomskk> then a happy fun week at cambridge before term starts :P
[01:15] <Randomskk> seeya
[01:15] <juxta> catchya later :)
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[08:01] <Upu> morning
[08:20] <Upu> fsphil http://habhub.org/predict/#!/uuid=d056f389639ec36861012f2fde699be44a745adc looks ok
[08:20] <SpeedEvil> Morning!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!111!
[08:21] <Upu> lol broken keyboard ?
[08:22] <SpeedEvil> That, or I'm trying to convince myself I'm awake
[08:28] <Upu> ah rgr houston :)
[08:54] <Laurenceb_> SpeedEvil: thanks for mentioning those parrot thingys
[08:54] <SpeedEvil> np
[08:54] <Laurenceb_> only a couple left
[08:54] <SpeedEvil> I was tempted to buy some - I got 2 as an xmas present.
[08:55] <SpeedEvil> But the chances of me using more than two are fairly small.
[08:55] <SpeedEvil> If it was a repeatable source, there could be interesting products develope for it.
[08:55] <SpeedEvil> For example - as a baseline - selling a 64M one for 25 quid.
[08:55] <Laurenceb_> yeah - not sure how good arm9 code from gcc is
[08:56] <Laurenceb_> it might be beaten by codesourcery and stm32
[08:57] <SpeedEvil> the processor is the same one (almost) in the freerunner.
[09:03] <Laurenceb_> itd be neat if spi and or i2c is avaliable
[09:04] <Laurenceb_> http://www.funcubedongle.com/?attachment_id=261 <- thats pretty awesome as well
[09:04] <Laurenceb_> seems they use a DVBT receiver - lna + pll + vco + mixer ic - thats the nda part
[09:05] <Laurenceb_> then stereo i2s microphone interface and pic24
[09:05] <Laurenceb_> very clever
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[09:21] <Laurenceb_> the maxim MAX2169 is maybe equivalent
[09:22] <Laurenceb_> most of these things are NDA
[09:36] #highaltitude: mode change '+o jonsowman' by ChanServ!ChanServ@services.
[09:37] Topic changed on #highaltitude by jonsowman!jonsowman@sheeva.hexoc.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk - HADIE 2 launch 09/01/11 ~11:00GMT
[09:37] #highaltitude: mode change '-o jonsowman' by ChanServ!ChanServ@services.
[09:39] <fsphil> not bad at all Upu, plus if it bursts later it should still hit solid ground
[09:40] <fsphil> that's a pretty quick ascent too, this balloon is going to be moving at some speed
[09:42] <fsphil> rough calculation, 98km/h
[09:42] <fsphil> eep
[09:43] <jonsowman> hi fsphil
[09:44] <fsphil> hiya jonsowman
[09:44] <jonsowman> all looking good for sunday then?
[09:44] <fsphil> so far -- heading out to get the gas today, payload is pretty much done - just tweaking
[09:45] <fsphil> predicted wind at the launch site is 8mph, so not as bad as predicted yesterday
[09:45] <jonsowman> :D
[09:45] <jonsowman> ah that's not too bad
[09:45] <jonsowman> 8mph is definitely manageable
[09:47] <fsphil> indeed - may bring a tent anyway
[09:48] <jonsowman> probably wise
[09:48] <jonsowman> just in case
[09:50] <fsphil> will have to make sure my knots are good, it's going to get hammered when it hits that fast air
[09:51] <fsphil> actually one question -- is 5km/s a reasonable descent speed for a 600g payload + 12" parachute?
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[09:54] <SpeedEvil> not unless it's coming in from orbit under a really robust heatshield.
[09:55] <jonsowman> ...
[09:55] <jonsowman> honestly zeusbot... ffs
[09:55] <jonsowman> I'll do it myself then :P
[09:55] <jonsowman> http://ukhas.org.uk/guides:parachute_sizing_chart
[09:56] <fsphil> eek
[09:56] <fsphil> 5m/s
[09:56] <fsphil> :p
[09:56] <fsphil> I looked at that but it made my head hurt :)
[09:57] <jonsowman> hehe, it seems to indicate that 12" is a little on the small side for 600g
[09:57] <fsphil> yea
[09:58] <fsphil> 5m/s is fairly fast though
[09:58] <jonsowman> yeah, still acceptable though
[09:58] <jonsowman> we aimed for 5m/s for the Apex project
[10:00] <fsphil> for the descent speed?
[10:00] <jonsowman> yeah
[10:01] <jonsowman> it is on the fast side but not dangerously so
[10:01] <jonsowman> either to the payload or to whatever it hits :P
[10:01] <jonsowman> having said that, it did squash a few plants...
[10:02] <fsphil> muhaha
[10:03] <fsphil> righty, so if it's going to fall a bit fast then I'd need to slow the ascent, get it a bit further inland
[10:03] <fsphil> http://habhub.org/predict/#!/uuid=352e3e032c1715ff72b973a30f4b4df8f3ebd8ef
[10:03] <jonsowman> that looks good
[10:03] <fsphil> that's what I'll aim for then
[10:04] <fsphil> 3 hour flight time, batteries should handle that fine
[10:05] <jonsowman> should get some really nice images from that flight :)
[10:06] <fsphil> hope so! the shots over the water should be fantastic
[10:07] <jonsowman> yep
[10:08] <fsphil> might be a bit too high for good shots of the lake district
[10:08] <SpeedEvil> Are you happy for it to land on your head at that speed?
[10:08] <fsphil> it's soft and spongy :)
[10:08] <jonsowman> I wouldn't be happy for it to land on my head at 3m/s
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[10:21] <Randomskk> the chances of a head collision are astronomically low
[10:22] <fsphil> cow collision is more likely
[10:22] <fsphil> though considering the flight path, it'll probably end up on a mountain
[10:24] <fsphil> or the sea
[10:24] <jonsowman> might hit a sheep
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[12:02] <Upu> I know it wasn't written for this but currently tracking where my McDonalds lunch is : http://ava.upuaut.net/tracker/
[12:03] <Laurenceb> my dyslexic friend is taking god for a walk
[12:11] <fsphil> brilliant
[12:12] <fsphil> ack, fancy a quarter pounder now
[12:12] <Laurenceb> also works as
[12:12] <Laurenceb> my dyslexic girlfriend says im her dog
[12:14] <Elwell> Laurenceb: did you hear about the dyslexic insomniac agnostic? stayed up all night wondering if there was a dog
[12:16] <Laurenceb> lol
[12:16] <Upu> hey fsphil I suspect i'm not going to be able to do recovery
[12:17] <Upu> you got an upto date prediction ?
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[12:19] <fsphil> np Upu - might be a good excuse for a trip over :)
[12:20] <fsphil> http://habhub.org/predict/#!/uuid=352e3e032c1715ff72b973a30f4b4df8f3ebd8ef
[12:22] <Upu> if it lands there you're not getting it back :)
[12:22] <Upu> looks like a crag :)
[12:24] <fsphil> yea, would need to call in some professional climbers :)
[12:28] <fsphil> debating taking out the canon a560
[12:29] <fsphil> though I got it cheap of ebay, still a nice little camera
[12:30] <Upu> well keeping an eye on the weather but its really bad at the moment
[12:30] <fsphil> what's it doing?
[12:30] <Upu> snowing but it's really really slippy
[12:30] <fsphil> yea, similar story here
[12:30] <fsphil> though not much snow, only a light dusting
[12:31] <Upu> no quite heavy here
[12:31] <Upu> just going to make a call shortly whether to send everyone home
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[12:34] <fsphil> aah see the snow over there on the weather map
[12:34] <Upu> dinner is on its way back!
[12:35] <Upu> (we are testing the iphone chase car tracker btw..)
[12:35] <fsphil> it's a better use than my dog walk tracking :)
[12:37] <Elwell> Upu: what app?
[12:39] <Upu> one we've written
[12:42] <Upu> we'll put it up on the app store when we are happy with it
[13:07] <Elwell> cool. keep hunting through the APRS ones but they all look crap
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[13:23] <Laurenceb> looks like my bus pirate has broken :(
[13:23] <Laurenceb> its saying there no pullup voltage
[13:23] <Laurenceb> really weird
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[14:11] <fsphil> I really must replace that router some day
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[14:24] <Laurenceb> pulling up the vpu line works.. very odd
[14:27] <m1x10> Hi trons !
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[14:44] <m1x10> Hi fsphil!
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[14:50] <m1x10> http://www.youtube.com/watch?v=uz-1-QPoohk
[14:51] <fsphil> hullo m1x10
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[14:57] <m1x10> yo
[15:03] <m1x10> fsphil: just got my orders :)
[15:23] <fsphil> sweet
[15:28] <m1x10> now I wait for your crystals
[15:28] <m1x10> so I can the 3v3 experiments
[15:28] <m1x10> so I can start*
[15:28] <fsphil> they shouldn't be far away now
[15:28] <fsphil> bbl
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[15:41] Action: Laurenceb is very confused by bus pirate
[15:41] <Laurenceb> http://dangerousprototypes.com/2009/07/27/bus-pirate-practical-guide-to-pull-up-resistors/
[15:41] <Laurenceb> "You must connect the Vpullup pin to a voltage. The pull-up resistors aren’t hard-wired to a power supply, you can apply any voltage level that’s needed"
[15:42] <Laurenceb> but on v4.x firmware i dont need to for i2c to work
[15:42] <Laurenceb> i reflashed v5.x firmware and now i do.. very odd
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[16:51] <m1x10> mhhh, I cant continue without the 7mhz crystal
[16:51] <m1x10> Im afraid of working the mcu at 16mhz with 3v3
[16:53] <m1x10> so my tests are ceased until I get the crystal :(
[16:53] <SpeedEvil> afraid?
[16:53] <SpeedEvil> The worst that happens is it doesn't work
[16:53] <SpeedEvil> It's not gonna go amok and rampage through downtown tokyo.
[16:54] <SpeedEvil> Well - unless it gets below 3.1V
[16:54] <m1x10> datasheet says 10mhz for 3v3
[16:54] <m1x10> I have at least 14mhz
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[17:13] Nick change: SpeedEvil1 -> SpeedEvil
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[18:05] <jcoxon> evening all
[18:07] <jonsowman> evening jcoxon
[18:08] <Randomskk> heya
[18:09] Action: jcoxon has broken his antenna transplant
[18:09] <jonsowman> D:
[18:13] <Laurenceb_> hi all
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[18:16] <jcoxon> http://www.sparkfun.com/products/10319
[18:16] <jcoxon> thats really quite good
[18:16] <jonsowman> oo
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[18:16] <jonsowman> I've never seen a rechargable coin cell
[18:17] <jonsowman> li-ions aren't great at low temps though
[18:17] Nick change: SpikeUK_ -> SpikeUK
[18:17] <jonsowman> neither are li-pos
[18:17] <jcoxon> true
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[18:22] <Laurenceb_> just realised canonical have offices in the same building as the conservative party
[18:22] <Laurenceb_> would be ironic if all the student socialist worker supporters were actually smashing up a linux comapny office
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[18:39] <jcoxon> hey guys, quick question
[18:39] <jcoxon> http://api.ning.com/files/VeTcdyLDnItOvMM7mNhZT5elOedggNXFkQ8lXph4hp5zUMgTO*G1REHgfTA7cIBxZVN39JcVq*SHOjeCycGKZt-4PBov5dX0/ublox16.jpg?width=721
[18:39] <jcoxon> what is the red smd part in the bottom right side?
[18:39] <jcoxon> i mean bottom left
[18:40] <Laurenceb_> maybe 0 ohm resistor
[18:40] <Laurenceb_> for a little tweaking of the matching network
[18:40] <Laurenceb_> your photo?
[18:40] <jcoxon> no
[18:40] <jcoxon> lifted
[18:41] <Laurenceb_> neat
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[18:41] <jcoxon> Laurenceb_, i'm transplanting antennas on to my 'dead' fsa03
[18:41] <Laurenceb_> ah
[18:41] <Laurenceb_> the glue is interesting, mine doesnt have it
[18:41] <jcoxon> mine does
[18:42] <Laurenceb_> im guessing it helps to stabilise the tcxo
[18:45] <Laurenceb_> the vias are sooo small
[18:45] <Randomskk> oh heck, I just realised how small they are
[18:45] <Randomskk> that's insane
[18:46] <Randomskk> http://api.ning.com/files/VeTcdyLDnItOvMM7mNhZT5elOedggNXFkQ8lXph4hp5zUMgTO*G1REHgfTA7cIBxZVN39JcVq*SHOjeCycGKZt-4PBov5dX0/ublox16.jpg for awesome high res version
[18:46] <Laurenceb_> wonder how they drill them
[18:48] <Randomskk> I guesstimate 0.04mm
[18:48] <Randomskk> more like 0.05 on average actually
[18:48] <Randomskk> half a tenth a millimeter
[18:49] <Randomskk> I reckon they drill a large hole then plate it a lot
[18:49] <Randomskk> to get thick copper
[18:49] <Laurenceb_> i guess
[18:49] <jcoxon> for the GPGSV string in nmea
[18:49] <Laurenceb_> ownder if itd be practical to use water jet drilling for vias
[18:49] <jcoxon> i'm getting a snr of 20 for the 2 sats i can pick up
[18:49] <Randomskk> 0.2mm is about the smallest you can normally drill to (8 mil)
[18:50] <jcoxon> what sort of snr is required for valid data to get say time?
[18:51] <Laurenceb_> actually that might be a really smart idea
[18:51] <Laurenceb_> probably way more practical than laser drilling
[18:52] <Randomskk> way less /awesome/
[18:53] <Laurenceb_> hmm surely someones thought of that already
[18:54] Action: Laurenceb_ ponders electrostatically directed water jet drilling
[18:56] <Laurenceb_> those look like murata inductors on the rf matching
[18:56] <Laurenceb_> - blue glue stuff over them
[18:57] <jcoxon> well my transplant currently gets 2 sats
[18:57] <Laurenceb_> the thing to the left of the 32khz xtal is interesting
[18:57] <jcoxon> but no time or lock
[18:57] <Laurenceb_> maybe baseband SAW filter... ?
[19:15] <Laurenceb_> SpeedEvil: ping
[19:15] <Laurenceb_> the parrot thingy - any ideas how the lcd is powered?
[19:22] <Laurenceb_> bah hes away
[19:23] <SpeedEvil> um
[19:23] <SpeedEvil> I'd imagine LED
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[19:26] <fsphil> I has helium! woot
[19:27] <Laurenceb_> yeah
[19:27] <Laurenceb_> but white leds take >3.3v usually
[19:27] <Laurenceb_> im wondering what the power supply setup is
[19:28] <Laurenceb_> and if lipos will work
[19:28] <SpeedEvil> I will try extyernallyu powering tonight
[19:28] <SpeedEvil> maybe
[19:29] <SpeedEvil> Just had fucking soul-destroying forms to fill in.
[19:29] <Laurenceb_> :(
[19:29] <Laurenceb_> maybe take a look at the connector with multimeter
[19:29] <Laurenceb_> im wondering if maybe it pwms the 5V supply or something
[19:29] <SpeedEvil> I have supply - I can see if it works at 4.2-3.3
[19:30] <SpeedEvil> oh - shipment was slow on parrots
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[20:22] Action: Laurenceb_ is adding automatic mixer calibration to cc* SDR firmware
[20:23] <Laurenceb_> should trim out the gain/phase imbalance between the I and Q mixers
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[21:01] <Lunar_Lander> hello
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[21:53] Action: Laurenceb_ has a use for the parrot
[21:53] <Laurenceb_> graphical interface for reflow oven
[21:54] <Laurenceb_> http://www.mrtg.org/rrdtool/gallery/index.en.html <- looks useful for the graphics - only 1MB of flash used
[21:55] <SpeedEvil> that's neat
[21:56] <SpeedEvil> upgrading to 64M might be ncie
[21:56] <Laurenceb_> yeah - surely buying the sram from farnell or whatever is easier than trying to find old ram
[21:56] <Laurenceb_> unless you have tons of old ram hanging about
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[22:00] Nick change: Burninate -> Burninate-AFK
[22:14] <SpeedEvil> ebay
[22:15] <SpeedEvil> IIRC it's just most any 512M DDR2 stick
[22:15] <SpeedEvil> Or is it DDR
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[22:18] <Wild-Wing> HI
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[22:21] <Lunar_Lander> did anyone of you, except for Tim, use the 808 camera on a balloon?
[22:29] juxta (Bogaurd@ppp203-122-193-94.static.internode.on.net) joined #highaltitude.
[22:30] <Lunar_Lander> hi juxta
[22:30] <juxta> morning
[22:30] <Wild-Wing> evening juxta!
[22:30] <Lunar_Lander> how's life on the other half?
[22:30] <juxta> so so
[22:31] <juxta> i have to go to work this morning
[22:32] <Lunar_Lander> oh ok
[22:32] <Lunar_Lander> I checked my 808 cam
[22:32] <Lunar_Lander> http://img28.imageshack.us/img28/6681/vlcsnap2011010721h52m16.png
[22:33] <Lunar_Lander> http://www.mediafire.com/?le25ee4cajzjwe2
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[22:33] Action: Laurenceb_ thought it was plane sram
[22:37] <Laurenceb_> http://www.mrtg.org/rrdtool/gallery/cubemon.png
[22:37] <Laurenceb_> ^lol
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[23:18] <Laurenceb_> done - http://pastie.org/1438762
[23:18] <Laurenceb_> its very confusing
[23:19] <Laurenceb_> basically you inject a signal at the image frequency and that code will try to cancle it out
[23:20] <Laurenceb_> interestingly they use a similar technique on the funcube dongle, but cc* has hardware mixer adjustment
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[23:41] Action: fsphil will be cleaning out bits of polystyrene for weeks :)
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[23:51] <Lunar_Lander> xD
[23:51] <Lunar_Lander> did you cut a payload box fsphil ?
[23:52] <fsphil> yep - again :) the first one was too small
[23:52] <Lunar_Lander> ah
[23:52] <Lunar_Lander> :)
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[00:00] --- Sat Jan 8 2011