highaltitude.log.20090215

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[00:26] <Laurenceb> natrium42: gorilla glue works on polyurethane foam right?
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[00:52] <natrium42> Laurenceb, yep
[00:55] <Laurenceb> thansk
[00:55] <Laurenceb> how long should I leave it for?
[01:04] <Laurenceb> - to set
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[01:33] <natrium42> Laurenceb, it should say on the package
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[02:37] <natrium42> SpeedEvil, DX order shipped, finally
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[02:42] <defy> whats up guys
[02:42] <defy> anyone here familier with ETP calculations for aviation?
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[10:08] <jcoxon> morning edmoore
[10:08] <edmoore> morning jcoxon!
[10:08] <edmoore> all well?
[10:08] <jcoxon> indeed
[10:08] <jcoxon> you?
[10:09] <edmoore> very good thanks
[10:09] <edmoore> had a decent sleep, feel much better
[10:09] <jcoxon> good good
[10:09] <edmoore> had the ball friday night so was a bit spaced on sat
[10:09] <jcoxon> oh of course
[10:10] <jcoxon> urgh bad jetstream still
[10:10] <edmoore> ain't the season
[10:10] <jcoxon> yeah but i'd expect some nice winter high pressures
[10:11] <edmoore> actually yesterday was pretty glorious
[10:11] <edmoore> went up ely cathedral
[10:12] <jcoxon> the JS was bad yesterday
[10:12] <jcoxon> hmm weds and thurs are okay next week, then bad for the weekend
[10:12] <jcoxon> oh well
[10:13] <edmoore> there are lots and lots and lots of very god KDE apps, it seems
[10:13] <jcoxon> yeah
[10:13] <jcoxon> and they can work natively on mac os x
[10:13] <jcoxon> :-)
[10:14] <edmoore> exactly
[10:15] <defy> hey guys, hows things
[10:15] <edmoore> wow
[10:15] <edmoore> it's like 2005
[10:15] <jcoxon> hey defy
[10:15] <edmoore> great thanks defy - how are you!?
[10:15] <jcoxon> was going to ping you, saw you in the logs
[10:15] <defy> pretty good, same old
[10:16] <defy> you guys launched any lately?
[10:16] <edmoore> not in the last 2 months
[10:16] <edmoore> but there was lots of activity up to christmas
[10:16] <defy> cool
[10:17] <jcoxon> edmoore, we haven't lost any of the last 10 launches
[10:17] <edmoore> touch wood
[10:17] <defy> 10
[10:17] <defy> ?
[10:17] <jcoxon> we are getting better it seems
[10:17] <defy> wow i think the last time i was here the last launch was lost
[10:17] <edmoore> Nova 2 was the last one we lost
[10:17] <defy> what computer platform are you using these days
[10:18] <edmoore> we're on 10 now
[10:18] <jcoxon> defy, we've done some cool things - managed to transmit images using sstv
[10:18] <defy> for the payload
[10:18] <edmoore> defy: we use an ARM7 based one
[10:18] <defy> cool
[10:18] <jcoxon> edmoore, Nova 3 doesn't count
[10:18] <edmoore> jcoxon: i don't think an orange is a payload, really :)
[10:18] <defy> lol
[10:19] <jcoxon> hehe
[10:19] <edmoore> defy: we put some people into space - http://www.srcf.ucam.org/~cuspaceflight/images/nova9selected/teddies5.jpg
[10:19] <defy> that was you guys? i saw those photos, thats awesome
[10:20] <edmoore> yeah, at the beginning of december
[10:20] <defy> nice work
[10:20] <edmoore> cuspaceflight.co.uk for more general photos and stuff
[10:20] <jcoxon> defy, i'm still using gumstixs
[10:20] <defy> sweet, i still have all my gear, waiting for some time off to do something with it
[10:21] <jcoxon> definitely
[10:21] <jcoxon> did everyone have a good valentines day?
[10:21] <edmoore> no - tess was hard at work on her law exams
[10:22] <edmoore> so we're defering to next weekend (also my b-day)
[10:22] <jcoxon> oh
[10:22] <jcoxon> thats much better
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[10:22] <jcoxon> everywhere was tres couply
[10:23] <edmoore> yeah - I heard lots of complaints about that :)
[10:23] <jcoxon> getting reservations was a nightmare
[10:23] <edmoore> jcoxon: did you ever get round to seeing the BLAST! documentary?
[10:23] <jcoxon> hi nickname, welcome to #highaltitude
[10:23] <jcoxon> edmoore, yeah, it was excellent
[10:23] <nickname> good morning jcoxon
[10:24] <nickname> :-) i'm no newcomer just xenion ^^
[10:24] <jcoxon> oh right :-p
[10:24] <edmoore> did you see the very nice real time data graphing/telemetry application they were using on their array of screens?
[10:24] <nickname> but good morning to all of you :D
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[10:24] <jcoxon> edmoore, yeah
[10:24] <edmoore> kst.kde.org
[10:25] <edmoore> written by the prof from toronto
[10:25] <edmoore> the christian one
[10:25] <defy> i was suppose to take my girl for a fly but weather was crap
[10:25] <jcoxon> edmoore, thats soo cool
[10:25] <defy> so we sat at home and watched tv for valentines day
[10:25] <edmoore> yep
[10:25] <nickname> :-)
[10:25] <jcoxon> thought of a way of intergrating that?
[10:25] <nickname> hu why nickname again ?
[10:25] <edmoore> am going to try
[10:25] <edmoore> try*
[10:26] <jcoxon> defy, we went for dim sum in china town, then the national gallery then home - twas a good day
[10:27] <defy> sweet
[10:27] <defy> i got some high altitude (probably not by your standards, but high for us ;) video of new zealand if you guys are keen, took it at the end of last year http://www.vimeo.com/2248282
[10:28] <jcoxon> amazing
[10:29] <edmoore> is NZ in the polar vortices?
[10:29] <jcoxon> i don't think so
[10:29] <jcoxon> i could run a hysplit if you want
[10:30] <edmoore> still, would be cool to see if hyplit reconned you could circumnavigate
[10:30] <edmoore> yeah
[10:30] <jcoxon> give me a sec
[10:30] <edmoore> defy: cool video!
[10:30] <defy> i think they do affect us to an extent
[10:30] <defy> pretty much everything down south affects our weather
[10:30] <jcoxon> defy, can i have some rough gps coords of your position
[10:31] <defy> jcoxon of that video? i think i linked the coords in my youtube version, holdup
[10:31] <jcoxon> oh just your position
[10:31] <edmoore> defy: if they do, you are duty bound to build a zero pressure and circumnavigate
[10:31] <jcoxon> was going to run a forecast model on where you are
[10:32] <defy> edmoore haha, a what?
[10:32] <jcoxon> edmoore, you fill him in i'll run the model :-p
[10:33] <edmoore> defy: a zero pressure balloon - a giant bin bag with a whole in the bottom
[10:33] <edmoore> as it escends, the helium bubble inside expands
[10:33] <defy> -37.045523°,175.656525°
[10:33] <edmoore> this continues until the bubble reaches the whole in the bottom, and starts to come out slightly
[10:34] <edmoore> at this point, the balloon starts to loose lift until the lift becomes exactly neutral
[10:34] <edmoore> and it holds an altitude
[10:34] <edmoore> this means you can stay up for days
[10:34] <defy> interesting
[10:34] <edmoore> sitting in the polar winds
[10:34] <defy> at what kind of altitudes?
[10:34] <edmoore> any
[10:35] <defy> so you can control the altitude based on how loose/tight the outside bag fits?
[10:35] <edmoore> nasa use them to take experiments up to 38km for two weeks. we were planning on doing a transatlnatic attempt with one, at about 15km for 3 days (in the jet stream)
[10:35] <edmoore> so you design the balloon envelope with a specific volume, and you know the mass of the payload. with that info, you can calc the float altitude
[10:36] <defy> how would you communicate with it? sat data?
[10:36] <edmoore> there is day/night variation with solar heatings, but it's not too significant
[10:36] <edmoore> yes, though we were just planning on letting it communicte with us one way
[10:36] <defy> sounds expensive :P
[10:36] <jcoxon> interesting...
[10:37] <jcoxon> if you launched today now
[10:37] <jcoxon> http://flickr.com/photos/jcoxon77/3281213098/
[10:37] <defy> only thing with nz is that there is a lot of controled airspace around
[10:38] <defy> especially at the higher altitudes, everything is controled
[10:38] <edmoore> fly above it :)
[10:38] <defy> heh, there is no above it :P
[10:38] <edmoore> actually blue is unhelpful for that
[10:38] <edmoore> right in controlled airspace
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[10:38] <defy> thats not to say you can't fly in it, you just have to get clearance
[10:40] <jcoxon> but once we got out of controlled airspace...
[10:40] <jcoxon> blue is pretty good
[10:40] <defy> do you guys put transponders on your balloons?
[10:41] <edmoore> not for aircrft
[10:42] <jcoxon> i'll run a few more forecasts...
[10:42] <defy> i still want to get my glider up to some good heights one day, i pulled it out of the closet the other day and booted it up, everything still works well
[10:44] <jcoxon> hmmm hysplit has decided to die
[10:44] <jcoxon> will try later
[10:46] <jcoxon> edmoore, have you got teh kde apps working on your mac?
[10:46] <defy> im off to bed guys, cya round :)
[10:47] <edmoore> not yet, just ubuntu
[10:47] <jcoxon> cya defy
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[10:47] <jcoxon> am install the libs right now
[10:47] <edmoore> macports failed to build it all, for me
[10:47] <jcoxon> am using the dmgs
[10:47] <jcoxon> http://mac.kde.org/?id=download
[10:48] <edmoore> the whole lot?
[10:49] <jcoxon> installing?
[10:49] <jcoxon> i've done the base and support
[10:50] <edmoore> will throw in Qt too
[10:51] <jcoxon> downloading that
[10:51] <jcoxon> right now
[10:51] <edmoore> it's not the fastest connection
[10:51] <edmoore> 500kbps...
[10:51] <edmoore> kBps*
[10:51] <jcoxon> i'm getting 241kbps
[10:51] <edmoore> i'm used to like 5MB/s on this connection :)
[10:51] <jcoxon> haha
[10:52] <edmoore> i swear this room has dodgy grounding
[10:53] <edmoore> my radio occassionaly just turns on or off
[10:53] <jcoxon> rocketboy got his ft817
[10:54] <edmoore> cool
[10:55] <jcoxon> he is building an ATU and antenna now
[10:55] <edmoore> i think my mbp might need a hdd upgrade
[10:55] <edmoore> getting into the final stretch of the 120GB one
[10:56] <edmoore> might go for like 320 and be done with it
[10:56] <jcoxon> wow
[10:56] <jcoxon> i'm so used to having 30gb i've really conservative
[10:56] <edmoore> yeah - i quite like having all the data from previous balloon flights on
[10:56] <edmoore> + windoze xp
[11:02] <rjharrison> .
[11:02] Last message repeated 1 time(s).
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[11:03] <jcoxon> good morning rjharrison
[11:03] <edmoore> ok, tis all installed
[11:04] <jcoxon> beat me
[11:08] <jcoxon> works well
[11:09] <edmoore> now for kst
[11:09] <edmoore> have you found a bin for it?
[11:10] <rjharrison> morning all
[11:10] <rjharrison> Looking after tyhe kids and going to a local ham rally today
[11:10] <rjharrison> Lots of toys :)
[11:10] <edmoore> lucky them :)
[11:11] <rjharrison> I'm going to dump the kids at my mums
[11:11] <rjharrison> How is CUSF getting on
[11:12] <edmoore> went to see chris bishop yesterday to get some measurements for the rocket motor
[11:12] <rjharrison> Cool
[11:12] <edmoore> being a director of microsoft research is obviously the career to go for....
[11:12] <rjharrison> The solid type
[11:13] <edmoore> it's solid, yeap
[11:14] <rjharrison> wow that's going to be a big one then. Are you guys going to have a go from ears?
[11:14] <jcoxon> edmoore, i reckon i could compile it
[11:14] <edmoore> we might try and ground launch from there if we can get permission, but we'd easily break the normal upper flight cap
[11:14] <edmoore> jcoxon: if you do, shout!
[11:15] <edmoore> we're going to do a static test there soon
[11:15] <jcoxon> edmoore, also it'll give you more control of the code itself
[11:15] <rjharrison> measure thrust and burn time etc..
[11:15] <edmoore> jcoxon: indeed, that'd be ideal
[11:15] <rjharrison> You getting sponsorship for the engine?
[11:15] <edmoore> rjharrison: yes - and to see wghether or not it explodes
[11:15] <rjharrison> hehe
[11:16] <rjharrison> expensive fire work
[11:16] <edmoore> rjharrison: i think microsoft is kindly paying for the engine
[11:16] <rjharrison> cool sponsor
[11:16] <edmoore> i.e. chris bishop is
[11:16] <rjharrison> you'll have to me nice to Micro$oft now
[11:17] <edmoore> nah
[11:17] <edmoore> i don't think he's too bothered :)
[11:21] <rjharrison> edmoore, how much work did you do for the Advanced Licence ?
[11:22] <rjharrison> Assuming you knew the electronics
[11:22] <edmoore> about 50 mins
[11:22] <edmoore> don't recommend that as a strategy
[11:22] <rjharrison> No
[11:22] <rjharrison> I'll take a little lkonger
[11:22] <edmoore> had actual work deadlines to do up till then
[11:27] Action: jcoxon is compiling...
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[11:48] <fergusnoble> rjharrison_: have you tested your slim jim?
[11:51] <rjharrison_> yep
[11:51] <rjharrison_> I was testing it yeatersday
[11:51] <rjharrison_> Once again seened to be working well at about 20 miles from house
[11:52] <rjharrison_> That is line of site
[11:57] <edmoore> so from very basic sums, if your balloon is at 30km, the peak radiation of a vertically down-pointing slim jim is about 170km away, and for the j-pole is about 50km away
[11:57] <edmoore> if that's any use to anyone
[11:59] <jcoxon> :-)
[12:08] <jcoxon> now i remember why i dislike Qt
[12:08] <edmoore> what's up?
[12:08] <jcoxon> having annoying compiling issues
[12:08] <jcoxon> so close yet still not there
[12:14] <fergusnoble> edmoore: ping
[12:14] <fergusnoble> jcoxon: why do you want qt on your mac :p
[12:15] <fergusnoble> rjharrison_: do you think it would work if there was a pcb next to the j matching section?
[12:16] <fergusnoble> edmoore: could you send me your radiometrix package?
[12:18] <jcoxon> fergusnoble, ed and I were getting KST working on mac os x
[12:18] <jcoxon> kst*
[12:18] <jcoxon> but its having linking difficulties
[12:19] <fergusnoble> cool
[12:19] <jcoxon> linking ../../lib/libkstapp.1.0.0.dylib
[12:19] <jcoxon> ld: library not found for -lkstwidgets
[12:19] <fergusnoble> im sure you can do the same stuff with matplotlib but it might be more hastle
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[12:20] <fergusnoble> hassle
[12:31] borism (n=boris@195-50-197-158-dsl.krw.estpak.ee) got lost in the net-split.
[13:32] <edmoore> fergusnoble: back
[13:32] <fergusnoble> edmoore: can you send me the radiometrix package?
[13:32] <edmoore> coming right up
[13:33] <edmoore> oh it's on windows
[13:33] <edmoore> give it 2 mins
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[13:39] <edmoore> fergusnoble: sent
[13:39] <fergusnoble> edmoore: thanks :)
[13:39] <fergusnoble> any progress on badger2?
[13:40] <edmoore> as we speak
[13:40] <edmoore> on that point, have you heard from henry in the last 24 hrs?
[13:48] <SpeedEvil> Skydives Ending Badly: A parachutist who was part of an Army ceremony at Fort Riley, Kan., in July was blown 50 yards off course and crashed into the band, injuring three musicians and destroying two tubas. [WIBW-TV (Topeka), 7-17-08]
[13:53] <fergusnoble> edmoore: yeah i was working with him last night
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[14:32] <jcoxon> edmoore, ping
[14:32] <edmoore> sorry on phone for aaages. keep talking
[14:33] <edmoore> may be slow to reply though
[14:33] <jcoxon> kst is being annoying
[14:33] <jcoxon> our Qt version is too high for the 1.7 version
[14:33] <jcoxon> and v2 is being an arse to compile
[14:34] <jcoxon> will send an email to their mailing list
[14:34] <edmoore> ok cool. saw that it wasn't compatitble with that new qt.
[14:34] <edmoore> tis annoying
[14:35] <jcoxon> its being annoying as its trying to link to a library it hasn't yet built
[14:36] <edmoore> just to play, i got it from a debain repo. but agreed it would be good to get the source compiling
[14:36] <jcoxon> oh i'm compiling it on mac :-)
[14:36] <edmoore> well, make note of the steps :)
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[16:16] <rjharrison_> edmoore: how did you work out the range o fthe slim jim?
[16:46] <edmoore> rjharrison_: not the theoretical range, it's just the rnage which i on the 'peak' of the lobe
[16:46] <edmoore> it's a rough estimate
[16:47] <edmoore> so you just need to know the angle that the peak of the lobe is on, then it's just basic trig
[16:48] <fergusnoble> edmoore: hows badger2?
[16:50] <edmoore> nother few hrs - freed up tomorrow to try and finish it. just completing management coursework now to that end. Can get it on the same order as the gps
[16:51] <fergusnoble> sweet
[16:51] <fergusnoble> the rocket board is getting there
[16:52] <fergusnoble> done almost everything but the gps side
[16:52] <edmoore> do you know the breakdown of the pcb estimate?
[16:52] <edmoore> ok - you mentioned doing waveguide sums for the gps - still doing that?
[17:00] <edmoore> as i've not laid down tracks for the gps rf end yet
[17:00] <edmoore> as just going to go as per ublox guide
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[17:03] <edmoore> i'm beginning to appreciate why progress was pretty slow for CUSF last year, with most people being 3rd year engineers. It's a pretty relentless year compared to others. Can't wait for 4th year!
[17:08] <jcoxon> :-)
[17:09] <fergusnoble> edmoore: yeah ive done a coplanar waveguide for the radiometrix on the rocket board just to try it out
[17:09] <fergusnoble> not done the rf end yet but coplanar waveguide is the way to go
[17:09] <fergusnoble> better than microstrip
[17:10] <edmoore> ok, well if you either tell me how to calc, or have off the shelf dims for a 4-layer, gimme a shout
[17:11] <fergusnoble> http://www.eecircle.com/applets/015/Gcpw.html
[17:12] <edmoore> neat
[17:12] <edmoore> thanks
[17:12] <fergusnoble> eps_r is about 4.5
[17:12] <jcoxon> oooo just heard some packet on 144.800
[17:12] <fergusnoble> h depends on your stackup
[17:12] <edmoore> sure
[17:12] <edmoore> i can get all the figures for that lot
[17:12] <edmoore> what about solder resists?
[17:13] <fergusnoble> doesnt make enough of a difference i dont think
[17:13] <fergusnoble> eps_r isnt tightly controlled for cheap boards
[17:13] <edmoore> ok fair does
[17:16] <jcoxon> ooo its aprs
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[17:53] <fergusnoble> hallam: rocket board is getting there
[17:53] <hallam> hey
[17:53] <hallam> yay
[17:53] <fergusnoble> done most of the digital side
[17:53] <fergusnoble> its looking sweet
[17:53] <hallam> would you like to use my laptop?
[17:53] <fergusnoble> wont need it for a bit
[17:54] <fergusnoble> ive just put in vias where i need power
[17:54] <hallam> remember to do your work as well
[17:54] <fergusnoble> but you can come over if you want to help
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[17:54] <fergusnoble> do you really think we want a decoupling cap on every pin of the lpc?
[17:55] <edmoore> at me?
[17:55] <edmoore> oh hallam
[17:55] <hallam> it's best practice I think
[17:55] <hallam> how many are there?
[17:55] <hallam> it's not like it's difficult to do
[17:55] <edmoore> depends on the size of the grounds around it really
[17:55] <fergusnoble> 9
[17:55] <hallam> maybe two nearby ones can share?
[17:55] <fergusnoble> yeah, i will put in as many as possible
[17:56] <hallam> the PIC33 had 5 I think, and I put one on each
[17:56] <fergusnoble> .1u?
[17:56] <hallam> just 0603 or 0402 0.1uF
[17:56] <hallam> they hardly take up any space and it's really easy to route them with 4 layers
[17:56] <fergusnoble> yeah i know
[17:56] <edmoore> 0402 are crap to solder
[17:56] <fergusnoble> not too bad ed
[17:57] <hallam> nah you just need slightly magnetised tweezers
[17:57] <fergusnoble> but anyway, i dont think we can do that thing we talked about where we use the spi output of the bf with a second spi port on the lpc
[17:57] <hallam> no?
[17:57] <edmoore> i had a painful experinece at school - i think it might have been the solder and having dodgy boiling flux, but they kept flying off the board
[17:57] <edmoore> it was like soldering fleas
[17:57] <fergusnoble> yeah, it turns out the spi and second ssp ports share pins
[17:57] <hallam> it takes practice and it's annoying at first
[17:57] <fergusnoble> which is fucking stupid
[17:57] <hallam> oh that's a pity
[17:57] <hallam> could we put it into an SSP port instead?
[17:58] <fergusnoble> no, its being used by the accelerometer
[17:58] <rjharrison_> edmoore: thanks for the info on the range calc.
[17:58] <fergusnoble> anyway, im sure it will be ok with just the uart?
[17:58] <edmoore> np - not very scientific
[17:59] <hallam> oh bother
[17:59] <hallam> yeah I guess just the UART is fine
[17:59] <hallam> it does limit the video framerate
[17:59] <hallam> but never mind
[17:59] <hallam> the jpeg compressor probably can't keep up with it anyway
[18:00] <fergusnoble> ok, cool
[18:00] <fergusnoble> the accelerometer has a 12bit dac onboard
[18:00] <rjharrison_> On and off today, playing dad
[18:01] <fergusnoble> so ive put in an option to route that to the radiometrix instead of the arm dac
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[18:01] <fergusnoble> (arm is only 10bit)
[18:01] <hallam> makes sense
[18:02] <fergusnoble> and i made the radiometrix track a coplanar waveguide which should help reduce interference
[18:02] <hallam> funky
[18:02] <hallam> sized for 4 layer?
[18:02] <hallam> that makes the track thinner, right?
[18:02] <hallam> hm
[18:03] <hallam> do you think we should try out the smaller SMT radio module on this board?
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[18:03] <fergusnoble> yeah its sized for the stackup were were thinking of
[18:03] <fergusnoble> it uses the inner groundplane as its grounplane to reduce the width a bit
[18:04] <fergusnoble> but the track is 55mil so pretty wide
[18:04] <hallam> you have been busy
[18:04] <fergusnoble> we just need to remember to cut a hole in the inner power plane in that area
[18:04] <jcoxon> oooowowowowoww
[18:04] <jcoxon> got CW on 40m
[18:06] <hallam> DX?
[18:06] <jcoxon> i'm just listening
[18:06] <jcoxon> got some 10m wire and attached it
[18:17] <jcoxon> hmmm was the best way to identify baud rate etc?
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[18:19] <fergusnoble> brb
[18:24] <jcoxon> gordonjcp, ping
[18:25] <gordonjcp> jcoxon: pong
[18:25] <jcoxon> i've wacked in some wire to get 40m :-)
[18:27] <gordonjcp> cool
[18:27] <gordonjcp> any success?
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[18:27] <jcoxon> i was wondering for any tips?
[18:28] <gordonjcp> in what sense?
[18:28] <jcoxon> well is there a particular region of the band that i should use
[18:28] <jcoxon> the bandplan doesn't say much
[18:28] <gordonjcp> well the amateur radio allocation is from 7000 to 7200kHz
[18:28] <gordonjcp> PSK is mostly all around 7040-ish
[18:30] <jcoxon> voice wise up near 7200?
[18:32] <gordonjcp> yup
[18:32] <jcoxon> lots of music?
[18:33] <jcoxon> strange
[18:33] <gordonjcp> well, I think voice is 7043 and up
[18:33] <gordonjcp> oh, there are commercial stations in the 7MHz band, but they're getting kicked out later this year
[18:33] <gordonjcp> we're secondary users between 7100 and 7200
[18:35] <jcoxon> yeah they seem to be what i'm picking up
[18:38] <jcoxon> i'll keep playing around
[18:39] <gordonjcp> PSK is good fun
[18:40] <jcoxon> i need to make a cable to go from my 'puter to the radio
[18:40] <jcoxon> only receiving right now
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[18:54] <SpeedEvil> http://tech.slashdot.org/article.pl?sid=09/02/13/2039222
[18:54] <SpeedEvil> encoding data in variable polarisation
[19:00] <fergusnoble> back
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[19:21] <fergusnoble> hallam: if your not busy could you source the TCXO?
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[19:23] <hallam> hey
[19:23] <hallam> sure
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[19:37] <fergusnoble> ive put ground between the high speed traces to try and prevent crosstalk
[19:45] <hallam> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=535-9615-1-ND I think this is probably the best bet
[19:45] <hallam> I know it's VC, but we can just fix that with two resistors
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[20:01] <Laurenceb> hello folks
[20:01] Action: Laurenceb has the mini rogallo ready for launch
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[20:03] <natrium42> cool
[20:03] <natrium42> so this weekend?
[20:03] <Laurenceb> hmm
[20:03] <natrium42> do it, do it, do it
[20:03] Last message repeated 1 time(s).
[20:03] <natrium42> :)
[20:03] <Laurenceb> I'd like to launch as a secondary payload
[20:03] <jcoxon> urgh weaher is bad
[20:03] <Laurenceb> yeah
[20:04] <Laurenceb> gorilla glue is really nice
[20:04] <Laurenceb> pity it takes so long to set
[20:04] <natrium42> yep, i usually only use it for structural joints
[20:04] <natrium42> hot glue otherwise
[20:04] <Laurenceb> I've used it to fix in the door seal
[20:05] <Laurenceb> and the servo
[20:05] <Laurenceb> then hot glue for the tronics
[20:07] <Laurenceb> I'm a bit worried the optimised descent code will explode...
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[20:07] <Laurenceb> not sure if I should remove it
[20:08] <jcoxon> hey G8KHW
[20:13] <Laurenceb> I've fully enclosed the servo - theres just 2mm holes for the nylon line that controls the wing tilt
[20:14] <Laurenceb> so it should be nice at warm - at least 30C above ambient at STP
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[20:15] <Laurenceb> - however if the servos running at full power its going to go up in flames pretty quick
[20:20] <Laurenceb> theres a thermal fuse to make sure that doesnt happen
[20:36] <Laurenceb> bbl
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[22:47] <Laurenceb> back
[22:47] <natrium42> \o/
[22:47] <natrium42> party time
[22:48] <natrium42> Laurenceb, i am making a board with ATmega2560 :)
[22:48] <natrium42> it's a nice little mcu
[22:48] <Laurenceb> neat
[22:49] <Laurenceb> IMO its a bit big
[22:49] <natrium42> 4 UARTs
[22:49] <natrium42> you mean the size?
[22:49] <Laurenceb> resources/core ratio is too high
[22:49] <Laurenceb> yes
[22:49] <natrium42> perhaps
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[22:49] <Laurenceb> depends what your making
[22:50] <natrium42> i could use switches to switch between UARTs
[22:50] <Laurenceb> they've made a few micro sats powered by it here
[22:50] <natrium42> but it's easier to use that micro instead
[22:50] <Laurenceb> so called pcb sats
[22:51] <Laurenceb> ~10cm square and 3mm thick
[22:51] <natrium42> it's good for that :)
[22:51] <natrium42> low power requirements too
[22:52] <Laurenceb> yeah, that was their goal
[22:52] <natrium42> mine too ;)
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[22:53] <natrium42> edmoore!!!!!!!!!!!!!!!!!!!
[22:53] <edmoore> yo
[22:53] <natrium42> sups?
[22:54] <edmoore> not much, just went out for someone's b-day, going to hit some coursework then have an early night
[22:54] <edmoore> u?
[22:54] <natrium42> preparing my pcb order from goldphoenix
[22:54] <natrium42> got any pcb design ready?
[22:55] <natrium42> might squeeze it in
[22:55] <edmoore> i think we're doing a pretty big and comprehensive one ourselves soon
[22:55] <Laurenceb> did you get my radio in?
[22:55] <edmoore> your radio?
[22:55] <Laurenceb> pcb
[22:56] <Laurenceb> brb phone
[23:13] <Laurenceb> bk
[23:14] <Laurenceb> natrium42: can you sign me up for one of your board?
[23:14] <Laurenceb> *s
[23:15] <natrium42> Laurenceb, yep, will do
[23:15] <natrium42> how many pieces do you need?
[23:16] <Laurenceb> two
[23:16] <Laurenceb> well I was thinking a complete one, how much do you want per board?
[23:16] <natrium42> kk
[23:16] <natrium42> dunno, will figure it out
[23:16] <natrium42> bbl, tennis
[23:16] <Laurenceb> ~$30 or something?
[23:16] <natrium42> probably less
[23:16] <Laurenceb> thats cool :P
[23:17] <natrium42> i need to get a quote from them first
[23:17] <Laurenceb> thanx, enjoy the tennis
[23:17] <natrium42> ty, later
[23:20] <natrium42> Laurenceb, forgot to ask
[23:20] <natrium42> it's ok if the PCB is thinner than the usual, right?
[23:20] <natrium42> my main project needs 0.6 mm thin pcb
[23:20] <natrium42> and it's going to be gold plated
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[00:00] --- Mon Feb 16 2009