highaltitude.log.20090515

[00:47] <Laurenceb> http://wiki.ukhas.org.uk/code:i2c_ubx
[00:47] <Laurenceb> works nicely now
[00:47] <Laurenceb> annoyingly I cant seem to get fuse bits to reflash properly with avrdude
[00:47] <Laurenceb> maybe its my programmer... never tried it with avr dude before
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[07:42] <jcoxon> morning all
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[09:20] <stilldavid> g'night all
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[11:40] <edmoore> morning all
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[13:33] <jcoxon> hey all
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[13:53] <jcoxon> hey Laurenceb
[14:09] <Laurenceb> so your ready to launch as soon as weather is ok?
[14:10] <jcoxon> pretty much
[14:10] <Laurenceb> and so is rjharrison?
[14:10] <jcoxon> though i'm probably go for a latex floater so want really good weather
[14:10] <jcoxon> yeah, he is ready
[14:11] <Laurenceb> hmm
[14:11] <Laurenceb> I'd be interested to try the floater
[14:11] <Laurenceb> I should be ready in a few days
[14:12] <jcoxon> still working though my ideas for a floater
[14:13] <jcoxon> such as cutdown versus descent via the deflating balloon
[14:13] <Laurenceb> push harder?
[14:13] <Laurenceb> call austin powers?
[14:13] <jcoxon> hmmm
[14:37] <jcoxon> going to rebuild Pegasus VI over the weekend
[14:37] <jcoxon> need to reflash my gumstix
[14:38] <Laurenceb> good luck
[14:38] <Laurenceb> whats onboard?
[14:38] <jcoxon> oh its teh sstv payload
[14:38] <Laurenceb> nice
[14:38] <jcoxon> so powershot, gumstix, radiometrix and gm862
[14:39] <jcoxon> last time i had position data inbetween pictures
[14:39] <Laurenceb> what frequency radiometrix?
[14:39] <jcoxon> this time it'll just be pictures and will require a seperate tracker
[14:40] <jcoxon> haven't decided yet
[14:42] <jcoxon> radiometrix now have an online stoer - but don't allow you to buy all their stock
[14:42] <jcoxon> which is annoying
[14:45] <Laurenceb> can you launch weekdays?
[14:47] <jcoxon> sadly not
[14:47] <jcoxon> you can launch without me
[14:47] <jcoxon> if there is a good weekday
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[15:33] <Laurenceb> hi rjharrison
[15:33] <Laurenceb> are you able to launch on any weekdays?
[15:54] <gordonjcp> who here is based around south cambridge?
[15:57] <jcoxon> ummmm edmoore and fergusnoble, hallam as well
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[16:11] <Laurenceb> http://www.analog.com/static/imported-files/data_sheets/AD9833.pdf
[16:12] <Laurenceb> nice for a hf tx
[16:12] <Laurenceb> add a power amp and TCXO
[16:12] <SpeedEvil> so have al your recent I2C probs been shorts?
[16:14] <Laurenceb> not 100% sure
[16:14] <Laurenceb> it still restes occasionally
[16:14] <Laurenceb> it may be a bug - havent found where its hanging yet
[16:14] <Laurenceb> - the watchdog timer resets it
[16:15] <Laurenceb> its not a big problem as I just want to test the gps and radi by launching with someone else
[16:16] <Laurenceb> it may just be the I2C being noisy
[16:17] <Laurenceb> I'm running it at the absolute max speed
[16:17] <Laurenceb> and watchdog is at 500ms, so one missed packet and it resets
[16:17] <Laurenceb> happens about once a minute
[16:18] <gordonjcp> cool
[16:18] <gordonjcp> there's a guy in #hamradio who is thinking about getting his licence, who is down that part of the world
[16:19] <gordonjcp> didn't want to ask him in here directly because it's not a high altitude thing ;-)
[16:20] <Laurenceb> theres pull ups on the ublox, but I have to add extra ~2k to make it work "properly"
[16:20] <Laurenceb> oddly the ublox pulls up to 3.1v, but Vcc is 3.3
[16:21] <Laurenceb> whats the ham frequencies around 10MHz?
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[16:33] <gordonjcp> 10.1-10.15
[16:38] <Laurenceb> hmm ok
[16:43] <Laurenceb> Im thinking of making a HF transmitter board
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[16:53] <Laurenceb> can you make a opamp based rf power amp?
[16:53] <Laurenceb> for 10MHz?
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[16:58] <SpeedEvil> yes
[16:58] <SpeedEvil> but, there may well be better ways
[16:59] <Laurenceb> yeah.. impedance matching confuses me
[17:00] <Laurenceb> getting a 15V 50 ohm matched power amp for 10MHz in a single package is tricky
[17:03] <SpeedEvil> transformers
[17:05] <Bertrix> Laurenceb, look at an IRF510 mosfet.
[17:05] <Bertrix> it'll do 10Watt's on 10MHz without any problems.
[17:06] <edmoore> hi all
[17:09] <Bertrix> anyone knows good dumb gsm module. i don't need the gps,python and all the bloat in the tellit modules.
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[17:17] <Snomi> sbasuita hey
[17:17] <sbasuita> Snomi, aight
[17:17] <Snomi> sbasuita twhirl
[17:18] <sbasuita> Snomi, using twitux
[17:18] <Snomi> i know
[17:18] <sbasuita> orite
[17:18] <sbasuita> xD
[17:18] <Snomi> im usoing twhirl
[17:18] <SpeedEvil> ebay for gps module
[17:18] <SpeedEvil> some nice cheap
[17:18] <sbasuita> Snomi, cool gtg bbl
[17:18] <sbasuita> Bertrix, a mobile phone works
[17:21] <Bertrix> sbasuita, they are a bit too big. It's not for balloon use, but I imagined that this room would know alot about cellular modules
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[17:25] <SpeedEvil> err
[17:25] <SpeedEvil> ebay for gsm module
[17:25] <SpeedEvil> IIRC $35
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[17:30] <Bertrix> ty.
[17:31] <Bertrix> it seems many are availible
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[18:19] <Snomi> sbasuita
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[18:37] <Laurenceb> hmm trains question: if I have a ticket for a 9pm train, will it let me onto the platform at 7pm?
[18:38] Action: Laurenceb has a devious plan involving off peak tickets
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[18:39] <Laurenceb> hi ed
[18:40] <Laurenceb> edmoore: do you know how train tickets work? can I get through a platform barrier at 7pm with a 9pm ticket - train at 9pm
[18:40] <edmoore> if you've booked for specifically the 9pm train, i don't know
[18:40] <edmoore> if you've just got a ticket from a to b, then whenever
[18:41] <Laurenceb> I think the mag stripe is valid for the entire day
[18:45] <Laurenceb> edmoore: I was thinking of making a HF tx with the AD9833
[18:46] <edmoore> uhuh
[18:47] <Laurenceb> would need a power amp of some sort
[18:47] <edmoore> the rsgb bookshop has what you want
[18:47] <Laurenceb> an amp design?
[18:48] <edmoore> Introduction to Radio Frequency Design"
[18:48] <edmoore> Experimental Methods in RF Design
[18:48] <edmoore> I've heard they're both things you want on your bookshelf
[18:48] <edmoore> infact recommended to me by Michael Gray, KD7LMO
[18:48] <SpeedEvil> arrl books
[18:48] <edmoore> I'm still a bit shocked by that
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[19:11] <Snomi> sbasuita
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[19:21] <Laurenceb> yo
[19:22] <Bertrix> Laurenceb, in belgium you can get on the platform as long as the ticket is not expired
[19:23] <Laurenceb> hehe thanks
[19:23] <Bertrix> if you buy for like train in 2 months, and you go on tomorrow, it'll let you
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[20:06] <jcoxon> evevning all
[20:07] <rjharrison> evevning jcoxon
[20:07] <jcoxon> hey rob
[20:08] <rjharrison> working on the server
[20:08] <rjharrison> to process xml files
[20:08] <jcoxon> okay cool
[20:08] <jcoxon> shall i have a play with the gui?
[20:08] <rjharrison> that would be cool
[20:09] <rjharrison> How hard is it to get it to post the identity
[20:09] <rjharrison> Not sure how you are going to do that. Prob set a flag before fork
[20:09] <jcoxon> oh the status update?
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[20:09] <rjharrison> Yep that might be a nicer project
[20:09] <rjharrison> (quicker one)
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[23:13] <jcoxon> hey RocketBoy
[23:28] <RocketBoy> yo jcoxon
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[00:00] --- Sat May 16 2009