highaltitude.log.20080915

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[01:06] Action: Laurenceb_ has almost finished the mini rogallo airframe
[01:06] <Laurenceb_> just needs the "gondola" connecting to the wings
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[01:07] <Laurenceb_> hi phatmonkey
[01:08] <Laurenceb_> edmoore: is your ARM on the badger board big or little endian?
[01:08] <phatmonkey> hey Laurenceb_
[01:08] <phatmonkey> jsut about to go to sleep!
[01:08] <edmoore> little
[01:08] <Laurenceb_> good plan
[01:08] <Laurenceb_> ah ok
[01:08] <Laurenceb_> just trying to understant fnobels lassen iq code
[01:09] <Laurenceb_> that would make the lassen iq big endian
[01:09] <Laurenceb_> thanks for the info
[01:10] <Laurenceb_> edmoore: have you got any IMU code running yet?
[01:11] <edmoore> no, not looked at it for months
[01:11] <edmoore> other stuff on the plate
[01:11] <Laurenceb_> I was reading up on unscented filters thats all
[01:11] <edmoore> odourless
[01:11] <Laurenceb_> might be worth a look... I dont know
[01:12] <Laurenceb_> but the "standard" extended kalman filter approach doesnt look too hard
[01:13] <Laurenceb_> just very clock cycle hugry with all the trig in the jacobians ect
[01:14] <Laurenceb_> is the B&Q dust sheet 9um ?
[01:15] <Laurenceb_> I'm thinking of using it for the mini rogallo wings, just wondering if it'll tear too easily
[01:18] <edmoore> probably
[01:18] <edmoore> it's not very strong
[01:18] <edmoore> don't rememeber the exact thickness though
[01:18] <edmoore> but picks up holes easily
[01:19] <edmoore> some ripstip nylon off ebay is the shizzle
[01:19] <edmoore> or tin foil :)
[01:19] <Laurenceb_> I'll see, the local hardware shop sells 15um which is pretty good
[01:19] <Laurenceb_> lol
[01:19] <Laurenceb_> I used ripstop before
[01:19] <Laurenceb_> but my prototype with polythene had better glide ratio
[01:20] <Laurenceb_> I suspect the polythene helped to maintain laminar flow
[01:20] <Laurenceb_> IMO a tinfoil superpressure balloon is crackers
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[01:21] <Laurenceb_> oh well time to get some sleep, cya
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[02:11] <fuzzylugnuts> Night
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[03:18] <robert1971> Evening all. 03:15 here
[03:18] <robert1971> Technically morning :)
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[03:33] <soneil> morning robert1971 (not that I'll admit to being awake at 3.30)
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[11:10] <Laurenceb_> greets
[11:10] <ShellEvil> beets.
[11:11] <edmoore> morn
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[14:41] Nick change: rhaRRISON -> rharrison
[14:51] <rharrison> any one know of an efficient way to convert 9v to 3.3 or 5.5 v?
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[15:21] <rharrison> http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1470502
[15:21] <rharrison> Found them
[15:42] <rharrison> aftnoon ShellEvil: natrium42
[17:11] <rharrison> Quiet today guys
[17:11] <rharrison> Just found a 32mb SD card :)
[17:11] <rharrison> Opps 32GB SD card
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[17:57] <Hiena> Good evening!
[17:57] <icez> Good morning!
[17:59] <Hiena> Anybody from Reading area?
[17:59] <edmoore> i spent all summer about 30 mins from reading
[17:59] <edmoore> am now about 1.5hrs away
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[18:11] <jcoxon> evening all
[18:16] <Hiena> edmoore, nice. I have a friend in the UK around that area. She is a flying nuts too, so maybe she will be interested for a high altitude balloon launch.
[18:17] <edmoore> oh cool
[18:17] <edmoore> well tell her to come along
[18:17] <edmoore> we're building a payload in guildford this week
[18:17] <edmoore> that's pretty close to reading
[18:18] <jcoxon> edmoore, which payload is this?
[18:18] <edmoore> nova9
[18:19] <Hiena> I'll, but I guess, she is a really busy with a jobhunting now. If you know IT tech-support openings, feel free to tell me. ;)
[18:21] <jcoxon> coolio
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[19:10] <natrium42> why do those nice radios lack UHF and VHF?
[19:10] <natrium42> only have HF
[19:13] <gordonjcp> natrium42: which nice radios?
[19:13] <natrium42> ICOM IC-756 Pro III, Elecraft K3
[19:14] <natrium42> Flex-5000
[19:15] <natrium42> they don't do anything below 6 meters
[19:15] <gordonjcp> presumably because it's specifically an HF rig
[19:16] <natrium42> so i need a separate radio?
[19:16] <gordonjcp> for what?
[19:16] <natrium42> would have been nice to get it all at that price
[19:16] <gordonjcp> natrium42: What exactly are you trying to do?
[19:16] <natrium42> just need a general purpose radio
[19:17] <natrium42> for all amateur bands
[19:17] <gordonjcp> fat chance
[19:17] <gordonjcp> assuming you could get such a thing, you'd have a radio that sucked equally badly on all bands
[19:17] <natrium42> FT-817 can do UHF, VHF and HF
[19:18] <natrium42> but it's not computer controllable
[19:18] <gordonjcp> you know how scanners are pretty sucky receivers?
[19:18] <gordonjcp> you've got a pretty wide range, but it's fairly deaf on nearly all of them?
[19:18] <natrium42> so which parameter tells me that?
[19:19] <natrium42> selectivity?
[19:19] <gordonjcp> sensitivity
[19:20] <natrium42> i checked it
[19:20] <natrium42> they seem to be close between that scanner and a dedicated HF transceiver
[19:20] <natrium42> 0.25 uV vs. 0.2 uV
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[19:23] <natrium42> some have 0.16 uV, though
[19:23] <natrium42> but it doesn't seem to be a big difference
[19:27] Action: jcoxon has 2 optoisolators, a plug for his radio and a radio...
[19:28] <jcoxon> here comes computer controlled radio
[19:29] <natrium42> hehe
[19:29] <natrium42> are the dials simple potentiometers?
[19:29] <natrium42> then you could just use a DAC
[19:30] <jcoxon> nah the multi pin plug has a pins for steps up and down in freq
[19:31] <natrium42> oh, neat
[19:31] <natrium42> which radio is it?
[19:31] <jcoxon> ft-790r
[19:32] <natrium42> it does VHF and UHF?
[19:33] <jcoxon> UHF
[19:33] <jcoxon> 430-440
[19:33] <natrium42> ah
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[19:34] <robert1971> evening all
[19:34] <jcoxon> hey robert1971
[19:34] <robert1971> Not going to be arround much tonight
[19:35] <robert1971> jcoxon: Got your email. I'm thinking the 27/28
[19:35] <robert1971> Weather depending.
[19:36] <robert1971> edmoore: If your there I got one of those converters but it has weird pins which means it wont fit on the stripboard. Any ideas?
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[19:36] <robert1971> It's been a quiet day on here today
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[19:37] <robert1971> If anyone sees mc- on here tonight can you tell him that I have his bits from farnell
[19:37] <jcoxon> robert1971, i'm back to work
[19:37] <robert1971> 27/28?
[19:37] <robert1971> Does that leave the 20th then
[19:38] <jcoxon> oh no
[19:38] <jcoxon> today i mean
[19:38] <jcoxon> hence why i wasn't around :-p
[19:38] <jcoxon> 27/28 is good with me
[19:40] <robert1971> Cool I have the w/e booked but I'm thinking ballooning is more fun. Rather than camping with the kids
[19:40] <robert1971> The wife will probably agree
[19:40] <robert1971> Helen :)
[19:41] <robert1971> She has a name
[19:41] <robert1971> Just going to put the kids to bed
[19:41] <robert1971> 5 mainsd
[19:41] <robert1971> mins
[19:41] Nick change: Ei5GTB_ -> EI5GTB
[19:43] <edmoore> robert1971: hrm
[19:43] <edmoore> do you know what pitch it actually is?
[19:43] <edmoore> might have to just solder wires from the board to it - bodgy but what can you do?
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[19:50] <robert1971> edmoore: Cool it weird the bins are quite thisck. Thicker than the holes in the strip baord
[19:50] <robert1971> it's*
[19:50] <robert1971> pins :)
[19:50] <robert1971> Need to slow the typing down
[19:52] <robert1971> jcoxon: Lets go with the 27/28th and make a decision on the wednesday which looks the best day for a launch
[19:52] <jcoxon> yup
[19:52] <jcoxon> sounds good
[19:52] <jcoxon> i'll keep an eye on the weather if you wan
[19:52] <jcoxon> t
[19:52] <robert1971> Perfect
[19:53] <robert1971> All welcome. I'll bring the car to chase
[19:54] <jcoxon> robert1971, yeah i'll be car less as i'll come up on the train
[19:54] <robert1971> This is going to be a beacon test only. Will get the tracker in action for both.
[19:55] <robert1971> JC's super beacon mkI and Icarus mk1 + chase car
[19:55] <robert1971> or is it MKII JC?
[19:56] <jcoxon> nah this'll be MK I
[19:56] <jcoxon> right i'll bbl
[19:56] <robert1971> ttfn
[19:58] <SpikeUK> robert1971 - may I please ask where'ish you will be launching from? I'd like to try to rx your sigs
[20:33] <natrium42> robert1971, so you decided against tethered test?
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[23:22] <Laurenceb_> hi all
[23:23] <Laurenceb_> rocketboy: when you're sending rtty from the radiometrix, what do you center your analogue input around?
[23:24] <Laurenceb_> Vcc/2 ?
[23:28] <rocketboy> yep
[23:28] <Laurenceb_> so if I use 3.3v, 1.65v ?
[23:28] <rocketboy> well radiometrix Vcc/2
[23:28] <Laurenceb_> oh
[23:28] <rocketboy> it has an internal reguulator
[23:28] <Laurenceb_> so 1.1v ?
[23:29] <rocketboy> 1.5V comes to mind
[23:29] <Laurenceb_> hmm thats annoying, I've soldering in the resistors now
[23:29] <Laurenceb_> giving 1.65v
[23:29] <Laurenceb_> how nonlinear is it?
[23:29] <rocketboy> don't worry - as long as its in that ballpark
[23:29] <Laurenceb_> ok
[23:30] <Laurenceb_> I just wnet off my experience with the v1 radio board
[23:30] <Laurenceb_> thanks
[23:30] <rocketboy> its not bad linearity wize IIR
[23:30] <Laurenceb_> Iok
[23:30] <Laurenceb_> I've just been assembling the mini rogallo, just waiting on lipo cells now
[23:31] <Laurenceb_> the SMPS is working
[23:31] <ShellEvil> :)
[23:32] <Laurenceb_> if the new radio formware (still to be written) is easy to debug then I might be ready to launch in just a few weeks
[23:32] <Laurenceb_> but with no scope or scanner I'm a bit scuppered
[23:33] <Laurenceb_> need to invest in some decent kit
[23:33] <rocketboy> i need a spectrum analyser
[23:33] <Laurenceb_> hehe one step ahead of me :P
[23:34] Action: Laurenceb_ hasn't even got a decent multimeter
[23:34] <ShellEvil> IME a scope - even a 20MHz one is an _enormous_ step up from no scope.
[23:34] <Laurenceb_> yeah
[23:35] <Laurenceb_> I want a digital storage scope
[23:35] <Laurenceb_> its really nice being able to grab datapackets and things off serial lines
[23:35] <ShellEvil> yeah.
[23:35] <ShellEvil> to do that nicely requires deep sample buffers and pockets though.
[23:35] <Laurenceb_> brb time to cook some supper
[23:37] <gordonjcp> yeah
[23:37] <gordonjcp> actually a 20MHz scope is useful for all kinds of stuff
[23:37] <gordonjcp> it's just that beyond about 25-30MHz it becomes more qualititive than quantitative
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[23:49] <rocketboy> cu
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[00:00] --- Tue Sep 16 2008