highaltitude.log.20090802

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[09:15] <jcoxon> ping natrium42 if you are awake
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[09:18] <jcoxon> morning edmoore
[09:18] <jcoxon> watched your amsat vid - really good
[09:18] <jcoxon> they all looked v. impressed
[09:19] <edmoore> watch doug's
[09:19] <edmoore> now that was a good talk
[09:19] <jcoxon> ooo i will
[09:19] <jcoxon> saw an image of me at the end - made me smile
[09:19] <edmoore> back in about 10 mins - just grabbing college breakfast before it goes
[09:20] <jcoxon> np
[09:20] <edmoore> :)
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[09:48] <edmoore> bk jcoxon
[09:51] <jcoxon> just watching dougs presentation
[09:51] <edmoore> me too
[09:51] <edmoore> I really enjoyed it
[09:52] <edmoore> the videos are very well put together too
[09:53] <jcoxon> yes
[09:55] <jcoxon> got a nice email from one of your local hams about tracking ballasthalo2
[09:55] <jcoxon> said he really enjoyed it
[09:56] <edmoore> what was his name may I ak - andrew something?
[09:56] <edmoore> ask*
[09:57] <jcoxon> steve platt
[09:57] <edmoore> doesn't ring a bell - probably a good thing - we're reaching out to all sorts of people :)
[09:58] <edmoore> i got a very grumpy email from some ham up in dervyshire with about 17 enumerated questions about terminal velocities and askign me to estimate the damage if it were to hit a plane or livestock or a car or whatever
[09:58] <jcoxon> oh dear
[09:58] <edmoore> I answered a few of his less stupid questions and then politely told him to f-off.
[09:58] <jcoxon> unfortunately we are going to face more and more
[09:59] <edmoore> (google revelaed him to be one of those wallies who spends their evenings in epic political battles in the comments section of political blogs)
[09:59] <jcoxon> but for every problem i reckon we'll get 2 happy people
[09:59] <edmoore> I was thinking we should be super open and honest about our risk assessments, and maybe make a safety FAQ
[09:59] <jcoxon> G4WSZ
[09:59] <jcoxon> yes
[09:59] <jcoxon> i think thats agood idea
[10:00] <jcoxon> in theory we've got a week before the flood gates might open
[10:00] <edmoore> wyzat?
[10:01] <jcoxon> steve's bbc shows a week tomorrow
[10:01] <edmoore> oh yes
[10:01] <edmoore> I might hurry up and prep that document
[10:01] <jcoxon> might be worth all of us putting our heads together and fixing up the wiki
[10:02] <edmoore> i need someone to reset my wiki account]
[10:02] <edmoore> can't remember my password
[10:03] <jcoxon> hehe, one sec
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[10:17] <jcoxon> wow the new horizon images are incredible
[10:23] <edmoore> agreed
[10:24] <edmoore> i had no idea about that
[10:26] <jcoxon> excellent talk
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[10:26] <jcoxon> we need to get the UMSF on board more
[10:26] <jcoxon> hehe
[10:26] <edmoore> he really nailed it
[10:27] <jcoxon> he really did
[10:27] <edmoore> yes - I wanted to try and do a more spage agency sytle mission for a storm hab
[10:27] <edmoore> i.e. ask for suggestions of instruments
[10:27] <jcoxon> storm hab - i love that idea
[10:27] <edmoore> and do a build log and science exchange and so on on UMSF
[10:27] <edmoore> ask them what data they want, what cameras and at what angles etc
[10:27] <jcoxon> i'd love to contribute sstv (i know others could provide it as well :-) )
[10:27] <edmoore> i just want to see cumulo nimbus from above
[10:28] <jcoxon> edmoore, did the login work?
[10:29] <edmoore> yes thank you
[10:29] <jcoxon> just delete the 50 spam accounts that have registered
[10:29] <jcoxon> i deleted your other account
[10:31] <edmoore> so you're in glascow currntly?
[10:31] <jcoxon> yup
[10:32] <jcoxon> here for another week and a half
[10:32] <edmoore> then how long in ghana?
[10:33] <jcoxon> 6 weeks
[10:33] <jcoxon> back on 3rd Oct
[10:33] <edmoore> jcoxon: http://wiki.ukhas.org.uk/projects:stratogulp_return_to_launch_system_for_high_altitude_balloon_payloads
[10:33] <jcoxon> yup
[10:33] <edmoore> looks interesting
[10:33] <jcoxon> he comes on the channel at about 3am BST
[10:33] <jcoxon> as is based in canada
[10:34] <jcoxon> edmoore, how about a Beginners FAQ at the top of hte page?
[10:34] <edmoore> so not much overlap then
[10:34] <jcoxon> in bold text
[10:34] <jcoxon> (a link that is)
[10:34] <edmoore> yeah
[10:35] <edmoore> with an emphasis on the safety question I guess
[10:35] <jcoxon> yes
[10:38] <jcoxon> i also think we should take down www.ukhas.org.uk and perhaps have it direct straight to the wiki
[10:38] <jcoxon> as no one updates it yet it provides a lot of the traffic
[10:39] <edmoore> i don't disagree
[10:39] <edmoore> the wiki is what the site is about really
[10:39] <jcoxon> i'll run it by the list
[10:41] <jcoxon> hehe, i've got a hysplit model that launches from the falklands and in 120hrs pretty much makes it back
[10:41] <edmoore> wow :D
[10:41] <edmoore> back in 1 min
[10:44] <edmoore> bk
[10:45] <jcoxon> okay page setup - time to get writing
[10:45] <jcoxon> first i'm going to update the GPS page as i promised spikeuk about 5 days ago i would
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[11:18] <jcoxon> edmoore, any idea who is taking over from W0RPK?
[11:18] <edmoore> nope
[11:20] <edmoore> i don't think the thread of [GPSL] ever really reached a conclusion
[11:24] <edmoore> going to go to the fitz museum - it's been about 3 years :)
[11:24] <edmoore> could do with a couple of hours of something non-ballooney too
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[11:25] <jcoxon> edmoore, sounds sensible
[11:25] <jcoxon> :-D
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[12:55] Nick change: kingj -> KingJ
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[13:08] <Xenion> Hello everyone ! :-)
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[13:46] <Laurenceb> hello
[13:51] <SpeedEvil> o
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[15:20] Action: Laurenceb has been putting together a two stage design
[15:20] <Laurenceb> works out at 8cm diameter, 90cm lenght
[15:20] <Laurenceb> staying with 5Kg GLOW
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[15:39] <Laurenceb> however it looks like it burns in the first 6 seconds then the remaining 8 seconds is gas escaping from the chamber through the small nozzle
[15:39] <Laurenceb> not good
[15:41] <Laurenceb> but... burn time roughtly scales with 1/pressure, so lowering the pressure to around 500psi instead of 1500 should extend the burn time to ~15 seconds
[15:42] <Laurenceb> http://pro38.com/products/pro98/motor/MotorData.php?prodid=7441M1060-P
[15:44] <SpeedEvil> If it'ss table
[15:44] <SpeedEvil> stable
[15:44] <SpeedEvil> I suspect only doubling shouldn';t be that bad though
[15:46] <Laurenceb> well more large srbs operate around 500psi
[15:47] <Laurenceb> but they do use catalyst addatives and things...
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[16:04] <Laurenceb> http://pro38.com/products/pro98/motor/MotorData.php?prodid=7441M1060-P might just work
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[18:30] <chembrow> evening. has anyone tried using a radiometrix nrx2 as a receiver, paired to an ntx2.
[18:30] <chembrow> I can't find an SSB receiver in my price range, so wondered about this as a low-cost alternative
[18:34] <edmoore> chembrow: i think you will find the sensitivity very dissapointing
[18:34] <edmoore> you would need a huge amount of gain on your antenna to make up for its comparative deafness
[18:35] <chembrow> edmore, thx.
[18:35] <chembrow> I'm a complete novice to radio.
[18:35] <chembrow> back to ebay then, I guess
[18:36] <edmoore> so was I a bit back (I still am really, especially compered to people on here like rocketboy and gordonjcp) . you'll pick it up pretty quickly
[18:36] <edmoore> where are you based chembrow?
[18:36] <chembrow> stoke
[18:36] <edmoore> ok. I think actually we're lending our yaesu ft-790 to someone already
[18:37] <edmoore> but that's a very good, sensitive 70cm radio. Old, but still more than stands up to modern stuff
[18:37] <chembrow> thanks. I think that was one of the ones I was looking on ebay for.
[18:38] <chembrow> I reckon I could sneak a purchase of around £100 under the missus' radar, but everything I've seen has been £150+ :(
[18:38] <edmoore> it was a soul radio for about 2 years - a great performer
[18:38] <edmoore> well, try private adds and boards perhaps
[18:38] <Hiena> Hmmm...Anybody knows a good MOSFET based antenna amplifier for the UHF band?
[18:38] <edmoore> you certainly can get them for nearer £100 than £150
[18:39] <chembrow> thanks again
[18:39] <edmoore> but yes, the basic going rate for them seems to be of the order of 150
[18:39] <edmoore> Hiena: dxzone.com is good for links to designs
[18:39] <edmoore> right, off to grab some food and drink
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[18:40] <Hiena> Uhum. Well, first hafta build a LPDA
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[19:09] <SpikeUK> jcoxon - ping
[19:13] <SpikeUK> Rats - just missed him ;-(
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[19:41] <sbasuita> SpikeUK, ^^^^ !msg
[19:43] <SpikeUK> sbasuita - ta!
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[19:45] <SpikeUK> sbasuita - I didn't know we could do that! Clever!
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[20:22] <edmoore> pissbum
[20:25] <rjharrison> edmoore typical hey
[20:25] <rjharrison> How's it going
[20:25] <edmoore> :)
[20:25] <edmoore> not bad thanks
[20:25] <rjharrison> I thought you guys would have had a few balloons up by now
[20:25] <edmoore> had a good afternoon doing something that isn't work
[20:25] <rjharrison> hehe coo
[20:25] <rjharrison> l
[20:25] <rjharrison> what was it
[20:25] <edmoore> went to a museum and then had a picnic by the river
[20:26] <rjharrison> Nice wx too
[20:26] <edmoore> yeah
[20:26] <edmoore> but good to do something not ballooney, I think. That's not to say I wasn't having a think about it :)
[20:26] <rjharrison> lol
[20:27] <rjharrison> I'm sending in AVcc from a divider from the psensor board
[20:28] <edmoore> come again?
[20:28] <edmoore> Oh I see
[20:28] <rjharrison> However the AVcc is a bit low as I'm getting 255 from the adc conversion
[20:28] <rjharrison> So I plan to lower the divider to give a higher max V
[20:29] <rjharrison> Thus preventing the psensor reaching 255 on the adc
[20:29] <rjharrison> Is that good practive not to hit the range limits on the adc?
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[20:30] <akawaka> http://spacefellowship.com/2009/08/01/interorbital-syatems-tubesat-personal-satellite-kit/
[20:31] <edmoore> well, depends on whether or not you want that information and whether or not the adc is rated to have inputs about AVcc
[20:31] <rjharrison> above?
[20:31] <edmoore> sorry yes
[20:32] <rjharrison> Humm good point
[20:32] <rjharrison> I'm going to fix the AVcc to be more than the max output from the sensor
[20:32] <rjharrison> Then calibrate
[20:33] <rjharrison> AVcc is comming from the same regulator to take into acounts any temp variation during ascent
[20:33] <rjharrison> reg = 5V
[20:35] <edmoore> sure yep
[20:35] <edmoore> it's probably not so crucial for this sensor, but you can find lots of ref designs (I think also in the avr app notes) on how to smooth the input into the AVcc
[20:50] <SpeedEvil> Generally - IIRC the range can exceed the ADC range without issue as long as it remains within VCC+0.3V or GND-0.3V
[20:50] <edmoore> 0.3V sounds about right iirc - I'm pretty sure that's what the avr datasheet says
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[21:04] <SpeedEvil> la: http://science.slashdot.org/story/09/08/02/1653256/Orbit-Your-Own-Satellite-For-8000
[21:04] <edmoore> akawaka linked o that about 35 mins ago :p
[21:06] <SpeedEvil> ah
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[22:23] <jcoxon> evening all
[22:23] Action: jcoxon likes it when zeusbot delivers messages
[22:38] <edmoore> :)
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[00:00] --- Mon Aug 3 2009