highaltitude.log.20090221

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[01:33] <natrium42> yo lb
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[08:57] <jcoxon> morning all
[08:57] <jcoxon> http://spacenear.us/gfs/2009-02-21-4.png
[08:57] <jcoxon> :-D
[09:00] <gordonjcp> what's that?
[09:00] <jcoxon> forecast for teh 25th of feb
[09:02] <jcoxon> gordonjcp, i'm running them everyday in preparation for a trans-atlantic flight
[09:05] <gordonjcp> nice
[09:05] <gordonjcp> are you launching on the 25?
[09:05] <gordonjcp> 25th even
[09:07] <jcoxon> no
[09:07] <jcoxon> the payload isn't ready
[09:07] <jcoxon> but i'm keeping an eye in an attempt to get good at forecasting
[09:07] <jcoxon> would like to attempt it in about a months time
[09:08] <jcoxon> it'll be broadcasting on HF so will need to rope you in to listen for it
[09:23] <gordonjcp> okay
[09:24] <gordonjcp> what frequency were you planning on using?
[09:24] <jcoxon> not sure yet
[09:24] <jcoxon> we've thrown a few ideas
[09:24] <jcoxon> any suggestions?
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[09:59] <jcoxon> morning edmoore
[09:59] <edmoore> mornign jcoxon
[09:59] <edmoore> all wel?
[09:59] <jcoxon> yeah, good thanks, you?
[09:59] <edmoore> v good
[09:59] <edmoore> churchill brunch soon
[09:59] <jcoxon> excellent
[09:59] <edmoore> so all is well
[09:59] <jcoxon> :-)
[10:00] <jcoxon> going to build my HF antenna today
[10:00] <edmoore> cool
[10:00] <jcoxon> well stick it over my roof
[10:00] <edmoore> what size?
[10:00] <jcoxon> its just a long wire
[10:00] <jcoxon> as long as my roof is :-p
[10:01] <jcoxon> need to get myself an ATU as well
[10:01] <edmoore> aaargh
[10:01] <edmoore> expensive
[10:01] <edmoore> I was put off getting one of them
[10:02] <jcoxon> steve is going to make one
[10:02] <edmoore> but I can see the attraction
[10:02] <edmoore> oh cool
[10:02] <jcoxon> if it works out well i might copy him
[10:02] <edmoore> servo and variable cap?
[10:02] <jcoxon> let me find the link
[10:03] <jcoxon> http://www.qsl.net/vk3jeg/atu.html
[10:03] <jcoxon> the 2nd diagram from the bottom
[10:04] <edmoore> cool
[10:04] <edmoore> nice
[10:04] <jcoxon> but thats a job for another day
[10:04] <jcoxon> just get the antenna up today
[10:05] <edmoore> I can see london from my room
[10:05] <edmoore> that's about it
[10:05] <edmoore> so maybe I should get something up and say hello
[10:05] <jcoxon> you can see london?!?
[10:05] <edmoore> as in, LOS
[10:06] <jcoxon> oh
[10:06] <jcoxon> yeah do
[10:06] <edmoore> cos I'm in the corner of the building
[10:06] <jcoxon> i was playing with 10m of wire and could hear USA stations on psk31
[10:06] <edmoore> :)
[10:06] <edmoore> i quite want to go mobile
[10:07] <edmoore> the eeepc and the ic7000 is a nice mobile combo
[10:07] <jcoxon> so yeah stick some wire somewhere and have a go :-p
[10:07] <jcoxon> rob, steve and i tried to chat but couldn't get it to work, guess it was propegation issues
[10:08] <edmoore> yeah
[10:08] <edmoore> what power?
[10:08] <jcoxon> well i could only do 5W
[10:08] <jcoxon> but my setup wasn't efficient at all
[10:09] <edmoore> i can't fm with fergus directly with about 25W
[10:09] <edmoore> from churchill to queens
[10:09] <edmoore> just because I can't see him
[10:09] <edmoore> through the repeater, which I can see, we can talk crystal clear
[10:09] <jcoxon> maybe something like 10m would be optimal
[10:10] <edmoore> this was on uhf, sorry
[10:10] <edmoore> 10m sounds good
[10:10] <jcoxon> well grab some wire and we can have a go sometime when you get time
[10:10] <edmoore> tess is up atm, but next week I will
[10:11] <edmoore> going to EADS Astrium on monday
[10:11] <edmoore> to give a wee talk and to get a tour of the satt building facilities!
[10:11] <jcoxon> fair enough :-p
[10:11] <jcoxon> oh cool
[10:11] <edmoore> a HAB social network, in the style of diydrones.com, might be cool
[10:12] <edmoore> i guess we've got t'wiki
[10:12] <jcoxon> yeah
[10:12] <jcoxon> ran the latest hysplit forecast
[10:12] <edmoore> yeah?
[10:13] <jcoxon> http://spacenear.us/gfs/2009-02-21-4.png
[10:13] <jcoxon> :-p
[10:13] <jcoxon> i reckon thats going to Cambridge hehe
[10:13] <edmoore> ooooh!
[10:13] <edmoore> natrium is ideally places isn't he
[10:14] <edmoore> placed*
[10:14] <jcoxon> the only issue is that its going to cross teh US
[10:14] <jcoxon> i'm not sure how happy they'll be
[10:15] <edmoore> yeah
[10:15] <edmoore> almost not worth asking
[10:15] <jcoxon> there were suggestions we could just pop south of the border and launch there
[10:16] <jcoxon> thus avoiding the issue
[10:17] <edmoore> praps sensible
[10:21] <jcoxon> hmmm i'm looking at miniture solenoid valves
[10:22] <edmoore> why?
[10:22] <edmoore> for valves?
[10:23] <jcoxon> for the ballast system
[10:23] <edmoore> uhuh
[10:23] <edmoore> what's the ballast medium?
[10:23] <jcoxon> denatured ethanol
[10:23] <jcoxon> i'm thinking pinch valves are useless
[10:24] <jcoxon> and really need direct-acting valves
[10:24] <edmoore> can you nick anything from work?
[10:25] <jcoxon> hehe not without the risk of someone dying :-p
[10:26] <edmoore> right, time to have some brunch
[10:26] <jcoxon> cya
[10:26] <edmoore> bbl
[10:27] Nick change: edmoore -> edmoore|away
[10:35] <jcoxon> hmm perhaps pinch valves are okay
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[12:42] <rjharrison_> windy day today
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[18:07] <jcoxon> evening all
[18:09] <SpeedEvil> Evening.
[18:12] Action: jcoxon has a nice new 20m long wire over his roof
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[20:00] <rjharrison_> Evening all
[20:01] <rjharrison_> just been looking at buying an antenna analyser
[20:07] <edmoore> so loyd grossman is currently in the college bar doing a punk set with a band
[20:07] <edmoore> surreal
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[20:24] <jcoxon> oops
[20:25] <jcoxon> kept pressing apple-Q
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[20:37] <jcoxon> hey G8KHW
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[23:04] <jcoxon> hey all
[23:04] <jcoxon> hey sYx66, welcome to #highaltitude
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[23:12] <natrium42> omg, it's sYx66
[23:12] <jcoxon> hey natrium42
[23:12] <natrium42> hi jcoxon
[23:12] <natrium42> any launches this weekend?
[23:13] <jcoxon> no while the weather was nice on the ground the JS is vicious
[23:13] <natrium42> http://spacenear.us/gfs/2009-02-21-4.png
[23:13] <natrium42> :)
[23:13] <jcoxon> i know
[23:13] <natrium42> too bad we aren't ready
[23:13] <jcoxon> oh well
[23:13] <jcoxon> we'll get there
[23:13] <jcoxon> soon...
[23:15] <jcoxon> got my antenna on my roof
[23:16] <natrium42> long wire?
[23:16] <jcoxon> yeah
[23:16] <jcoxon> 20m
[23:17] <natrium42> coolz
[23:17] <jcoxon> good reception on 40m
[23:17] <jcoxon> not so sure about how good it is at transmitting
[23:17] <jcoxon> really need to make an ATU
[23:17] <natrium42> i wonder if i should try to put mine higher too
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[23:18] <Laurenceb> hello
[23:19] <jcoxon> hey Laurenceb
[23:19] <Laurenceb> any trans developments?
[23:19] <jcoxon> ummm got my antenna sorted
[23:20] <sYx66> i told you to string it to your neighbour
[23:20] <Laurenceb> ok?
[23:20] <jcoxon> yeah its good
[23:20] <Laurenceb> sYx66: ?!
[23:20] <sYx66> talking to natrium
[23:20] <Laurenceb> k :P
[23:20] <natrium42> it's 30 meters but only about 5ft above ground
[23:21] <natrium42> sYx66, i don't know if my neighbour is cool enough
[23:21] <Laurenceb> jcoxon: whats the ant plan?
[23:21] <jcoxon> natrium42, mine lines across the roof - i doubt its perfectly efficient
[23:21] <Laurenceb> trailing dipole?
[23:21] <jcoxon> Laurenceb, oh i'm not sure about that
[23:21] <Laurenceb> oh your antenna :P
[23:21] <jcoxon> i mean my base station antenna
[23:21] Action: Laurenceb misunderstood
[23:22] <Laurenceb> yeah... I think we need some sort of balloon sim code
[23:22] <natrium42> jcoxon, any news about the valves?
[23:22] <Laurenceb> so it actually simulates a balloon flying using a weather model
[23:22] <jcoxon> no nothing - i sent some more emails to otehr companies that make miniture valves
[23:22] <Laurenceb> and the actual flight code
[23:23] <Laurenceb> along with simulating things like solar heating and envelope icong
[23:23] <Laurenceb> theres a few papers I've found on envelope heating
[23:23] <Laurenceb> icing would be a bit harder, and dependent on envelope properties
[23:24] <jcoxon> well we can easily get the flight path off hysplit
[23:24] <Laurenceb> but you could just try and avoid conditions where condensation would form on the envelope
[23:24] <Laurenceb> yeah, but the altitude is that of an air parcel
[23:24] <jcoxon> yes but we can re run it according to teh altitude we were at according to our ascent/descent sim
[23:25] <Laurenceb> ok, but theres position as well
[23:25] <Laurenceb> and atmospheric humidity ect
[23:25] <jcoxon> we do need some data
[23:25] <Laurenceb> IMO best to write from scratch
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[23:25] <jcoxon> perhaps we can get old snox data
[23:25] <Laurenceb> yeah that would help as the envelope is similar
[23:26] <jcoxon> as they did transmit the temp and time
[23:26] <jcoxon> and we have very similar envelope
[23:26] <Laurenceb> but theres papers on similar envelope behaviour
[23:26] <Laurenceb> yeah
[23:26] <Laurenceb> - where they had sensors inside and on the surface of the envelope
[23:26] <jcoxon> natrium42, did you every keep the data you lifted from the snox flight onto your tracker map?
[23:27] <Laurenceb> basically we want to avoid falling through the dew point at sunset
[23:27] <natrium42> jcoxon, no
[23:27] <Laurenceb> at 11Km cruise thats harder
[23:27] <natrium42> it was only position data anyway
[23:27] <jcoxon> okay, no worries
[23:27] <jcoxon> wasn't there temp data?
[23:27] <Laurenceb> jcoxon: yes, but not inside the envelope
[23:27] <natrium42> i think so, but i didn't log it
[23:29] <Laurenceb> IMO a good enough sim would use some envelope heating data from papers (JAXA did some work on this) together with a basic/bouyancy drag based sim of altitude
[23:30] <Laurenceb> tricky thing would be to simulate the heat exchange between the envelope and surrounding air
[23:31] <Laurenceb> but published data should allow a rough estimate
[23:31] <jcoxon> oooo i got a cool map for my wall of the northern atlantic
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[23:32] <jcoxon> urgh my antenna has high SWR
[23:32] <jcoxon> need a tuner
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[23:32] <Laurence> damn irc
[23:32] Nick change: Laurence -> Laurenceb
[23:36] <natrium42> Laurenceb, you like mibbit, don't you :P
[23:36] <Laurenceb> I have to use it
[23:36] <Laurenceb> as IRC is bloack by the firewall here
[23:37] <natrium42> ah
[23:37] <Laurenceb> mibbit sucks
[23:37] <natrium42> setup a socks proxy at home
[23:37] <Laurenceb> one wrong mouse click and you lose the session
[23:37] <Laurenceb> yeah
[23:37] <natrium42> http://3proxy.ru/
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[23:49] <jcoxon> there seems to be a CW contest on 40m tonight
[00:00] --- Sun Feb 22 2009