[00:00] <SpeedEvil> pointed telescope
[00:00] <Laurenceb> accel vector DOT line of sight to ground station gives the doppler rate
[00:04] <Laurenceb> from that paper I linked it looks like 20G is perfectly sane for a FLL tracking loop... but if an off the shelf receiver would manage it is uncertain
[00:09] <SpeedEvil> hmm
[00:09] <SpeedEvil> 40m thin coax, a strong right arm, and the right hat.
[00:10] <Laurenceb> ?
[00:11] <SpeedEvil> Indiana Jones - connect GPS to antenna, and whip the end
[00:11] <Laurenceb> lol
[00:11] <Laurenceb> I have acess to a simulator
[00:12] <Laurenceb> going to try a sirf and a ublox5
[00:12] <SpeedEvil> Oh - that maeks it almost trivial
[00:16] <Laurenceb> bl
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[00:31] <Laurenceb> hi ed
[00:34] <Laurenceb> I'm in derbyshire all wekk in answer to your text
[00:34] <Laurenceb> sorry my phone was dead - battery
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[00:38] <Laurenceb> with <15 second burn time for the first stage a phenolic silica nozzle works best
[00:38] <Laurenceb> could be really thin - 2mm or so
[00:46] <Laurenceb> I was thinking a graphite throat with machinable ceramic insulator
[00:46] <Laurenceb> then a titanium alloy ball joint arrangemt that also doubles as a mount for the phenolic
[00:51] <DanielRichman> Whoa shit. My SD Card code works!
[00:52] <DanielRichman> Second time too
[00:53] <Laurenceb> http://www.spacex.com/updates.php
[00:53] <Laurenceb> nice work
[00:53] <DanielRichman> natrium42, progress!
[00:53] <Laurenceb> raw writing?
[00:53] <DanielRichman> aye
[00:54] <SpeedEvil> DanielRichman: Woo!
[00:55] <DanielRichman> Essentially it tells the SD card that we want 128 byte sectors (messages are roughly 70chars), treats the first sector as a superblock with a pointer to where it should start writing (ie. if it crashes, pick up later on). It treats the SD card as quater-of-a-megabyte chunks and only updates the superblock when it finishes a chunk to avoid wearing out those bytes of flash/whatever memory
[00:56] <SpeedEvil> SD cards can do 128 byte sectors?
[00:56] <SpeedEvil> cool
[00:56] <DanielRichman> they can do 1337 byte sectors if you want
[00:56] <DanielRichman> actually it's called a block (my mistake)
[00:56] <DanielRichman> in the spec, there's a command (CMD 16) that lets you set the size of the block you want to write or read at once
[00:57] <DanielRichman> could be anything - but the sd card controller bitches if your strange-sized block transgresses a physical boundary between two memory chips if there are two in there, forex
[00:57] <DanielRichman> so to play it safe we used 128
[00:57] <SpeedEvil> I diddn't know they could do tiny blocks
[00:57] <SpeedEvil> that's relly handy
[00:58] <SpeedEvil> especiallyon stuff without 512 of RAM
[01:00] <DanielRichman> ah fek. I broke it
[01:00] <DanielRichman> but in general it works ;)
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[10:52] <Laurenceb> hi
[10:54] <Laurenceb> http://www.nsl.eu.com/primo.html
[10:54] <Laurenceb> another option for the gps
[10:54] <Laurenceb> stick it on the usb on the vortex86 board
[10:56] <russss> nifty
[10:56] <Laurenceb> I have a sige sampler
[10:56] <Laurenceb> but its bigger
[10:59] <Laurenceb> this is for a rocket
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[17:37] <natrium42> haha, nice
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[19:22] <jcoxon> evening all
[19:24] <SpikeUK> jcoxon Evening!
[19:25] <SpikeUK> Just reading interesting page GPS modules http://wiki.ukhas.org.uk/guides:gps_modules - your work?
[19:28] <jcoxon> SpikeUK, some of it - yes
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[19:29] <jcoxon> the wiki has some good info on it
[19:29] <SpikeUK> Would you update it? Tricky to get a date of last edit in the wiki - have you any later experience?
[19:30] <jcoxon> SpikeUK, sure
[19:31] <jcoxon> will do that later this evening - have a look tomorrow - should some more info/better organised
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[19:34] <RocketBoy> hey jcoxon: hows glasgi
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[19:34] <SpikeUK> Many thanks! I'm about to start playing with a Adafruit GPS data logger (http://bit.ly/32Utm) with a EM-406A GPS Module
[19:34] <RocketBoy> did yoy get ballasthalo2 back?
[19:35] <jcoxon> RocketBoy, hey, glasgow is good - no ballasthalo is still up the tree
[19:35] <jcoxon> didn't have time on my way up
[19:36] <RocketBoy> :-) & :-(
[19:37] <jcoxon> rjharrison had some plans to rescue it
[19:37] <jcoxon> if not i'll get it in the future
[19:39] <SpikeUK> jcoxon - is there a local agricultural coll? I'm sure they'd like the single rope technique practice ;-)
[19:39] <jcoxon> hehe
[19:40] <RocketBoy> In have been playing with a small liquid pump - 25g - pumps about a liter in about 4 mins
[19:41] <RocketBoy> its made of nylon
[19:41] <RocketBoy> (seems to be anyawy)
[19:41] <SpikeUK> RocketBoy impressive! Link?
[19:42] <RocketBoy> I just ordeded some Propyene Glycol
[19:42] <jcoxon> ooooo so you are doing my ballasthalo 3 for me :-D
[19:43] <jcoxon> excellent
[19:43] <RocketBoy> there itsn't a link i'm afraid - its a pump from an indoor water feature
[19:44] <SpikeUK> OK
[19:45] <SpeedEvil> DC I assume?
[19:45] <SpikeUK> Excuse ignorance but what's Propyene Glycol good for?
[19:45] <RocketBoy> yeah - it runs from on anything betetween 3 and 5V volts
[19:45] <jcoxon> SpikeUK, ballast :-)
[19:45] <jcoxon> it doesn't freeze
[19:46] <RocketBoy> and its nostly non toxic
[19:46] <RocketBoy> mostly
[19:46] <jcoxon> RocketBoy, are PM working for you?
[19:46] <RocketBoy> oh yeah
[19:46] <Daviey> Did the last launch get found, out of interest?
[19:46] <SpikeUK> OK - akin to Ethylene Glycol then?
[19:47] <SpikeUK> Less the toxicity
[19:47] <RocketBoy> yeah - but a lower freeze point and less toxic
[19:47] <SpikeUK> Thanks!
[19:47] <SpeedEvil> Vodka!
[19:47] <RocketBoy> I found PG is used in some foodstuffs
[19:48] <RocketBoy> could be - whats the freeze point?
[19:48] <RocketBoy> -27C
[19:48] <RocketBoy> not bad
[19:49] <SpeedEvil> 100 proof vodka is -40C I think
[19:51] <SpikeUK> Daivey - found but not yet recovered AFAIK
[19:54] <RocketBoy> suggestions for cheap, low freeze non toxic liquids welcome
[19:55] <SpikeUK> Austrian wine ;-) I'll get my coat
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[19:57] <SpikeUK> edmoore - hi!
[19:58] <edmoore> hi SpikeUK
[19:58] <edmoore> how're things?
[19:59] <SpikeUK> Fine thanks! I may be able to join your monitoring network in a few weeks. Got a 70cm rig on the way from eBay
[19:59] <edmoore> oh brill :)
[20:00] <edmoore> the bug has bitten then?
[20:01] <SpikeUK> Erm. Possibly ;-) Radio is an ollldddd hobby of mine. I've even asked for my old callsign back
[20:02] <edmoore> ah ok :) What was your old call, out of interest?
[20:03] <SpikeUK> G8IPN. Issued in 1975
[20:04] <edmoore> Ah neat
[20:05] <edmoore> auto-respect
[20:06] <edmoore> at the amsat conference, I think Fergus and I were pretty much the only M0s
[20:07] <SpikeUK> Really? All old g8ts like me ;-)
[20:07] <edmoore> more or less :p
[20:08] <SpikeUK> Is the AMSAT conf still held at Sandown?
[20:08] <SpeedEvil> It'll be interesting to see where it is in 2029
[20:08] <edmoore> Guildford this year
[20:08] <SpeedEvil> when - presumably - the internet will be much more pervasive.
[20:08] <edmoore> It was fascinating. The germans are going for a mars orbiter
[20:08] <SpeedEvil> Or we'll all be living in caves.
[20:09] <SpikeUK> There's all sorts of stuff going one about mars rovers ATM
[20:10] <SpikeUK> One of my colleagues has been involved in proposals
[20:10] <edmoore> The ExoMars thing has just gone a bit mad
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[20:11] Action: SpeedEvil wishes someone'd fix the price of space launch.
[20:11] <SpikeUK> Task 1 was to place a constellation of sats to provide mars version of GPS
[20:12] <edmoore> that would be cool!
[20:12] <edmoore> The thing I found out at the weekend, which I think is cool, is the GPS sats also have transmitters on the back pointing out to space
[20:13] <edmoore> just for various more secret projects in higher orbits
[20:13] <SpeedEvil> I was quite surprised when I ran the numbers was that GPS on hte moon actually works just fine with a conventional reciever and a 1.2m antenna
[20:13] <SpikeUK> Really? I must find out more
[20:14] <SpeedEvil> (I was assuming direct radiation from just coming over the earths horizon GPS sats - not back facing antennas)
[20:14] <SpeedEvil> though not one with default software of course
[20:14] <SpeedEvil> but the doppler environment and everything is pretty much the same as commercial GPS recievers normally face.
[20:15] <SpeedEvil> You'd only get (IIRC) 100m or so precision - but...
[20:15] <SpikeUK> Something to think about for lunar nav
[20:15] <edmoore> plenty in GEO
[20:16] <edmoore> jcoxon: which bit of the world are you in?
[20:16] <jcoxon> edmoore, glasgow
[20:16] <edmoore> with radio?
[20:17] <jcoxon> unfortunately not
[20:17] <jcoxon> pourquoi?
[20:17] <edmoore> just wondering
[20:17] <jcoxon> oh right
[20:17] <jcoxon> no radio
[20:17] <jcoxon> just laptop
[20:18] <edmoore> oh well
[20:21] <jcoxon> any launches coming up?
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[20:22] <edmoore> Just Rob, I think
[20:26] <jcoxon> okay cool
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[20:37] <edmoore> jcoxon: you know what we'll be talking about pretty soon
[20:38] <natrium42> me?
[20:39] <edmoore> you wish
[20:39] <natrium42> :(
[20:39] <natrium42> edmoore broke my heart
[20:39] <jcoxon> edmoore, ummm?
[20:39] <jcoxon> really?
[20:39] <edmoore> ...4...0...
[20:40] <jcoxon> haha
[20:40] <jcoxon> i assume you mean 4 more
[20:40] <natrium42> 4 more years?
[20:42] <edmoore> 4 more people
[20:42] <jcoxon> uhuh
[20:42] <edmoore> just a couple of months ago we were talking about the heady days when there may be 30 people in here
[20:42] <natrium42> ah :)
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[20:43] <DanielRichman> Done.
[20:43] <natrium42> \o/
[20:43] <edmoore> someone kick him
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[20:44] <DanielRichman> ah crap
[20:44] <jcoxon> mwhahahaha
[20:44] <SpeedEvil> I wonder if the five new users will talk amongst themselves
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[20:44] <jcoxon> hehe
[20:45] <natrium42> jcoxon, any news regarding payload retrieval?
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[20:53] <jcoxon> natrium42, its still there
[20:53] <natrium42> d'oh
[20:53] <jcoxon> we'll get it down at some point
[20:53] <jcoxon> i'm just a bit stuck
[20:54] <edmoore> glaaaascooooow is a bit far north to do anything useful
[20:54] <jcoxon> well :-)
[20:54] <natrium42> jcoxon, how about submitting the location to one of those geocaching sites?
[20:54] <jcoxon> thats a good idea
[20:54] <natrium42> and make sombeody else get it? :P
[20:55] <RocketBoy> bbl
[20:55] <SpikeUK> Could write a story with clues to location and hype it up?
[20:56] <SpikeUK> bbml
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[20:58] <natrium42> be back markup language?
[20:58] <edmoore> maybe later I think
[21:05] Action: jcoxon has started upgrading dl-fldigi to the latest version of fldigi
[21:07] <jcoxon> going to take a while
[21:16] <jcoxon> bbl
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[00:00] --- Tue Jul 28 2009