highaltitude.log.20101027

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[02:42] <Darkside> juxta: whens the next horus launch?
[02:42] <juxta> not sure Darkside
[02:42] <juxta> have spent last couple of hours try to compile the predictor binary under win32
[02:43] <juxta> finally got the toolchain working, now it's falling over about 50% through compile because this doesnt seem to be supported in mingw32:
[02:43] <juxta> http://manpages.courier-mta.org/htmlman3/scandir.3.html
[02:43] <juxta> alphasort
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[02:46] <juxta> sorry, scandir itself isn't provided
[02:46] <juxta> hrrm, either rewrite the code not to use scandir, or go the cygwin route
[03:04] <Darkside> juxta: srsly, why not switch to nix?
[03:05] <Darkside> oh wait, oziexplorer
[03:05] <Darkside> bah
[03:05] <juxta> yeah
[03:05] <juxta> plus all the DF gear code
[03:05] <Darkside> :(
[03:05] <juxta> it's ok, it built easy in cygwin
[03:05] <juxta> wasted a bunch of time trying mingw though, haha
[03:05] <Darkside> im working on my exhibition poster atm
[03:06] <Darkside> about a third of it is horus 8 stuff :P
[03:09] <juxta> oh nice - when's your exhibition?
[03:09] <Darkside> friday
[03:09] <juxta> Darkside, the reason for the win32 build of the predictor by the way is to have the landing prediction run locally on the car pc's, should be ready for next flight :D
[03:10] <Darkside> juxta: your navigator on horus 8 was alan, right?
[03:10] <Darkside> i can't remember his name
[03:10] <juxta> yep
[03:10] <Darkside> ok
[03:11] <Darkside> whats his last name, grant wants to know
[03:13] <juxta> do you know of a better shell for win32 Darkside?
[03:13] <Darkside> no
[03:13] <Darkside> lol
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[06:50] <earthshine> morning
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[07:00] <Upu> morning
[07:00] <jcoxon> morning
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[07:12] <junderwood> So it is. :-)
[07:12] <m1x10> Hi bots
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[07:25] <juxta> hi all
[07:26] <m1x10> http://www.youtube.com/watch?v=je2lWjfpywQ
[07:26] <m1x10> Wi-Fi Direct"
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[07:48] <juxta> hey junderwood, have you played with the predictor binary before?
[07:48] <junderwood> The CUSF one? No. I have my own.
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[07:49] <juxta> oh right - I thought you were at CU!
[07:49] <juxta> (are you?)
[07:50] <junderwood> No, but I have been involved with some of their flights and they were kind enough to fly a school payload for me.
[07:50] <junderwood> (HelioSS 1)
[07:50] <juxta> ah, righto :)
[08:06] <m1x10> hey
[08:06] <m1x10> I got a question
[08:07] <m1x10> In what do we measure the battery capacity? Not the mAh. I mean in what form is energy inside and how I measure the amount of it?
[08:08] <m1x10> I know there are some chemicals that react and produce electrons flowing
[08:08] <m1x10> how much "electrons" am I going to have?
[08:08] <m1x10> dont know how else to put this question
[08:10] <jcoxon> you'd measure battery voltage
[08:10] <jcoxon> and that could then could work out how much capacity is left
[08:11] <m1x10> how many "electrons" am I going to have from the whole battery
[08:11] <jcoxon> nah thats not really how it works
[08:11] <m1x10> yes I understand
[08:11] <m1x10> im trying to express myself mostly :(
[08:11] <m1x10> let me put it another way
[08:12] <m1x10> for capacitors we count their capacity (how many electrons) with Farad.
[08:13] <m1x10> capacitors are tiny batteries that discharge very fast
[08:13] <m1x10> I have an 2000uF cap. How I compare it's capacity to a battery's?
[08:14] <jcoxon> m1x10, got to go unfortunately
[08:14] <jcoxon> bbl
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[08:14] <m1x10> oh ok
[08:14] <m1x10> any othe candidate here ?
[08:14] <m1x10> :p
[08:14] <jonsowman> juxta: ping
[08:14] <juxta> heya jonsowman
[08:15] <jonsowman> the GFS and GFS-HD models are released at the same time mostly
[08:16] <jonsowman> and don't seems to be any more unreliable than the other
[08:16] <jonsowman> *neither seems
[08:16] <juxta> alrighty, thanks :)
[08:16] <jonsowman> the non-HD ones are significantly less data though
[08:17] <juxta> hmm - data shouldnt be too big of a deal, we'll be downloading that just prior to heading out
[08:18] <jonsowman> use whichever suits then - you can see via running web based predictions that the HD data normally makes very little difference to the landing prediction
[08:18] <jonsowman> a few km at most
[08:18] <juxta> yeah
[08:18] <juxta> it's marginal
[08:19] <juxta> I guess more computation though, I compared them
[08:19] <juxta> I havent* compared
[08:19] <jonsowman> yes slightly
[08:19] <jonsowman> on any half decent machine though the actual prediction doesn't take long at all
[08:19] <jonsowman> most of the time is spent grabbing GFS data
[08:20] <jonsowman> out of interest, how difficult/otherwise was it to get it to compile on win32?
[08:20] <juxta> well I wated the morning trying to get it to compile under mingw
[08:20] <juxta> wasted* even
[08:21] <juxta> the predictor makes a call to scanfile() which isnt implemented in mingw
[08:21] <jonsowman> ah :\
[08:21] <juxta> very easy in cygwin though :)
[08:21] <jonsowman> ah excellent
[08:22] <jonsowman> might be worth putting the helper scripts somewhere so other people can do the same thing?
[08:22] <juxta> yup
[08:22] <juxta> will put up a guide
[08:22] <jonsowman> :)
[08:23] <jonsowman> is your source a direct clone of rjw's git repo?
[08:23] <juxta> yeah - I was about to ask if you'd made any mods to the pred binary
[08:24] <jonsowman> no I don't think so, not that I can remember
[08:24] <jonsowman> the python GFS grabber script is heavily modified in the V2 predictor though
[08:24] <jonsowman> I'm pretty sure the binary itself is original though
[08:25] <juxta> mm - the grabber I'm using is this one: http://github.com/rjw57/cusf-landing-prediction/blob/master/pydap/get_wind_data.py
[08:27] <juxta> is new grabber better?
[08:27] <jonsowman> I think rjw's grabber goes for the HD data and doesn't ask
[08:27] <juxta> yeah, it does
[08:28] <jonsowman> but mainly the V2 predictor one is modified for the purpose of making the webUI nicer
[08:28] <jonsowman> forex, it writes its progress to a JSON file so the client can read it and display a progress bar
[08:29] <jonsowman> also it checks for other instances of the process running for the same scenario, and just quits if it finds them, and also writes the dataset and runtime to file
[08:29] <jonsowman> most significant change is that ours caches data, rjw's doesn't
[08:29] <juxta> yeah, that sounds sensible
[08:29] <jonsowman> oh...
[08:29] <jonsowman> http://github.com/jonsowman/cusf-standalone-predictor/commits/master/predict.py
[08:29] <jonsowman> there you go :P
[08:30] <juxta> haha
[08:30] <juxta> well, we'll be just downloading the data for the next 24 hours and dumping it
[08:31] <jonsowman> yea
[08:31] <juxta> i've been up and down all over your repo today, hehe
[08:31] <jonsowman> haha
[08:32] <juxta> I was going to ask you if you knew how to tell the predictor it'd reached the end of the scenario when you pass it over stdin, but i eventually figured it was EOF :)
[08:32] <jonsowman> yup
[08:33] <jonsowman> the web predictor writes it to a .ini and passes that to the binary, mainly because we might need that data again later when someone views an old prediction, we want to populate the form with the original scenario
[08:35] <juxta> makes sense :)
[08:35] <juxta> it verks, woo!
[08:35] <juxta> prediction time is about 5ghz on this old 2ghz celeron
[08:35] <juxta> oh man, I'm too tired
[08:35] <juxta> 5 seconds, even
[08:40] <jonsowman> not bad :D
[08:40] <juxta> just going to test the mapping software now and see if it's API has a bit of a hissy fit when I inject 200 points at one go
[08:41] <jonsowman> haha
[08:41] <jonsowman> what software are you using?
[08:41] <juxta> in* one go
[08:41] <juxta> OziExplorer
[08:41] <jonsowman> ah right
[08:42] <juxta> there's a screenshot here: www.bogaurd.net/tracking.png
[08:42] <juxta> zoomed out quite a long way
[08:42] <juxta> but the maps are very good, they even cover roads on private land etc
[08:43] <jonsowman> wow yea that looks really good
[08:43] <jonsowman> we used Mappoint for offline maps
[08:44] <juxta> yeah, I thought that would be nifty, but it seems there are no Mappoint maps for Aus :(
[08:44] <jonsowman> D:
[08:47] <juxta> hey hey, OziExplorer doesn't even mind too much! success!
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[08:48] <jonsowman> :D
[08:49] <juxta> conveniently the pred binary puts only the output coords on stdout, the debug etc goes to stderr
[08:49] <juxta> makes parsing it a bit nicer
[08:49] <jonsowman> :)
[08:53] <juxta> I'm pretty happy about this, the biggest gripe we've had on the last few launches was getting up to date predictions when we lose net access
[08:53] <jonsowman> excellent, well this should help a lot
[08:56] <juxta> indeed
[08:57] <juxta> hmm, my plotting software does not like it when I accidentally tell it to load a binary rather than a text logfile of telemetry
[08:57] <jonsowman> understandable really :P
[08:57] <juxta> many beeps as it tries to print unprintable chars
[08:57] <jonsowman> haha
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[12:55] <Hibby> afternoon all
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[13:16] <Darkside> http://vimeo.com/16241165
[13:16] <Darkside> juxta: http://vimeo.com/16241165
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[13:38] <Laurenceb_> whats a good way to remove 0.1'' pin headers?
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[13:49] <jcoxon> afternoon all
[13:50] <eroomde> hi jcoxon
[13:52] <Darkside> http://vimeo.com/16241165
[13:52] <Darkside> check that ouy
[13:52] <jcoxon> eroomde, i'm sorry - i've had to come up to london to sort out my flat
[13:55] <griffonbot> @nearsys: Preparing for a Sunday launch from KU. #ARHAB [http://twitter.com/nearsys/status/28892008075]
[13:55] <eroomde> jcoxon: not to worry
[13:55] <eroomde> some other time
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[13:56] Action: jcoxon waits for the gas man...
[14:00] <jcoxon> eroomde, i'm around in worthing for the next 8 months or so...
[14:00] <jcoxon> i'm sure we'll find time
[14:03] <eroomde> Darkside: that's a lovely vid
[14:03] <eroomde> very well shot
[14:03] <Darkside> wasnt me btw
[14:03] <Darkside> was VK5GR...
[14:08] <jcoxon> eeek water + electronics
[14:09] <jcoxon> :-P
[14:09] <Darkside> it survived
[14:11] <eroomde> cars with mechatronics are a nice thing
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[14:51] <juxta> hey Darkside
[14:52] <juxta> awesome, Grant did a great job with the video!
[14:52] <juxta> even better, there's no interview with me in it :D
[14:53] <jcoxon> haha
[14:55] <Darkside> haha
[14:58] <Darkside> juxta: i reckon i can borrow a dish and stepper mount from uni
[14:58] <Darkside> and make a tracking dish
[14:58] <juxta> nice
[14:58] <Darkside> then we can do 23cm ATV off the balloon :D
[14:58] <juxta> i spoke to Adrian about ATV gear
[14:58] <juxta> he said Grant's the guy to talk to
[14:58] <Darkside> ok
[14:59] <Darkside> i can build a transmitter from the minikits stuff
[14:59] <juxta> i've got live offline predictions running now
[14:59] <Darkside> but a receiver, not sure
[14:59] <Darkside> nice
[15:01] <juxta> got the car up on a hoist today too Darkside
[15:01] <juxta> managed to tear the flex pipe between the headers and exhuast, tear an engine mount & break a weld on the exhuast
[15:02] <juxta> nice roads up at Billatt ;p
[15:06] <juxta> okie doke - bedtime
[15:06] <juxta> night Darkside
[15:07] <juxta> afternoon to everybody else :)
[15:07] <Darkside> lol
[15:07] <Darkside> eek @ the car
[15:07] <Darkside> and yes, sleep tiem for me
[15:07] <Darkside> nn
[15:07] <Darkside> i've emailed grant about the ATV stuff
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[15:20] <jcoxon> ping DanielRichman
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[15:37] <mixio> Hi
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[15:38] <m1x10> lol
[15:38] <m1x10> i got cloned
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[16:33] <jonsowman> ping jcoxon
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[16:56] <jcoxon> hey jonsowman
[16:56] <jcoxon> you pinged
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[17:08] <jonsowman> you still want to launch next sat jcoxon ?
[17:09] <jcoxon> maybe,,,
[17:10] <jcoxon> the payload is coming along well
[17:10] <jcoxon> as in the gps/radio bit is all working
[17:10] <jcoxon> still need to do the PID code for the temp/heater/crystal bit
[17:11] <jonsowman> okay, well I'll need to let Churchill porters know a few days in advance
[17:11] <jonsowman> so by monday really
[17:11] <jcoxon> hmmm okay
[17:11] <jcoxon> tough one really
[17:11] <jonsowman> I can say "subject to weather" so cancelling is not a problem
[17:11] <jcoxon> oh okay
[17:11] <jonsowman> but if there is any chance at all of you wanting to launch, I need to let them know with a date & time
[17:12] <jcoxon> okay
[17:13] <jcoxon> lets go for Saturday
[17:13] <jcoxon> sunset is 16:22
[17:13] <jcoxon> so at altitude thats 17:20
[17:13] <jcoxon> and we should aim to float at 20km
[17:13] <jcoxon> so
[17:14] <jcoxon> 2m/s to 20km takes 166minutes
[17:14] <jcoxon> which is 2hrs 46mins
[17:15] <jcoxon> so we'd need to launch at 14:30 really
[17:15] <jonsowman> okay no problem
[17:15] <jonsowman> what size balloon? ie. how much He?
[17:15] <jcoxon> 1.5kg
[17:16] <jcoxon> payload super light
[17:16] <jonsowman> alright that's fine
[17:16] <jcoxon> and aiming for 2-3m/s
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[17:19] <jcoxon> ping fsphil
[17:21] <m1x10> jcoxon: 1.5kg is super light?
[17:21] <eroomde> has anyone here made or launches chinese lanterns before?
[17:21] <eroomde> m1x10: that's the balloon size
[17:21] <eroomde> rather than the payload mass
[17:21] <jcoxon> eroomde, you around 6/11/10?
[17:21] <m1x10> whats the payload size for super light?
[17:21] <eroomde> afriad i'm down here doing fireworkey things
[17:21] <jcoxon> 200g is my guess
[17:22] <jcoxon> eroomde, potential to track at some point?
[17:22] <m1x10> jcoxon 200g is tiny! what we will be the payload?
[17:22] <eroomde> i'll see if i can get a new icom by then
[17:22] <eroomde> will prod the chaps to buy it
[17:22] <jcoxon> eroomde, if not could borrow one of mine...
[17:23] <jcoxon> m1x10, just a gps, ntx2 radio, flight computer pcb and 2 banks of 4xAA lithiums
[17:23] <jcoxon> it might be a little more once you add the insulation
[17:25] <eroomde> jcoxon: if i had my radio i'd drive up to the top of the downs and see if i coul hear you from worthing
[17:25] <LazyLeopard> Ah, yes. It is a rather likely night for pyrotechnics, isn't it...
[17:25] <m1x10> jcoxon: super
[17:25] <eroomde> it'd be an absolutely perfect spot for floatiers heading to lemans
[17:25] <jcoxon> eroomde, indeed
[17:25] <m1x10> exotic pic: andromeda in infrared: http://antwrp.gsfc.nasa.gov/apod/image/0909/Swift_M31_large_UV70p.jpg
[17:25] <jcoxon> we could postpone it if people are going to be busy fireworking
[17:26] <eroomde> it is firework party night aye
[17:27] <fsphil> pong jcoxon
[17:28] <jcoxon> eroomde, we should launch peg VIII and get firework pictures
[17:28] <eroomde> indeed!
[17:28] <jcoxon> fsphil, i've implemented a check on gps lock status in dl-fldigi
[17:28] <fsphil> haha, now that would be neat
[17:28] <eroomde> maybe overflight midsomer common
[17:28] <jcoxon> but wanted to pick your brain
[17:28] <fsphil> nice - pick away
[17:29] <jcoxon> -> 99 to save boring channel stuff
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[20:01] <griffonbot> @jamescoxon: Planning a latex pinhole floater on 6/11/10 from Cambridge, UK using new ATLAS flight computer #arhab [http://twitter.com/jamescoxon/status/28920029762]
[20:05] <jonsowman> jcoxon: any details on the new flight computer?.
[20:07] <Upu> nice something to track :)
[20:08] <Hibby> jcoxon: I'll be listening
[20:08] <jcoxon> yeah its an advance of my old flight computer
[20:09] <jonsowman> we'll try and have the CUSF trakatron up & running
[20:09] <Upu> hey Hibby did I see a picture of some uber aerial ?
[20:09] <jcoxon> so its a custom pcb with an atmega168 (arduino bootloader), ntx2 radio and a power regulator
[20:09] <Hibby> Upu: that'll be me, aye
[20:09] <Upu> where is that based ?
[20:09] <jonsowman> jcoxon: nice, sounds good
[20:09] <jcoxon> under the ntx2 radio's crystal is a temp sensor + resistor heater to try and stabilise the frequency drfit
[20:10] <jcoxon> drift*
[20:10] <Hibby> Uni Strathclyde, Glasgow, Scotland
[20:10] <jonsowman> oh yes, how's the PID controller going
[20:10] <Upu> its very neat board
[20:10] <jonsowman> or P controller as it might actually be
[20:10] <Upu> Oh damn I'm not the furthest North any more :)
[20:10] <jcoxon> and then i'll use my falcom ublox GPS + breakoutboard
[20:11] <jcoxon> jonsowman, i've not actually done any of it - been debugging the gps code
[20:11] <jcoxon> which is all done
[20:11] <jonsowman> ah excellent
[20:12] <jonsowman> brb
[20:15] <fsphil> nor am I Upu :p
[20:15] <Upu> you further north than me ?
[20:15] <Upu> and any more dates for launch ?
[20:16] <fsphil> hehe, no idea - in terms of latitude I'm about level with Hartlepool
[20:16] <Upu> whats your latitute ?
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[20:17] <fsphil> 54.65
[20:17] <Upu> 53.75
[20:18] <Upu> So you win
[20:18] <Upu> just
[20:18] <Upu> :)
[20:18] <fsphil> ooh that is close
[20:18] <jcoxon> the launch will be dependent on weather of course
[20:18] <jcoxon> though i do like to take risks
[20:18] <fsphil> your not that far from me then
[20:19] <Upu> Yeah hopefully the weather will hold
[20:19] <jcoxon> would rather avoid europe
[20:19] <Upu> does the cold air assist in anyway ?
[20:19] <jcoxon> (apart from France)
[20:20] <eroomde> cold air will get you higher
[20:20] <eroomde> for a given balloon volume you have a higher density, so a higher density difference, so more lift
[20:20] <Upu> thought as much thx
[20:21] <eroomde> but i don't think ground seasons make much difference to air temp higher up
[20:21] <jcoxon> yeah, apart from the locations of high pressure systems
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[20:35] <griffonbot> @LVL1WhiteStar: RT @jamescoxon: Planning a latex pinhole floater on 6/11/10 from Cambridge, UK using new ATLAS flight computer #arhab [http://twitter.com/LVL1WhiteStar/status/28922328031]
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[20:40] <griffonbot> @cuspaceflight: RT @jamescoxon: Planning a latex pinhole floater on 6/11/10 from Cambridge, UK using new ATLAS flight computer #arhab [http://twitter.com/cuspaceflight/status/28922631452]
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[21:10] <Laurenceb> cold air changes the scle height
[21:10] <fsphil> ISS pass coming up in 10 minutes
[21:10] <Laurenceb> i dont think it makes any difference
[21:10] <Laurenceb> everything cancles out
[21:10] <Laurenceb> scale height/density
[21:11] <SpeedEvil> Cold air increases in clarity.
[21:11] <SpeedEvil> Oooh
[21:11] <Laurenceb> *scale height
[21:11] Action: SpeedEvil realises that with the bed where it is, the lights in the room off, nad the window open as it is, I wouldn't need to move at all to see ISS.
[21:11] <SpeedEvil> If it wasn't cloudy that is.
[21:11] <fsphil> yea clouded out here
[21:12] <fsphil> I'm hoping someone's on the radio - I got a 2m yagi now
[21:14] Action: Hibby would listen, but city centre ++ whip != good listening conditions
[21:16] <russss> speaking of trhe ISS http://www.guardian.co.uk/science/2010/oct/24/international-space-station-nasa-astronauts
[21:16] <russss> good article
[21:16] <Hibby> shame, looks like a good pass
[21:16] <russss> why didn't twisst alert me of it!
[21:16] Action: LazyLeopard hasn't heard voice from ISS for quite a while...
[21:17] <russss> LazyLeopard: we heard some during the last set of passes
[21:17] <russss> pretty clear on a handheld with a small whip
[21:18] <russss> it doesn't get really bright until next week
[21:18] <LazyLeopard> When you say last set, do you mean tonight, or a month back?
[21:18] <Laurenceb> are they on 434?
[21:18] <russss> LazyLeopard: I mean 1-2months ago
[21:18] <russss> when it was visible in the evening from europe
[21:19] <LazyLeopard> Yeah, I heard them then on several occasions, but didn't manage to get myself heard.
[21:19] <russss> Laurenceb: 145.800 downlink
[21:19] <russss> 145.825 packet
[21:19] <fsphil> they've been active over the US these past few nights
[21:20] <LazyLeopard> Yeah, apparently. Not over Europe, however. :/
[21:21] <russss> I dunno what schedule they're sleeping at the moment
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[21:21] <russss> they'll probably be stepping over to UTC-5 soon to meet the shuttle
[21:21] <fsphil> not hearing anything yet
[21:22] <fsphil> packet
[21:22] <fsphil> ah well
[21:22] <russss> yeah you can usually hear the packet pretty well
[21:22] <fsphil> yep, nice and clear
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[21:24] <LazyLeopard> Shuttle launch on Monday?
[21:25] <fsphil> is there a linux app to decode packet?
[21:25] <jcoxon> eroomde, who would have imagined 61 people on this channel
[21:25] <jcoxon> on just an evening
[21:26] <Hibby> fsphil: depends on the packets
[21:26] <Hibby> for APRS//AX.25 you'd be well to look into a soundmodem and XAstir combination
[21:26] <LazyLeopard> Of course the outdoor antenna on the side of my house is a vertical, so not much good for listening in to a hight elevation pass.
[21:27] Action: jcoxon shakes at the thought of soundmodem - so many hours lost...
[21:27] Action: Hibby found it nice and easy to stick on several machines
[21:28] <jcoxon> Hibby, not on an embedded system :-p
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[21:28] <russss> LazyLeopard: well my, yes it is
[21:28] <russss> I thought it was the week after
[21:28] <fsphil> soundmodem won't start anyway :)
[21:29] <LazyLeopard> I'm getting something at just below discernable levels. Think it's someone calling CQ ...
[21:29] <fsphil> listen on 145.825-ish
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[21:29] <fsphil> they've only one radio so if it's packet, there'll be no voice
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[21:30] <LazyLeopard> Packet's on.
[21:31] <russss> fsphil: oh, really?
[21:31] <russss> I didn't know that
[21:31] <fsphil> well, only one amateur radio
[21:32] <LazyLeopard> So if I heard someone calling CQ, they were (a) on the ground, and (b) calling CQ on the downlink frequency, which isn't going to do much good...
[21:32] <russss> yeah, that sucks
[21:33] <Hibby> y'know what people are like
[21:33] <fsphil> you could put on an american accent.... nah that'd be evil
[21:33] <Hibby> we have a hell of a time on t'radio up here... half the repeaters are totally unusable due to spammers
[21:33] <fsphil> ham spammers?
[21:34] <Hibby> yep
[21:34] <Hibby> jammers/whatever
[21:34] <fsphil> the local repeater to me will occasionally go a bit nuts, sounds like a helicopter
[21:34] <LazyLeopard> Next pass at just before midnight local...
[21:34] <fsphil> not sure if it's someone jamming
[21:34] <fsphil> LazyLeopard, often the later passes are better
[21:35] <LazyLeopard> There do seem to be folks who get pleasure out of randomly triggering repeaters without actually saying anything...
[21:35] <jcoxon> lots of hte london repeaters have been closed down
[21:36] <jcoxon> as they kept getting hijacked with abuse and music
[21:36] <LazyLeopard> fsphil: yeah-ish. last time the passes btween 20:00 and 22:00 UT seemed to get the most activity.
[21:36] <LazyLeopard> jcoxon: tedious, that.
[21:37] <Hibby> we just have the problem that the RSGB don't really have much of a presence//OFCOM don't do much, so it's pretty prolific sadly
[21:37] <fsphil> seems to be fairly quiet in that regard over here
[21:38] <LazyLeopard> OFCOM seem to be wriggling out of as much of the interference control responsibility as they can...
[21:38] <Hibby> yeah, is a nightmare.
[21:39] <LazyLeopard> They shoved responsibility for investigating interference to broadcast over to the BBC, and they seem to do the nah-nah-can;t-hear-you dance for quite a bit of the rest (like the PLT issue).
[21:40] <LazyLeopard> (Meh. Should really check what I type before hitting <enter>...)
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[21:44] <Hibby> lol
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[21:49] <LazyLeopard> The old RA did a lot of work on powerline data transmission, and had drafted recommendations ready for appropriate action. Somehow it all got "lost" around the time RA was turned into OFCOM...
[21:54] <Laurenceb> how can i create a file if it doesnt exist already?
[21:54] <Laurenceb> on linux
[21:55] <fsphil> in C, or on the command line?
[21:55] <Laurenceb> as in what would a simple command line look like
[21:55] <Laurenceb> yes
[21:55] <fsphil> touch file
[21:55] <fsphil> creates file
[21:55] <fsphil> touch /tmp/blabla.txt
[21:55] <Laurenceb> ok cool, nice and simple
[21:55] <Laurenceb> hmm what if its a fifo?
[21:55] <fsphil> if the file exists, it updates the access time
[21:56] <fsphil> not sure what happens if you touch a fifo
[21:56] <Laurenceb> k nvm
[21:57] Action: Laurenceb is working on an enclosure
[21:57] <fsphil> (touch fifo updates the access time too)
[21:57] <Laurenceb> ive removed the pin headers and smd sma connector from a cc1020 eval board, and connected a bnc bulkhead with some coax pigtail
[21:58] <Laurenceb> should fit into a little alu box 20x40x80mm
[21:58] <Laurenceb> together with avr and usb
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[21:59] <Laurenceb> is there any 434 on the iss?
[21:59] <Laurenceb> was thinking of testing it to see if i could pick anything up
[21:59] <fsphil> the repeater apparently has a 70cm input
[22:00] <jcoxon> Laurenceb, use heavensabove to find out which other amsats are going over
[22:00] <fsphil> but I don't think it's been active in a very long time
[22:00] <jcoxon> more then just hte ISS
[22:00] <Hibby> probably won't be on
[22:01] <Laurenceb> could try with a hab from cambridge - theres some nice hills near here
[22:01] <Hibby> iss has an x-band voice repeater on 437.8MHz
[22:01] <fsphil> yea look out for VO-52, 70cm uplink, 2m downlink
[22:01] <jcoxon> Laurenceb, i'm planning to launch 6/11/10
[22:01] <Laurenceb> dunno if ill be ready it time, need a yagi
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[22:02] <fsphil> you can hear them on a vertical, though it ain't ideal
[22:02] <Laurenceb> not from long range
[22:02] <Laurenceb> with a cc1020
[22:03] <Laurenceb> well - if i calculated the noise figure correctly
[22:04] <fsphil> worth a try though
[22:07] <Laurenceb> 6dB
[22:11] <Laurenceb> prob 70% of the range of proper receivers
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[22:18] <fsphil> gpredict is a neat little satellite tracker
[22:24] Action: Hibby quite likes gpredict
[22:26] Action: LazyLeopard uses predict and gsat for quick visualisations, and sattrack to generate tables...
[22:27] <LazyLeopard> Ugh. The cops' chopper's about again...
[22:27] <fsphil> says FO-29 is going to just about peek above horizon in 5 minutes
[22:28] <fsphil> as long as it's not landing in the street :)
[22:28] <LazyLeopard> Noisy beast when it's flying round in circles nearby...
[22:29] <fsphil> yea it's annoying
[22:30] <LazyLeopard> Hmmm... I have FO-29 not making an appearance 'til 00:14UT
[22:30] <LazyLeopard> Wonder when I last updated elements...
[22:30] <fsphil> yea
[22:30] <fsphil> though it's only getting about 13 deg above the horizon here
[22:30] <fsphil> it has 70cm downlink, 2m up
[22:31] <fsphil> it's inverting -- does that man on 2m I'd need to use LSB?
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[22:33] <Hibby> likely to be fm
[22:34] <Hibby> nope
[22:34] <Hibby> im wrong
[22:34] Action: Hibby facepalms
[22:35] <Hibby> Usually above 14MHz (maybe...) it's USB, IIRC
[22:35] <Hibby> aye, above 40m is USB
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[22:39] <fsphil> satellites invert the signal, so to have it appear as USB on the downlink you need to TX LSB
[22:39] <fsphil> http://www.southgatearc.org/news/october2010/ho68_schedule_1010.htm
[22:40] <fsphil> reduces the effects of doppler apparently
[22:40] <Hibby> intreaguing
[22:41] <fsphil> didn't hear anything anyway :)
[22:41] <fsphil> probably too low, got some mountains to the north
[22:42] <fsphil> right, will wait for the iss pass then bed
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[22:57] <fsphil> packet again
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[23:01] <LazyLeopard> aye...
[23:04] <fsphil> g'night all
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[00:00] --- Thu Oct 28 2010