highaltitude.log.20110110

[00:00] <Darkside> spiralled downwards, and landed about 50m offshore - the parachute then caught the offshore wind, dragging it further out to sea
[00:00] <fsphil> ah I remember that
[00:00] <Darkside> im sure you were all watching :P
[00:01] <jonsowman> "picoatlas" - i like it :p
[00:01] <fsphil> the average speed for todays flight was 98km/s
[00:02] <jonsowman> :o
[00:02] <SpeedEvil> Wow.
[00:02] <fsphil> er
[00:02] <fsphil> km/h :p
[00:02] <jonsowman> i was gonna say...
[00:02] Action: fsphil has been messing up units allll day :)
[00:02] <SpeedEvil> oh.
[00:02] <jonsowman> hehe
[00:02] <fsphil> late nights and early mornings don't mix
[00:03] <SpeedEvil> I have no fucking idea what time it is.
[00:03] <jonsowman> jcoxon: you planning to put a chute on these things?
[00:03] <SpeedEvil> I woke up at 5AM, decided to go back to sleep for a couple of hours, woke up at 7pm, ...
[00:05] <juxta> yes, we did the whole 'superpressure'
[00:05] <juxta> thing accidentally on horus 8
[00:05] <juxta> floated at ~31km
[00:05] <Darkside> heh
[00:05] <jcoxon> jonsowman, streamer perhaps
[00:05] <jonsowman> jcoxon: yeah that's a good idea
[00:05] <jcoxon> as 100g isn't much
[00:06] <Darkside> hey juxta
[00:06] <jonsowman> indeed, chutes are not relatively that light
[00:06] <juxta> morning
[00:06] <Darkside> hopefully the radiometrix modules will arrive today
[00:07] <juxta> oh cool
[00:07] <Darkside> and im thinking of using VHF on my payload
[00:07] <juxta> did Jon get the FSA03's?
[00:07] <Darkside> no idea yet
[00:09] <Darkside> hrmm dont want to leave for uni yet, just in case the parcel arrives :(
[00:09] <Darkside> i shoud have got the damn things delivered to uni
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[00:14] <Darkside> oh yeah, jcoxon - could you explain how you're driving the NTX2's?
[00:14] <jcoxon> i'll go for the 2 pin + resistor network
[00:14] <Darkside> are you just using the resistors as a voltage divider, which you flip around?
[00:14] <Randomskk> out of interest
[00:14] <Randomskk> why not one pin and resistor network
[00:14] <Darkside> so you have one pin high, one pin low, that gives one voltage, then flip it over to give another voltage?
[00:14] <Randomskk> with the NTX2's input pin going 0V and 0.2V
[00:15] <Darkside> or are you using the 100kOhm impedance of the NTX2's pin
[00:15] <jcoxon> Darkside, yeah thats how i normally do it
[00:15] <juxta> Randomskk, the datasheet suggests centering around 1.2v i think
[00:15] <Darkside> jcoxon: what, the NTX2's impedance? or the divider
[00:15] <Randomskk> I guess, but doing it with one pin going high/low is easier and less resistors and all the rest of it
[00:16] <Darkside> if i get these modules today, i'm gonna have a play with the VHF one and see how i can get it working
[00:16] <Randomskk> and it still works
[00:16] <jonsowman> i never got an answer out of radiometrix about that
[00:16] <jonsowman> after they helpfully linked me to the cusf website :P
[00:16] <jcoxon> Darkside, the divider
[00:16] <Randomskk> I think you may have embarrassed them with that second email
[00:16] <jonsowman> haha
[00:16] <Darkside> jcoxon: ok
[00:16] <jonsowman> I think I might've
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[00:17] <Darkside> anyway, i'm betting the voltages required for 425Hz shift will be a bit different for the VHF module i'm using
[00:17] <Darkside> also i'll be operating on 151.7MHz, so hopefully 2M antennas will be good enough for receiving it
[00:18] <Darkside> ... and i hope i don't mess with the APRS digipeater >_>
[00:18] <Darkside> juxta: might need to talk to matt about that one
[00:18] <juxta> i'm not sure that it will be ready to fly for a while still
[00:18] <Darkside> ahh ok
[00:18] <Darkside> i *really* want to see that code
[00:19] <Darkside> becuase i have ideas for an APRS digipeater system on gliders
[00:19] <Darkside> operating at a different frequency of course
[00:19] <Darkside> but using AX.25 still
[00:19] <juxta> as for antennas, my dual band 70cm/2m is quite high Q on 2m, I think 151mhz would be pushing it, we'll probably have to cut some antennas to suit
[00:19] <Darkside> hmm
[00:19] <Darkside> ok
[00:19] <Darkside> but i figure i'll use VHF so you dont need to go reworking your board
[00:19] <Darkside> and 100mW will be fun to play with
[00:20] <Darkside> hopefully i can dial that down a bit
[00:20] <jcoxon> jonsowman, howabout using hte 868 uplink to be linked to twitter
[00:20] <jcoxon> and the 434 downlink to repeat the message
[00:20] <jcoxon> @picoatlas
[00:20] <Darkside> anyway, someone else is home now
[00:20] <Darkside> so i can safely go have a shower :P
[00:21] <jonsowman> that's a nice idea
[00:21] <jonsowman> how are oyu planning on doing the uplink system?
[00:21] <jonsowman> *you
[00:21] <jcoxon> i've got 2 radiomodems
[00:22] <Randomskk> that sounds like fun
[00:22] <jonsowman> right
[00:22] <Randomskk> can we use the 868 downlink to autotweet telemetry?
[00:23] <jcoxon> i got the dev kit for the modems in 2006
[00:23] <jcoxon> doubt you can get the modules anylonger
[00:25] <jcoxon> sure
[00:26] <jcoxon> i'll start a github repo tomorrow to keep the code
[00:28] <Elwell> The-Compiler: where abouts in .ch are you? (am near geneve)
[00:31] <jcoxon> night all
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[00:46] <Darkside> oh man lol
[00:46] <Darkside> aust post left the parcel in my letterbox
[00:47] <Darkside> juxta: radiometrix modules have arrived
[00:52] <Darkside> ok might catch the next bus into uni then, and test these things out
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[02:29] <MaDCaTz> Hey
[02:29] <natrium42> hi
[02:30] <MaDCaTz> randomsjj
[02:30] <MaDCaTz> randomskk*
[02:32] <MaDCaTz> dont know if anyone can help, im going to start building my high altitude baloon soon
[02:33] <MaDCaTz> but i dont want to fork out £100's on a UHF radio
[02:33] <MaDCaTz> would a UHF handheld work good enough?
[02:37] <natrium42> yes, you can also use the dl-fdigi/spacenearus network
[02:37] <MaDCaTz> how can i use that? ive come across that before though.
[02:38] <MaDCaTz> would they recieve the signals from my payload?
[02:38] <natrium42> people here are usually more than willing to help with tracking
[02:38] <natrium42> yeah
[02:38] <MaDCaTz> i plan to launch in scotland.
[02:38] <natrium42> are you in the ukhas mailing list?
[02:38] <MaDCaTz> no not yet
[02:38] <MaDCaTz> im on that website looking at info
[02:38] <natrium42> i'd shoot an email there
[02:39] <MaDCaTz> £400 - £500 for a reciever that i would probally use once is too dear for me
[02:39] <MaDCaTz> ill have a look
[02:39] <natrium42> the distributed system works very well, you just need to use the format
[02:39] <MaDCaTz> although i wouldnt think many people would be able to track it if its low to the ground
[02:39] <natrium42> its documented on ukhas wiki
[02:40] <MaDCaTz> yeah ive read that too
[02:40] <natrium42> kk good :)
[02:41] <natrium42> you can always go to the predicted landing coordinates
[02:41] <MaDCaTz> what sort of transmitter should i look at using?
[02:41] <natrium42> to get better signal for landing
[02:41] <MaDCaTz> NTX2 is what ive seen others use
[02:41] <MaDCaTz> so i could use a handheld, and connect that up to the laptop
[02:41] <MaDCaTz> ?
[02:42] <natrium42> yeah, its the workhorse tx ofuk people
[02:42] <natrium42> yep
[02:42] <MaDCaTz> nice
[02:42] <MaDCaTz> and would i need a good antenna/
[02:42] <natrium42> they are all asleep now it seems
[02:42] <natrium42> i am in canada
[02:42] <natrium42> :)
[02:42] <MaDCaTz> yeah i spoke to randomskk on youtube recently, who directed me here
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[02:43] <MaDCaTz> would i need a directional antenna?
[02:43] <natrium42> great, channel is usually more active at daytime in uk
[02:43] <MaDCaTz> ill be here all night and day
[02:43] <natrium42> directional is better
[02:43] <MaDCaTz> im very focused on this project since my dad has so much dout in me :D
[02:43] <SpeedEvil> MaDCaTz: where are you?
[02:44] <natrium42> you could build a simple onee
[02:44] <MaDCaTz> im in London
[02:44] <natrium42> google moxon
[02:44] <SpeedEvil> ah.
[02:44] <MaDCaTz> but here is a bad place to launch, im going to scotland in october
[02:44] <MaDCaTz> so plenty of time for this
[02:44] <MaDCaTz> ill google it now
[02:45] <natrium42> SpeedEvil and his messed up sleep cycle :)
[02:45] <MaDCaTz> lol, i work nights, my sleeping pattern is never the same each day
[02:45] <SpeedEvil> VEry, very. I just realised that I have a doctors appointment at 2:20 - 11 hours.
[02:45] <SpeedEvil> I'm unsure if I go to sleep again if I'll make it.
[02:45] <natrium42> hehe
[02:46] <MaDCaTz> do you guys know of a way to cheapy transmit video?
[02:47] <SpeedEvil> MaDCaTz: basically - video is hard.
[02:47] <MaDCaTz> even slow scan tv?
[02:47] <SpeedEvil> At least at ranges > a few hunderd meters
[02:47] <natrium42> there was a launch with live pics yesterday
[02:47] <SpeedEvil> slow-scan, and jpeg-over-slow-link has been done
[02:48] <natrium42> check out spacenear.us/tracker
[02:48] <natrium42> there is a link to pics
[02:48] <MaDCaTz> even a small jpg over 50 / 100 baud would take forever
[02:48] <natrium42> although unfortunately there was antenna problem....
[02:49] <MaDCaTz> wow nice
[02:49] <natrium42> i think it was 3-5mins per pic
[02:49] <natrium42> 300 baud
[02:49] <natrium42> encoded as jpeg
[02:49] <MaDCaTz> i dont mind buying a big arse balloon and sticking a large transmitter on it for live pictures
[02:50] <natrium42> i say use a digicam for 1st launch
[02:50] <MaDCaTz> im looking at hadie
[02:50] <natrium42> enough things to worry about :)
[02:50] <MaDCaTz> is that blue line where its traveled?
[02:50] <natrium42> yeah
[02:50] <MaDCaTz> ill be launching from near glasgow, i definaly dont want it to travel that far!
[02:50] <natrium42> contact was lost for a while because of problem with antenna on payload
[02:50] <MaDCaTz> how did they retrieve that?!
[02:51] <natrium42> they didnt yet
[02:51] <MaDCaTz> so thats being tracked by the towers?
[02:51] <natrium42> do you have a launch permission for that site?
[02:51] Action: SpeedEvil imagines little pics popping up on the tracker.
[02:51] <natrium42> yeah, thats the distributed system
[02:52] <MaDCaTz> not yet, its a few months away yet
[02:52] <natrium42> kk
[02:52] <MaDCaTz> whats the distance of it?
[02:52] <MaDCaTz> the range
[02:52] <natrium42> maybe you could launch from the already approved sites
[02:52] <natrium42> just talk to ukhas people
[02:52] <MaDCaTz> well it would be from the middle of nowhere
[02:53] <natrium42> bbl, going home
[02:53] <natrium42> at starbucks atm
[02:53] <MaDCaTz> alright
[02:53] <MaDCaTz> damn im gonna get a coffee
[02:53] <natrium42> welcome to the chan :)
[02:53] <MaDCaTz> thanks
[02:53] <natrium42> later
[02:53] <MaDCaTz> ill be here most the time lol
[03:00] <Darkside> ok, got this VHF module working
[03:04] <Darkside> not quite working at 300 baud, but thats more my receiver thats the problem
[03:11] <MaDCaTz> nice
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[03:25] <MaDCaTz> how accurate are those flight path predictions/
[03:25] <MaDCaTz> ?
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[03:39] <SpeedEvil> MaDCaTz: It depends.
[03:39] <SpeedEvil> MaDCaTz: +-20km?
[03:39] <SpeedEvil> Of that order
[03:39] <SpeedEvil> But that assumes everything goes right.
[03:40] <Darkside> and that the wind hasn't changed
[03:40] <SpeedEvil> If you over/underfill the balloon, and it ascends at the wrong speed, bursts at the wrong time, or the parachute doesn't work right...
[03:40] <SpeedEvil> then it can be quite a lot out
[03:40] <Darkside> at least the predictions on spacenear.us get updated throughout the flight
[03:41] <SpeedEvil> yes
[03:41] <SpeedEvil> So if you're following it in a car, it's not so bad.
[03:41] <SpeedEvil> As long as it can transform into a boat.
[03:42] <MaDCaTz> hmm
[03:43] <MaDCaTz> because the place i am going, apparently its going to land 100km into the north sea
[03:43] <MaDCaTz> ill have to stop somewhere along the way and launch it where there is moreland
[03:44] <SpeedEvil> Or wait a day or two till you get a more suitable forecast
[03:44] <MaDCaTz> also i plan to program a kinda fail safe, if it goes beyond a GPS long/lat range it will drop itself
[03:44] <MaDCaTz> but that relys on GPS
[03:44] <SpeedEvil> And a working cutdown
[03:45] <MaDCaTz> hmm i have a few ideas, eg burning the rope, or melting it with wire
[03:45] <Zuph> Heh, you guys have the opposite problem we have. Our balloons have a tendency to end up in inconveniently large trees. Water? Not as much a problem.
[03:45] <MaDCaTz> or a mechanical solution with servos
[03:45] <MaDCaTz> lol @ zuph
[03:45] <Zuph> Nichrome Wire = fool-proof cutdown.
[03:45] <SpeedEvil> MaDCaTz: servos tend to freeze at -40c
[03:45] <MaDCaTz> well im going to pack it out with hand warmers
[03:45] <Zuph> We recently dragged a balloon out of a 100ft tall beech tree.
[03:46] <SpeedEvil> Zuph: not quite - it can melt together through thick ropes
[03:46] <Zuph> SpeedEvil: Use thinner rope :-p
[03:46] <MaDCaTz> lol
[03:46] <SpeedEvil> I like a ceramic resistor specified to 350c operating temp
[03:46] <SpeedEvil> with a thin band pressed against it
[03:46] <SpeedEvil> of some polymer that melts around 100
[03:46] <SpeedEvil> c
[03:47] <MaDCaTz> i have loads of pyro stuff, fuse wire, ignitors, flash powder, im sure ill think of somthing ;)
[03:47] <MaDCaTz> it will come down as a fireball probally
[03:48] <MaDCaTz> i have a £200 digcam i plan to use with it
[03:48] <MaDCaTz> i dont need it anymore, it wont be much loss
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[08:45] <fsphil> is this channel logged somewhere?
[08:45] <SpeedEvil> I don't think centrally
[08:47] <fsphil> ah, I had logging enabled here
[08:59] <Laurenceb_> its logged by jcoxon
[09:00] <junderwood> http://www.habhub.org/zeusbot/
[09:12] <fsphil> just calculating an estimated burst altitude
[09:12] <fsphil> max known altitude was 30217 metres at 14:36. M0DTS/Rob said the thought it has burst at 14:51 from the way the signal changed
[09:13] <fsphil> ascent rate was pretty close to 3.5m/s, so the burst should have been at about 33.3km
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[11:13] <Laurenceb> hmm python script is sort of working now
[11:14] <Laurenceb> but cc1020 is reporting dodgy dBm values
[11:14] <Laurenceb> might be that i need to enable the rssi or something, more datasheet delving required
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[13:06] <NigeyS> afternoooooooooon
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[13:12] <fsphil> hidey Nigey
[13:15] <Laurenceb> anyone here tried freescale accels?
[13:15] Action: Laurenceb is not having fun
[13:24] <NigeyS> hey phil
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[13:36] <junderwood> Laurenceb, I used a MMA7260 accel from Freescale. It seems to do broadly what it's supposed to do
[13:37] <Laurenceb> seems to have an issue with i2c
[13:37] <junderwood> the MMA7260 is an analogue device
[13:37] <Laurenceb> im trying to use a bus pirate to talk to it - looks like it getting confused by start/stop on the i2c
[13:37] <Laurenceb> an
[13:38] <junderwood> Ah. I try to avoid I2C.
[13:41] <Laurenceb> the device adress is shifting 1 bit with each time i talk to it
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[13:53] <Laurenceb> http://www.sparkfun.com/news/487
[13:53] <Laurenceb> what
[13:53] <Laurenceb> so you cant actually buy stuff, you just try for credit?
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[13:59] <fsphil> you can buy stuff, just don't have to there and then
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[14:28] <GW8RAK> Just a quick question and completely off topic. Does anyone else have problems burning Ubuntu images to disk and then getting them to work?
[14:28] <GW8RAK> I need to burn 3 or 4 before I get one which installs okay.
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[14:29] <fsphil> sounds like a bad batch of disks
[14:29] <GW8RAK> I've not had problems with other images I've burnt otherwise I would consider the disks
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[14:40] <fsphil> there should be no other reason, other than bad disks or iffy burner
[14:40] <fsphil> unless they're getting corrupt on the computer
[14:40] <fsphil> but then they'd never work
[14:44] <junderwood> GW8RAK, the alignment could be different between your writer and ubuntu reader (assuming you are not using the same device)
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[14:45] <futurity> Hi Everyone
[14:45] <GW8RAK> Different devices junderwood and it is a bit puzzling.
[14:45] <junderwood> the burner and writer could be at opposite ends of the acceptable tolerance
[14:45] <junderwood> try a different reader or writer
[14:45] <GW8RAK> However my usual pc is a real bitsa and I'm wondering if there is some incompatibiltiy.
[14:46] <GW8RAK> That is my next plan.
[14:46] <GW8RAK> Just downloading the image at work and will see what happens with this newer pc.
[14:54] <chembrow> GW8RAK can you try a network install? Not sure if you can do that with Ubuntu, but it's how I usually install CentOS or Fedora
[14:55] <Randomskk> ubuntu can net install fairly easily
[14:55] <GW8RAK> I'm in the dark with that. Do you mean connect the pc to the network and install over it?
[14:55] <Randomskk> not /as/ easily though
[14:55] <Randomskk> GW8RAK: typically it means burning a very small disk image - or putting one on a USB stick - and booting off that
[14:55] <Randomskk> and then the computer downloads the files as it needs them to install
[14:56] <Randomskk> you can also boot the computer from the network itself, though that is a little harder to set up
[14:56] <chembrow> I usually run the ISO on either an NFS or FTP server
[14:56] <futurity> openSuse has a network install
[14:56] <futurity> very easy to install
[14:56] <chembrow> FTP might be easier as there are plenty of free servers for different OS
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[14:56] <GW8RAK> Yes, I think there is the optiono of a network install. I'll have a read about that tonight if this afternoons CD doesn't work.
[14:56] <Randomskk> ubuntu's net install is no harder than anyone else's, just its disk install is much easier
[14:57] <GW8RAK> A very positive way of looking at it Randomskk :)
[14:57] <chembrow> especially when a full install for a lot of other OS is getting over 5gb
[14:57] <chembrow> having to burn a dvd and cd just for the media is getting ridiculous
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[14:58] <Randomskk> beyond a single dvd is just silly
[14:58] <Randomskk> to be honest even that is a bit silly but doesn't make much odds to me
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[15:26] <Laurenceb> this i sslightly annoying
[15:27] <SpeedEvil> more fun with single digit picofarads?
[15:27] <Laurenceb> looks like freescale accels require 100KHz i2c with clk line inhibit
[15:27] <Laurenceb> anything else and the screw up
[15:27] <SpeedEvil> does the ds say that?
[15:28] <Laurenceb> nope
[15:29] <SpeedEvil> is this the lis303?
[15:31] <Laurenceb> no, MMAQ7455
[15:31] <Laurenceb> -Q
[15:32] Nick change: GeekShad0w -> GeekShadow
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[15:40] <Laurenceb> technically its i2c compliant
[15:41] <Laurenceb> just very annoying
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[15:57] <Laurenceb> buspirate needs to support clk line hold
[15:57] <SpeedEvil> It doesn't?
[15:57] <SpeedEvil> That's a bit annoying
[15:58] <SpeedEvil> Can you select stupidly low speeds?
[15:58] <SpeedEvil> What happens if you clock it at 1khz
[15:58] <Laurenceb> seems to stop working again
[15:58] <Laurenceb> the i2c spec allows your devices to only operate at certain speeds aiui
[15:59] <Laurenceb> at 5Khz it seems to be going out of sync with the clk line
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[16:11] <Laurenceb> ill probably forget it as it looks like noise is going to be similar to lsm303dl
[16:11] <Laurenceb> ordered some adxl345 instead
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[16:25] <junderwood> Laurenceb, adxl345 interfaces very easily. SPI!
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[16:45] <The-Compiler> Elwell: hey :) I'm in Winterthur, however I have a GA/AG and I travel in Switzerland a lot :p
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[17:28] <jonsowman> :75
[17:29] <jonsowman> oops, this ain't vim
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[18:00] <jonsowman> Randomskk: closed that github issue for the predictor
[18:00] <jonsowman> and changes pulled onto nessie too :)
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[18:01] <MaDCaTz> im trying to find a good place to launch from scotland, but i dont fancy it landing in the north sea
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[18:05] <MaDCaTz> whats the best landing predictor?
[18:07] <jonsowman> http://habhub.org/predict is the CUSF one that most people on here use I think
[18:07] <MaDCaTz> is there a way to enter the target landing area?
[18:07] <MaDCaTz> and it shows where to launch?
[18:07] <jonsowman> no, sorry
[18:07] <jonsowman> something I may implement in the future
[18:08] <jonsowman> you're not the first person to ask for it
[18:08] <MaDCaTz> would be helpful, in the UK not many nice places for it to land
[18:09] <jonsowman> a result from that would not be that useful, as you would then have to apply to the CAA for permission to launch at that site, which takes weeks, by which point the winds will have changed
[18:10] <MaDCaTz> at the moment, all the predictions fly east, would this be like this all year around, or would it change?
[18:10] <jonsowman> the general trend is usually east but there are occasions when it is not
[18:10] <jonsowman> they are not particularly frequent though
[18:11] <MaDCaTz> hmm
[18:11] <MaDCaTz> im planning to launch in october
[18:11] <MaDCaTz> months away yet
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[18:12] <jonsowman> it usually happens that you just need to pick a launch site and apply for CAA permission at least 1 month in advance. if, in the couple of days beforehand, it looks like it's going in the sea, then you have to call it off
[18:12] <jonsowman> there's not much getting around that
[18:12] <MaDCaTz> ah i see
[18:13] <MaDCaTz> or i could adjust it to burst lower
[18:13] <MaDCaTz> 20km instead of 30km
[18:13] <jonsowman> there are several things you can do to reduce the range
[18:13] <MaDCaTz> smaller balloon / more helium
[18:13] <jonsowman> indeed
[18:14] <MaDCaTz> i plan the nichrome wire
[18:14] <MaDCaTz> thing aswell
[18:14] <jonsowman> yep you can always perform a manual cutdown if it's going out to sea
[18:15] <MaDCaTz> whats the best way to do that? i thought with a phone but it wouldnt have signal
[18:15] <jonsowman> gsm coverage is sketchy at best above 5km
[18:15] <MaDCaTz> my idea was to stick it on a timer, to cut off after 1 hour 50 mins
[18:16] <jonsowman> that would also work
[18:16] <jonsowman> or you could use a radio uplink
[18:16] <MaDCaTz> or 5 mins after the planned burst
[18:16] <MaDCaTz> that gets expenice
[18:16] <fsphil> or use the gps, and set a safe zone - drift outside that and trigger the cut-down
[18:16] <MaDCaTz> or also using GPS, if it goes beyond a
[18:16] <MaDCaTz> ... yes lol
[18:16] <jonsowman> hehe
[18:16] <MaDCaTz> but thats if the GPS has a lock
[18:16] <fsphil> sorry, I'll get out of your head now :p
[18:16] <MaDCaTz> haha its fine
[18:17] <MaDCaTz> im going to use 2 GPS's
[18:17] <jonsowman> the GPS really should have lock at that point
[18:17] <fsphil> no lock and you won't know where it is anyway
[18:17] <MaDCaTz> true
[18:17] <MaDCaTz> ffs my monitors turned yellow
[18:18] Nick change: kleinjt -> kleinjt_
[18:19] <ejcweb> jonsowman: What receiver do we normally use for radio uplink to payloads?
[18:20] <jonsowman> ejcweb: the CUSF IC-7000 normally
[18:20] <jonsowman> as it can do 35W TX on 434MHz
[18:20] <jonsowman> and you really need that because the receiver sensivity on the balloon is pretty awful
[18:21] <jonsowman> so solve that by shoving a /lot/ of power down the Yagi pointed at it :)
[18:21] <ejcweb> No, what I mean is the actual receiver chip/module on the balloon?
[18:21] <jonsowman> oh, sorry
[18:21] <jonsowman> well, badgercub uses the CC1111 or something
[18:22] <MaDCaTz> whats a good transmitter to use, i only want 1 way
[18:22] <jonsowman> which is a radio-on-chip module and has an onboard receiver
[18:22] <jonsowman> but it can't be hacked to 50 baud
[18:22] <jonsowman> so there's a software discriminator that is fed by an integrator on the radio RSSI
[18:23] <jonsowman> and is "clocked" over a bit period
[18:23] <jonsowman> thereby generating a 50 baud serial signal which is then decoded by the microcontroller
[18:23] <jonsowman> MaDCaTz: Radiometrix NTX2
[18:23] <ejcweb> right, i see.
[18:24] <jonsowman> is the generally accepted one :)
[18:24] <jonsowman> ejcweb: there's information on the cusf wiki... somewhere
[18:24] <ejcweb> yeah, i found the CC1111 stuff, but wasn't sure if that was the only one.
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[18:24] <jonsowman> i think that's the only uplinkable payload we have at the mo
[18:25] <jonsowman> uplink has become a bit redundant these days, because landing prediction is so good
[18:26] <jonsowman> in that it's not longer a 'requirement', it's just an option if the payload has something that specifically requires it, or just as a technical exercise
[18:26] <jonsowman> s/not/no/
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[18:29] <MaDCaTz> the NTX2, ive had a look at this before, got arduino code for it aswell, just finding somewhere that sells it is hard work
[18:29] <ejcweb> Sorry jonsowman, lost my connection for a second.
[18:29] <jonsowman> no problems :)
[18:29] <ejcweb> I was wondering if it would be possible to have some sort of a module which outputs the raw audio for a certain frequency (without actually doing any processing on it or decoding to serial) which I could feed into the headphone socket of the Android (which also acts as a microphone).
[18:29] <jonsowman> MaDCaTz: go to radiometrix directly
[18:29] <jonsowman> send them an email, they're a really helpful bunch
[18:30] <MaDCaTz> ive sent them an email
[18:30] <MaDCaTz> hopeing to get one free :P
[18:30] <ejcweb> It was just something that crossed my mind and I wasn't sure if it was technically possible.
[18:30] <fsphil> basically a small SSB receiver ejcweb
[18:30] <jonsowman> ejcweb: technically do-able, sure :)
[18:30] <stilldavid> jonsowman, fsphil I'm trying to get sparkfun to carry the NTX2. good idea/bad idea?
[18:30] <jonsowman> MaDCaTz: it's definitely possible
[18:31] <jonsowman> they often do heavy educational discounts, and usually just ask for a project writeup for their website in return
[18:31] <MaDCaTz> i see a section on their page about sponsering students and amateurs
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[18:31] <fsphil> stilldavid, I've used a couple of 434mhz modules and it's definitely my fav
[18:31] <jonsowman> stilldavid: what sort of price would you be able to sell it for?
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[18:31] <MaDCaTz> i found somewhere that sells them for £15
[18:31] <NigeyS> evening peeps
[18:31] <MaDCaTz> in the US
[18:32] <MaDCaTz> everning
[18:32] <stilldavid> not sure, depends on radiometrix. probably similar to their site, but would be cool for us US peeps
[18:32] <jonsowman> stilldavid: definitely, they are excellent for HAB'ing
[18:32] <jonsowman> one thing I would say is that in the US you're allowed to use amateur radio on your HABs
[18:32] <NigeyS> and radiometrix are probably the most helpful and polite company i've ever dealt with :D
[18:32] <stilldavid> yeah, that's probably what we'd market them as. I'm triying to see if there are any other radiometrix modules we should carry as well
[18:32] <jonsowman> which is what most people tend to do
[18:32] <MaDCaTz> could i use the NRX2 module (reciever) and recieve the signals with that?
[18:33] <stilldavid> MaDCaTz, a more sensitive receiver is better, eg: one for ham radio
[18:33] <jonsowman> MaDCaTz: no, probably not - they're not sensitive enough
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[18:33] <jonsowman> stilldavid: would you be looking to stock a receiver/transceiver too?
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[18:33] <MaDCaTz> ah alright, i need to get myself a UHF reciever :\
[18:33] <stilldavid> jonsowman, that's what I'm thinking, yeah.
[18:33] <fsphil> maybe coupled with a pre-amp, but any nearby signal would wipe it out
[18:33] <MaDCaTz> £100's!! :(
[18:33] <jonsowman> I'm a big fan of the NiM2 since using it in Apex
[18:33] <MaDCaTz> yeah i see
[18:34] <SAIDias> woo hoo!
[18:34] <SAIDias> got my DTMF control circuit working
[18:34] <jonsowman> MaDCaTz: the FT-790R is a great starting radio
[18:34] <jonsowman> can be had on ebay
[18:34] <jonsowman> they tend to go for about £100
[18:34] <fsphil> +1 for the FT-790R
[18:34] <SAIDias> im able to control the 20M beacon from the ground
[18:34] <jonsowman> you just need one that can receive SSB
[18:34] <MrCraig> can anyone tell me if the output of a pic usart/uart can be fed directly into the ntx2 or do I need to provide an rs232 chipset such as max232? My understanding is that they are both cmos levels.
[18:35] <ejcweb> fsphil: So small SSB receiver modules exist?
[18:35] <jonsowman> stilldavid: I'm not sure how much people would use the NTX2 in the states, instead of amateur and APRS kit which is readily available and quite cheap these days
[18:35] <stilldavid> yeah. I'm building an APRS beacon around an HX1 right now actually
[18:35] <jonsowman> MrCraig: you need to turn the 0-5V output from the usart into suitable levels for the NTX2
[18:36] <fsphil> ejcweb, I've never seen one - but really they should
[18:36] <stilldavid> but that gets interesting when you have to start checking for ham tickets...
[18:36] <MaDCaTz> jonsowman: theres lots of bits of the FT-790R on ebay, not a whole one yet :P
[18:36] <fsphil> I'd be really interested in a small SSB transmitter module
[18:36] <jonsowman> feeding 0-5V in would result in far too large a frequency deviation - about 0.2V deviation is what you're after
[18:36] <MrCraig> jonsowman: simple transistor driver on the tx pin?
[18:36] <jonsowman> stilldavid: true, is the 434 band unlicensed in the US?
[18:36] <stilldavid> yes, it's ISM, right? don't know what the max power output is
[18:36] <fsphil> you may be able to get away with the 25mw model of the NTX2 in the US
[18:37] <jonsowman> stilldavid: 10mW ERP iirc
[18:37] <jonsowman> in the UK anyway...
[18:37] Nick change: SAIDias -> W0OTM
[18:37] <jonsowman> MrCraig: the current is sufficient to drive the pin
[18:37] <stilldavid> I think it's similar here
[18:37] <jonsowman> you just need to turn 0-5V into 2.0-2.2V
[18:37] <jonsowman> roughly speaking
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[18:37] <jonsowman> stilldavid: I would expect so - having different max powers in different countries for an ISM band would be silly
[18:38] <MrCraig> jonsowman: may I IM you?
[18:38] <stilldavid> true :) you might be right about the NTX2 just being popular in the UK though
[18:38] <jonsowman> MrCraig: of course
[18:38] <NigeyS> evening jcoxon :)
[18:39] <jonsowman> stilldavid: I don't know enough to really say, but being able to use amateur kit with the APRS infrastructure already available might discourage people
[18:39] <jonsowman> on the other hand, it opens up HABing to those without ham licenses, and is probably a relatively quiet part of the spectrum where you can transmit as much as you like without annoying every ham in the vicinity
[18:40] <stilldavid> hah, yes indeed :)
[18:40] <stilldavid> but to really use it, you need a good receiver
[18:40] <stilldavid> so it would really only attract hams
[18:41] <stilldavid> I thought there was a decent APRS network in the UK? 144.8, right?
[18:41] <W0OTM> it is not legal to transmit packet over ISM
[18:41] <W0OTM> or FRS
[18:41] <stilldavid> ah, there's another good reason
[18:41] <W0OTM> (ive looked into it)
[18:41] <jonsowman> stilldavid: there is, but we can't use amateur radio in airborne vehicles
[18:41] <W0OTM> its not legal to modify any FRS/GMRS radio
[18:41] <jonsowman> the APRS network itself is excellent
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[18:42] <stilldavid> jonsowman, now I remember that. that's a bummer
[18:42] <jonsowman> yeah it's a real shame
[18:42] <jonsowman> but it doesn't look like OFCOM are going to change that regulation anytime soon
[18:42] <fsphil> not enough money involved
[18:43] <fsphil> it's a shame they don't even allocate certain parts of the bands for amateur use, like they do with satellites
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[18:46] <MaDCaTz> whats the chances of getting caught lanching a balloon without permission?
[18:46] <MaDCaTz> launching*
[18:47] <fsphil> not worth it
[18:47] <jcoxon> MaDCaTz, please don't - you risk us all
[18:47] <MaDCaTz> im not going to, but im sure some people have
[18:48] <jcoxon> well its strongly discouraged
[18:49] <fsphil> dealing with the CAA is usually alright anyway
[18:49] <jonsowman> indeed
[18:49] <fsphil> and if they say no, it's almost certainly for a good reason
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[18:53] <MrCraig> I've heard of severe fines and even prison time in the US for an unauthorised launch, though in that case there was a passenger aboard so I guess it counts as a light aircraft.
[18:54] <MaDCaTz> ah
[18:54] <MaDCaTz> what do people think of this idea of attacking a small rocket to the balloon to be launched at its highest altitude, apparently it would travel far since less air resistance
[18:55] <SpeedEvil> It can work.
[18:55] <SpeedEvil> In principle, you can get to orbit.
[18:55] <jcoxon> MaDCaTz, its what quite a few people are working on
[18:55] <MaDCaTz> well you would need a big enough rocket though?
[18:55] <SpeedEvil> It's only worth it for the very smallest rockets though
[18:55] <SpeedEvil> And you do need a really advanced rocket
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[18:55] <SpeedEvil> It's by no means trivial
[18:55] <laurence_> hi
[18:55] <SpeedEvil> Ask him.
[18:55] Action: laurence_ has parrots
[18:55] <SpeedEvil> He's been looking at it.
[18:56] Action: SpeedEvil points at laurence_.
[18:56] <MaDCaTz> ive been into model rocketry, i have made my own by packing blackpowder, reached 1km from the ground
[18:56] <SpeedEvil> They are neat aren't they.
[18:56] <SpeedEvil> How many have you got?
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[18:56] <MrCraig> JP Aerospace are planning / have put up a semi-permanent launch platform for rockets - as I understand it the biggest problem is having a stable launch platform - the rockets are more or less point and shoot.
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[18:57] <MaDCaTz> say a rocket could go 1km high from ground, how high would it go in very low air pressure?
[18:58] <SpeedEvil> MaDCaTz: It utterly depends on the rocket.
[18:58] <SpeedEvil> And what the drag losses are.
[18:58] <MaDCaTz> hmm, ill leave it for another day lol
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[19:01] <MaDCaTz> i do quite like the idea of attaching a glider to a balloon to navigate back to base
[19:01] <MaDCaTz> but so much could go wrong
[19:03] <MrCraig> I had the same dream, rigid wing fiberglass glider - sadly though on the caa exemption the payload has to descend by parachute - and a deployment system would be a liability.
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[19:04] <MaDCaTz> hmm thats not good lol
[19:05] <MaDCaTz> actually you could use a parachute... with a glider attached
[19:05] <MaDCaTz> could still glide back
[19:05] <MrCraig> yeah lol - one sugestion I was given when I first posed the same question was - launch from international waters, no caa to worry about. Another was a parachute based glider which I believe a member here is working on and the university of cambridge is also working on.
[19:06] <MaDCaTz> http://www.members.shaw.ca/sonde/
[19:07] <MrCraig> looks like a perma chute attached
[19:07] <MrCraig> hmm, I'd have expected that to interfere
[19:08] <MaDCaTz> hmm
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[19:09] <MaDCaTz> landed 65m away from launch
[19:09] <MaDCaTz> not bad
[19:09] <MrCraig> yeah, impressive
[19:10] <MrCraig> right - I gotta run out for supplies, and might need to bleed the boiler too, it doesn't sound happy. back shortly.
[19:10] Nick change: MrCraig -> MrCraig_Away
[19:10] <MaDCaTz> alright,cya
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[19:29] Nick change: laurence_ -> Laurenceb_
[19:29] <Laurenceb_> parrot is very well built
[19:30] <Laurenceb_> the lcd is a bit flickery, but only close up
[19:30] Nick change: MrCraig_Away -> MrCraig
[19:30] <Laurenceb_> colours are half decent
[19:30] <Laurenceb_> - very wel built for £10
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[19:32] <Laurenceb_> arg stupid screws :(
[19:33] <Laurenceb_> uses triangular heads
[19:33] <SpeedEvil> It's not 10 quid
[19:33] <SpeedEvil> It's IIRC about 80
[19:33] <SpeedEvil> When really sold by QVC
[19:34] <SpeedEvil> They are neat though
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[19:36] <Laurenceb_> pity i cant take the back off - wanted to see if there was room for a lipo
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[20:05] Action: jcoxon has got his picoatlas breadboarded :-)
[20:05] <jonsowman> :D
[20:05] <jonsowman> yay
[20:05] <jcoxon> well just missing the ntx2
[20:06] <jcoxon> but thats teh easy bit
[20:06] <Laurenceb_> http://news.bbcimg.co.uk/media/images/50728000/jpg/_50728060_50728059.jpg
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[20:17] <MrCraig> well I did a 10 minute test and the new cnc controller board didn't explode yet, so that's better news than the previous board.
[20:21] <GW8RAK> A question for the Linux experts out there. I've installed Ubuntu 10.10 on this desktop machine, but there is no menu bar visible on the desktop. Alt-F1 brings up the menus, but it isn't the easiest thing to use. Does anyone have an ideas?
[20:22] <GW8RAK> I've googled the problem and some other people have found the same, but the explanations and solutions are not easy to understand for a Linux newbie
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[20:22] <chembrow> GW8RAK have you got a proper looking desktop apart from that with a background image?
[20:22] <GW8RAK> As far as I know, yes. There is just the plain 10.10 purple to black image
[20:23] <DanielRichman> GW8RAK: does it do this every time you start?
[20:23] <GW8RAK> Yes.
[20:24] <GW8RAK> A previous installation of 10.10 did flash the menu bar on startup, but haven't noticed it with this one.
[20:24] <chembrow> my first guess what was you were going into xterm rather than gnome - sounds like that's not the case.
[20:24] <DanielRichman> I was going to suggest alt+f2 => killall gnome-panel, but that would only do something if it didn't break every time
[20:25] <Laurenceb_> SpeedEvil: have you tried installing linux on the parrot yet?
[20:25] <DanielRichman> GW8RAK: can you link to a webpage with an explanation and a solution that you found but couldn't use ?
[20:25] <GW8RAK> This is the problem I'm having. Googling throws up terminology I just don't understand.
[20:25] <Laurenceb_> i havent got a spare sd card to use- will try tomorrow
[20:25] <Laurenceb_> wondering what appears on the screen
[20:26] <GW8RAK> DanielRichman - http://ubuntuforums.org/archive/index.php/t-415082.html
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[20:27] <DanielRichman> GW8RAK: so if you press alt+f2, you get a box asking you if you want to run commands?
[20:27] <chembrow> GW8RAK which flavour of ubuntu are you using? plain ubunutu, xubuntu, kubuntu
[20:27] <SpeedEvil> Laurenceb: It's already installed.
[20:27] <SpeedEvil> Laurenceb: though no - not yet
[20:27] <GW8RAK> I've tried the Alt-F2 and then "xfce4-panel" as suggested, but a window pops up with "cannot find..... etc.
[20:28] <GW8RAK> As far as I know, it is the plain Ubuntu downloaded from the website today
[20:28] <DanielRichman> ok GW8RAK, if you Alt+F2, and type "gnome-terminal" you should then get a terminal
[20:28] <chembrow> GW8RAK that page refers to xubuntu, which is ubuntu with the XFCE window manager. Standard Ubuntu uses the Gnome WM, not XFCE
[20:29] <GW8RAK> Yes, I have a terminal
[20:29] <DanielRichman> ok cool. What do you see if you type in:
[20:29] <DanielRichman> pgrep gnome-panel
[20:29] <DanielRichman> ?
[20:30] <GW8RAK> 1238 dad@dad-Evo-D500:~$ is what I get
[20:30] <jonsowman> pgrpe
[20:30] <jonsowman> oops, wrong window
[20:30] <DanielRichman> ok. Does anything change if you type
[20:30] <DanielRichman> killall gnome-panel
[20:30] <chembrow> DanielRichman this looks like a possible - http://www.ubuntugeek.com/ubuntu-tip-howto-recover-gnome-panel.html. I don't run gnome or ubuntu myself
[20:30] <GW8RAK> Well don DanielRichman. I have a menu bar!
[20:31] <DanielRichman> chembrow: I agree with you. You can run commands that only delete the gconf settings that refer to the panel though
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[20:31] <DanielRichman> ok GW8RAK that's a start :P. You say it doesn't show up on startup? I'm not totally sure how to fix that
[20:31] <GW8RAK> Any explanation or do I have to do that every time? I know that I shouldn't, but I'm still learning.
[20:32] <DanielRichman> well I can explain what those commands did, but I don't know why it's broken or why they worked :P
[20:32] <GW8RAK> That instruction kills all gnome processes does it?
[20:32] <DanielRichman> pgrep `process-name` searches for running processes with name `process name` and outputs their process id. I asked you to run this to see if there was a gnome-panel process running;
[20:32] <GW8RAK> So something was preventing the menu bar from appearing?
[20:32] Action: Laurenceb_ is compiling the kernel
[20:32] <Laurenceb_> *hardcore nerd action*
[20:33] <chembrow> GW8RAK have you ever had the menu bars?
[20:33] <DanielRichman> killall `process-name` does the same except it kills the processes it fins. gnome-panel is just one of the gnome processes; so it didn't kill all of them. However gnome-panel is special in that the gnome super process that looks after all its children will respawn it if it dies
[20:33] <DanielRichman> therefore killall gnome-panel has the effect of killing the currently running gnome-panel process, which is responsibel for the menu bars, and having another new one be created
[20:33] <GW8RAK> Not on this installation. Previously with Ubuntu 9 everything worked first time.
[20:34] <chembrow> try running "rm -rf .gnome .gnome2 .gconf .gconfd" from a terminal, then ctrl-alt-backspace to force a restart of X
[20:34] <GW8RAK> DanielRichman , first post is confusing, but I understand the second one.
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[20:34] <DanielRichman> chembrow: I don't think new ubuntus have ctrl-alt-backspace enabled
[20:34] <DanielRichman> does removing those folders not upset something if you do it while gnome is running?
[20:35] <chembrow> DanielRichman - it can't get any worse
[20:35] <DanielRichman> true. GW8RAK - is this a new install? doing that might clear out some application settings
[20:35] <chembrow> worst case, destroying the user account and recreating it should have the same effect
[20:35] <GW8RAK> Yes a completely new install
[20:35] <chembrow> forgot about ctrl-alt-backspace not being enabled any more.
[20:35] <DanielRichman> ok so you don't have anything to lose ;P
[20:36] <chembrow> "sudo pkill -HUP Xorg" has the same effect on RedHat based distros
[20:36] <DanielRichman> allright. rm -rf .gnome .gnome2 .gconf .gconfd and then log in & log out should work, chembrow ?
[20:37] <chembrow> DanielRichman should do
[20:37] <DanielRichman> worth a try
[20:37] <GW8RAK> Should I give that a try?
[20:37] <chembrow> GW8RAK go for it
[20:37] <GW8RAK> Thanks. back soon.
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[20:41] <GW8RAK> Interesting. It seems to go into a loop of producing the desktop image with a menu bar, black screen and then the plain desktop image appears and it asks me to log in again.
[20:42] <DanielRichman> are you logged into your ubuntu machine now?
[20:42] <chembrow> GW8RAK hmm, that user account must be corrupt
[20:42] <GW8RAK> By clicking anywhere on the menu bar when it is visible, the process(es) stop and normal operation continues
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[20:43] <chembrow> try creating a new user, see if that has the same effect
[20:43] <DanielRichman> mebe gnome get's a bit unhappy if you start messing with it while it's running. Creating a new user would be easier than trying to do things to the current one from a virtual terminal
[20:43] <GW8RAK> 205MB of updatas to download. Just like Windows !
[20:44] <GW8RAK> Okay, I'll try to create another user and see what happens
[20:44] <chembrow> from a terminal, use "sudo useradd username" then "sudo passwd username" if you can't do it from the UI
[20:45] <DanielRichman> System -> Administration -> Users and Groups
[20:45] <DanielRichman> it would be better to do it via that; you need to make the new user an administrator
[20:45] <DanielRichman> which is possible from the command line but more steps
[20:47] <GW8RAK> Sorry missed your posts there DanielRichman. Interestingly, it produces the menu bar with a new user AND when I came back to the original account.
[20:48] <GW8RAK> I'll close it down and see what happens when I reboot.
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[20:53] <GW8RAK> DanielRichman and chembrow - thank you very much for your help. Although the boot is a bit strange with distorted screens, it does boot quite quickly with menu bars, so problem solved.
[20:53] <GW8RAK> Okay, so this is Linux. What now?
[20:53] <chembrow> glad your working now
[20:53] <GW8RAK> Only joking. Just a steep learning curve and loads of frustration.
[20:53] <DanielRichman> pssh
[20:53] <chembrow> the curve can be a steep or as shallow as you want it really
[20:54] <DanielRichman> go install some programs from the ubuntu repositories
[20:54] <DanielRichman> it's the easiest way of installing software. ever.
[20:54] <chembrow> me, I'm a command line guy
[20:54] <GW8RAK> shallow is just steep but over a longer time period!
[20:54] <DanielRichman> Letting every vendor manage their own packaging is the dumbest idea ever. >:D
[20:54] <DanielRichman> * and updates
[20:55] <GW8RAK> On version 9, I found that some software installed very easily and it was great. But when it came to a command line installation, that was a black art which I never did master
[20:55] <chembrow> GW8RAK compilation does tend to be something that either just works or is a complete PITA
[20:56] <GW8RAK> By compilation do you mean that by adding new software, I am in effect producing my own version of Ubuntu?
[20:57] <GW8RAK> i.e. it is built into the OS rather than just sitting on top of it?
[20:57] <chembrow> no. when you install software you can do it two ways.
[20:57] <DanielRichman> when you install software using synaptic or aptitude you're downloading binaries that have been made by a canonical build server
[20:57] <DanielRichman> the difference to windows is that software that comes with the operating system manages the installation and uninstallation (it's called dpkg)
[20:57] <chembrow> or you can download the source and compile those binaries yourself
[20:57] <DanielRichman> i.e., on windows, every company ships their own installer, cruft, trash, etc.
[20:58] <DanielRichman> on linux, a program is a ".deb" file which is installed. It's not part of the O.S.
[20:58] <GW8RAK> That is what I want to do with the AX.25 "add-on"
[20:58] <chembrow> DanielRichman on a debian based distro it's a .deb file :p
[20:58] <DanielRichman> yeaaaah but all other distros suck, right >.>
[20:58] <chembrow> wash your mouth out!
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[20:59] <chembrow> (been using redhat since RH7 - I can't work other distros)
[20:59] <DanielRichman> I absolutely detest redhat. But we'll leave it there ;)
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[21:00] <GW8RAK> I remember on Ubuntu 9 going to the music player and seeing all the music my son had downloaded.
[21:00] <GW8RAK> No wonder I had a letter about downloading from my ISP
[21:01] <chembrow> he needs to find a better source :p
[21:01] <GW8RAK> And better music
[21:04] <GW8RAK> Now I've got this working I can get started on a laptop or two
[21:05] <chembrow> hopefully the others will just work too
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[21:07] <GW8RAK> Hopefully. I'm still looking for a good contact manager package for Linux
[21:07] <GW8RAK> With it, I'd probably swap work over to Linux, but I can live without Act!
[21:07] <GW8RAK> ooops, can't
[21:08] <SpeedEvil> Does it work under wine?
[21:08] <chembrow> can't think of anything. All my contacts sit on an MS Exchange and then get synced to my phone
[21:08] <GW8RAK> I have considered that, but it would all depend on how it would do a mail merge from one to another.
[21:10] <GW8RAK> Ultimately it would need a customise Open Office database
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[21:43] <griffonbot> @nearsys: Robot arm directions are complete. I need to write directions for the AE360 sensor arrays. #robotics #ARHAB [http://twitter.com/nearsys/status/24582048937148416]
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[21:53] <fsphil> robot arms?
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[22:01] <jcoxon> whats teh disadvantage in having a 850hz shift?
[22:03] <fsphil> none that I can think of
[22:03] <jcoxon> fair enough - guess it takes up alot of the waterfall
[22:03] <fsphil> I think there may be advantages on HF, because of the fading
[22:04] <jcoxon> cool well i've breadboard up all the components now of picoatlas
[22:04] <fsphil> great idea -- I only got a chance to look over the wiki page today
[22:05] <fsphil> if it goes well I might be tempted to so something similar. I've got a spare balloon and some helium left
[22:06] <jcoxon> :-D
[22:07] <fsphil> just the bare essentials, go for an altitude record :)
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[22:11] <jcoxon> yeah, even this payload has some extra stuff it could get rid off
[22:11] <jcoxon> such as teh 868 radio modem
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[22:35] <jcoxon> picoatlas git repo : https://github.com/jamescoxon/PicoAtlas
[22:35] <jonsowman> :)
[22:35] <jcoxon> also got working code :-)
[22:36] <jcoxon> currently have it read the gps, parse, send over 868Mhz and send over 434Mhz
[22:39] <jonsowman> good stuff
[22:39] <jonsowman> sounds good :D
[22:41] <Darkside> jcoxon: how small is cmall?
[22:41] <Darkside> small*
[22:41] <jcoxon> currently about 80g
[22:41] <Darkside> oh, you're using an arduino
[22:41] <jcoxon> could be smaller
[22:42] <Darkside> i was thinking of making an entirely SMD based payload
[22:42] <Darkside> well, except for the NTX2
[22:42] <jcoxon> then it could be tiny
[22:42] <Darkside> so they the board could be *Really* small
[22:43] <jcoxon> badger board is a tiny flight computer
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[22:43] <Lunar_Lander> hello
[22:43] <jcoxon> i mean badgercub
[22:43] <Darkside> could base it off the designs for the arduino nano's or something
[22:43] <jcoxon> http://www.srcf.ucam.org/cuspaceflight/wiki/doku.php?id=badgercub
[22:43] <Darkside> yesssssss party balloon :D
[22:47] <Lunar_Lander> xD
[22:50] <Zuph> jcoxon: Any info on that antenna? White star has been searching for a helical which is verified working with the Venus GPS.
[22:52] <jcoxon> Zuph, you'd have to ask the cu spaceflight guys
[22:52] <jcoxon> looks like a sarentel to me
[22:52] <jonsowman> Sarantel SL1204R
[22:54] <jcoxon> oh yeah it says it :-p
[22:55] <Zuph> hah
[22:55] <Zuph> So it does. Reading comprehension, right here.
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[23:03] <fsphil> 80 grams .. brilliant! how much more to be added?
[23:03] <jcoxon> fsphil, thats it
[23:03] <fsphil> my batteries alone weighed 75 grams
[23:04] <jcoxon> 2000mAh is 40g
[23:04] <jcoxon> that was me piling all the components onto a scale
[23:04] <jcoxon> so i'm sure it'll be more once constructed
[23:08] <jcoxon> fsphil, http://www.flickr.com/photos/jcoxon77/5344520160/
[23:10] <fsphil> very good, it looks heavier than it is
[23:11] <jcoxon> high chance it'll get heavier
[23:11] <fsphil> oh, I'm gonna send the £6 now -- how much extra do you need for postage?
[23:12] <jcoxon> its cool
[23:12] <jcoxon> don't worry about it
[23:13] <Lunar_Lander> jcoxon is that a full flight system?
[23:14] <jonsowman> looking good jcoxon
[23:14] <jcoxon> Lunar_Lander, yes
[23:14] <jcoxon> though on a breadboard of course
[23:15] <Lunar_Lander> looks cool!
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[23:27] <jcoxon> fsphil, just weighed it all 85g
[23:28] <fsphil> very impressive
[23:29] <jcoxon> once i get my seeeduino film i'll use that and that'll bring it down to 73g
[23:29] <jcoxon> of course once i start wiring it up and add insulation it'll shoot up
[23:30] <fsphil> yea the insulation can add a few grams
[23:31] <fsphil> does that already include the antenna weight?
[23:31] <jcoxon> the gps and 868 yes
[23:31] <jcoxon> not the 434
[23:34] <jcoxon> i'm actually thinking of using a dipole for this
[23:35] <fsphil> out the side?
[23:36] <jcoxon> depends how i build it i guess
[23:36] <fsphil> I can't picture a dipole mounted on the bottom, unless it's horizontally polarised
[23:37] <fsphil> well, the bazooka is a dipole I suppose
[23:37] <jonsowman> bazooka dipoles are cool
[23:37] <fsphil> yeah, wish I'd stuck with them :)
[23:38] <jcoxon> night all
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[23:40] <fsphil> hmm, have I got my antennas mixed up -- it's not a bazooka I'm thinking off
[23:42] <fsphil> ah, vertical bazooka
[23:45] <fsphil> I just need some way to stop it flexing as the payload spins
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[23:51] <griffonbot> Received email: "Rob, M0DTS" <rswinbank@gmail.com> "Re: micro balloon.."
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[00:00] --- Tue Jan 11 2011