highaltitude.log.20140807

[00:12] <snelly> is there any issue launching a Hwoyee balloon that I bought back in 2011?
[00:12] <snelly> do they go bad?
[00:12] <snelly> it's been in its cardboard box this whole time
[00:13] <SpeedEvil> Do they have expiry dates?
[00:13] <SpeedEvil> yes - latex goes off - is it in a foil container?
[00:15] <snelly> i'm not sure
[00:15] <snelly> i haven't opened it
[00:16] <Ian_> Just saw the IQ test question. Strikes me in the absence of any other instructions that it requires lines to be drawn from the object in the top row to the corresponding objects in the bottom row. Match the rotations. If I was one for drawing on my screen I might try it further.
[00:21] <SpeedEvil> Hmm - I guess b66'll have intermittent comms till a bit after midday tomorrow. Going past newfoundland. Then likely day after tomorrow, coming up midnight, portugal
[00:21] <SpeedEvil> :)
[00:21] Action: SpeedEvil wonders if 64 is at the pole yet
[00:25] <lz1dev> http://ready.arl.noaa.gov/hypubout/123470_trj001.gif
[00:25] <lz1dev> what is the probablity of being at the north pole
[00:25] <N2NXZ> round and round she goes
[00:26] <N2NXZ> Question about batteries,where do some of you use for long lasting power hungry trackers?
[00:27] <N2NXZ> Arduino tracker/NTX2 for longest lasting power?
[00:29] <N2NXZ> I know,not too much one can do trying to get one of these to last a few days.
[00:33] <SpeedEvil> N2NXZ: lithium AA cells are pretty much the gold standard
[00:33] <SpeedEvil> Primary, that is
[00:33] <SpeedEvil> good capacity, low weight, work well at low temps
[00:34] <SpeedEvil> lz1dev: hah - one actually does end up at the pole
[00:36] <N2NXZ> So lithium is certainly great for low temperatures.Most are using energizer brand?So best to program to run for certain periods of time to save energy and calculate how long I want it to operate.
[00:36] <Ian_> http://www.energizer.com/batteries/performance-lithium/ultimate-lithium/Pages/aa.aspx
[00:37] <SpeedEvil> N2NXZ: yeah - work out how to do low power modes. What sort of balloon are you planning?
[00:37] <N2NXZ> The plan is to go low neck lift and get it to float as far as nature will take it
[00:37] <amell> hacker uses RTL dongle to unlock cars - http://www.dailymail.co.uk/sciencetech/article-2717010/Watch-hacker-unlock-car-WITHOUT-touching-attack-takes-just-10-minutes-complete.html
[00:38] <SpeedEvil> N2NXZ: while there have been floaters that last a long time, most burst in a day or two IIRC
[00:38] <N2NXZ> Hywoyee 1600 should float awhile if filled correctly I guess
[00:39] <N2NXZ> Do they burst due to latex break down?Or too high altitudes?
[00:39] <SpeedEvil> UV degraation seems fast
[00:40] <SpeedEvil> Or maybe balloon flaws at high stretch
[00:40] <N2NXZ> Not good
[00:40] <N2NXZ> So lowest lift is best chance
[00:40] <N2NXZ> for weakness that is
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[00:41] <N2NXZ> So many factors with a floater
[00:42] <N2NXZ> Well,going to do my best on this one,all that can be done
[00:43] <N2NXZ> Waht would the average time it would take to travel from NY to Europe using the higher altitudes?
[00:43] <N2NXZ> say 100mph average or les?
[00:43] <N2NXZ> less
[00:44] <N2NXZ> Of course,some months are faster speeds
[00:44] <N2NXZ> Going to be some guessing here
[00:45] <Ian_> At the moment the remnants of hurricane Bertha is likely to make the crossing a little faster than normal - I think
[00:46] <amell> or vice versa?
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[01:04] <N2NXZ> Leos balloons did what this guy did to playing guitar :) http://youtu.be/hb5QaCfm7bg
[01:06] <N2NXZ> Especially @ 4:25 into video ...ha ha ha
[01:08] <arko> habhub/snus is dying
[01:10] <N2NXZ> Sleepy time for most,me too,catch you guys later.
[01:11] <arko> at 9pm?
[01:11] <arko> hah laterrzz
[01:11] <N2NXZ> I was up early
[01:11] <arko> i hear ya
[01:12] <N2NXZ> Tomorrow another day,was testing batteries all day with clear blue skies and solar cells...worked ok...see ya later
[01:12] <arko> nice
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[07:40] <LeoBodnar> good morning
[07:41] <LazyLeopard> Morning
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[08:09] <DL7AD> hi LeoBodnar & LazyLeopard
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[08:36] <SpeedEvil> :)
[08:36] <SpeedEvil> B63 - 30 days one hour.
[08:37] <SgtBurned> Wow.
[08:37] <SgtBurned> He's had a flight longer than most relationships nowadays :D
[08:38] <SpeedEvil> It's also closing rapidly on 40000km (circumference of earth)
[08:38] <SgtBurned> Awesome
[08:39] <SpeedEvil> It may already have exceeded it - given missing bits of log
[08:41] <DrLuke> how is it staying up that long?
[08:41] <DrLuke> isn't it slowly leaking helium?
[08:42] <SgtBurned> DrLuke, Leo is some evil mastermind.
[08:42] <SgtBurned> He's might even be using Cow's Methane just for the fun of it :)
[08:42] <SgtBurned> Any normal balloon would have popped days ago under the heat of the sun + the amount of radiation / gas?
[08:43] <fsphil> uv radiation will kill it eventually
[08:43] <SgtBurned> and aliens love to abduct balloons.
[08:43] <daveake> Then he'll be able to launch another one :)
[08:44] <fsphil> haha yea, the L band is currently full up
[08:44] <daveake> :)
[08:44] <fsphil> if he launches enough they can track themselves
[08:44] <DrLuke> hah
[08:44] <SgtBurned> haha, sort of like a relay network?
[08:45] <DrLuke> that would be an interesting concept
[08:45] <fsphil> indeed
[08:45] <SgtBurned> it sounds like a challenge...
[08:45] <SgtBurned> but I guess thats why he has APRS :)
[08:45] <fsphil> "The Send A Packet Around The Hemisphere Challange"
[08:46] <fsphil> without using ground/space stations
[08:46] <SgtBurned> LASERS
[08:46] <fsphil> or storing it longer than 1 minute at each point
[08:46] <daveake> The Leo Conspiracy Theorist will have a field day with that one
[08:46] <DrLuke> it's easy, just reverse the polarisation and phase shift on a household handheld laser and point it at a 33.4° angle into the athmosphere
[08:46] <DrLuke> the laser will bounce once around the earth
[08:46] <SgtBurned> shhhh they'll hear you dave. They're willing to take people away who talk badly of him.
[08:47] <SgtBurned> DrLuke, What about clouds & distortion? The amount of error would be in the miles xD
[08:47] <DrLuke> that's what the reversed phase shift is for
[08:47] <SgtBurned> *muffled screaming*
[08:47] <DrLuke> it corrects for all meteorological drift
[08:47] <SgtBurned> Halp they're taking me--- *scream*
[08:48] <SgtBurned> I wonder if you can reflect the laser off the plate on the moon
[08:49] <DrLuke> no space, remember?
[08:49] <SgtBurned> Awww
[08:49] <SgtBurned> Does it really count as a "Station" though?
[08:49] <fsphil> reflection wouldn't no
[08:49] <DrLuke> I wonder how accurate you have to point your laser at the reflectors to actually hit them
[08:50] <fsphil> station would be something that repeats it rather than just reflecting the rf
[08:50] <DrLuke> Although, it's more of a question of power I think, since the beam would spread quite a lot
[08:52] <SgtBurned> Dreams Luke. Dreams.
[08:52] <DrLuke> The solution is obvious
[08:52] <DrLuke> we need a laser that is powerful enough to illuminate the entire moon
[08:53] <fsphil> both sides at the same time?
[08:53] <DrLuke> yes
[08:53] <fsphil> reflect it of jupiter?
[08:53] <DrLuke> but with only one laser
[08:53] <DrLuke> why not blow up jupiter
[08:53] <DrLuke> and then illuminate the moon
[08:54] <fsphil> yea what has jupiter ever done for us
[08:54] <DrLuke> nothing really
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[08:54] <DrLuke> All it does is munch asteroids all day long
[08:54] <arjun_122> How important is it to have a cut down device
[08:55] <SgtBurned> Pfft, More like STEAL OUR ASTEROIDS
[08:55] <SgtBurned> arjun_122: Not very, all a matter of function and whether you would risk it tangling the parachute cords.
[08:56] <arjun_122> Sgtburned how much of a risk would you consider it
[08:56] <SgtBurned> Not much of a risk, Flights I was part of didn't have a cut down and they did just fine.
[08:57] <SgtBurned> not counting the alien abduction
[08:57] <arjun_122> Okay, thanks
[08:57] <SgtBurned> No problem
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[08:57] <DrLuke> SgtBurned: That poor balloon probably got an anal probe
[08:58] <SgtBurned> :( I'd rather not think or the poor little balloon and what they did to her.
[08:58] <SgtBurned> Frightened it to death the poor sod. Didn't speak to us for weeks.
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[10:42] <joeman> Lo
[10:42] <joeman> anyone tried a cutdown mechanism like the one shown at bottom of this post?
[10:42] <joeman> http://leederville.net/hab/?p=339
[10:43] <joeman> rests inside of balloon - nichrome wire
[10:43] <joeman> i.e. not at throat
[10:47] <craag_philcrump> One purpose of the cutdown can be to free the balloon so it doesn't foul the parachute
[10:47] <mfa298> I think most people here use nichrome wire to cut through the nylon string between parachute and balloon instead
[10:47] <joeman> yeha. this idea won't stop the fouling of parachute :(
[10:47] <joeman> yes.
[10:48] <joeman> sine regs say the balloon envelope needs to be extingished
[10:48] <joeman> some
[10:49] <joeman> seen a lot of ideas where nylon rope is cut
[10:49] <joeman> (melted)
[10:49] <craag_philcrump> Yep, quite easy to do with a few AA batteries and a mosfet.
[10:51] <joeman> yes, I probably should have used a SSR in my one, but have a mechanical relay
[10:51] <craag_philcrump> relay is fine - just heavier :)
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[10:53] <joeman> ahh yes!
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[11:18] <Ian_> Aviator = one who flies (pilot). Apis = to do with bees. Apiator = Leo that flies B##s.
[11:19] <Geoff-G8DHE-M> :-)
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[12:26] <ea5dom> Sven did it again ! Got a monitor on the Canadian "Finis Terra". Tnx to VO1BIL for the B-66 APRS reports
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[13:07] <fsphil> any predictions for where B-66 might appear again?
[13:08] <mattbrejza> /mt -> hysplit :)
[13:08] <mattbrejza> iirc spain again
[13:08] <fsphil> aah cool
[13:08] <fsphil> yea spain
[13:09] <mattbrejza> tomorrow evening
[13:09] <mattbrejza> pretty speedy this time
[13:16] <Laurenceb_> any matlab/octave gurus?
[13:17] <Laurenceb_> im trying to align a plot with a plotyy using subplots/whatever
[13:17] <Laurenceb_> and failing epically
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[13:22] <MaXimaN> I wonder if B-64 is circling the arctic, er, circle
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[13:25] <SpeedEvil> MaXimaN: Could be
[13:25] <SpeedEvil> One of the tracks does show it actually hitting the pole
[13:25] <SpeedEvil> It could end up in canada, russia, or china.
[13:25] <SpeedEvil> It's a bit unfortunate that the track-log is not 16 days.
[13:26] <SpeedEvil> But - that would have been quite rediculous at the time of launch
[13:26] <SpeedEvil> Now - with it looking increasingly likely that it's plausible that most of this design may make a month...
[13:32] <MaXimaN> Heheh indeed
[13:33] <MaXimaN> I was wondering about Leo's GPS 1/4 wave dipole. I guess you wouldn't want that located at the top of the tracker and potentially getting tangled up in the lines
[13:33] <cm13g09-work> SpeedEvil: Yeah 1 month ago, needing anything more than a day or two's backlog would have been unthinkable.... now 30 days sounds more reasonable!
[13:34] <SpeedEvil> On a related matter.
[13:35] <SpeedEvil> B63's log - with the flat bit beginning in canada
[13:35] <SpeedEvil> How long is missing?
[13:38] <mattbrejza> on snus clicking on a point tells you the datetime of that point
[13:38] <SpeedEvil> snus?
[13:39] <mattbrejza> 1.5 days
[13:39] <mattbrejza> spacenear.us
[13:39] <MaXimaN> snu snu!
[13:39] <SpeedEvil> Ah
[13:39] <SpeedEvil> I haven't been using that for a while, as it's never worked. (FF)
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[13:41] <mattbrejza> so lost contact 7pm 28th, regained 11am 30th
[13:42] <mattbrejza> 10am rather
[13:42] <SpeedEvil> So looks like just a curve, rather than a more elaborate wandering . Thanks
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[14:06] <Boelle_DK> Hi all.... a q about the raspberry pi... i know its not able to decode, but how far off is it? would a slight overclock help it? or where is the culprit with it?
[14:07] <fsphil> in my very unscientific tests the biggest cpu user in fldigi was the UI
[14:07] <Boelle_DK> hmm....
[14:08] <Boelle_DK> so might be possible....
[14:08] <SpeedEvil> I've used it on a similar platform - not dl-fldigi - and it worked
[14:08] <SpeedEvil> Waterfall is out
[14:08] <SpeedEvil> however - spectrum display was lots lower in CPU
[14:08] <Boelle_DK> me thinking that i could make do with slight overclock and give the graph side of things more ram...
[14:09] <SpeedEvil> Unlikely
[14:09] <Boelle_DK> then again, if remote controlling it there might be other things to consider
[14:09] <SpeedEvil> it's not using the GPU at all, it's all renederd on the CPU
[14:09] <Boelle_DK> oki
[14:10] <Boelle_DK> so in fact more ram to system if anything...
[14:10] <SpeedEvil> RAM is not an issue
[14:10] <SpeedEvil> Or is unlikely to be one
[14:10] <SpeedEvil> Obvious alternative is to just use it to pipe sound to a more capable PC
[14:10] <Boelle_DK> no its more if i'm going to remote control it anyway
[14:11] <Boelle_DK> yep... the pipe idea is also one i have thought about
[14:11] <Boelle_DK> but those 4G dongles are nasty, most ISP's here dont issue a public ip
[14:12] <fsphil> beagle bone black may be better
[14:12] <Boelle_DK> mostly to prevent people running servers
[14:12] <fsphil> it has a better cpu
[14:12] <Boelle_DK> that i think would be my biggest concern
[14:12] <Boelle_DK> i know i can do reverse SSH
[14:12] <mattbrejza> i dont really think its a case that the rpi cant decode rtty and much as the decoding program isnt at all efficient
[14:13] <mattbrejza> doesnt help if this is from a dongle also
[14:13] <SpeedEvil> ^above platform mentioned was a nokia n900 phone
[14:13] <mfa298> I don't think a slight overclock will make dl-fldigi work. If you could make it 2x or 3x the normal speed then maybe
[14:13] <SpeedEvil> Thisis 256M/600MHz clock
[14:13] <SpeedEvil> And it was running under X
[14:13] <mattbrejza> mfa298: did you try my java decoder with a different JVM?
[14:14] <mfa298> I started playing last night but got to the point of needing a audio calbe to get any further
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[14:14] <mattbrejza> also bear in mind one of the conference workshops is getting a rtty decoder on a stm32 micro
[14:14] <Boelle_DK> Q: given that the dongle prop will not allow me to contact it, what are my options actually?
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[14:14] <mfa298> it looks like the default jvm is oracle anyway. But there is a choie of 7 (default) or 8
[14:14] <Boelle_DK> i can do reverse ssh
[14:15] <mattbrejza> so might work with the waterfall turned off
[14:15] <mattbrejza> and i would have thought would certianlly be happy with AFSK
[14:15] <fsphil> that didn't help when I tried it oddly
[14:15] <mattbrejza> (no fft/AFC needed)
[14:15] <mattbrejza> im talking about my decoder
[14:15] <fsphil> could be something fltk was doing
[14:15] <fsphil> oh
[14:15] <mfa298> a java version with no w/f could be worth a shot.
[14:16] <mattbrejza> remind me when im at home
[14:16] <mattbrejza> its a right pita to build
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[14:16] <mfa298> when I had it connected to a fm only radio it detected a brief burst of noise as I opened the squelch
[14:17] <Boelle_DK> oh well... off to clean the yagi a bit more before i mark new holes
[14:18] <Boelle_DK> but open for ideas on how to place the yagi remotely and control it from home and do decode at home.... reverse SSH is doable, but i cant initiate connections...
[14:18] <Boelle_DK> pipe the sound home yes....
[14:18] <Boelle_DK> but how?
[14:18] <Boelle_DK> also are there other options?
[14:19] <mattbrejza> i still dont see why you need this remote control thing over putting it in your garden
[14:19] <Boelle_DK> cant vnc be done kind of reverse too?
[14:19] <Boelle_DK> no garden on first floor
[14:19] <mfa298> you've been given alternatives for control and audio already on #ukhasnet when you asked there
[14:19] <Boelle_DK> and buildings all arround me
[14:20] <Boelle_DK> a just half decent spot is a 15 mins car drive away
[14:20] <Boelle_DK> and sure it must be doable.... all i plan to have remotely is the pi, pan/tilt with yagi, sdr dongle
[14:21] <adamgreig> maybe use a colinear rather than a pan/tilt yagi
[14:21] <adamgreig> for all hab purposes it will work just as well and much more reliable and easier and lower power
[14:21] <Boelle_DK> not allowed either
[14:21] <adamgreig> you're allowed a pan/tilt yagi but not a colinear?
[14:21] <SpeedEvil> Most boring balloon related webcam?
[14:21] <SpeedEvil> http://www.ustream.tv/channel/nas-csbf-operations
[14:22] <Boelle_DK> the pan tilt will be out in nature far away
[14:22] <adamgreig> SpeedEvil: lol. do they do anything?
[14:22] <Boelle_DK> not out the window
[14:22] <adamgreig> Boelle_DK: yea, but I mean use a colinear instead of a pan tilt, far away
[14:22] <Boelle_DK> its not the pan/tilt that is the issue
[14:22] <adamgreig> sure, it's not an issue
[14:22] <Boelle_DK> its gettings the sound home so i can decode....
[14:22] <mfa298> If the Pi is going to struggle with just the decoder (dl-fldigi, java decoder) I think you'll really struggle if you're adding in sdr decoding and vnc as well.
[14:22] <fsphil> SpeedEvil: someone just walked across the room
[14:22] <adamgreig> I'm just saying a colinear is probably a better choice for that part of the design
[14:22] <fsphil> amazing
[14:23] <Boelle_DK> control can be done by reverse ssh
[14:23] <fsphil> why a pi?
[14:23] <Boelle_DK> small... easy to fit in small case etc
[14:24] <Laurenceb_> raspberry creampi?
[14:24] <nats`> Rpi is alway the bad choice
[14:25] <Boelle_DK> anyways off to mark new holes on yagi.... at least that one was total free/gratis
[14:27] <mfa298> I wouldn't say Rpi is always a bad choice but it has a lot of limitations to be aware of and lots of people want to make it do more than it can realisticly manage.
[14:31] <nats`> someone told him about electric safety for permanent outside electrical system ?
[14:31] <nats`> not sure he'll like to have a lightening on the ethernet going back home
[14:32] <qyx_> probably he is not going to have ethernet for that distance
[14:32] <fsphil> this is why my remote station is wireless :)
[14:32] <nats`> wireless on Rpi ?
[14:32] <nats`> :p
[14:32] <fsphil> initially yes :)
[14:32] <nats`> you mean the Rpi must handle wireless usb dongle too :D
[14:32] <fsphil> the ethernet chip is on the USB bus too
[14:33] <fsphil> so it doesn't actually matter
[14:33] <mfa298> he was talking about 3G/4G
[14:33] <fsphil> aah
[14:34] <nats`> oO
[14:34] <fsphil> 3g is too expensive to do any fun things
[14:34] <qyx_> expensive?
[14:35] <fsphil> about £10 for 200mbytes on my current phone
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[14:36] <fsphil> more than enough for basic remote control like vnc
[14:36] <qyx_> here you can have 1GB for 20e, which is a bit more expensive
[14:36] <SpeedEvil> 3 has pay-as-you-go
[14:36] <fsphil> but not for streaming audio
[14:36] <SpeedEvil> 10 pounds for 1 gig. - 1p/gig
[14:36] <SpeedEvil> But
[14:36] <SpeedEvil> you can add a 15 quid topup to get you unlimited data for a month
[14:37] <fsphil> that's better
[14:37] <SpeedEvil> (you're only supposed to use it for phones)
[14:37] <fsphil> a dongle is a kind of phone :)
[14:37] <SpeedEvil> Sure.
[14:37] <qyx_> and phone with an antenna is still a phone
[14:38] Nick change: Steffann -> Steffanx
[14:38] <daveake> I'm paying £20 for 20GB
[14:39] <nats`> <fsphil> about £10 for 200mbytes on my current phone <=for that I'mhappy to be in france
[14:40] <nats`> free 3G and 4G
[14:40] <nats`> with a rate limit at 5GB by month
[14:40] <fsphil> that's excellent
[14:40] <qyx_> i also have "flat" 2.5G for 6e/month here
[14:40] <qyx_> not 3G :/
[14:40] <qyx_> they don't have unlimited 3G
[14:41] <fsphil> giffgaff used to do an unlimited service for £10, but only for "phones"
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[14:41] <nats`> fsphil in fact we have 20 euro/month free 3G/4G/call/message
[14:41] <nats`> :D
[14:41] <fsphil> not sure if they still do
[14:41] <nats`> and free to use as a modem
[14:41] <daveake> 3 have an "unlimited" for £15 but again for phones only. Tried one in a MiFi and it refused to work
[14:41] <daveake> But you can tether
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[14:46] <Boelle_DK> 3G is cheap here....
[14:46] <mfa298> I think I've got my phone onto a £10/month contract with unlimited data but no tethering :(
[14:46] <Boelle_DK> alone our phones have 5GB a month
[14:47] <Boelle_DK> and we dont come anywhere near it
[14:47] <Boelle_DK> but the issue is that 3G or 4G is not issued a public ip here
[14:47] <Boelle_DK> so hard to control anything....
[14:47] <Boelle_DK> but works a treat if you are at the 4G end
[14:47] <mattbrejza> just skype call it
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[14:48] <Boelle_DK> skype on a pi ? hehehe
[14:48] <mattbrejza> s/skype/*/
[14:48] <mfa298> three's PAYG+12 isn't bad for occasional use 12G that lasts for 12 months. Last time I had one of those I ended up streaming for a while on the last day to use up some of the remaining bandwidth
[14:48] <Boelle_DK> i know what skype is....
[14:49] <mattbrejza> i wasnt suggesting you didnt
[14:49] <Boelle_DK> but using the pi as the platform... its small etc... easy to make a box
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[14:49] <mattbrejza> so is a stm32f4
[14:49] <Boelle_DK> and i know i can do reverse ssh, its more the sound out the SDR
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[14:49] <fsphil> so is the motherboard from an old eeepc laptop
[14:50] <fsphil> and you can get those for nothing on ebay
[14:50] <mfa298> Boelle_DK: you seem to keep saying the same thing and asking the same questions (which you've already had answers for) why not go and try some of them out and see if they work or now.
[14:50] <fsphil> you definitly won't be doing SDR on the pi
[14:50] <mfa298> s/now/not/
[14:51] <mattbrejza> what balloon flights are you even trying to recieve :/
[14:52] <Boelle_DK> those that pass over denmark
[14:52] <Boelle_DK> last one i could not hear as i did not have anything out the field...
[14:53] <fsphil> what radio?
[14:53] <mattbrejza> by the time you get round to completing this leo would have got bored of balloon flights and moved on to sometrhing else :P
[14:53] <fsphil> you really have no chance with an rtlsdr on the pi
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[14:53] <Boelle_DK> its was an sdr on a win7 pc
[14:53] <mattbrejza> unless you wanted to learn dsp and c
[14:53] <fsphil> there's a challange
[14:54] <fsphil> it might actually work fine as a simple usb receiver
[14:54] <mattbrejza> i dont think itll be that difficult if you targeted it for the pi
[14:54] <mattbrejza> but cba etc
[14:54] <fsphil> rtlsdr > pi > stream 8khz USB audio out
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[14:57] <Boelle_DK> what is the issue with streaming the audio home?
[14:57] <fsphil> the raw i/q data is rather large
[14:57] <mattbrejza> the issue is getting the audio in the first place
[14:57] <fsphil> though I suppose it could be filtered and downsampled for streaming
[14:58] <Boelle_DK> what is large? counted in mbit/s ?
[14:58] <mattbrejza> yea all you realyl need to do is mix then CIC filter it down to 8ksps or so
[14:58] <mattbrejza> should be pretty low complexity
[14:58] <fsphil> 4mbit/s for the rtlsdr's 25000s/s mode
[14:58] <fsphil> 250000 even
[14:58] <fsphil> 4mbit/s not counting overhead
[14:58] <fsphil> so you'd probably want 6mbit/s
[14:58] <Boelle_DK> only 4 mbit/s ?
[14:59] <mattbrejza> "only"
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[14:59] <Boelle_DK> yeah "only"
[14:59] <mattbrejza> "lol"
[14:59] <mfa298> If you go for the full 2MHz sample width it's more like 30mbit/s
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[14:59] <mfa298> good luck keeping a constand 4mbit/s upload over 3G
[14:59] <on4bhm> anyone any ideas how to make custom foil balloon?
[15:00] <mattbrejza> heat sealer on4bhm
[15:00] <on4bhm> "melt" foil plastic shopping bags together
[15:00] <on4bhm> matt: do we mean the same?
[15:00] <mattbrejza> well ideally you would buy a roll of the material
[15:00] <mattbrejza> pretty much
[15:01] <on4bhm> where to look for such a roll?
[15:01] <mattbrejza> thats a question for leo
[15:01] <on4bhm> i have a roll of bags, which are used to lay into the bins at work
[15:01] <Boelle_DK> avg upload on a 4G connection here is at least 10Mbit/s.... isp's claim 20
[15:02] <mattbrejza> well no harm in making a few balloons and seeing what pressure they can take
[15:02] <on4bhm> i think they can be cut to little square pieces
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[15:02] <Boelle_DK> dinner time
[15:02] <on4bhm> how much pressure should i test? aiming for 12km hight
[15:02] <mattbrejza> Boelle_DK: how much data do you get?
[15:03] <Boelle_DK> currently i'm on 5GB a month
[15:03] <Boelle_DK> but can adjust as i need
[15:03] <mfa298> 4mbit/s will use that up pretty quickly
[15:03] <mattbrejza> 2.2GB/hour
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[15:04] <adamgreig> you really want to do the decoding near the radio and just send telemetry data over the internet
[15:06] <mfa298> or failing that just stream the audio over the internet as that should be mucl less than 4mbit/s
[15:06] <adamgreig> yea but rpi might be hard pushed to even get audio out of the sdr
[15:06] <SpeedEvil> http://www.alibaba.com/product-detail/METALLISED-NYLON-BOPA-FILM-USING-FOR_241062323.html?s=p
[15:07] <mattbrejza> £2k moq lol
[15:08] <Laurenceb_> i suspect you need EVOH
[15:08] <SpeedEvil> http://www.alibaba.com/product-detail/Metallized-Nylon-film-using-for-balloon_642530955.html much lower!
[15:08] <Laurenceb_> http://www.barrierfilm.co.uk/Evoh%20barrier%20films.html
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[15:09] <mattbrejza> hes left mind you :P
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[15:10] <mfa298> I got partway towards audio with rtl_fm but I'm not sure that their non FM modes actually work
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[15:15] <SpeedEvil> We should totally do a group buy from china.
[15:22] Nick change: nigelvh_ -> k7nvh
[15:22] <aadamson> SpeedEvil, - http://balloonkits.com/
[15:23] Nick change: k7nvh -> nigelvh_
[15:23] Nick change: nigelvh_ -> k7nvh
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[15:33] <SpeedEvil> https://twitter.com/pbdes/status/497396668283637761 Orbcomm CEO: SpaceX launch of our 6 sats was 0.005 deg frm 47deg inclination goal, 0.5km from apogee goal of 720km, 0.5km frm 620km perigee.
[15:34] <SpeedEvil> Orbcomm CEO on SpaceX launch precision: Doesnt get much better than this. 10kg of fuel reserved for maneuvers now can be used for service.
[15:35] Nick change: k7nvh -> nigelvh
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[15:43] <Ian_> Nah, group buy discourages large sequence of launches by an individual; just buy the two tonnes and get developing - fast! :) Lots of room for an empirical approach to envelope construction.
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[15:45] <SpeedEvil> The next big thing.
[15:45] <SpeedEvil> Balloons (of under 2m in diameter) commandable to raise and lower in height.
[15:46] <SpeedEvil> And a thingy that uses the forecast data to derive a path to get them to a target location
[15:46] <SpeedEvil> Stop me if I'm getting too technical.
[15:46] <SpeedEvil> :)
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[15:52] <amell> When is leo going to launch more Bs or has he given up now
[15:52] <amell> SpeedEvil: did you ask loon if you can steal their technology?
[15:53] <fsphil> the air has reached its B saturation point
[15:53] <x-f_> three B's is the maximum allowed in airspace
[15:53] <SpeedEvil> amell: it's pretty obvious
[15:53] <SpeedEvil> amell: I had the basically similar idea of doing lunar orbiters ages ago - surfing the lunar gravity field to maintain LLO.
[15:54] <amell> jededu: did you launch yet?
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[16:13] <Laurenceb_> i hate matlab
[16:13] <Laurenceb_> matlab need to die
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[16:31] <amell> write a tracker in matlab
[16:32] <jededu> amell no i am going to chase but the prediction says 100 miles
[16:32] <amell> sounds like youll have quite a wait before the next launch then, its getting worse.
[16:33] <jededu> I know :(
[16:33] <jededu> And I have NOTAMS all this month
[16:34] <jededu> For the big stuff
[16:35] <jededu> Where are you based amell
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[16:48] <amell> jededu: elsworth
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[16:53] <SHARP-SATS> B66 back in the UK by late Friday? http://weather.gc.ca/satellite/animateweb_e.html?imagetype=satellite&imagename=goes_enam_1070_m_..................jpg&nbimages=1&clf=1
[16:57] <SpeedEvil> Well - 'in the UK' is unlikely
[16:57] <SpeedEvil> 'at the same longitude' - sure
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[17:03] <SpeedEvil> Ok - making some simplifying assumptions. 12km altitude - 12km covered swath of terrain. 30000km - 10000 over land - that's 5000km or so over land in daylight - or about exactly 1/6000th the earth surface.
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[17:15] <harvy> Hi, could someone have a quick look at some code for me?
[17:16] <harvy> https://github.com/ManchesterSpaceProgramme/tx-rtty/blob/master/online_ublox_ntx2/online_ublox_ntx2.ino
[17:17] <harvy> and I have tried to covert it to use hardware serial : https://github.com/ManchesterSpaceProgramme/tx-rtty/blob/master/online_ublox_ntx2_hardwareserial/online_ublox_ntx2_hardwareserial.ino
[17:17] <harvy> I think I did it right, Basically just replaced GPS with Serial and removed any previous Serial printlns.
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[17:23] <Ian_> And your testing so far shows . . . ?
[17:24] <Dark-Fx> good thing he quit
[17:26] <Laurenceb_> any sed/whatever experts here?
[17:26] <Laurenceb_> i need to replace text between two tokens in file $1 with text from file $2
[17:31] <LZ1DEV> sed -i 's/text1/test2/g'
[17:31] <Dark-Fx> yeah, that won't do what he's asking
[17:31] <Dark-Fx> I don't know of a way to take values from one file and put them into another
[17:32] <LZ1DEV> it's hard without seeing the files
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[17:32] <Dark-Fx> probably have to generate a tertiary file
[17:32] <LZ1DEV> not really
[17:34] <Laurenceb_> ill see what i can manage
[17:34] <Dark-Fx> Laurenceb_: I don't think sed, at least alone, is the answer.
[17:35] <Dark-Fx> You might have to use cut, tr, etc
[17:35] <LZ1DEV> Laurenceb_: whats the format of the files
[17:35] <Laurenceb_> eps
[17:36] <Laurenceb_> im trying to work around a matlab bug
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[17:37] <LZ1DEV> can help, but i need specifics :)
[17:42] <Laurenceb_> ill see if i can fix it first
[17:43] <Dark-Fx> use matlab to fix the data
[17:43] <Laurenceb_> lol
[17:43] <Laurenceb_> how can i use head to remove a header?
[17:43] <Laurenceb_> -n -lines ?
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[17:44] <Dark-Fx> tail -n+1 file
[17:45] <Laurenceb_> -n+$lines ?
[17:45] <Dark-Fx> yeah
[17:45] <Dark-Fx> I assumed you only had one line as your header
[17:46] <Laurenceb_> hmm
[17:46] <Laurenceb_> i need to add one to $lines
[17:47] <harvy> Ian_, Well nothing really happens. Sometimes the arduino locks up but since I can't debug I don't know what is going on.
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[17:49] <Laurenceb_> http://pastie.org/9453627
[17:49] <Laurenceb_> works up to line 9
[17:49] <Laurenceb_> then it just seems to cp temp_epsc.epsc > $21
[17:49] <Laurenceb_> *$2
[17:50] <Laurenceb_> oh, newline
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[17:54] <Laurenceb_> yeah i dont understnad bash
[17:54] <Laurenceb_> start_string and stuff need to be variables
[17:55] <Laurenceb_> sed "/'$end_string'/rinputFile2
[17:55] <Laurenceb_> ^also fails, how do i fix this?
[17:55] <LeoBodnar> awk
[17:56] <LeoBodnar> awk can fix anything
[17:56] <Laurenceb_> heh
[17:56] <Laurenceb_> i dont understand how to pass variables
[17:56] <Laurenceb_> thats the problem
[17:56] <Laurenceb_> http://pastie.org/9453640
[17:57] <LZ1DEV> asd=1
[17:57] <LeoBodnar> to awk?
[17:57] <LZ1DEV> echo $asd
[17:57] <LeoBodnar> -v MYVARIABLE=value
[17:57] <Laurenceb_> to sed
[17:57] <Laurenceb_> well, where did i go wrong on lines 10,11
[17:57] <LeoBodnar> sed is not a procedural language
[17:58] <Laurenceb_> as lines 10,11 seem to be broken
[17:58] <Laurenceb_> its just copying the file to $2
[17:59] <LZ1DEV> what are you trying to replace?
[17:59] <Laurenceb_> corrupted graphics
[17:59] <Laurenceb_> so its inbetween the tokens on lines 3 and 4
[17:59] <LZ1DEV> which is located where in the file?
[17:59] <Laurenceb_> anywhere...
[17:59] <Laurenceb_> in terms of line number
[17:59] <LZ1DEV> but is between two tokens?
[17:59] <Laurenceb_> yes
[17:59] <LZ1DEV> ok
[17:59] <LZ1DEV> np
[17:59] <LZ1DEV> we use grep
[18:00] <LZ1DEV> you need -A and -B options
[18:00] <LZ1DEV> you grep for the first token, and -B will get you a number of lines ocntext before that so you set it 999999
[18:00] <LZ1DEV> this will get you all lines above the token
[18:00] <LZ1DEV> then you do the same, but with -A for the last token
[18:01] <LZ1DEV> finally you combine top + bottom
[18:01] <LZ1DEV> bam
[18:01] <LZ1DEV> you can do it in one line
[18:01] <Laurenceb_> this sounds more complex than my sed code
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[18:02] <LZ1DEV> cat <(grep -B 9999 "top_token" file) <(grep -A 9999 "bottom_toen" file) > new_file
[18:02] <Laurenceb_> ok
[18:02] <Laurenceb_> but i need to splice another file into the middle
[18:02] <Laurenceb_> thats rinputFile2 in my code
[18:03] <LZ1DEV> cat <(grep -B 9999 "top_token" file) middlefile <(grep -A 9999 "bottom_toen" file) > new_file
[18:03] <Laurenceb_> ok ill try it
[18:03] <Laurenceb_> thanks
[18:03] <harvy> Ok looks like Ian_ is AFK can anyone advise on why my hardware serial translation doesn't work?
[18:08] <Laurenceb_> got it thanks
[18:08] <Laurenceb_> its working with grep
[18:10] <daveake> harvy You don't appear to be reading the GPS data and you therefore aren't passing that data to tinygps for parsing
[18:13] <LZ1DEV> Laurenceb_: good luck doing that on windows
[18:13] <LZ1DEV> :)
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[18:26] <harvy> daveake: So the GPS is on 9600 and I just reading from that. And then I am just using TinyGPS gps and placing the values in the datastring
[18:27] <maxmed> Hi everyone, I want to test my code using test gps data, I read on the wiki that I need to download "Tro Sys Gps Simulator Free" but all the links I find don't work, I can never get to the stage of actually downloading all I get is links to other pieces of cr@p. Does anyone have a link that works?
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[18:33] <manhab> Looking for a long cabled IPX antenna for a ublox 6 breakout. Any recommendations?
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[18:36] <daveake> harvy No, you're not reading from serial. Take a look at the tinygps library. You need to pass serial port characters to it, so it has something to parse. At the moment you're asking it for a GPS position when it doesn't have any data to work from.
[18:37] <daveake> Strongly suggest you start with a simple program to read characters, send them to tinygps, wait for it to get a sentence, then do something with the results (e.g. send to serial port for debugging. And yes you can use the serial port for debug as well as gps)
[18:38] <daveake> Throw away the radio stuff and UBX stuff for now
[18:39] <daveake> maxmed I suggest you write a trivial PC program to read a GPS line from a file, send it, wait 1 second say, then send the next line, etc
[18:40] <daveake> If you're using Arduino, connected to the PC via USB, then you just open the USB serial port
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[18:41] <harvy> daveake: I have got something to read from GPS but only over softserial
[18:42] <daveake> The code you posted does not read from the GPS except in the UBX code
[18:43] <daveake> You need a loop which tests serial.available(), then if that's true it gets a character, sends it to tinygps, then loops
[18:43] <harvy> daveake: It's not in what I have posted, it was a seperate program. I thought it would be trivial to covert softserial to Serial.
[18:43] <daveake> Well it's kinda difficult to debug code that I don't see
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[18:45] <harvy> daveake: That was just a fairly trivial read from gps using tinygps and just output the sentance to Serial but I have now posted a more complex program to translate that to ntx2 and give more menaingful messages.
[18:45] <daveake> OK, what program doesn't work, and have you posted it here?
[18:46] <harvy> daveake: https://github.com/ManchesterSpaceProgramme/tx-rtty/blob/master/online_ublox_ntx2_hardwareserial/online_ublox_ntx2_hardwareserial.ino
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[18:47] <daveake> OK, my previous point remains. It's not reading the serial port and passing the data to tinygps
[18:47] <harvy> daveake: I thought the while loop in the setup would be reading from the serial port and then my loop would be using that to send it out via rtty.
[18:48] <daveake> OK, let's break it down (sorry to others for the spam) ...
[18:48] <daveake>
[18:48] <daveake> while (1) {
[18:48] <daveake> if (Serial.available()) {
[18:48] <daveake> Serial.read();
[18:48] <daveake> }
[18:48] <daveake> }
[18:48] <daveake> That's an infinite loop, and not a good one
[18:49] <daveake> It reads and bins every character
[18:49] <daveake> Fortunately it's in a function that's not used
[18:50] <daveake> The only other serial.available() is in the UBX code
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[18:50] <daveake> You have *no* other serial.read
[18:51] <daveake> You have *no* code to send the serial characters to tinygps
[18:51] <daveake> Therefore tinygps has no data to work with
[18:51] <daveake> There may be other stuff but I have food to go eat
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[18:56] <qyx_> manhab == harvy?
[18:57] <harvy> qyx_, Yup, I was logged in twice asking two different questions.
[18:57] <Laurenceb_> lol manhab
[18:57] <Laurenceb_> inb4 femhab
[18:57] <Laurenceb_> sluthabs
[18:58] <mattbrejza> tranhabs
[18:58] <mattbrejza> lets be inclusive now
[18:59] <Dark-Fx> manhabib
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[19:05] <qyx_> why do you change your nick to ask more questions?
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[19:28] <harvy> qyx_, I was trying to multi task and not get people confused as to which question they were answering or what I was asking.
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[20:02] <fsphil> http://www.planetary.org/blogs/emily-lakdawalla/2014/08071214-twinkling-worlds-in-motion.html
[20:04] <fsphil> love that it's so clear they orbit a point somewhere between
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[20:20] <Lunar_Lander> soo
[20:20] <Lunar_Lander> TV appearance worked well
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[20:29] Nick change: davo -> Guest69236
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[21:00] <harvy> Hey guys, We are trying to calculate parachute size and it seems we have to take into account remenants of the balloon?
[21:01] <harvy> Is there a rough idea of what the would be?
[21:01] <harvy> Or girls*
[21:03] <fsphil> just add the weight of your balloon to your calcs
[21:03] <harvy> Won't most of it blow away?
[21:04] <daveake> varies
[21:04] <daveake> I've seen them come down with nothing but the neck left, or as much as 2/3rds of the original weight of latex
[21:05] <harvy> So when calculating, do we always go for worst case?
[21:06] <Lunar_Lander> yes because that will be the highest speed
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[21:08] <harvy> If we did add the whole balloon weight on, so in our case 1200g. What's the acceptable decent rate?
[21:10] <Lunar_Lander> 5 m/s I'd say
[21:11] <Lunar_Lander> won't want to come in too quick
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[21:11] <harvy> So 5m/s for thw whole balloon and payload?
[21:11] <harvy> the*
[21:12] <Lunar_Lander> yea the system
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[21:38] <Laurenceb__> B-63 passed "1 month"
[21:38] <Laurenceb__> a year/12
[21:38] <arko> wow
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[21:39] <Lunar_Lander> :)
[21:39] <Lunar_Lander> awesome
[21:39] <mattbrejza> when was the last time we had a normal up/down flight
[21:39] <Lunar_Lander> :P
[21:39] <mattbrejza> some weekends this year have had non-stop rtty
[21:39] <mattbrejza> its been a while
[21:39] <arko> haha
[21:40] <Lunar_Lander> craag told me that there might be one at electromagnetic field at aug. 27
[21:40] <mattbrejza> if anyone has a tracker they dont want lying around
[21:40] Action: Lunar_Lander me
[21:40] <Lunar_Lander> xD
[21:40] <Lunar_Lander> stormdrifter II needs a test spin
[21:40] <Lunar_Lander> maybe
[21:41] <mattbrejza> well you could mail it to us and we'll be happy to dump it in the sea for you :P
[21:41] <Lunar_Lander> xD
[21:41] <Lunar_Lander> btw I had a first
[21:41] <Lunar_Lander> I was on cable TV today :P
[21:41] <mattbrejza> gotta recording
[21:41] <mattbrejza> ?
[21:41] <Lunar_Lander> unfortunately not as I only could watch on livestream
[21:41] <Lunar_Lander> hope they put it on youtube
[21:42] <mattbrejza> o well
[21:42] <Lunar_Lander> I was one of three judges in a science challenge
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[21:42] <mattbrejza> ah right
[21:42] <Lunar_Lander> two people performed experiments and we had to decide who did the better one and who explained it better
[21:42] <Lunar_Lander> so we were on a google hangout and then we could talk to the studio
[21:42] <Lunar_Lander> the one guy did a bridge out of zig-zag folded paper
[21:43] <Lunar_Lander> the other one connected a limp balloon to an inflated one and showed that the big one doesn't inflate the small one
[21:43] <Lunar_Lander> that guy won 2:1
[21:43] <Lunar_Lander> xD
[21:43] <mattbrejza> i thought it was ballooning relatedd (you on tv)
[21:43] <mattbrejza> looks like habs open doors or something... :P
[21:43] <Lunar_Lander> ah that is planned
[21:43] <Lunar_Lander> :)
[21:43] <Lunar_Lander> yea
[21:44] <Lunar_Lander> they want me in the studio some day and then I'll show the famous straw above the world pictures xD
[21:44] <mattbrejza> oh yes i remember the straw
[21:44] <mattbrejza> got a bit wet?
[21:44] <Lunar_Lander> yea the river splashdown
[21:45] <daveake> well aimed
[21:45] <Lunar_Lander> :)
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[22:11] <mfa298> mattbrejza: https://www.dropbox.com/s/fatqbkxe3pmqfbd/2014-08-07%2023.08.55.jpg
[22:12] <mfa298> It's not perfect and also seems to be having some issues uploading to habitat but decodes on a Pi :)
[22:12] <mattbrejza> :)
[22:12] <mattbrejza> (and before someone asks, no it cant connect to a dongle ;)
[22:13] <mfa298> that looks to be around 50% CPU using oracle java 7
[22:13] <mattbrejza> also if youre basing 'issues uploading to habitat' from the console output, the console output cna be misleading
[22:13] <mattbrejza> that isnt too bad, i wonder how much is that waterfall
[22:14] <mfa298> there's a lot of console output. The top window also seems to be showing some sentences twice.
[22:14] <mattbrejza> yea tahts a feature ;)
[22:14] <mattbrejza> there are two ways to look for packets, one using the standard rs232 start-stop bit thing,
[22:15] <mattbrejza> and one looks for the bit sequence $$ and then counts bits
[22:15] <mfa298> now we need a 50 baud flight so I can try with a not so strong signal seeing as this has the tx and rx very close together.
[22:15] <mattbrejza> well it should work just as well
[22:16] <mfa298> next one will be to test out rtl_fm and see if that can decode SSB
[22:16] <mfa298> I did try it before with a live flight and the Pi version failed miserably but that was a different Pi and I'm not sure what form of java it was running.
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[22:20] <mattbrejza> http://users.ecs.soton.ac.uk/mfb2g09/decoder/ try the new version
[22:20] <mattbrejza> see what the cpu difference is mfa298 ^
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[22:21] <mfa298> that one was running decoder2.jar, I should probably try the others to see if there's a difference but I'm guessing not much
[22:22] <mattbrejza> well i just deleted the other ones :P
[22:22] <mattbrejza> they have very subtle changes that wont be performance related
[22:22] <mattbrejza> anyway, there is a no waterfall version now
[22:23] <mfa298> just trying it
[22:24] <mfa298> looks to be a bit lower
[22:25] <mattbrejza> it still does the fft (needed for AFC), but it doesnt render and display an image
[22:25] <mattbrejza> so looks like most of it is in the dsp
[22:26] <mattbrejza> although 50% CPU isnt bad when fldigi wont even run
[22:26] <mfa298> the waterfall version mostly looked to be 40-50% cpu in userspace, this one looks to be 30-40%
[22:26] <mfa298> although some peaks at 90%
[22:26] <mattbrejza> 20% reduction then
[22:26] <mfa298> but without more detailed looking it's hard to know what that is.
[22:26] <mattbrejza> still spiking?
[22:26] <mattbrejza> with nowf?
[22:27] <mfa298> if rtl_fm can do SSB it might be possible to do the whole lot on the Pi
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[22:27] <mfa298> still getting the spikes with nowf but it's possible it's something else causing it.
[22:27] <mfa298> or could be something like the habitat uploads
[22:27] <mattbrejza> thing is, doesnt even need SSB, just needs complex signal at BB
[22:27] <mattbrejza> habitat uploads shouldnt cause it really
[22:28] <mattbrejza> i could understand if you had turbohab running though
[22:28] <mfa298> for the last minute or so the peaks are around 70% so still acceptable.
[22:29] <mfa298> and could still be something completly different. I'm just looking at the output of vmstat
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[22:29] <mattbrejza> i wonder how much overhead the jvm acutally causes
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[22:29] <mattbrejza> if it JIT compiles, it might be very low
[22:30] <joeman> motninh
[22:30] <joeman> morning
[22:32] <mfa298> darn, I need a B+ so I can plug in the keyboard +mouse (one wireless dongle), soundcard and rtlsdr so I could try running rtl_fm and the java decoder together
[22:32] <mattbrejza> lol, who would have thought you would need more than 2 usb devices
[22:34] <mfa298> I could always cheat and grab a USB hub
[22:34] Action: mfa298 wonders if the Pi will cope with unplugging the keyboard dongle and plugging in an rtlsdr without rebooting...
[22:34] <mattbrejza> however quick farnell are, looking for the hub is probably quicker
[22:34] <fsphil> mfa298: I did just that on a B+
[22:35] <fsphil> and it survived
[22:35] <mattbrejza> although i have bought more stuff from farnell rather than looking for stuff hidden away
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[22:36] <mfa298> If I had a B+ I wouldn't need to try hot plugging
[22:36] <amell> just plug the rtlsdr into the keyboard.
[22:37] <mfa298> well I managed to unplug the keyboard. but plugging in the rtlsdr caused a reboot
[22:37] <amell> oh, not using an apple USB keyboard? never mind.
[22:37] <fsphil> apple keyboards are ugly things
[22:37] <mfa298> I think a keyboard with USB ports on it would fall under the 23:34 < mfa298> I could always cheat and grab a USB hub
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[22:39] <amell> erm excuse me, apple keyboards are a work of art.
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[22:40] <mfa298> hah, Who needs a keyboard and mouse, ssh pi@raspberrypi; startx &; export DISPLAY=:0; java -jar decoder_nowf.jar
[22:40] <mfa298> ...
[22:40] <mfa298> profit
[22:41] <fsphil> apt-get install x11vnc
[22:43] <mfa298> that would be too easy
[22:44] <mfa298> I was surprised I could run startx from an ssh session. The rest I knew would work.
[22:44] <mattbrejza> wait, rpi doesnt allow hotplugging :/
[22:46] <mfa298> usb on the original A & B is a bit iffy.
[22:47] <mfa298> some stuff is ok, but some things cause a reboot
[22:48] <mfa298> at a guess it could be down to power usage and inrush current
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[22:56] <mfa298> ooo options have changed in latest rtl_fm so it's code might have improved
[22:56] <mfa298> [-M modulation (default: fm)]
[22:56] <mfa298> fm, wbfm, raw, am, usb, lsb
[22:56] <mfa298> wbfm == -M fm -s 170k -o 4 -A fast -r 32k -l 0 -E deemp
[22:56] <mfa298> raw mode outputs 2x16 bit IQ pairs
[22:56] <mfa298> -M usb -f 434.650 is sounding promising :)
[22:56] <myier> speaking of which, I asked the guy if he was willing to help port it to another device (fcdp+ in particular) and he never replied
[22:56] Action: mfa298 can hear rtty
[22:57] <myier> hello by the way
[22:59] <Dark-Fx> heya
[23:03] <mfa298> yay kernel panic
[23:03] <mfa298> however before that java decoder and rtl_fm running and some spare cpu cycles
[23:04] <fsphil> nice!
[23:04] <mfa298> final trick will be getting data direct from rtl_fm to the java decoder
[23:04] <fsphil> and writing the decoder in C :)
[23:04] <fsphil> though that may not improve much. I've often heard from java fans about its low overhead
[23:07] <mfa298> when did it get past midnight. I'm sure it was only 23:15 a few minutes ago....
[23:08] <mattbrejza> ill leave it up to Bo to add rtl support to the decoder....
[23:08] <mattbrejza> now we know its possible for it all to run ;)
[23:13] <arko> mattbrejza: will we get parts with the pcb for the badge? if not is there a buy in on part?
[23:15] <mattbrejza> ask Upu :P
[23:15] <mattbrejza> pcbs need a minor bodge anyway
[23:17] <mfa298> I'm now seeing if I can persaude the Pi to send audio via a cable so it can decode what's it's rxing
[23:21] <Lunar_Lander> good night
[23:21] <fsphil> nite ll
[23:22] <myier> what are you decoding with mfa298?
[23:24] <MarkIreland> mfa298: got this going on the pi the other day
[23:24] <MarkIreland> only got so far
[23:24] <MarkIreland> installed dl-fldigi on there too
[23:24] <MarkIreland> lol
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[23:24] <MarkIreland> but got my dongle recieving and outputting via pi's audio
[23:25] <myier> with rtl_fm?
[23:25] <MarkIreland> yeah
[23:25] <myier> that'd be nice to have it for the fcdp+, I don't find a low power alternative
[23:25] <mfa298> rtl_fm to convert the RF into audio and then matt's java app to decode the rtty
[23:26] <MarkIreland> ah whats this java app?
[23:26] <myier> java shouldn't be much better than fldigi I guess
[23:26] <myier> (in term of resources)
[23:26] <mfa298> going via an audio cable into a usb sound card
[23:26] <myier> why don't you use jack, the virtual audio cable?
[23:26] <MarkIreland> I was wondering whether pi could do everything?!
[23:27] <mfa298> last time I tried dl-fldigi it was no near being able to run on the Pi it needed a lot more CPU than the Pi had
[23:27] <mfa298> and that looks like it's decoding
[23:27] <myier> I'm not even able to run it on a 2.8GHz pentium D
[23:27] <MarkIreland> I had it running but yeah didnt get as far as trying to see if it works
[23:27] <mfa298> rtl_fm -M usb -f 434.649m | aplay -r 24k -f S16_LE -t raw -c 1
[23:27] <MarkIreland> yeah so what next - pipe this into the java app?
[23:27] <MarkIreland> is that what its for?
[23:28] <mfa298> java app is in http://users.ecs.soton.ac.uk/mfb2g09/decoder/
[23:28] <MarkIreland> whats it do?
[23:28] <mfa298> either decoder.jar or decoder_nowf.jar
[23:29] <mfa298> it's the standalone version of matt's android app
[23:29] <MarkIreland> ah so no need for dl fldigi
[23:29] <mfa298> screen photo from earlier https://www.dropbox.com/s/fatqbkxe3pmqfbd/2014-08-07%2023.08.55.jpg
[23:30] <myier> is it open source?
[23:30] <MarkIreland> ah awesome
[23:30] <MarkIreland> there we go then
[23:30] <MarkIreland> defo possible to have a total pi reciever with dongle
[23:30] <myier> it's incredible that the pi can be able to do all that
[23:31] <MarkIreland> I'll have another look at this over the weekend
[23:31] <mfa298> it's not getting perfect decodes like this but it's a decent start for something could work in a useful way
[23:31] <MarkIreland> would be nice for the car so you dont need laptop, maybe wire on some kind of tuner knob
[23:31] <mattbrejza> but is that because is skipping cycles and so the pi is to blame, or is your timing a bit off or something lik ethat?
[23:32] <mfa298> I shall have to try and write this up at some point.
[23:32] <mattbrejza> that was the idea behind the andorid app
[23:32] <mattbrejza> because tablets have screens, pis do not
[23:32] <MarkIreland> yeah but I dont have a radio, only a dongle
[23:32] <mfa298> could well be timing on the transmitter - it's my Pi based thing so bit banging 50 baud rtty.
[23:33] <mattbrejza> yea dongles are annoying
[23:33] <MarkIreland> yes they are!
[23:33] <mfa298> I could tune the rtl-sdr down a bit and get DominoEX but no decoder for that yet
[23:33] <MarkIreland> But didnt want to pay for radio at the moment
[23:33] <mattbrejza> perhaps LoRa will make car chasing easier
[23:33] <MarkIreland> LoRa?
[23:33] <mfa298> The Pi still looks to have a decent amount of CPU available
[23:33] <mattbrejza> a properitary modem IC
[23:34] <MarkIreland> ah ok
[23:34] <mattbrejza> but i reckon it should perform pretty well
[23:34] Action: mfa298 tries bumping the baud up to 300
[23:35] <MarkIreland> could do with the pi being command line based rather than the need for the desktop and the app
[23:35] <MarkIreland> need a command line decoder lol
[23:35] <MarkIreland> that auto found and fixed on freq
[23:36] <MarkIreland> so you dont need a pi screen
[23:36] <mfa298> getting partials at 300 baud but that is using all cpu on the Pi
[23:36] <MarkIreland> overclocked?
[23:37] <mfa298> not overclocked
[23:37] <MarkIreland> easy overclock using built in menu
[23:38] <mattbrejza> mfa298: yea some parts will run 6x more often at 300
[23:38] <mattbrejza> but changing stuff like filter lengths will help a great deal
[23:39] <mattbrejza> its at like 64 atm which is a bit ott, 24 woiuld probably be fine
[23:41] <mfa298> thats also the waterfall version
[23:41] <mfa298> so nowf might help a bit
[23:42] <mfa298> still thats some decent progress for an evening
[23:42] <mattbrejza> right bed, laters
[23:42] <mfa298> especially as I didn't get home to >10
[23:42] <mattbrejza> thanks for playing about with stuff
[23:43] <mfa298> this may mean we end up having to help Bo make it work now ...
[23:43] <mattbrejza> damn
[23:44] <joeman> hi
[23:44] <joeman> how long does it take for UK people to get authorisation to fly a balloon?
[23:44] <myier> do you need one?
[23:44] <joeman> no
[23:44] <joeman> I'm in Australia
[23:44] <joeman> just trying to see how it compares
[23:44] <joeman> (timewise)
[23:45] <myier> I'm in France, we don't need an authorization
[23:45] <joeman> even for say a 1.5kg payload?
[23:45] <myier> up to 4kg
[23:45] <joeman> wow
[23:45] <joeman> that is absolutely amazing
[23:45] <myier> or 4 balloons, I don't remember exactly
[23:46] <joeman> mmm I was born in the wrong country
[23:46] <joeman> *g*
[23:46] <myier> I didn't now that was different anywhere
[23:46] <myier> +k
[23:46] <joeman> Someone over here took 6 weeks...that was right down the wire
[23:46] <joeman> for a 1.5kg paylaod
[23:46] <myier> wow
[23:47] <joeman> out in the midle of absolutely no where
[23:47] <joeman> (literally)
[23:47] <myier> what kind of RF band do you have access to without a license?
[23:47] <joeman> 900MHz I think
[23:47] <joeman> and a few others
[23:47] <joeman> I think you even need a HAM licence
[23:48] <joeman> not sure to be honest
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[23:48] <myier> there should be some ISM bands, license-free
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[00:00] --- Fri Aug 8 2014