highaltitude.log.20140421

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[05:55] <Reb-SM3ULC> morrn
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[07:20] <Babs____> Morning sports fans
[07:21] <eroomde> too morning
[07:21] <Babs____> Did you have an epic chocolate day eroomde?
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[07:26] <eroomde> Babs____: i had a small bit o chocolate
[07:26] <eroomde> my ester egg was actualli a chilli plant
[07:27] <eroomde> you?
[07:27] <Babs____> I had a more conventional Easter egg
[07:30] <eroomde> i might have one today
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[07:31] <Babs____> Easter HAB upside: my deconstructed Spot back up tracker works perfectly in its new home http://flic.kr/p/nh4fpp
[07:31] <eroomde> very smart!
[07:32] <Babs____> Easter HAB downside - it may not work as a conventional distress beacon again
[07:32] <eroomde> is this passively stabilised?
[07:32] <Babs____> Yes, this one just point upwards in case I land without a signal in Iowa somewhere (having driven across Iowa I can confirm there is not much of a signal anywhere)
[07:33] <Babs____> The really funky active stuff is below it
[07:33] <eroomde> nice
[07:33] <eroomde> v impressive stuff
[07:34] <Babs____> Here is one I didn't design earlier http://flic.kr/p/nadUXD
[07:34] <Babs____> It's all
[07:34] <Babs____> coming together quite well now
[07:34] <Babs____> But is a bit of a slow burner project
[07:36] <eroomde> well, you've got stuff to keep you busy
[07:37] <Babs____> Too right. I have been running around doing all of the odd jobs I have been putting off for months this weekend before It arrives
[07:37] <Babs____> How is your business going?
[07:39] <eroomde> hardware is arriving apace for the next thing
[07:40] <eroomde> which is all exciting
[07:40] <eroomde> there's just a scary amount to do, all-in-all, though
[07:41] <Babs____> How far away is the first non ground test ?
[07:41] <eroomde> oh gosh, fairly far
[07:41] <Babs____> Like 1 year or 8?
[07:41] <eroomde> mopunt everest atm would be a full demonstration sabre engine, on the ground
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[07:42] <Babs____> I will race you with stabilotron II
[07:42] <eroomde> probably nearer 8 - it would be like designing an airliner before you've injvented the jet engine
[07:42] <Babs____> Ok
[07:43] <eroomde> we need to get a working sabre on the ground to demonstrate fully that it works
[07:43] <Babs____> It's a cool life project to work on
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[07:43] <Babs____> I was chatting to The Wife about Carolyn Porco, and how she has basically done 2 projects
[07:43] <Babs____> In her life
[07:43] <Babs____> But they are very cool projects
[07:44] <Babs____> Much better than 55 pie factory or cake factory transactions
[07:45] <eroomde> yeah, experimental planetrary science especially
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[07:45] <eroomde> it's kinda 20 years between a mission being mooted over a drink to hardware in orbit around saturn
[07:46] <eroomde> 9 of which is just cruising there
[07:46] <Babs____> Exactly
[07:46] <eroomde> and that's an academic career
[07:46] <Babs____> Well, doing a few funky slingshots on the way
[07:47] <eroomde> indeed
[07:47] <eroomde> rosetta was pretty amazing
[07:47] <eroomde> not sure if you saw any of the animations
[07:47] <Babs____> Yes, it's definitely the best way to learn Cantonese
[07:47] <Babs____> Oh
[07:47] <eroomde> https://www.youtube.com/watch?v=iEQuE5N3rwQ
[07:47] <Babs____> Arf
[07:48] <Babs____> Have you got a Chromecast ? You can receive links like that and fling it to the tv
[07:49] <Babs____> It's like minority report without a half naked samantha Morton
[07:50] <eroomde> i don't have one but i do know of it
[07:50] <eroomde> might get one
[07:52] <Babs____> I have to say, I got bored of it pretty quickly
[07:52] <Babs____> That animation is cool
[07:52] <Babs____> It's really shifting at the end
[07:53] <eroomde> yeah
[07:53] <eroomde> i can just imagine the sales pitch describing the slingshots
[07:53] <eroomde> 'hear me out guys....'
[07:54] <Babs____> Presumably our years are ever so slightly longer due to all of these interplanetary craft
[07:54] <Babs____> The Carpenters never talked about that one did they ?
[07:55] <Babs____> 10 bonus points for anyone who gets the reference
[07:55] <eroomde> oh from conservation of angular momentum?
[07:55] <Babs____> Yes
[07:55] <eroomde> i suspect the annual meteorite fall has a decent tonnage
[07:55] <Babs____> Ooo. Good call.
[07:55] <Babs____> Sun irradiating mass too.
[07:56] <Babs____> I've no doubt none of those words actually go together, but you know where I am coming from
[07:56] <Babs____> Well, light has mass etc
[07:57] <daveake_> Babs____, Are you about to sing a recitation?
[07:57] <Babs____> Daveake - I knew I could rely on you
[07:57] <Babs____> Are you planning a launch this year?
[08:00] <eroomde> Babs____: have you been to Franco Manca for pizza?
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[08:00] <eroomde> there are a few in london now
[08:00] <Babs____> No
[08:00] <Babs____> I heart pizza
[08:01] <eroomde> it's worth a visit
[08:01] <eroomde> i'm hoping to go this eve
[08:01] <Babs____> Where I live bans any retail establishments with over 4 stores
[08:01] <Babs____> It's like living in 1980s Eastern Europe
[08:01] <eroomde> golly
[08:01] <Babs____> Which one are you going too?
[08:02] <Babs____> Although they are apparently ok with having a whole foods
[08:02] <eroomde> chiswick i think
[08:02] <Babs____> So 'no chains unless they are organic' then
[08:02] <Babs____> Chiswick is nice
[08:02] <eroomde> have a friend with a company there who i periodically catch up with at FM
[08:03] <Babs____> I would also tip made in Italy's roof terrace on the kings road
[08:03] <Babs____> Pizza by the metre , just like it should be
[08:03] <eroomde> nice
[08:04] <Babs____> I have a great pizza picture somewhere. Let me scan.
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[08:07] <Babs____> No. Can't find it. The pizza was massive but i had no immediately available reference length for a photo, so I used my head
[08:07] <eroomde> nice
[08:08] <eroomde> i am more sure than ever that pizza is the right thing to do this evening
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[08:13] <Babs____> Here you go eroomde http://flic.kr/p/nf5qAK
[08:15] <eroomde> blimey!
[08:16] <eroomde> where was this?
[08:17] <Babs____> Bloomsbury Bowling Lanes I think
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[08:18] <eroomde> nice
[08:18] <eroomde> i haven't been bowling for ages
[08:18] <eroomde> there is a bowling nearby
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[08:19] <eroomde> one of those alien cark-park things that have bowling, cineworld, frankie+bennies that settle into orbit around towns and cities
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[08:29] <Babs____> Moving on from pizza - eroomde , is there any way to easily config a circuit for two way control of a brushless motor ?
[08:31] <eroomde> you'd need the right controller pcb
[08:32] <eroomde> it's easy enough to make one, but 'm not sure about modifying something existing
[08:32] <Babs____> That's where i got too
[08:32] <eroomde> you might actually be able to swap two of the wires around with a dpdt relay if you had to mod something existing
[08:32] <eroomde> so the phases go from pulsing 1-2-3-1-2-3 to 1-3-2-1-3-2
[08:32] <Babs____> My two contra rotating wheels work ok
[08:32] <eroomde> it slight depends on how the controller gets feedback from the motor
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[08:33] <Babs____> But it is an ineffient way to do it
[08:35] <eroomde> yep, better would be a decent bidirectional controller
[08:35] <eroomde> wouldn't the controllers you use for the camera gimbal do the job?
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[08:41] <Babs____> Yes, I think so but they are a bit expensive and seem like overkill a little for it
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[10:39] <Jededu> What sort of range (reception) should I expect to get from a SDR Dongle Hab amp and Watson w300
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[10:43] Nick change: Geoff-G8DHE_ -> Geoff-G8DHE-M
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[10:49] <SA6BSS> Jededu: antenna hight and how your surrounding looks like is the most importent, with a sdr dongle and a habamp, and your antenna at descent height you would probably recive all the way to 0 deg (blue circle edge)
[10:53] <SA6BSS> any tall building or hill or even large trees in a specific direction will decrese reception i that direction
[10:55] <Jededu> I am at one of the highest points in birmingham the antenna is above all the surrounding roofs by about 3 mtrs from the chimney i cannot see any visible obstacles yet I struggled to track B-46 past Stoke
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[11:02] <eroomde> because birmingham
[11:03] <Jededu> Birmingham what
[11:04] <eroomde> that was it
[11:04] <Jededu> Ahh
[11:04] <eroomde> i imagine the noise floor and specular scattering might be quite high in the middle of a city
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[11:04] <eroomde> a yagi might make all the difference
[11:04] <eroomde> anyway drinks oclock bbl
[11:05] <Jededu> Yes I was looking at yagi
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[11:27] <eroomde> fsphil: got a nesting collar-dove: https://www.dropbox.com/s/pqcu94nqq0bztlu/2014-04-21%2012.25.45.jpg
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[11:32] <SA6BSS> What you think about b46 time to swing around greenland and back, 60-72 hours?? wednesday evening?
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[11:34] Nick change: Geoff-G8DHE_ -> Geoff-G8DHE-M
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[11:48] <fsphil> eroomde: that's an unusual spot
[11:48] <eroomde> yeah
[11:48] <eroomde> she seems quite unbothered
[11:48] <eroomde> despite things like woodpeckers helping themslves to the feeders
[11:49] <fsphil> our nesting BTs spend all day chasing other birds from the garden
[11:50] <DL7AD> ist jemand hier dessen muttersprache deutsch ist?
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[12:39] <Kodar> Hello
[12:39] <Kodar> http://aprs.fi/#!call=a%2F9A14SB-11&timerange=3600&tail=3600
[12:40] <Kodar> 9A14SB with APRS on 144.800
[12:40] <Laurenceb> i wonder if B-46 survived
[12:40] <Laurenceb> i didnt see rain at that time on the forecast
[12:41] <Laurenceb> if it was ice it might have melted at dawn
[12:41] <Darkside> Kodar: oh its in th air now?
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[12:50] <x-f> have a great flight, Croatia!
[12:51] <Kodar> yes, flying ..
[12:51] <Kodar> heh, I find it on aprs map ! :)
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[12:52] <Kodar> tracking "9A1CBV" and find it.. ;)
[12:52] <Darkside> Kodar: http://spacenear.us/tracker/?filter=+9A14SB-11
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[13:05] <Kodar> ahh
[13:06] <Kodar> 432.600 +-
[13:06] <Kodar> totaly unstable TX
[13:06] <Kodar> :(
[13:07] <Darkside> ?
[13:07] <Darkside> whats this?
[13:07] <Darkside> haha
[13:07] <Darkside> oh thats the cutdown
[13:07] <Darkside> Kodar: the cutdown doesnt have position on it
[13:08] <Kodar> $$OSIRIS01,474,-14,2832,-91,0,0,No uplink received yet,515*BF1D
[13:08] <Darkside> i think they're just using it as a timed cutdown unit at th moment
[13:08] <Darkside> yup
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[13:09] <Darkside> hrm their noise floor is a bit high, i wonder what they did..
[13:10] <Kodar> $$OSIRIS01,480,-15,2822,-90,0,0,No uplink received yet,401*F37B
[13:10] <Kodar> no idea
[13:10] <Darkside> yup
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[13:11] <Darkside> Kodar: kep watching that
[13:11] <Darkside> i'll be interested to know what happens whn the counter hits 0
[13:11] <Darkside> assuming they used the right batteries, that should fire and cutdown
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[13:12] <Kodar> $$OSIRIS01,488,-16,2800,-91,0,0,No uplink received yet,244*3616
[13:12] <Darkside> woo
[13:13] <Kodar> $$OSIRIS01,489,-16,2796,-91,0,0,No uplink received yet,225*427C
[13:13] <Darkside> yeah you dont need to paste them all in here
[13:13] <Kodar> and drifting down fast ..
[13:13] <Darkside> yeah its going to drift a lot
[13:13] <Darkside> they might not have insulated it vry well
[13:14] <Kodar> heh, cant receive all with good crc
[13:15] <Darkside> so when that counter hits zero, you should hear it emit a constant tone, then assuming all went well, it'll report what the battery voltage sagged to when the cutdown fired
[13:16] <Darkside> should be happening any second now..
[13:16] <Darkside> it'll happn right after a downlink packet
[13:17] <Kodar> SIRIS01,500,-16,2790,-93,0|x~opx~p{~~~~yn~__og CUTDOWN TIMER ZERO - FIRING CUTDOWN||}xvropped to 748
[13:17] <Darkside> yep
[13:17] <Darkside> awesome
[13:17] <Darkside> the cutdown fired
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[13:18] <Darkside> and given that voltage, ther was definirtely a bit of nichrome wire attached
[13:18] Nick change: pb1dft_ -> pb1dft
[13:18] <Darkside> so now, assuming the payload was configured correctly, that payload should be falling
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[13:20] <Kodar> IF
[13:20] <Kodar> :)
[13:20] <Kodar> $$OSIRIS01,507,-16,2822,-91,0,0,No uplink received yet,0*98D0
[13:21] <Darkside> well the cutdown fired
[13:21] <Darkside> but its still going up
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[13:28] <Kodar> so, no FIRE ;)
[13:29] <Kodar> what is the "burst" on the end of rtty ?
[13:29] <Darkside> its a 500 baud GMSK burst
[13:29] <Darkside> intended to be received by a ground station using a similar radio
[13:29] <Darkside> never ended up using it though
[13:29] <Darkside> Kodar: ar you the one uploading the met bureau sonde onto APRS?
[13:33] <Kodar> yes
[13:33] <Kodar> stopped now
[13:33] <Kodar> https://www.dropbox.com/sh/yd0crgzq4sn4igz/Vv9jnZgy8I/UHF/9A_sonde
[13:34] <Darkside> yup
[13:34] <Darkside> thats it allright
[13:34] <Darkside> well the payload itself is doing all its meant to be doing
[13:35] <Darkside> can't same the same about whatever else is attached to it
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[13:39] <Lunar_Lander> hello
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[13:55] <Kodar> hah
[13:55] <Kodar> rtty gone
[13:56] <Darkside> interesting
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[13:57] <Darkside> burst
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[16:18] <aadamson> hmm... so if anyone is curious... I've updated my solar/Lipo notes
[16:18] <aadamson> http://www.evernote.com/shard/s159/sh/548e7d5a-e732-4f81-8b79-efa8fd29788a/798138280401a683a5c258d9d77b04c2
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[16:19] <aadamson> bottom line, no load on the spv1040/LIPO output, just letting the PV controller charge the battery
[16:19] <aadamson> with a AAA battery as the PV source, you get .120a of current going *into* the battery
[16:19] <aadamson> now put 2 1x3 inch solar cell, wired in parallel on the controller, same test as above
[16:20] <aadamson> and you get .022a of current back into the battery
[16:20] <aadamson> which means, load needs to be less that .22a or else you will never charge the battery... to state the obvious
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[16:45] <mikestir> aadamson: are you using an stlink v2 to program your board?
[16:52] <aadamson> usually I do, but I got a segger jlink-edu and am liking that lots better, it was more $$$, but it's probably 4 times as fast as well
[16:52] <mikestir> is it ok with the board at low voltage?
[16:52] <aadamson> and in the grand scheme of things, it really wasn't all that much more
[16:53] <aadamson> yes, as long as you hook up the VDD detect it should work down to low powered boards
[16:53] <mikestir> ok. I'm planning on using one to program my kinetis based tracker
[16:53] <mikestir> because openocd doesn't care that it's not an st processor
[16:54] <aadamson> I've used openocd as well, the latest version has support for the free-scales and also the latest eclipse plugin does as well believe
[16:54] <aadamson> http://www.segger.com/general-info.html?p=984
[16:54] <aadamson> jlink info
[16:54] <aadamson> it supports everything as well
[16:54] <aadamson> and does 1.2-3.3v
[16:55] <mikestir> yeah I was looking at that as well. You can get a chinese copy for a tenner
[16:55] <mikestir> but I already have the stlink
[16:55] <aadamson> yes be very careful however, as the clones are known to have issues
[16:55] <mikestir> yeah like I bet they leave out the level shifter
[16:55] <aadamson> I just decided that I didn't want to deal with it, so I bought an original
[16:56] <mikestir> well I'm just finishing the layout on this board, so we'll see how it goes in a couple of weeks
[16:56] <mikestir> it's pretty small
[17:05] <jiffe98> anyone ever use only solar cells and a cap in a payload?
[17:07] <eroomde> yes
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[17:08] <jiffe98> work out pretty well? I had looked at a few of them but they didn't seem to work well in cold temps
[17:09] <eroomde> it was jcoxon, not i
[17:09] <eroomde> he used a supercap
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[17:14] <Upu> you could run a solar only payload
[17:15] <Upu> A supercap wouldn't keep it going over night
[17:15] <Upu> you might as well use a LiPo as they will keep it going over night
[17:16] <eroomde> though for the really long duration stuff, just checking in 3-4 times a day is probably enough
[17:17] <jiffe98> I'm not too interested in overnight yet just need a couple hours I think
[17:17] <eroomde> ah
[17:18] <eroomde> well you don't need solar at all then really :)
[17:18] <eroomde> only really makes sense for 2+ days i reckon, or 2+ weeks on a non-pico
[17:18] <arko> new beta noaa site: http://origin-www.swpc.noaa.gov/
[17:18] <jiffe98> I'm seeing solar cells that put out up to 40ma and weight 4.5 grams though
[17:19] <Upu> uh ?
[17:19] <Upu> heavy
[17:19] Action: Upu high fives zeusbot
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[17:20] <saadzmirza> Anyone watching ITLAC02?
[17:20] <eroomde> i think the current they put out probably depends on the load :)
[17:20] <jiffe98> Upu: heavy in comparison to a battery? maybe I'm using the wrong batteries
[17:20] <jiffe98> yeah I haven't tested any of these out
[17:20] <saadzmirza> And Hello!
[17:20] <Upu> possibly are you using Energizer Lithiums ?
[17:20] <Upu> ITLAC02 ?
[17:20] <Upu> oh boy this should be fun
[17:21] <Upu> got a link ?
[17:21] <saadzmirza> one sec
[17:21] <saadzmirza> turned off after 48km
[17:21] <saadzmirza> http://www.twitch.tv/sateliteitlacmx
[17:22] <Upu> turned off after 48km
[17:22] <Upu> ?
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[17:22] <saadzmirza> I was watching, but apparantly it has gone to a blank screen.
[17:22] <Upu> so they thinky they've gone over 48km ?
[17:22] <saadzmirza> That's thak they want everyone to believe.
[17:23] <Upu> really ?
[17:23] <saadzmirza> Not sure if this is spoofed or not.
[17:23] <Upu> wow
[17:23] <jiffe98> energizer lithium aaa's weight 7.6 grams and I would need 4 to get up to 6v at peak
[17:23] <saadzmirza> I'm sure they'll claim something stupid like 54KM in a day or too.
[17:23] <saadzmirza> *two
[17:24] <saadzmirza> I take it back, I meant 46KM.
[17:24] <Upu> why do you need 6V jiffe98 ?
[17:25] <saadzmirza> Last time, they claimed to hit 47.4KM, but there was a lot of fishiness.
[17:25] <Upu> they didn't get that
[17:25] <Upu> and they didn't get 46km this time
[17:26] <saadzmirza> Yeah, probably not.
[17:26] <saadzmirza> I have a screenshot of their live cam at 45KM on my phone, if anyone wants to see it.
[17:26] <Upu> yes pls
[17:27] <saadzmirza> I hope they don't win the GSBC on spoofed data.
[17:27] <Upu> well they better be able to prove it if they do
[17:27] <saadzmirza> Another team hit 40KM, but I believe that.
[17:27] <Upu> we warned them
[17:27] <Upu> well that was SP9UOB from here
[17:27] <Upu> and there were multiple recievers on that one
[17:28] <jiffe98> Upu: the aprs ic I'm using has a min voltage of 6v in its input
[17:28] <Upu> use another one ?
[17:28] <Upu> you can get APRS out of an SI chip @ 1.8V
[17:29] <jiffe98> yeah, taking things one step at a time
[17:31] <LeoBodnar> APRS IC?
[17:31] <Upu> got the screen shot saadzmirza
[17:31] <Upu> ?
[17:33] <jiffe98> LeoBodnar: https://www.argentdata.com/support/tracker3_manual.pdf we're using the mini
[17:34] <saadzmirza> one min
[17:35] <Upu> ah so not a pico payload then :)
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[17:37] <daveake_> If ITLAC02 has data to prove 46km, I'm an enchilada
[17:37] <saadzmirza> How punny.
[17:38] <saadzmirza> @daveake_
[17:38] <saadzmirza> daveake_
[17:38] <saadzmirza> How do you address someone?
[17:38] <daveake_> I got it :)
[17:38] <daveake_> Just mention the nick anywhere in a message
[17:38] <saadzmirza> OK.
[17:39] <myself> some clients only highlight it if the nick appears at the beginning of a line
[17:39] <myself> (mine does this, thankfully)
[17:40] <myself> if you want to speak privately with someone, use /msg nick or /query nick
[17:40] <saadzmirza> I'm using the freenode web client
[17:40] <saadzmirza> How can I post this pic?
[17:40] <daveake_> imgur.com ?
[17:41] <saadzmirza> Uploading right now.
[17:41] <saadzmirza> imgur is great! http://imgur.com/FxAgQcB
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[17:42] <Upu> cool thx
[17:42] <daveake_> when it works
[17:42] <myself> neat
[17:42] <Upu> well lets see what they claim
[17:42] <Upu> and how they claim it
[17:43] <Upu> because I'm still calling bollocks
[17:43] <saadzmirza> Strange thing is timestamp is off.
[17:44] <saadzmirza> I was calculating the ascent rate, it was steady at 5m/sec
[17:45] <saadzmirza> Their last FB post: hola a todos, con la noticia que ya casi tenemos la sonda en las manos, estamos muy felices porque llegamos a una altura de 46,523m Gracias a todos por su apoyo y por sintonizarnos.
[17:45] <LeoBodnar> i would be interested to curve fit ascent and descent to standard atmosphere densities
[17:45] <LeoBodnar> last time i did that it did not fit
[17:45] <saadzmirza> Hi all, with the news that we have almost the probe in the hands, we are very happy because we reached a height of 46,523 m :) Thank you all for your support and for joining us. (Translated by Bing)
[17:46] <LeoBodnar> Bing should have translated altitude too :/
[17:46] <saadzmirza> Close enough.
[17:47] <saadzmirza> I wonder if they used the very vaguely explained valve system.
[17:47] <saadzmirza> Last flight they used a 2000g Kaymont.
[17:48] <saadzmirza> It bugged me that they kept referring to it as a sattelite. It's not orbiting the Earth in any way
[17:48] <daveake_> The altitude plot for the previous flight didn't show any valve action
[17:48] <daveake_> The rate never slowed
[17:48] <saadzmirza> Steady ascent rate?
[17:49] <daveake_> Aside from the cyclic nature of the altitude, yep
[17:49] <saadzmirza> Looks like they had two balloons on this flight!?
[17:49] <saadzmirza> https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-frc1/t1.0-9/1069340_1471887289709755_5435273588546086222_n.jpg
[17:49] <daveake_> And the cyclic nature can be explained by the fact that ardupilot adjusts the reported altitude according to accelerometer data
[17:50] <saadzmirza> So it might be a bit off?
[17:50] <saadzmirza> https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-ash3/t1.0-9/10170834_1471904556374695_8683150068410082044_n.jpg
[17:50] <Upu> interesting
[17:50] <saadzmirza> https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-frc1/t1.0-9/1601179_1471904636374687_295114753387787639_n.jpg
[17:51] <saadzmirza> https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-frc3/t1.0-9/10269642_1471904706374680_2223971824499293213_n.jpg
[17:51] <saadzmirza> https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-prn1/t1.0-9/10271516_1471904873041330_8587847197521240453_n.jpg
[17:51] <saadzmirza> Can anyone here judge the size of a balloon visually?
[17:52] <saadzmirza> If yes, https://scontent-a-fra.xx.fbcdn.net/hphotos-ash3/t1.0-9/10153270_1471905289707955_2936682212142009811_n.jpg
[17:52] <saadzmirza> I see no valve here: https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-frc1/t1.0-9/10177947_1471905376374613_760792155269396344_n.jpg
[17:52] <saadzmirza> Sorry for spamming with links, I'm done
[17:52] <daveake_> Not H2 then
[17:53] <LeoBodnar> Same balloon + H2 + 50g tracker = ?
[17:53] <saadzmirza> Yep, no safety regulator, so probably not H2.
[17:54] <daveake_> saadzmirza A few of us looked into the previous claim. They used a version of ardupilot that defaults to calculating the altitude from a pressure sensor, even if a GPS receiver is fitted. The altitude is then adjusted from accelerometer readings. Also, a very simple atmospheric model is used which is very inaccurate at HAB altitudes.
[17:54] <daveake_> Also not red :)
[17:55] <Upu> we told them this and got no response at all
[17:55] <saadzmirza> I see. I hope GSBC requires GPS altitude data.
[17:55] <daveake_> It does
[17:55] <Upu> where to people post comments on the GSBC i.e how did you know about the other 40km altitude ?
[17:55] <daveake_> ""Include: Altitude data, GPS data (including time and date), Photo(s) of your payload and launch setup, Photo from every 10,000ft (3000m) tagged with GPS data."
[17:55] <SIbot> In real units: 10,000 ft = 3048 m
[17:56] <saadzmirza> SIBot? Nice username!
[17:57] <daveake_> For the first flight I'd have been very happy with a response along the lines of "Oh, sorry, we thought we had actual GPS altitude". This time (assuming it isn't actually GPS data) there's no excuse.
[17:57] <daveake_> And I still maintain that 46km with a standard 2000g latex balloon, helium and a fatburger-inspired payload isn't going anywhere near 46km
[17:58] <daveake_> ^ fix for editing :)
[17:58] <saadzmirza> No flights to support it being remotely possible
[17:58] <daveake_> indeed
[17:58] <daveake_> All 10 highest latex flights were sub 100g payloads
[17:58] <daveake_> and h2
[17:58] <saadzmirza> and Hwoyee 1600
[17:59] <daveake_> and that
[17:59] <daveake_> actually more than 10 now I think
[17:59] <daveake_> IIRC no helium latex flight has managed more than about 41km
[17:59] <LeoBodnar> why didn't they use SPOT? http://www.youtube.com/watch?v=LzfxL-FV_Mk&feature=youtu.be
[17:59] <saadzmirza> How do you get the payload so light anyway? We're looking at 180g at the moment.
[18:00] <Upu> make your own saadzmirza
[18:00] <saadzmirza> ?
[18:00] <saadzmirza> Explain
[18:00] <Upu> design one in some PCB software
[18:00] <Upu> solder it
[18:01] <saadzmirza> And have it custom built?
[18:01] <daveake_> and use a step up with 1 AA cell
[18:01] <Upu> yep
[18:01] <Upu> e.g Leo's http://www.leobodnar.com/balloons/B-12/Pages/3.html
[18:01] <Upu> mine https://dl.dropboxusercontent.com/u/63720513/Images/PAVA9/Scan035.jpg
[18:01] <saadzmirza> Impressive!
[18:02] <saadzmirza> It looks like a sat.
[18:02] <Upu> ibanezmatt13's http://imgur.com/a/p6zpd
[18:02] <Upu> etc etc
[18:02] <ibanezmatt13> oh yea
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[18:02] <Upu> its worth noting these are the size of tracker we used on the altitude attempts
[18:03] <saadzmirza> This'll need some thinking.
[18:03] <saadzmirza> Maybe ours is ungainily large.
[18:06] <saadzmirza> A question: would it be ok to wrap space blanket or 1mil mylar around the outside of the payload?
[18:06] <myself> noo never do that, that's what attracts aliens
[18:06] <saadzmirza> Would it possibly deflect the radio waves from the tracker
[18:06] <saadzmirza> *?
[18:07] <SpeedEvil> 1 mil mylar is probably not obtainable
[18:08] <saadzmirza> I have it.
[18:08] <saadzmirza> I ordered it from Amazon for Marathon to the Sky.
[18:08] <LeoBodnar> define mil
[18:08] <SpeedEvil> I suspect you don't.
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[18:08] <SpeedEvil> Not 2.54um, 1/1000"
[18:09] <bertrik> I think the shape of the antenna is most important for the radio waves, wrapping the payload should not matter much
[18:09] <saadzmirza> Oh, that's not quite a millimeter.
[18:09] <nats`> mil or mm ?
[18:09] <saadzmirza> Dipole half meter
[18:10] <saadzmirza> This mylar: http://www.amazon.com/Mil-Mylar-25-50/dp/B004D4X4MK/ref=sr_1_1?ie=UTF8&qid=1398103804&sr=8-1&keywords=1+mil+mylar
[18:11] <saadzmirza> I see. It's not metric.
[18:11] <SpeedEvil> 1mm mylar is the rigid bit just next to the threads of a coke bottle.
[18:12] <saadzmirza> Just one sec. Wouldn't one mil be much smaller than a mm?
[18:12] <saadzmirza> 25mm in an inch.
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[18:13] <saadzmirza> 25/1000
[18:14] <saadzmirza> Isn't a mil 40 times smaller than an mm?
[18:14] <SpeedEvil> yes
[18:14] <LeoBodnar> i call 2.54um mylar bollox
[18:14] <SpeedEvil> That's mis-sold.
[18:15] <LeoBodnar> http://www.ebay.co.uk/itm/Mylar-Stencil-Film-Sheets-15-x-A4-125-micron-0-125mm-5-mil-/261399356526
[18:15] <SpeedEvil> While it's in principle manufacturable - it is not usable for day-day use.
[18:15] <SpeedEvil> It's also going to be murderously expensive.
[18:15] <LeoBodnar> i have some 5um thick stuff and it's like cobweb
[18:15] <SpeedEvil> They possibly mean 10 and 20 mil
[18:16] <LeoBodnar> it's like measuring BLDC motors in "turns"
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[18:32] <Laurenceb> JAXA have 2micron mylar iirc
[18:34] <SpeedEvil> But not sold on amazon to potheads.
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[18:38] <SpeedEvil> http://www.alibaba.com/product-detail/aluminized-mylar-film_859601319.html claims 6um
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[19:03] <Laurenceb> ive seen 2.5µm aluminized on indoor plane sites
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[19:33] <json34> Hi
[19:33] <json34> Great flight m0xer-6
[19:34] <Upu> possibly still up there
[19:34] <Upu> http://spacenear.us/tracker/
[19:35] <Upu> M0XER-6 = B-46
[19:35] <json34> ok
[19:35] <Upu> M0XER-5 = B-45 which was last seen over India
[19:35] <json34> What lipo type is using?
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[19:35] <SP9UOB-Tom> evening All
[19:36] <Upu> 240mAH I believe custom low temperature chemistry one, its not my payloads its Leo's
[19:36] <Upu> hey Tom
[19:36] <SP9UOB-Tom> SEBA8 recovered :-) http://sp9uob.verox.pl/SEBA8/SEBA_8_found.jpg
[19:36] <json34> Where can i buy the same lipo?
[19:36] <SP9UOB-Tom> http://sp9uob.verox.pl/SEBA8/M%cdSTO.jpg
[19:36] <Upu> nice :)
[19:36] <SP9UOB-Tom> was picked up by tourist
[19:37] <json34> Nice tom
[19:37] <Upu> http://www.amazon.co.uk/240mAh-Battery-Hubsan-Quadcopter-Helicopter/dp/B00CQ1CQLM
[19:37] <Upu> just something like that json34
[19:37] <json34> Is it low temp?
[19:37] <Upu> no idea I think LeoBodnar had his made specially
[19:37] <Upu> but you still can't charge them below 0'C
[19:38] <Upu> is that the GSBC attempt SP9UOB-Tom ?
[19:38] <json34> Gsbc??
[19:39] <json34> Thanks upu
[19:39] <Upu> http://www.balloonchallenge.org/
[19:39] <SP9UOB-Tom> Upu: yeah, but off the competition - they require photos from payload every 3000m
[19:39] <Upu> ah ok
[19:39] <SP9UOB-Tom> to proove the altitude
[19:39] <SP9UOB-Tom> which makes no sense to me
[19:40] <Upu> you'll be pleased to know Team Mexico posted 46km earlier
[19:40] <SP9UOB-Tom> Upu: yes, they was also at arhab.org
[19:40] <SP9UOB-Tom> were
[19:40] <Upu> no this was a launch today
[19:40] <SP9UOB-Tom> strange english grammar :-)
[19:41] <craag> Upu: Verified 46km?
[19:41] <Upu> haha
[19:41] <Upu> yeah right
[19:41] <Upu> waiting on that
[19:41] <SP9UOB-Tom> i want this altimeter :-)
[19:41] <craag> :P
[19:41] <Upu> I want his balloon :)
[19:42] <SP9UOB-Tom> haha
[19:42] <Upu> I shall remain skeptical until proven otherwise
[19:43] <SP9UOB-Tom> is there any altitude profile available ?
[19:44] <SP9UOB-Tom> any abnormalities should be easy to catch
[19:44] <Upu> again waiting on that
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[19:46] <craag> Upu: Where do you find out about these?
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[19:46] <Upu> they posted it on face book earlier
[19:47] <craag> ah ok
[19:47] <daveake_> CSI Yorkshire on the case then
[19:53] <arko> hahaha
[19:53] <arko> i'd watch that
[19:54] <SP9UOB-Tom> maybe mexican's rubber is on drugs ;-) Flying high ;-)
[19:56] <SP9UOB-Tom> f.... rhinitis
[19:57] <daveake_> Mexican hab is going to be sombre
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[19:59] <g0pai_ian> Sombre hombre
[20:01] <daveake_> I was going for sombrero, but that's close :)
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[20:03] <SP9UOB-Tom> Sombra hombre = shadow man (according to google translator)
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[20:19] <SP9UOB-Tom> night all
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[21:12] <hadfield1> hello everyone
[21:12] <hadfield1> looking for links on connecting the NTX2 to the raspberry pi
[21:12] <hadfield1> anybody with experience?
[21:13] <Geoff-G8DHE> http://ukhas.org.uk/guides:raspberrypi_advanced?s[]=rpi
[21:15] <hadfield1> ahh, stupid me didnt jump to the Advanced page
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[21:19] <mfa298> unless you're an experienced coder I'd stay away from the advanced page.
[21:19] <mfa298> the standard approach is to connect the ntx2 to the uart on the Pi as that does all the timing in hardware
[21:20] Action: mfa298 just realises he left :(
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[21:21] <Geoff-G8DHE> The page does suggest that using the UART is the better method.
[21:22] <Rocketmagnet> Hello
[21:22] <mfa298> that might be due to me writing it (although I've not yet connected an ntx2 to the uart on the pi)
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[21:23] <Upu> hi Rocketmagnet
[21:24] <Rocketmagnet> What's going on?
[21:24] <Willdude123_> https://www.youtube.com/watch?v=tq4c86uGMmg
[21:24] <Upu> not much
[21:24] <Upu> waiting to see if any of the 'B' balloons reappear
[21:24] <Upu> http://spacenear.us/tracker/
[21:25] <Rocketmagnet> Is one of them yours ?
[21:25] <Upu> no
[21:25] <Lunar_Lander> evening Upu
[21:25] <Upu> hi Lunar
[21:25] <Upu> afk a bit
[21:25] <Lunar_Lander> today I looked at step-ups a bit
[21:25] <Lunar_Lander> ah ok
[21:26] <Rocketmagnet> Holy Moly!
[21:26] <Rocketmagnet> Is that an actual balloon flight ???
[21:27] <Rocketmagnet> From India to Ireland ?
[21:27] <Geoff-G8DHE> Well its not a chase vehicle that's for sure ! ;-)
[21:27] <Rocketmagnet> heh
[21:28] <Geoff-G8DHE> No your looking at two seperate flights B-45- Silverstone to India, B-46 looping around the UK
[21:28] <Rocketmagnet> I'm going to Kansas to launch a balloon on a couple of months. I hope mine doesn't travel that far.
[21:28] <Rocketmagnet> Oh, right.
[21:28] <Rocketmagnet> What?? Silverstone to India!?
[21:29] <Rocketmagnet> Was there anything valuable in the payload?
[21:29] <Geoff-G8DHE> See http://leobodnar.com/balloons/
[21:30] <Rocketmagnet> My first ever balloon's going to have about £300 of equipment on board. I really hope I don't have to fly to india to get it back.
[21:30] <Geoff-G8DHE> Will there ever be a second one ?
[21:31] <Rocketmagnet> I dunno. This has been a pretty time consuming and expensive business.
[21:31] <Rocketmagnet> I got it for my Dad for cristmas 2 years ago.
[21:31] <Rocketmagnet> Christmas.
[21:32] <Rocketmagnet> It's been a lot of work and learning to get it ready to fly.
[21:32] <Rocketmagnet> Jesus, nobody told me how difficult it would be to implement APRS.
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[21:33] <Rocketmagnet> Speaking of which ... I've just finished writing up my blog posts explaining how to implement an APRS transmitter.
[21:33] <Geoff-G8DHE> The B-flights have both MFSK modes as well as geo-fenced APRS
[21:34] <Rocketmagnet> I would be very grateful if anyone could take a look, and see what you think.
[21:34] <Rocketmagnet> http://hugosprojects.wordpress.com/
[21:35] <Willdude123_> Has anyone ever tried flying a wireless access point? Is airborne wifi legal?
[21:35] <mfa298> Willdude123_: it's been done in other countries (there was a dropbox write up of a couple of them trying it)
[21:36] <mfa298> it might be legal in the UK if you turn the power down.
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[21:36] <Willdude123_> mfa298 that would be interesting.
[21:37] <Willdude123_> How much bandwidth would one mhz of sdr data consume? Is there a way of figuring it out? You could fly an SDR on a payload or quadcopter or something.
[21:37] <Willdude123_> And then tune it from the ground
[21:39] <mfa298> it's quite a lot of bandwidth
[21:39] <mikestir> at least 16 Mbps even for an rtl-sdr. More for something decent
[21:40] <mfa298> I think for 2MHz of bandwidth on the rtl-sdr it's >30Mbps - i.e. more than my wireless could handle
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[21:52] <Willdude123> Well
[21:52] <Willdude123> Wireless N is 150
[21:52] <Willdude123> I think
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[21:55] <mfa298> thats only short range with good power
[21:55] <mfa298> that's also the max radio rate, the actual data rate will be lower
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[22:17] <fsphil> india? wow
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[22:54] <amell> Ever heard of Maestro GPS receiver? Any good?
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[22:59] <Laurenceb> probably better than the car
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[00:00] --- Tue Apr 22 2014