highaltitude.log.20150327

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[07:27] <jcoxon> anyone else having issues with github?
[07:27] <jcoxon> did see that they were under a ddos
[07:28] Nick change: Chetic_ -> Chetic
[07:35] <Maxell> jcoxon: github seems to load fine here.
[07:37] <jcoxon> must have caught it at a bad moment
[07:37] <jcoxon> thank Maxell
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[07:42] <Maxell> np, just saw gqrx addes Wide FM RDS support a week ago :D
[07:43] <jcoxon> oh cool
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[09:04] <Burko> hey Darkside, you there?
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[09:44] <Kryczek> Upu: UpuWork: Hi! I took my RPi+ with your GPS Expansion Board for a drive yesterday from Portsmouth to Gloucester and back, and while I expected it to work of course, I am still amazed by the accuracy: I can see what lane I was driving in, what fuel pump I used, etc! :)
[09:45] <edmoore> ublox modules are good
[09:45] <fsphil> just posted on GPSL: https://www.youtube.com/watch?v=hT4QYOMmysw
[09:46] <daveake> That's not pleasant to watch
[09:47] <fsphil> it's a bit trippy
[09:47] <edmoore> can't figure out what i'm looking at
[09:47] <fsphil> several gopro cameras stitched together to make a 360 deg view
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[09:48] <edmoore> why is the balloon spinning around but the sun not?
[09:48] <Reb-SM0ULC> fsphil: coool, how many cams?
[09:48] <fsphil> they must have corrected for the rotation in software
[09:48] <Vaizki> that's 1080p?
[09:50] <fsphil> looks like 5 or 6 cameras
[09:50] <fsphil> http://www.gizmodo.de/2015/03/24/die-sonnenfinsternis-als-360-grad-video-in-der-stratosphaere.html
[09:51] <fsphil> GSM tracking, "So we did GSM tracking on that thing, which turned out to be over 1km off"
[09:52] <daveake> I wonder if google could be persuaded to point any search of "gsm weather balloon" to a page saying "DON'T!"
[09:52] <Vaizki> aha groupon's deal of the day for me is psychotherapy at -70%
[09:52] <gonzo_> or a 2 for 1 deal for schitzophrenics?
[09:53] <Vaizki> :)
[09:53] <edmoore> my dx.com torch arrived before my amazon torch
[09:53] <edmoore> having been ordered after
[09:54] <Vaizki> eu warehouse?
[09:54] <gonzo_> what do you want a UV torch for though. Apart just ... because
[09:54] <Vaizki> flashaholics in the uk has nice torches, I've bought quite a few from them
[09:55] <Reb-SM0ULC> daveake: there would many things google have to redircet then if the answer should be "DON'T!" ;)
[09:55] <daveake> true
[09:55] <edmoore> UV torches are fun
[09:55] <edmoore> they reveal secrets
[09:56] <gonzo_> hmmm, I can guess. Though not sure I'd want them revieled!
[09:57] <gonzo_> Ah, you mean, what brand of waskhing powder the yesu, of course
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[09:57] <gonzo_> revealed....
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[10:02] <nickjohnson> Woohoo! KS has hit the goal. :)
[10:02] <Vaizki> gooooooooooooooooooool
[10:03] <nickjohnson> L(
[10:03] <nickjohnson> :)
[10:06] <Reb-SM0ULC> nickjohnson: KS ?
[10:07] <nickjohnson> Reb-SM0ULC: kickstarter.com/projects/nickjohnson/tsunami
[10:07] <Reb-SM0ULC> ah
[10:08] <Vaizki> nick, I happened to buy a better signal generator already though.. maybe I can compare ;)
[10:08] <Vaizki> Rohde & Schwarz + Anritsu vs Nick
[10:08] <edmoore> play fair
[10:08] <nickjohnson> heh
[10:09] <nickjohnson> Just scale the SNR and frequency proportional to cost, and I think we might come out okay
[10:09] <Vaizki> edmoore: sure, but I have zero competence in evaluating such things so not sure if it matters :)
[10:09] <Vaizki> nickjohnson, well you know very well that to double the frequency OR snr you're paying 10x :)
[10:09] Action: nickjohnson is going to need to find some serious test eqpt to produce the datasheet, though
[10:09] <Vaizki> to double both you are paying 100x
[10:10] <nickjohnson> Vaizki: Better go on a decibel scale, then
[10:10] <Vaizki> yup
[10:10] <Vaizki> but I'm off to lunch...
[10:10] <nickjohnson> On a related note, I just finished redesigning the AFE for the Tsunami. I like the new design much better.
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[11:16] <Vaizki> afe?
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[12:31] <Vaizki> https://www.kickstarter.com/projects/1034167547/printthebus-the-first-3d-printed-satellite-for-eve
[12:31] <Vaizki> space, moon orbit, 3d printing and arduino
[12:32] <Vaizki> this might be pure kickstarter gold..
[12:32] <SpeedEvil> :)
[12:33] <mattbrejza> they are relying on being able to win a competition
[12:34] <nickjohnson> Vaizki: Analog Front Ed
[12:34] <nickjohnson> er, End.
[12:34] <mattbrejza> oh lol those arduinos
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[12:36] <nick_> "We believe that when space is inaccessible, science is inaccessible"
[12:36] <nick_> Because science only happens in space?
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[12:37] <daveake> it'll change billions of lives
[12:38] <craag> Think of it this way
[12:38] <craag> Blasting 300 arduinos off the face of the planet :)
[12:38] <craag> sounds good to me ;)
[12:39] <UpuWork> not sure you need that many blinking LED's in orbit tbh
[12:40] <nick_> Who wants to network 300 arduinos?
[12:40] <nickjohnson> I like the idea. But I don't see what experiment you could possibly run on an Arduino Pro Mini with no external circuitry
[12:40] <nickjohnson> Also, it only takes one troll per 100 Arduinos to render the I2C bus inaccessible
[12:41] <nickjohnson> Well, unless they power them up individually, I suppose
[12:41] <edmoore> you don't fly i2c in space without bus isolators
[12:41] <nickjohnson> They do say they'll accept other boards, but it seems like it would have made more sense to design a board for the purpose, maybe with an edge connector.
[12:41] <edmoore> cubesat 101
[12:41] <nickjohnson> edmoore: I think they do, look at their stacking.
[12:41] <edmoore> *they* might
[12:41] <nickjohnson> I think they intend to stack the I2C pins directly.
[12:41] <edmoore> but who the fuck knows with kickstarter levels of incompetance
[12:41] <edmoore> (no offence)
[12:41] <nickjohnson> I like the idea of a standard form factor for experiments with an edge connector, though
[12:42] <nickjohnson> heh
[12:42] <adamgreig> edmoore: I know one company who flies I2C in space without bus isolators
[12:42] <nick_> nickjohnson: I think that's becaue you can pay for N neighbouring arduinos.
[12:42] <adamgreig> they ran their UDP IP network over that I2C bus
[12:42] <nick_> So hopefully they just connect your ones.
[12:42] <edmoore> but like people who build cubesats and think about it and read literature and try and get advice before diving in, they isolate i2c
[12:42] <craag> They've got a pic with >115 people under "WHO'S THE TEAM?"
[12:42] <craag> sorry >15
[12:42] <craag> THen they name 2 of them.
[12:43] <nickjohnson> And I don't think "we have to win the contest first" is a showstopper - people look at KS exclusively as a 100% guaranteed preorder service too much.
[12:43] <nick_> But, if they all just share the common sensors, why not just time share them?
[12:43] <nick_> ie, have one arduino and load up new code every day/hour/whatever/
[12:44] <nick_> As an aside, do the atmegas actually work in space?
[12:45] Action: nick_ remembers sitting in talks about space grade FPGAs that cost £££
[12:45] <nickjohnson> I love the retention animation: "Displacement Exaggerated for Clarity"
[12:45] <nickjohnson> nick_: Are there any shared sensors? I don't think it says.
[12:45] <craag> depends on your definition of 'work'
[12:45] <nick_> nickjohnson: it says that you can use the cubesat's sensors.
[12:46] <nickjohnson> Oh, "you can read status data from our satellite". That's pretty vague
[12:46] <nickjohnson> But they also say "or use your own sensors"
[12:46] <nickjohnson> And I don't know how that's possible unless you submit your own board in place of the Pro Mini
[12:46] <nick_> Ah
[12:46] <nick_> yeah, presumably in the spaec of a mini.
[12:46] <adamgreig> pro mini has a temperature sensor inside the avr
[12:46] <adamgreig> I imagine that's what they mean
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[12:47] <nick_> I guess this would be why you buy a few slots though.
[12:48] <nick_> One pro mini + n sensor boards in the same format?
[12:48] <SpeedEvil> On a somewhat off-topic topic - http://www.chinalawblog.com/2015/03/china-factory-problems-always-your-fault.html
[12:48] <SpeedEvil> This is very illustrative of why KS/china often results in screwingup
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[12:48] <nickjohnson> adamgreig: Do we need 300 temperature sensors, though? That's kind of a pathetic experiment.
[12:49] <adamgreig> well indeed
[12:49] <nickjohnson> nick_: I don't see the multi slot rewards, only "add your own 3d printed thingy" ones
[12:49] <nick_> HOW CAN I GET INVOLVED?
[12:49] <nick_> 1. Support us and we'll send you an Arduino Pro Mini.
[12:49] <nick_> ($98 gets you two Arduinos in adjacent slots, $147 gets you three, and so on...build your own network!)
[12:49] <nickjohnson> The pro mini just seems like a poor form factor. It's about the right size, but a custom interface would make much more sense.
[12:49] <nickjohnson> Oh, hm, I missed that.
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[13:33] <infaddict> any launches tomorrow?
[13:33] <infaddict> !flights
[13:33] <SpacenearUS> 03infaddict: Current flights: 03EDUPICDX2 10(4830), 03Pecan Femto rev 2 Test 10(7acc)
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[13:47] <diegoesep> hello all
[13:48] <diegoesep> did anyone managed to generate 50 BAUD FSK RTTY with sx1276 LoRa chip? daveake craag ?
[13:48] <craag> Yes
[13:48] <craag> Easily
[13:48] <craag> with the rfm9x modules anyway
[13:49] <diegoesep> good can you explain please? I'm struggling with the FSK mode to generate 50bps from 600/1200bps
[13:49] <craag> There's mention in the datasheet of doing low datarate FSK by shifting the lower bits of the frequency register
[13:49] <craag> Or you can key the FSK with one of the DIO pins
[13:50] <diegoesep> what method did you used?
[13:50] <Vaizki> I was going to try that myself as well so interesting..
[13:50] <diegoesep> when I send data to the FIFO at 600bps
[13:50] <diegoesep> for example if I always put 0xFF in the FIFO
[13:51] <diegoesep> it still generate spurious low freq carrier
[13:51] <craag> Yeah doesn't work like that
[13:52] <craag> one sec, trying to find the section in the datasheet
[13:52] <Kryczek> hi
[13:52] <Kryczek> may I ask why you are trying to slow down the data rate?
[13:52] <craag> diegoesep: Section 5.3.3 PLL
[13:53] <craag> in the italics Note
[13:53] <craag> p77
[13:53] <diegoesep> This allows the potential for user generation of m-ary FSK at
[13:53] <diegoesep> very low bit rates.
[13:53] <diegoesep> ok thanks!
[13:53] <craag> np :)
[13:54] <diegoesep> that open the door for other modulation too !
[13:54] <craag> yep
[13:54] <diegoesep> good
[13:54] <craag> although you are limited by the step size
[13:54] <Kryczek> ah ok, I thought it might be because of long distance or something and was going to suggest Forward Error Correction etc
[13:54] <craag> Kryczek: We have a legacy standard of using 7n2 RTTY
[13:54] <craag> With ASCII telemetry strings
[13:55] <Kryczek> thanks
[13:55] <craag> it's not efficient
[13:55] <Kryczek> I am very new to all high altitude ballooning :)
[13:55] <diegoesep> craag, do you have source code using the fsk with PLL ?
[13:55] <craag> but it works - and so even with the new stuff - we tend to use it as backup :)
[13:56] <craag> diegoesep: I can't share my code at the moment - but basically you just rewrite the frequency register when you want it to shift.
[13:57] <diegoesep> ok I will try that with sending a bunch of 0 to the FIFO :)
[13:57] Nick change: Family -> Lammergeier
[13:58] <Vaizki> hmm ok that was different from what I was thinking
[13:58] <diegoesep> how did you manage to generate a constant fsk output?
[13:59] <Vaizki> maybe I read the datasheet wrong earlier but I was thinking of trying continuous mode FSK
[13:59] <Vaizki> where the radio will clock my uC when it needs a new FSK bit
[14:00] <diegoesep> with the solution of craag you have more than 2 frequencies
[14:00] <Vaizki> yes but I don't need more
[14:00] <Vaizki> :)
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[14:00] <diegoesep> ok I understand
[14:01] <Vaizki> I don't think that craag's method would allow for DomEx
[14:01] <diegoesep> I was thinking also about using the continuous mode and using DIO from the µC
[14:01] <diegoesep> but first I wanted to try to do 800 bps for example, and group 8 by 8 the bits to have 100bps
[14:01] <diegoesep> but that doesn't work yet
[14:03] <tweetBot> @daveake: New blog post - the BBC Stargazing flight http://t.co/uKhEQy8H8L #ukhas #RaspberryPi #stargazing
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[14:04] <Vaizki> yea my investigation was a bit stalled by my realization that 1200bps seems to be the minimum supported by the chip's own FSK
[14:05] <Vaizki> but I like to tinker :)
[14:08] <nick_> I just read the risks for the 300 arduinos cubesat
[14:09] <mattbrejza> risk: we get through the nasa competition and actually have to use the money for something
[14:09] <nick_> They list 3 risks: 1) they don't get funded, 2) they break the cubesat during test, 3) an experiment doesn't work.
[14:11] <Vaizki> what about the risk that nasa doesn't choose their arduino space dump?
[14:11] <nick_> Not mentioned.
[14:11] <Vaizki> well I'm pretty sure that box is not going to space without a nod from NASA :)
[14:12] <nick_> Yeah
[14:12] <nick_> It has to go through NASA's testing.
[14:13] <nick_> And presumably get the top ranking on the ground based challenge for them to bother testing it?
[14:15] <Vaizki> and I think they changed their whole project idea based on the first comment they got
[14:16] <Vaizki> initially it seemed like a box full of 3d printed "experiments".. and then it magically transformed into an arduino space burial mission
[14:19] <mattbrejza> '...please make sure your circuit is self-supporting with a battery.'
[14:19] <mattbrejza> lol
[14:19] <Vaizki> what
[14:19] <mattbrejza> https://www.kickstarter.com/projects/1034167547/printthebus-the-first-3d-printed-satellite-for-eve/comments
[14:20] <Vaizki> that was a week ago
[14:21] <Vaizki> Power consumption for your experiment can be up to 150mA or 0.5W. Although 0.5W x 300 experiments would be a lot of power, we'll only turn-on groups of devices in specific time slots.
[14:21] <mattbrejza> oh theyve changed their mind
[14:21] <mattbrejza> sounds like this is all very well thought out
[14:21] <Vaizki> that's what I was referring to when I said they changed the whole plan :)
[14:21] <mattbrejza> ah
[14:23] <mattbrejza> hmm $49 to put up one cubic inch
[14:23] <Vaizki> I think KS contacted them with a stern note about "what's this about a 3D printed project that doesn't have Arduino in it?"
[14:23] <SpeedEvil> It would be awesome if you could just do microcubesats very cheap and free flying
[14:23] <SpeedEvil> I'd quite like to be able to orbit a 2.5cm cube say.
[14:24] <daveake> you'd need to be very small
[14:24] <craag> the kicksat idea was nice conceptually
[14:24] <mattbrejza> i might put 8 of these in my cubic inch https://www.kickstarter.com/projects/1014603694/forge-solid-denser-than-solid-uranium
[14:24] <craag> shame about the implementation though
[14:24] <Vaizki> they already track half a million pieces of "satellites" or "debris" up there
[14:25] <mattbrejza> hmm 1" of tungsten is only 300g. how dissapointing
[14:25] <Vaizki> but that kilo cube looks the business.
[14:26] <Vaizki> now I want one.
[14:26] <Vaizki> good for holding down napkins outside.
[14:26] <Vaizki> 200 usd? eep!
[14:26] <mattbrejza> i wonder if theyll start selling other elements in cube form
[14:29] <Vaizki> I wonder how close to exactly 1kg it's going to be..
[14:30] <SpeedEvil> I want a cube of purest green.
[14:30] <Vaizki> I think the kilogram is the only SI unit with a physical reference model?
[14:30] <Vaizki> some silicon sphere thing
[14:30] Nick change: Elwell_ -> Elwell
[14:31] <SpeedEvil> not yet
[14:31] <SpeedEvil> it's still officially a Pt/Ir bar
[14:31] <Vaizki> oh ok
[14:31] <SpeedEvil> The silicon spehere is one of the candidates
[14:33] <myself> I want to hear its stump speech.
[14:33] <Vaizki> a 1kg tungsten sphere.. it would probably kill my kids in 5 minutes or at least the floor
[14:34] <myself> http://la.cacophony.org/CS_cement.html
[14:34] Nick change: fl_0 -> fl_0|afk
[14:35] <myself> ""Oh! That's a cute bear," I remarked as I reached for a Cuddler. Without warning, it was placed in my hands, which naturally were prepared to be unprepared for its weight. Another thunderous crash!"
[14:41] <Reb-SM0ULC> Vaizki: you know tungsten is swedish for "heavy stone" ? :)
[14:46] <Vaizki> yes and I also know tungsten is volfram in swedish ;)
[14:48] Nick change: number10_ -> number10
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[14:52] <tweetBot> @DutchMillbt: NASA's Super Pressure Balloon launched successfully from #Wanaka airport : http://t.co/WwtOhtCqGS #ukhas
[14:53] <mattbrejza> can we import that onto snus? ^
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[14:54] <arko> oooo
[14:54] <arko> that would be very cool
[14:58] <Vaizki> I will pitch in with this
[14:58] <Vaizki> http://www.csbf.nasa.gov/map/balloon9/Track662NT.xml
[14:58] <Vaizki> but I don't have time or access to write an importer ;)
[14:59] <mattbrejza> lz1dev: ^ ;)
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[15:01] <craag> I should probably be slapped for this. But that's one of the nicest XML files I've seen in a while :)
[15:01] <adamgreig> practically parsable
[15:01] <adamgreig> though like, this is incredibly gross:
[15:01] <adamgreig> <trk> inside <Track>
[15:03] <craag> Ah yes - had to hold on to it's traditions somewhere.
[15:04] <Vaizki> Needs more namespaces
[15:04] <Vaizki> And xpointer
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[16:50] <Kryczek> Hi! Does anyone here use Chrony instead of NTPd? I cannot seem to get it to use PPS even though ppstest works and I tried both SHM1 and SOCK
[17:00] <Vaizki> if a spectrum analyzer says it can do SSB demodulation for a 12.5kHz channel and has an audio output.. It might be usable as a HAB radio? :)
[17:00] <adamgreig> haha perhaps
[17:00] <mattbrejza> i think youll find the sensitivity will be shit tbh
[17:00] <adamgreig> yea
[17:01] <edmoore> Vaizki, yes i think so
[17:01] <edmoore> at work we have an IFR thing with a similar sounding input can decode hab telem fine with it
[17:01] <edmoore> a 'communications test system' or something
[17:03] <Vaizki> right... I ended up with 4 comm test units and a handheld SA in 2 auctions...
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[17:04] <mattbrejza> does the auction guarantee these things will work?
[17:04] <Vaizki> the handheld SA at least demods SSB
[17:04] <Vaizki> The handheld SA is new in box from importer so yes for that
[17:05] <Lunar_Lander> hello
[17:05] <Vaizki> The comm testers were 150-350 euros each so no
[17:05] <mattbrejza> oh right
[17:05] <Vaizki> They are 30k+ new
[17:07] <Vaizki> The handheld SA was only 200¬ as well :)
[17:07] <Vaizki> I will test the lot and sell extras to friends at cost
[17:08] <edmoore> which model test set?
[17:08] <Vaizki> R&S cmu200 and crtu-ru
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[17:09] <edmoore> what freq does it go up to?
[17:10] <Vaizki> I think 2.7G
[17:10] <Vaizki> I will see in 2 weeks
[17:10] <Vaizki> http://www.testequipmentdepot.com/protek/analyzers/7830.htm
[17:10] <Vaizki> That's the SA
[17:10] <Vaizki> With SSB
[17:10] <edmoore> nice
[17:11] <edmoore> looks like you did well
[17:14] <Babs____> Edmoore - saw your capacitor feedback yesterday when I got up - cheers
[17:14] <edmoore> remind me
[17:14] <edmoore> oh yes
[17:14] <edmoore> dielectrics
[17:14] <edmoore> np
[17:14] <edmoore> another fun thing
[17:15] <edmoore> x5r and x7r and other of the high density ones have a slightly piezo effect
[17:15] <Babs____> Why do people dislike tantalum capacitors ? They sound space age so they must work right ?
[17:15] <edmoore> i.e. movement/flexing causes a voltage and vice-versa
[17:15] <edmoore> tantalum was a conflict mineral
[17:15] <edmoore> also they explode in a very firey way
[17:15] <edmoore> they fail to a short
[17:16] <edmoore> and also ceramics have improved a lot in recent years
[17:16] <Babs____> Presumably none of this is a problem for my little board
[17:16] <Babs____> Outside of the conflict mineral bit
[17:16] <edmoore> but back to the piezo thing - so if i used them on a rocket engine intrument, they'd pick up the roar
[17:16] <edmoore> and turn that vibration into a voltage
[17:16] <Babs____> Is it movement or flexing ?
[17:16] <edmoore> which would interfere withmy readings
[17:16] <edmoore> flexing
[17:16] <edmoore> internal shear
[17:17] <edmoore> no biggy for a hab flight computer no
[17:17] <Babs____> Ok cool
[17:17] <mattbrejza> so you avoid even for decoupling?
[17:18] <craag> I look forward to the day I have to worry about ed's type of problems ;)
[17:18] <edmoore> but bear in mind if it's in the signal path of a high vibration environment
[17:18] <edmoore> sometimes in electronics (laptops or monitors or whatever) when you hear a very high pitch squeel, that's the capacitors on the switching power supplies vibrating
[17:18] <edmoore> i don;t avoid for decoupling no
[17:18] <Babs____> Flash guns charging
[17:18] <edmoore> unless it's something sensitive
[17:19] <mattbrejza> AA filter decoupling?
[17:20] <edmoore> should be fine in there as most good modern op-amps have a PSRR of like >100db into the tens of khz
[17:20] <mattbrejza> ah ok
[17:20] <edmoore> i used x2y caps for the aa decoupling though
[17:20] <edmoore> so the effect would be balanced equally on each rail
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[17:22] <edmoore> but yeah the psrr is well up well above the aa cutoff freq so i din;t loose any sleep
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[17:22] <mattbrejza> :)
[17:26] <edmoore> avx have v good documentation for a lot of this stuff
[17:26] <edmoore> makes me inclined to use their parts
[17:27] <Babs____> Is the only impact of clocking 8mhz vs 16mhz lower calculation speed (ignoring energy saving?) - ie program runs slower, but that clearly is less of an issue in a tracker
[17:28] <edmoore> correct
[17:28] <mattbrejza> also all your timings will be off
[17:28] <edmoore> sure, you obv have to adjust for timings
[17:28] <mattbrejza> (potentially)
[17:29] <Babs____> Not in be program , just in the hardware right?
[17:29] <Babs____> Program being my code rather than boot loader
[17:29] <edmoore> i think there has only been one recorded incident in this channel where someone didint realise that changing their clock frequency would change their timings
[17:30] <edmoore> your software might need changing yes
[17:31] <mattbrejza> if youre lucky the arduino libraries might know the clock frequency and adjust your serial port speed settings and stuff like that
[17:31] <edmoore> yeah indeed
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[17:32] <Babs____> I'll look it up but the useful thing to know is to watch out for weird effects or results. Or lack of results .
[17:33] <mattbrejza> your code will probably run fine down to 1MHz or so
[17:33] <mattbrejza> if not further
[17:33] <mattbrejza> hab trackers really dont have to do much
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[17:33] <edmoore> indeed - you can certainly turn nmea into rtty with 1mhz on an 8-bit micro
[17:33] <edmoore> that's plenty
[17:34] <Babs____> I'm only doing it to make the atmega work at 3v3 really
[17:34] <edmoore> if you think it isn't then go and read about the apollo command module computer
[17:34] <edmoore> i sometimes remind myself that the scout rockets in the 70s could routinely fly into a circular orbit with a paper-tape control system
[17:34] <Babs____> 1203 alarm
[17:34] <myself> i'm sometimes astonished when edmoore reminds me that
[17:35] <Babs____> 1203 alarm is what I am going to get soldering teeny tiny components
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[17:40] <edmoore> Babs____, so we did the first firing of this new engine on monday
[17:41] <edmoore> the one i started working on at i think the 2013 ukhas conf
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[17:42] <edmoore> it was quite a happy moment
[17:42] <edmoore> we now have to get down to just dispassionately doing a great deal of research with it, as it's a research tool
[17:42] <edmoore> but it was fun for the first couple of firings to just watch and feel how loud and scary it is
[17:43] <Babs____> So was it a full run?
[17:43] <Babs____> As in a beta of the complete thing?
[17:44] <edmoore> just short burns so far
[17:44] <Babs____> Oooo cool
[17:44] <edmoore> need a bit more hardware to build up to the long duration runs
[17:44] <edmoore> but we have a test programme to get through with the short burns which will inform the longer stuff
[17:44] <Babs____> You only need to run it for 30 seconds to reach Sydney
[17:44] <Babs____> Ish
[17:45] <edmoore> also short burns because even though you think you can do heat transfer sums properly, you still don't want to risk it on the first run
[17:45] <edmoore> and have molten steel and copper spewing out of the nozzle
[17:45] <edmoore> that would be bad and expensive
[17:45] <Babs____> Must be quite cool for mr bond to see his 1980s theory work in practice now he has the materials to play with
[17:47] <edmoore> https://www.dropbox.com/s/mtlawr6n92qji0q/2015-03-23%2016.57.05.jpg?dl=0
[17:47] <edmoore> there you go
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[17:47] <edmoore> that was monday just after we fired
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[17:47] <Babs_____> Right, I am off to a run a heavier risk profile than your engine by cycling through the west end at rush hour on a Friday . Laters
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[17:57] <edmoore> 2 bodies have been found in the stretch of thames by my house in the last 2-3 weeks
[17:57] <edmoore> not the best
[17:58] Nick change: fl_0|afk -> fl_0
[17:58] <Hiena> Guess, time to move the fishing nets, isn't it?
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[18:01] <fsphil> and I thought where I lived was bad
[18:02] Nick change: fl_0 -> fl_0|afk
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[21:21] <Vaizki> hey tomorrow is Arduino day!
[21:21] <Vaizki> atmel actually sent me an email clamoring this joyous occasion
[21:21] <fsphil> should I buy it a card?
[21:21] <Vaizki> Get remarkable discounts on a number of Arduino ® board and compatible shields that will be on sale for up to 30% off at SparkFun Electronics.
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[21:22] <Vaizki> fsphil: you could sponsor sending 300 arduinos into space
[21:22] <fsphil> haha
[21:22] <Vaizki> I think they're guaranteed to never come back
[21:23] <fsphil> I do have one, and have used it. sometimes handy to try things out on
[21:23] <fsphil> I just hate the IDE
[21:23] <fsphil> shame we can't send that into space
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[21:25] <x-f> that could qualify as space junk
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[21:28] <Vaizki> I use arduino a lot because well it's a good tinkering thing for my 13yo son and very easy to show stuff to him
[21:28] <fsphil> yea. I do wish they had gone with 3.3v to begin with
[21:28] <Vaizki> me too
[21:29] <Vaizki> 5V was legacy already when they started
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[21:45] <tridor> begginer trying to track first signal with my SDR - got something around 430.072Mhz - likely to be HAB?
[21:47] <gonzo_nb> not at 430mhz. HABs tend to be 434.075 to 434.650
[21:47] <gonzo_nb> but there are nots of other things in that band, as it's a licence exempt allocatio
[21:48] <gonzo_nb> so lots of alarms/energy meters/key fobs etc
[21:48] <tridor> sorry my bad - actually is on 434.072
[21:48] <gonzo_nb> also check on spacenear.us for any flying balloons
[21:49] <gonzo_nb> not all are on there, but most uk ones
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[21:50] <tridor> regular beeps, about 150 miles from my location - EOS_T1 on habhub tracker?
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[21:53] <fsphil> how do you know how far it is?
[21:53] <gonzo_nb> that balloon looks to be on the ground. Probably doing some testing
[21:53] <gonzo_nb> btw, anyone know who the eos-t1 is?
[21:54] <tridor> on the map it looks to be 150 m from me but if on ground I guess i'm pivking up something else
[21:54] <fsphil> doesn't sound familiar
[21:54] <fsphil> oh gotcha
[21:54] <gonzo_nb> beeps or chirps?
[21:54] <fsphil> yea likely to be something more local
[21:55] <gonzo_nb> a chirp could be some domestic wireless device
[21:55] <tridor> regular beeps/chirps every second
[21:55] <tridor> boooo, thought I had my frist track, keep trying
[21:56] <fsphil> https://www.youtube.com/watch?v=_Ua21FSnIXc
[21:56] <gonzo_nb> if you look around 433.900 you will prob see a whole mess of domestic wireless traffic
[21:56] <fsphil> you can hear what a typical 50 baud rtty hab signal sounds like here
[21:56] <fsphil> not all use this mode but it's pretty common
[21:57] <fsphil> the signal fading in and out often gives them away too
[21:58] <gonzo_nb> tridor, by all means get your system running and get used to configuring it, listening to this local stuff (I use local stuff as a sanity check on the systemanyway)
[21:58] <gonzo_nb> but wait till there is a real ballon flight scheduales, with a known freq to listen on
[21:58] <fsphil> !flights
[21:58] <SpacenearUS> 03fsphil: Current flights: 03EDUPICDX2 10(4830), 03Pecan Femto rev 2 Test 10(7acc)
[21:59] <fsphil> don't see anything on the list for this weekend
[21:59] <fsphil> eclipse day tired everyone out? :)
[21:59] <gonzo_nb> last weekend looks to have got all the flights
[21:59] <gonzo_nb> snap
[22:00] <SA6BSS> in 90min there will be a lot of weather balloons up in 401-406Mhz
[22:00] <fsphil> that was fun, even if my own went badly
[22:00] <gonzo_nb> what jappened?
[22:01] <fsphil> peak altitude of about 800m :)
[22:01] <gonzo_nb> oops
[22:01] <fsphil> it hit the clouds and bounced back
[22:01] <fsphil> splashed down in a lake
[22:01] <gonzo_nb> float attempt?
[22:01] <fsphil> yea. which it kinda did
[22:01] <SA6BSS> :)
[22:01] <gonzo_nb> hehe
[22:01] <fsphil> it's my first to land and take off again
[22:01] <gonzo_nb> payload?
[22:02] <fsphil> landed in a field just outside town for a few minutes
[22:02] <fsphil> standard Pi + Picam
[22:02] <tridor> Thanks for the rtty signal clip, How can I found out the launch schedules and frequencies?
[22:02] <fsphil> most launches are announced on the ukhas mailing list tridor
[22:02] <fsphil> !wiki mailing
[22:02] <SpacenearUS> 03fsphil: Wiki page 03mailing_list (ukhas) - 12http://ukhas.org.uk/ukhas:mailing_list
[22:02] <gonzo_nb> look for the mailing list on google groups @ukhas@
[22:02] <fsphil> woo
[22:02] <tridor> thanks fsphil
[22:03] <gonzo_nb> cheat
[22:03] <fsphil> :)
[22:03] <fsphil> I have some He left from that flight, and some 100g balloons
[22:03] <gonzo_nb> also the right hand pane on the tracking page has scheduals.
[22:03] <fsphil> not sure how high or far I can get a Pi-based payload under such a small balloon
[22:03] gb73d (~gb73d@81-178-186-205.dsl.pipex.com) left irc:
[22:03] <gonzo_nb> I have some 100g to use up too
[22:04] <gonzo_nb> can I be arsed to get a bottle, or just get a disposable
[22:04] <SA6BSS> far from all is announced, load http://tracker.habhub.org/ in your phone and check frequently, especially in weekends
[22:04] <gonzo_nb> would just be simple rtty tracker, nothing interesting
[22:05] <fsphil> yea it would need to test something new for me to bother lauching
[22:05] <fsphil> I could launch an arduino mini transmitting an nbtv test pattern
[22:05] <gonzo_nb> that would be interesting
[22:06] <fsphil> would be pretty simple too
[22:06] <fsphil> load a short video clip into it
[22:06] <gonzo_nb> I could probably get someone to listen with a mechanical rx
[22:06] <fsphil> the format probably isn't compatible
[22:06] <fsphil> though if they got the timing right it might display something
[22:06] <gonzo_nb> 32line?
[22:06] <fsphil> nah
[22:07] <fsphil> 40 lines
[22:07] <gonzo_nb> HD!
[22:07] <fsphil> lol
[22:07] <fsphil> 48x40 it works out at
[22:07] <gonzo_nb> the 405 line was considered high def
[22:08] <gonzo_nb> (or 377i as I wind the tv-ophiles uo with
[22:09] <gonzo_nb> I assume digital?
[22:10] <fsphil> nah, analogue
[22:11] <gonzo_nb> nice. Suitably silly. I approve.
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[22:16] <fsphil> digital sync signal
[22:16] <fsphil> probably over did it
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[22:46] <Ian_> Nothing wrong with where edmoore lives, it's a few miles upstream where the problem is and the bodies begin their journey
[22:48] <fsphil> heh
[22:49] <Laurenceb_> s/is/lives ?
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[23:00] <DL7AD> good morning!
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[00:00] --- Sat Mar 28 2015