highaltitude.log.20140212

[00:20] <aadamson> 63.9ms, I think we're good :)
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[00:26] <Lunar_Lander> :)
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[03:13] <Prometheus> Anyonr flying today?
[03:16] <gurgalof> morning!
[03:17] <Prometheus> GM
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[04:15] <adwiens_KC0WYS> hey
[04:15] <adwiens_KC0WYS> ping Prometheus
[04:16] <Prometheus> pong
[04:16] <adwiens_KC0WYS> thionyl test: http://adwiens.com/projects/balloons/batt/index.html
[04:18] <Prometheus> looks the same to me?
[04:18] <adwiens_KC0WYS> hm maybe its cached
[04:18] <adwiens_KC0WYS> plot: http://adwiens.com/projects/balloons/batt/er14250.gif
[04:18] <Prometheus> roger
[04:18] <adwiens_KC0WYS> and http://adwiens.com/projects/balloons/batt/capacity.png
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[04:20] <Prometheus> Ok I see the Omni cell graph
[04:21] <gurgalof> that doesn't look too good
[04:21] <adwiens_KC0WYS> yea 32mA was too high
[04:21] <adwiens_KC0WYS> I continued the test at 5 mA and it hasnt gone below 3v yet, still running
[04:21] <Prometheus> yeah it looks awful in fact
[04:22] <adwiens_KC0WYS> yea the internal resistance is just too high
[04:22] <Prometheus> hummm
[04:23] <Prometheus> thanks a bunch for taking the time to run a test
[04:23] <Prometheus> I'll have to make some comparisons
[04:28] <adwiens_KC0WYS> that would be interesting to see
[04:29] <Prometheus> yeah it's important enough to warrent the data
[04:30] <Prometheus> I did not do the test we ran I just looked at the final data
[04:31] <Prometheus> Our aplication was slightly different as well
[04:32] <Prometheus> if your circut remains the same the impeadance will change between 1.5 and 3v
[04:33] <Prometheus> your losses are higher?
[04:33] <adwiens_KC0WYS> what do you mean
[04:34] <Prometheus> if the circut is the same higher voltage will dissipate more power correct?
[04:34] <adwiens_KC0WYS> yes
[04:35] <adwiens_KC0WYS> its a constant current circuit so the power is proportional to the voltage
[04:35] <Prometheus> perhaps I'm too busy to look close enough at the moment
[04:36] <Prometheus> I'll take a closer look here in a bit
[04:36] <adwiens_KC0WYS> sure
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[04:41] <Prometheus> interesting circuit you devised there
[04:41] <adwiens_KC0WYS> thanks
[04:43] <adwiens_KC0WYS> the 4.4 ohm resistor decides the current so it was different for the thionyl test
[04:43] <adwiens_KC0WYS> the rest was the same
[04:43] <Prometheus> tell ya what I'll build one just like it and tinker with it
[04:43] <adwiens_KC0WYS> nice!
[04:44] <Prometheus> I'm a hands on guy
[04:46] <Prometheus> yeah ok changeing the risistor makes sense
[04:50] <Prometheus> we did pull down to -40 C that's the only real diffrence I see so far
[04:50] <adwiens_KC0WYS> how did they do
[04:51] <Prometheus> I'll have to go out to the shop and dig around for the data on that computer out there when I have the time
[04:51] <adwiens_KC0WYS> ok
[04:52] <Prometheus> I'm busy writing documentation on cold days (which I loath by the way)
[04:52] <adwiens_KC0WYS> heh
[04:53] <Prometheus> As you can see I didn't think spelling and grammer where important enough to warrent space in my head
[04:53] <Prometheus> lol
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[04:54] <Prometheus> People that peve on spelling and grammer anoy me to no end
[04:54] <Prometheus> lol
[04:55] <Prometheus> I don't care or have time for it
[04:55] <Prometheus> unless forced
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[05:19] <Oddstr13> well, it does help to spell properly, in order to get your message across clearly
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[07:03] <Reb-SM3ULC> Sounds like great balloon-weather in uk at the moment.
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[08:02] <keydash> morning
[08:05] <fsphil> morn
[08:08] <Maxell> hai
[08:08] <keydash> I can't manage to set the ublox to flight mode :/
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[08:31] <Chetpi> keydash: I highly recommend connecting it to your pc and using https://www.u-blox.com/en/evaluation-tools-a-software/u-center/u-center.html
[08:32] <Chetpi> you can easily set it to flight mode that way, and study the commands it sends
[08:35] Nick change: Chetpi -> Chetic
[08:36] <keydash> Chetic:
[08:36] <keydash> i'm seeing my lat lon in the u-center
[08:36] <keydash> you mean set airbone 1g?
[08:36] <Chetic> yes, that's what you want
[08:37] <Chetic> keep in mind it will forget that setting when it loses power
[08:38] <keydash> even with eeprom?
[08:38] <fsphil> I don't know if it saves to the eeprom automatically
[08:38] <fsphil> you might have to tell it to
[08:39] <keydash> yeah
[08:39] <keydash> i need to tell to it
[08:39] <keydash> I dunno why the arduno code doesn't work
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[08:45] <fsphil> how do you know it didn't?
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[08:47] <keydash> i get ack failed
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[08:53] <DL7AD> morning
[09:02] <DL1SGP1> Guten Morgen Sven
[09:02] <DL1SGP1> Good morning folks
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[09:20] <LeoBodnar> morning *
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[09:22] <Prometheus> GM Leo
[09:24] <LeoBodnar> do you ever sleep lol?
[09:24] <LeoBodnar> properly
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[09:42] <Prometheus> not really, I cat nap
[09:43] <Prometheus> 2 here 4 there
[09:44] <Prometheus> working on a rogallo project at the moment
[09:45] <Prometheus> for payload recovery
[09:45] <Prometheus> how about you?
[09:46] <LeoBodnar> i have day job lol
[09:47] <LeoBodnar> too many projects going on at once
[09:47] <LeoBodnar> so there is a high task switching overhead
[09:48] <LeoBodnar> rockoon payload recovery?
[09:48] <Prometheus> posiably
[09:48] <Prometheus> Looking at supersonic waverunner design
[09:49] <Prometheus> creates lift from the compression wave
[09:51] <Prometheus> just a side track to get my mind off other things at the moment
[09:51] <Prometheus> come back fresh to real problems
[09:52] <Prometheus> this is my day job :)
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[09:52] <Prometheus> barely making a living but enjoyable
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[10:15] <Lunar_LanderU> hello
[10:15] <brainles71> howdy
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[10:47] <cm13g09> LeoBodnar: You and I have a similar issue then ;)
[10:47] <cm13g09> High task switching overheads!
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[11:09] <LeoBodnar> heh
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[11:45] <tweetBot> @daveake: I'm back on telly (twice in one week!) in "Cracking The Code" on Friday at 5am - http://t.co/1rfskrb2g1 #RaspberryPi #UKHAS
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[11:51] <LeoBodnar> " They meet the visual effects artists who work on Doctor Who, test out Formula 1 racing simulators, play football with robots, and meet a man who has sent his miniature computer into space. "
[11:52] <LeoBodnar> ... but it only got to stratosphere :)
[11:53] <LeoBodnar> * glad eroomde is offline
[11:53] <LeoBodnar> or is he?
[11:54] <LeoBodnar> BBC is keen because government recently said we all need to know "how to code"
[11:55] <LeoBodnar> Jeremy Paxman has been interviewing a lass that had no idea what "coding" is (and neither did he) but they had energetic discussion about it for 15 minutes.
[11:55] <craag> Although of course knowing what 'coding' is, is not a requirement to tell people that.
[11:56] <LeoBodnar> the closest they came up to it when the lass said "it's html"
[11:57] <LeoBodnar> ad she is hoping to be able "to code" by the end of the year
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[11:57] <LeoBodnar> I am afraid it is going to be like driving licence test
[11:58] <LeoBodnar> Sheeesh I can code now. I couldn't at all just two days ago.
[11:58] <nats`> be able to code means nothing....
[11:58] <nats`> that's what most of people don't understand
[11:59] <LeoBodnar> One mighty push with a Highway Code on Monday evening and you pass theory test
[11:59] <nats`> doing algo and thinking is the real coding
[11:59] <Geoff-G8DHE> and they plan to teach the Teachers in one day ... :-(
[12:00] <LeoBodnar> Conan Doyle could code
[12:01] <daveake> His code was elementary
[12:01] <nats`> every people using a language is basically coding :D
[12:02] <nats`> but many of them code crap c.f. texting
[12:02] <nats`> :D
[12:06] <craag> It was clear whe hadn't thought about the 'how long does it take to learn how to teach coding' question
[12:07] <craag> s/whe/she/
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[12:43] <fsphil> I'm still learning
[12:45] <craag> Me too.
[12:47] Action: cm13g09 flails as a hive of angy bees attacks
[12:47] <cm13g09> (in the form of D3 and OpenERP)
[12:47] <fsphil> B's?
[12:48] <fsphil> thought Leo had done someting
[12:48] <fsphil> launched an attack from the B-hive
[12:48] <cm13g09> lol
[12:48] <craag> haha
[12:49] <cm13g09> nice one fsphil
[12:49] <cm13g09> no... trying to shoehorn graphs into the company's product
[12:50] <cm13g09> which doesn't do much other than forms/tables by default
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[13:36] <keydash_> hello
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[13:41] <Lunar_LanderU> hello again
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[14:02] <keydash_> re-hello
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[14:45] Nick change: Sytex_AWAY -> Sytex
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[15:05] <Sytex> Hi!
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[15:06] <Sytex> Tomorrow will, be the 2nd birthday of MASAT-1, the first hungarian satellite! We will release a 80cm foil ballon with a tiny beacon on it.
[15:06] <Sytex> There will be no GPS on it
[15:07] <Geoff-G8DHE> Beacon freq ?
[15:07] <Sytex> It will send the 'Happy Bithday MASAT-1 de HA5MRC'
[15:07] <Sytex> The freq will be 433.92
[15:07] <Sytex> It may change till tomorrow, but 99% it will stay this freq
[15:08] <Sytex> It will be release from Budapest
[15:08] <Sytex> The prediction is, it will fly northwards
[15:08] <daveake> from the top of the hill presumably?
[15:08] <daveake> lovely city
[15:08] <Sytex> From Technical University Budapest
[15:08] <mattbrejza> was a bit wet when i was there
[15:08] <daveake> ok
[15:08] <Sytex> Where the sat was built
[15:09] <Sytex> HA7WEN the the constructor of the sat's radio part built the payload.
[15:09] <Sytex> http://ha7wen.hu/beacon/tomeg.jpg
[15:09] <Sytex> http://ha7wen.hu/beacon/top.jpg
[15:10] <Sytex> It will transmit about 3 hours
[15:10] <Sytex> Today is 'wet' to, but weather forecast says sunny weather for tomorrow
[15:11] <Sytex> I will be there, and I will try to connect here from my phone. I will send here the exact freq and the 'lauch' success or not
[15:11] <Sytex> Almost forgot: at 14:30 Local time
[15:11] <mattbrejza> i was referring to when the river was in flood was when i was there
[15:12] <Sytex> mattbrejza: this year?
[15:12] <Sytex> sorry
[15:12] <Sytex> last year?
[15:12] <Sytex> around may or june?
[15:13] <mattbrejza> yea june
[15:13] <Sytex> that flood was terrible, lot of people worked at the river for days without sleep...
[15:14] <brainles71> Sytex: did you make that board?
[15:14] <Sytex> No: 16:09:30] < Sytex> | HA7WEN the the constructor of the sat's radio part built the payload.
[15:15] <brainles71> oh ok
[15:15] <mattbrejza> it didnt seem too bad in budapest, but i heard it was really quite bad in other regions
[15:15] <Sytex> mattbrejza: I work in Esztergom. Danube is two streets away from my workplace
[15:15] <Sytex> we 'lived' with sand-sacks
[15:16] <mattbrejza> ah
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[15:21] <mattbrejza> lucky the majority of budapest is a good distance higher than the banks of the river http://i.imgur.com/1NGNbq3.jpg
[15:21] <mattbrejza> btw what are these: http://imgur.com/mSp7GTX ?
[15:22] <Laurenceb> missile silos
[15:23] <Sytex> :D
[15:23] <Sytex> No
[15:24] <Sytex> I think there are... hardware stuff for services
[15:24] <Sytex> water company
[15:24] <Sytex> electric company
[15:24] <mattbrejza> oh ok
[15:25] <Sytex> But definietly not silos
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[15:27] <Sytex> brainles71: but if you have any question about the panel, tomorrow I will met Levente (HA7WEN) and I can ask him
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[15:28] <brainles71> nah nothing specific
[15:30] <brainles71> it looks like a bit of the frame work was done by hand though
[15:31] <brainles71> gotta love the dedication
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[15:34] <Sytex> I think is full homemade
[15:34] <Sytex> With toner-transfer I think
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[16:06] <Sytex> I totally forgot: As there will be no GPS on the baloon, any receive report will be good
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[16:07] <Sytex> You can send it to: gergely@bartanet.hu
[16:07] <Sytex> If someone receives it with directional antenna, please write us the dirrection too
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[16:20] <ibanezmatt13> Well, I had a 'meeting' today with a personal tutor. She said that as I only got 3 A*s at GCSE level and the rest As, I shouldn't waste my money on the oxbridge program or even any of the top universities. And that if I don't do any voluntary work between now and September my chances of getting in anywhere are slim. She can't be talking sense surely
[16:21] <jarod> http://www.youtube.com/watch?v=HPxUTk0z5dw - Shanghai Tower, China (650m)
[16:24] <aadamson> upuwork, if you have a min... Just wanting to bounce my understanding off you. thor16 is 15.625 baud right? or 0.064 (64ms) per bit, so timer1 IRQ which sets the tone should fire ever 64ms
[16:25] <aadamson> that 64ms is the effective length of a single tone, before a tone switch right?
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[16:30] <jarod> http://www.youtube.com/watch?v=gLDYtH1RH-U good audio version :/
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[16:32] <aadamson> curious how you determined that the per tone frequency is 15.625/2?
[16:33] <adamgreig> ibanezmatt13: waste your _money_ on the oxbridge program?
[16:33] <adamgreig> so far as I remember it doesn't cost money to apply to oxbridge
[16:34] <ibanezmatt13> It's just the funds for the college for the program I think
[16:34] <adamgreig> hm?
[16:34] <adamgreig> what program?
[16:34] <ibanezmatt13> I don't even know to be honest, it's a bit of a shambles
[16:35] <ibanezmatt13> I'm almost certain they're trying to stop me doing it, I seem to have stopped getting emails about it
[16:35] <mattbrejza> you have 5 choices, might as well put cam/ox down
[16:35] <adamgreig> if that's the type of person running the 'program' I wouldn't necessarily waste your _time_ attending it
[16:35] <adamgreig> you can apply to oxbridge with or without some program
[16:35] <adamgreig> you get to choose what unis you put on ucas
[16:35] <ibanezmatt13> yeah I thought that
[16:35] <adamgreig> as mattbrejza said you might as well put it down
[16:36] <adamgreig> GCSEs are important but not the be-all-and-end-all of grades
[16:36] <ibanezmatt13> She was a really horrible demoralizing thing. Apparently no one becomes rocket engineers with 3 A*s.
[16:37] <ibanezmatt13> She's probably mostly right but ah well. I just said to her, I'm going to do it and try and do well in the AS levels because I have nothing to loose. Then she replied "well I've said all I can, I guess it's up to you" in a really pessimistic way
[16:38] <adamgreig> haha, she sounds awful
[16:38] <daveake> I was encouraged to apply to Camb but decided not to
[16:38] <daveake> Don't see why she should discourage you
[16:38] <ibanezmatt13> But she's really got me worried now that I'm not doing enough. That I need to be doing voluntary work and all that lot.
[16:39] <daveake> Don't see how that helps
[16:39] <ibanezmatt13> Does a part time job at McDonald's really help with uni aplpications
[16:39] <daveake> Better to spend your time on HAB or rockets or something
[16:39] <craag> ^^ agreed
[16:39] <ibanezmatt13> That's what I thought but she said it was good, but not enough.
[16:40] <daveake> Every job I ever got was on the basis of stuff I was doing on my own in the evenings
[16:40] <craag> I took along an smpsu board that I'd built to my interviews. They seemed quite impressed by that.
[16:40] <daveake> :)
[16:41] <craag> Some of your hab stuff is many times better!
[16:41] <daveake> I reverse engineered the protocol for a CBM pen plotter and wired it to my Z80 machine. That got me one job.
[16:41] <ibanezmatt13> I met for the first time with my Uncle's best friend after he passed away recently who designs simulators for F1 teams and 3D modelled HOTOL at BAE. And he said what everyone says here
[16:42] <daveake> You just need the interviewer to ask "tell me about an interesting project you've done", then your eyes light up, you tell him all about it, and the job is yours
[16:42] <edjuh> where can I find information on the MONDO-F1 ?
[16:42] <daveake> what sort of info?
[16:43] <adamgreig> ibanezmatt13: yea it sounds like she might be only used to people applying for degrees in english at leeds or something, where maybe voluntary work would be a helpful thing to do?
[16:44] <adamgreig> but for engineering i'm pretty sure having spent time doing actual engineering is going to look an awful lot better than helping at a charity for a few weekends
[16:44] <edjuh> daveake: like when it will launch, and its contents ...
[16:44] <daveake> edjuh That balloon on spacenear.us is just a test
[16:44] <daveake> Project site is http://mickywoe.wix.com/bellomondo#!
[16:44] <edjuh> daveake: tnx
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[16:45] <ibanezmatt13> yeah adamgreig, may I ask, did you do any of that sort of stuff? Ie, part time jobs/ voluntary work etc?
[16:46] <daveake> Unless it's "I spent 8 weeks at a cat charity and designed 1mm^3 trackers and a tracking system for all the cats" it'd be a waste of time
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[16:46] <ibanezmatt13> lol
[16:48] <ibanezmatt13> I'm sure I could sort some sort of part time job out. But I wouldn't be able to revise as much for the AS exams. Though she did say "I know many students who can demonstrate they can work and revise at the same time." I mentioned the GAP year thing, a year in industry. She said I wouldn't get that either having done no work previously :P
[16:49] <ibanezmatt13> Eventually, I told her that I was doing it anyway regardless of what anybody said and walked away as politely as possible :)
[16:49] <daveake> The gap year thing is bollox
[16:49] <daveake> Actually I think it all is
[16:49] <adamgreig> ibanezmatt13: well like, I did duke of edinburgh gold
[16:50] <adamgreig> it got half a sentence on my personal statement
[16:50] <mattbrejza> http://www.youtube.com/watch?v=eKFjWR7X5dU
[16:50] <adamgreig> and mattered not really at all
[16:50] <adamgreig> compared to say, the robot I built for my A2 coursework
[16:50] <daveake> As my parents had little money, and my younger brother said he wanted to go to Uni too, I did a 1-3-1 to get some money
[16:51] <daveake> I'd say though that if that's not an issue, go straight to Uni so you don't get out of the studying habit
[16:51] <ibanezmatt13> ah I see. I guess it doesn't lessen my chances too much not doing anything. And I'm sure the Paddy power must count for something, surely.
[16:52] <adamgreig> no one really cares overmuch about volunteer work. working hard academically matters a lot more
[16:52] <adamgreig> which is really best predicted by GCSE and AS grades at application time
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[16:52] <adamgreig> so like, I would mostly be focused on getting the best possible AS grades
[16:52] <ibanezmatt13> yeah that seems logical. I'm sure my Dad and I can discuss this a little more down in Cambridge anyway over a coffee.
[16:53] <ibanezmatt13> Good news: Solidworks HAS ARRIVED! JUST! :D #SuperExcitement
[16:53] <adamgreig> as others have said in the past, there are other really good engineering unis beyond cambridge, too, so it's really not worth pinning everything on trying to get in to oxbridge
[16:53] <ibanezmatt13> yes of course.
[16:54] <adamgreig> cambridge is great if you mostly enjoy maths and theory and don't want to actually ever solder/rivet/weld/code anything :P
[16:54] <adamgreig> my entire productive output today was that I rearranged this one equation >_>
[16:54] <adamgreig> and when I say "I" I mean "MATLAB" really
[16:54] <daveake> haha
[16:54] <adamgreig> https://agg.io/u/rearrange.png
[16:54] <adamgreig> to be fair it was awful
[16:54] <mattbrejza> our department just bought some 3D printers, and you can pretty much use them for whatever you want
[16:54] <adamgreig> I tried to do it by hand and gave up >_>
[16:55] <adamgreig> oh well
[16:55] <adamgreig> time to go supervise some kids
[16:55] <adamgreig> bbl
[16:55] <daveake> Gawd, that looks like stuff a PhD colleague of mine comes up with
[16:55] <daveake> usually to describe something I thought would be simple :p
[16:56] <fsphil> it probably is simple
[16:56] <fsphil> maths people like to complicate things :)
[16:56] <daveake> I'm sure
[16:56] <daveake> Just not to me :)
[16:56] <Geoff-G8DHE> Two resistors in series ?
[16:56] <daveake> hah
[16:56] <ibanezmatt13> that looks bleeding awful!
[16:57] <daveake> Yeah that's an NTX2 frequency vs voltage plot
[16:57] <fsphil> it's probably the formula for cooking pizza
[16:57] <daveake> bistromatics
[16:57] <adamgreig> it's just like, the optimal combined reconstruction distortion you can achieve inside the el-gamal-cover simplified bound for quadratic gaussian sources when performing multiple description source coding
[16:57] <adamgreig> like fsphil says, simple
[16:57] <daveake> riiiight
[16:57] <daveake> :)
[16:57] <fsphil> tsh, don't see what all the fuss is about
[16:58] <daveake> that's because your mind blanked out all the words it didn't understand
[16:58] <fsphil> oh there where more words after the comma
[16:58] <daveake> Mine did too, leaving the comma
[16:58] <ibanezmatt13> I understand completely :P
[16:59] <daveake> I see you've added "how to lie convincingly" to your interview skills
[16:59] <ibanezmatt13> yes, very helpful :P
[16:59] <ibanezmatt13> Anyway, I have a Go Pro now :)
[16:59] <fsphil> I'm still confused at 2^0 == 1
[17:00] <ibanezmatt13> Donated to me buy this guy who makes simulators. We're gonna probably sack the Canon for the GoPro since he said if we loose it, he has another waiting. :/ I couldn't believe it
[17:01] <jededu> <ibanezmatt13> is it the black version
[17:01] <ibanezmatt13> I'm not sure which version, though he has many I believe from work
[17:02] <daveake> https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRw74XUV8fbjrum875cLa0KrUwVREGyDQIPnjvDxXm7IjOwjlmH
[17:03] <ibanezmatt13> :)
[17:03] <daveake> Yeah, the silver version is silver and black, as is the black version, and as indeed sis the white version
[17:03] <daveake> You need to look under the battery
[17:03] <ibanezmatt13> right. Which is the better one for HAB?
[17:04] <daveake> cheapest one
[17:04] <jededu> lol
[17:04] <ibanezmatt13> Oh right. Black, White or Silver, or whatever? :)
[17:04] <daveake> Don't remember
[17:04] <ibanezmatt13> I'll take a look.
[17:04] <daveake> Don't even know which one I've got as it was gifted to me
[17:05] <daveake> But if it has wifi turn that off - less power less heat
[17:05] <ibanezmatt13> yeah will do
[17:05] <daveake> Anyway cheap=good as you may lose it
[17:05] <daveake> especially if you don't bother chasing it <cuddykid> :/
[17:05] <ibanezmatt13> :)
[17:06] <ibanezmatt13> right tea, bbl. Thanks for the chat too
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[17:12] <jededu> daveake I managed to get a couple of the boards from upu :)
[17:13] <daveake> Oh, the Pi & Chips ones?
[17:13] <jededu> Yes thanks for the pointer
[17:13] <daveake> No problem; I'm good at sending people away to other people :p
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[17:15] <jededu> were they designed for v1
[17:16] <jededu> rev a
[17:16] <daveake> yes
[17:16] <daveake> problem?
[17:16] <daveake> shouldn't be
[17:16] <jededu> No its all good the pin connections match my sensors perfectly
[17:17] <daveake> ok
[17:17] <jededu> And matt helped with the software :)
[17:18] <daveake> Oh yeah, you used his s/w and asked me about an error?
[17:19] <jededu> i diddnt know who matt was then lol
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[17:54] <cm13g09> mfa298__: ping
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[18:00] <mikestir> bit breezy
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[18:13] <fsphil> just a bit
[18:13] <fsphil> I seem to be at the center of this storm, so probably not as bad here
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[19:12] <ottokleiber> good evening to all
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[19:14] <DL1SGP> hi ottokleiber
[19:15] <fsphil> evening!
[19:15] <ottokleiber> i am supposing the crazy weather means not much habs at the moment
[19:17] <fsphil> it's a bit nuts outside atm
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[19:25] <ottokleiber> shame. i hope no one is affected badly by it
[19:27] <fsphil> looks like Jade Rabbit is officially dead
[19:28] <mikestir> we're just in the red area on the met office map. some flickering lights earlier, but power still on
[19:29] <DL1SGP> mikestir: hope your power stays on :)
[19:30] <mikestir> the roof sounded like it was going to come off at work earlier
[19:31] <mikestir> it's a badly built modern steel frame building - you could feel it swaying
[19:31] <mikestir> and it's only 3 storeys high
[19:31] <daveake> right now it is :/
[19:31] <fsphil> I can feel my house shaking with some of the really bad gusts
[19:32] <mikestir> amazingly my HF antenna appears to still be up
[19:33] <fsphil> lol
[19:33] <fsphil> I'm watching mine right now
[19:33] <fsphil> probably shouldn't
[19:34] <DL1SGP> watching HF antennas in a storm can be thrilling, frustrating... but certainly is not recommended if trying to fall asleep :)
[19:35] <fsphil> thankfully it's due to start calming down now
[19:35] <DL1SGP> woot fsphil
[19:35] <mikestir> a tree branch landed in front of me when I was driving home
[19:35] <mikestir> luckily it was quite small and I was able to avoid it
[19:36] <fsphil> eek
[19:36] <fsphil> I'm surprised there are still trees left
[19:36] <fsphil> it's been windy since December
[19:39] <Gadget-Mac> mikestir: Trees coming down on the M6
[19:41] <Gadget-Mac> and most of the railway lines by the sound of it
[19:41] <fsphil> on the plus side, if the power does go out and my antenna is still up -- perfect timing for HF :)
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[19:51] <aadamson> ok, so anyone following the bouncing ball. I backed into the rest of the math on the si4463 when in 2mtr - 144mhz mode
[19:51] <aadamson> the min step size is 4.29hz
[19:52] <aadamson> and while it still doesn't meet the requirement for thor16 with a 27mhz osc
[19:52] <aadamson> that's ok, at least I know why it takes 3+ step size to make the right bandwidth... whew, that one had me going for a while
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[19:53] <aadamson> it's too bad that wds3 doesn't allow for smaller increments that .02khz and allow for other than the min of 25mhz for the cxo
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[19:55] <keydash> hi there
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[20:00] <hojo1690> aadamson, did I hear you mention something about messing with CW through an si4463? I'm interested in hacking some code together to do that with my pico board. Alternate between APRS and CW.
[20:02] <mfa298> cm13g09: pong (with a long rtt and from a different nick)
[20:03] <hojo1690> oops. should be on kd2eat... weird.
[20:03] hojo1690 (~mqh1spam@nat-128-84-124-0-370.cit.cornell.edu) left irc:
[20:03] <keydash> i'm struggling with neo 6m
[20:03] <keydash> sending the hex vector to flight mode
[20:03] kd2eat (~mqh1spam@nat-128-84-124-0-370.cit.cornell.edu) joined #highaltitude.
[20:03] <keydash> and on u-center i can see
[20:03] <keydash> ??:??:?? UBX CFG-NAV5, Size 44, 'Navigation 5'
[20:04] <keydash> and airbone actually changes, but i never get ack on the code (success)
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[20:11] <aadamson> if you are driving the 4463 with a micro controllable VCXO then all you need to do is set the tone on the input to the VCXO and then turn on and off the transmitter
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[20:12] <aadamson> ah, he left...
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[20:37] <kd2eat> aadamson... OK, thanks. That's what I thought, regarding CW. So, I would just use PWM to set a control voltage to get an acceptable frequency.
[20:38] <kd2eat> If I lock my VCXO at midline frequency (27 mhz in this case), will it just send dead carrier? The doppler guys would like me to send some dead carrier, as it's easier to RDF with doppler if there's no sound.
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[20:54] <SpeedEvil> Basically yes - if it's a simple FM TX
[21:00] <cm13g09> mfa298: latency was rather high
[21:00] <cm13g09> unfortunately I was buried in IOS at the time ;)
[21:00] <cm13g09> .win 25
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[21:05] <Lunar_Lander> hello
[21:06] <adwiens_KC0WYS> hi
[21:08] <aadamson> kd2eat, yes, if you don't modulate the pwm, which is running at 31.25khz wtih any tone, all you'll do it just send an FM carrier with no audio. If you send put a tone on the PWM (the afsk stuff uses a 1200 and 2200 and you can just set one or the other pretty easily if you wanted, you's send 1200 or 2200hz audio over that FM carrier
[21:09] <aadamson> oh and because the 31.25khz pwm is running at 50% duty cycle, it already is centered at 3v3/2 so you don't pull the vcxo either direction (other than the delta that may exist because of use of 1% resistors in the voltage divider that the pwm goes through - it's DC coupled
[21:11] <aadamson> which is why thomas suggested that if you adjust the mid point of the PWM, you can in effect adjust the vcxo frequency which in turn will adjust the carrier frequency - which will allow you to make up for those 1% resistors :)
[21:12] <aadamson> now if I could just make my fingers work... it's just to dang cold in atlanta today! :
[21:12] <aadamson> :)
[21:14] <kd2eat> lol
[21:14] <kd2eat> Awesome, thanks for the great explanation.
[21:15] <kd2eat> I finally fixed my one board that was off-frequency by rooting through my 10K resistors until I had two that were reading exactly the same on my meter, and swapping those in for the voltage divider.
[21:16] <aadamson> yeah I should fix both of mine too, but I just use them for testing and so I just know it's 3.5khz off :)
[21:16] <aadamson> low
[21:16] <kd2eat> heh
[21:17] <kd2eat> I picked up some 0.1% resistors for next time. Hopefully I won't have to sort through so many to find a match.
[21:17] <aadamson> hehe... ya
[21:17] <kd2eat> I'm still struggling with my GPS chips not locking on. I just put together a I2C logic leveler yesterday. Tonight's project is to wire up the pico to an arduino and write debugs out so I can see the GPS strings.
[21:18] <kd2eat> Pico's at 3.3v The Arduino is at 5.
[21:18] <aadamson> yep
[21:18] <aadamson> and the gps is probably a 3v3 volt variant as well
[21:20] <kd2eat> Yes, it is.
[21:20] <kd2eat> Looking forward to finally sorting this issue out. It's the last one on a long road.
[21:20] <kd2eat> (I HOPE!!!!)
[21:22] <DL1SGP1> fingers crossed kd2eat :)
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[21:23] <kd2eat> Thanks :-)
[21:23] <kd2eat> It shouldn't be THIS hard, but on the other hand, I wouldn't be learning so much if it was easy.
[21:23] <kd2eat> I'm one of those guys who LIKES doing things the hard way. I should be darn cheerful about all this! lol
[21:24] <DL1SGP1> yeah, that is the difference between homebrewing and consumer electronics, for things that you do on your own you have double benefit, on the one hand you save some money, on the other you gain experience whcih can be applied to other sectors or further projects later on
[21:24] <kd2eat> Oh ya!
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[21:37] <KiwiDean> While on the topic of GPS and I2C, I'm wondering how people work around the lack of clock stretching when using a RaspberryPi with uBLOX MAX-7Q. Do they simply set the I2C clock slower? If so how slow do you need to go?
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[21:38] <kd2eat> Haven't done anything with Raspberry and GPS yet, sorry.
[21:38] <KiwiDean> No worries kd2eat, just thought there might be others out there who have :-)
[21:39] <jcoxon> KiwiDean, you need to chat to daveake
[21:39] <craag> KiwiDean: People use software I2C on the pi
[21:39] <craag> It works a lot bettr
[21:39] <craag> daveake does too
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[21:42] <KiwiDean> Thanks guys, busy googling for I2C software implementations for the Pi now.
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[21:56] <daveake> There's info about the issue at http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=13771 and https://dl.dropboxusercontent.com/u/3669512/2835_I2C%20interface.pdf
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[22:44] <KiwiDean> Thanks Dave :-)
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[22:47] <KiwiDean> I also came across this http://www.raspberrypi.org/phpBB3/viewtopic.php?t=40743, next step is to order a uBLOX from UPU and get experimenting.
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[23:17] <aadamson> so just curious, why all this interest in i2c to talk to the gps? Just because the avr's are so limited with serial ports?
[23:19] <mikestir> I think it's more for the pi
[23:19] <mikestir> on the avr it's easy to bit bang the serial for rtty to free up the uart for the gps
[23:19] <aadamson> is the Pi serial port limited too?
[23:20] <aadamson> yeah thats what I would have thought on the AVR as well.. use soft serial if wanted
[23:20] <mikestir> people seem to use the serial for the rtty on the Pi because getting accurate enough timing for software serial would require a kernel module
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[23:20] <aadamson> It looks like there might be one advantage, the ublox can deliver data in non-nmea over spi and or i2c
[23:20] <mikestir> which I'm actually kind of surprised no one has written
[23:20] <mikestir> it can deliver it in ubx over serial as well
[23:22] <chris_99> surpised noone has written what?
[23:23] <mikestir> kernel module for 50 baud software serial on the pi
[23:23] <chris_99> you can easily do serial on the pi
[23:23] <craag> mfa298 has done some work on that
[23:23] <chris_99> or am i misunderstanding what you mean
[23:23] <mikestir> aadamson was asking about the interest in i2c for talking to the ublox on the pi
[23:23] <mikestir> it's because people use the hard serial for the rtty
[23:24] <mikestir> and there's only one port brought out
[23:24] <mikestir> whereas on the arduino, which also has 1 serial port, it's easier to write an accurately timed soft-serial implementation
[23:25] <aadamson> and on the stm, you just use another hardware serial port :)
[23:25] <mikestir> indeed
[23:25] <mikestir> or even on avr
[23:25] <aadamson> yea with the right avr, indeed
[23:25] <mikestir> it's just the low-end AVRs seem to be favoured
[23:25] <aadamson> the 328's alittle limited, but the megas wold be fine
[23:26] <aadamson> oh, well, I just saw the comments and puzzled the *why*
[23:26] <mikestir> which stm are you using? I recently noticed they have an M0+ range now
[23:26] <mikestir> I have been looking at freescale's M0+ devices
[23:27] <aadamson> F1, 2, 3, 4's... I'm thinking of playing with a f0 too
[23:27] <aadamson> actually pretty much gave up on the f2, the f3 is much more flexible and has a newer peripheral core
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[23:29] <mikestir> I think I have a freebie kinetis board coming to me at work tomorrow
[23:29] <mikestir> I'll need to compare it with the stm f0
[23:29] <mikestir> the highlights for the f0 seem to imply it has sub uA sleep, which would be better than the freescale I think
[23:30] <aadamson> yeah, I need a good 1.8-2v buck/boost design, anyone got one that they'd share?
[23:30] <aadamson> I'm curious of playing with an F0 at 2v
[23:31] <mfa298> chris_99: the issue is that you ideally want a uart for the GPS and uart for rtty, the Pi only has one accessible UART
[23:31] <chris_99> oh gotcha
[23:32] <mfa298> on avr's you can do pretty decent timing so you can easily bit bang rtty with either a busy loop or interupt. On the Pi that get's harder as the OS gets in the way meaning timing isn't as accurate
[23:32] <mikestir> aadamson: there are a few TI ones e.g. tps61020
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[23:32] <aadamson> yeah, just looking at the ltc3526 as well
[23:33] <aadamson> must be pretty easy with a reference design maybe
[23:33] <mikestir> it's all in there apart from the inductor. they run at about a meg so you just need to keep the layout compact and well grounded
[23:35] <mikestir> and ceramic caps
[23:35] <mfa298> You can bitbang rtty on the pi from userspace but you need to give the thread a realtime schedule and increase it's priority - which probably means C/C++ code.
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[00:00] --- Thu Feb 13 2014