highaltitude.log.20101019

[00:05] <Laurenceb> http://pastebin.com/0M1ivYPp
[00:05] <Laurenceb> can someone help me work out a bug
[00:05] <SpeedEvil> ?
[00:06] <Laurenceb> case 't': causes the program to rn really slowly
[00:06] <Laurenceb> it seems to talk to the cc1020 ok
[00:06] <Laurenceb> and retunes it etc
[00:06] <SpeedEvil> This is what?
[00:06] <SpeedEvil> the proc
[00:06] <Laurenceb> but after that the while loop is running at about 20hz or lesss
[00:06] <Laurenceb> avr
[00:07] <SpeedEvil> hmm
[00:07] <Laurenceb> i cant see what could be slowing it down
[00:07] <SpeedEvil> I'd start by looking at the generated code.
[00:08] <SpeedEvil> Sorry - nothing clear is popping out - going to sleep. Good luck!
[00:11] <Laurenceb> cya
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[00:31] <SpeedEvil> http://www.dealextreme.com/details.dx/sku.48365 - not getting to sleep
[00:31] <SpeedEvil> Cheeeeeep GPS tracker/GSM
[00:33] <natrium42> SpeedEvil, see the user comments though
[00:33] <natrium42> under "Which GPS Chipset?"
[00:34] <SpeedEvil> oops
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[00:35] <SpeedEvil> Well - the box shot sorta implies GPS
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[02:03] <Darkside> hey juxta|console
[02:03] <Darkside> my amp is running
[02:04] <Darkside> i can pick it up on 7MHz
[02:04] <Darkside> and 14
[02:04] <Darkside> in fact, at most of the harmonics >_>
[02:04] <Darkside> then again, i am right next to it
[02:04] <Darkside> and i dont think this box has very good RF shielding...
[02:05] <juxta|console> haha
[02:06] <juxta|console> how's the power?:)
[02:06] <Darkside> 770mW atm
[02:06] <Darkside> havent been able to get it higher than that yet
[02:06] <Darkside> if i'm a bit less, uh, stringent with the filters i could go higher
[02:06] <Darkside> a lot higher
[02:07] <Darkside> also thi sis into a dummy load
[02:07] <Darkside> if i was transmitting into a tuned antenna, it would be much better
[02:07] <Darkside> the harmonics would be attenuated much more
[02:07] <juxta|console> nice work :)
[02:08] <juxta|console> what do you figure you need for skywave?
[02:08] <juxta|console> 5W?
[02:09] <Darkside> i'd like 5W
[02:09] <Darkside> i think my other problems here are because of the RF chokes i'm using
[02:09] <Darkside> which are bad
[02:09] <Darkside> i shoul dbe using iron powder toroids
[02:11] <juxta|console> hm, speaking of RF
[02:11] <juxta|console> we made up and tuned some of those zep antennas we have on the repeaterlast night
[02:11] <juxta|console> they're a huge pain to tune
[02:15] <Darkside> heh
[02:15] <Darkside> a dipole would be simpler :P
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[02:35] <Jack___> Hello, if anybody is up an about, I would like to ask a question.
[02:35] <Jack___> I am working on a research project with a low-altitude tethered weather balloon. The payload (including the line) is about 300 grams. The balloon will reach a maximum height of 200 meters before we bring it back down. What size balloon should we buy and how much helium will it take to fill this balloon each time?
[02:36] <juxta|console> hey Jack___, if you're only going to 200m with a 300g payload, you wont need much of a balloon
[02:36] <Jack___> I called a supplier this afternoon, and the man said I would need a 9 foot diameter balloon.
[02:37] <juxta|console> you might be able to get away with even a 4 or 5 foot party balloon
[02:37] <kd0mto> For 300 grams?
[02:37] <Jack___> Yes.
[02:37] <kd0mto> Jack___: You could just use multiple party balloons.
[02:37] <Jack___> I was doubtful... considering he told me the same thing when my payload was a pound.
[02:37] <Jack___> That would be cheaper and easier.
[02:38] <juxta|console> a 4 foot balloon filled will give you closeto 1kg of lift
[02:38] <juxta|console> so subtract the weight of the balloon itself plus the payload and you'll still have lots of free lift
[02:38] <kd0mto> juxta|console: So he should shop for a 300 g or a 600 g balloon then?
[02:38] <Jack___> Ah. That is exactly what I needed to know.
[02:38] <juxta|console> even less than that
[02:38] <juxta|console> even a 100g balloon would be plenty
[02:38] Action: kd0mto see's a pretty cheap flight
[02:39] <juxta|console> even a 50g balloon would be fine
[02:39] <Darkside> juxta|console: what did you have above the science alive stall?
[02:39] <juxta|console> that was a 500g I think
[02:39] <Jack___> I could calculate exactly what size I need, but I don't know the pressure inside one of these balloons...
[02:39] <kd0mto> I know for our teathered flights we use a least 1000 g balloon, but then again we had 2 very heavy camera's and an onboard computer.
[02:39] <juxta|console> but we flew a 100g balloon to over 10km with a 400g payload before
[02:40] <juxta|console> http://projecthorus.org/?page_id=1021 - 100g balloon, 14km altitude
[02:40] <juxta|console> higher than I had expected to be honest
[02:41] <Jack___> Hey, this is very similar to what I am doing!
[02:41] <Jack___> Hmmm
[02:41] <juxta|console> don't forget the weight of your tether line though Jack___
[02:42] <shenki> juxta|console: the launch and landing date appears to have an off by one error
[02:42] <Jack___> The sensor unit is 130 grams and I am budgeting for 300 grams total.
[02:42] <shenki> juxta|console: in the month field
[02:42] <shenki> juxta|console: (for horus 8)
[02:42] <Jack___> I am going to buy high tensile kite string.
[02:42] <juxta|console> oh, thanks shenki
[02:42] <juxta|console> will fix it
[02:43] <juxta|console> Jack___: have a look here: http://www.kaymont.com/pages/pilot-ceiling-balloons.cfm
[02:43] <juxta|console> what you're interested in is bursting diameter
[02:43] <juxta|console> don't worry about the rest
[02:43] <juxta|console> take that bursting diameter and calculate the volume of a sphere with that diameter
[02:44] <juxta|console> the rough rule thumb is slightly less than 1kg of lift per cubic meter of helium/hydrogen
[02:45] <Jack___> hmmmm
[02:46] <juxta|console> as you're only going up 200m you won't need to account for change in air pressure & hence expansion of the balloon
[02:46] <juxta|console> a 100g balloon would comfortably do what you want :)
[02:46] <Jack___> 4/3*3.1459*.196^3=.822 cubic meters
[02:46] <Jack___> ...
[02:46] <juxta|console> (and i think they're about 5-10 bucks from kaymont
[02:46] <juxta|console> )
[02:47] <juxta|console> http://www.wolframalpha.com/input/?i=volume+of+a+196cm+sphere ;p
[02:47] <Jack___> haha
[02:47] <Jack___> ok
[02:47] <Jack___> about one kg-force of lift
[02:48] <juxta|console> if you get a 100g balloon and just put 1 cubic m of helium in, you'll be fine
[02:48] <Jack___> So this assumes that the buoyant force is the same all the way up to bursting.
[02:48] <Jack___> That would make sense...
[02:49] <Jack___> ok
[02:49] <juxta|console> if you're only going up 200m and the balloon isnt in the sun for too long, you can probably even re-use it a few times
[02:49] <Jack___> that is the plan
[02:49] <Jack___> are these balloons sensitive to sunlight?
[02:49] <Jack___> although at $5-10 I am not too concerned.
[02:50] <juxta|console> yeah, they're untreated latex
[02:50] <juxta|console> 12 hours in the sun will take it's toll on them
[02:50] <Jack___> OK, I will be sure to buy extras then. Thank you.
[02:50] <Jack___> one last question
[02:51] <Jack___> they sell helium by the pound/kilogram, right?
[02:51] <Jack___> how much do I need to fill one of these 100 gram balloons up?
[02:56] <juxta|console> generally it comes in standarised cylinder sizes
[02:56] <juxta|console> the size we usually buy is 3.4 cubic m, but that's more than you'd need - I'd say bargain on 0.6-1.0 cubic m for your needs
[02:57] <juxta|console> it's cheaper in bulk of course
[02:57] <juxta|console> where are you located Jack___?
[02:57] <Jack___> Boston in the States
[02:58] <juxta|console> ok, helium should be fairly cheap then :)
[02:58] <juxta|console> for the next few years at least, hehe
[02:58] <Jack___> haha
[02:58] <juxta|console> i pay $180 AUD for 3.4 cubic m usually
[02:59] <juxta|console> 1AUD = .98USD atm
[02:59] <juxta|console> it's probably much cheaper over there though
[02:59] <Jack___> It will be on a university expense account, so we can probably get a good deal
[02:59] <Jack___> we'll see
[02:59] <Jack___> OK!
[03:00] <juxta|console> what's in your payload by the way? :)
[03:00] <Jack___> 100 gram balloon, bank on buying about 1 cubic meter of helium
[03:00] <Jack___> a temperature sensor
[03:00] <Jack___> I spent all summer building the system. It was fun.
[03:00] <Jack___> It measures temperature and relays the signal down to a hand-held unit.
[03:00] <juxta|console> cool - which university are you at?
[03:01] <Jack___> We are using it to (hopefully) predict air pollutant dispersion
[03:01] <Jack___> Tufts University
[03:01] <juxta|console> ah right - I ask as there are a few guys from MIT who've done launches, they may be able to help you out with supplies
[03:03] <Jack___> That is a couple subway stops away, but I think I have everything figured out for the time being
[03:03] <Jack___> Thanks for your help!
[03:03] <juxta|console> no worries :)
[03:04] <juxta|console> by the way... what time is it over there? :S
[03:04] <Jack___> 11 pm
[03:04] <juxta|console> oh, righto
[03:04] <juxta|console> I imagined some ungodly hours
[03:04] <juxta|console> ;p
[03:04] <Jack___> time to start homework in my case...
[03:05] <Jack___> X-(
[03:07] <juxta|console> alrighty - good luck with the project :)
[03:08] <juxta|console> Darkside: i think that aprs beacon is configured for 5w or more
[03:09] <juxta|console> in other words, i'm not putting it in the same box as my payload :)
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[03:43] <Darkside> juxta|console: haha
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[04:05] <shenki> Darkside: what do you think of these for my remote humidity sensor project: http://www.sparkfun.com/commerce/product_info.php?products_id=8946
[04:05] <shenki> Darkside: would there be a way to boost the range above 500ft?
[04:06] <Darkside> uhmm
[04:06] <Darkside> probably not easily
[04:07] <shenki> they suggest a 30-35cm length of wire, that's a half-dipole for 434MHz, yeah?
[04:08] <shenki> are you better off with a full dipole antenna?
[04:08] Action: shenki exposes his RF ignorance
[04:09] <Darkside> uhmm
[04:09] <Darkside> no
[04:09] <shenki> can you explain why?
[04:09] <Darkside> well, it depends on the output impedance
[04:09] <Darkside> but you can easilt wire up a monopole antenna
[04:10] <Darkside> which will be 17cm
[04:10] <shenki> does it depend on LOS?
[04:10] <Darkside> eh
[04:11] <Darkside> a monopole antenna is probably the best you'll be able to do easily
[04:12] <shenki> ok
[04:12] <shenki> does it need line of sight?
[04:12] <Darkside> it would help
[04:13] <Darkside> if you have LOS it will make things a lot easier
[04:13] <shenki> ok
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[05:06] <kd0mto> holy crap this DSP class is hard.
[05:06] <kd0mto> Who was working on making the SDR?
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[06:56] <juxta> hey shenki
[06:56] <juxta> i have some of those modules
[06:56] <juxta> they're a bit erm
[06:56] <juxta> crappy, to be honest ;p
[06:57] <juxta> anyway, if you want to try them I can give you a set
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[07:08] <Darkside> lol
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[08:47] <Darkside> hmm
[08:47] <Darkside> dl-fldigi fails to build in ubuntu too
[08:49] <shenki> Darkside: how are you trying to build it?
[08:50] <Darkside> http://slexy.org/view/s20cGoWF3i
[08:50] <Darkside> thats after configure finished successfuly
[08:50] <Darkside> it seems to be trying to move something that doesnt exist
[08:50] <SpeedEvil> kd0fxp: laurenceb
[08:51] <Darkside> this is on an ubuntu vm
[08:52] Action: shenki gives it a go on his system
[08:53] <shenki> Darkside: you just checked it out from git?
[08:55] <shenki> Darkside: latest version from git wfm
[08:59] <Darkside> yeah
[08:59] <Darkside> hmm
[08:59] <Darkside> i duno whats going on
[09:00] <shenki> it built and runs for me
[09:00] <shenki> try doing 'apt-get build-dep fldigi'
[09:00] <shenki> there might be some dependancy that configure doesn't check for that you need
[09:00] <Darkside> yeah
[09:00] <Darkside> i think there might be
[09:00] <Darkside> oh wow
[09:01] <Darkside> w00
[09:01] <shenki> otherwise i can just send you my binary
[09:01] <Darkside> now its compiling
[09:01] <Darkside> nah
[09:01] <shenki> it appears that it's static enough to copy over
[09:01] <shenki> ok
[09:01] <Darkside> im going to make some mods
[09:02] <Darkside> like add in higher baud RTTY
[09:02] <Darkside> so i can try out 600 baud RTTY
[09:02] <shenki> so this is the program you use when uploading telemetry?
[09:02] <shenki> heh, hows your C++?
[09:02] <Darkside> when receiving it, yes
[09:02] <Darkside> i have to change 2 arrays
[09:02] <shenki> sounds easy
[09:02] <shenki> good luck
[09:03] <shenki> Darkside: which licence are you planning on going for? standard or advanced?
[09:03] <Darkside> advanced
[09:08] <shenki> ok
[09:08] <shenki> Darkside: guess what today is?
[09:10] <Darkside> no idea
[09:10] <Darkside> what is today
[09:10] <shenki> Darkside: 30 days to go :D
[09:11] <Darkside> heh
[09:11] <Darkside> oh yes
[09:11] <Darkside> this is the day of our last exam
[09:11] <Darkside> oh man
[09:12] <SpeedEvil> Good luck.
[09:12] <SpeedEvil> What's it in?
[09:12] <shenki> bachelor of electrical and electronic engineering
[09:12] <Darkside> advanced telecomms i think
[09:12] <Darkside> oh
[09:12] <Darkside> :P
[09:12] <shenki> oh, the last exam? yeah, advanced tele
[09:13] <SpeedEvil> The last exam is the post mortem.
[09:13] <SpeedEvil> And you don't need to study for that!
[09:13] <Darkside> lol
[09:13] <Darkside> hmm wheres the gui stuff in fldigi
[09:14] <Darkside> and where is the other place i add rtty modes
[09:19] <Darkside> shenki: how can i search through these source files for a line?
[09:24] <jonsowman> grep <string> <file>
[09:28] <jonsowman> `man grep` if that's not enough detail :P
[09:29] <Darkside> heh
[09:29] <Darkside> it doesnt help much
[09:29] <Darkside> im really not sure wht i'm looking for
[09:29] <Darkside> i'll ask fsphil when he's online
[09:30] <shenki> Darkside: sorry, what do you want to do?
[09:30] <Darkside> nvm i found it
[09:30] <Darkside> its in the 200kb c++ file...
[09:30] <shenki> :D
[09:30] <Darkside> well, i think so
[09:34] <plantain> Darkside: check the flying roster :D
[09:34] <Darkside> i saw it yesterday
[09:34] <Darkside> wait
[09:34] <Darkside> this morning
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[10:53] <Laurenceb_> hi
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[12:13] <Laurenceb_> anyone here used elmer?
[12:16] <Darkside> >_>
[12:16] <Darkside> never heard of it
[12:16] <Darkside> Laurenceb_: was it you who was messing about with higher RTTY baud rates in fldigi?
[12:16] <Darkside> or was that someone else..
[12:16] <SpeedEvil> I assume you mean the ham-related software package.
[12:16] <SpeedEvil> I have not.
[12:16] <Darkside> i'm trying to work out how to include the higher baud rates in fldigi
[12:17] <Laurenceb_> the iussue is that it doesnt let you have custom baud rates
[12:17] <Darkside> yeah
[12:18] <Laurenceb_> youd need to find the code and recomile it
[12:18] <Darkside> i'm happy with just adding 600 baud though
[12:18] <Darkside> i found a few places where it was
[12:18] <Laurenceb_> you can hack it by feeding in a wav stream
[12:18] <Laurenceb_> with higher sample rate
[12:18] <Laurenceb_> and itll assume its 8ksps
[12:18] <Laurenceb_> but you need to fix the timing on the decoders
[12:18] <Darkside> say i just want 600 baud
[12:18] <Laurenceb_> or feed it a weird baud rate from the transmitter
[12:18] <Laurenceb_> that would work
[12:18] <Darkside> i found a few places where it is
[12:19] <Darkside> such as in the gui config file, and the rtty.h
[12:19] <Darkside> i changed all of them, recompiled, and it still didn't show up
[12:19] <Laurenceb_> it may be easiest to retime your transmitter
[12:19] <Laurenceb_> and send it a wav stream
[12:20] <Laurenceb_> you might need to write some of your own code using libsamplerate to resample the audio to get the timing to work
[12:20] <Laurenceb_> id need to work it out properly
[12:20] <Darkside> with 8ksps 600 baud should work
[12:20] <Darkside> 1200 probably wont
[12:21] <Darkside> i think it was fsphil that got it to work
[12:21] <Darkside> might ask him for his code
[12:21] <Laurenceb_> whats thye max baud in fldigi?
[12:21] <Darkside> maybe it can be merged into dl-fldigi, for testing higher baud rates
[12:21] <Darkside> 300
[12:21] <Darkside> i think fsphil said he had 600 working fine
[12:21] <Laurenceb_> yeah ok, so you want 1200
[12:21] <Darkside> but 1200 wouldnt work
[12:21] <Laurenceb_> 4 times that
[12:21] <Laurenceb_> so... feed it 32ksps
[12:22] <Darkside> fldigi can decode 600 baud with 8ksps tho
[12:22] <Laurenceb_> oh ok you just need 16ksps then
[12:23] <Laurenceb_> audio from sound card-> c code using libsamplerate to 16ksps-> pipe -> fldigi
[12:23] <Laurenceb_> then 600baud on your menu will actually be 1200baud
[12:24] <Darkside> or you hack fldigi to allow higher sample rates for some modes
[12:24] <Darkside> i.e RTTY, as you don't need to re-tune the filters
[12:24] <Darkside> everything else won't work with a higher sample rate tho
[12:24] <Laurenceb_> yes, thats the neatest way to do it, but the source code is rather horrendous
[12:24] <Darkside> yeah, i know >_>
[12:24] <Laurenceb_> fsphil seems to be familiar with it
[12:24] <Darkside> i like my RTTY code :P
[12:25] <Darkside> AD9835_SetFreq(7000000);
[12:25] <Laurenceb_> SpeedEvil: elmer = GPL multiphysics
[12:25] <SpeedEvil> ah
[12:25] <Darkside> AD9835_SetFreq(7000425)
[12:25] <Laurenceb_> hah
[12:25] <Laurenceb_> thats a frequency generator?
[12:25] <Darkside> well, i actually set two frequency registers up, then flick between them really wuickly
[12:25] <Darkside> i have a AD9835 DDS chip
[12:25] <Darkside> works wonders
[12:26] <Laurenceb_> sounds similar to my cc1020 - looks like thats what im doing wrong
[12:26] <Darkside> well this is just a DDS, not a SDR
[12:26] <Laurenceb_> i was just calling the setup function each time i want to retune
[12:26] <Darkside> and its HF only
[12:26] <Laurenceb_> i should setup the new frequency in a second frequency register
[12:26] <Darkside> i wouldn't use it anywhere above about 14MHz
[12:26] <Laurenceb_> then setup that register as the one to be used
[12:27] <Darkside> http://www.analog.com/static/imported-files/data_sheets/AD9835.pdf
[12:27] <Darkside> on the AD9835 there's a pin to do that :P
[12:27] <Darkside> i can program in the frequencies, then send serial data to the pin
[12:28] <Darkside> i could do that using a UART, but i'm doing it manually at the moment, since it works
[12:28] <Darkside> also i can reprogram the frequency register at up to 7500 times per second, so i have a symbol rate limit of 7500 baud
[12:36] Action: SpeedEvil wishes there was a nice way to GPS discipline those.
[12:36] <Darkside> ?
[12:36] <SpeedEvil> I'd love a DDS chip which had a seperate register.
[12:37] <Darkside> you mean calibrate the output?
[12:37] <SpeedEvil> Which timed according to the DDS clock an input pulse.
[12:37] <SpeedEvil> So you could feed in a 1pps GPS pulse.
[12:37] <Darkside> just use a TCXO if you want ridiculous levels of frequency stability
[12:37] <SpeedEvil> And then read back the time it occurred, and correct the timebase.
[12:37] <SpeedEvil> I want insane, not ridiculous.
[12:37] <Darkside> pff
[12:37] <SpeedEvil> ;)
[12:38] <Darkside> TCXO will get better than gps im sure
[12:38] <SpeedEvil> I was wondering about phase coherent.
[12:38] <Darkside> it is
[12:38] <SpeedEvil> GPS will do +-1ns in good conditions.
[12:38] <Darkside> as you change registers it is coherent phase
[12:38] <SpeedEvil> over long periods
[12:38] <Darkside> no idea about that, i'm using FSK in my application so i don't care
[12:39] <Darkside> i only care about frequency stability, and the stock oscillator on the sparkfun breakout only drifts 300Hz at -40 degrees C
[12:39] <Darkside> and thats perfectly acceptable yo me
[12:40] <SpeedEvil> Basically - if you lock in the frequency to within .001Hz - then you can do interesting things on reception of signals way below the noise.
[12:40] <Darkside> i.e. WSPR
[12:40] <Darkside> the AD9835 only does 0.013Hz precision i believe
[12:40] <Darkside> but i've seen examples of it being used as a WSPR beacon
[12:41] <Darkside> actually that was using an AD9834, and they have even less frequency precision than the AD9835
[12:43] <Darkside> i still need to write some WSPR code... I thought i'd wait until i actually have my amateur license so i can test it properly
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[13:22] <Darkside> juxta|console: about?
[13:22] <Darkside> juxta:
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[14:18] <russss> this is cheaper than I remember http://www.globalstareurope.com/en/content.php?cid=204
[14:20] <russss> although "Bundled voice and data pricing do not apply while roaming"...
[14:27] <m1x10> Hi
[14:27] <m1x10> is it expensive to send an sms to another country?
[14:43] <SpeedEvil> Not very typically.
[14:43] <SpeedEvil> Dependant significantly on your contract/plan
[14:54] Nick change: lovelace- -> lovelace
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[15:13] <russss> so we've been discussing satellite data on the hackspace mailing list
[15:13] <russss> we found this: http://www.digi.com/products/wireless/satellite/m10.jsp
[15:14] <russss> global satellite burst data coverage "All at a typical low monthly cost comparable to cellular plans for low data volume M2M applications"
[15:14] <russss> uses this satellite network: http://en.wikipedia.org/wiki/Orbcomm
[15:15] <SpeedEvil> How much?
[15:15] <russss> well, I can't find any prices
[15:15] <russss> so that's all I have to go on
[15:16] <m1x10> SpeedEvil do u want to sms me ?
[15:16] <m1x10> if its not too much for u
[15:17] <m1x10> you will actually sms the backup system
[15:17] <m1x10> and get back my position
[15:17] <SpeedEvil> where are you?
[15:17] <m1x10> but im not sure if It has credit to send to other country
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[15:18] <m1x10> GR
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[15:20] <SpeedEvil> pm number
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[15:22] <m1x10> just send an empty text
[15:37] Nick change: johnny5 -> johnny5ive
[15:43] <W0OTM> hello
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[17:38] <Upu> ping jonsowman
[17:38] <Upu> duh sorry
[17:38] <Upu> wrong person
[17:38] <Upu> jcoxon isnt' here
[17:39] <Upu> fsphil
[17:39] <Upu> http://www.youtube.com/watch?v=ptSeH6F3VEo
[17:40] <jonsowman> :)
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[17:46] <fsphil> evening
[17:47] <jonsowman> help
[17:47] <jonsowman> oops
[17:47] <jonsowman> wrong window :)
[17:48] <fsphil> Upu, brilliant! nice clean cut too - I expected it to burn
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[17:50] <Upu> no smoke
[17:50] <Upu> just went
[17:50] <Upu> need to try it with less weight
[17:51] <Upu> But I suspect with the balloon going up and the payload wanting to come down there should be enough going on to break it
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[17:51] <Upu> bit too complex though I had 2 springs from some pens in there providing some tension but don't think it needs it
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[17:52] <Laurenceb> hi
[17:54] <jcoxon> evening all
[17:56] <jonsowman> evening jcoxon
[17:57] <Upu> hey jcoxon
[17:57] <Upu> [18:39] <Upu> http://www.youtube.com/watch?v=ptSeH6F3VEo
[17:57] <jcoxon> ooo cool
[17:57] <jcoxon> good work
[17:57] <jcoxon> what voltage?
[17:57] <Upu> good question not sure
[17:57] <Upu> not alot
[17:58] <jcoxon> cool
[17:58] <Upu> battery levels
[17:58] <jcoxon> no harm in seperate power supply
[17:58] <Upu> http://www.youtube.com/watch?v=Kmf-xIO7qZ8
[17:58] <Upu> however... that looks more
[17:58] <Upu> "Desisive" :)
[17:58] <Upu> however you spell it
[17:58] <jcoxon> haha
[17:59] <jcoxon> decisive
[17:59] <Upu> yes
[17:59] <Upu> anyway will keep playing needs to be simpler
[17:59] <jcoxon> great
[18:07] <jcoxon> so i've nearly got sunrise and sunset working
[18:07] <jcoxon> can i run javascript via the command line?
[18:07] <jcoxon> like php?
[18:07] <Upu> think so just type java blah.jar
[18:09] <fsphil> java != javascript :p
[18:09] <Upu> all java to me :)
[18:09] Action: Laurenceb is very confused by python and or avr c
[18:09] Action: Upu goes and sits in a corner
[18:10] <fsphil> other than name they've really no relation at all
[18:10] <fsphil> it's very confusing
[18:10] <Laurenceb> http://pastebin.com/7uAZ2HF9
[18:10] <jcoxon> its just its a pain to debug remotely
[18:11] <Laurenceb> wherever i enter 's' its as if the avr is being set s characters constantly
[18:11] <fsphil> you can open it locally in firefox
[18:11] <Laurenceb> http://pastebin.com/WTsHiq1N
[18:11] <Laurenceb> thats the avr code
[18:12] <Laurenceb> if i send 's' from the terminal running python the main loop in the avr program slows down to 10hz
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[18:14] <Laurenceb> as if its being sent s characters constantly
[18:14] <natrium42> ello aurenceb
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[18:17] <natrium42> did hadie really launch 16-17th?
[18:17] <jcoxon> nope
[18:18] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[18:18] Topic changed on #highaltitude by jcoxon!jcoxon@cpc1-lanc4-0-0-cust720.3-3.cable.virginmedia.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk
[18:18] <natrium42> /D:\
[18:18] <fsphil> :(
[18:18] <fsphil> it will next time ... ocean landing or not ;)
[18:19] <natrium42> do you have a chase boat?
[18:19] <fsphil> nah - but I'll make another payload, something disposable
[18:20] <m1x10> hi natrium42
[18:20] <natrium42> the perfect car for chasing --> http://www.watercar.com
[18:20] <fsphil> in saying that though, I'm very tempted to get a little inflatable boat
[18:20] <natrium42> hello m1x10pulis
[18:20] <fsphil> ooh that's good
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[18:21] <natrium42> fsphil, cheap inflatable boats get punctured easily... and i am not sure if you'd want to be in one at sea
[18:21] <fsphil> ooh good point
[18:22] <m1x10> natrium42: what? :):)
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[18:30] <natrium42> bbl
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[20:51] <jcoxon> ping fsphil
[20:51] <fsphil> pong jcoxon!
[20:51] <jcoxon> http://spacenear.us/float-prediction/#
[20:51] <jcoxon> its rediculously dirtily hacked
[20:52] <jcoxon> and has old data
[20:52] <jcoxon> but the burst icon is actually sunrise
[20:52] <Randomskk> also might need bigger lat/lon deltas by the looks of things
[20:52] <Randomskk> looks neat though
[20:52] <jcoxon> Randomskk, nah
[20:52] <jcoxon> so it takes each lat and lon, calculates sunrise at that point
[20:52] <jcoxon> if it equals the current prediction time it puts the icon
[20:54] <fsphil> the burst icon is near the start of the track
[20:54] <fsphil> ah wait, see the sunrise icon on one of them
[20:54] <jcoxon> yeah but those launches are at night
[20:55] <jcoxon> so its only a few hours before sunrise
[20:55] <jcoxon> and therefore sunrise icon is early in the float
[20:55] <fsphil> ack yea, forgot about that
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[20:57] <jcoxon> took me ages to get this working
[20:57] <fsphil> it's great, proves it can travel the length before sunrise
[20:58] <jcoxon> yeah
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[21:23] <Darkside> fsphil:
[21:23] <Darkside> could you possibly document exactly what you needed to change to get higher RTTY baud rates?
[21:23] <Darkside> i really need 600 baud working
[21:27] <fsphil> I'll send you a patch, one sec
[21:28] <Darkside> w00
[21:32] <fsphil> Darkside, http://www.sanslogic.co.uk/files/dl-fldigi-600b-1200b-rtty.patch
[21:33] <fsphil> haven't tested on-air, but works when playing back generated files
[21:34] <Darkside> ok
[21:34] <Darkside> i can test it on air today probably
[21:34] Action: kd0mto is going to attempt a PSK software modem soon.
[21:34] <fsphil> I did it ages ago when I was first playing about with the ntx2
[21:34] <Darkside> if 600 baud works, i might suggest including it in fldigi
[21:34] <kd0mto> Yay for dsPICs!
[21:34] <Darkside> i mean
[21:35] <Darkside> including it in the main repo for fl-fldigi
[21:35] <Darkside> dl
[21:35] <fsphil> well it's such a simple modification, they might be up for it
[21:35] <fsphil> though as an amateur mode it's probably of limited value
[21:35] <fsphil> psk would be very cool
[21:36] <fsphil> seems to be quite tricky to do on a microcontroller
[21:36] <kd0mto> Not with a dsPIC
[21:36] <kd0mto> Looking at the parts, I think I can do it for $40.
[21:36] <Darkside> with my ad9835, i can transmit QPSK easily :P
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[21:37] <fsphil> I've an idea for doing it with pwm and a low pass filter, but there'd be no control over the frequency other than what the crystal is
[21:37] <Darkside> with no conversion
[21:37] <Darkside> fsphil: n00b question.... how do i apply the patch?
[21:38] <fsphil> at the top of the source: patch -Np1 < nameofthe.patch
[21:38] <fsphil> woo, 1200 baud works locally
[21:38] <fsphil> fills almost the entire 3khz bandwidth though :)
[21:39] <kd0mto> fsphil: Wrong.
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[21:39] <fsphil> frequently :)
[21:39] <Darkside> fsphil: this is my concern about using 1200 baud FSK on HF
[21:39] <Darkside> it's going to use a shitload of bandwidth
[21:40] <fsphil> yea, rtty become a problem at anything over 300 baud
[21:40] <fsphil> possibly why they didn't include it in fldigi
[21:42] <Darkside> still, with a few watts of transmit power, i reckon i can do it
[21:42] <Randomskk> why not mfsk?
[21:42] <Randomskk> or dominoex or something else pretty
[21:42] <Darkside> because its harder to code :P
[21:42] <fsphil> I might bringing the payload next time I'm up the local mountain, see how 600 or 1200 baud does at distance
[21:43] <Darkside> if you want to show me some nice code to get from data to the symbols i need to use with MFSK64, please do
[21:43] <Darkside> basically once i know the symbols i need to transmit, i can set the output frequency on my signal generator
[21:43] <fsphil> mfsk doesn't handle frequency drift well?
[21:44] <Darkside> for domino, i just use DanielRichman's code, and modified the way he sets the frequency
[21:44] <fsphil> though your not using the ntx2 -- your hf transmitter might not drift
[21:44] <Darkside> it works perfectly
[21:44] <Darkside> :)
[21:44] <Darkside> it didn't drift at all when we launched it
[21:44] <Darkside> but that was because it was in a heated box :P ... damn linear regulators
[21:44] <fsphil> haha
[21:44] <fsphil> I like jcoxon's idea of the resistor heater
[21:46] <Darkside> in my case the linear regulator was sitting at 75 degrees >_>
[21:46] <Darkside> the inside of my box never got below -5 degrees C
[21:46] <fsphil> eek, how much juice where you putting through it?
[21:46] <Darkside> only about 2 watts
[21:46] <Darkside> i've replaced it with a switchmode supply now
[21:47] <Darkside> anyway, it was an awesome test, it worked very well
[21:48] <Darkside> and i have tested my signal generator down to -40 degrees C - it drifts up 300Hz
[21:48] <fsphil> that's excellent
[21:48] <fsphil> the ntx2 drifts if you look at it hard enough
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[21:49] <Darkside> oh, 've seen it drift
[21:49] <Darkside> when i was navigating for juxta, i had to retune the radio a few times
[21:51] <fsphil> a little heater, small enclosure and a temperature sensor should do wonders for it
[21:51] <Darkside> and waste power
[21:52] <Darkside> you can always compensate for the drift on the recieving end
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[21:52] <fsphil> for mfsk modes or unattended stations it would be very handy
[21:53] Nick change: SpeedEvil1 -> SpeedEvil
[21:53] <Darkside> true, but why would you use a NTX2 for them :)
[21:53] <Darkside> so many better options...
[21:53] <fsphil> cause I've little else :)
[21:53] <Darkside> haha
[21:54] <Darkside> well, when i make my complete board for my transmitter, i'll make a version where i leave out the Xmega
[22:06] <Darkside> then you guys can wire it into whatever microcontoller you use, and have a play
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[22:21] <fsphil> how do you control it? voltage driving frequency, or direct conversion?
[22:22] <Laurenceb> heh newsnight
[22:23] <Laurenceb> this has become way to mainstream
[22:23] <Laurenceb> time for me to hang out somewhere else XD
[22:23] <Laurenceb> ok nonones even noticed- us balloon guy was just on newsnight
[22:25] <fsphil> lol
[22:25] <fsphil> anyone we know?
[22:25] <Laurenceb> i dont know, just caught it
[22:25] <Laurenceb> iplayer
[22:26] Action: Laurenceb is reading http://books.google.com/books?id=4UKkAeMpKcoC&printsec=frontcover&dq=nmr+william+s+price&hl=en&ei=pxq-TJqFLoqUOoKStTg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDEQ6AEwAA#v=onepage&q&f=false
[22:27] <Laurenceb> well paper copy - seems to go over motion based nmr stuff fairly well
[22:30] <fsphil> ah, good bit of bedtime reading
[22:31] <Laurenceb> heh
[22:31] <fsphil> I've just started reading Contact
[22:34] <Darkside> fsphil: SPI programmd
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[22:34] <Darkside> fsphil: DAMN YOU
[22:35] <Darkside> i havent been able to find a copy of it around here :(
[22:35] <SpeedEvil> Interesting.
[22:42] <fsphil> night all
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[23:38] <Laurenceb> looks like im not using the cc1020 properly
[23:39] <Laurenceb> have to do more pll calibrations
[23:39] <Laurenceb> and setup powerdown mode to do so
[23:39] <SpeedEvil> wrong freq?
[23:39] <SpeedEvil> I thoughtyou'd got it recieving.
[23:39] <Laurenceb> probably explains the glitchyness
[23:39] <SpeedEvil> ah.
[23:39] <Laurenceb> its not working 100%
[23:39] <Laurenceb> i can make it behave by power cyclng a few times
[23:40] <Laurenceb> but thats hardly ideal
[23:40] <SpeedEvil> I see.
[23:40] <SpeedEvil> Consistency is good.
[23:40] <Laurenceb> eek the example code is horrible
[23:40] Action: SpeedEvil ponders a razor-edged rocket powered flying wing.
[23:40] Action: SpeedEvil has been hedge-trimming.
[23:41] <Laurenceb> power down, sequential clock signal enables and checks, pll calibration, power back down, enable hardware in the right order
[23:41] <Laurenceb> no wonder my bash the settings into the registers code is misbehaving
[23:42] <Laurenceb> they have atmega8 example code, but its bit bandged spi and lots of other features i dont need
[23:42] <Laurenceb> still probably easiest to trim it down and use it
[23:43] <Laurenceb> on the pother hand http://svn.jonathanwagner.net/cape/CAPE1/Communications/Software/Code/trunk/firmware/comm.c
[23:43] <Laurenceb> "CAPE1 picosatellite with * the onboard computer (OBC). This includes configuring the Chipcon CC1020" sweet
[23:44] <SpeedEvil> That doesn't look too bad.
[23:44] <SpeedEvil> The closes I'm getting to RF at themoment is awaiting deliveryof a bluetooth OBEX port.
[23:45] <Laurenceb> http://svn.jonathanwagner.net/cape/CAPE1/Communications/Software/Code/trunk/libs/ hell yeah
[23:45] <SpeedEvil> Err
[23:45] <SpeedEvil> ODBII
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[23:47] <Laurenceb> ill grab that 2morrow and rewrite it to remove the pic spi stuff
[23:47] <Laurenceb> looks like a perfect implimentation of the chipcon blerb
[23:47] <SpeedEvil> :)
[23:47] <Laurenceb> musy be i guess, nonone to power cycle it for you in space :P
[23:47] <Laurenceb> time for zzz, cya
[23:48] <SpeedEvil> Night!
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[23:54] <Whiskey> Hey guys. I've recently seen a video of someone that sent a weather balloon to high altitude and recorded it in HD and I have to say I'm intrigued...does anyone know if this has been done in Canada yet? I have no idea what hoops I would have to jump through to do something like this in Canada. Right now I'm more interested in what it takes to put something like this together but I could see someday I may want to try this. Looks
[23:54] <Whiskey> like an interesting technical challenge.
[23:56] <The-Compiler> Whiskey: take a look at natrium42's project at www.natrium42.com/halo - I think he's canadian
[23:58] <Whiskey> that's great. thanks. do you know of any other sites I could look into to get an idea of the hardware I would need for this type of project as far as maybe some kind of gps tracking so that I could start with small launches to test logging and retrieval? I'm interested in learning how to retrieve a project once it's launched
[00:00] --- Wed Oct 20 2010