highaltitude.log.20100929

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[06:48] <Darkside> juxta__: -15 degrees and dropping
[06:48] <Darkside> sorry, -18 degrees
[06:49] <Darkside> i have my transmitting sitting in dry ice
[06:49] <juxta__> ooh :)
[06:49] <Darkside> it hasnt drifted noticeably
[06:49] <Darkside> maybe 100 Hz
[06:50] <Darkside> -22 and dropping
[06:51] <Darkside> -25
[06:52] <Darkside> and i dont think its drifted by more than about 100Hz
[06:52] <Darkside> lol
[06:52] <Darkside> this is awesome
[06:56] <m1x10> morning
[06:56] <m1x10> Darkside u test radio shift?
[06:56] <Darkside> yup
[06:56] <m1x10> in low temp
[06:57] <m1x10> cool
[06:57] <Darkside> it hasnt shifted by any more than about 100Hz so far
[06:58] <m1x10> let it reach at least -40C
[06:58] <m1x10> which radio btw?
[06:58] <Darkside> a AD9835 DDS
[06:58] <Darkside> HF
[06:59] <Darkside> and yeah, im gonna let it drop below -40 if i can
[07:03] <Darkside> -36
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[07:04] <Darkside> dl-fldigi just crashed
[07:05] <Darkside> lol
[07:05] <Darkside> -37
[07:09] <m1x10> lol
[07:09] <m1x10> you should report it to fsphil
[07:09] <Darkside> -38 now :)
[07:09] <Darkside> insignificant drift :)
[07:09] <Darkside> but i'll still need to analyse the data once i'm done
[07:09] <Darkside> i'm recording aSHITLOAD of audio
[07:09] <Darkside> lol
[07:09] <m1x10> :p
[07:10] <Darkside> that way i can check out the shift frequency, and the carrier freq
[07:13] <Darkside> -39
[07:13] <Darkside> its dropping slooooooowly
[07:13] <Darkside> its because i have the board wrapped in bubble wrap
[07:13] <Darkside> to try and stop thermal shock
[07:14] <m1x10> where do u find that dry ice?
[07:14] <Darkside> i'm at uni
[07:14] <Darkside> so i just went to the chemistry department :P
[07:14] <m1x10> oh
[07:15] <m1x10> thats a good idea now that im thinking
[07:15] <m1x10> but I dont know if they we accept me
[07:15] <m1x10> Im not from their university
[07:15] <m1x10> Im not a student anymore
[07:20] <DagoRed> In the states you can pick that up at the grocery store.
[07:21] <DagoRed> I just hate how we get carded for buying it now
[07:21] <Darkside> oh yeah thats what i should do
[07:21] <Darkside> i'll have plenty of left ovet dry ice
[07:21] <Darkside> i should make some dry ice bombs :)
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[07:21] <Darkside> *cough*
[07:24] <Darkside> its been sitting at -39 for a loooong time now..
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[07:29] <m1x10> :p
[07:29] <m1x10> send me your dry ice by post :)
[07:29] <Darkside> lol
[07:29] <Darkside> noi
[07:29] <Darkside> no
[07:29] <m1x10> haha
[07:30] <m1x10> maybe that fishermen shops have that ice
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[08:14] <earthshine> morning
[08:14] <Darkside> well, lipo batteries do not like low temperatures
[08:27] <Darkside> juxta__: final results: 300Hz drift at -39 degrees C
[08:27] <juxta__> awesome
[08:27] <Darkside> thats crap all
[08:27] <Darkside> which is very cool
[08:27] <juxta__> yeah I think you can live with that :)
[08:27] <juxta__> no luck with the batteries though?
[08:28] <Darkside> the lipo didn't like the -60 degrees i dropped it to :P
[08:28] <Darkside> i think i'll just go with lithium primaries
[08:30] <Darkside> juxta__: http://cgi.ebay.com.au/32-x-1-5V-AA-ENERGIZER-LITHIUM-POWER-BATTERIES-ORIGINAL-/220650122965?pt=AU_Electronics_Batteries_Chargers&hash=item335fc5aed5#ht_2583wt_1030
[08:31] <juxta__> :)
[08:32] <Darkside> what capacity are they?
[08:33] <juxta__> 3000mah
[08:33] <Darkside> cool
[08:33] <juxta__> dishes time, brb
[08:45] <Darkside> juxta__: how many lithium primaries do you have around? in case these don't get here in time
[08:49] <juxta__> at least 20 I think
[08:49] <juxta__> Darkside, you'll be abord on oct 10 then? :)
[08:50] <Darkside> yeah i think so
[08:50] <Darkside> it works fine as it is
[08:50] <juxta__> awesome
[08:50] <Darkside> might need to put some padding around my prototype
[08:50] <Darkside> also what can i put it in?
[08:50] <juxta__> how do you mean?
[08:50] <juxta__> no rocks allowed
[08:50] <Darkside> the payload case
[08:51] <juxta__> no small children either
[08:51] <Darkside> foam and stuff
[08:51] <Darkside> whaaaaaaat
[08:51] <Darkside> small children make great padding
[08:51] <Darkside> damn
[08:51] <juxta__> foam is cool
[08:51] <juxta__> i have heaps if you need it
[08:51] <Darkside> oh that woudl be cool
[08:51] <juxta__> a gaint bag of offcuts from clark rubber
[08:51] <Darkside> haha
[08:51] <Darkside> i need something to put all my stuff in..
[08:52] <Darkside> battery, main-board, amp, balun, and batteries
[08:52] <juxta__> give me some dimensions and I can make you a polystyrene box
[08:52] <juxta__> or make me some drawings and i'll make it from those ;p
[08:54] <Darkside> hahaha
[08:54] <Darkside> hmm
[08:54] <Darkside> i'll see about getting some dimensions...
[08:55] <Darkside> i might need to go to clark rubber and get some soft foam to put inside some of my boxes
[08:55] <Darkside> i dont want things breaking on landing
[08:56] <juxta__> yeah
[08:56] <juxta__> well it's easy enough to have everything sitting in foam
[08:56] <juxta__> you'd really have to hit the ground very hard to break anything then
[08:56] <Darkside> yeah
[08:56] <Darkside> i'd rather have it safe :)
[08:57] <Darkside> since this is my only prototype atm
[08:57] <juxta__> as you saw though they come down gently
[08:57] <juxta__> well, usually at least ;p
[08:57] <Darkside> haha
[08:57] <Darkside> hmm, gonna need some portable HF RX equipment for chasing
[08:57] <Darkside> did adrian end up getting you a Codan ATU yet? :P
[08:57] <juxta__> haha
[08:58] <juxta__> neg
[08:58] <Darkside> aww
[08:58] <juxta__> however he has portable HF in his truck
[08:58] <juxta__> and does Matt now
[08:58] <Darkside> ok
[08:58] <Darkside> im still not sure what band i should use...
[08:58] <juxta__> and so does*
[08:58] <Darkside> i was thinking high end of 40m
[08:58] <juxta__> do you have a license yet? ;p
[08:58] <Darkside> nope :P
[08:59] <Darkside> could use the 13MHZ ISM band
[08:59] <Darkside> but most receivers dont have equipment for that band - the closest they would have is 20m
[08:59] <juxta__> ah
[09:00] <Darkside> im not sure how to deal with the licensing for it..
[09:01] <Darkside> how was the amateur repeater done?
[09:01] <juxta__> well so long as your filters work well & you're not transmitting out of spec you're welcome to use my callsign :)
[09:01] <Darkside> haha, the filters certainly work
[09:01] <juxta__> i'll be in attendance so legally that should be fine
[09:01] <juxta__> the repeater was announcing itself as Adrian's callsign
[09:02] <Darkside> im thinking of using a bit of code that switches from RTTY300 to DominoEX8 once the battery voltage drops to a certain point
[09:02] <juxta__> cool
[09:02] <Darkside> i'd like to do some power tests
[09:02] <Darkside> like, get up on a hill somewhere, set up a dipole, and transmit at different power levels to people around adelaide
[09:02] <juxta__> well - want me to make arrangements for you to ride in say Matt's car?
[09:02] <Darkside> yeah that would be great
[09:03] <juxta__> i'll see if he can have a seat for you plus a HF radio for you ;)
[09:03] <Darkside> for the callsign, i guess i should just replace $$DARKSIDE with $$VK5VZI?
[09:03] <Darkside> is that sufficient?
[09:03] <juxta__> leave it as darkside
[09:03] <juxta__> just put an announce line every 10 minutes
[09:03] <Darkside> ok
[09:04] <Darkside> i'll just do that every X transmits or something
[09:04] <juxta__> yup that shoulkd be fine
[09:04] <Darkside> if txCount%200 == 0
[09:04] <Darkside> or whatever
[09:07] <Darkside> shit, i'd better put in the code to put my ublox5 chip into altitude mode..
[09:07] <Darkside> i noticed you had code in there to read the ACK back from the chip - is this really needed?
[09:11] <Darkside> if (counter%200 == 0) TXString("DE VK5VZI Project Horus Launch projecthorus.org \n");
[09:14] <Darkside> juxta__: how were you planning on positioning the payloads? also it might be an idea to test reception of both payloads when they are together
[09:14] <Darkside> i doubt 40mW will do anything, but you never know
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[10:04] <m1x10> Darkside u need to set ublix5 to airbone mode.
[10:04] <Laurenceb_> hi
[10:04] <Darkside> m1x10: yeah i know i do
[10:04] <m1x10> hey
[10:04] <Darkside> about to add that to my code
[10:04] <m1x10> So u do it in code.
[10:05] <Darkside> i need to add it to my gps init function
[10:05] <m1x10> the code sample is here
[10:05] <m1x10> http://ukhas.org.uk/guides:falcom_fsa03
[10:09] <Darkside> yeah
[10:09] <Darkside> just used it :)
[10:15] <Laurenceb_> http://www.bbc.co.uk/newsbeat/11430299
[10:16] <Laurenceb_> then why is she naked ??
[10:16] <Laurenceb_> me thinks they confused upload with download
[10:25] <Darkside> if((bat_voltage < BATT_THRESHOLD) && (data_mode != RELIABLE)){
[10:25] <Darkside> new_mode = RELIABLE;
[10:25] <Darkside> }
[10:25] <Darkside> :P
[10:26] <Laurenceb_> shouldnt that be >
[10:26] <Darkside> no
[10:27] <Darkside> if the battery voltage drops below a certain point, i switch to a more noise-resistant mode
[10:27] <Darkside> because at the battery voltage goes down, so does my TX output power
[10:28] <Darkside> i havent properly characterised the amplifier yet, but at 12v in i get 40mW out
[10:28] <Darkside> that *should* be fine for RTTY300...
[10:28] <Darkside> i hope
[10:28] <Laurenceb_> ah
[10:29] <Darkside> the switchmode regulator i'll be using should give me a stable 5v supply for a long time
[10:29] <Darkside> as long as the supply voltage is above 6.2v, i'll have 5v
[10:29] <Darkside> but at 6.2v, i doubt my amplifier will output much power
[10:30] <Darkside> so i might have a third mode, where it just drops to transmitting QRSS when the battery gets *really* low
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[10:50] <Darkside> juxta__: do you have gtalk or something?
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[11:21] <juxta__> Darkside, I have skype
[11:25] <Darkside> added
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[11:42] <Upu> m1x10 "My partner had been made redundant and I know damn well that he was in bed and hadn't got up and started download pornography."
[11:42] <Upu> Yeah right :)
[11:59] <Laurenceb_> the funniest thing is that she appears to be naked
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[13:54] <m1x10> Upu
[13:54] <m1x10> ?
[13:54] <m1x10> i was sleeping
[14:10] <Upu> Hey m1x10
[14:10] <Upu> you made a comment about the BBC ACS Law article
[14:10] <Upu> where the disbelieve girlfriend refused to accept her unemployed husband downloaded "Chubby Chasers" :)
[14:11] <Upu> disbelieving P)
[14:11] <Upu> fingers today
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[14:21] <ms7821> so we have a slightly mad plan to do some low aerial shots with a video camera - can anyone suggest a good place to get hold of balloons and helium?
[14:23] <ms7821> and is there a reasonable size/height before it's a good idea to tell caa/atc?
[14:23] <m1x10> Upu wasnt my comment
[14:23] <m1x10> :P
[14:24] <m1x10> read carefully
[14:24] <m1x10> :p
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[14:35] <Upu> oh sorry Laurenceb :)
[14:35] <Upu> ms7821 depends how high :) Get a kite ?
[14:37] <ms7821> yeah, that's something we're considering at the moment
[14:37] <ms7821> but a tethered balloon seems more stable and less likely to end up with expensive broken equipment
[14:38] <Upu> if it's tethered I don't see why you would need to speak to CAA however if it broke loose it will go high :)
[14:38] <Upu> Balloons http://www.randomsolutions.co.uk/Random_Engineering/Welcome.html
[14:39] <Randomskk> tethered balloons tend to be harder than you might think, they have a massive surface area and get blown really hard
[14:39] <Randomskk> mostly they don't tend to be up so much as sideways except in still weather
[14:39] <ms7821> aha, that's a good link :)
[14:40] <ms7821> Randomskk: yeah, I'm thinking a couple of anchors at least
[14:40] <Randomskk> yea, that would help
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[14:40] <Upu> Personally I'd put a cheap A560 from T'Bay up on a kite
[14:41] <ms7821> I guess we need to work out what area we want to cover and how high that means we need
[14:41] <Upu> those ram air kites can generate heaps of lift
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[14:42] <ms7821> hmm, a decent kite is about the same costwise
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[14:46] <ms7821> where's best to get helium, then, or is it just boc/boc reseller?
[14:47] <Upu> I've not done that step yet so not sure
[14:47] <Upu> there is a suppliers page up at ukhas.org.uk
[14:48] <Randomskk> but mostly just boc
[14:49] <chris_99> do you guys have your own cylinders or do you rent them?
[14:49] <ms7821> ta
[14:50] <Randomskk> mostly people rent
[14:52] <chris_99> aha
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[16:08] <W0OTM> howdy
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[17:00] <m1x10> I want to get rid of arduino.
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[17:04] <chris_99> thinking of switching to using the microcontroller directly, m1x10?
[17:06] <m1x10> yeah
[17:07] <m1x10> now I just have the arduino for the controller,crystal,jack and some minor things
[17:07] <m1x10> which i imaging its easy to put them on a single board
[17:07] <chris_99> ah, you're going to take out the Atmel chip
[17:08] <m1x10> yeah with arduino bootloader
[17:08] <chris_99> cool, i've never used those before only PICs
[17:08] <m1x10> ive never used electronics before !
[17:09] <m1x10> I own this channel all my knowledge !
[17:12] <m1x10> also without arduino, I can use just 4 batteries for 6v.
[17:13] <m1x10> And not 6bats for 9v
[17:13] <chris_99> aha, didn't know the arduino required that kind of voltage
[17:13] <m1x10> cause arduino regulator has large dropout which makes you input 9v
[17:13] <chris_99> aha
[17:14] <m1x10> i found this guy
[17:14] <m1x10> http://www.national.com/mpf/LP/LP3962.html#Overview
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[17:14] <m1x10> 380mV dropout at 1.5A
[17:15] <chris_99> looks cool, i'm using the 7805 at the moment, but could do with trying out stuff like that
[17:17] <m1x10> 7805 has 2+v dropout
[17:18] <chris_99> not too great heh
[17:18] <m1x10> :p
[17:19] <m1x10> on arduino website it declares that you need >=9v
[17:19] <m1x10> and explains the regulator issue
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[17:38] <stilldavid> the arduino pro has a LDO reg on it
[17:38] Action: stilldavid plugs his employer
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[17:42] <m1x10> first time i see that board
[17:44] <m1x10> stilldavid, is it going to work with 6v input/
[17:44] <m1x10> ?
[17:45] <stilldavid> yeah, that's what I used just fine.
[17:45] <stilldavid> I forget the voltage drop, but it's pretty low
[17:45] <stilldavid> it's basically an arduino without the ftdi chip on board
[17:45] <m1x10> yeah 15E
[17:45] <m1x10> really cheap
[17:46] <stilldavid> comes in 5v and 3.3v versions
[17:46] <m1x10> y
[17:46] <m1x10> it lacks the power jack
[17:46] <m1x10> but thats nothing special
[17:46] <stilldavid> psh, just solder in some wires.
[17:46] <m1x10> yeah
[17:46] <m1x10> the pin layout is compatible for shields?
[17:46] <m1x10> like normal arduino?
[17:47] <stilldavid> but I'd still design a board around the AVR chip if you want
[17:47] <stilldavid> yes, it is
[17:47] <m1x10> basically im going to use atmega644
[17:48] <m1x10> my flight system will contain many crap
[17:48] <m1x10> so i need some more code space and uart
[17:48] <stilldavid> yeah, do it. always more fun to DIY
[17:48] <m1x10> yeah
[17:48] <m1x10> but i can use this board for my autonomous backup recovery system
[17:48] <stilldavid> there's always the arduino mega, though :)
[17:49] <m1x10> ee thats big
[17:50] <m1x10> oh
[17:50] <m1x10> that arduino pro does not have the headers!
[17:50] <m1x10> im very bad at soldering stuff
[17:52] <m1x10> Max 150mA output
[17:52] <m1x10> stilldavid
[17:52] <m1x10> it can only output 150ma?
[17:53] <stilldavid> what can the arduino (regular) do?
[17:53] <m1x10> eee?
[17:53] <m1x10> 7805 outputs 1A i think
[17:54] <stilldavid> oh, for the reg. then yes, that's true
[17:54] <stilldavid> price of a LDO I suppose
[17:54] <m1x10> my system requires 500mA for the GSM to work in a average level
[17:55] <stilldavid> plus a 7805 would keep everything toasty too :)
[17:55] <m1x10> u can replace that reg with something better like LP3962
[17:55] <m1x10> and incease the price for about 1 dollar
[17:55] <m1x10> wouldnt be that much
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[18:46] <jcoxon> evening all
[18:49] <fsphil> howdy jcoxon
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[18:55] <jcoxon> hey fsphil
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[19:11] <jcoxon> wow 57 people
[19:12] <natrium42> yes, but most of them are absent
[19:12] <SpeedEvil> I'm not.
[19:12] <jcoxon> i'm not!
[19:12] <DanielRichman> standard irc practice
[19:12] <jcoxon> hehe
[19:12] <SpeedEvil> Actually, I am.
[19:13] <SpeedEvil> My legs have just fallen off.
[19:13] <jcoxon> its about time we had a launch
[19:13] <SpeedEvil> The wonders of public transport.
[19:13] <natrium42> at least you have some
[19:13] <SpeedEvil> And being tired when reading timetables.
[19:13] <SpeedEvil> yeah.
[19:14] <SpeedEvil> It is a vital resource.
[19:14] <SpeedEvil> It's just fundamentally hard to use for untractable reasons
[19:14] <jcoxon> natrium42, you working on a ntx2 launch then?
[19:15] <natrium42> i can only work on it in november
[19:15] <natrium42> :S
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[19:15] <jcoxon> thats okay
[19:15] <natrium42> going to be an exhibitor on a photo exhibition
[19:15] <natrium42> need to prepare & stuff
[19:15] <jcoxon> :-)
[19:15] <natrium42> it's at the end of october
[19:16] <jcoxon> fair enough
[19:16] <jcoxon> steve is busy as well
[19:16] <jcoxon> so we'll launch the test flights when they are ready...
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[19:40] <spacefelix> Are there similar restrictions to high-altitude RC gliders as they are for balloons?
[19:41] <jcoxon> spacefelix, depends where you are
[19:41] <jcoxon> most likely more restrictions
[19:41] <spacefelix> E class airspace.
[19:41] <spacefelix> With a breif crossing through A class.
[19:42] <jcoxon> in theory they are UAV and so most countries are pretty strict
[19:43] <spacefelix> Hmmm.
[19:43] <spacefelix> So then it would have to follow FAA rules if it goes above typical RC altitudes?
[19:44] <spacefelix> Or CAA...
[19:44] <jcoxon> i suspect so - i'm not an expert in the area
[19:44] <spacefelix> mmm.
[19:44] <jcoxon> steerable parachute/parafoil - different matter
[19:44] <spacefelix> Hmmm.
[19:44] <jcoxon> cause that would still fall in the rules for balloons
[19:45] <spacefelix> So put a motor on it and you bypass the rules. ;)
[19:45] <jcoxon> as the payload 'descends by parachute'
[19:45] <spacefelix> Ah, nm.
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[21:22] <W0OTM> http://www.youtube.com/watch?v=mrgGgOn0yjU
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[21:24] <fsphil> grrr,, youtube being throttled
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[21:45] <W0OTM> fsphil: ?
[21:46] <fsphil> ah just my isp being twats
[21:46] <fsphil> they've throttled youtube so that a 1 minute video takes about 30 minutes to buffer
[21:47] <W0OTM> wow
[21:49] <meefs> whaaaaaaaat
[21:49] Action: meefs would sue
[21:51] <fsphil> haha, nah I'll just change -- though everytime I do the same company buys out the new isp, and a few months later it all starts again...
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[00:00] --- Thu Sep 30 2010