highaltitude.log.20130502

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[01:37] <codrBlu> I'm working on a flight computer based on a 3.3V Arduino Pro Mini which reads data from the GPS, stores in on an SD card and then transmits the data over APRS. I could certainly use some feedback on whether I have missed anything in how I am wiring up the components. Thanks if you can have a look: https://docs.google.com/drawings/d/1e-NiHD_8oHwS_RBc_J0wTqoCtyc1oWo574t-cEKnI2w/edit?usp=sharing
[01:39] <nigelvh> codrBlu, I'd probably swap that 20k for a 0.1uF capacitor
[01:40] <codrBlu> Ok. Thanks.
[01:40] <nigelvh> Also, why is one of the 4.7k resistors tied to the control line?
[01:41] <codrBlu> It's a voltage divider.
[01:41] <nigelvh> In theory you'd want one tied to 5v, and one tied to GND, which should keep the modulation pin in the center of the range.
[01:42] <codrBlu> http://ukhas.org.uk/guides:linkingarduinotontx2
[01:42] <nigelvh> If it's tied to the control line, you'll bring the line HIGH to enable the radio, and it's just going to be two 4.7K resistors in parallel pulling the line up.
[01:42] <nigelvh> Yes, in that diagram they've got the 4.7K tied to ground.
[01:42] <nigelvh> The other 4.7k is tied to VCC
[01:43] <codrBlu> Ooops. I see my mistake
[01:44] <nigelvh> I'm assuming you're planning to use trackuino?
[01:45] <nigelvh> Also, you're going to want to power the HX1 from 5V, not 3.3V
[01:47] <codrBlu> I thought you said earlier that 3.3V would be ok?
[01:47] <nigelvh> No, that must have been someone else. I said that 3.3V modulation would probably be ok. It still needs 5V power.
[01:48] <codrBlu> Ah. I see.
[01:49] <nigelvh> Did you say you were planning to use trackuino?
[01:50] <codrBlu> The code? Yes I will probably use much of that code.
[01:51] <nigelvh> Ok, then yes, I would certainly recommend replacing the 20k resistor with a 0.1uF capacitor
[01:52] <codrBlu> How does that change the function of the TXD pin?
[01:52] <nigelvh> How modulation happens in the arduino. The UK guys use RTTY with a different module and modulate it differently.
[01:53] <codrBlu> Will I still send a digital signal to that pin?
[01:54] <nigelvh> Yes, it will be a digital pin, but the trackuino code tries to approximate an analog signal by flipping the pin very quickly.
[01:54] <nigelvh> The UK guys don't do that and that's why the capacitor is likely to give better results.
[01:58] <codrBlu> The voltage divider on that pin seems to be better suited to the UK method. Now that I look at it, the Trackuino circuit just connects pin 7 TXD to the Arduino. Maybe I don't need the extra resistors.
[01:59] <nigelvh> If you're using trackuino I'd recommend following their examples. My code is a bit different, so I do end up using the two resistors for bias and a capacitor.
[02:02] <codrBlu> Cool. Thanks for the tip
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[06:08] <x-f> mor.. (yawn) ..ing
[06:10] <x-f> http://media.tumblr.com/faad5abf9d580cf30fde48a39b6a512b/tumblr_inline_mlw0potdNo1qz4rgp.gif
[06:11] <x-f> i've been watching it for a few minutes now, don't know why
[06:11] <x-f> or why was it made
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[06:33] <arko> when asked, the engineers responded "I dunno, for teh lulz?"
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[07:17] <griffonbot> Received email: John Underwood "Re: [UKHAS] Launch announcement - Vortex flight 5 - Thursday 2013-05-02"
[07:17] <junderwood> Still looking good for the launch today.
[07:18] Nick change: junderwood -> junderwood_M0JCU
[07:18] <junderwood_M0JCU> 11:00 am BST from Chalgrove, UK
[07:18] <junderwood_M0JCU> Landing about 10 miles to the NE.
[07:18] <x-f> good luck with the flight
[07:18] <junderwood_M0JCU> Payload splitting into two at 25 km.
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[07:19] <junderwood_M0JCU> Upper payload will probably only reach 30 km - we're putting in lots of He
[07:33] <arko> new mythbusters was interesting
[07:34] <arko> they revisited their first myth of the rocket car.. so i had to watch
[07:37] <costyn> arko: that first episode was awesome. When I first saw that show I was instantly a fan. right up my alley so to speak :)
[07:45] <SpeedEvil> arko: you gotta phrase it right. 'to test behaviour post vertical impulsive position change after dynamic reconfiguration onto a compliant damped system.'
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[08:11] <arko> Haha
[08:11] <arko> Yeah
[08:11] <arko> Watched it with a few friends and they all thought one thing and i was the only to think the other
[08:12] <arko> Im not goijgnto spoil
[08:12] <arko> But i totally got the result right
[08:12] <arko> Pretty obvious... but then again im the only engineer in my group of friends.. everyone else is computer sec :/
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[08:45] <fsphil> OT, but cool: http://www.nasa.gov/topics/earth/features/grover.html
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[09:00] <G6WTR> be usefull for a correct freq for VORTEX 3 please. Andy
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[09:07] <costyn> fsphil: that is cool.. .so it's cheaper to send in a robot than a team of humans?
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[09:12] <mfa298> G6WTR: they're listed in spacenear.us and in the notification email https://groups.google.com/d/msg/ukhas/qNNvji5h4xk/CdSB07XmPvcJ
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[09:22] <vortex-chase> vortex and helioss are online for an 11:00 launcg
[09:22] <vortex-chase> *launch
[09:22] <daveake> RIP "ISH"
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[09:23] <daveake> On-time launching. You could give the rest of us a bad name :[
[09:23] <daveake> :p
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[09:23] <Helioss_Chase> Indeed we are
[09:23] <nommo> Wooo balloons on a school day ;)
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[09:24] Action: nommo nearly brought SDR kit into work
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[09:33] <Helioss_Chase> back up via phone isn't likeling freenode today
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[09:38] <PE2G> Hi all, anyone who knows how long between the two launches?
[09:39] <costyn> PE2G: Helioss_Chase should know :P
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[09:40] <Helioss_Chase> between Helioss and Vortex two payloads one balloon
[09:40] <Helioss_Chase> so no delay
[09:41] <PE2G> OK, I understand, thanks
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[09:44] <G6WTR> I was after the receiver frequency as its a little difficult to y tune my receiever as it g has a VFO fault and I need to use the up daown keys, know the theory frequency but aware the freq is oft a few / 10s of herts higher but many thanks Andy
[09:45] <Maxell> I'm ready for 300 baud. I don't know if it will be any harder. Last time we had diffeculties, but that could have been the 600 baud.
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[09:50] <PE2G> Helioss_Chase: Which payload do you prefer me to monitor from the Netherlands?
[09:50] <Maxell> I'm going for the 300 baud :P
[09:50] <Maxell> trying
[09:50] <Maxell> :P
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[10:08] <mfa298> that looks a bit like a launch
[10:08] <HeliossChase> Vortex or hellioss PE2G the other 2 are back ups
[10:09] <Helioss_Chase> It was
[10:09] <Helioss_Chase> 7we are airborn
[10:10] <mfa298> the 5m/s ascent and altitude 1000m did give it away a bit!
[10:10] <PE2G> HeliossChase: OK
[10:10] <G6WTR> here stuff on 434.651 in southampton
[10:11] <HeliossChase> Should be helioss
[10:11] <junderwood_M0JCU> 300 baud for HelioSS
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[10:21] <Maxell> Nice, can't wait!! I'll see if I can do some 300 baud decodes
[10:23] <vortex-chase> and we're off!
[10:23] <M0JCU> Vortex appears to have antenna trouble. If anyone has a big yagi to point in that direction it would be useful :)
[10:23] <mfa298> was going to say it seems to be a weak signal, but then realised it's approaching the wrong side of the UK for me.
[10:24] <mfa298> (for me thats all of them being weak - although I can get bits from Helioss)
[10:25] <Maxell> PE2G: hehe, it's your time to shine :P
[10:26] <PE2G> Not yet, I'm not on the map yet.
[10:26] <G6WTR> Its very strong on 434.651 good data decode and I am only using a folded dipole for 250Mhz at 20 ft surrounded by an industrial estate! Andy G6WTR
[10:26] <Maxell> :( ?
[10:26] <Maxell> PE2G: you are now!
[10:27] <PE2G> Yes!
[10:27] <mfa298> G6WTR: Southampton seems to be a good location for recieving balloons, I've got a home made 2m dipole hanging out the window which works well if there aren't local obstructions.
[10:27] <PE2G> Costyn is in The Hague I believe
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[10:28] <Maxell> PE2G: I'm too.
[10:28] <Maxell> I am 'revspace'.
[10:28] <mfa298> although it must be the wrong time of day/year as several Southampton listeners aren't here currently.
[10:28] <M0JCU> Exam time :)
[10:29] <PE2G> Maxell: OK
[10:29] <Maxell> 7.3 meters a second rate? :(
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[10:29] <mfa298> M0JCU: that and I think 3rd year projects might be due in about now as well.
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[10:32] <M0JCU> frequency is drifting quickly on Vortex4. Really must sort out the insulation
[10:32] <Helioss_Chase> just had vortex 3 drop back on helioss
[10:34] <M0JCU> Helioss_Chase, you lost the signal?
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[10:34] <Helioss_Chase> yeah had it then it just cutt out
[10:35] <M0JCU> Hmmm
[10:36] <costyn> Maxell: they said they'd put lots of helium
[10:36] <M0JCU> 1 cylinder :)
[10:36] <costyn> M0JCU: why so much?
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[10:38] <M0JCU> If it drifts too far it could land in Wendover wood (or worse)
[10:38] <M0JCU> We just need it to get to 25km for the payload release + a little further
[10:38] <vortex-chase> jcu - is vortex4 data coming through, we've been offline
[10:39] <costyn> M0JCU: ah ok, cool
[10:39] <M0JCU> We don't have data from you on Vortex4. I'm on my own :(
[10:39] <M0JCU> Do you have it?
[10:39] <mattbrejza> is vortex/vortex4 dead or just noone to listen?
[10:40] <vortex-chase> is it cached?
[10:40] <M0JCU> vortex-chase, only locally
[10:40] <M0JCU> mattbrejza, Vortex seems to have a dud antenna connection. Would be OK with a yagi to receive
[10:40] <vortex-chase> which menu do i need in thefldigi to reset the upload?
[10:41] <M0JCU> Vortex 3 aparently packed up a few minutes ago but well worth listening out for
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[10:41] <M0JCU> vortex-chase, does it show as online on the DL Client menu?
[10:41] <Maxell> Ok, I hear the 300 baud signal clearly now. No good decode so far
[10:41] <mattbrejza> vortex 3 is alive
[10:42] <M0JCU> :)
[10:42] <M0JCU> mattbrejza, please could you follow it
[10:42] <vortex-chase> got it ... we should be uploading again
[10:42] <M0JCU> Vortex4 is still there but I have fading. Any other listeners for Vortex 4 would be very much appreciated
[10:42] <mattbrejza> sure
[10:42] <HeliossChase> Vortex3 is back? What on?
[10:42] <G6WTR> Its a good stable signal on 434.651 in EASTLEIGH
[10:42] <M0JCU> vortex-chase, you are back online
[10:42] <mattbrejza> .233 is vortex 3
[10:43] <M0JCU> Vortex4 signal should improve significantly after release. The antenna is currently folded up under the parachute
[10:43] <vortex-chase> ok
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[10:46] <M0JCU> Is there anyone who could listen out for Vortex4 on 434324? Once the cut-down happens it's on its own (Vortex is too weak to receive at the moment)
[10:47] <mattbrejza> well i can switch from vortex3
[10:47] <Maxell> eek, $$HELIOS.954X10:z>:X%1.482,-0092?40,157,-1DZE|6.1ZA8
[10:48] <M0JCU> mattbrejza, one of your receivers?
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[10:48] <Maxell> Here is my audio stream: http://[2001:610:76a:0:221:70ff:fe02:620f]/
[10:48] <M0JCU> does G8KNN have his spare receiver on line today?
[10:48] <mattbrejza> yea im the only one on vortex3 atm
[10:48] <mattbrejza> its coming down
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[10:51] <M0JCU> bugger
[10:51] <costyn> too much He?
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[10:53] <Maxell> Ok, not going to dick around with the 300 baud right now, it doesn't work that rgeat
[10:53] <M0JCU> vortex-chase, Helioss_Chase Bledlow Ridge
[10:54] <mattbrejza> vortex3 has died again
[10:54] <mfa298> Maxell: if you havn't already you need to widen the recieve filter in dl-fldigi for 300 baud
[10:54] <mattbrejza> the signal went noisy then just stopped
[10:54] <vortex-chase> ok
[10:54] <mattbrejza> it was drifting lots at the time
[10:54] <mattbrejza> i have a recording too
[10:55] <Maxell> mfa298: what should it be?
[10:55] <mfa298> try around 300
[10:55] <mfa298> I think the default is around 60
[10:56] <Maxell> It was 300
[10:57] <Maxell> signal is gone now
[10:57] <Maxell> too weak
[10:57] <mfa298> I have found 300 baud harder to get a decode at times when its a weak signal
[10:58] <M0JCU> vortex4 is still available for tracking :) 434.323
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[10:59] <Maxell> mfa298: yeah, damnit...
[10:59] <Maxell> M0JCU: ok, i'll get ready.
[11:00] <M0JCU> vortex-chase, HeliossChase maps updated - Bledlow ridge and Saunderton
[11:01] <eroomde> head towards west wtcombe maybe (take an armed escort)
[11:02] <vortex-chase> ok
[11:03] <Maxell> Temperature, Radio: -27.8 °C
[11:03] <Maxell> wtf?!
[11:04] <M0JCU> predicted landing at 12:17 BST
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[11:07] <vortex-chase> jcu do you have a place name?
[11:08] <M0JCU> vortex-chase, Saunderton
[11:08] <M0JCU> Slough lane would be good
[11:08] <vortex-chase> thanks
[11:08] <M0JCU> map updated
[11:09] <vortex-chase> ok
[11:10] <Maxell> PE2G: It's over :-(
[11:12] <HeliossChase> Lost Helioss just got a carrier
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[11:12] <HeliossChase> On v3
[11:12] <Martijn> Hello all
[11:12] Nick change: Martijn -> Guest49026
[11:12] <Maxell> R.I.P. HELIOSS
[11:13] <M0JCU> vortex-chase, map updated. You really should get some photos. The prediction is quite stable
[11:13] Nick change: Guest49026 -> martijn2
[11:13] <vortex-chase> camera is ready
[11:13] <PE2G> Maxell: That's a pitty. never received anything here in the east...
[11:14] <mattbrejza> chase cars havnt updated in a while :(
[11:15] <Maxell> PE2G: from now on I will not bother with >300 baud if it's not in the 5 degree horizon. I should have not be so ignorant :P
[11:15] <M0JCU> let's hope they went where I told them
[11:15] <Maxell> But hey, I now know that 300 baud is also difficult
[11:16] <vortex-chase> we'v parked up in slough lane
[11:16] <vortex-chase> its right above us
[11:17] <PE2G> Maxell: Yeah >300 bd is difficult over a large dx
[11:17] <mattbrejza> gone here
[11:18] <Maxell> Well, the best I got was "$$HELIOS.954X10:z>:X%1.482,-0092?40,157,-1DZE|6.1ZA8".
[11:18] <Maxell> so meh
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[11:18] <mfa298> also if you're using an sdr with 300bd don't expect to appear in the list of recievers if there's anyone with a real radio also listening as they'll be a packet ahead of you.
[11:18] <M0JCU> lost it from Bicester
[11:18] <vortex-chase> it's gone over the tree line
[11:18] <mfa298> but 300bd is good if you want to improve your overall stats :p
[11:19] <M0JCU> If HeliossChase was where I asked, it should have hit them
[11:19] <HeliossChase> Flew over
[11:19] <HeliossChase> Hit trees
[11:20] <PE2G> I will put the De Bilt ozone sone online at http://sondetracker.radiosonda.sk/v2/index.html . Lauch in about 15 min time
[11:21] <PE2G> Ozone sonde
[11:23] <M0JCU> HeliossChase, hit or went over?
[11:23] <Maxell> PE2G: what software do you use to track those?
[11:23] <PE2G> SondeMonitor from COAA
[11:23] <PE2G> 21 day free trial
[11:24] <M0JCU> HeliossChase, vortex-chase I have updated your maps. I have put you either side of where I think it landed
[11:24] <M0JCU> An upload would remove doubt!
[11:25] <Maxell> PE2G: yeah, and after what? :(
[11:26] <PE2G> Maxell: 20-25 euros I believe
[11:27] <PE2G> Not much, since you can decode most met-sondes
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[11:33] <Maxell> PE2G: I like free (free speech) software
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[11:35] <mfa298> Maxell: there's always the option of write your own, with the amount of people out there decoding sondes I imagine theres a decent amount of into on them
[11:37] <PE2G> Maxell Yeah OTH SondeMonitor's programmer put an enormous amount of time effort in cracking the proprietary commercial Met- telemetry
[11:38] <PE2G> Vaisala ask 4500 euro for their software
[11:39] <PE2G> Graw about the same amount
[11:41] <Maxell> Thats insane...
[11:42] <PE2G> The O3 sonde is up
[11:42] <mfa298> Comercial software for enterprise level stuff is expensive (and the people using the sondes like that are in it at that level)
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[11:43] <mfa298> but that price usually includes a lot of support and help in making it work well.
[11:44] <PE2G> Yes, users get that
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[12:18] <M0JCU> Vortex / HelioSS recovered. Thanks to all who listened.
[12:19] <costyn> M0JCU: good :)
[12:19] <M0JCU> I guess we may have found one of the dodgy Hywoyees
[12:19] <costyn> M0JCU: did you do necklift measurements?
[12:19] <M0JCU> No. Too windy.
[12:19] <M0JCU> but
[12:20] <M0JCU> Predicted burst with 9m3 was 31km
[12:20] <M0JCU> One cylinder=9m3
[12:20] <costyn> ok
[12:20] <costyn> ye
[12:22] <M0JCU> It burst at about 10% of the volume it should have reached
[12:22] <costyn> bah
[12:24] <mattbrejza> 1600g hoywee?
[12:24] <M0JCU> mattbrejza, Yes
[12:24] <M0JCU> Although it was quite windy at the launch so it could have been nicked
[12:25] <mattbrejza> yea 5m/s should have gone a lot highe
[12:25] <mattbrejza> r
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[12:36] <WILLdude> Hi
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[12:47] <PE2G> Interesting 90 deg turn of the O3 sonde at 21 km alt: http://s16.postimg.org/8krg4olzp/Screen836.jpg
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[13:08] <Babs> Hi WILLdude
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[13:56] <eroomde> all quiet on the habben front
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[14:03] <fsphil> habben a nap?
[14:04] <eroomde> habbenero
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[14:06] <costyn> eroomde: name of one of my trackers :)
[14:06] <codrBlu> I habben to be enjoying a bowl of oatmeal with cranberries.
[14:06] <WillDuckworth> not a lot habbening
[14:07] <x-f> hab are you today?
[14:11] <eroomde> i can hab cheezeburger
[14:11] <eroomde> etc
[14:12] <Babs> hab bah
[14:13] <Babs> Every Haber's favourite Swedish 1970s band
[14:13] <codrBlu> If I build a circuit with a Radiometrix HX1 and I want to test it, with a radio within a couple feet, do I ned a load or antenna?
[14:14] <eroomde> no
[14:14] <Babs> Babs fact of the day: Abba records were that popular BITD that the rest of the world ran out of Swedish krone to pay the band, swedish record pressers etc. and instead had to pay them in oil.
[14:15] <fsphil> random cheetah photo of the day: https://secure.flickr.com/photos/frted/4850527905/
[14:16] <codrBlu> eroomde, do I not need a load because the output power is low enough? And the output pin on the HX1 will act as enough of an antenna by itself for such a short transmission?
[14:16] <eroomde> yes
[14:16] <codrBlu> Cool. Thanks.
[14:17] <eroomde> where yes is a vector of the right size to be type-compatible to your question, and each element of the vector is 'yes'
[14:17] <eroomde> and where i need to get out a bit more
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[14:18] <Babs> I'll see your Cheetah fsphil and raise you a cheetah I saw a while back just before the mother whupped some poor animal that was slower than it was http://www.flickr.com/x/t/0090009/photos/91049302@N00/6593530603/
[14:19] <fsphil> to be fair, almost every animal is slower than it
[14:20] <fsphil> great photo
[14:20] <Babs> I tell you though, they rest for hours after every little 70mph sprint. No stamina those wild animals.
[14:21] <fsphil> yea they seem to be lazy animals
[14:21] <Babs> ta. twas on a long lens.
[14:21] <eroomde> i think that's how humans hunted wasn't it
[14:21] <eroomde> they just jogged after the prey until the prey collapsed of exhaustion
[14:21] <SpeedEvil> it,s the opposite of that
[14:21] <eroomde> despite the prey often being much much faster in a sprint
[14:21] <SpeedEvil> cheetah are a sprint predator
[14:22] <SpeedEvil> humans exploited the jogging gait that's a very efficient speed range in us, and not in animals
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[14:23] <Babs> eroomde - apparently so - there is an interesting TED talk on it http://www.youtube.com/watch?v=1i5SAYBvCYk
[14:23] <Babs> i bl00dy love TED
[14:24] <codrBlu> Didn't we just use crossbows?
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[14:24] <Babs> George Dyson's one on his dad Freeman's atomic bomb powered spaceship is excellent.
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[14:25] <Babs> in addition to this awesome 3-minuter on rockets http://blog.ted.com/2008/02/27/steve_jurvetson/
[14:25] <SpeedEvil> http://m.youtube.com/#/watch?v=DkGMY63FF3Q&desktop_uri=%2Fwatch%3Fv%3DDkGMY63FF3Q
[14:26] <HixWork> Nice photos Babs
[14:26] <SpeedEvil> onion talks :-)
[14:28] <Babs> Thanks HixWork. It was an awesome place.
[14:29] <SpeedEvil> today, I saw a chaffinch.
[14:29] <SpeedEvil> it was also pretty.
[14:31] <HixWork> fsphil, STILL NO NEST IN BOX1?
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[14:31] <HixWork> ahh sodding caps lock, sorryt
[14:32] <HixWork> if only i could type [whilst looking at the screen]
[14:32] <fsphil> HixWork: I think the pair have abandoned it
[14:33] <HixWork> bugger
[14:33] <fsphil> yea. and the swifts are in the box already. I may not be able to get the cameras in
[14:34] <HixWork> double bugger
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[14:37] Nick change: MoALTz_ -> MoALTz
[14:40] <gonzo__> just drill a hole and mount it externally (wait for them to be out first, gets a bit splashy otherwise)
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[14:42] <fsphil> they're normally away during the day, might be able to get something installed
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[15:08] <HixWork> bug cam http://www.bbc.co.uk/news/science-environment-22372442
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[15:14] <Laurenceb> BOXI??/
[15:14] <Laurenceb> Oh HAI
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[15:57] <Lunar_Lander> hallo
[15:57] <Lunar_Lander> *hello
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[16:04] Nick change: Upu_ -> Upu
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[16:12] <Babs> Upu in the house
[16:13] <Lunar_Lander> hi Upu
[16:14] <Upu> just a reconnect
[16:14] <Upu> he's in a cottage in the Lakes atm :)
[16:14] <Lunar_Lander> how is it? :)
[16:14] <Upu> sunny actually
[16:15] <Upu> going to Coniston for tea shortly
[16:15] <Lunar_Lander> cool :)
[16:15] <Lunar_Lander> when you come back, you'll have a GPS order ;)
[16:15] <Upu> super :)
[16:15] <Upu> will be dispatched on Tuesday
[16:15] <Upu> right afk now
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[16:24] <Lunar_Lander> cool
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[16:49] <SpeedEvil> randomness.
[16:49] <SpeedEvil> https://www.google.com/url?sa=t&rct=j&q=elements%20of%20rocket%20propulsion&source=web&cd=1&ved=0CC4QFjAA&url=http%3A%2F%2Fweb.mit.edu%2Fe_peters%2FPublic%2FRockets%2FRocket_Propulsion_Elements.pdf&ei=15aCUaqpFcaHtAas1YBQ&usg=AFQjCNFfBlVhsAgn9BdlfnZIRK3-w4oBow&bvm=bv.45960087,d.Yms
[16:50] <SpeedEvil> copy of elements of rocket propulsion on the MIT website
[16:50] <SpeedEvil> I assume it must be legit somehow
[16:54] <eroomde> SpeedEvil: which edition?
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[16:57] <number10> 7th edition
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[17:02] Action: moriarty burps
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[17:07] <eroomde> maybe that's wy it's there
[17:07] <eroomde> there's an 8th ed now
[17:07] <eroomde> which has some nice improvements like a dedicated chapter on turbopumps
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[17:39] <SpeedEvil> :-)
[17:39] <SpeedEvil> I guess you need a copy for work.
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[17:44] <eroomde> yes, there are a few copies floating around here
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[17:53] <Lunar_Lander> what's Rocketlab?
[17:53] <Lunar_Lander> it's another book that the guy has on his MIT site
[17:55] <Lunar_Lander> ah designing rockets
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[18:19] Action: Geoff-G8DHE *
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[18:31] <Lunar_Lander> hi daveake
[18:31] <Lunar_Lander> short question if possible
[18:32] <Lunar_Lander> you have been using the NMEA output of the GPS so far all the times?
[18:33] <Lunar_Lander> my question is if that enables one to make a delay-free code
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[18:37] <daveake> yes and yes
[18:37] <daveake> brb food
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[18:48] <Lunar_Lander> hi NickB_
[18:48] <NickB_> hi Lunar
[18:48] <Lunar_Lander> how are you today?
[18:49] <NickB_> very good :)
[18:49] <Lunar_Lander> cool
[18:49] <Lunar_Lander> you are preparing an ascent, right?
[18:49] <NickB_> just got the pi code more or less ready
[18:49] <Lunar_Lander> yea
[18:49] <NickB_> yeah on the 25th
[18:49] <Lunar_Lander> :)
[18:50] <Lunar_Lander> did you hear that I flew on March 5 :)?
[18:50] <NickB_> ah yes yes
[18:50] <Lunar_Lander> :)
[18:50] <NickB_> saw it on the tracker
[18:50] <Lunar_Lander> cool
[18:50] <NickB_> everything went ok?
[18:51] <Lunar_Lander> yes, save for the landing in a river
[18:51] <Lunar_Lander> xD
[18:51] <Lunar_Lander> but we could retrieve it thanks to some workers who had a boat
[18:52] <NickB_> oh xD
[18:52] <NickB_> slow river?
[18:54] <NickB_> that reminds me of Tim's flight a long time ago
[18:54] <griffonbot> Received email: mclane "[UKHAS] Re: Launch Announcement PYSY5 - 4.5.2013"
[18:54] <NickB_> http://www.youtube.com/watch?v=3NrmeVZ1j8g
[18:54] <Lunar_Lander> yes, right in front of a barrage
[18:55] <Lunar_Lander> yeah the IJsselmeer
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[18:57] <NickB_> did you do a writeup of the flight?
[18:58] <griffonbot> Received email: Steve Aerospace "[UKHAS] Flight Announcements - Elsworth launch fest Sunday 5th May"
[18:58] <Lunar_Lander> working on it
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[18:59] <Lunar_Lander> there is a german writeup on the university site
[18:59] <NickB_> cool
[18:59] <NickB_> have a link?
[18:59] <Lunar_Lander> http://www.macromol.uni-osnabrueck.de/Glinka.php
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[19:08] <NickB_> looks to be a textbook flight :)
[19:08] <NickB_> except for the landing spot :)
[19:09] <Lunar_Lander> yeah :)
[19:09] <Lunar_Lander> and the late cutdown action
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[19:23] <fsphil> ooh lots of ssdv tests today
[19:23] <NickB_> thanks for the code fsphil! :D
[19:23] <NickB_> working great
[19:23] <fsphil> np
[19:24] <fsphil> who's testing MIZZOU?
[19:26] <Lunar_Lander> NickB_, still there?
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[19:31] <steve_____> Hello
[19:31] <fsphil> howdy
[19:32] <steve_____> I was having look at the Vortex flights today on the spacenear.us/tracker and was wondering how the green and blue circles are calculated, is it documented anywhere I can read?
[19:33] <steve_____> The flight was nice and close to home but unfortunately I was in not :(
[19:36] <Randomskk> steve_____: they're just 0 and 5 degree horizons from the current altitude and position
[19:36] <Randomskk> assuming a flat earth adn several other bodges iirc
[19:36] <Randomskk> I guess it doesn't assume a flat earth. that'd be stupid.
[19:36] <Randomskk> but anyway yea
[19:36] <steve_____> ok - thanks for that
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[19:43] <steve_____> is it calculated upside down or is 5 degrees the green circle, if there are two blue circles should I also assume 10 degrees is plotted - sorry for the stupid questions
[19:43] <mfa298> Randomskk: I assume the phrase you meant was that everywhere is at 0m ASL.
[19:44] <mfa298> steve_____: it's one pair of circles per balloon.
[19:44] <mfa298> if you hover over them it will tell you what they are.
[19:45] <steve_____> ah there was a secret ballon inside all those circles that became visible when I zoomed in :P
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[19:47] <SP9UOB_Tom> evening all
[19:47] <SP9UOB_Tom> ping x-f
[19:47] <x-f> evening, Tom
[19:49] <SP9UOB_Tom> hi x-f, little chhange of plans, 2nd baloon will be floater :-) So, can You mobilize Hams in Belarus' Lithuana, Estonia and european Russia :) ?
[19:49] <SP9UOB_Tom> im really dont know russian (we learned it at school but You know ;-)
[19:49] <fsphil> put up the HAB signal
[19:50] <x-f> gee, that's a lot for HAB-unexperienced folks :)
[19:50] <SP9UOB_Tom> x-f just make translation of http://ukhas.org.uk/guides:tracking_guide
[19:50] <x-f> i know Russian as much as i understand it, but i cannot write or talk in Russian
[19:51] <SP9UOB_Tom> anyway, antenna will be 5/8 lambda GP :-)
[19:52] <steve_____> I finally found a browser that told me what the circles were when I hovered ;)
[19:52] <SP9UOB_Tom> so signal at low angles should be strong
[19:53] <steve_____> go firefox!
[19:54] <Lunar_Lander> daveake, back from dinner?
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[19:58] <steve_____> wow 0-5 degrees is quite a difference in terms of size on the map - I would have expected it to be much closer to 0 than it is
[19:59] <x-f> SP9UOB_Tom, can't even recall anyone from my friends, who could translate to Russian language :/ Estonians know English well, i believe Lithuanians should too
[19:59] <x-f> there's always translate.google..
[19:59] <SP9UOB_Tom> x-f: so if You Can - please let them know :-)
[20:00] <x-f> do you have the prediction yet?
[20:00] <SP9UOB_Tom> x-f: novadays people are lazy, even to lazy to use google-translator
[20:00] <steve_____> I know a couple of Russians
[20:01] <steve_____> I can ask
[20:02] <x-f> that would be great, Steve
[20:02] <Lunar_Lander> I just tried to contact someone who lived in the USSR when he was like small
[20:02] <Lunar_Lander> but he is afk
[20:03] <SP9UOB_Tom> x-f: http://habhub.org/predict/#!/uuid=28008c4434357970fde1a320d5915f74502fbf7d
[20:03] <SP9UOB_Tom> x-f it shows the direction
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[20:04] <SP9UOB_Tom> over Belarus to northern russia
[20:04] <SP9UOB_Tom> if the wind dont change direction
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[20:26] <jcoxon> SP9UOB_Tom, have you got your wspr payload working yet?
[20:26] <Laurenceb_> https://www.utexas.edu/
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[20:30] <SP9UOB_Tom> jcoxon: no, it should be ready in a month
[20:32] <jcoxon> oh cool
[20:33] <SP9UOB_Tom> if i resolve low memory problem there be also SSTV :-)
[20:33] <Lunar_Lander> cool
[20:34] <SP9UOB_Tom> but i need decompress jpeg from camera
[20:35] <SP9UOB_Tom> SSTV transmission is simple just FSK - no problem with fast DDS
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[20:38] <fsphil> any ideas on how to get around the memory problem?
[20:39] <Lunar_Lander> what is the memory problem exactly?
[20:40] <fsphil> sstv needs decompressed image data, which takes up a lot of space
[20:41] <fsphil> or sstv sends data line by line, but jpeg doesn't provide it like that
[20:41] <SP9UOB_Tom> fsphil: sd-card and segmented operation, FRAM also
[20:41] <fsphil> so you need to buffer quite a bit of data
[20:41] <SP9UOB_Tom> fsphil: i have 16 kB in pic
[20:42] <steve_____> I have been trying to work it out and try as I might I still think the green circle is too far removed from the blue to be 0 and 5 degrees on the tracker. It looks more like 75 degrees to me&
[20:42] <SP9UOB_Tom> maybe its time to switch to PIC33 :-)
[20:42] <SP9UOB_Tom> fsphil: anyway pure old-fashioned SSTV would be cool :-)
[20:42] <fsphil> definitly
[20:43] <fsphil> you could store a row of jpeg data and decode it repeatedly until you've sent all the lines in it
[20:44] <SP9UOB_Tom> at this moment its only an idea - but if i have DDS onboard - why not do this ;-)
[20:44] <SP9UOB_Tom> i have house to build :-)
[20:44] <Lunar_Lander> ah
[20:45] <Lunar_Lander> do you know that LinkSprite camera?
[20:45] <SP9UOB_Tom> Lunar_Lander: have one
[20:45] <Lunar_Lander> ah
[20:45] <Lunar_Lander> It still pulls my hair
[20:45] <Lunar_Lander> xD
[20:45] <fsphil> it has no raw mode like the c328's sadly
[20:46] <fsphil> SP9UOB_Tom: if you're feeling really brave, you could capture a frame from the linksprite's analogue output
[20:46] <fsphil> play it back slowly over the radio
[20:46] <nigelvh> That sounds like a nightmare.
[20:46] <SP9UOB_Tom> fsphil: i dont have 6.5 MHz DAC :-)
[20:46] <fsphil> not good enough :)
[20:47] <SP9UOB_Tom> i was thinking about bandwidth :-)
[20:47] <fsphil> well if you played it back slow enough it wouldn't use any more than sstv
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[20:53] <SpeedEvil> steve_____: for it to be 75 degrees, it would need to be about the same diameter as height, it's not
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[20:55] <malgar> Hello
[20:55] <malgar> I'm searching balloons on ebay
[20:55] <malgar> I find only US sellers
[20:56] <SpeedEvil> why?
[20:56] <malgar> is there someone in europe?
[20:56] <SpeedEvil> Randomskk:
[20:56] <SpeedEvil> it is him isn't it?
[20:56] <malgar> where do you buy your ballons?
[20:57] <SP9UOB_Tom> http://randomsolutions.co.uk/Random_Aerospace/Balloons.html
[20:57] <chrisstubbs> Randomsolutions = Rocketboy
[20:57] <SpeedEvil> oops
[20:58] <chrisstubbs> Too easy to mix that one up haha
[20:58] <griffonbot> @NSEballoon: Launching CHEAPO again on 434.400 this Sunday with a better camera at approx 12:00 Elsworth, Cambridgeshire #UKHAS [http://twitter.com/NSEballoon/status/330063671868928004]
[20:58] <Laurenceb_> http://randomsolutions.co.uk/Random_Aerospace/News.html
[20:58] <Laurenceb_> very impressive
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[21:06] <Laurenceb_> http://diydrones.com/profiles/blogs/thirty-days-behind-the-scenes-at-3dr-may-2-iso9001-2008-certifica
[21:06] <Laurenceb_> ^funniest thing i read all day
[21:07] <malgar> how can I convert liters of compressed helium to expanded volume?
[21:07] <Dan-K2VOL> malgar, use the ideal gas law
[21:07] <Dan-K2VOL> PV=nRT
[21:07] <Dan-K2VOL> Wolfram alpha is a good way to play with it
[21:08] <malgar> Dan-K2VOL: yes but in the shop they don't say anything about the pressure
[21:09] <Dan-K2VOL> the pressure in the tanks are shown on a gauge you attach, but they sell them at a fairly standard pressure
[21:09] <Dan-K2VOL> in the USA it's around 2700PSI
[21:09] <malgar> ok
[21:10] <Dan-K2VOL> and they are selling you a volume of gas at STP, not the volume as it is in the cylinder
[21:10] <malgar> mmh
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[21:10] <malgar> ok
[21:10] <Dan-K2VOL> but here's a nice ideal gas law calc: http://www.wolframalpha.com/input/?i=ideal+gas+law+calculator
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[21:19] Nick change: heathkid|2 -> heathkid
[21:20] <griffonbot> @daveake: Remember my launch in a Cumbrian blizzard? Read all about it http://t.co/IpyaRnM7vi http://t.co/4tJWZCZBuQ #UKHAS #wreckmydress [http://twitter.com/daveake/status/330069204759883778]
[21:20] <heathkid> anyone around that's using trackunio code for APRS?
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[21:21] <Lunar_Lander> daveake, I ran a calculation today
[21:21] <Lunar_Lander> which made me wonder
[21:22] <Lunar_Lander> can I tell you about it?
[21:22] <daveake> made you wonder what?
[21:22] <daveake> go on
[21:22] <Lunar_Lander> ok
[21:22] <Lunar_Lander> I calculated the resistance of the cutdown wire we used on March 5
[21:22] <Lunar_Lander> I got about 1.7 ohms and thus a current of some 2.8 amps and some 14 W of power
[21:22] <Lunar_Lander> that sounded a bit strange to me
[21:23] <Lunar_Lander> (5 V of course)
[21:23] <daveake> You're forgetting something
[21:24] <Lunar_Lander> the resistance of the wires to the cutdown coil?
[21:24] <daveake> yes, and ....
[21:25] <Lunar_Lander> the outside temperature?
[21:25] <Lunar_Lander> or the MOSFET?
[21:25] <daveake> MOSFET
[21:25] <daveake> and ...
[21:25] <Lunar_Lander> the batteries themselves?
[21:25] <daveake> excellent :)
[21:25] <Lunar_Lander> :)
[21:26] <SP9UOB_Tom> just use supercapacitor AND power tyristhor :-)
[21:26] <Lunar_Lander> :P
[21:26] <SP9UOB_Tom> 120Amps :-)
[21:26] <daveake> briefly
[21:26] <Lunar_Lander> xD
[21:26] <fsphil> lightning cut-down
[21:26] <SP9UOB_Tom> charge it via reasonable R
[21:26] <Lunar_Lander> so we are actually losing a lot of power in all the different parts of the system
[21:27] <daveake> yes of course
[21:27] <Lunar_Lander> due to the voltage drops
[21:27] <Lunar_Lander> yea
[21:27] <SP9UOB_Tom> and - even if your batteries are almost dry - fire tyristhor
[21:27] <SP9UOB_Tom> 10Farads@2.7v is enough to burn :-)
[21:27] <Lunar_Lander> :)
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[21:30] <Lunar_Lander> I got salt+vinegar crisps :)
[21:30] <Lunar_Lander> tasty :)
[21:30] <SP9UOB_Tom> ...and You dont need thick cables to cutdown device
[21:30] <SpeedEvil> or just use a 1w resistor, on for a minute
[21:31] <Lunar_Lander> yea
[21:31] <Lunar_Lander> no I got normal wires to the device
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[21:32] <heathkid> 10 Farads @ 2.7V? isn't that a pretty large and heavy cap?
[21:33] <SP9UOB_Tom> heathkid: no, wait
[21:33] <Lunar_Lander> daveake, will try the resistor next
[21:33] <griffonbot> @daveake: Video for that snowy launch - http://t.co/Und3UeleuA #UKHAS #wreckmydress [http://twitter.com/daveake/status/330072544243748865]
[21:33] <daveake> Less fragile
[21:33] <Lunar_Lander> yea
[21:33] <SpeedEvil> or use a tantalumn cap, reversed, with the line round it so when it explodes the line falls off
[21:33] <Lunar_Lander> XD!
[21:34] <SP9UOB_Tom> http://www.tme.eu/pl/Document/87b5a54c88cdca0dc9dd909a3453c7c1/pc10_maxwell.pdf
[21:34] <SP9UOB_Tom> 6.3 gram
[21:34] <SP9UOB_Tom> 4.5A current
[21:35] <SP9UOB_Tom> burns nichrome wire to white :-)
[21:35] <Lunar_Lander> :)
[21:36] <SP9UOB_Tom> i also have this one: http://www.tme.eu/pl/Document/9e3718124448ceadb92957b639c872c1/DB_samwha.pdf
[21:36] <SP9UOB_Tom> tracker powered from it is working for about an hour :-)
[21:37] <SP9UOB_Tom> 300 farads
[21:37] <steve_____> *click* - is the 0-5 degrees the ground station look angle&.
[21:39] <Lunar_Lander> cool
[21:40] <steve_____> the statement when I hover over the circle says "5 degree horizon of BALLOON"
[21:40] <steve_____> so no :(
[21:40] <SpeedEvil> it's the same thing
[21:40] <SpeedEvil> draw it out
[21:40] <steve_____> http://showcase.netins.net/web/wallio/FOOTPRINT.html
[21:43] <heathkid> SP9UOB_Tom: *very* impressive specs on those caps!
[21:43] <heathkid> added to my *must try* list...
[21:44] <SP9UOB_Tom> heathkid: :-)
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[21:46] <heathkid> what size nichrome wire does everyone use?
[21:46] <heathkid> I've got a few different sizes
[21:46] <Dan-K2VOL> I use 28 or usually
[21:46] <Dan-K2VOL> 30
[21:46] <Dan-K2VOL> AWG
[21:46] <heathkid> I have some 28 AWG
[21:46] <Dan-K2VOL> wrapped in a coil around a pencil
[21:46] <heathkid> and some 16 AWG
[21:46] <Dan-K2VOL> the 16 will take too much current
[21:46] <heathkid> I know
[21:47] <heathkid> I use that for cutting things
[21:47] <heathkid> with a power supply at 5A+
[21:47] <heathkid> trying to pickup a power supply at work... 0-30V @ up to 30A
[21:49] <heathkid> I still can't figure out why my tracker running modified trackuino software works for others but not for me
[21:50] <heathkid> trying APRSIS32 which works but reports my position WAY off by about 30 miles
[21:50] <heathkid> using Soundmodem to decode packets
[21:50] <nigelvh> Did you figure out the bit I was saying before?
[21:51] <SP9UOB_Tom> heathkid: try mo modem :-)
[21:51] <SP9UOB_Tom> heathkid: try my modem :-)
[21:51] Nick change: junderwood_M0JCU -> junderwood
[21:51] <heathkid> not really... but like I said, it's working for others using the uBlox-6 as-is... but not for me
[21:51] <SP9UOB_Tom> its easy to build :-)
[21:51] <heathkid> my modem?
[21:51] <steve_____> drawing it out helps - it is obviously the same thing
[21:52] <SP9UOB_Tom> heathkid: instead of soundcard - my fancy aprs dsp modem :-)
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[21:52] <heathkid> ah
[21:52] <nigelvh> SP9UOB_Tom, it isn't a decode issue
[21:52] <SP9UOB_Tom> http://translate.google.pl/translate?sl=pl&tl=en&js=n&prev=_t&hl=pl&ie=UTF-8&eotf=1&u=http%3A%2F%2Fsp9uob.verox.pl%2Fdstnc.html&act=url
[21:52] <heathkid> I'd just like a simple sound card interface
[21:52] <nigelvh> He's got an encode issue.
[21:52] <SP9UOB_Tom> ahh ok
[21:53] <heathkid> but it works for other people and is accurate to within 10 feet
[21:53] <nigelvh> He's probably putting seconds where decimal minutes need to be
[21:53] <heathkid> not for me
[21:54] <nigelvh> heathkid, can you put your gps code on pastebin?
[21:54] <SP9UOB_Tom> night all
[21:54] <Dan-K2VOL> night
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[21:59] <heathkid> gps.cpp = http://pastebin.com/U2ZLpqmy
[21:59] <heathkid> gps.h = http://pastebin.com/yGB7iyNf
[22:06] <nigelvh> heathkid, what are the GPS positions you're getting, and what are you expecting to get?
[22:13] <Lunar_Lander> daveake, so what Tom said
[22:13] <daveake> sorry?
[22:13] <Lunar_Lander> I could charge the ultracap via a resistor and then discharge it through the MOSFET?
[22:13] <Lunar_Lander> he linked to that datasheet earlier
[22:14] <daveake> if you want
[22:14] <Lunar_Lander> yea
[22:14] <Lunar_Lander> hm
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[22:16] <steve_____> and there is the other side of the maths I was missing http://www.mathcaptain.com/trigonometry/angle-of-elevation-and-depression.html
[22:16] <steve_____> its too late - going to bed :)
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[00:00] --- Fri May 3 2013