highaltitude.log.20081215

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[00:13] <natrium42> edmoore
[00:14] <edmoore> yo
[00:14] <edmoore> only here briefly i'm afraid
[00:15] <natrium42> gah
[00:19] <edmoore> early start tomorrow!
[00:19] <edmoore> night
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[05:20] <natrium42> :D
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[08:05] <jcoxon> morning natrium42
[08:06] <jcoxon> i was summoned
[08:07] <natrium42> yay
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[11:42] <dh> Hi
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[12:02] <edmoore> hi dh
[13:02] <rjharrison_> Still happy at not having to shape my pulse :)
[13:02] <rjharrison_> Afternoon all
[13:08] <edmoore> :p
[13:12] <gordonjcp> rjharrison_: I'm not the kind of person to say "I told you so" but... ;-)
[13:32] <rjharrison_> gordonjcp: Cool
[13:32] <rjharrison_> No I agree no point wasting time if i don't need too
[13:33] <rjharrison_> I may have a play with the DAC to see if i can get an improvement
[14:10] <rjharrison_> On the off chance that someome may be interested here is the rtty audio @ 1200Baud 170HzShift 7Bit ASCII and you have to turn off AFC as it wont work. Place the FC either side of the peak and hey presto...
[14:10] <rjharrison_> http://www.robertharrison.org/images/icarus/rtty/Icarus-rtty-1200-ASCII7.wav
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[14:39] <gordonjcp> rjharrison_: I'll take a look at that once the laptop has charged
[14:39] <gordonjcp> ;-)
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[17:34] <rjharrison_> Hi edmoore, any idea where master coxon has vanished to?
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[17:40] <edmoore> rjharrison_: i think he has exams
[17:45] <rjharrison_> Cheers ed.
[17:46] <rjharrison_> BTW Missed the scope went for £623 in the end. Thinking about getting a OWON scope instead for about 270 pounds
[17:47] <edmoore> not suprise3d it went
[17:47] <rjharrison_> I may have to convince myself that we need a scope for work :)
[17:48] <rjharrison_> You'll have access to all the toys at uni.
[17:48] <edmoore> uni has its fair shair of toys, it must be said
[18:04] <rjharrison_> edmoore do you think it's worth playing with the dac to shape the pulse?
[18:04] <edmoore> if you want to do pulse shaping
[18:04] <edmoore> it's no harder than using pwm
[18:04] <edmoore> or easier
[18:05] <rjharrison_> Well I only want to shape the pulse if I need too. If I can get 300 miles rtty out of it at 50 Baud then I don't really care for the shaping
[18:05] <edmoore> guess you've answered your own q then :)
[18:05] <rjharrison_> I guess that's the acid test
[18:06] <rjharrison_> Can I get 300 miles rtty out of the bugger
[18:06] <rjharrison_> I feel a test launch comming on
[18:07] <rjharrison_> Best do it from camb
[18:07] <edmoore> yep
[18:08] <edmoore> could even sacrifice a beacon
[18:08] <edmoore> that's nice to do
[18:08] <edmoore> because a)
[18:08] <edmoore> you can try for an alt record with 2m/sec ascent
[18:08] <edmoore> b) tracking involves the eng department balcony, deck chairs and a beer
[18:09] <rjharrison_> Yep sounds good. Ok there will be a headless launch over xmas
[18:09] <rjharrison_> Ie NO Cam
[18:09] <rjharrison_> I have a spare 500g
[18:09] <edmoore> headless?
[18:09] <rjharrison_> No camera
[18:09] <edmoore> oh i see
[18:09] <edmoore> yeah
[18:10] <edmoore> pah, not going to get anywhere on 500g :P
[18:10] <rjharrison_> eyeless if you like
[18:10] <edmoore> worth a 1kg :)
[18:10] <rjharrison_> I'm not so sure given that the balloon will be very under filled 50%
[18:11] <edmoore> we once only just cleared churchill college roof
[18:11] <edmoore> having launched 300m into a field
[18:11] <rjharrison_> Beacon will weigh in at aproximately 120g inc batteries
[18:11] <edmoore> that was a bad day
[18:11] <edmoore> nova 2
[18:12] <rjharrison_> Perhaps bung on an IQ for good measure
[18:12] <edmoore> worth it
[18:12] <rjharrison_> And a bigger balloon.
[18:12] <rjharrison_> 1KG
[18:13] <rjharrison_> Worth it with the GPS
[18:13] <rjharrison_> Perhaps we can get it sent back from the neatherlands
[18:13] <edmoore> can do it on a slightly windier day too
[18:14] <rjharrison_> Yep wind is not going to be an issue for this one
[18:14] <rjharrison_> Unless it blows my radio signals arund
[18:14] <rjharrison_> around
[18:14] <rjharrison_> :)
[18:14] <edmoore> well it's specifically a range test
[18:14] <edmoore> so you wanna get some range off it
[18:14] <rjharrison_> Yep
[18:15] <rjharrison_> Rtty & CW at different rates
[18:16] <rjharrison_> 50,100,300,1200 BAUD and 10, 20, 30, 100 WPM
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[18:17] <rjharrison_> Would you guys be prepared to launch it for me If I sent all the kit down
[18:17] <rjharrison_> I will 90% come
[18:17] <edmoore> I probs wouldn't have any objections
[18:17] <edmoore> would have to ask the others, but fine by me
[18:17] <rjharrison_> But just in case i can't get a pass.
[18:18] <rjharrison_> have to dash
[18:18] <rjharrison_> back on when i get home
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[19:21] <edmoore> There's a scary resemblance between Carol Thatcher and Grayson Perry.
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[19:51] <natrium42> hi rjharrison
[19:51] <rjharrison> Hi natrium42
[19:52] <rjharrison> How's it going
[19:52] <natrium42> good
[19:52] <natrium42> ordered another gumstix today
[19:52] <rjharrison> Did you get my message yesterday on getting rtty to work with the avr
[19:52] <natrium42> should get it tomorrow
[19:52] <rjharrison> ooh
[19:52] <rjharrison> Did the other one die or do you need 2
[19:53] <natrium42> yeah, i am using the older one for a non-balloon project
[19:53] <rjharrison> I'm still playing with AVR's to be truthfull
[19:53] <rjharrison> A bit cheaper than the gumstix though I do have one
[19:54] <rjharrison> I'v never got to grips with the new biuld environment
[19:54] <natrium42> yah, avr is more than enough for most things
[19:55] <natrium42> so you got pulse shaping to work too?
[19:55] <rjharrison> No I got the tx'ing working at 1200 baud and I can't belive that I need pulse shaping if it works at that speed
[19:57] <rjharrison> I could be wrong.
[19:57] <rjharrison> Do you have an ocilloscope
[19:57] <natrium42> ooh, neat
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[19:58] <natrium42> yeah, it's a scope and LA in one
[19:58] <rjharrison> la?
[19:58] <natrium42> http://natrium42.com/gallery2/v/misc/la/
[19:58] <natrium42> logic analyzer
[19:58] <natrium42> got it quite cheap too
[19:58] <natrium42> with built in touchscreen and computer
[19:59] <rjharrison> That looks good
[19:59] <natrium42> yeah, $600 or so
[19:59] <natrium42> :)
[19:59] <rjharrison> I need one of those well a scope at any rate
[19:59] <rjharrison> I think an ebay purchase is needed
[19:59] <natrium42> yep, they are very useful for pwm debugging, for example
[19:59] <natrium42> to check what the actual pulses look like
[20:37] <rjharrison> natrium42 would you agree if I can send rtty at 1200baud ok then there is probably no need to pulse shape at 100baud?
[20:39] <natrium42> i am no radio expert, but sounds right...
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[20:46] <natrium42> hi Laurenceb
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[20:47] <jcoxon> evening all
[20:47] <Laurenceb> hi
[20:47] <natrium42> hey jcoxon
[20:47] <jcoxon> http://www.pegasushabproject.org.uk/track/
[20:48] <jcoxon> :-p
[20:48] <jcoxon> crap we are off
[20:48] <jcoxon> on the train
[20:48] <jcoxon> byeeeeeeee
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[20:48] <natrium42> ooh
[20:51] <natrium42> whoa
[20:52] <natrium42> i didn't know it also worked on edmoore
[20:54] <rjharrison> haha
[20:55] <Laurenceb> waz happening?
[20:55] <rjharrison> hey it works on you too
[20:55] <natrium42> but i didn't get any emails
[20:55] <Laurenceb> zeusbot is becoming self aware
[20:56] <Laurenceb> we must kill him before its too late
[20:56] <Laurenceb> satan@hell.com
[20:56] <Laurenceb> http://www.hell.com
[20:56] <natrium42> more like
[20:56] <natrium42> satan@microsoft.com
[20:56] <Laurenceb> lol
[20:56] <rjharrison> lol
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[22:35] <natrium42> edmoore, \o/
[22:35] <edmoore> yo
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[23:45] <edmoore> hi rjharrison
[23:53] <rjharrison> Hi ed
[23:53] <rjharrison> U still there
[23:54] <rjharrison> I have to conceed I'm quite convinced rtty is better than CW for tx'ing
[23:54] <edmoore> welcome to the other side
[23:55] <edmoore> it's just a more suitable protocol for this kind of thing
[23:55] <rjharrison> Yep I like my cw and it did seem to do well but rtty has a reference between the 1's and 0's
[23:56] <edmoore> the thing you will notice is -
[23:56] <edmoore> you start hearing rtty in white noise
[23:56] <rjharrison> i'm finding 434.075 a lot more noisy than 650
[23:56] <edmoore> your brain plays hugely massive tricks on you
[23:56] <akawaka> lot easier to build a tx for cw though
[23:57] <rjharrison> I'm not sure the only extra bit I needed was 1 resistor
[23:57] <edmoore> i think eh means build the tx
[23:57] <edmoore> rather than buy the tx and interface it with a microcntroller
[23:57] <rjharrison> :)
[23:57] <rjharrison> Why would you want to do that
[23:58] <edmoore> for the love of it
[23:58] <akawaka> well
[23:58] <akawaka> not really
[23:58] <rjharrison> I'm going to build a tx but not for ballooning just to help me understand radio
[23:58] <akawaka> you guys are very limited on the bands you can use, so you can easily buy commercial modules for that
[00:00] --- Tue Dec 16 2008