highaltitude.log.20080216

[00:02] <Laurenceb> ooh 50Mhz
[00:02] <Laurenceb> wonder if thats legal...
[00:02] <Laurenceb> it would boost the range :P
[00:03] <Laurenceb> maybe over the horizon...
[00:03] Action: Laurenceb looks up plasma frequencies
[00:04] <defy> whats up Laurenceb, hows it going?
[00:04] <Laurenceb> hey defy
[00:04] <Laurenceb> havent met you before :P
[00:05] <defy> we've spoken here before
[00:05] <Laurenceb> you want to launch a higher powered tx?
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[00:05] <Laurenceb> I'm trying to remember... :P
[00:06] <defy> I have a uav project I completed, but never dropped from a balloon, I started helicopter pilot training and thats been taking up my time
[00:06] <Laurenceb> cool
[00:06] <Laurenceb> where are you based?
[00:06] <defy> new zealand
[00:07] <Laurenceb> oh yes
[00:07] <Laurenceb> gumstix and IR based?
[00:07] <defy> yup
[00:07] <Laurenceb> my rogallo was launched over christmas, but suffered some problems
[00:08] <Laurenceb> it worked well in tests (after a lot of fiddling about)
[00:08] <defy> oh yea, i remember you doing tests with those, how did it go
[00:08] <Laurenceb> well I eventually got it gliding well and lining up on target
[00:08] <Laurenceb> used my balcony at uni (its on the 3rd floor)
[00:09] <Laurenceb> the maiden drop test is on google video
[00:09] <Laurenceb> http://video.google.co.uk/videoplay?docid=-697132647433445052
[00:11] <Laurenceb> it went into a spiral on the drop test from the balloon, and the flight computer kept dropping out, I think the switched mode supply didnt like the low temperature, and the optocouplers driving the servo drifted a bit
[00:12] <defy> how high did you drop it from?
[00:12] <Laurenceb> the firmware seemed to be working fine, but the servo wasnt responding. The voltage swing out to the servo wasnt in spec
[00:12] <Laurenceb> and at -20c it would have been worse
[00:12] <Laurenceb> 4Km
[00:13] <Laurenceb> what do you think of that drop test?
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[00:14] <defy> wow pretty high, test looks already, did you actually start the motor on that test or just let it glide?
[00:14] <Laurenceb> just a glide
[00:15] <Laurenceb> we found the motor changes the performance so much its not useful for evaluating the guidance
[00:15] <Laurenceb> it can help in getting it to altitude, but its hard to fly , and even harder to launch by hand using the motor
[00:15] <defy> true, have you ever considered a glider airframe?
[00:16] <defy> a rigid one i mean
[00:16] <Laurenceb> yes, but not as stable when gliding
[00:16] <Laurenceb> that thing is a real pain to hand launch, you need just the right attitude and velocity or it will stall like in the video
[00:16] <defy> that all depends on the glider design really..theres a guy down south who's done balloon drops with a glider thats rudder controlled only
[00:17] <Laurenceb> I know, but its not my area of expertise
[00:18] <defy> I see, are you going to continue trying?
[00:18] <Laurenceb> maybe, but with a larger wing on that airframe, so I can use it as a uav
[00:18] <Laurenceb> http://wiki.ukhas.org.uk/projects:ukhas_glider_project:airframe
[00:19] <defy> sweet
[00:20] <Laurenceb> I may swap the wings for something larger (they just bolt on /off with some M3s)
[00:20] <Laurenceb> then it will be a lot easier to fly under power, and make a good uav
[00:21] <Laurenceb> I guess for someone with more experience the present version would be good (it handles like a jet :D )
[00:22] <defy> cool, they look interesting
[00:23] <Laurenceb> but using the wings off the prototype or similar it will be more "user friendly"
[00:23] <Laurenceb> where did you get your thermopiles?
[00:24] <Laurenceb> http://video.google.co.uk/videoplay?docid=7102390356456733483
[00:24] <Laurenceb> ^ onboard the prototypee
[00:29] <Laurenceb> I've been working on our own thermopile system - http://wiki.ukhas.org.uk/projects:ukhas_glider_project:components
[00:31] <defy> cool, thats become a bit of a problem with the ones i use, the company that used to make them doesn't sell them any more
[00:31] <Laurenceb> theres chartland electronics in the UK
[00:32] <Laurenceb> the lab I'm working in at uni has some perkin elmer ones
[00:32] <defy> just sensors or the whole units?
[00:33] <Laurenceb> sensors
[00:33] <Laurenceb> I can post you some of those boards if you want?
[00:33] <defy> http://www.uavs.net/ir-instructions.html these are the ones i have
[00:34] <Laurenceb> ah yes, seen those
[00:34] <Laurenceb> my design uses an spi adc to reduce EMI
[00:34] <defy> sweet
[00:34] <Laurenceb> I've assembled one board, but havent had time to test it yet
[00:34] <defy> what does it cost to put a 2 axis sensor together using your design?
[00:35] <Laurenceb> about £25
[00:35] <defy> sweet, not bad
[00:36] <Laurenceb> I could spare one or two bare boards if you want
[00:36] <Laurenceb> unfortunately the power supply is a bit silly, if I put through another order I would change the position of the inductor, but its not going to have a big effect
[00:36] <defy> I still have a few of those sensor boards so i should be okay for now, thanks though....i might be in need in the future if i lose/destroy any of the ones i have
[00:37] <Laurenceb> minor oversight
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[00:44] <Laurenceb> I'm trying to work out if 50Mhz is legal...
[00:56] <Laurenceb> hmm maybe 40.6640.70 MHz
[01:16] <Laurenceb> it looks complicated, I might email ofcom and see what they say
[01:16] <Laurenceb> its an ISM band, but they specifically say 434Mhz for airborne telemetery, so I dont know
[01:20] <Laurenceb> haha http://www.youtube.com/watch?v=BhrxTHqGDI4
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[01:42] <Laurenceb> so are you planning anythin g high altitude dfy?
[02:33] <defy> not sure yet, I've just gotten all my gear out of storage and looking through it all today
[02:33] <defy> I need to make a better platform to holding all the electronics in my glider, its all kinda ghettod together at the moment
[02:34] <Laurenceb> :P
[02:34] <Laurenceb> I'm working on a balloon project for uni
[02:34] <defy> but the internals all work, I had the glider in a holding pattern for 15 minutes with the motor going full throttle
[02:34] <defy> so if i drop from a balloon and glide 99% of the way to where it needs to be, it should be able to get it to land pretty accuately
[02:35] <Laurenceb> cool
[02:35] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol
[02:35] <Laurenceb> so this is wall with basic pitch null offsetting?
[02:36] <defy> I saw that video of the piston etc, was wondering what it all was
[02:36] <Laurenceb> for collecting aerosol samples :P
[02:37] <Laurenceb> the audio is funny :D
[02:38] <Laurenceb> I'm running fldigi on linux for the receiver
[02:41] <defy> sweet
[02:58] <Laurenceb> but at the moment it doesnt work :(
[02:58] <Laurenceb> "sound error: unanticipated host error"
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[10:22] <jcoxon> morning all
[10:22] <jcoxon> mc-, you reinspired me to work on my robot
[10:23] <jcoxon> have now got hime working wirelessly
[10:27] <mc-> wow thats quick
[10:27] <mc-> wish I could make progress like that
[10:28] <jcoxon> oh
[10:28] <jcoxon> i had already interfaced him with an arduino
[10:28] <jcoxon> then i just fixed a radiomodem set i have
[10:28] <mc-> which radios do you use?
[10:29] <jcoxon> aerocom 4868-250M
[10:29] <jcoxon> 868mhz
[10:29] <jcoxon> i got them for ballooning before i knew you couldn't use them
[10:29] <mc-> would they work for an uplink? what range?
[10:30] <jcoxon> in theory yeah they would work
[10:30] <jcoxon> but i'm less sure about the range
[10:31] <jcoxon> surely HAM radio is the way to go with the superior power
[10:33] <mc-> maybe, I got my 50MHz transceiver today, 10W power.
[10:34] <jcoxon> oh these modems are only 250mW
[10:37] <mc-> http://www.alltronics.com/cgi-bin/category.cgi?item=92A067&type=&category=search I found these receivers
[10:37] <mc-> at 5 quid each, it doesn't matter if the balloon is lost
[10:39] <jcoxon> that is cool
[10:39] <mc-> they give a full schematic for it as well
[10:39] <jcoxon> :-)
[10:40] <jcoxon> you should do a test payload which just repeats back data that you send down 434
[10:40] <mc-> it will be cool, when I can get it to fire the cutdown from 100miles away...
[10:42] <mc-> and even better if I can send steering commands so a glider lands back at the launch spot
[10:42] <jcoxon> :-)
[10:42] <mc-> that would change the whole hobby
[10:42] <jcoxon> indeed it would
[10:42] <jcoxon> it would force me to go and actually get my licence
[10:43] <jcoxon> grrr now i need to sort out level shifting to get the radio link back from the robot to the 'puter
[10:43] <jcoxon> as the modem is 3.3v and arduino 5v
[10:44] <mc-> you shouldn't need to bother, or do you need to invert the signal?
[10:44] <jcoxon> the modem doesn't like 5v
[10:44] <jcoxon> its fine modem -> arduino
[10:44] <jcoxon> but arduino -> modem = bang me thinks
[10:44] <mc-> I see, just 2 resistors needed
[10:45] <jcoxon> yup
[10:45] <jcoxon> but i have to take apart the cool backpack he has
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[10:54] <mc-> do you know anyone who can build me a chassis for my robot? I guess you don't have time.
[10:56] <jcoxon> ed,oore is the person who would know
[11:09] <jcoxon> oooo now i've got 2 way comms
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[11:28] <mc-> yes, I need to contact Ed, I've got some good news for him..
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[13:42] <Hiena> Good afternoon!
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[21:13] <Laurenceb> hey guys
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[22:05] <mc-> Hi Laurenceb
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[23:37] <Laurenceb> lol theres a shared music folder on our network called "administrators library"
[23:37] <Laurenceb> clearly not to keen on stopping filesharing :D
[23:52] <Laurenceb> http://www.youtube.com/watch?v=ReRWOblLscM&NR=1
[00:00] --- Sun Feb 17 2008