highaltitude.log.20080211

[00:00] <Laurenceb> quite a beast, but I'm sure something like that can be made with a few ICs
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[07:41] <Laurenceb> hello
[07:41] Action: Laurenceb has ordered some AD5521 samples
[07:42] <Laurenceb> it will make a cool preamp for a yagi
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[07:49] <Laurenceb> hey ed
[07:52] <Laurenceb> I've ordered some AD5521 samples, 12dB 0.5dB noise LNA :P
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[08:21] <Laurenceb> hey jcoxon
[08:21] <Laurenceb> hard luck yesterday
[08:21] <jcoxon> oh well
[08:21] <jcoxon> someone might find it
[08:21] <Laurenceb> :(
[08:22] <Laurenceb> hopefully
[08:22] <jcoxon> it has my name and number on the camera box
[08:22] <Laurenceb> it had a camera?
[08:22] <jcoxon> yeah
[08:22] <Laurenceb> cool
[08:22] <jcoxon> we added a second payload
[08:22] <jcoxon> i made it on sat
[08:23] <jcoxon> very simple trigger circuit taking pictures every 20sec
[08:23] <jcoxon> http://www.rlproject.com/launch_feb_2008/
[08:23] <Laurenceb> 555?
[08:23] <jcoxon> yup
[08:23] <Laurenceb> whats rlprojct?
[08:24] <jcoxon> doug came along and took some pictures
[08:24] <Laurenceb> cool is that fnoble?
[08:25] <Laurenceb> http://www.rlproject.com/launch_feb_2008/IMG_1242.JPG
[08:25] <jcoxon> yup
[08:25] <Laurenceb> wow nice launch
[08:26] <Laurenceb> hats a m4v file?
[08:26] <jcoxon> was an amazing launch
[08:27] <Laurenceb> ah i see
[08:28] <Laurenceb> itunes can play it
[08:29] <Laurenceb> that location looks familiar :p
[08:30] <Laurenceb> I've been looking into preamplifiers, AD make some very nice ones
[08:30] <jcoxon> my laptop died when i got home
[08:30] <jcoxon> wasn't a great day
[08:30] <Laurenceb> nooo
[08:31] <Laurenceb> properly died?
[08:31] <jcoxon> well i started having funny graphic problems in the afternoon
[08:31] <jcoxon> and now it won't turn on and the fan goes made
[08:31] <jcoxon> mad*
[08:31] <Laurenceb> :(
[08:32] <jcoxon> the logic board has gone
[08:32] <Laurenceb> not good
[08:33] <Laurenceb> I sampled two of the AD low noise amplifiers, so I could put them on a yagi
[08:33] <Laurenceb> should give about 5 times the range
[08:34] <Laurenceb> but we already have enoguht therefor it means
[08:34] <Laurenceb> more bandwidth :-) :-)
[08:35] <Laurenceb> can you repair your laptop?
[08:37] <jcoxon> apparently but with a blow torch
[08:37] <jcoxon> basically its a common fault
[08:37] <jcoxon> need to reflow the BGA graphics chip
[08:42] <Laurenceb> cool
[08:42] <Laurenceb> stupid bga
[08:43] <Laurenceb> right, time for me to get some breakfast
[08:43] <Laurenceb> talk to you later
[08:44] <Laurenceb> get edmoore to help out, he has a hot air kit :P
[08:44] <Laurenceb> cya
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[14:46] <Laurenceb> hi all
[14:47] Action: Laurenceb has been range testing the radio
[14:47] <Laurenceb> missing 8 decibels somewhere.....
[14:48] <Laurenceb> also fldigi was being weird, had to keep adjusting the sound card
[14:48] <Laurenceb> I strongly suspect this sound card doesnt have a crystal, but an RC oscillator
[14:48] <Laurenceb> it is shite
[14:49] <Laurenceb> we tested it from the park to the roof of the physics dept, a kilometer or so, then added 40dB attenuation
[14:50] <Laurenceb> omnidirectional antenna at both ends
[14:52] <Laurenceb> from here - http://maps.google.com/?ie=UTF8&ll=51.765025,-1.251047&spn=0.00579,0.020084&t=h&z=16&om=0
[14:53] <Laurenceb> to here - http://maps.google.com/?ie=UTF8&ll=51.759236,-1.255757&spn=0.000724,0.002511&t=h&z=19&om=0
[14:56] <Laurenceb> theres a huge building in the way- easily explains the -8dB
[14:58] <Laurenceb> bbl
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[16:15] Nick change: laurence__ -> Laurenceb__
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[17:13] <Laurenceb__> hi ed
[17:16] <edmoore> hi laurence_
[17:16] <edmoore> laurence, you are on here 3 times
[17:16] <edmoore> sort it out!
[17:16] <Laurenceb__> cant get gpio working :(
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[17:17] <Laurenceb> gpio doesnt work :(
[17:17] <Laurenceb> enabled is always set to zero
[17:17] <Laurenceb> I can write 1 to the file and its 0 when I read it
[17:18] <Laurenceb> http://www.avrfreaks.net/wiki/index.php/Documentation:NGW/NGW100_Switched_Input#For_Reference
[17:21] <Laurenceb> right back to ssh to faff
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[17:44] <Hiena> Good evening!
[17:44] <edmoore> hi jcoxon
[17:44] <edmoore> hi Hiena
[17:44] <Hiena> How are you?
[17:44] <Hiena> Any news from the weekend launch?
[17:53] <edmoore> nope
[17:53] <edmoore> lost
[17:53] <edmoore> unless someone finds whilst walking the dog
[18:00] <jcoxon> hey edmoore
[18:01] <jcoxon> yeah i hope that the mobile number is visible!
[18:07] <jcoxon> amazing
[18:07] <jcoxon> i just fixed my latop
[18:07] <Hiena> edmoore, how was the downstream?
[18:07] <Hiena> Any useable data?
[18:08] <jcoxon> (it died last night with the ibook logic board curse)
[18:08] <Hiena> It was a glider drop or just a container?
[18:09] <jcoxon> twas a container
[18:09] <jcoxon> there was some data, but suprisingly little
[18:09] <jcoxon> morse isn't the best method of transmitting in hindsight
[18:09] <jcoxon> well computers reading morse isn't great
[18:09] <jcoxon> if i was proficient in doing it myself then perhaps
[18:10] Action: Hiena nods.
[18:10] <Hiena> What was the last altitude and coordinates?
[18:12] <jcoxon> let me check
[18:14] <jcoxon> the last alt was 22021.5m
[18:15] <Hiena> And the coordinates? Is the GPS worked there?
[18:17] <jcoxon> one sec, still recovering my laptop
[18:20] <Hiena> Well. If you have the flight curve up, you could interpolate the possible dropsites. Best idea to start from the last coordinates. If you have some sink datas, at the end, it would be good sign.
[18:20] <jcoxon> yeah
[18:20] <jcoxon> whats irritating is that i don't have good timestamping
[18:20] <jcoxon> so i'm struggling to calculate the ascent rate
[18:21] <Hiena> It's unnecessary. At the good case you could calculte about 2 km radius the dropsite.
[18:22] <jcoxon> the last point on my log is 5215.7581 00001.0
[18:24] <jcoxon> however the coord before that is a bit broken but could be disintangled to be 5215.3549 00001.4
[18:25] <jcoxon> which doesn't totally fit in with the path
[18:26] <jcoxon> of those long cords are W
[18:26] <jcoxon> i'll put together a kml later on with the coords i can decode
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[18:34] <Hiena> Is it near to the Great Eversden?
[18:35] <jcoxon> what is?
[18:35] <jcoxon> the last coords?
[18:35] <Hiena> One before the last.
[18:36] <jcoxon> its over Bar Hill
[18:38] <Hiena> I'm trying to locate it on the google maps.
[18:39] <jcoxon> do 52 15.3549N 00 001.4
[18:39] <jcoxon> W
[18:43] <Hiena> Ok. Could you gives me the start location end the second point before the last one?
[18:45] <Hiena> Khm...and... Also I need the time of between the last 100 meters ascend.
[18:45] <Hiena> It was timed drop, or you are waited for the burst?
[18:45] <jcoxon> well we watched it all the way to the top
[18:45] <jcoxon> it appeared to cutdown as planned
[18:45] <jcoxon> which was at 23000m
[18:46] <Hiena> Ok. That is a good news.
[18:46] <Hiena> Is the chute was deployed?
[18:46] <jcoxon> it was predeployed
[18:47] <jcoxon> so i assume so - its quite hard to see :-D
[18:47] <jcoxon> what format do you want these coords in?
[18:47] <edmoore> Doug reckons he say it through the binos
[18:49] <Hiena> Anykind, format. i want to make the rough calculation for the average windspeed and direction. Also ai want to check the accurancy the last coordinates.
[18:50] <Hiena> Do you have any descent datas?
[18:50] <jcoxon> so launch was
[18:51] <jcoxon> 52 15.1109N 00005.5293W
[18:51] <jcoxon> the last 2 coords in order are:
[18:52] <jcoxon> 52 15.3549N 00 001.4W
[18:52] <jcoxon> 52 15.7581N 00 001.0W
[18:53] <jcoxon> i don't know the time between
[18:53] <jcoxon> however we can work it out :-p
[18:54] <Hiena> Give me about another four point before the last one.
[18:54] <jcoxon> thats going to take time
[18:54] <jcoxon> i'm extracting them from the garbage that is the radio log file
[18:56] <Hiena> Ok.
[18:58] <Hiena> Also, i need the time of the start and the connection lost.
[18:58] <Hiena> Or at least the time interval between the two event.
[18:58] <jcoxon> edmoore, can you get the launch time off your camera
[18:59] <edmoore> no
[18:59] <edmoore> but it was 11.12
[19:00] <jcoxon> i saved my logfile at 12.06
[19:03] <jcoxon> so 23000m in 54mins
[19:03] <jcoxon> so 425m per min
[19:04] <edmoore> wow
[19:04] <edmoore> 30kph
[19:04] <jcoxon> too fast?
[19:04] <edmoore> not too fast
[19:04] <edmoore> but fast
[19:04] <edmoore> actually, that is pretty fast
[19:05] <jcoxon> i've extracted 22021.5 as an alt about 3 readings before we lost contact
[19:08] <Hiena> Ok. Seems like it went totally about 2.5 miles. Hmmm...Not so strong wind.
[19:09] <jcoxon> Hiena, it was amazing weather
[19:09] <jcoxon> we watched it to 23km alt
[19:09] <Hiena> How much was the weight of the container, and how much was the parachute size?
[19:10] <jcoxon> the payload weighed just under 400g
[19:10] <jcoxon> and the parachute was...
[19:10] <jcoxon> edmoore, ?
[19:10] <jcoxon> can't remember
[19:10] <edmoore> me neither
[19:10] <jcoxon> 24?
[19:11] <jcoxon> inches that is
[19:11] <Hiena> Diameter or radius?
[19:12] <jcoxon> radius
[19:12] <Hiena> Is it has chimney or other holes?
[19:13] <jcoxon> it has quite a large spill hole
[19:13] <Hiena> Ayve...
[19:24] <Hiena> Ok. I have a kind of bad news. If i'm righ, the estimated descent rate is 27 m/s.
[19:25] <Hiena> With the parachute.
[19:26] <jcoxon> oh dear
[19:27] <Hiena> And this is the low altitude descent rate.
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[19:29] <jcoxon> Hiena, really?
[19:29] <jcoxon> thats very high
[19:29] <jcoxon> for a 0.4kg payload
[19:30] <jcoxon> to get a nice descent speed you'd need a parachute of about 0.6m diameter
[19:30] <jcoxon> according to the wiki's parachute sizing chart
[19:30] <Hiena> I used the v=sqrt(2F/cd*ro*S)
[19:32] <Hiena> Sorry, my bad. It's not 400N just 4N.
[19:33] <Hiena> No. 40N Grrr... I'm to tired for the basic math....
[19:35] <Hiena> Ok. 2,7m/s sounds better.
[19:35] <jcoxon> :-)
[19:37] <Hiena> If the release was good, the total droptime is 142 miutes.
[19:39] <jcoxon> what parachute size did you use?
[19:39] <Hiena> 24 inch radius.
[19:41] <Hiena> The calculation is kind of simple. The F is the weigh in Newton, the cd is a drag coeficient which is 0.75 for the round parachute, ro is the air density which is 1.225 kg/m^3, S is the surface of the used material.
[19:42] <Hiena> The surface is square meter.
[19:44] <Hiena> For the english calculation, the F is pound, ro=0.00211 sl/ft^3, S is square feet, cd is same, the speed is ft/s.
[19:44] <jcoxon> okay
[19:48] <Hiena> The possible dropsite could be calculated, if you enlarge the original path on the wind direction by the scale of the ascent and descent time.
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[20:10] <Hiena> Sleepmode on.
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[20:22] <gerard_mp> hi
[20:23] <gerard_mp> jcoxon: are you here?
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[22:29] <hrf_jack> jcoxon: hi, how did it go?
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[00:00] --- Tue Feb 12 2008