highaltitude.log.20091126

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[01:36] <EI5GTB> evening
[01:36] <EI5GTB> when you guys launching next?
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[08:04] <rjharrison> hey jcoxon
[08:04] <rjharrison> You there or have you just been left on :)
[08:05] <jcoxon> no i'm here
[08:05] <rjharrison> I ordered some recovery poles yesterday hopefully will see them im time for xmas
[08:05] <rjharrison> 12m access apparently
[08:05] <jcoxon> yeah i saw the email
[08:06] <rjharrison> I thought I'd test them on your payload in Stoke
[08:06] <jcoxon> quite pricey
[08:06] <rjharrison> Yep but when you're staring up a tree looking at your payload they look alot cheaper
[08:06] <jcoxon> fair enough
[08:07] <jcoxon> i heard rumours that junderwood visted the shrine to ballasthalo2 and he could only see string
[08:07] <rjharrison> Ooh
[08:07] <rjharrison> junderwood any comments on that
[08:07] <rjharrison> Only lawence has ever actually seen the payload
[08:08] <rjharrison> laurence even
[08:08] <junderwood> I found about 10 yds of string, bits of balloon and a plastic pipe fitting on the floor
[08:08] <junderwood> No sign of anything up the tree but there were rather a lot of leaves around!
[08:08] <rjharrison> Humm looks like it has been recovered
[08:08] <rjharrison> ! by us
[08:09] <rjharrison> jcoxon you had contact details on?
[08:09] <rjharrison> ! = Not
[08:09] <junderwood> Also a 1ft length of wood with string atached. Looked like someone had been using it to try to drag it down
[08:09] <rjharrison> We would have to ask laurence how he left the site
[08:10] <jcoxon> rjharrison, yeah i had details
[08:10] <rjharrison> I know he threw some string up
[08:10] <junderwood> Should be very easy to see now if it's still there
[08:10] <jcoxon> it was pretty hard to see up the tree
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[08:10] <rjharrison> Yep junderwood how close are you to the landing zone (LZ)
[08:11] <jcoxon> when laurence took pictures
[08:11] <junderwood> Now? About 200 miles!
[08:11] <rjharrison> Ahh
[08:11] <rjharrison> laurence is still quite close jcoxon?
[08:11] <junderwood> just happened to be heading south from Manchester and decided to have a look
[08:11] <rjharrison> junderwood cool
[08:12] <rjharrison> That is what I really need to do
[08:12] <jcoxon> oh rjharrison i fixed my temp sensors on the same one-wire network
[08:13] <jcoxon> i'm not sure if laurence is nearby i don't think he is at home
[08:17] <rjharrison> jcoxon cool
[08:17] <rjharrison> So you have multiple sensors on the one wire
[08:17] <jcoxon> yeah, one pin on hte avr
[08:17] <rjharrison> Did you write the protocol or are you using the arduino library?
[08:17] <jcoxon> just using hte library
[08:18] <jcoxon> me writing a protocol, pah :-p
[08:18] <rjharrison> cool I may rape and pillage it at some point
[08:18] <rjharrison> Di you have the 32 char keys for the sensors
[08:19] <rjharrison> or do you query them for it
[08:19] <jcoxon> I'm going to query them in advance and then hardcode them in
[08:19] <jcoxon> so that i place the data in the appropriate variable
[08:19] <rjharrison> I think it you can remember the ID's you can query faster
[08:19] <rjharrison> yep
[08:19] <rjharrison> you beat me
[08:19] <jcoxon> just need to sort the code a bit
[08:19] <jcoxon> job for today
[08:19] <rjharrison> the keys are printed on the sensors
[08:20] <rjharrison> good luck to reading them though
[08:20] <rjharrison> my 38 year old eyes are too buggered to read them
[08:20] <jcoxon> nah i'll just query them and write them down
[08:21] <jcoxon> i'm not doing parasitic power but providing 3.3v
[08:21] <rjharrison> Yep cut and paste sounds good to me
[08:21] <rjharrison> yep I do that too
[08:21] <rjharrison> It's just plain cleaner in my brain
[08:22] <jcoxon> haven't really made much progress this week
[08:22] <jcoxon> got loads of real world work
[08:22] <rjharrison> My ears were burning this morning getting some plaudits over the local repeater whilst I was listening in on the way to work :)
[08:22] <rjharrison> jcoxon, me too
[08:22] <rjharrison> In fact I should be doing it now
[08:23] <jcoxon> i've got a date with hte library today
[08:23] <rjharrison> Ooh romantic
[08:23] <jcoxon> once i find a place that sells earphons near london bridge
[08:23] <rjharrison> Revision?
[08:24] <rjharrison> I'm getting Icarus III ready for launch
[08:25] <rjharrison> Still tusseling with having internal / external camera
[08:25] <rjharrison> on a servo!
[08:26] <jcoxon> nah, got to write an audit for a project
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[09:09] <juxta> rjharrison: are you about?
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[10:01] <jonsowman> hi all
[10:20] jcoxon (i=zeusbot@lister.antycip.co.uk) joined #highaltitude.
[10:20] <jcoxon> hey all
[10:22] <juxta> hi jcoxon
[10:24] <jcoxon> hey juxta , hows it going?
[10:24] <juxta> not too bad thanks
[10:24] <juxta> had a chance to test out my yagi's :)
[10:25] <jcoxon> ooo cool, works well?
[10:26] <juxta> I'm still doubting the range in the back of my mind though, hard to believe that LOS would yield so much extra range..
[10:26] <juxta> some details and pics of the range here jcoxon: http://projecthorus.org/?p=209
[10:26] <jcoxon> you've seen it in action though in our last flights
[10:27] <juxta> true true
[10:28] <juxta> what do most people do for antennas? yagis?
[10:28] <jcoxon> with a well directed yagi we've actually never lost contact with a flight
[10:28] <jcoxon> (if everything onboard is working)
[10:28] <juxta> nice - how large a yagi are we talking?
[10:29] <jcoxon> well i only use a moxon which is a rough 2 ele yagi
[10:30] <jcoxon> other yagis used are quite large, not sure how many ele
[10:30] <jcoxon> wow you've made loads of progress with your payload
[10:30] <juxta> school's out ;D
[10:31] <juxta> how much range have you managed with your moxon, jcoxon?
[10:32] <jcoxon> hmmm about 200km probs
[10:32] <juxta> wow
[10:32] <juxta> impressive
[10:32] <jcoxon> i'm in central london on the 2nd floor so have poor views as well
[10:32] <juxta> I probably didn't need to make such a big yagi then
[10:32] <juxta> & I was considering making an even larger one, I wasn't sure what I'd need...
[10:32] <jcoxon> so its matter of careful positioning in odd directions - seems to get signals in weird directions due to reflection off buildings
[10:33] <juxta> that would be tricky I imagine
[10:33] <jcoxon> that yagi looks just right
[10:33] <juxta> the big one? or the small one?
[10:33] <jcoxon> the big one will be fine for all flights i reckon
[10:33] <juxta> alrighty
[10:33] <juxta> it's the biggest that would fit in my boot :)
[10:34] <juxta> the little one made out of coathangers is really good though, considering how simple & easy to put together it was
[10:35] <jcoxon> :-)
[10:36] <juxta> how did you go with adding the payload to the tracker by the way jcoxon? I had a look the other night when i tested it out, but it didn't seem to log
[10:37] <jcoxon> oh yeah i can do it now
[10:37] <jcoxon> one sec
[10:37] <juxta> cheers :)
[10:37] <jcoxon> ssh is the one thing i can do in hte library
[10:37] <juxta> what do you do jcoxon?
[10:37] <jcoxon> can i have an example string
[10:38] <jcoxon> i'm a final year medical student
[10:38] <jcoxon> am at the mo working on an audit
[10:38] <juxta> oh nice :)
[10:38] <juxta> erm, let me get a string for you
[10:38] <jcoxon> the other questions: rtty shift? ascii-8? and baud rate?
[10:39] <juxta> here's a string, but the checksum in this example will be wrong:
[10:39] <juxta> $$HORUS,209,02:21:17,-34.8792,138.4931,7,0,7*FF
[10:39] <juxta> shift is 425, it's ascii-7 & 50 baud
[10:39] <juxta> 1 stop, no parity
[10:40] <jcoxon> what are the last 2 fields?
[10:40] <jcoxon> after altitude
[10:41] <juxta> string is formatted as $$HORUS,ticks,hours,mins,secs,lat,long,alt,speed,numsats*checksum
[10:44] <juxta> jcoxon: i wrote to our civil air safety authority also
[10:44] <jcoxon> right
[10:44] <jcoxon> done it
[10:46] <jcoxon> definitely need to test it
[10:46] <juxta> excellent, thanks a bunch jcoxon :)
[10:46] <juxta> will do
[10:46] <jcoxon> you should be able to select it now in dl-fldigi
[10:47] <juxta> I'm RDP'ing right now, so I can't really do a live test
[10:47] <juxta> but I'll check in dl-fldigi
[10:48] <juxta> yep it's there :)
[10:48] <juxta> is it supposed to setup the RTTY options also?
[10:49] <jcoxon> yeah it should do
[10:49] <juxta> ah - it sets stop bits to 1.5
[10:49] <juxta> (should be 1)
[10:50] <jcoxon> oh it doesn't adjust that sorry
[10:50] <juxta> ah no worries, easily fixed :)
[10:51] <jcoxon> is that string valid?
[10:51] <juxta> jcoxon, as in the checksum?
[10:52] <jcoxon> just put it through the debug checker and it tells me the checksum is invalid
[10:53] <juxta> yeah, I fudged the checksum, the string was a sample one I had saved & I couldnt be bothered calculating a real sum for it :)
[10:53] <jcoxon> okay
[10:53] <juxta> haha: "*** DCC send request from (Alijah)/(72.51.113.177) received. Trying to get ("MOTHER_SPANKS_CHILD_RATHER_HARD.MPEG")/(953.67MB) through port (15278)..."
[10:55] <juxta> is there a page that I can use to run a test string through when I get home?
[10:55] <jcoxon> juxta, http://spacenear.us/tracker/
[10:56] <juxta> excellent, thanks a bunch jcoxon :)
[10:57] <jcoxon> ummm its prob best to test with dl-fldigi
[10:57] <jcoxon> we are still working on the debug individual string page
[10:59] <jcoxon> very cool to see all three paths on the map
[10:59] <juxta> agreed :D
[11:02] <juxta> jcoxon: is listen.php file part of the tracker? or is that something else that's been written?
[11:05] <jcoxon> so the system is split
[11:05] <jcoxon> between the 'server' and the tracker
[11:05] <jcoxon> listen.php is what collects teh data onto the server and does all the checking etc
[11:05] <jcoxon> then it forwards the data onto the 'tracker' which just presents it on the map
[11:06] <jcoxon> the tracker came first then rjharrison did all the listener server bit
[11:06] <juxta> yeah, that's what I thought
[11:06] <juxta> and by listen.php I meant /listen/view.php, I guess you did too ;p
[11:07] <juxta> oh wait
[11:07] <juxta> there's actually listen.php too
[11:07] <jcoxon> hehe
[11:07] <jcoxon> yeah so view.php is just the raw data from the database
[11:08] <jcoxon> listen.php is actually how dl-fldigi communicates to the server
[11:08] <juxta> ah righto
[11:08] <juxta> I see on view.php that I did actually manage to submit some data the other night
[11:08] <jcoxon> it harks back to the old days of python scripts to parse log files and provide data
[11:08] <juxta> I had a read of the old python script :)
[11:08] <juxta> I couldnt find listen.php & view.php, are they on the wiki too/
[11:08] <juxta> ?
[11:10] <jcoxon> cause the server code is constantly in flux rjharrison never got round to packaging it up and uploading it
[11:10] <juxta> ah righto
[11:11] <jcoxon> i'm sure if you asked he'd provide it but there might be a delay :-)
[11:11] <juxta> hehe
[11:12] <juxta> by the way, just had a read of horus.xml - I'm actually on 434.650, if it matters
[11:12] <jcoxon> oh right
[11:12] <jcoxon> it doesn't at present but might do in the future
[11:12] <jcoxon> when we make some autotuning stations
[11:13] <juxta> alright :)
[11:14] <jcoxon> fixed
[11:14] <juxta> by the way - how do you manage the antennas on your receiving stations? if you're using yagi's, do they have to be manually pointed the whole time, or moved by an automatic tripod? It'd be good to have an 'unmanned' station, but I don't have an auto tripod :)
[11:14] <jcoxon> its pretty much all manual though last flight cusf guys used their auto tracking yagi
[11:15] <jcoxon> which grab data from the server and then moved the yagi
[11:15] <juxta> yeah
[11:15] <juxta> I saw that, pretty cool
[11:15] <juxta> a friend of mine built one, his is still floating around my department at uni, i might be able to grab it
[11:15] <jcoxon> juxta: a well placed radio with a whip would work well, don't always need a directional antenna
[11:16] <jcoxon> but the real issue is radio drift
[11:16] <juxta> ahh yes, good point
[11:16] <juxta> how much drift is there?
[11:16] <jcoxon> again something we are working on
[11:16] <jcoxon> also vnc while slow does help as you can tune dl-fldigi
[11:17] <jcoxon> potentially a lot - requiring a couple of retunes on the radio
[11:17] <juxta> not more than a few khz though?
[11:18] <juxta> I'm just wondering if it's going to be out by 1mhz or something :)
[11:18] <jcoxon> yeah a few khz
[11:19] <jcoxon> does mean that you have to pay attention
[11:19] <juxta> ah right
[11:19] <juxta> yeah, i can imagine losing it totally would be a pain
[11:21] Action: russss is going to order the other board for his USRP
[11:22] <juxta> jcoxon: I was going to post up a very simple yagi page on the wiki - is there some sort of index I should add it to if I do?
[11:28] <jcoxon> russss: the lower freq board?
[11:29] <jcoxon> juxta: it should go in the guides section
[11:29] <juxta> alright jcoxon
[11:30] <russss> yep
[11:31] <russss> so I should be able to receive the 434MHz stuff
[11:36] <jcoxon> yay
[11:36] <jcoxon> another potential listener
[11:41] <russss> I should be able to automate retuning due to drift using the USRP
[11:41] <russss> I need an antenna though
[11:41] <juxta> jcoxon: can I forward you an email?
[11:42] <jcoxon> juxta: sure - jacoxon at googlemail dot com
[11:42] <jcoxon> russss: antennas are easy
[11:42] <jcoxon> well basic antennas are easy, they can get complicated very quickly!
[11:45] <juxta> on the topic of which jcoxon, do you know if the impedence of a yagi is likely to matter if it's not being used for tx, and only for rx?
[11:46] <jcoxon> i don't think it would be significant
[11:47] <juxta> great :D
[11:56] <juxta> jcoxon: i forwarded you an email from our aviation safety authority
[11:56] <juxta> any advice re the parachute question?
[12:01] <jcoxon> yeah jsut replying
[12:05] <jcoxon> done
[12:08] <juxta> jcoxon: just to clarify, the $160/hour is because I picked a controlled airspace launch spot. If I launch in uncontrolled air, that doesn't apply.
[12:09] <jcoxon> oh good!
[12:09] <juxta> that was my fault, i forgot there's an airforce base nearby there :)
[12:09] <jcoxon> then that reply is probably a little long and detailed
[12:10] <jcoxon> oh my first launch was 1 mile from a large air base :-p
[12:10] <juxta> haha, wow
[12:10] <jcoxon> just had to call them on the day and say high
[12:10] <jcoxon> they don't work weekends it seems so just left a message
[12:11] <jcoxon> they own us anyway - they use out house as a landmark for flying for the apache gunships so
[12:11] <jcoxon> owe*
[12:22] <jcoxon> oh juxta looking at your range tests - if you added a ground plane to your test payload antenna the range would be quite a bit better
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[12:29] <juxta> jcoxon: I do have a ground plane :)
[12:29] <jcoxon> oh okay, just you said you were using an exposed core of co-ax
[12:30] <jcoxon> oh wait that was your recieving antenna
[12:30] <jcoxon> i'll be quiet now
[12:33] <EI5GTB> morning guys
[12:33] <Randomskk> hi
[12:35] <juxta> no hassles jcoxon
[12:36] <jcoxon> morning EI5GTB and Randomskk
[12:36] <EI5GTB> no craic?
[12:36] Action: jcoxon is pleased that he now has his 1-wire temperature sensor network working
[12:37] Action: EI5GTB needs to write a safety statment and submit it to the IAA
[12:37] <jcoxon> EI5GTB: any progress?
[12:38] <EI5GTB> naw, been a tap busy, but now that the winter is upon us, i have more time to start this kinda stuff again
[12:38] <EI5GTB> have started my electronics engineering course in college
[12:39] <jcoxon> cool
[12:40] <EI5GTB> indeed.. but launching a baloon hasn't been far from my mind this last few months
[12:41] <EI5GTB> ha ve been occasionally creating predictions... ireland is just big enough to launch a baloon :P
[12:43] <jcoxon> yeah its big enough, we make do with east anglia!
[12:46] <EI5GTB> where do you normally lanch from?
[12:46] <EI5GTB> and how far east can you expent to travel after launch
[12:47] <jcoxon> we nearly always launch from cambridge
[12:48] <jcoxon> distance travelled really varies depending on how risky you are being with your forecasting
[12:49] <EI5GTB> hmm, i see
[12:49] <EI5GTB> hmm, cambridge doesnt give you many eastings
[12:52] <jcoxon> got to take into account population density as well
[12:52] <jcoxon> east anglia is mainly jsut fields
[12:54] <jcoxon> and restricted airspace
[12:59] <EI5GTB> h, ok
[12:59] <EI5GTB> yea
[12:59] <EI5GTB> well, not many areas of dense pop in ireland
[13:00] <EI5GTB> but having never launched i could never know where its going to land
[13:04] <jcoxon> the flight predictions are pretty accurate - certainly enough to use for planning
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[14:19] <jcoxon> bbiab
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[14:37] <jonsowman> what are normal dl-fldigi settings guys? baud/shift/bits/parity/stopbits
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[14:38] <jcoxon> depends - in theory dl-fldigi can set it up automatically for you
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[14:38] <jcoxon> as in the payload xmls define the various settings and when you 'load' that xml it'll autoconfigure it
[14:38] <jonsowman> trying to decode the icarus mp3 files that are on the ukhas site
[14:39] <jcoxon> have you selected icarus in dl-fldigi?
[14:39] <jonsowman> yup
[14:39] <jcoxon> oh wait - icarus will have changed
[14:39] <jcoxon> ignore that
[14:39] <jonsowman> that might be why then
[14:39] <jcoxon> 425shift 50 baud ascii-8
[14:40] <jcoxon> you not getting a clean decode?
[14:40] <jonsowman> nope
[14:40] <jonsowman> just random chars
[14:40] <jonsowman> should RV be enabled?
[14:41] <jcoxon> depends who recorded the mp3
[14:41] <jcoxon> try it off and on and see
[14:42] <jonsowman> no parity and 2 stop bits?
[14:44] <jcoxon> 1.5 stop no parity
[14:44] <jonsowman> hmm still nothing
[14:44] <jcoxon> i just grabbed the wav file and decoded it
[14:45] <jcoxon> RV off
[14:45] <jcoxon> SQL off as well
[14:46] <jonsowman> ok will try again
[14:50] <rjharrison> we missed the boat on this one http://socialnews.toshiba.co.uk/?ReleaseID=14262
[14:51] <jcoxon> i heard about that launch out in the states
[14:51] <jcoxon> think it was by teh JP Aerospace guys
[14:52] <jcoxon> ballasthalo 2 got mentioned on hte GPSL mailing list today by WB8ELK - twas a suprise
[14:52] <bt42> woo
[14:52] <bt42> an lcd backlight with local dimming
[14:52] <bt42> a*
[14:53] <bt42> totally took my interest away from the chair suspended via balloon
[14:53] <bt42> <_<
[14:53] <SpeedEvil> bt42: yeah - I suggested that a couple of years ago on the openmoko mailing lists.
[14:53] <SpeedEvil> Or maybe IRC
[14:54] <rjharrison> jcoxon, nice one
[14:54] <jcoxon> there is a discussion on how to get max altitude
[14:54] <SpeedEvil> It's a quite obvious way of making - for example - an indicator sunlight readable
[14:54] <rjharrison> Are you going to prime the media for atlantic halo or should we wait for the results first
[14:54] <jcoxon> whether you just need a 3kg or does the weight of hte balloon start effect max altitude
[14:55] <rjharrison> jcoxon, I hope to answer that soon :)
[14:55] <jcoxon> and so the concept of pinhole helping you get even higher cropped up
[14:55] <rjharrison> oooh
[14:55] <jcoxon> the general consensus is bigger is better
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[14:56] <jcoxon> rjharrison: http://groups.yahoo.com/group/GPSL/message/6231
[14:57] <rjharrison> that's what my wife said
[14:58] <jcoxon> rjharrison: oh dear
[14:58] <jcoxon> hehe
[15:00] <jcoxon> rjharrison: i added juxta's payload to teh server
[15:01] <rjharrison> Cool I'll have a look
[15:02] <rjharrison> Project horendus
[15:05] <rjharrison> juxta, jcoxon very nice. Impressed with the home built yagi. May have a go at that myself on 869mhz
[15:09] <rjharrison> Humm my yagi design has 68 elements for 20db on 869.5 :_)
[15:23] <Laurenceb> SpeedEvil: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5508
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[15:25] <SpeedEvil> Intersting
[15:25] <Laurenceb> used on gnu radio USRP
[15:26] <Laurenceb> they get 800MHz to 2.4G
[15:27] <jcoxon> Laurenceb: russs has one of those
[15:28] <Laurenceb> its interesting but overpriced and overspecced IMO
[15:28] <Laurenceb> useful for really high end stuff maybe
[15:28] Action: Laurenceb is interested in a USB stick that does the same job, - the FPGA
[15:29] <Laurenceb> $700 to 1400 just for the basic board
[15:30] <Laurenceb> then you have to buy the daughterboards ect
[15:30] <russss> yeah mine is eventually going to the hackspace
[15:30] <russss> it's nice because of the range
[15:30] <russss> you can do 50MHz-2.4GHz
[15:32] <Laurenceb> how does the FPGA work?
[15:32] <Laurenceb> I mean, does that just run some firmware
[15:33] <russss> by default it runs a generic digital downconverter
[15:33] <Laurenceb> or are there actual receiving modes where the FPGA comes into play
[15:33] <Laurenceb> I see
[15:33] <Laurenceb> so you can select a narrower band?
[15:33] <russss> you can do more interesting things with it. But on the USRP1 the FPGA isn't that great as I understand it
[15:34] <Laurenceb> the thing is unless your going for hundereds of MHz of bandwidth, a decent PC can handle the data
[15:34] <Laurenceb> 20MHz or so and you can stove it to an FPGA PCI card if you really want
[15:35] <russss> http://gnuradio.org/trac/wiki/UsrpRfxDiagrams
[15:35] <Laurenceb> thats how they were working at SSTL - pci ADC card, pci FPGA card, and a micro on a usb cable running a pll/vco/mixer setup on eval boards
[15:36] <Laurenceb> looks sensible, but you could build something decent with just the front ends in usb sticks
[15:37] <jcoxon> Laurenceb: we are still waiting for you to build it for us!
[15:37] <Laurenceb> heh Im still not convinced
[15:37] <Laurenceb> that its worth it
[15:38] <jcoxon> Laurenceb: so i've got the tank sensor working
[15:38] <Laurenceb> neat
[15:38] <jcoxon> just need to get a better IR LED
[15:38] <jcoxon> and fine tune the resistor across the opamp
[15:39] <Laurenceb> whats up with the IR LED?
[15:40] <jcoxon> it needs to be slightly brighter
[15:40] <jcoxon> basically when the tank is pretty much full there is no distinction between ON/OFF
[15:41] <Laurenceb> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5928
[15:41] <Laurenceb> interesting - theres no die in there?
[15:42] <jcoxon> nope no dye
[15:42] <Laurenceb> how much current through the LED?
[15:42] <jcoxon> not sure exactly - its not in frount of me at the mo
[15:42] <jcoxon> front*
[15:43] <Laurenceb> what resistor are you using with it?
[15:44] <jcoxon> again - its not in front of me :-p am in the library
[15:44] <Laurenceb> ok
[15:44] <jcoxon> do you think i should increase the current?
[15:45] <jcoxon> i think its more the led, its oddly shaped
[15:45] <jcoxon> its no issue to get a new LED - need to get a few other things as well
[15:47] <Laurenceb> ok - I'd try averaging the difference in photodiode output
[15:47] <Laurenceb> that might get you something more sensible
[15:47] <jcoxon> yeah that is true
[15:48] <Laurenceb> what sort of difference were you getting?
[15:48] <jcoxon> if i subtract on/off then full tank = 4 while an empty tank = 42
[15:48] <Laurenceb> you could easily flash at a few hundered Hz
[15:48] <Laurenceb> that should be fine
[15:49] <Laurenceb> still takes less than a second to do a measurement
[15:49] <jcoxon> then i took some readings with known volumes and graphed it worked out the best trend line then made a small lookup table
[15:49] <jcoxon> its pretty much exponential
[15:51] <Laurenceb> yeah thats the theory
[15:52] <Laurenceb> if you take some datapoints then use gnuplot you could fit to an exponential
[15:52] <jcoxon> i'll do some better sampling/averaging and see if thathelps
[15:52] <Laurenceb> better than a lookup table
[15:52] <Laurenceb> possibly - depends what else is going to be in the flight code
[15:53] <jcoxon> remember that i have 2 avrs onboard
[15:53] <Laurenceb> well probably want to use some floating point already, so it wont hurt much
[15:53] <jcoxon> one doing all the sensors and junk while the other is doing comms
[15:53] <Laurenceb> yeah
[15:53] <Laurenceb> easy to stick some floating point on there
[15:53] <jcoxon> true
[15:53] <jcoxon> i'll see how it comes together
[15:53] <Laurenceb> 1K of flash or so max
[15:54] <jcoxon> got a long list of jobs - this is taking a lot longer then i thought to build
[15:54] <Laurenceb> k, bbl
[16:07] <Laurenceb> back
[16:08] <Laurenceb> I think the results you are getting are very encouraging - but yeah try averaging maybe 100 transitions between on and off - at 200Hz or so
[16:08] <AlexBreton> great news everyone
[16:08] <Laurenceb> i.e. 0.5 seconds for a measurement
[16:08] <AlexBreton> sbasuita
[16:08] <sbasuita> AlexBreton, ooh
[16:08] <AlexBreton> we are making a profit on the CF card :P
[16:09] <AlexBreton> bought 17.99
[16:09] <sbasuita> AlexBreton, wow nice
[16:09] <AlexBreton> 16.99*
[16:09] <AlexBreton> current bit is 18
[16:09] <sbasuita> AlexBreton, ages to go though
[16:09] <AlexBreton> exactly
[16:09] <AlexBreton> so the bid may well increase further
[16:09] <sbasuita> : )
[16:09] <AlexBreton> FTSE tumbled today :(
[16:09] <sbasuita> bawww
[16:10] <AlexBreton> despite the fact it broke for several hours
[16:10] Action: Laurenceb sends AlexBreton to #stockmarkettraders
[16:11] <AlexBreton> fake room :P
[16:11] <jcoxon> haha you tried
[16:12] <Randomskk> lol having google finance track my ISA was a terrible idea
[16:12] <Randomskk> now I can check how much money I'm losing without even logging in to fidelity
[16:12] <AlexBreton> heh there is one called #daytraders
[16:12] <Randomskk> I'm just glad google don't give you a graph of money vs time, or at least I haven't found it
[16:16] <AlexBreton> ouch -3.2% on the ftse 100
[16:16] <AlexBreton> that's painful
[16:17] Action: jcoxon is having fun with graphs on openoffice
[16:17] <Randomskk> fldigi is so much fun to just play with different encodings and two laptops
[16:17] <russss> that's because dubai just fell apart
[16:17] <Randomskk> some modes sound great, too
[16:18] <Laurenceb> thats kind of the idea for the usb stick
[16:18] <Laurenceb> fldigi without the need for a scanner or anything
[16:18] <Laurenceb> and much better performance/bandwidth
[16:18] <Randomskk> http://www.youtube.com/watch?v=HwseyYXjOrw is pretty rad, like ten different simultaneous streams
[16:19] <Randomskk> lol this was just using a microphone and the laptop speakers
[16:19] <Laurenceb> heh
[16:19] <Laurenceb> its so crippled
[16:19] <Randomskk> even then, some modes - MFSK was pretty good - could pick up almost zero volume from across the room
[16:19] <Randomskk> also whistling morse is quite fun
[16:19] <Randomskk> or HELL is absolutely great
[16:19] <Laurenceb> neat I heavent tried that
[16:19] <russss> lol
[16:19] <Randomskk> HELL sends pictures basically
[16:19] <Laurenceb> your a satanist?
[16:20] <Randomskk> it scans vertically and horizontal after each row is done
[16:20] <Randomskk> the amplitude or maybe frequency sets the darkness of that pixel
[16:20] <russss> oh yeah, that one's crazy
[16:20] <Randomskk> text is encoded graphically
[16:20] <Randomskk> so on your screen a picture builds up of the text
[16:20] <russss> and it sends 2 rows incase the frequency varies
[16:20] <Randomskk> yea
[16:20] <russss> http://en.wikipedia.org/wiki/Hellschreiber
[16:21] <Randomskk> lol yes that one
[16:21] <Randomskk> fldigi just calls it hell :P
[16:24] <jcoxon> jonsowman: did you ever get the mp3 to decode?
[16:24] <Randomskk> he's at a supervision atm, but he did get some of it
[16:24] <Randomskk> not the whole thing perfectly but 'icarus' came up and at one point numbers and commas
[16:26] <jcoxon> weird - it decoded really well on my laptop when i tested it earlier
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[17:31] <rjharrison> Hi RocketBoy
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[17:33] <RocketBoy> yo
[17:34] <RocketBoy> Hey laurenceb: a rocketry mate of mine is looking for a GPS that will be good for for Rocketry - just for measuring peak altitude and landing spot.
[17:34] <Laurenceb> ublox5
[17:34] <RocketBoy> He says that all the GPSes he has tried loose lock during the boost phase - and then struggle to regain it.
[17:35] <RocketBoy> cool - thats what I guessed youd say
[17:35] <Laurenceb> interesting - probably the doppler shifting
[17:35] <Laurenceb> ublox5 might be worth a try, but it may well not work
[17:35] <RocketBoy> Strange that they loose lock - because I doubt that they break the 999knot or 60,000ft limits
[17:35] <Laurenceb> probably best to try the 4G mode
[17:35] <Laurenceb> yeah, but the doppler shifts rapidly
[17:36] <RocketBoy> but you think the ublox5 would be good to try
[17:36] <RocketBoy> ?
[17:37] <Laurenceb> yeah, if he wants to bother
[17:37] <Laurenceb> I'm not convinced it will work
[17:37] <Laurenceb> but who knows
[17:38] <Laurenceb> best to try it with the 4G mode or whatever the maximum setting is - I forget
[17:38] <RocketBoy> ok - ta - I'll pass that on
[17:39] <rjharrison> RocketBoy you going to put any more pics up
[17:39] <rjharrison> I liked the flickr account BTW
[17:39] <RocketBoy> oh - right - can't remember whats on it now
[17:40] <RocketBoy> a few picks form Bang filming IIR
[17:40] <RocketBoy> pics
[17:42] <Laurenceb> link?
[17:45] <RocketBoy> http://www.flickr.com/photos/16828840@N07/sets/72157621911728585/
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[18:43] <Laurenceb> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5928
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[19:52] <Laurenceb> cya
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[20:23] <AlexBreton> sbasuita, revised physics?
[20:24] <sbasuita> AlexBreton, no
[20:24] <sbasuita> AlexBreton, i revised last week
[20:24] <sbasuita> AlexBreton, ; P
[20:24] <AlexBreton> sbasuita, no way
[20:25] <AlexBreton> argh cba
[20:25] <sbasuita> AlexBreton, i've got greek set text to learn :|
[20:25] <AlexBreton> sbasuita, wahey
[20:33] <jonsowman> evening guys
[20:33] <sbasuita> AlexBreton, so do you....
[20:34] <AlexBreton> sbasuita not yet
[20:35] <sbasuita> evening jonsowman
[20:43] <AlexBreton> sbasuita, loving the German europop on Spotify
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[20:44] <SpeedEvil> np: Nena - 99 luft balons.
[20:44] <AlexBreton> I was listening to that a few minutes ago
[20:44] <AlexBreton> working my way through Nena
[20:45] <AlexBreton> we ought to play that at our launch
[20:45] Action: SpeedEvil ponders the obvious joke.
[20:45] Action: SpeedEvil decides not.
[20:45] <AlexBreton> kinda suitable ;-)
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[20:48] <rjharrison_> evening all
[20:49] <AlexBreton> evening
[20:49] <AlexBreton> we are making a profit on our CF card ;-)
[20:49] <AlexBreton> bought 17 pounds, current bid 18 pounds
[20:50] <DanielRichman> :O
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[21:13] <sbasuita> Torrents = crazy IRC lag = digest of messages every 10 minutes ;P
[21:21] <SpeedEvil> Set your upload cap to no more than 80% of your uplink
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[21:37] <sbasuita> SpeedEvil, it is
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[00:00] --- Fri Nov 27 2009