highaltitude.log.20101003

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[03:10] <Darkside> juxta: there?
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[06:04] <Darkside> juxta: hey
[06:04] <Darkside> juxta|console:
[06:04] <juxta|console> hey Darkside
[06:04] <juxta|console> how you doing? :)
[06:05] <Darkside> tiiiired
[06:05] <Darkside> got back from a lan about 11am
[06:05] <Darkside> then went and did this:
[06:05] <Darkside> http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs002.snc4/33472_1635872853732_1144042127_1761011_2791455_n.jpg
[06:05] <Darkside> http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs685.snc4/62518_1635873213741_1144042127_1761014_5429667_n.jpg
[06:05] <Darkside> http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs345.ash2/62563_1635873013736_1144042127_1761012_2315560_n.jpg
[06:06] <Darkside> 40m half-wave dipole, set up like an inverted V, but horizontal
[06:06] <Darkside> and about 2m, above the ground, for NVIS propogation
[06:06] <juxta|console> woo
[06:06] <juxta|console> in your yard?
[06:06] <Darkside> yep
[06:06] <Darkside> it just fits
[06:07] <juxta|console> sweet
[06:07] <Darkside> i was doing a dodgy and transmitting on 7.190 for a little bit...
[06:07] <juxta|console> now you just need to mow the lawn ;p
[06:07] <Darkside> with all callsigns and shit removed...
[06:07] <Darkside> tried to see if my dad could hear it - no go
[06:07] <Darkside> i'm not surprised, with 40mw
[06:07] <juxta|console> yeah true, thats a bit far
[06:08] <juxta|console> im at work right now
[06:08] <juxta|console> but if you hang around tonight i'll ask people if they can hear it if you turn it on for a few secs later
[06:08] <juxta|console> launch is looking like go for sunday
[06:09] <juxta|console> though sat would be better
[06:09] <juxta|console> sat would be amazing infact
[06:09] <juxta|console> i think Grant wants to do the launch on sun though
[06:10] <Darkside> heh
[06:10] <Darkside> hence the 10/10/10 thing
[06:10] <juxta|console> yeah ;p
[06:10] <juxta|console> i'll see what he says
[06:10] <juxta|console> if we launched on sat we could basically walk to the landing site
[06:11] <Darkside> what?
[06:11] <Darkside> really?
[06:11] <juxta|console> yeah, 2 secs
[06:11] <juxta|console> http://habhub.org/predict/#!/uuid=a0973c998bbca2f86bfea6ca670a4400b729a387
[06:11] <juxta|console> i mean it's a fair way out so the predictions will shift
[06:11] <juxta|console> but assuming it holds true that would be awesome :)
[06:12] <Darkside> hahaha
[06:12] <Darkside> thats cool
[06:12] <juxta|console> wind inversions, woo
[06:13] <Darkside> sunday is interesting
[06:13] <juxta|console> yeah we'll have to be careful there
[06:14] <Darkside> big fields
[06:14] <juxta|console> i will put together some emails - your payload wil be doing 300b rtty, right?
[06:14] <Darkside> yep
[06:15] <juxta|console> ok cool
[06:15] <Darkside> as to the frequency....
[06:15] <juxta|console> what do you put the weight as?
[06:15] <Darkside> hrmmm
[06:15] <juxta|console> light hopefully!
[06:15] <Darkside> i havent got my batteries or regulators yet, so i'm not sure..
[06:15] <Darkside> yes light
[06:15] <juxta|console> okay
[06:15] <juxta|console> I will be building my payload on tuesday I reckon
[06:16] <Darkside> ok
[06:16] <Darkside> hmm
[06:16] <Darkside> still not sure about mine
[06:16] <Darkside> i.e. how i'm going to pack it all..
[06:16] <juxta|console> you can always get a big block of foam and hack chunks out for the various modules to sit in
[06:17] <juxta|console> then put it all in a polystyrene box
[06:17] <juxta|console> we'll be flying the comms repeater again too I think
[06:17] <Darkside> heh
[06:17] <juxta|console> not for the general public to use though
[06:17] <Darkside> its goign to be a long line...
[06:18] <juxta|console> comms will probably go right inside with telemetry this time
[06:18] <Darkside> i'll have 10m of antenna on either side of my payload
[06:18] <juxta|console> okay
[06:18] <Darkside> i.e. the 40m half-wave dipole
[06:18] <juxta|console> what sort of wire are you planning on using?
[06:19] <Darkside> i'm currently using some black multi-core stuff - it wouldn't be able to support the weight of the payload
[06:19] <Darkside> would have to run the cord along with it, and maybe cable-tie the antenna on at a few points
[06:19] <juxta|console> yeah - use the cord to support the weight
[06:19] <Darkside> might be an idea to do a test run and see how it goes together
[06:19] <juxta|console> I'd usggest something like wire-wrap wire for the antenna itself
[06:20] <juxta|console> really really thin
[06:20] <juxta|console> (and light)
[06:20] <Darkside> the black stuff i have is very light too
[06:20] <Darkside> i'll see about teh wire-wrap wire tho
[06:21] <juxta|console> wire-wrap is about 32 AWG i think
[06:21] <juxta|console> so very thin
[06:22] <Darkside> i'd be worried about it breaking
[06:24] <juxta|console> yeah thats the only downside of it
[06:25] <juxta|console> but 20m of wire adds to weight
[06:25] <Darkside> i'll have to try and mesure everything of mine
[06:25] <Darkside> yeah
[06:25] <Darkside> i dont have a scale that sensitive here
[06:25] <juxta|console> not to worry - we can sort it out
[06:25] <Darkside> i just want it all sorted out asap, so i don't have to worry
[06:25] <juxta|console> actually i have an idea
[06:26] <juxta|console> there's a line available for making electric fences - it's a nylon braid with thin wire strands woven in. it'd easily be strong enough to take the load, and would act as an antenna too
[06:27] <Darkside> hey that could be cool
[06:27] <Darkside> will need to have some kind of load bearing mounts on the payload, for it to hook onto
[06:27] <juxta|console> yeah just a couple of loops or something
[06:27] <Darkside> insulating mounts too :P
[06:27] <Darkside> actually i have something that might work for that
[06:27] <juxta|console> we could built it into the payload quite easily, so that the line is a part of it
[06:27] <juxta|console> build*
[06:27] <juxta|console> save setup time
[06:27] <Darkside> ok
[06:28] <Darkside> when?
[06:28] <juxta|console> http://www.grandeverge.com/myfiles/image/Ovinet.jpg
[06:28] <Darkside> and where can you get the wire from
[06:28] <juxta|console> i'm not sure - I'll ask a few farmers
[06:28] <juxta|console> failing that i know a few places where it could be had for free if you dont mind a tingle or two ;p
[06:29] <Darkside> hahahahhhahaa
[06:29] <Darkside> just use insulated wirecutters :P
[06:34] <Darkside> i hope all my stuff gets here this coming week..
[06:35] <Darkside> the 5v regulator on my board gets really hot..
[06:35] <juxta|console> pop a little heatsink on it
[06:35] <Darkside> there is one on it already :P
[06:35] <juxta|console> hahafailing that i have a couple
[06:35] <Darkside> the heatsink gets hot eough to burn me
[06:35] <juxta|console> of switchmode regs
[06:36] <Darkside> yeah, i have some coming in the mail - hopefully they'll be here in time!
[06:36] <juxta|console> there's another electric fence material
[06:36] <Darkside> my seminar is on friday, so I need the prototype working for that, be it in a foam box or not
[06:37] <Darkside> it sucks, sooo much stuff to do this coming week
[06:37] <juxta|console> it's like a nylon ribbon with the metal woven in too
[06:37] <juxta|console> that night be better, it wouldnt unwind like the cord might
[06:37] <Darkside> and i'll be doing my license exam either saturday or sunday, depending when we launch
[06:37] <juxta|console> hehe
[06:37] <Darkside> i'm a bit worried about having the woven metal
[06:37] <Darkside> i dunno if having it not connected throughout the cord woudl cause problems
[06:38] <juxta|console> hmm
[06:38] <juxta|console> it should be pretty much continuous
[06:39] <juxta|console> electric fences wouldn't perform too well if they were full of gaps in the conductor
[06:39] <Darkside> nah, i mean how the different weaves might be insulated from each other
[06:39] <juxta|console> oh right
[06:39] <Darkside> i guess it shouldnt matter
[06:39] <juxta|console> esp not at HF
[06:39] <Darkside> again - it would be good to get the payload constructed, get up on a hill, and transmit
[06:39] <juxta|console> http://s7d5.scene7.com/is/image/PetsUnited/BXF08
[06:41] <Darkside> anyway, ima snooze for a bit - i'll be awake again a bit later for food, and I can go outside and wire up my transmitter again
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[06:48] <juxta|console> haha, rightio :)
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[06:52] <defyt> hey guys, what are you guys using for video sending/receiving these days?
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[08:06] <jcoxon> Morning all
[08:07] <jcoxon> Does anyone know if the old cusf predictor is still online?
[08:07] <juxta|console> jcoxon: I think it is somewhere, Steve was looking for it a while ago
[08:07] <jcoxon> Struggling to find it on my phone
[08:08] Action: jcoxon is in Iceland
[08:09] <jcoxon> Hows everything juxta?
[08:10] <juxta|console> ow wow jcoxon
[08:10] <juxta|console> what are you doing up there?
[08:10] <juxta|console> things are good here, will be leaunching this weekend
[08:10] <jcoxon> Just escaping for the weekend
[08:10] <jcoxon> As in next weekend?
[08:11] <juxta|console> oh, yes
[08:11] <juxta|console> that one
[08:11] <jcoxon> Nice, I'm on call :(
[08:11] <juxta|console> oh damn
[08:11] <juxta|console> looks like we'll be flying Darkside's HF telemetry payload too
[08:12] <jcoxon> Amazing
[08:12] <juxta|console> should be a good launch - are you on your phone right now?
[08:12] <jcoxon> That can be recieved on dlfldigi
[08:13] <jcoxon> Yeah over wifi
[08:13] <juxta|console> oh righto - was going to send you a link to a prediction, perhaps not in that case :)
[08:13] <jcoxon> Oh I'll have a go
[08:13] <juxta|console> http://habhub.org/predict/#!/uuid=a0973c998bbca2f86bfea6ca670a4400b729a387
[08:14] <juxta|console> i helped a friend build up a telemetry system for a fairly high powered rocket which flew the other day
[08:14] <juxta|console> recovered, hurrah
[08:15] <juxta|console> (essentially using the UKHAS telemetry format)
[08:16] <jcoxon> Hehe doesn't really work on the phone but I can see the flight path
[08:16] <jcoxon> Not far to travel
[08:17] <jcoxon> So I've had an idea while here in Iceland
[08:17] <jcoxon> Floaters work best at night
[08:17] <juxta|console> ooh, i think i know where this is going
[08:17] <jcoxon> So launch a floater from Iceland, to the uk
[08:19] <jcoxon> Use 434 and Spot to track
[08:19] <juxta|console> how far is it?
[08:19] <jcoxon> No idea
[08:19] <juxta|console> heh
[08:19] <jcoxon> On my phone :)
[08:20] <jcoxon> Could you measure on Google earth?
[08:20] <jcoxon> Its quite far
[08:20] <jcoxon> Funnily i can see where they launched that balloon recently
[08:20] <juxta|console> 1800km
[08:21] <jcoxon> Ouch
[08:21] <juxta|console> well, to london
[08:21] <jcoxon> That's abit far
[08:21] <jcoxon> To land?
[08:22] <juxta|console> from the closest coasts around 870km
[08:22] <juxta|console> right up north of the UK that is
[08:24] <jcoxon> That could be possible
[08:25] <jcoxon> Something to think about
[08:26] <Upu> £300 plane ticket to Icelan
[08:26] <Upu> In fact I'm there in march so if you want it launching let me know
[08:27] <jcoxon> It would be fun
[08:27] <jcoxon> Need careful pricing
[08:27] <jcoxon> Predictions*
[08:28] <jcoxon> Will get in contact with the
[08:28] <jcoxon> Icelandic team
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[08:35] <Upu> I love the fact there is an Icelandic team :)
[09:22] <fsphil> that'd be worth trying, with a really simple payload to minimise losses
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[09:43] <jcoxon> I'm thinking you'd need something like a spot to bridge the gap between radio rx
[09:43] <juxta|console> a boat ;D
[09:43] <jcoxon> I've ordered my new flight computers so am happy to contribute one
[09:43] <russss> well, that or HF I guess
[09:44] <jcoxon> Considering they are slightly designed with floaters in mind
[09:44] <russss> unless you could get a listening station on the Faroe islands, then you could probably get consistent UHF coverage.
[09:45] <jcoxon> Yeah that is true
[09:46] <DanielRichman> iceland->uk floater? wouldn't that cause legal troubles?
[09:46] <russss> even without that actually - the midpoint is only ~400km from each coast.
[09:46] <DanielRichman> I thought you were dissuaded from launching a floater that would land in the UK
[09:47] <jcoxon> Nope
[09:47] <jcoxon> Its just that they usually leave the uk
[09:48] <jcoxon> Legally it depends on the launch site
[09:48] <DanielRichman> You wouldn't be able to claim the trans-a title
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[09:48] <DanielRichman> but it would be good practice
[09:49] <russss> seems like it would be a bit fiddly to aim
[09:49] <jcoxon> As Churchill has 24hr permission while ears is delight
[09:49] <jcoxon> Oh I know about that but is potentially an impressive flight with low tech
[09:50] <jcoxon> Daylight*
[09:50] <DanielRichman> [ 1814.309262] usb 6-3: configuration #1 chosen from 1 choice
[09:51] <DanielRichman> IT'S ALIVE
[09:51] <jcoxon> Would be sensible to chat with atc in Scotland if that's where its heading
[09:51] <russss> yeah, you're on top of quite a lot of transatlantic flight paths there
[09:54] <fsphil> be a good excuse for me to travel to the north of scotland, see the sites, track the balloon .. the usual :)
[09:55] <jcoxon> I reckon a simple flight computer with a second hand spot module would work well
[09:55] <russss> heh
[09:55] <jcoxon> 1.5kg latex balloon with pinhole
[09:55] <jcoxon> Take advantage of the long nights
[09:56] <jcoxon> Aiming would be a challenge
[09:57] <jcoxon> Would probably need it to be launched by the Icelandic guys as would struggle to predict a day and get there ourselves
[09:58] <russss> http://www.turbulenceforecast.com/atlantic_westbound_tracks.php
[09:58] <russss> that was the map I was looking for
[10:02] <jcoxon> Would have to fly a bit higher
[10:02] <jcoxon> Say 2 OKm
[10:03] <jcoxon> 20km*
[10:03] <jcoxon> That would keep us out of the way
[10:04] <jcoxon> Would people be keen to be involved?
[10:05] <jcoxon> Perhaps a ukhas project?
[10:06] Action: jcoxon is keen to encourage collaborative projects
[10:22] <jcoxon> Hehe obviously not :)
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[10:25] <Upu> I'd be up for it
[10:28] <jcoxon> Great
[10:35] <fsphil> yea me too, though not sure what I can be doing
[10:40] <jcoxon> Hehe okay well I better be off
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[10:42] <Darkside> rightio
[10:42] <Darkside> juxta|console: i'm awake again..
[10:44] <juxta|console> alrighty
[10:48] <Darkside> had about 4 hours sleep :P
[10:48] <Darkside> now i can get food, then sleep some more :P
[10:52] <Darkside> juxta|console: i can turn on my transmitter if there's anyone you can listen
[10:56] <juxta|console> yeah Darkside I just spoke to Adrian, he'll do it for you
[10:56] <juxta|console> what will you be transmitting & on what frequency/
[10:57] <DanielRichman> the atusb is programming :) now to try the xmega...
[10:57] <Darkside> juxta|console: well i shouldn't be transmitting on any frequency :P
[10:57] <Darkside> i might reprogram it to transmit just above the amateur band
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[11:27] <Laurenceb> hi
[11:27] Action: Laurenceb is breadboards cc1020 SDR
[11:27] <Laurenceb> so.many.registers ...
[11:28] <Laurenceb> *breadboarding
[11:36] <SpeedEvil> :)
[11:37] <Darkside> haha Laurenceb
[11:37] <Darkside> i've seen those chips...
[11:38] <Darkside> they look very cool
[11:38] <Laurenceb> ive got it talking
[11:38] <Laurenceb> just need to workout how to configure the registers- writing a script atm
[11:39] <SpeedEvil> It's gotr hundreds hasn't it?
[11:40] <Laurenceb> about 32 need configuring
[11:41] <Laurenceb> im up to about 28 atm
[11:41] <SpeedEvil> I suppose you're using it in a wierd mode too.
[11:42] <DanielRichman> Darkside: the xmega works!
[11:42] <DanielRichman> the board is alive
[11:43] <Darkside> cool!
[11:43] <Darkside> i just got confirmation that my HF transmitter can be heard a few km away
[11:43] <DanielRichman> nice
[11:44] <DanielRichman> Darkside: are you going to use an external pdi programmer w. your xmega?
[11:44] <Darkside> yes
[11:45] <Darkside> since ideally i won't be programming it all that often
[11:57] <DanielRichman> http://picasaweb.google.com/danieljonathanrichman/201009#5523787717639260338 http://picasaweb.google.com/danieljonathanrichman/201009#5523787724814229026
[12:01] <Darkside> cool :)
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[12:32] <m1x10> DanielRichman, cool
[12:33] <m1x10> Im designing somethig like that
[12:33] <m1x10> :)
[12:34] <earthshine> DanielRichman: Do you do all that sMD soldering yourself or get the fab hosue to do it ?
[12:34] <DanielRichman> I did that
[12:34] <m1x10> seedstudio?
[12:35] <earthshine> impressed
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[12:36] <DanielRichman> yeah seeed.
[12:36] <Darkside> heh
[12:36] <Darkside> i'm just gonna get my prototype fabbed at uni
[12:36] <m1x10> can u ask them to make the soldering and increase the price?
[12:36] <Darkside> wont have a solder mask tho
[12:36] <DanielRichman> don't know.
[12:36] <DanielRichman> just solder it yourself
[12:37] <DanielRichman> ;P
[12:37] <Darkside> l2smdsolder
[12:37] <Darkside> :P
[12:37] <DanielRichman> (disclaimer: I had to fix 2 faulty joints before the usb would work) >.>
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[12:46] <juxta|console> i dont think seeedstudio will do assembly m1x10
[12:47] <juxta|console> also nice board DanielRichman :D
[12:51] <DanielRichman> :) thanks. I need to find an excuse to use one of these http://www.atmel.com/dyn/products/product_card.asp?part_id=4558
[12:54] <Darkside> 32 bytes ram :/
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[12:57] <Hiena> That is, what i calls flexible wing: http://www.youtube.com/watch?v=6pIkwXqLrr4
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[13:29] <SpeedEvil> That's not flexible wing.
[13:29] <SpeedEvil> http://www.youtube.com/watch?v=IuKHEdE-ZT8
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[14:09] <Laurenceb> oh yeah
[14:09] Action: Laurenceb has raw adc data churning out of the cc1020
[14:09] <Laurenceb> got it tuned to 434.075mhz
[14:10] <Darkside> oh cool
[14:10] <Laurenceb> unfortunately the bus pirate is hideously slow
[14:10] <Laurenceb> need to find a way to speed this up before i start playing in matlab
[14:10] <Darkside> what sample rate?
[14:10] <Laurenceb> but it looks like data
[14:11] <Laurenceb> dunno - just chucking it onto terminal atm
[14:11] <Laurenceb> need to see how fast i can go - the adc on the frontend is 1.2288msps
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[14:12] <Laurenceb> the agc seems to have been setup correctly at least - the sample spread looks sensible
[14:12] <Darkside> would be cool to try some cdma stuff with one of those
[14:12] <Darkside> its probably possible
[14:12] <Laurenceb> atm ive setup the internal dsp filtering to 9.6khz bandwidth
[14:13] <Laurenceb> its converting the 3 bit i and q samples at 1.288msps to 8 bit
[14:13] <Laurenceb> the datasheet doesnt say if the sample rate is reduced during the bandpass filtering
[14:13] <Laurenceb> im getting out 8 bit data with a sensible spread of values so thats encouraging
[14:14] <Laurenceb> using one of thwe test registers just before the modem
[14:14] <W0OTM> howdy
[14:14] <Laurenceb> going to try going for faster clock speed on the spi and uart
[14:14] <MrCraig> howdy
[14:14] <Laurenceb> hi
[14:15] <W0OTM> iHAB-2 got to 87,000ft
[14:15] <Laurenceb> oddly serial.flushInput() doesnt work correctly in pyserial :-/
[14:16] <W0OTM> 4 hour flight and was 250km downrange
[14:16] <W0OTM> during descent payload was traveling 107m/hr
[14:16] <MrCraig> cool - iHAB-2 was the first one I got to watch tracked out :)
[14:31] <W0OTM> thats great
[14:33] <W0OTM> I am buried in photos and video
[14:33] <W0OTM> wanting to get things posted to the website
[14:43] <Laurenceb> anyone here used octave?
[14:52] <Laurenceb> nvm
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[15:08] <fsphil> W0OTM, congrats! had a listen for the beacon but didn't get much
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[15:33] <fsphil> prediction for a sunday launch, couldn't be more different from the last one: http://habhub.org/predict/#!/uuid=f408d2706ca01a0f21a128a20f9a841dff859686
[15:35] <Upu> try it on Friday :)
[15:35] <Upu> then I'll listen
[15:36] <Upu> but either way hope you get to launch
[15:36] <Upu> afk
[15:37] <MrCraig> well I hope that's more realistic than the previous one - else you'd need a boat
[15:38] <fsphil> funny the saturday prediction has changed quite a bit now, landing just on the north west coast
[15:39] <fsphil> Friday still needs the boat :)
[15:39] <fsphil> the original launch dates had a great pattern .. it went right over the irish sea, then straight back and landed only 5km from where it launched
[15:40] <MrCraig> wow, that'd be really sweet
[15:40] <fsphil> would certainly make recovery a lot simpler :)
[15:41] <MrCraig> yeah, and assuming you've got camera's on the ascent - there'd be a nice range of images there too
[15:43] <fsphil> haha: http://habhub.org/predict/#!/uuid=ca6bec8756ed7a971dedef3b1fcabdaaf5085335
[15:43] <MrCraig> awesome :)
[15:44] <fsphil> I've a second balloon .. build a light payload, no expensive bits
[15:45] <MrCraig> what are the variables that you put into the predictor?
[15:46] <fsphil> they should be there in the bottom right box - 2.5m/s ascent for the long range, 33000m burst alt
[15:47] <MrCraig> you have to guestimate the burst alt?
[15:48] <fsphil> guess, but there is the burst calculator for more accurate numbers: http://www.srcf.ucam.org/~cuspaceflight/calc/
[15:49] <MrCraig> cool - that's really useful
[15:50] <fsphil> very
[15:50] <fsphil> I'm not sure what weight my payload will be yet so 33000 is just a guess
[15:51] <fsphil> it'll likely burst sooner
[15:51] <MrCraig> it's a particularly heavy payload?
[15:51] <MrCraig> I mean - you have lots of extras I'd guess
[15:53] <fsphil> aiming for about 600/700 grams
[15:53] <fsphil> hopefully less
[15:53] <fsphil> heaviest bit is the batteries, 6x aa in all
[15:53] <MrCraig> :-)
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[16:17] <W0OTM> I am going to launch a TrashBag HAB today
[16:18] <W0OTM> The only thing aboard will be a cell phone for tracking. This will be a disposable launch
[16:24] <Hiena> what will you use for a fill?
[16:30] <gb73d> w0otm when is the next launch ?
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[17:03] <Lunar_Lander> hallo
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[17:43] Action: m1x10 says Lunar_Lander hi
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[17:47] <Lunar_Lander> hallo
[17:48] <fsphil> evening all
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[18:03] <russss> http://englishrussia.com/index.php/2010/09/30/secret-department-of-the-moscow-aviation-institute/
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[18:22] <Laurenceb> how can i convert from signed char to integer in python?
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[18:24] <DanielRichman> how are you acquiring the signed char?
[18:24] <DanielRichman> http://docs.python.org/library/struct.html struct.unpack may be what you need but I'm not sure
[18:24] <Laurenceb> r=ord(register_talk(0x49,0x00,ser,0x00))
[18:25] <Laurenceb> register_talk returns a character
[18:25] <Laurenceb> or string of lenght 1 in python lingo i think
[18:25] <Laurenceb> its actually returning a signed char, i want to convert that to an integer
[18:26] <DanielRichman> doesn't ord do what you want?
[18:27] <DanielRichman> >>> ord("a")
[18:27] <DanielRichman> 97
[18:27] <DanielRichman> >>> import struct
[18:27] <DanielRichman> >>> struct.unpack("B", "a")
[18:27] <DanielRichman> (97,)
[18:27] <Laurenceb> no it returns a number between 0 and 255
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[18:27] <Laurenceb> not negative
[18:27] <DanielRichman> ahh, signed char. Yeah struct.unpack("b") will do it
[18:28] <DanielRichman> >>> blob = chr(200)
[18:28] <DanielRichman> >>> blob
[18:28] <DanielRichman> '\xc8'
[18:28] <DanielRichman> >>> ord(blob)
[18:28] <DanielRichman> 200
[18:28] <DanielRichman> >>> struct.unpack("b", blob)
[18:28] <DanielRichman> (-56,)
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[18:31] <Laurenceb> ah thanks
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[18:43] <Laurenceb> http://i.imgur.com/8WnSW.png
[18:43] <Laurenceb> seems to be missing codes in the rontend
[18:43] <Laurenceb> *frontend
[18:43] <Laurenceb> other than that it looks like white noise and nice AGC control
[18:44] <DanielRichman> :o
[18:44] <Laurenceb> i suspect the Rx/Tx switch isnt working correctly as i didnt bother configuring it
[18:44] <Laurenceb> no obvious lines in the waterfall display
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[18:45] <Laurenceb> that probability distribution seems to be centered around slightly less than 0 - thats caused by LO leakage into the front of the mixer
[18:46] <Laurenceb> its a common issue with direct conversion receivers - but looks like Ti have solved it _very_ well
[18:47] Action: Laurenceb is very impresses
[18:47] <Laurenceb> *impressed
[18:47] <natrium42> i am disappoint
[18:47] <natrium42> in grammer
[18:47] <natrium42> of you
[18:47] <Laurenceb> lol
[18:49] <The-Compiler> Hey natrium42 :) remember me? :p
[18:50] Action: MrCraig desperately resists the obligatory yoda impersonation
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[19:02] <fsphil> resist well you did
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[22:18] <Laurenceb> http://i.imgur.com/GRWeM.png
[22:18] <Laurenceb> looks nicer no missing codes now
[22:22] <SpeedEvil> Aha, thanks.
[22:22] <SpeedEvil> I was doing online shopping, and I realise now I forgot the cod.
[22:22] <SpeedEvil> :)
[22:23] <SpeedEvil> That's the cc*?
[22:23] <Laurenceb> yes
[22:23] <Laurenceb> cc1020
[22:24] <Laurenceb> i need a way to get data out faster tho
[22:24] <Laurenceb> for more bandwidth
[22:24] <Laurenceb> bus pirate is limited to 115200bps
[22:24] <SpeedEvil> It's an 8 bit ADC?
[22:24] <Laurenceb> no
[22:24] <Laurenceb> two 3 bit adcs
[22:24] <Laurenceb> for I and Q from the mixer
[22:24] <Laurenceb> then onboard DSP filtering
[22:25] <SpeedEvil> what does 115200 give you? a couple of KHz?
[22:25] <Laurenceb> theres a 8 bit test register between the dsp and the modem
[22:25] <Laurenceb> yes :(
[22:25] <Laurenceb> and the onboard dsp filter only goes down to 9.6 khz bandwidth
[22:25] <Laurenceb> a bit of a problem
[22:26] <Laurenceb> i might have to hack something with a ftdi chip on
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[22:26] <Laurenceb> as i dont have any breakout boards to hand
[22:26] <Laurenceb> really need 1mbps serial for this
[22:27] <Laurenceb> oh well time to catch some sleep
[22:27] <Laurenceb> cya
[22:27] <SpeedEvil> :)
[22:27] <SpeedEvil> Good progress at least.
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[22:35] <jcoxon> evening all
[22:35] <jcoxon> anyone know the link to the old predictor?
[22:36] <SpeedEvil> hmm.
[22:36] <jcoxon> can't find it
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[22:36] <jcoxon> but i think its still running
[22:36] <SpeedEvil> I don't seem to have bookmarked it.
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[22:49] <jcoxon> grrr wish i could find the lin
[22:49] <jcoxon> k
[22:50] <fsphil> it might have been moved after the new one went live
[22:50] <jcoxon> yeah
[22:50] <jcoxon> the old link goes to habhub
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[22:50] <natrium42> link he came to town
[22:51] Action: jcoxon wants the float option
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[22:52] <natrium42> jcoxon: :D
[22:53] <jcoxon> hey natrium42
[22:53] <natrium42> hi
[22:53] <jcoxon> do you have a link to the old cusf predictor?
[22:53] <natrium42> i'm afraid not :D
[22:53] <natrium42> :S
[22:53] <natrium42> *
[22:54] <natrium42> looks like it's set to redirect
[22:54] <natrium42> http://www.srcf.ucam.org/cuspaceflight/predict
[22:54] <jcoxon> yeah
[22:55] <natrium42> got it from http://www.eoss.org/balsoft.htm
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[23:28] <Randomskk> aww. the old predictor is still online but at old_predict iirc
[23:28] <Randomskk> but jcoxon already left
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[00:00] --- Mon Oct 4 2010