highaltitude.log.20120106

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[07:30] <jcoxon> morning
[07:30] <jcoxon> tests show PicoAtlas6 MK2 can last 7hrs on a single AAA
[07:44] <AndChat|> good stuff James :)
[07:44] <AndChat|> oh dcs
[07:44] <AndChat|> ffs*
[07:44] Nick change: AndChat| -> NigeyMoby
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[10:22] <russss> jgrahamc: that GAGA-2 payload is a work of art. Hopefully nobody mistakes it for some kind of alien spaceship...
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[10:24] <daveake_> linky?
[10:25] <russss> http://blog.jgc.org/2012/01/gaga-2.html
[10:26] <daveake_> Nice. Not a million miles from Buzz2. Neater though, and love that colour :)
[10:27] <fsphil> Balls!
[10:27] <daveake_> Yes, 2 instead of my 1 ...
[10:27] <jgrahamc> The colour is vital. When GAGA-1 landed the batteries popped out and we had no signal at all. eroomde spotted it through a line of trees because it was bright yellow. And since I had paint left over I thought it was best to do it again.
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[10:27] <fsphil> the paint is a great idea
[10:28] <fsphil> it seems to be as bright as the florescent yellow tape I have
[10:28] <fsphil> though it's difficult to tell from a photo
[10:28] <daveake_> Agreed. On my larger payloads I use hi-viz tape and that was a life-saver on one mission
[10:28] <daveake_> Is it water-based paint?
[10:29] <jgrahamc> It's acrylic paint because it will stick to polystyrene without eating it. Just sand the polystyrene down a bit first.
[10:30] <daveake_> Ta. I'll get some.
[10:30] <jgrahamc> Details from GAGA-1:http://blog.jgc.org/2010/09/gaga-1-capsule-paint-job.html
[10:30] <daveake_> Excellent, thanks.
[10:33] <fsphil> how much of that bottle did it need?
[10:36] <Nickb1> hello
[10:36] <Nickb1> where can i find the form for submitting a payload?
[10:36] <jgrahamc> I think I used about half the bottle on GAGA-1. I put on two coats to get a really good finish and GAGA-1 was quite bit larger.
[10:38] <daveake_> Nickb1 - http://ukhas.org.uk/_media/general:met_balloon_release_application_jan_05_.doc
[10:39] <daveake_> I keep a filled-in copy on my PC, and just change the launch date/dates for each application
[10:40] <Nickb1> thanks daveake
[10:40] <Nickb1> But i mean the form for submitting it to the server :)
[10:41] <daveake_> Ah, LOL
[10:43] <daveake_> So you mean http://habhub.org/genpayload/ ?
[10:43] <fsphil> jgrahamc, is that the 250ml bottle?
[10:43] <daveake_> That generates the payload file. AFAIK you have to ask a habhub person to upload for you
[10:44] <fsphil> hehe, they have florescent pink paint too
[10:44] <Nickb1> yes thats it
[10:44] <daveake_> Uputone
[10:44] <Nickb1> thanks!
[10:45] <Nickb1> I would like to submit the payload for doing a test next week
[10:45] <fsphil> lol
[10:45] <fsphil> I might get a small tub, put some pink on the next one
[10:46] <fsphil> land it in yorkshire
[10:46] <daveake_> I've used pink wire and straws so far, as a nod to the pink machine :)
[10:47] <fsphil> I wonder if a spherical payload will be more unstable, and move around more than a cube
[10:48] <daveake_> Probably. Buzz2 certainly got in a tangle.
[10:48] <daveake_> He also hit approx 260mph on the way down!
[10:48] <fsphil> sweet!
[10:48] <fsphil> though to be fair, it was up realllly high
[10:48] <daveake_> Yep
[10:49] <fsphil> they've a fair selection of florescent colours. might do a technicolour one
[10:50] <jgrahamc> fsphil: just been down into the basement to check. Yes, it's 250ml.
[10:50] <fsphil> thanks!
[10:52] <daveake_> I was looking at the Buzz2 log. I had a pressure sensor on there, and according to that the lowest pressure was shorly before peak altitude. Looking back a bit, there seems to be a fair bit of noise on that.
[10:53] <daveake_> It wasn't specced to those low pressures anyway
[10:53] <Nickb1> BMP085?
[10:53] <daveake_> SCP1000
[10:54] <daveake_> Maybe next time I'll put the SD card back in and log to that, then do some filtering when I get the data back
[10:54] <eroomde> morning all
[10:54] <daveake_> Morning
[10:54] <eroomde> daveake_: met Dave Robertson on hurs
[10:55] <eroomde> very ncie guy
[10:55] <eroomde> has a good solid tracker which he's tested driving around
[10:55] <daveake_> Oh, cool.
[10:55] <eroomde> though not across the meridian yet
[10:55] <daveake_> :)
[10:55] <eroomde> but he seems to be a BSD admin and developer so he knows what he's doing software-wise anyway
[10:55] <eroomde> gonna help him with a range test when he gets there
[10:56] <fsphil> thanks jgrahamc
[10:56] <daveake_> nice
[10:56] <jgrahamc> Morning eroomde
[10:57] <eroomde> morning jgrahamc
[10:57] <eroomde> how are things?
[10:58] <jgrahamc> Very well. Working on various things include GAGA-2
[10:58] <jgrahamc> Hoping to do a launch in the spring time when the weather is calmer.
[10:58] <jgrahamc> How's the job?
[10:59] <eroomde> well
[10:59] <eroomde> yesterday was my last day
[10:59] <eroomde> so now I am w/o job
[10:59] <jgrahamc> Ah.
[11:00] <jgrahamc> Are you actively looking for something?
[11:02] <cuddykid> have people seen this? http://modmyi.com/content/6513-ipad-survives-100-000-foot-fall-space.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+home_all+%28MMi+%7C+Homepage+All%29
[11:04] <daveake_> LOL at this comment - "why is that the ipad is in perfect condition upon landing, falling from space at that speed, that ipad would have been burnt to pieces?"
[11:04] <cuddykid> haha brilliant
[11:04] <Darkside> derp
[11:04] <russss> NOT SPACE
[11:04] Action: russss stabs self in face
[11:05] <eroomde> yes
[11:05] <eroomde> this is the most common misunderstanding i come across
[11:05] <eroomde> 'why doesn;t it burn up'
[11:05] <eroomde> like there's some portion of that atmosphere that's always on fire that you have to transition through
[11:06] <fsphil> hollywood's fault
[11:06] <Nickb1> think the tracker broke its fall
[11:06] <fsphil> also people who launch balloons saying they get to space
[11:06] <fsphil> or even near space
[11:07] <daveake_> My FB group for my flights is called "Dave In Space" :D
[11:07] <daveake_> Should really be "Dave wishes he could be an astronaut but this is as close as he'll ever get"
[11:08] <daveake_> But that's too long
[11:08] <BrainDamage> I think it's ikarus' myth that generates the misconception
[11:08] <BrainDamage> ikarus flew enough high that sun melted the wax
[11:09] <zyp> l
[11:10] <jgrahamc> Actually, just above the stratosphere there's the Hollywood control pyrosphere that sets fire to all returning spacecraft.
[11:12] <daveake_> ah
[11:17] <nosebleedKT> daveake: I send you a request :P
[11:18] <daveake_> Added :)
[11:19] <nosebleedKT> haha
[11:19] <cuddykid> woohoo, carbon fibre rods on their way thanks to flying wings :D
[11:19] <cuddykid> the guy also offered to build me a plane or wing :O
[11:19] <daveake_> :-). I have some for my helis.
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[11:34] <UpuWork> jgrahamc there is one of those in ravines too that sets fire to cars that crash into them
[11:35] <gonzo_> I thought all cars had bags of petrol with pyro's, just in case they fell off a cliff?
[11:36] <BrainDamage> not just cars, as anime teaches us, the explosive power of an object is directly proportional to the size of it
[11:36] <BrainDamage> tokyo being the largest known so far
[11:37] <gonzo_> should they also have anti gravity, that lasts just till the person realises that there is nolonger any ground?
[11:37] <SpeedEvil> Isn't it generally only boobies that have antigravity in anime/
[11:43] <gonzo_> hehe, jogging women have the same effect for an instant
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[11:43] <Laurenceb> cuddykid: just buy their v trainer
[11:46] Nick change: benoxley -> ben_apex
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[12:54] <cuddykid> WillDuckworth: what are the prospects for weekend launch looking like?
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[13:22] <eroomde> jgrahamc: do you have a red bat-phone that connects you to paul graham or something?
[13:31] <WillDuckworth> hey cuddykid, was afk. not looking good so will use the time to test everything further instead
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[13:43] <cuddykid> WillDuckworth: yeah, that's a good idea unless you want to retrieve from Belgium!
[13:43] <WillDuckworth> yeah, or in addition, sunday looks a wet landing
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[13:54] <cuddykid> WillDuckworth: whilst I'm waiting for next bits & pieces for glider I'm turning attention to next payload - trying to get that ready to go asap. Launch target is Feb/March/April
[13:54] <WillDuckworth> good stuff. are you still looking at that 9DOF module?
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[14:09] <cuddykid> WillDuckworth: yep, almost certainly going to buy one now. A guy from flying wings has got in contact and said he would love to build the airframe for glider - he's going to build a custom flying wing to use along with the one I'm creating. The flying wing certainly will need an IMU seen as it's so inherently unstable!
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[14:17] <Zuph> /ns identify password
[14:17] <Zuph> damnit
[14:17] <Zuph> now I have to change my super secure password
[14:20] <fsphil> muhahaha
[14:20] <fsphil> I iz hackin ur ircs
[14:20] <Zuph> hah
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[14:25] Action: UpuWork lols at Zuph
[14:26] <SparxEtch> I created some internal software and set everyones password to changeme
[14:27] <SparxEtch> I found out only about 4 people actually changed it
[14:27] <SpeedEvil> haha
[14:27] <fsphil> we got tired of rubbish passwords so we generate them now
[14:27] <SpeedEvil> Import a list of the leaked various passwords, and ask if they're the person the account is linked to, on reciept of an unusal matching password.
[14:30] <SparxEtch> Yeah, same here
[14:31] <SparxEtch> I just assign a password of random length over 12
[14:31] <cuddykid> oooo
[14:32] <SparxEtch> I even made a little warning that said "You are using the default password! Change this as soon as possible."
[14:32] <cuddykid> just seen the NTX2 HP - is 25mW allowed for airborne use?
[14:32] <gonzo_> only if you can keep the actual radiated power to 10mW
[14:33] <gonzo_> feeder loss etc
[14:34] <gonzo_> though the HP is only written on in marker pen. So I'm sure if you were to remove the pen it becomes a standard unit, right?
[14:34] <cuddykid> lol, I guess so ;)
[14:35] <cuddykid> imagine the range from 25mW
[14:35] <cuddykid> wow :P
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[14:37] <gonzo_> I'm astounded at the range we get anyway anyway.
[14:37] <SpeedEvil> Indeed
[14:37] <gonzo_> I know the maths says it should go, but to me it's like seeing a passenger jet take off. It just lloks like it shouldn't make it
[14:55] <cuddykid> new blog post - http://habexperiments.wordpress.com
[15:01] <UpuWork> cuddykid its not much more but there is a noticable difference in recieving
[15:01] <UpuWork> as I understand one did "accidentally" fly
[15:02] <UpuWork> the "perp" then fled the country
[15:02] <UpuWork> to avoid OFCOM
[15:02] <cuddykid> lol
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[15:31] <fsphil> OFCOM agents are plotting as we speak :)
[15:32] <fsphil> the 25mw module + helical antenna would probably work out better
[15:32] <fsphil> it might help reduce fading as the payload swings
[15:33] <gonzo_> a downward pointing GP is prob the best patern you will get for hab tbh
[15:33] <fsphil> wait, not helical. I'm getting my antenna terms mixed up
[15:34] <fsphil> oh wait it is
[15:34] <fsphil> something more omnidirectional than a quarter wave
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[15:40] <cuddykid> Quick question for the radio gurus - On my next flight I've got 2 radios and therefore 2 1/4 wave antennas - would it be ok to place them about 10cm apart? so possibly 2 ground radials may overlap?
[15:40] <cuddykid> I'm concerned about any mysterious things happening between the driven elements (being so close)
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[15:43] <russss> has anyone tried to see if a cross yagi reduces fading?
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[15:51] <gonzo_> I have a cross yagi but need to get to it and wire both elements
[15:51] <gonzo_> then can try
[15:52] <gonzo_> phil, a 1/4 wave gp has all the power coming out sideways and below, so is probably about as good as we will get
[15:52] <gonzo_> and simple
[15:53] <fsphil-laptop> not sure the fading can be reduced by an antenna on the ground
[15:53] <fsphil-laptop> I thought it only put out power sideways?
[15:53] <gonzo_> if the fade is due to the antenna moving so the rx station is in a null, then no
[15:53] <fsphil-laptop> I've been directly below the payload and the signal fades quite a bit
[15:54] <gonzo_> but if it is because of polarisation fading, then it's possible to do with a cross yagi or similar
[15:54] <fsphil-laptop> quadrifilar helix is what I was thinking of
[15:54] <gonzo_> qfh, that would be worth trying
[15:55] <fsphil-laptop> not sure what kind of polarisation it has though
[15:55] <gonzo_> though to get most benifit you would need circularly polarised antehhas on the ground too
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[15:55] <gonzo_> circular
[15:55] <fsphil-laptop> aah
[15:55] <gonzo_> if you use a linear pol antenna on the ground you will only rx half the power
[15:55] <fsphil-laptop> I never understood how circular polarisation works
[15:56] <fsphil-laptop> but then I still don't really understand radio waves
[15:56] <gonzo_> but an axial mode helix is probably the easiest antenna to build
[15:56] <fsphil-laptop> would that not be too directional?
[15:57] <fsphil-laptop> I suppose it could be made really short
[15:57] <gonzo_> if you think of the em wave coning out of the antenna like a ribbon, then think of the ribbon being twisted along it's length
[15:57] <gonzo_> not a helical like a stubby hendheld antenna
[15:58] <gonzo_> but a long spring about a ft in diam
[15:58] <gonzo_> with a reflector of chicken wire 9or similar) at one end
[15:58] <fsphil-laptop> would it need to be that long for 434mhz?
[15:59] <gonzo_> http://www.uhf-satcom.com/rx/
[15:59] <gonzo_> there are some pics on there
[16:00] <gonzo_> They can be a bit bulky, but are so easy to make
[16:00] <gonzo_> mine is a bit of 2x2 with copper pipe held on with cable clips
[16:01] <gonzo_> you can always take it apart when finished
[16:01] <fsphil-laptop> a helical antenna would be best for the ground stations then
[16:02] <gonzo_> well, they are circularly pol, so will work with a cp transmission from the air. Also they will work with a linear transmission and won't care what polarisation is being used at the tx
[16:03] <gonzo_> so if the balloon swinds, the pol changes and you won't even notice
[16:03] <fsphil-laptop> but with half the gain?
[16:03] <gonzo_> only thing they will not do is receive the wring sense of polarisation. As CP has a left hand and right hand, bit like a screw tthread
[16:04] <gonzo_> nope they will rx just as much power from a linear tx as a CP tx
[16:04] <gonzo_> if you tx circular and rx linear, then the linear rx will only see half the power
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[16:06] <gonzo_> cp signals will have a vertical and horisontan component (think of it like resolving forces)
[16:07] <gonzo_> and if you only rx the signals from one polarisation, you will only get half the signal
[16:07] <gonzo_> difficult to describe without diagrams
[16:08] <fsphil-laptop> yea
[16:10] <Laurenceb> http://www.youtube.com/watch?feature=player_detailpage&v=LExMC5buoFg#t=36s
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[17:36] <cuddykid> soldering time
[17:36] <cuddykid> off to the *freezing* garage
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[17:57] <cuddykid> done :D
[17:58] <cuddykid> uplink easyradio soldered onto the flight computer board
[18:03] <Dan-K2VOL> anyone see who did the balloon for that iPad case drop test?
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[18:10] Nick change: daveake__ -> daveake
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[18:18] <daveake> jcoxon Launch still on for tomorrow?
[18:20] <jcoxon> yeah
[18:20] <jcoxon> though its a bit windy
[18:20] <jcoxon> i think we'll cope
[18:20] <daveake> excellent
[18:20] <jcoxon> 1400
[18:21] <jcoxon> payload will only last 7hrs
[18:21] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[18:22] Topic changed on #highaltitude by jcoxon!jcoxon@87.113.166.40: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders etc) www.ukhas.org.uk PicoAtlas6 MK2 launch 7/1/12 1400
[18:22] <navrac_> the winds been really low today round here
[18:23] <jcoxon> navrac_, you able to track?
[18:23] <navrac_> yep, got a replacement receiver - still looking for a section of my mast
[18:23] <jcoxon> hooray
[18:23] <jcoxon> need to recruit some belgium listeners
[18:24] <navrac_> but should be on for tracking. Although there ris a big hill between us so I dont think I can get anything till 500m+
[18:24] <jcoxon> fair enough
[18:25] <navrac_> i checked it on radiomobile and looked at the path - I thought suffolk was meant to be flat
[18:25] <jcoxon> yeah there is that
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[18:25] <navrac_> did the antenovas show up in the end?
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[18:26] <jcoxon> navrac_, they've been shipped
[18:26] <jcoxon> 2 days ago
[18:26] <daveake> jcoxon did you get all your fsa03's?
[18:28] <jcoxon> daveake, no not yet
[18:28] <jcoxon> need to email them
[18:28] <jcoxon> i saw they arrived for you
[18:28] <daveake> They were showing 7 in stock over Xmas. ISTR you ordered 4, and I ordered 2, so I was hoping you'd not cleared them out before they processed my order :)
[18:28] <navrac_> mine shouldnt be too far behind then - i came across a site that had an arduino+rfm on it and thought about doing a stacking board for it - then noticed in the comments you'd already seen it - I felt like a stalker
[18:28] <daveake> Got mine yesterday ....
[18:28] <jcoxon> navrac_ hehe
[18:28] <jcoxon> daveake, they are particularly rubbish
[18:29] <daveake> I've ordered twice and no probs yet ,.,
[18:29] <jcoxon> eek
[18:29] <jcoxon> better check my address
[18:30] <daveake> :)
[18:32] <jcoxon> yeah correct address
[18:33] <daveake> Suffolk mail maybe
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[18:33] <daveake> Actually no .... they use a courier
[18:33] <daveake> I think you should chase them up :)
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[18:38] <cuddykid> keep doing that - plugging usb cable into arduino while battery pack is powering it
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[18:39] <cuddykid> result - some sort of power surge bringing up a screen saying I must hold down power button
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[19:58] <cuddykid> having a sort of problem with serial buffering
[19:59] <daveake> Go on ....
[20:00] <cuddykid> with the uplink I'm implementing
[20:00] <cuddykid> ...
[20:00] <cuddykid> it's currently storing in NSS buffer everything it's receiving
[20:01] <cuddykid> however the call to read 1 uplink string (which is defined to start with '$' and end with '*') only occurs every few seconds due to other things being processed
[20:01] <fsphil-laptop> can you increase nss's buffer size?
[20:02] <cuddykid> so currently what is happening is there is relatively old data being stored and processed on each run (getting older with each new pass through)
[20:02] <cuddykid> problem is -
[20:03] <cuddykid> I want to only read the *last* string received on each pass
[20:03] <fsphil-laptop> double buffer?
[20:03] <cuddykid> rather than a string way back when
[20:03] <cuddykid> I've tried flushing the buffer right before but that doesn't work as there is nothing then in the buffer, is there a way to run through the buffer?
[20:04] <daveake> So you need some code to scan through the buffer for the latest $...* string
[20:04] <cuddykid> i.e. if buffer is an array then I could run through it to find the very last '$' and then read that and then flush buffer
[20:04] <cuddykid> daveake: yup
[20:04] <fsphil-laptop> ahh
[20:05] <daveake> Or if the code is quick enough just call it until it reports no more messages
[20:05] <fsphil-laptop> can't you loop the code that processes the string
[20:05] <daveake> ^^^
[20:05] <daveake> :)
[20:05] <fsphil-laptop> what daveake said ;)
[20:05] <cuddykid> because - I want to try and accurately find out when the last altitude an uplink was received
[20:05] <daveake> lol
[20:05] <fsphil-laptop> daveake, I think we just created an infinite loop
[20:05] <cuddykid> ahh
[20:05] <cuddykid> yes
[20:05] <cuddykid> I could :P
[20:05] <cuddykid> thanks!
[20:05] <daveake> fsphil-laptop, I think we just created an infinite loop
[20:05] <cuddykid> lol
[20:06] <daveake> Other question comes to mind .... what are you doing that takes all those seconds?
[20:07] <cuddykid> daveake: running the other processes (which doesn't take much time) and sending rtty (which takes a few secs)
[20:08] <daveake> Put the rtty on a timer int
[20:09] <daveake> If you really really really couldn't do that, you could do one RTTY character, then do your other bits, then do the next. But I'd do the interrupt stuff no question.
[20:09] <fsphil-laptop> for the hams here, what's the idea behind this: 144.8750 MHz TCP/IP user access
[20:10] <cuddykid> dakeake: good idea
[20:10] <fsphil-laptop> yea, interrupt rtty is great
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[20:16] <cuddykid> the big while(1) loop works a treat :P
[20:25] <cuddykid> solved another possible bug - If I uplinked a command once then it could well have just been stored in buffer and got overwritten as buffer overflowed. So - even if command was received it was never processed and therefore never registered as received
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[20:25] <cuddykid> my big loop now cross checks everything that is received with stored action commands
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[20:46] <Laurenceb_> sup
[20:48] <Laurenceb_> cuddykid: join #rcgroups on irc.rcgroups.com
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[21:01] <cuddykid> Laurenceb_: cheers :D
[21:12] <NickB1> any experience with sdlib ?
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[21:33] <Lunar_Lander> good evening
[21:33] <Upu> evening Lunar_Lander
[21:33] <Lunar_Lander> how is the life?
[21:34] <Upu> not bad at all hows you ?
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[21:36] <Lunar_Lander> I'm good, thanks
[21:36] <Lunar_Lander> but I got a humble request that might show me a bit stupid
[21:37] <Upu> shoot
[21:37] <Lunar_Lander> I'd need James May one final time
[21:37] <Upu> sure
[21:37] <Upu> http://www2.upuaut.net/james.mays.man.lab.s02e03.hdtv.xvid-ftp.avi
[21:39] <Lunar_Lander> thanks
[21:39] <Lunar_Lander> :)
[21:39] <daveake> I still have it on the TV recorder box :)
[21:39] <fsphil-laptop> snap
[21:39] <fsphil-laptop> silly thing doesn't let me copy HD recordings
[21:39] <Lunar_Lander> :)
[21:39] <gonzo__> is that edited or the full episode?
[21:40] <Lunar_Lander> and I prepared myself upu
[21:40] <Lunar_Lander> I'm sitting here with a CD-R
[21:40] <daveake> fsphil-laptop - Humax?
[21:40] <Upu> full episode
[21:40] <fsphil-laptop> actually it does let me copy HD recordings, but it encrypts them
[21:40] <Lunar_Lander> so that I won't have to bother you again :)
[21:40] <fsphil-laptop> daveake, aye
[21:40] <gonzo__> rgr
[21:40] <daveake> Same
[21:40] <fsphil-laptop> daveake, what's the menu speed like on yours?
[21:40] <fsphil-laptop> my biggest complain is the laggy menu / interface
[21:41] <fsphil-laptop> +t
[21:41] <daveake> Yes, awful.
[21:41] <fsphil-laptop> drat
[21:41] <fsphil-laptop> I was hoping it was just mine
[21:41] <fsphil-laptop> I'm replacing the sky+ box soon, was hoping they'd fixed that
[21:41] <daveake> Delete file takes minutes and you can't delete another till it's done. Ridiculous.
[21:41] <fsphil-laptop> in a newer model
[21:41] <fsphil-laptop> that too
[21:41] <fsphil-laptop> though you can delete an entire folder in one go
[21:42] <daveake> Yes
[21:42] <fsphil-laptop> not sure why they don't do what sky does, mark it as deleted and let you work away
[21:42] <daveake> Or tag then delete
[21:42] <daveake> Exactly
[21:42] <fsphil-laptop> but the laggy interface rules it out of replacing the sky box. will need to find something else
[21:43] <daveake> Just been to the gym. They've got a new machine in. Only used it for half an hour, as I started to feel sick ....
[21:43] <daveake> .... It's great though. It does everything  Kit Kats, Mars Bars, Snickers, Potato Crisps, the lot....
[21:43] <fsphil-laptop> +1
[21:43] <daveake> (stolen from FB)
[21:43] <Upu> my bad joke detector just went off
[21:44] <daveake> I'll wear that out
[21:45] <fsphil-laptop> http://www.youtube.com/watch?v=FJkp9d6f1_0
[21:46] <daveake> classic :)
[21:50] <Upu> lol
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[21:54] <fsphil-laptop> and totally random: http://www.youtube.com/watch?v=NbwpgyRUv5g
[21:56] <Upu> lol
[21:57] <Lunar_Lander> and stacey has been engaged five times!
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[22:27] <Lunar_Lander> btw
[22:27] <Lunar_Lander> to come back to electronics
[22:27] <Lunar_Lander> today I learned that there are resistors made of concrete
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[22:27] <Laurenceb_> http://www.google.com/url?sa=t&rct=j&q=silent%20sentry&source=web&cd=2&ved=0CCoQFjAB&url=http%3A%2F%2Fservv89pn0aj.sn.sourcedns.com%2F~gbpprorg%2Fmil%2Fradar%2Fsentry.pdf&ei=W2kHT4_GKcbPsgbGhcSBDw&usg=AFQjCNFAEiyFFpCswN7ZJojUk693wupjEA&cad=rja
[22:28] <SpeedEvil> Seems like a fairly poor choice.
[22:31] <SpeedEvil> Interesting
[22:31] <Darkside> ahh yes, FM radio passive radar
[22:32] <Darkside> rock music has a better ambiguity function than other music
[22:33] Nick change: UpuHome -> Upu
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[22:49] <fsphil-laptop> someone built a passive radar that could detect aircraft a while back
[22:49] <fsphil-laptop> used tv broadcasts, and USRPs
[22:52] <Laurenceb_> i was thinking of trying to use thermal emission
[22:52] <Laurenceb_> at short range - for detecting people in buildings
[22:53] <Darkside> fsphil-laptop: i
[22:53] <Darkside> ack
[22:53] <Darkside> i've done a bit of work on a system that uses DAB
[22:53] <Darkside> its horrendously compliated to get going
[22:53] <Darkside> getting rid of the direct signal is a PITA
[23:01] <fsphil-laptop> I remember you talking about the dab one
[23:02] <Lunar_Lander> today I picked this from my cupboard: http://www.sparkfun.com/products/8741
[23:02] <Lunar_Lander> :)
[23:03] <fsphil-laptop> the girl?
[23:03] <Lunar_Lander> no
[23:03] <Lunar_Lander> the pullover
[23:03] <fsphil-laptop> phew
[23:05] <Laurenceb_> Darkside: you need http://www.dinigroup.com/new/DNDPB_S327.php
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[23:09] <Darkside> Laurenceb_: lol
[23:10] <SpeedEvil> I guess DAB is hard because of the modulation.
[23:10] <SpeedEvil> FM might be somewhat easier
[23:10] <SpeedEvil> As it's glacially slow
[23:10] <Laurenceb_> http://www.dinigroup.com/new/DNBFC_S12_12_Cluster.php
[23:10] <fsphil-laptop> just opened a 524 byte webpage via ax25 packet -- took about a minute
[23:10] <Darkside> fsphil-laptop: haha
[23:11] <SpeedEvil> ha.
[23:11] <Darkside> you can watch the packets go back and forth on ax25
[23:11] <fsphil-laptop> they kept colliding
[23:19] <Laurenceb_> lol
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[23:42] <Laurenceb_> http://b737home.blogspot.com/
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[23:52] Nick change: ben_apex -> benoxley
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[23:57] <joph> Laurenceb, wow, crazy :D
[00:00] --- Sat Jan 7 2012