highaltitude.log.20151109

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[01:34] <SpacenearUS> New vehicle on the map: 03OK1LPD-11 - 12http://tracker.habhub.org/#!qm=All&q=OK1LPD-11
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[06:14] <SpacenearUS> New vehicle on the map: 03SA0BSV_chase - 12http://tracker.habhub.org/#!qm=All&q=SA0BSV_chase
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[08:19] <SpacenearUS> New vehicle on the map: 03sabrina133_chase - 12http://tracker.habhub.org/#!qm=All&q=sabrina133_chase
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[11:56] <LunarWork> hello
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[11:59] <fsphil> hallo
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[12:26] <LunarWork> hm
[12:26] <LunarWork> does the MTX2 work just like the NTX2B?
[12:27] <craag> As far as I understand it, it's basically an NT2B-FA, split in half and stacked.
[12:27] <craag> *NTX2B-FA
[12:29] <LunarWork> ah thanks
[12:29] <LunarWork> cool!
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[13:34] <adamgreig> don't think it's even stacked craag?
[13:34] <adamgreig> it's just, the ntx2b is the same size as the ntx2, which is much much bigger than it needs
[13:36] <mattbrejza> i think they are stacked from a pic i saw..?
[13:38] <adamgreig> huh
[13:38] <adamgreig> maybe there's a small pcb inside
[13:39] <adamgreig> but it seemed like the can on top was not quite as big as the pcb
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[13:40] <mattbrejza> oh im talking mtx2 vs ntx2
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[13:46] <LunarWork> thanks for the infos
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[13:56] <infaddic_> hi guys, anybody any experience with a XiaoMi Yi camcorder? Gets good reviews and only £42 shipped from China. http://www.gearbest.com/action-cameras/pp_153557.html
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[14:21] <Laurenceb> so according to slashdot, Reaction engines is a LaRouche front organisation
[14:21] <Laurenceb> eroomde is in a cult
[14:22] <eroomde> link me
[14:22] <Laurenceb> comment removed :P
[14:23] <Laurenceb> basically Alan Bond -> Daedalus -> Schiller Institute
[14:23] <Laurenceb> JFK <-> (/11
[14:23] <Laurenceb> *9/11
[14:23] <eroomde> yes i was with you until daedalus
[14:23] <eroomde> alan did that for a bit of fun
[14:24] <eroomde> and because he was fed up with people designing all these things with nosecones
[14:24] <Laurenceb> haha
[14:24] <eroomde> 'as if newtonion aerodynamics has anything to do with anything at 0.3C'
[14:25] <Laurenceb> https://en.m.wikipedia.org/wiki/21st_Century_Science_and_Technology#21st_Century_Science_and_Technology
[14:25] <Laurenceb> apparently lots of Daedalus stuff is in there
[14:25] <Laurenceb> " it is published by supporters of Lyndon LaRouche"
[14:26] <eroomde> nice
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[14:29] <Laurenceb> holy shit Eric Lerner
[14:29] <Laurenceb> I knew he was insane, just not that insane
[14:31] <Laurenceb> http://www.vision.org/visionmedia/uploadedImages/Home/Articles/Science_and_Environment/Articles/Eric%20Lerner1%281%29.jpg
[14:31] <Laurenceb> totally doesnt look unhinged
[14:33] <Laurenceb> guy behind this http://lppfusion.com/news-and-archives/
[14:41] <Laurenceb> https://mikebhopkins.wordpress.com/2012/06/20/why-lawrenceville-plasma-physics-results-are-not-even-wrong-a-detailed-analysis/
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[17:07] <SpacenearUS> New position from 03AIRCOR-51 after 036 days silence - 12http://tracker.habhub.org/#!qm=All&q=AIRCOR-51
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[17:27] <SpeedEvil> https://en.wikipedia.org/wiki/Paris_Gun
[17:29] <Laurenceb> argggg
[17:29] Action: Laurenceb bangs head on table
[17:29] <Laurenceb> I submitted a journal article on laser doppler blood flow measurement
[17:30] <Laurenceb> its been rejected, as one referee got confused by the into and interpreted the entire rest of the paper as referring to a single blood vessel rather than bulk tissue
[17:30] <SpeedEvil> How is bloodflow affected by banging your head on table?
[17:30] <Laurenceb> facepalming hard
[17:30] <Laurenceb> lul
[17:30] <SpeedEvil> Oh dear.
[17:30] <Laurenceb> *intro
[17:31] <mattbrejza> resubmit and wait another 5 months to hear back then?
[17:31] <SpeedEvil> Is it misreadable, or is he very very stupid?
[17:31] <SpeedEvil> (assuming for the moment it is he)
[17:31] <Laurenceb> <mattbrejza> yes, took 6 months to hear back
[17:31] <Laurenceb> english as a second language
[17:31] <Laurenceb> he is from Malta
[17:31] <SpeedEvil> ah
[17:32] <Laurenceb> I suspect strongly anyway
[17:32] <SpeedEvil> Maltesers tend to be lightweights.
[17:32] <Laurenceb> referees are supposed to be anonymous
[17:34] <chris_99> can you complain to the journal?
[17:35] <SpeedEvil> Is there a procedure for 'you have entirely misread this' ?
[17:35] <mattbrejza> i would have thought the editor should notice that the reviewers were disagreeing
[17:36] <Laurenceb> yeah I got an email from the editor
[17:36] <Laurenceb> referees just said "substantial corrections"
[17:36] <Laurenceb> then editor rejected it
[17:36] <Laurenceb> academic publishing sucks :-/
[17:36] <SpeedEvil> Have any actually picked up substantive errors?
[17:37] <Laurenceb> not yet - comments are even longer than the publication
[17:37] <mattbrejza> lol really?
[17:37] <Laurenceb> lots of "this could be improved in this way, but the present approach is acceptable on balance"
[17:37] <Laurenceb> about 7pages of comments
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[17:43] <Lunar_Lander> evening
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[20:03] <arjunnaha> Out of interest, are there any pre-built antenna, payload size for 434
[20:04] <arjunnaha> I've seen daveake and Upu use them, where do you get them from?
[20:04] <daveake> lprs.co.uk
[20:04] <Upu> my shop
[20:04] Action: daveake deletes last post
[20:05] <Upu> wrong answer daveake go sit in the corner
[20:05] <Upu> them or
[20:05] <Upu> http://ava.upuaut.net/store/index.php?route=product/product&path=71_66&product_id=118
[20:05] <daveake> I am
[20:05] <daveake> Didn't know :)
[20:05] <Upu> no its buried
[20:05] <Upu> but your own 1/4 wave is better
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[20:13] <arjunnaha> You mean this imgur.com/kQT69IJ
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[20:15] <daveake> s/is/should be/
[20:19] <Upu> heh
[20:19] <Upu> all the solder
[20:23] <SpacenearUS> New vehicle on the map: 03AVA - 12http://tracker.habhub.org/#!qm=All&q=AVA
[20:27] <arjunnaha> wanted to make sure it had contact ;-)
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[21:06] <arjunnaha> What camera angles would you use in a payload?
[21:07] <Upu> good question
[21:07] <Upu> out of the side angled down ever so slightly (don't worry about this just stick it out the side)
[21:08] <mattbrejza> looking at the balloon but with the payload in shot is a good one someone did on a launch we helped with recently
[21:08] <daveake> not tried that one yet
[21:09] <mbales_> i really want to find a decent 360 degree camera
[21:09] <Chimpusmaximus> Any tried the kodak 360 one?
[21:10] <Chimpusmaximus> anyone
[21:11] <mbales_> i hadnt seen that before
[21:11] <mbales_> looks interesting
[21:11] <Chimpusmaximus> i'm sure i seen someone use one
[21:11] <daveake> The one I tried was shite
[21:11] <mbales_> not a big fan of having to use their software but migh tbe worth a shot
[21:12] <mbales_> not even horribly expensive either
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[21:42] <Geoff-G8DHE_> mbales_, These are consider quite good quality http://us.ricoh-imaging.com/products/theta-series/
[21:43] <Geoff-G8DHE_> No idea about its battery life at low temp but better than most on the market
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[21:46] <mbales_> i looked into thsoe and did a live demo with one at last years maker faire
[21:46] <mbales_> trouble is the 25 minutes of record time avilable
[21:46] <mbales_> nigh useless
[21:47] <chris_99> someone mentioned the xiomi (sp?) earlier, what's the record time on that
[21:48] <mbales_> that thing is ugly as sin
[21:49] <mbales_> way too heay for my liking
[21:49] <chris_99> ah
[21:49] <Geoff-G8DHE_> Depends if you want video or stills, you may find that Spherical 360 rapidly looses its appeal after a few minutes simply because there can be too much going on!
[21:55] <mbales_> my goal is to be able to view a flight with an oculous rift
[21:57] <chris_99> at what fps/res?
[21:59] <mbales_> hadnt really put too much thought into it, Ive got the first gen oculous so i think its VGA anyway
[22:00] <chris_99> are you in the UK, it just seems it'd be really hard with the bandwidth available
[22:00] <mbales_> nope in santa barbara CA
[22:01] <chris_99> ah so you can use all kind of fancy stuff i guess
[22:01] <mbales_> im not looking to do a live stream, id recover it and download the video after the flight
[22:01] <chris_99> oh i misunderstood what you meant then
[22:01] <mbales_> a live stream would be way too much work
[22:01] <mbales_> we tried a live stream over 2.4ghz once
[22:02] <chris_99> cool, work ok?
[22:02] <mbales_> for a short time
[22:02] <chris_99> neat
[22:02] <mbales_> we didnt have any sort of automated antenna aimer
[22:02] <mbales_> so we lost it pretty quikc
[22:02] <mbales_> we have one now though, maybe ill try it again
[22:02] <chris_99> are you planning on using multiple cameras then, to actually to the head tracking thing
[22:02] <chris_99> with the rift
[22:02] <chris_99> *to actually do
[22:03] <mbales_> ideally itd be one 360 or close to it camera
[22:03] <mbales_> i try and fly really lightweight whenever possible
[22:03] <mbales_> my last dozen flights have been sub 1 pound
[22:04] <mbales_> or half a kilometer in metric
[22:08] <chris_99> hows a 360deg camera work, with multiple sensors?
[22:09] <SpeedEvil> yes.
[22:09] <SpeedEvil> Or an eleven billion dollar lens.
[22:09] <chris_99> heh
[22:09] <mbales_> theres 2 options, big mirror / lens or lots of sensors
[22:09] <chris_99> the only kind ive seen is http://petapixel.com/2013/11/12/panono-camera-ball-captures-360-degree-images-mid-air/
[22:09] <chris_99> wouldn't a mirror give only 180 deg
[22:10] <mbales_> you can get closer to 270
[22:10] <SpeedEvil> http://petapixel.com/2014/11/15/sample-footage-shot-legendary-nikkor-6mm-f2-8-can-see-behind/
[22:10] <chris_99> oh like a curved mirror
[22:10] <mbales_> aye
[22:10] <SpeedEvil> 'About once per year, one of the rare Nikkor 6mm f/2.8 lenses out there pops up on eBay when some camera shop or another picks one up. The price ranges from $60K to $160K and its gotten to the point where we usually just ignore the listings because& well& weve covered them enough times.
[22:10] <chris_99> i'll take 2
[22:11] <chris_99> http://www.360facil.com/eng/360-degree-photo-shot-parabolic-mirror.php
[22:12] <SpeedEvil> That is not the above
[22:12] <SpeedEvil> It's significantly narrower and has a major artifact
[22:13] <chris_99> that's just one i found that uses a mirror
[22:13] <SpeedEvil> yes
[22:14] <chris_99> it'd be awesome, although a very bad idea, if you could drop one of those 360 deg ball cameras from near space (provided it didn't hit someone on the head)
[22:15] <mbales_> haha, and hoping it would survive the impact
[22:15] <chris_99> mmm
[22:16] <mbales_> need one of those nasa inflatable airbags they used on those mars rovers
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[22:18] <chris_99> heh yeah, you could buy a load of car airbags from fleabay, and detonate at a certain altitude
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[22:19] <mbales_> man that would be fun to see
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[22:22] <mbales_> since people are here and responding anyone played ith the si4455 transceiver?
[22:24] <chris_99> have you also looked at http://www.silabs.com/products/wireless/EZRadioPRO/Pages/Si446x.aspx it seems it has moar features
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[22:26] <mbales_> im actually working with the ezr32lg330 which integrates an arm m3 and si4455 so no hope of an upgrade atm
[22:26] <chris_99> ah
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[22:27] <chris_99> that's pretty cool that it's got an arm, how much does that cost out of interest
[22:27] <daveake> a leg
[22:28] <mbales_> +/- a finger or two
[22:28] <chris_99> heh
[22:28] <mbales_> 5$ a chip
[22:28] <mbales_> they have a devkit which is $200 for a pair of boards
[22:29] <chris_99> nice, i just ordered one of the modules with the si446, but maybe a wireless mcu would have been better
[22:30] <mbales_> thats what im hoping to find out
[22:30] <mbales_> fun part will be generating AFSK with it
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[22:30] <chris_99> not sure what you mean, isn't it FSK?
[22:31] <mbales_> its very similar
[22:31] <mbales_> essentially the same for most purposes
[22:31] <mbales_> except for APRS as i understand it anyway
[22:32] <chris_99> hmm i'm confused what the difference is 'AFSK differs from regular frequency-shift keying in performing the modulation at baseband frequencies' - i don't get what that means
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[22:33] <mbales_> it took me a lot of melon scratching to get it as well
[22:33] <mbales_> and im not sure i even really understand it well enough to explain it
[22:33] <chris_99> does it mean, it's not shifting the carrier frequency
[22:34] <mbales_> yes thats the one
[22:35] <mbales_> i wish the US had a proper digital system like it sounds like the UK uses
[22:38] <gonzo_nb> fsk, you are shifting the actual transmitted carrier, up and down the band, to send the 1's and 0's
[22:39] <chris_99> is afsk changing an audio tone then, that could use any modulation scheme for the radio stuff, like am,fm, etc.
[22:39] <gonzo_nb> on afsk, you are sending an audio tone in fm. That means that as the audio signal goes + and - in a sine wave, the carrier signal is moving up and down the ban in sympathy
[22:39] <chris_99> could you also use am etc?
[22:40] <Lunar_Lander> good night!
[22:40] <gonzo_nb> to send the data, you shift the frequency of the audio tone
[22:40] <gonzo_nb> chris_99, yes, that is correct
[22:40] <chris_99> sweet, that makes sense then
[22:40] <chris_99> cheers!
[22:41] <gonzo_nb> you could send afsk over any channel that you can send audio
[22:41] <chris_99> so i don't think you could use that chip for AFSK then or could you
[22:41] <chris_99> as the chip does FSK itself
[22:41] <gonzo_nb> chip? Not seen the history of the chat
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[22:42] <chris_99> oh sorry si4455 was the one mbales_ was talking about
[22:42] <mbales_> i have a sneaky idea for how to do it, dont want to give too much away yet but if it works i will publish it
[22:42] <chris_99> ah heh
[22:42] <gonzo_nb> if you can make an fsk modulator move up and down at an audio freq (preferable sweeping, rather than stepping) you could FM modulate a tone
[22:42] <gonzo_nb> then just change the tone freq to key
[22:42] <gonzo_nb> data
[22:43] <mbales_> thats most of the idea
[22:43] <chris_99> so APRS uses AFSK?
[22:43] <mbales_> yes
[22:44] <gonzo_nb> yes
[22:44] <chris_99> even in europe too?
[22:44] <mbales_> as i understand it
[22:45] <chris_99> aha, isn't that a bit backwards?
[22:45] <gonzo_nb> just as an aside.... If you send a single tone throu an ssb transmitter, you will get a single rf carrier. If you move the tone, this will move the carrier. So a common way of generating FSK with an amateur set (which usually don't have a direct data fsk input) is to put an audio tone in and key that.
[22:46] <gonzo_nb> yes ax25 on vhf/uhf is afsk
[22:47] <gonzo_nb> the reverse of the above is true on rx. You listen to an fsk signal on ssb, you will hear an audio tone, which changes as the carrier freq changes. Which is how fl-digi works for us
[22:47] <chris_99> mmm, yeah i've done that with a scanner, to hear the sounds
[22:47] <gonzo_nb> aprs uses the ax25 fm/afsk standard
[22:47] <chris_99> is there not a digital equivalent?
[22:48] <gonzo_nb> how do you mean?
[22:48] <chris_99> i mean something that uses FSK
[22:48] <chris_99> instead
[22:49] <gonzo_nb> nope, because ar sets don't usually have data outputs. mainly just audio out
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[22:49] <chris_99> ah that makes sense
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[22:50] <gonzo_nb> actualklu, that is not so true these days. lots do have a direct data in/out. But the aprs std pre-dates this
[22:50] <chris_99> although you can listen to FSK with a scanner/radio can't you
[22:51] <chris_99> and it outputs tones
[22:51] <gonzo_nb> it's commonly used for 9600 bd packet
[22:51] <gonzo_nb> with an fm scanner, you will hear fsk, but the audio filtering ruins it
[22:52] <gonzo_nb> if you could cut into the discriminator cct, you could get a real fsk output
[22:52] <gonzo_nb> that was common to have to do in the earlier days of 9600bd packet
[22:53] <chris_99> by real, you mean digital, or..?
[22:55] <gonzo_nb> yep, the 9600db would have a direct connection to the fm modulator, so you can fsk it, rather than having to put audio into the mic
[22:55] <gonzo_nb> and similar on rx
[22:56] <chris_99> ah neat
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[22:59] <gonzo_nb> wonder if anyone uses 9600 bd these days?
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[00:00] --- Tue Nov 10 2015