highaltitude.log.20151027

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[02:03] <BeaverOne> https://www.youtube.com/watch?v=gxaHl7KPV1Q (started some wind simulations on a typical parafoil)
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[02:04] <mbales> now i really want spaghetti
[02:06] <BeaverOne> heh
[02:06] <BeaverOne> i admit that simulation is totally worthless
[02:11] <BeaverOne> mbales: ever used PPM SUM or CPPM (technically ccpm "Cyclic/collective pitch mixing") data from a RC RX ?
[02:12] <mbales> I cant say that I have
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[02:30] <mbales_> my kickstarter is half way funded, woo
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[06:03] <SpacenearUS> New position from 03TENPARTS1 after 03a day silence - 12http://tracker.habhub.org/#!qm=All&q=TENPARTS1
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[11:01] <Laurenceb> http://hackaday.com/2015/10/27/youre-never-too-young-to-be-a-rocket-scientist/
[11:02] <Laurenceb> this guy is annoying
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[11:09] <eroomde> i can just imagine him giving that presentation infront of alan bond
[11:09] <eroomde> ten seconds in, "young man, why don't you take off that hat and then continue"
[11:11] <adamgreig> has that actually flown/
[11:11] <Laurenceb> i seriously doubt it
[11:11] <adamgreig> doing the attitude while it's stationary and you're rotating the sensors in your hand is well and good
[11:11] <adamgreig> likewise making fins out of paper
[11:12] <eroomde> i don't think there's any question that it's flown
[11:12] <eroomde> look at it
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[12:03] <SpacenearUS> New vehicle on the map: 03R2AGQ-11 - 12http://tracker.habhub.org/#!qm=All&q=R2AGQ-11
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[14:50] <SpacenearUS> New vehicle on the map: 03default_chase - 12http://tracker.habhub.org/#!qm=All&q=default_chase
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[15:12] <adamgreig> anyone have much experience in prng algorithms and stuff?
[15:12] <adamgreig> i want to generate m unique integers between 1 and n, with the choice _and_ ordering depending on the seed
[15:12] <adamgreig> 2^n, not n, sorry
[15:13] <adamgreig> and i want to do so as quick as possible and ideally without O(2^n) memory
[15:13] <adamgreig> obvious solution is to generate a list of all integers 1..2^n, shuffle, take first M
[15:13] <adamgreig> but that's slow and uses lots of memory
[15:14] <adamgreig> maximal length LFSR of size n, run for m numbers, will generate my m unique numbers 1..2^n and is very very fast, but the ordering of the output doesn't depend on the seed at all, only the position in the total sequence
[15:14] <lz1dev> xorshift ? :>
[15:15] <adamgreig> xorshift is really nice and fast, but outputs repeats
[15:15] <SpeedEvil> As a stupid suggestion, you could take a LSFR and counter and jam it into AES or something
[15:15] <richardeoin> http://www.xilinx.com/support/documentation/application_notes/xapp052.pdf has a useful list of taps for maximal length LFSRs
[15:15] <adamgreig> lfsr into aes also gives repeats I think
[15:15] <SpeedEvil> And counter
[15:15] <SpeedEvil> So you input the counter into the AES along with the LSFr
[15:15] <adamgreig> richardeoin: http://users.ece.cmu.edu/~koopman/lfsr/index.html is even better for maximal length taps, but I have plenty of those
[15:15] <adamgreig> the issue is the LFSR by itself will always output numbers in the same order, e.g. 7 will always be followed by 12, or whatever
[15:16] <adamgreig> SpeedEvil: hmm, how do you combine the lfsr and counter?
[15:16] <SpeedEvil> concatenate, as one option
[15:16] <zyp> xor or concatenate
[15:16] <zyp> but do you have a chip with an AES core?
[15:16] <adamgreig> lz1dev: xorshift + rejecting duplicates might work, but if m is close to 2^n you spend loads and loads of time rejecting duplicates
[15:16] <SpeedEvil> Or just don't bother, and stick it on a 32gb microSD
[15:17] <lz1dev> you want no duplicates?
[15:17] <adamgreig> that's why I said "m unique integers" yep
[15:17] <lz1dev> right
[15:17] <adamgreig> why would aes with lfsr+counter input give no repeated numbers?
[15:17] <SpeedEvil> Oh - the abiove wn't don that.
[15:17] <SpeedEvil> It won't.
[15:17] <adamgreig> mm
[15:17] Action: SpeedEvil misread
[15:17] <adamgreig> that requirement makes a bunch of otherwise good options not work
[15:17] <SpeedEvil> err
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[15:18] <adamgreig> and the lfsr which is otherwise amazing for this and super duper simple breaks cuz of the ordering
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[15:18] <SpeedEvil> Wait - no - it should.
[15:18] <zyp> so, what order of magnitude will n and m be?
[15:18] <SpeedEvil> For a symmetric cipher, you have to be able to invert it to the original lsfr and counter.
[15:18] <SpeedEvil> You can't xor them, but concatenation should be fine
[15:18] <kzn> hello I just entered flight docs and need them to be approved. Thanks!
[15:19] <adamgreig> "small", n around 3000 maybe and n like 12 to 18 (2^n like 4k to 262k)
[15:19] <adamgreig> kzn: please post your flight document ID in the #habhub channel
[15:20] <SpeedEvil> adamgreig: are you trying to make spreading codes?
[15:20] <adamgreig> no
[15:20] <adamgreig> trying to subsample a 2^n matrix
[15:20] <SpeedEvil> ah
[15:20] <adamgreig> well an implicit 2^n matrix transform anyway
[15:20] <SpacenearUS> New vehicle on the map: 03AIRCOR-51 - 12http://tracker.habhub.org/#!qm=All&q=AIRCOR-51
[15:22] <kzn> Sorry, will post on #habhub channel. Thanks
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[15:51] <SpacenearUS> New vehicle on the map: 03addo _chase - 12http://tracker.habhub.org/#!qm=All&q=addo%20_chase
[15:54] <SpacenearUS> New vehicle on the map: 03S1 - 12http://tracker.habhub.org/#!qm=All&q=S1
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[16:44] <SM0ULC-Reb> a bit bigger tracker, http://www.gizmag.com/world-view-completes-major-flight-test/40051/
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[17:00] <aparis1983> I was wondering if the habhub tracker automatically picks up any balloons on the APRS network the same way APRS.fi does (only filtered for balloons and chase vehicles). Reason being that I tested my APRS tracker with my SSID set to 11. My call sign popped up in APRS.fi but not on the habhub tracker.
[17:01] <adamgreig> I believe only balloons above a certain altitude get picked up
[17:01] <lz1dev> ^
[17:02] <lz1dev> unless you appear like a weather sonde, at which case you won't appear :>
[17:02] <aparis1983> That explains it. I live in Florida so I'm well below any threshold that may be
[17:02] <lz1dev> whats you callsign?
[17:02] <aparis1983> KM4DRI
[17:02] <lz1dev> .aprs info KM4DRI
[17:02] <SpacenearUS> 03lz1dev: No matches found
[17:03] <lz1dev> .aprs info KM4DRI-11
[17:03] <SpacenearUS> 03lz1dev: 03KM4DRI-11 was near 03Palm Beach County, FL, USA 10(26.815,-80.06351) at 0341 meters about 0317 hours ago - 12http://aprs.fi/info/KM4DRI-11
[17:03] <SpacenearUS> 03lz1dev: Path: 03KM4DRI-11>APRS via 03K4PKT-3,qAR,WB4MOZ-3
[17:03] <SpacenearUS> 03lz1dev: Symbol: 03/O Speed: 030kmph Course: 03219°
[17:03] <SpacenearUS> 03lz1dev: Comment: 03Ti=30/Te=107/V=4065 www.youtube.com/watch?v=tI6alFMD79I
[17:03] <aparis1983> Yep. APRS.fi picked me up....that being said, out of curiosity what's that minimum altitude?
[17:04] <lz1dev> erm
[17:04] <lz1dev> 2000m
[17:05] <lz1dev> it can be added manual if needed
[17:05] <aparis1983> Thanks!
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[20:10] <jcoxon> got a ublox 8Max module from hab supplies, getting absolutely nothing in the form of sats
[20:10] <jcoxon> my ublox 5 easily gets alock from the same position
[20:11] <jcoxon> is tehre anything to do from default to get it going?
[20:11] <jcoxon> just watching nmea output on the console
[20:12] <mclane_> do you see no output at all?
[20:12] <Lunar_Lander> hello
[20:12] <mclane_> or just messages without content
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[20:13] <jcoxon> just messages with no proper data
[20:13] <jcoxon> as in its seeing nothing
[20:13] <mclane_> I had one max8q recently which did not work - probably input stage killed by esd
[20:14] <mclane_> same symptoms
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[20:15] <mclane_> I desoldered that one and replaced by another chip - everything working fine
[20:16] <jcoxon> annoyingly i've intergrated the module
[20:16] <jcoxon> still able to get it out but its not going to be as pretty
[20:17] <mclane_> yea that is bad
[20:18] <mclane_> normally the max8q is quite sensitive - you should get a fix quickly
[20:19] <jcoxon> yeah i suspected that
[20:30] <mbales_> ive been using max m8qs on my stuff and occasionally had 30+ min fix times
[20:35] <Upu> yo jcoxon
[20:35] <Upu> chip antenna one ?
[20:39] <jcoxon> yeah
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[20:44] <Upu> I'll send you a new one tommorrow
[20:44] <Upu> when you say "integrated" how much stuff is round it ?
[20:46] <jcoxon> hehe just a 4 pin header connecting it to a board
[20:46] <jcoxon> have you had issues with the 8max?
[20:46] <Upu> no but people have. The chip antenna struggles when anything is near it
[20:47] <Upu> got a pic ?
[20:48] <jcoxon> deconstructed now
[20:48] <jcoxon> :-(
[20:52] <Upu> ok try it away from everything
[20:52] <jcoxon> i'll rig it up to wires
[20:52] <Upu> rgr
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[20:58] <eroomde> this chap james has a campervan too, so ideal habmobile
[20:58] <eroomde> can take big He cylinders
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[21:16] <gonzo_nb> and make bacon butties
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[23:41] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
[23:43] <gonzo_nb> seen that one before?
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[00:00] --- Wed Oct 28 2015