highaltitude.log.20151102

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[00:10] <M0XIN> eroomde: Congratulations? http://www.bbc.co.uk/news/business-34694935
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[01:15] <SpacenearUS> New vehicle on the map: 03f_chase - 12http://tracker.habhub.org/#!qm=All&q=f_chase
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[10:21] <SpacenearUS> New position from 03DL1NBR-12 after 0318 hours silence - 12http://tracker.habhub.org/#!qm=All&q=DL1NBR-12
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[11:41] <SpacenearUS> New vehicle on the map: 03R2AGQ-11 - 12http://tracker.habhub.org/#!qm=All&q=R2AGQ-11
[11:45] <dbrooke> .whereis DL1NBR-12
[11:45] <SpacenearUS> 03dbrooke: 03DL1NBR-12 is over 03United Kingdom 10(53.90616,-0.15017) at 036659 meters
[11:46] <craag> .track DL1NBR-12
[11:46] <SpacenearUS> 03craag: Here you go - 12http://tracker.habhub.org/#!qm=All&q=DL1NBR-12
[11:46] <dbrooke> noticed I heard it direct on APRS
[11:46] <jcoxon> pico?
[11:48] <craag> Guess so from the alt.
[11:48] <craag> can't find any more info on it
[11:49] <dbrooke> looks like it only started transmitting again over Lincs. so maybe has imprecise geofencing
[11:49] <jonsowman> imprecise
[11:49] <jonsowman> how polite
[11:51] <dbrooke> 8-) mind you, there's no track on aprs.fi over parts of Germany so maybe not
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[12:47] <SpacenearUS> New vehicle on the map: 03DL4MDW-12 - 12http://tracker.habhub.org/#!qm=All&q=DL4MDW-12
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[13:59] <SpacenearUS> New vehicle on the map: 03SSL1685 - 12http://tracker.habhub.org/#!qm=All&q=SSL1685
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[14:18] Action: cebrax slaps mattbrejza around a bit with a large fishbot
[14:19] <jonsowman> ...
[14:19] <cebrax> You got to create a blog!
[14:19] <jonsowman> um?
[14:20] <cebrax> I have found his GitHub page and want to know more about his projects. He is doing some cool stuff..
[14:22] <craag> writing a blog leaves less time for doing cool stuff.
[14:23] <adamgreig> eh
[14:23] <adamgreig> when i was young and more carefree with more free time apparently i did loads of cool different things and wrote them on my blog
[14:23] <adamgreig> then i went to uni and the blog immediately died as did most of my free time for projects :/
[14:23] <adamgreig> not sure the blog was to blame
[14:23] <jonsowman> lol
[14:23] <craag> heh
[14:24] <craag> but anyway cebrax, you could ask him!
[14:24] <jonsowman> he's usually around here
[14:24] <jonsowman> all day
[14:24] <jonsowman> surely he can't be doing actual work??
[14:24] <craag> slapping people with fishbots isn't the best way to extract information IME though
[14:25] <craag> lol no
[14:25] <cebrax> lol
[14:25] <eroomde> adamgreig: wait until job
[14:25] <eroomde> is job aligns with former hobby interests
[14:25] <eroomde> if*
[14:25] <eroomde> it consumes all
[14:25] <eroomde> and gets seasoned with commercial confidentiality
[14:26] <cebrax> I was searching about Si4012 and bumped into his GitHub... Then did a search and found the logs of this channel.
[14:26] <jonsowman> is that the 868 tx only one
[14:26] <eroomde> this is the right place for discussing the use and abuse of Si4XXX chips
[14:27] <jonsowman> he was actually using that for ukhasnet, so maybe join #ukhasnet too
[14:27] <jonsowman> not that you shouldn't talk about such things here, obviously
[14:27] <craag> here probably has a higher number of people who've worked with the si4xxx
[14:28] <jonsowman> true
[14:29] <cebrax> This RF things are all voodoo to me and there is not much information about it on the net.. So is this how you guys keep update yourselves, with IRC?
[14:29] <jonsowman> by getting stuck in and playing with stuff
[14:29] <eroomde> this is mostly a channel to support people building and flying high altitude balloons
[14:29] <cebrax> I really spent a lot time tried to dig info on Si4012, months ago and now I saw my bookmark and tried to dig again :)
[14:30] <adamgreig> eroomde: yea I dread it
[14:30] <adamgreig> but at the same time, eh, the cure would be worse than the disease ;)
[14:30] <eroomde> radio laws in the uk have necessitated a reasonable amount of thought about getting reliable telemetry with low link budgets over quite large distances, and people have used the si4xxx chips, among other things, for balloon telementry
[14:30] <adamgreig> having a blog and doing lots of small fun things is nice, but I'll trade for not having a blog and doing all the things I'm doing now instead
[14:30] <adamgreig> (evidently...)
[14:31] <eroomde> that said it might be nice to have *somewhere* just to write up and throw stuff when it's sort of done
[14:31] <eroomde> for posterity
[14:31] <eroomde> a blog might imply a level of update frequency that's unwarranted
[14:31] <cebrax> Yeah, I have started a blog a little time ago and couldn't keep up with it.. But I have an article that has made it to HackADay!
[14:31] <eroomde> but like, this chap http://www.aholme.co.uk/Projects.htm
[14:31] <eroomde> that seems ideal
[14:32] <jcoxon> got to admit that i probably look at my blog/documentation more then anyone else
[14:33] <jcoxon> which is not a bad thing
[14:33] <jcoxon> just that it helps remind me what i've done before
[14:33] <eroomde> a personal wiki :)
[14:33] <jcoxon> yeah but you share it
[14:33] <jcoxon> :-p
[14:33] <eroomde> i keep stuff written down across so many notebooks i think i should have a wiki really
[14:34] <eroomde> all the usual stuff like 'what's the brand of 0805 LEDs i normally use?' or how i configured a server or what the trick is for calculating noise in some device
[14:34] <eroomde> or whatever
[14:34] <adamgreig> get the ones with the arrow on the bottom instead of the stupid dot
[14:34] <jonsowman> +1
[14:35] <eroomde> except that
[14:35] <eroomde> on the recent batch i had, the arrow pointed to the anode
[14:35] <jonsowman> what
[14:35] <eroomde> which resulted in some hulk smash
[14:35] <adamgreig> lol
[14:35] <adamgreig> that's awful
[14:35] <eroomde> Wurth ones - you have been warned
[14:35] <eroomde> so now i just always fucking check
[14:35] <eroomde> no excuses
[14:35] <adamgreig> check the datasheet?
[14:36] <adamgreig> this is why i just order the same LEDs :p
[14:36] <eroomde> diode tester on my meter to the rescue
[14:36] <adamgreig> lol
[14:36] <eroomde> well i know what it is now for the OVS ones i used to use :)
[14:36] <eroomde> but they don't have an arrow, that's all
[14:36] <eroomde> jcoxon: yes, you share it :)
[14:41] <jcoxon> bbl
[14:45] Nick change: fl_0 -> fl_0|afk
[14:55] <kc2pit> Thank you, eroomde, for reminding me which brand of LEDs did that. I ran into that like two years ago and forgot which assholes did it.
[14:55] <kc2pit> At least I hope they're the only ones.
[14:56] <eroomde> who knows
[14:56] <eroomde> but yes
[14:56] <eroomde> gotta have your wits about you
[14:58] <daveake> best not to be misled
[15:01] <kc2pit> Can we do the slapping bit now?
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[15:27] Action: cebrax slaps kc2pit around a bit with a large fishbot
[15:27] <cebrax> lol sorry couldn't resist
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[15:34] <eroomde> cebrax: we tend to go a bit light on conventional irc memage here
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[15:35] <kc2pit> Heh. I actually haven't seen anyone slapped with a fish in about a decade.
[15:36] <eroomde> well exactly
[15:36] <BeaverOne> eroomde: http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/
[15:39] <eroomde> what about it?
[15:41] <BeaverOne> hoping to make use of it
[15:42] <BeaverOne> PID tuning seems it can be tedious
[15:42] <eroomde> not really
[15:42] <eroomde> and i wouldn't use it for flight control software either
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[15:42] <BeaverOne> oh
[15:42] <eroomde> basucally, i disagree with your premise a great deal and further thing you don't yet know enough about this topic to draw such conclusions
[15:42] <eroomde> think*
[15:43] <BeaverOne> i keep getting an unacceptable output in a certain circumstance
[15:43] <eroomde> i get that too if i have a really strong curry
[15:43] <BeaverOne> eroomde: you're Indian?
[15:43] <eroomde> no
[15:43] <eroomde> british
[15:43] <eroomde> curry is the national dish
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[15:47] <eroomde> but honestly, take it from me - if you're having problems getting PID to work on a system that should be conventionally PID controllable (i.e. not some great nonlinear monstrosity, but just a servo or something) and you're not sure why, you really shouldn't be flirting with self-tuning things
[15:48] <eroomde> that's just replacing one thing you don't really understand enough with another thing you don't really understand enough, and that's not the way to do engineering
[15:49] <Laurenceb> servos turn out to be non PIC controllable if they are trying to apply constant force to someones arm
[15:50] <Laurenceb> as I discovered some time ago
[15:50] <eroomde> i'm not convinced that that's generally true
[15:50] <Laurenceb> well it did work with PID
[15:50] <Laurenceb> but was an order of magnitude slower than an optimal controller
[15:50] <Laurenceb> anyway, a flying thing should be more well defined
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[15:52] <BeaverOne> "Linear-quadratic regulator" aka optimal control theory...
[15:52] <BeaverOne> hmm
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[15:54] <eroomde> BeaverOne: do you have a mathematical background?
[15:54] <eroomde> like a degree in maths/science/engineering
[15:54] <eroomde> or equiv
[15:54] <BeaverOne> eroomde: nope :(
[15:54] <BeaverOne> you?
[15:55] <eroomde> i can't really figure out how best to help (if you want some help) when you suggest things like LQR, if you understand what you are or if it's just as shiny buzzword
[15:55] <eroomde> yes i have a master's in control theory as it happens :)
[15:55] <BeaverOne> dang
[15:55] <eroomde> tho i don't profess much expertise in it given i've not used it much in anger professionally since graduating a few years ago
[15:56] <Ian_> Congrats by the way eroomde on the corporate success announced yesterday
[15:56] <BeaverOne> my first goal was to implement control on yaw/heading
[15:56] <eroomde> but saying LQR cos you can't figure out PID is a bit like wondering if you should learn rachmaninoff's 3rd pinao concerto cos you're getting too bogged down with chopsticks
[15:56] <eroomde> there isn't really a shortcut
[15:56] <BeaverOne> eroomde: you got a job?
[15:56] <eroomde> you should stick with getting a simple PID controller working and stable
[15:57] <eroomde> and play around with increasing the damping and proportional coefficientns and looking at the effect on stability and so on
[15:57] <eroomde> thanks Ian_
[15:57] <eroomde> we live in interesting times certainly
[15:57] <eroomde> BeaverOne: my project got a funding boost
[15:57] <eroomde> was in the news today
[15:57] <BeaverOne> well, its not that i cant figure it out, i just need to investigate the one behavior
[15:58] <russss> eroomde: congrats on that, sounds promising
[15:58] <eroomde> so describe this behaviour that is causing problems
[15:58] <BeaverOne> eroomde: may i see? congratulations
[15:58] <eroomde> what's the setup, what's the input, what's the observed output
[15:58] <BeaverOne> one moment
[15:58] Nick change: fl_0|afk -> fl_0
[15:58] <eroomde> BeaverOne: http://www.bbc.co.uk/news/business-34694935
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[16:00] <BeaverOne> all right, so i have a Setpoint of 1 Degrees (near North), Input value is the current Yaw/Heading
[16:00] Nick change: fl_0 -> fl_0|afk
[16:00] <Blafsen> Hi guys. For the dutch, german, belgium or even UK trackers: I just launched a test foil balloon containing just a gps and temp sensors. Launched it from southern NL.
[16:01] <Blafsen> DX: 434.275 MHz, RTTY, 50 baud, 300 Hz shift, 7 bits/char, 2 stop bits, no parity :)
[16:01] <BeaverOne> if i'm at or around 0 Degrees, it purposes an Output that is positive toward 1, and if i'm over 1 a little bit it purposes an Output of negative (gently) toward 1
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[16:02] <BeaverOne> what happens is if i'm near 0 and continue rotating negatively til 360 degrees, it outputs -360 hard, which makes sense really
[16:03] <BeaverOne> the problem is when i come back across to 0 toward 1 in rotation, it continues to propose a negative number which would tend toward 0 instead of 1
[16:03] <DL7AD> evening
[16:03] <eroomde> so your PID controller should be being fed an error right?
[16:04] <eroomde> difference between desired heading and actal heading
[16:04] <eroomde> e.g. 0.5 degrees
[16:04] <eroomde> or 2 degrees or whatever
[16:04] Nick change: jubatu_ -> bloated
[16:04] <eroomde> what you need to do to make that difference correct is write some logic to handle the 360degree wraparound
[16:05] <eroomde> so for example, you know that you can never have an error of >180 degrees
[16:06] <eroomde> because, say, 270 degrees error is actually just 90 degrees error the other way
[16:07] <eroomde> so if the error is >180 degrees, subtract 180 degrees and switch the sign
[16:07] <BeaverOne> yeah
[16:08] <BeaverOne> was in the budding stages of thinking that way
[16:11] <mattbrejza> or define a circle to contain 256 'degrees' and use a uint8
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[16:12] <adamgreig> or just work in radians
[16:13] <adamgreig> it doesn't help your problem at all but does make everything less obvious
[16:13] <eroomde> win
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[16:13] <adamgreig> "ah yes, wrapping around at 6.28318... hmm that number seems familiar"
[16:13] <eroomde> mattbrejza: that might be a little coarse
[16:13] <eroomde> dunno
[16:14] <mattbrejza> i entered this discussion pretty late
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[16:19] <BeaverOne> adamgreig: has that wraparound happened to you before?
[16:19] <eroomde> BeaverOne: it happens absolutely all the time in loads of applications
[16:20] <eroomde> you just have to do a bit of maths to transform the sensor data into something you can feed your controller
[16:20] <adamgreig> 6.28318 is 2*pi
[16:20] <adamgreig> which is one full circle if you go 0 to 2pi
[16:21] <eroomde> oh sorry *that* wraparound
[16:21] <adamgreig> (usually i'd go -pi to pi which makes for a more obvious problem but w/e)
[16:22] <BeaverOne> eroomde: i was considering ordering a book on Process Control, they're quite expensive
[16:22] <BeaverOne> adamgreig: thank you, that seems to line up with some of my research results
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[16:24] <adamgreig> using -pi to pi lines up with your research results?
[16:25] <BeaverOne> adamgreig: yes
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[16:27] <adamgreig> you could use 0 to 400, that's nice too
[16:27] <adamgreig> or I suppose 200 to -200
[16:28] <adamgreig> shame gradians don't fit into bytes really
[16:28] <SpacenearUS> New position from 03AIRCOR-51 after 033 days silence - 12http://tracker.habhub.org/#!qm=All&q=AIRCOR-51
[16:29] <ON5AV> Frequency of balloon SSL1685 ??
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[16:46] <Blafsen> SSL1685 = 434.275 MHz
[16:47] <Blafsen> 434.275 MHz, RTTY, 50 baud, 300 Hz shift, 7 bits/char, 2 stop bits, no parity
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[16:50] <ON5AV> Thank you
[16:52] <kc2pit> Heh. If pounds and feet and slugs and degrees Rankine haven't made your calculation silly enough yet, there are always gradians.
[16:54] <SpeedEvil> kc2pit: nits
[16:55] <kc2pit> If you want to get picky, sure.
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[16:59] <fsphil> possible aurora in northern areas tonight, clear skies permitting
[17:01] <eroomde> ha
[17:01] <eroomde> visibility 20m here
[17:02] <gonzo_nb> only about 10ft here. Unless I open the curtains
[17:02] <SIbot> In real units: 10 ft = 3.05 m
[17:02] <fsphil> good weather for lasers
[17:03] <fsphil> not so good for driving
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[17:04] <gonzo_nb> I have a 100mw green one that I first tried bu pointing it down the road at a parked car numverplate. Shat myself at the return and put it away again
[17:04] <BeaverOne> eroomde: heh, it's surprising, there's a lot of relevant results for the 360 to 0 wraparound issue
[17:04] <BeaverOne> eroomde: http://www.webr2.com/adjusting-for-compass-wrap-around-in-a-navigation-application/
[17:05] <eroomde> it's not surprising
[17:05] <eroomde> it's one of the first things you bump into with compass naviagtion
[17:05] <BeaverOne> oh,
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[17:06] <BeaverOne> eroomde: is your company going to make use of graphene at all?
[17:07] <eroomde> I don't know
[17:07] <eroomde> if it can usefully solve some problem, probably
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[17:08] <eroomde> i can't think of any applications within the engine, off the top of my head
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[17:26] <ON5AV> ?
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[17:26] <eroomde> meta
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[17:28] <Oddstr13> ooo, that's some nice predictions for SSL1685
[17:29] <Oddstr13> https://dl.dropboxusercontent.com/u/4306267/ShareX/2015/11/2015-11-02_18-29-14.png
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[17:37] <Oddstr13> also, where about would DL1NBR-12 be now?
[17:40] <Oddstr13> SA6BSS: what's up?
[17:40] Nick change: fl_0|afk -> fl_0
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[17:47] <SA6BSS> just home fronm work,
[17:48] <SA6BSS> geting the kids ready for bed, the litte one anyway
[17:48] <SA6BSS> you?
[17:48] <SA6BSS> ssl1685 comming your way
[17:50] <Oddstr13> been messing with ATmega328P
[17:50] <Oddstr13> I'm having it change speed between 1MHz, 2MHz, 4MHz and 8MHz, with serial still working :D
[17:50] <BeaverOne> eroomde: is there a technical term in the field for the 0/360 wraparound ?
[17:51] <Oddstr13> and, yea, trying to figure out dl-fldigi HAB mode now
[17:51] <eroomde> i don't know
[17:55] <SA6BSS> trajectory ssl1685v
[17:55] <SA6BSS> http://ready.arl.noaa.gov/hypubout/110834_trj001.gif
[17:57] <Oddstr13> yay, I'm on the map! :P
[17:57] <Oddstr13> now to actually find and connect the RTL-SDR
[17:58] <Oddstr13> SA6BSS: what about the DL1NBR-12?
[17:59] <SA6BSS> its a aprs, I think its tx rtty sub 3000m
[17:59] <Oddstr13> last seen 1h35m ago at 56.0615,0.219,6428
[17:59] <SA6BSS> iy
[17:59] <SA6BSS> its solar only
[17:59] <Oddstr13> aha
[18:00] <Oddstr13> I'm not gona be able to see that one then
[18:00] <SA6BSS> nop
[18:01] <SA6BSS> will probaly be over east SWE by the time it wakes up
[18:04] <Oddstr13> when will SSL1685 be over here you think?
[18:06] <Oddstr13> gotta love the animation on the map when a new receiver connects :P
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[18:09] <Oddstr13> oh, like 8 in the morning according to the telemetry graph & predictions
[18:09] <SA6BSS> yep, looks like it
[18:11] <Oddstr13> predictions havn't quite decided wether it's gona burst in an hour, or if it's gona land in china xD
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[18:20] <SA6BSS> habhub prderictor is made for up down fkights so ...
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[18:24] <Oddstr13> everything that goes up, comes down, I guess :P
[18:25] <SA6BSS> they do :)
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[18:41] <jcoxon> evening all
[18:41] <jcoxon> here is something interesting
[18:41] <jcoxon> from ofcom guidance for radio amateurs
[18:41] <eroomde> brush teeth every day
[18:41] <eroomde> deodorant considered good form - no need to be suspicious
[18:42] <jcoxon> We know that bursts of telemetry data can be sent from high altitude balloons, using
[18:42] <jcoxon> low-power equipment. If this equipment emits only low power levels, then its use
[18:42] <jcoxon> may be authorised by exemption regulations15. However, the prohibition of airborne
[18:42] <jcoxon> use, included in Clause 2(1)(c) of the Amateur Radio licence, prohibits the operation
[18:42] <jcoxon> of Amateur Radio equipment from high altitude balloons.
[18:42] <jcoxon> hehe
[18:42] <eroomde> link?
[18:42] <jcoxon> http://licensing.ofcom.org.uk/binaries/spectrum/amateur-radio/guidance-for-licensees/Amateur_Radio_Licence_Guidance_for_licensees.pdf
[18:42] <Lunar_Lander> hello
[18:43] <jcoxon> section 2.31
[18:44] <eroomde> gotcha
[18:44] Nick change: GeekShad1w -> GeekShadow
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[18:45] <eroomde> fairly explicit but no changes compared to what we understood the case to be, as far as i can see
[18:45] <jcoxon> yes
[18:45] <jcoxon> almost codifies it
[18:46] <eroomde> ir2030 only
[18:47] <jcoxon> yes
[18:47] <jcoxon> i like the fact that ofcom recognise us (consider that as a % pop we are quite small)
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[18:48] <eroomde> i guess there's so much overlap with ham stuff now that they take notice
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[19:03] <SpacenearUS> New vehicle on the map: 03f0gra_chase - 12http://tracker.habhub.org/#!qm=All&q=f0gra_chase
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[19:14] <pb0ahx> !flights
[19:14] <SpacenearUS> 03pb0ahx: There are no flights currently :(
[19:14] <pb0ahx> freq of SSL ????
[19:14] <Tjalling_PE1RQM> 434.2944
[19:15] <Tjalling_PE1RQM> Very distorted modulation
[19:15] malclocke (~malc@60-234-172-149.bitstream.orcon.net.nz) joined #highaltitude.
[19:16] <Tjalling_PE1RQM> Choose 240Hz shift and try one of the linespairs (RTTY 50baud, 7n2)
[19:17] <Tjalling_PE1RQM> @pb0ahx I hope you receive him
[19:18] <pb0ahx> ok
[19:20] <pb0ahx> hebbes
[19:20] <Tjalling_PE1RQM> There you go
[19:22] <SA6BSS> OBS its fm rtty
[19:22] <SA6BSS> reciver in fm mode and the rest a usual
[19:22] <Tjalling_PE1RQM> It had no carrier. This is double sideband
[19:22] <Tjalling_PE1RQM> I cannot decode him in FM
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[19:56] <DutchMillbt> Hi Herman wat is de freq. van SSL1685?
[19:58] <SA6BSS> try 434.2944
[19:58] <SA6BSS> it shoukd be on 434.275
[19:58] <SA6BSS> fm rtty 50 7n2
[20:03] <pb0ahx> DutchMillbt, 434.295
[20:03] <DutchMillbt> thx Herman .. but strange signal bit wired
[20:04] <pb0ahx> noordoost direction utrecht
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[20:05] <DutchMillbt> .. Herman wat zijn je settings in Fldigi?
[20:05] <DutchMillbt> .. kan er geen soep van maken op het moment
[20:06] <SA6BSS> flight dock says it tx in FM rtty so receiver in fm mode
[20:08] <DutchMillbt> .. lukt wel in ssb nu ;-)
[20:08] <pb0ahx> zie het
[20:09] <pb0ahx> ik sta ook in ssb
[20:09] <DutchMillbt> fm is zo 1980
[20:09] <pb0ahx> 50 bd 240 7n2
[20:10] <pb0ahx> en dan de 2 rechter carriers
[20:10] <DutchMillbt> .. ga het ook ffn proberen FM
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[20:19] <SM0ULC-Reb> evening!
[20:20] <DutchMillbt> Good evening ..
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[20:23] <DutchMillbt> Kan er niets meer van maken helaas ..
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[20:35] <pb0ahx> hier ook niets meer rotzooi modulatie
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[22:58] Nick change: fl_0 -> fl_0|afk
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[23:09] <Laurenceb_> quiet in here
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[23:26] <mbales_> indeed
[23:26] <mbales_> everyone is recovering from halloween i imagine
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[23:31] <Lunar_Lander> yea
[23:32] <mfa298> it looks like most of the activity was during the day, some people obviously don't have demanding jobs so get to irc more (or they're students)
[23:34] <gonzo_nb> irc is such low bandwidth, you can get away with it without affecting your work
[23:34] <gonzo_nb> That's my excuse
[23:37] <BeaverOne> http://www.amazon.com/Optimal-Control-Theory-Introduction-Engineering/dp/0486434842
[23:37] <mfa298> now that work has started to embrace slack (basicly irc in a web browser that everyone thinks is a great new invention) it's easier to get away with irc in the office (especially as slack has an irc gateway so it's in the same window as more useful stuff)
[23:37] <mfa298> now I just need stuff to break less often
[23:41] <gonzo_nb> I just keep a dos window up, that looks enough like irc to get away with it
[23:41] <gonzo_nb> even in a room full of programmers
[23:42] <gonzo_nb> (as they are all PC/windoze people, who have lost touch with the older systems)
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[23:53] <BeaverOne> anyone familiar with solving the HamiltonJacobiBellman equation ?
[23:55] <lz1dev> yeah, i do it to fall asleep
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[23:58] <mbales_> i dont do math with more than 2 letters involved
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[00:00] --- Tue Nov 3 2015