highaltitude.log.20150915

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[03:24] <SpacenearUS> New vehicle on the map: 03yl3gbc_chase - 12http://tracker.habhub.org/#!qm=All&q=yl3gbc_chase
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[06:40] <SpacenearUS> New vehicle on the map: 03KZN-HAB1 - 12http://tracker.habhub.org/#!qm=All&q=KZN-HAB1
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[09:36] <SpacenearUS> New position from 03ER0UTM after 0316 hours silence - 12http://tracker.habhub.org/#!qm=All&q=ER0UTM
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[10:07] <MASAM> Hello! I just submitted a flight document, about a launch on next Saturday. Who should I ask for approval?
[10:08] <craag> MASAM: Hello! Post the flight doc in #habhub
[10:08] <craag> * flight doc id
[10:08] <Geoff-G8DHE-M> First make sure you do appear on the map by sending some telemetry in, then go over to the #habhub channel and post the Flight Doc ID number and ask for approval.
[10:09] <Geoff-G8DHE-M> snap
[10:09] <MASAM> Great! Thank you guys
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[10:16] <SpacenearUS> New vehicle on the map: 03MASAM-mm-CHASE_chase - 12http://tracker.habhub.org/#!qm=All&q=MASAM-mm-CHASE_chase
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[10:31] <SpacenearUS> New vehicle on the map: 03ER1OR_chase - 12http://tracker.habhub.org/#!qm=All&q=ER1OR_chase
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[10:54] <mattbrejza> hey craag , that pylon next to our launch site might be going http://www.bbc.co.uk/news/science-environment-34254392
[10:54] <craag> oh sweet
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[11:03] <gonzo__> there was somethink on the news this morn, about some plans to put in underground lines in places of special value
[11:03] <gonzo__> the new forrest was mentioned
[11:05] <gonzo__> (ok, dodn't see your link.... vnc lag)
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[11:06] <craag> It is a bit of an eyesore there
[11:06] <LazyLeopard> ;) Yep, that'd be the one. ;)
[11:06] <craag> As well as a hazard to Important Scientific Endeavours ;)
[11:06] <lz1dev> http://i.imgur.com/6N6t3oW.jpg
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[11:07] <mattbrejza> can you just put 400kV underground? or would it need converting to HVDC?
[11:07] <mattbrejza> or fine for short runs?
[11:10] <eroomde> it's possible to put them underground
[11:11] <eroomde> depending on how they're buried they can be uprated in power capacity too
[11:11] <murb> they want to remove them?
[11:11] <murb> they're part of the landscape by now.
[11:11] <murb> it'd be like removing old railway cuttings etc.
[11:12] <mattbrejza> http://www.aboutelectricity.co.uk/photogallery.php?photo_id=92 pretty large cable as you would expect too
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[11:14] <gonzo__> the 11kv underground lines are supprisingly small diam for the voltage rating
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[11:24] <Oddstr13> https://dl.dropboxusercontent.com/u/4306267/ShareX/2015/09/2015-09-15_13-21-58.png that is a lot of noise generated by my secondary monitor being on
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[11:56] <SpacenearUS> New vehicle on the map: 03yl3gbc_chase - 12http://tracker.habhub.org/#!qm=All&q=yl3gbc_chase
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[12:09] <Oddstr13> the biggest offender however, seems to be my wireless internet modem, with it's power over ethernet injector. https://dl.dropboxusercontent.com/u/4306267/ShareX/2015/09/2015-09-15_135822_0001934.png
[12:09] <eroomde> led lighting is shit too
[12:10] <adamgreig> and powerline ethernet
[12:10] <adamgreig> so gross
[12:10] <Oddstr13> I wendt over most of the lightning and turned it off, didn't see any changes on the ones I checked
[12:11] <Oddstr13> no powerline ethernet in this house
[12:11] <eroomde> good
[12:11] <Oddstr13> plenty of unshielded cat5e tho
[12:12] <Oddstr13> Looked like the ethernet cable with power injected going out to the modem was unshielded too
[12:12] <Oddstr13> is it possible to figure out which device is innside from the FCC ID sticker on the outside?
[12:13] <adamgreig> in theory yes..
[12:13] <adamgreig> my rust sdr library is working :')
[12:13] <russss> you can look it up on the FCC website and it'll have internal photos
[12:14] <adamgreig> 20Msps of raw ADC values turned into 44100Hz audio to portaudio (voice FM demod)
[12:14] <adamgreig> https://github.com/adamgreig/asfmrs/blob/use-sdr-rs/src/main.rs#L72-L85
[12:14] <adamgreig> need to think of a prettier syntax or a macro or something for chaining blocks
[12:16] <russss> that's quite neat
[12:16] <adamgreig> and it's type agnostic with compile time polymorphism for IQ and real valued fixed and floating point types
[12:16] <adamgreig> well, the FIR filter can do complex or real, the CIC only reals, the FM demod needs complex input, etf
[12:16] <adamgreig> the FIR filter is great, it's a polyphase arbitrary interpolater/decimator
[12:17] <adamgreig> but will crank through 80Msps on a single core with 64 taps
[12:17] <Oddstr13> "FCC ID: Z8H89FT0001"
[12:17] <adamgreig> and rust makes putting different blocks on different cores way easy
[12:18] <russss> Oddstr13: https://apps.fcc.gov/oetcf/eas/reports/GenericSearch.cfm
[12:18] <russss> Z8H in the first box, the rest goes in the second box
[12:19] <russss> consequently, https://apps.fcc.gov/eas/GetApplicationAttachment.html?id=1702433
[12:19] <russss> gah, sessions
[12:19] <russss> anyway if you click through you get internal photos
[12:20] <Oddstr13> 5.7-5.8 GHz, is that in the ISM band?
[12:20] <russss> I think so yes
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[12:32] <Oddstr13> time to get myelf a HackRF I guess
[12:41] <ike> is there any easy way to put SDR TV dongle away from any computers or LED lamps?
[12:42] <eroomde> yes
[12:42] <adamgreig> usb extension cable
[12:42] <ike> Maybe R pi with ethernet
[12:42] <eroomde> you unplug it from the computer
[12:42] <adamgreig> ed wins this one as usual
[12:42] <eroomde> and take it to somewhere that is not near a computer or an led lamp
[12:42] <daveake> `ha :)
[12:42] <ike> or maybe wireless router with USB port?
[12:42] <Oddstr13> I find a 5m USB extension cable to help quite a bit with noise from the computer
[12:42] <daveake> wireless router = computer
[12:43] <eroomde> put it in a metal box too
[12:43] <ike> I live in the house so I can put SDR dongle on my roof
[12:43] <Oddstr13> I really need some common mode chokes and shielding and stuff like that tho
[12:43] <ike> but to communicate I need wifi or ethernet lan
[12:44] <Oddstr13> optical fibre would obviosly be best!
[12:44] <ike> is it possible with OpenWRT to use SDR TV dongle?
[12:45] <ike> router with OpenWRT to use SDR TV dongle
[12:45] <russss> if you've just got one RTL-SDR then the RPi2 will comfortably run several using rtl_tcp
[12:45] <ike> I didn't know that there is such thing rtl_tcp
[12:45] <ike> 10x
[12:46] <ike> I'll google it
[12:46] <russss> it just streams the data over TCP - most SDR software can receive from it
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[12:48] <Oddstr13> I've never successfully ran the Pi with ethernet *and* anything connected to USB
[12:48] <russss> I've had it working with three RTL-SDRs actually on the RPI2
[12:48] <russss> any more saturates the ethernet
[12:49] <Oddstr13> while networking was working fine at the same time?
[12:49] <russss> yep
[12:49] <russss> one definitely works fine
[12:49] <Oddstr13> I guess they've improoved a lot on the Pi2 then
[12:49] <ike> So I'll need metal box, Rpi2, F/UTP cabble and good antenna
[12:49] <SpacenearUS> New vehicle on the map: 03G6SSN_chase - 12http://tracker.habhub.org/#!qm=All&q=G6SSN_chase
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[14:37] <SpacenearUS> New vehicle on the map: 03PYCON1 - 12http://tracker.habhub.org/#!qm=All&q=PYCON1
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[15:10] <SpacenearUS> New vehicle on the map: 03F-1 - 12http://tracker.habhub.org/#!qm=All&q=F-1
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[15:18] <Lunar_Lander> hello
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[15:34] <Lunar_Lander> hope you all are well :)
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[15:58] <SpacenearUS> New vehicle on the map: 036142627506_chase - 12http://tracker.habhub.org/#!qm=All&q=6142627506_chase
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[16:47] <eroomde> stilldavid: is that you in the wired article about battlebots?
[16:47] <stilldavid> yeah, the one with the one-line quote of an obscenity?
[16:47] <stilldavid> not my proudest moment :)
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[16:48] <eroomde> :)
[16:48] <eroomde> so the brazillians are literally a team from brazil?
[16:48] <eroomde> or is it more a state of mind of a certain kind of team?
[16:48] <stilldavid> yeah, they have a bunch of uni students that get massive sponsorships
[16:48] <stilldavid> but, yeah, actually from Brazil
[16:48] <eroomde> because i've seen that kind of sponsor-ridden shirt stuff with people like the wyachi crowd and others
[16:49] <eroomde> all a bit nascar
[16:49] <eroomde> oh righty
[16:49] <eroomde> makes more sense now
[16:49] <stilldavid> I love that line, "We need to talk about the Brazilians"
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[16:49] <SpacenearUS> New vehicle on the map: 031-614-357-2855_chase - 12http://tracker.habhub.org/#!qm=All&q=1-614-357-2855_chase
[16:49] <stilldavid> the breach in the arena was absolutely terrifying.
[16:49] <eroomde> /r/nocontext
[16:49] <eroomde> yes that's happened in my robot wars days
[16:49] <eroomde> not cool
[16:50] <stilldavid> the other builder on the team I was with just sort-of inherited an arena for up to 60lb 'bots
[16:50] <theRealSIbot> In real units: 60 lbs = 27.2 kg
[16:51] <stilldavid> cheeky bot.
[16:51] <lz1dev> why would you put your phone
[16:51] <lz1dev> silly americans
[16:51] <stilldavid> but it should be making its way to Colorado soonish.
[16:51] <eroomde> you want double-polycarb really
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[16:52] <stilldavid> yup. the ceiling of Dave's arena (in the article) has single, which is where it breached.
[16:53] <stilldavid> the walls are all double, I think it's 3/4" (1.9cm) polycarb
[16:56] <Upu> alot of energy going on in there
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[16:57] <eroomde> yep
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[16:59] <arjunnaha> has anyone had any experience cutting with extruded polystyrene foam?
[17:00] <eroomde> yes
[17:00] <eroomde> hot wire is nice if you can rig one up
[17:02] <arjunnaha> the foam is quite quick (about 5cm), so what I plan to do is to have 2 pieces of foam and create inserts between the two pieces and tape it all together
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[17:03] <arjunnaha> I just need to find a way to cut the inserts, my dt teacher said to use a chisel, but I think that will get very messy
[17:04] <eroomde> stilldavid: just watched some videos of touro
[17:04] <eroomde> i see what they mean about the shouting
[17:04] <Lunar_Lander> yea is Battlebots back for real now or just a one-off restart?
[17:04] <eroomde> arjunnaha: you could use a router
[17:04] <arjunnaha> I've got a dremel
[17:04] <arjunnaha> which tool would I use?
[17:04] <Lunar_Lander> and can people now install flamethrowers?
[17:04] <stilldavid> yeah, it's pretty crazy
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[17:05] <Lunar_Lander> because there was fire from one of these multibots
[17:05] <Upu> I still think Razor was aesthetically one of the nicest robots out there
[17:05] <Lunar_Lander> yea
[17:05] <Upu> Razer sorry
[17:06] <Lunar_Lander> I agree
[17:06] <ike> minigun is better than flamethrower
[17:06] <Lunar_Lander> yea I was surprised when I came across battlebots 2015 on youtube last week
[17:06] <stilldavid> eroomde: http://imgur.com/JtkrXkp
[17:06] <Lunar_Lander> warhead of the razer team was competing there too
[17:06] <stilldavid> that was their pit after a match
[17:09] <Lunar_Lander> so who of you competed on RW back in the days when it was on?
[17:10] <eroomde> i was on it once
[17:10] <eroomde> and did a few live events
[17:10] <Lunar_Lander> cool
[17:11] <eroomde> even organized a featherwight competition once when i was 16
[17:11] <stilldavid> I just have friends who do, but am good at things like charging batteries and running errands :)
[17:11] <stilldavid> and apparently know how to get a reporter to follow me around for an afternoon.
[17:12] <Lunar_Lander> :) nice
[17:12] <eroomde> i used to do antweights too
[17:12] <eroomde> i once came like 4th in an antweight word series with a fullbody spinner
[17:12] <Lunar_Lander> nice :)
[17:12] <eroomde> but that was... 15 years ago now
[17:12] <Lunar_Lander> yea
[17:12] <eroomde> which is a long time ago when you're 28
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[17:12] <eroomde> i'd love to build another antweight
[17:14] <Lunar_Lander> sounds good
[17:15] <eroomde> hydraulics would be really fun
[17:15] <Lunar_Lander> indeed, I think there was only one person who ever tried to make one
[17:15] <SpacenearUS> New vehicle on the map: 03Dl2fx-15_chase - 12http://tracker.habhub.org/#!qm=All&q=Dl2fx-15_chase
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[17:26] <eroomde> everyone: our own son, and JPL roboticist arko was just on BBC's 6 oclock news
[17:27] <eroomde> https://www.dropbox.com/s/49zo6lwg68qugm3/2015-09-15%2018.17.11.jpg?dl=0
[17:27] <Lunar_Lander> nice :)
[17:27] <eroomde> https://www.dropbox.com/s/vci5xwm3ype74rr/2015-09-15%2018.17.07.jpg?dl=0
[17:27] <eroomde> https://www.dropbox.com/s/5w4e3n8aq833644/2015-09-15%2018.16.19.jpg?dl=0
[17:28] <Lunar_Lander> nice, a walking bot?
[17:31] <Laurenceb> eroomde has been begging?
[17:33] <eroomde> ?
[17:33] <Laurenceb> top of the desk
[17:35] <Lunar_Lander> sleeping bag next to robot in pic 3?
[17:35] <eroomde> that's not me
[17:36] <Lunar_Lander> how big is the screen in pic 2?
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[17:41] <arko> Thanks eroomde :)
[17:45] <Lunar_Lander> arko, well doen :)
[17:45] <Lunar_Lander> done
[17:46] <arko> Lol I barely did anything
[17:46] <Lunar_Lander> :)
[17:46] <arko> I had just started when they filmed that
[17:46] <Lunar_Lander> ah
[17:46] <arko> :)
[17:46] <Lunar_Lander> what screens do the workstations have?
[17:46] <arko> Whatever you want to order
[17:46] <arko> :P
[17:47] <Lunar_Lander> oh :)
[17:49] <Lunar_Lander> sounds nice
[17:52] <arko> eroomde: you really nailed the timing :P
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[18:45] <Lunar_Lander> I was thinking about something today
[18:45] <Lunar_Lander> how to measure water drop density in a mist
[18:45] <Lunar_Lander> without having a professional particle sizer
[18:45] <Lunar_Lander> :)
[18:46] <SpeedEvil> scoop some mist into a tent.
[18:46] <SpeedEvil> Weigh tent after it's come down
[18:46] <Lunar_Lander> :)
[18:46] <Lunar_Lander> I was reading the reading paper on the LED flasher again, thus my thoughts
[18:46] <ike> with lasers?
[18:46] <Lunar_Lander> might be one idea
[18:46] <ike> with microwave oven?
[18:47] <Lunar_Lander> I first thought the most simple idea might be to photograph a grid on a back wall with a flash
[18:47] <Lunar_Lander> but that would mean the drops have to be big enough and also in focus
[18:48] <ike> spark gap?
[18:48] <Lunar_Lander> i.e. that the voltage for a spark changes?
[18:49] <Lunar_Lander> hmm
[18:49] <ike> or with of the gap
[18:49] <Lunar_Lander> ah ok
[18:49] <ike> *width
[18:49] <Lunar_Lander> interestign
[18:49] <ike> but voltage is more easy
[18:50] <ike> or maybe you can measure capacity
[18:50] <Lunar_Lander> yea
[18:50] <ike> there are many MCU with touch pins
[18:50] <ike> it's RC generator
[18:51] <ike> and this pins measure frequency
[18:51] <Lunar_Lander> ah
[18:51] <ike> http://processors.wiki.ti.com/index.php/MSP430_Low_Cost_PinOsc_Capacitive_Touch_Overview
[18:51] <Lunar_Lander> thanks :)
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[18:52] <Lunar_Lander> I'll brb and then I'll explain why I am looking for a method to do it
[18:53] <SpacenearUS> New vehicle on the map: 03ER1SC_chase - 12http://tracker.habhub.org/#!qm=All&q=ER1SC_chase
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[19:03] <RPF-JR> Hi just wondered if it's possible to set up a custom hourly for a location based on the LAT/LONG like http://predict.habhub.org/hourly/cambridge/# but for any site
[19:04] <Geoff-G8DHE> Yes post in #habhub the sysadmin's will ask for a password to us
[19:04] <Geoff-G8DHE> use
[19:05] <RPF-JR> thanks
[19:25] Nick change: fl_0|afk -> fl_0
[19:29] <SpacenearUS> New position from 03PS-54 after 033 days silence - 12http://tracker.habhub.org/#!qm=All&q=PS-54
[19:29] <SpacenearUS> New position from 03VK3YT-11 after 033 days silence - 12http://tracker.habhub.org/#!qm=All&q=VK3YT-11
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[19:40] <Lunar_Lander> the thing is, they wrote in their paper that they generated fog in a chamber by an ultrasonic nozzle and a fan drew this fog into a path inbetween the flashing LEDs and the photodiode
[19:40] <Lunar_Lander> so they measured the extinction of the LED signal by the fog
[19:40] <Lunar_Lander> and then their size analyzer measured the density of the droplets per ccm
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[19:53] <SpacenearUS> New vehicle on the map: 03KI4QCQ-11 - 12http://tracker.habhub.org/#!qm=All&q=KI4QCQ-11
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[20:59] <arjunnaha> What descent rate should I be aiming at for the parachute calculator at random aerospace?
[21:00] <Lunar_Lander> 5 m/s is a good maximum I think
[21:01] <Lunar_Lander> i..e try to be slower at best
[21:02] <arjunnaha> I entered in 1000, not realising it was kg and it was like 800m/s.
[21:02] <arjunnaha> Any logic in buying a particular size other than being below 5m/s?
[21:04] <Lunar_Lander> the size defines the descent velocity and is a function of payload mass
[21:05] <Lunar_Lander> so you select your chute for a given payload for a desired descent rate
[21:05] <SpacenearUS> New vehicle on the map: 03MASAM_01 - 12http://tracker.habhub.org/#!qm=All&q=MASAM_01
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[21:53] <Babs_> Evening everyone - I am having a mental blank. To draw a custom outline of a board in Eagle, its dimension layer 20, then using the wire tool? Do i have to do anything else specific with regard to widths etc? thanks
[21:55] <mattbrejza> width 0
[21:56] <mattbrejza> (and even then you dont have to set it to zero, but at then you dont have to worry whether the baord will be milled on the outside of that line or its middle)
[22:00] <Babs_> thanks mattbrejza
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[23:21] <cambazz> hello, any recomendations for a ground base station gps module? I have a ublox m8c with i2c outputs, and although I managed to read stream from i2c, and parse time, i need a better gps that is built for timing.
[23:22] <craag> You can configure any MAX-M8 into 'stationary mode' for timing
[23:22] <craag> and they have a PPS output
[23:22] <craag> What are you using the timing for?
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[23:25] <cambazz> craag: to measure the drift of external RTC
[23:26] <cambazz> craag: I have m8c, http://ava.upuaut.net/store/index.php?route=product/product&path=59_60&product_id=52 and it does not have the pps output
[23:26] <craag> Ah ok, that breakout board doesn't have it broken out
[23:28] <cambazz> anyway, is reading these messages are the only way to communicate with ublox max-m8
[23:28] <cambazz> or is there way I can read registers on it tru i2c?
[23:29] <cambazz> and i understand its got a RTC on it, I wonder if I can access them
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[23:30] <craag> You could carefully solder to the PPS pin on the module
[23:31] <craag> well you can access current time on either i2c or uart
[23:31] <craag> and the PPS will give you the second.0 mark
[23:32] <cambazz> yes, that would solve all my problems.
[23:34] <cambazz> also, I hardly found any documentation on i2c reading/writing. I made my own i2c reader, I just request some bytes then print them on serial. so this ublox contains a i2c but is the only thing it does spit things out like in serial?
[23:35] <cambazz> when you meant access current time tru i2c do you mean like reading a current time register on i2c, or getting the nmea stream and parsing the time messages?
[23:36] <craag> I haven't used the i2c, but as I understand it it basically does a crude UART->I2C conversion for the i2c port
[23:36] <craag> so there aren't nice registers
[23:36] <craag> you have to parse the messages either way
[23:37] <craag> you can use UBX commands to query the time explicitly though
[23:38] <craag> but that's not much advantage over parsing nmea and syncing on pps
[23:44] <cambazz> ok i get it. I have written some code that i can read the nmea string, but i somehow never get the GPGGA
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[23:45] <cambazz> how long should i wait for it usually?
[23:45] <craag> Ah it'll be in gps+glonass mode
[23:45] <craag> so you get a different string instead of GPGGA
[23:46] <craag> GNGGA I think?
[23:46] <craag> http://ava.upuaut.net/?p=768
[23:49] <cambazz> well, i get GNGGA but they are empty.
[23:50] <craag> Might indicate no fix
[23:50] <cambazz> yes, it probably did not fix yet. since I am only going to get time, can i get time without a fix?
[23:50] <cambazz> i read nmea supports this, but this glonass mode ? i hope it does not avoid it
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[23:51] <craag> It'll need to see some satellites to get a 'time fix'
[23:51] <cambazz> oh yes, it is sending time
[23:52] <craag> I don't think it can be certain that time is correct without a proper position fix
[23:52] <cambazz> GNGGA,235134.00,,,,,0,03,8.38,,,,,,*4A <- like this, this has time but no position right?
[23:52] <craag> yep
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[23:53] <craag> however fix mode there is '0' so it is uncertain of time also
[23:53] <craag> it'll do for testing, but to measure the rtc it'll need a position fix :)
[23:55] <cambazz> ok i see.
[23:56] <cambazz> what is "Horizontal dilution of position"
[23:56] <cambazz> and why does it vary in time
[23:56] <craag> That's how accurate it thinks it's idea of position is, in the horizontal plane
[23:56] <craag> lower is better
[23:56] <cambazz> in a previous https://learn.sparkfun.com/tutorials/alphanumeric-gps-wall-clock, they claim that position fix is not required for getting time. but i guess accuracy matters
[23:57] <craag> yep, without knowing where it is, it can't compensate for the delay and other rf effects from the satellites.
[23:59] <craag> so it might be good to within a second or so, but that's many orders of magnitude worse than it would be if it had a position fix.
[00:00] --- Wed Sep 16 2015