highaltitude.log.20140924

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[01:07] <mheld> anybody here use any really good gsm/gps modules?
[01:07] <mheld> we like the simcom968 in theory but apparently it's not FCC certified
[01:11] <mheld> also, why would it take 11 minutes to get a GPS fix with my ublox module
[01:17] <zyp> downloading ephemeris with poor coverage, I'd guess
[01:18] <zyp> IIRC a full ephemeris broadcast takes 30 seconds, so that's the best case time to get a fix from a cold start
[01:19] <zyp> and if you don't get everything in one cycle, it'd have to try over and over again for multiple cycles
[01:20] <zyp> the ephemeris is the diary of where the satellites are supposed to be at a given time, and it's impossible to calculate your position before you know where the satellites are
[01:20] <mheld> should I just wait 1 minute before polling?
[01:20] <mheld> instead of constantly polling uart and checking to see if it's a valid message?
[01:21] <zyp> nah, that's pointless
[01:23] <mheld> zyp: http://pastie.org/private/pg14fb9sviajbu5mrdyewq#264-280
[01:23] <mheld> (it's really gross)
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[06:42] <edmoore> mattbrejza, farnell now stocks this: https://www.bourns.com/data/global/pdfs/CDDFN2-T3.3B.pdf
[06:42] <pc1pcl>
[06:43] <edmoore> looks pretty good, especially the breakdown voltage
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[07:22] <fsphil> and another mars orbiter now arrived
[07:27] <x-f_> i was wondering - as there is almost no atmospheric drag, they'll stay up there forever?
[07:27] Nick change: x-f_ -> x-f
[07:28] <edmoore> yep
[07:28] <edmoore> drag will get them eventually
[07:29] <edmoore> but not for a while
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[07:44] <fsphil> marven's orbit will bring it into the martian atmosphere
[07:44] <fsphil> it's directly sampling it
[07:46] <fsphil> (reading up on it) dipping to 150km five times. that's still pretty high up
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[08:33] <amell> am i right in thinking a ublox from cold start always has to download ephemeris before locking? If i want to avoid that, i have to keep a backup battery connected?
[08:35] <mfa298> I believe that is correct. You can possibly also load the current data on manually but that may be more effort than it's worth for a HAB.
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[09:13] <amell> Looking for a jack socket that will make a connection when you _remove_ the plug - any idea what these are called on CPC site?
[09:18] <SpeedEvil> you mean a 3.5mm?
[09:18] <eroomde> almost all of them do, if you mean 3.5mm audio jacks
[09:18] <eroomde> they're double-throw
[09:19] <amell> the trouble is identifying which dont :)
[09:19] <eroomde> what is the application?
[09:19] <eroomde> is it separating electronics connectors for rockets or balloon payloads or similar?
[09:19] <amell> rocket - safety socket, pull before launch, starts altimeter, gps etc.
[09:19] <eroomde> right
[09:19] <eroomde> i've never been mega convinced by their rigidity
[09:20] <eroomde> i really want a very positive remove-to-make pin-pull switch
[09:20] <eroomde> for that kind of thing
[09:20] <eroomde> but i've not been able to find one
[09:20] <amell> me neither, been using wires and twisting them together, then taping over, but its getting annoying replacing the wires.
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[09:22] <amell> i think a socket will be ok as long as i can see orientation so i can make sure it stays firmly closed at max Gs
[09:24] <gonzo_> JulesBot: 3.5mm = 1/8"
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[10:21] <WillDWork> ss-10t microswitch would work well - i think i saw it in a perfectflite manual somewhere
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[10:27] <amell> WillDWork: thanks, but how does that option work mechanically?
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[10:29] <WillDWork> epoxy a tube, just found example (page13) here: http://perfectflite.com/StratoLogger%20manual.pdf
[10:30] <WillDWork> knew i'd seen it somewhere
[10:32] <amell> thaks thats interesting. just thinking how i would integrate such a switch into payload bay
[10:32] <eroomde> they get a prize for using latex
[10:37] <amell> strange using epoxy to attach brass tube. I;d just use a zip tie&
[10:37] <gonzo_> I would put a small frame over the microswitch, that you push a tab into, to press the switch. When removed the switch pings up. And the frame protects iot from beiong pressed by anything else
[10:37] <gonzo_> bit of bent thin ali strip would do
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[11:14] <Laurenceb> http://www.st.com/st-web-ui/static/active/en/resource/technical/document/data_brief/DM00116941.pdf
[11:14] Action: Laurenceb drools
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[11:45] <amell> arduino IDE is a pain in the arse if you are trying to debug I2c between two different board architectures.
[11:48] <amell> cant get it to work at all. can someone check code at: http://pastebin.com/8hxzp0qH ?
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[12:09] <eroomde> arduino ide is a pain in the arse
[12:15] <mattbrejza> ah thanks for the tvs eroomde
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[12:15] <eroomde> np
[12:15] <eroomde> it's birectional and low voltage
[12:15] <eroomde> which recommends it
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[12:16] <mattbrejza> is 13pF too high?
[12:17] <eroomde> yeah i wouldn't use it for rf, probably
[12:17] <eroomde> i have that in mind for things like uart debug connectors and so on
[12:17] <mattbrejza> oh right
[12:20] <mattbrejza> that m7 is pretty impressive
[12:20] <mattbrejza> gone to a AXI bus too
[12:20] <eroomde> http://uk.farnell.com/nxp/pesd5v0f1brsf/diode-esd-5v-bi-0-25pf-sod962/dp/2357119
[12:20] <eroomde> 250 fF
[12:20] <mattbrejza> ah nice
[12:20] <mattbrejza> that should do it
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[12:22] <eroomde> if you have an electrical ground isolated from shield/metal-case on a box, and you're worried about static build-up, another fine tip is to connect the pcb gnd to the case via a 10M (or so) resistor
[12:23] <eroomde> just to stop a PD building between gnd and shield, and which eventually spark over and hit the gate of a pyro mosfet or something else hilarious
[12:23] <mattbrejza> ah yea, after all thats what the esd wristbands are
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[12:23] <eroomde> zackly
[12:23] <mattbrejza> im just protecting the gps should anyone get too hands on around the antenna
[12:23] <eroomde> though that's more to stop your arm being a preferred path from live mains to earth
[12:24] <mattbrejza> seems wise
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[12:31] <amell> What HAB project involves live mains?
[12:32] <mattbrejza> super secret
[12:32] <eroomde> i think you haven't read the above properly
[12:32] <amell> parse error
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[12:44] <eroomde> that said there might be a number of valid reasons to generate fairly large ac voltages on a hab
[12:49] <mattbrejza> GM tubes being the main one i can think of
[12:49] <mattbrejza> oh ac
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[13:01] <mfa298> theoretically the end of the antenna (assuming 1/4 gp or dipole) are high voltage high frequncy ac.
[13:02] <mfa298> although theoretically also very low current
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[13:07] <eroomde> yep
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[16:41] <kf7fer> daveake: Thanks for the tip on the FC. Got one on the way for under $15.
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[16:50] <Ian_> Ditto, thanks.
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[17:59] <SpeedEvil> http://www.theonion.com/articles/nasa-administrator-resigns-after-leak-of-offensive,36992/
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[18:02] <kf7fer> "all but ruins the night sky for me"? Wow...
[18:03] <malgar> !whereis B-66
[18:03] <SpacenearUS> 03malgar: 03B-66 was over 03North Sea 10(57.9621,5.9182) at 0313472 meters about 036 days ago
[18:03] <malgar> !whereis B-64
[18:03] <SpacenearUS> 03malgar: 03B-64 was over 03Krasnoselkupsky District, Yamalo-Nenets Autonomous Okrug, Russia 10(65.36109,82.32599) at 0312061 meters about 032 days ago
[18:04] <arko> :( B-66
[18:04] <arko> i really wish it'd come back
[18:05] <SpeedEvil> 64 is looking to be at least a few days - especially if it misses japan
[18:08] <arko> yeah
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[19:07] <kf7fer> So if I'm looking for a SMT 33uF electrolytic cap it would appear that to get something bigger than 10v I need to go aluminum?
[19:08] <kf7fer> I've used Tantalum caps in the past but I don't see that digikey offers at 33uF in anything higher than 10v
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[19:11] <kf7fer> and while I'm talking to myself... what is "ripple current" when looking at cap specs?
[19:12] <mattbrejza> i would question why you wanted such a tant cap in the first place
[19:13] <kf7fer> well I was using a Pololu boost converter and in their notes they talk about "LC Voltage Spikes" and suggest a 33uF cap be put across VIN and GND to protect their board
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[19:13] <kf7fer> and I assume that since I'm allowing up to 7v input, I need a 14v+ cap
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[19:14] <kf7fer> I was looking for a tant because they are fairly small
[19:14] <kf7fer> a bad choice?
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[19:17] <kf7fer> but actually I found PCE5004CT-ND (an aluminum) and it's cheaper and about 4mm square, so that's not _too_ big
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[20:03] <cm13g09> mfa298: ping
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[20:15] <mfa298> cm13g09: pong
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[20:34] <cm13g09> mfa298: ping
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[20:58] <kf7fer> Does anyone know of a source of edge mount SMA connectors that will fit on a .6mm PCB? (since most seem to be for 1.6 boards)
[20:58] <kf7fer> err... .8mm (can't do math)
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[21:02] <Upu> try rfsupplier.com mail Kiki
[21:03] <Upu> paypal@rfsupplier.com
[21:03] <Upu> she's nice
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[21:48] <kf7fer> Thanks Upu. BTW thanks for the info on the MAX-7/flight mode issue; as a quick fix I just added a retry loop and I've got one board that always seems to fail the first time but then work
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[23:40] <amell> really struggling to get i2c working to debug this tracker. cant get any communication from it. wish i had a scope.
[23:41] <arko> get a logic an
[23:41] <amell> costs too much.
[23:45] <amell> i think i will have to switch to a software serial configuration so i can actually see whats going on.
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[00:00] --- Thu Sep 25 2014