highaltitude.log.20140923

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[00:46] <SpacenearUS> New position from 03B-64 after 03a day silence - 12http://habhub.org/mt/?focus=B-64
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[00:56] <arko> yay
[00:56] <arko> the year LeoBodnar drew scribbles across the world
[01:02] <SpeedEvil> :)
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[03:05] <DL7AD> !hysplit B-64
[03:05] <SpacenearUS> 03DL7AD: HYSPLIT for 03B-64 - 12http://spacenear.us/tracker/hysplit_cache/140922-22_151817_B64.gif
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[05:24] <SpacenearUS> New vehicle on the map: 038306336596_chase - 12http://habhub.org/mt/?focus=8306336596_chase
[05:25] <SpacenearUS> New vehicle on the map: 037405088689_chase - 12http://habhub.org/mt/?focus=7405088689_chase
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[05:51] <jcoxon> B-64 is back
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[06:13] <Rebounder> wow, again
[06:24] <Maxell> \o/
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[06:47] <malgar> !flights
[06:47] <SpacenearUS> 03malgar: Current flights: 03B-64 434.500 Contestia 64/1000 10(3afe), 03B-66 434.500 Contestia 64/1000 10(705b), 03Peach-6 10(6cd9), 03PS-21 10.142Mhz OLIVIA 8/250 Enable RSID 10(b6ee)
[06:47] <malgar> !whereis B-64
[06:47] <SpacenearUS> 03malgar: 03B-64 was over 03Krasnoselkupsky District, Yamalo-Nenets Autonomous Okrug, Russia 10(65.36109,82.32599) at 0312061 meters about 035 hours ago
[06:47] <malgar> !whereis B-66
[06:47] <SpacenearUS> 03malgar: 03B-66 was over 03North Sea 10(57.9621,5.9182) at 0313472 meters about 035 days ago
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[07:01] <SpacenearUS> New position from 03VK3YT after 0319 hours silence - 12http://habhub.org/mt/?focus=VK3YT
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[07:47] <G8JNJ> !flights
[07:47] <SpacenearUS> 03G8JNJ: Current flights: 03B-64 434.500 Contestia 64/1000 10(3afe), 03B-66 434.500 Contestia 64/1000 10(705b), 03Peach-6 10(6cd9), 03PS-21 10.142Mhz OLIVIA 8/250 Enable RSID 10(b6ee)
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[08:12] <fsphil> oh nice VK3YT is back too
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[08:26] <SpacenearUS> New position from 03VK3YT_ after 03a day silence - 12http://habhub.org/mt/?focus=VK3YT_
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[08:35] Nick change: davo_ -> davo
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[08:56] <edmoore> get to work, fire up solidworks, crash! another happy day of cad ahead
[09:03] <chimpusmaximus> I got a 5hr 3d print on the go, so fingers crossed it goes smooth..
[09:12] <edmoore> i didn't think 3d printers did 'smooth'
[09:16] <edmoore> well not the extrudy head ones anyway
[09:18] <chimpusmaximus> hehe true
[09:18] <chimpusmaximus> Still shocked how well it works at time, considering i put it together.
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[09:21] <edmoore> yes you never really grow out of the surprise when someone you put togther works
[09:21] <edmoore> you sort of learn to control it
[09:21] <edmoore> and have a professional air
[09:21] <edmoore> but
[09:21] <edmoore> still makes you giddy
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[09:23] <chimpusmaximus> yeah people do look at you strange when you dance around the room when it works
[09:24] <chimpusmaximus> I'm still on cloud9 after my first HAB went with out hitch.
[09:24] <edmoore> i still do a little dance when an led blinks on a new board with a new chip
[09:24] <edmoore> you've climbed the mountain of toolchain
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[09:26] <Herman-PB0AHX> !flights
[09:26] <SpacenearUS> 03Herman-PB0AHX: Current flights: 03B-64 434.500 Contestia 64/1000 10(3afe), 03B-66 434.500 Contestia 64/1000 10(705b), 03Peach-6 10(6cd9), 03PS-21 10.142Mhz OLIVIA 8/250 Enable RSID 10(b6ee)
[09:27] <Herman-PB0AHX> !payload PIFALCON
[09:27] <SpacenearUS> 03Herman-PB0AHX: Can't find a flight doc matching your query
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[09:44] <chimpusmaximus> Goodies from ha supplies turned up.
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[09:59] <edmoore> chimpusmaximus, what did you order?
[10:02] <chimpusmaximus> Two RFM98W and a NTX2B-FA radio
[10:04] <chimpusmaximus> wanted to try some of the bits Dave has been doing with lora. Also as i did my first HAB with Pi in the Sky i wanted to spend a bit of time ding my own thing
[10:04] <daveake> good good (especially the latter :-) )
[10:04] <fsphil> nice
[10:04] <edmoore> +1 on the latter
[10:04] <edmoore> not that i have anything against the former
[10:05] <edmoore> but +1 on the latter
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[10:06] <chimpusmaximus> Pi in th sky just enabled us to get meet some original tight timescales. Also i dont think its to bad a price considering he components and reliability it gave.
[10:07] <edmoore> there's a whole longwinded backstory about whether or not to sell off-the-shelf trackers
[10:07] <edmoore> but yours is the perfect use-case
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[10:10] <chimpusmaximus> It gave SSDV as well out the box. Looking to try something with local schools for next year and can see it being perfect for that.
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[10:11] <chimpusmaximus> For myself i fancy less weight... Need all i can for camera equipment.
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[10:14] <mfa298> chimpusmaximus: I feel your pain with 3D printers, the stack of failed prints here is gradually rising.
[10:16] <mfa298> cm13g09: pong
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[10:18] <chimpusmaximus> mfa298: spent a fair bit of time last month ironing out issues and upgrading and replacing parts. New belts and pulleys helped a lot. Pulling the usb socket of pcb was not a good idea...
[10:19] <mfa298> we've gone through some of that here, with a couple of printers.
[10:20] <edmoore> we have some 3d printing woes
[10:20] <edmoore> but that's to do with inconel and is a whole nuther story
[10:22] <mfa298> they're great for prototyping stuff and the odd one off. Trying to print hundreds of mountings for parts is a different matter.
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[10:26] <chimpusmaximus> i'm glad i let a friend get one for 6 months before i took plunge. Very useful to understand what its capable of or not.
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[11:57] <Ian__> The Wiki on inconel suggest that it's a super material, but not one that sounds like it is likely to be easy to print. I guess it isn't rocket science though - it is :-) quel surprise
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[12:07] <Laurenceb> it laser sinters quite well
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[12:17] <edmoore> yes it's rocket related needless to say
[12:21] <SpeedEvil> You mean you're not printing an inconel iphone case? :)
[12:21] <SpeedEvil> Or raspberry-pi box.
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[12:22] <edmoore> maybe we could put a raspberry pi in it
[12:22] Action: SpeedEvil ponders.
[12:22] <edmoore> think of how many more retweets we'd get
[12:22] <fsphil> pigasm
[12:23] <mightymik> X-15 used inconel
[12:24] <edmoore> yep
[12:24] <edmoore> we use inconel :)
[12:24] <edmoore> quite a lot of it
[12:24] <edmoore> it's just not the easiest of badgers to work with
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[12:25] <edmoore> the X-15 is an interesting case study, I think I ended up concluding that it performed well despite its rocket engine rather than because of it
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[12:55] Action: Laurenceb wonders how well Lohan will perform
[12:55] <Laurenceb> im betting it will have insufficient thrust to lift off the launch rail
[12:55] <Laurenceb> what with it weighing a metric shiton
[12:58] <edmoore> i believe it's out of the hands of any ukhas involvement now
[13:00] Action: Laurenceb has a question about the SABRE engine
[13:00] <Laurenceb> it uses counter-rotating axial compressors right?
[13:01] <Laurenceb> how the heck do the shafts work for one of those ?!
[13:01] <Laurenceb> a shaft per blade disk?
[13:02] <edmoore> they work very well thank you
[13:02] <Laurenceb> heh
[13:02] <Laurenceb> maybe i should google
[13:03] <Laurenceb> http://www.google.com/patents/US20130223984
[13:03] <Laurenceb> lolz
[13:03] <SpeedEvil> http://www.airspacemag.com/flight-today/the-little-engine-that-couldnt-6865253/?no-ist=&page=5
[13:03] <Laurenceb> well thats one way
[13:03] <SpeedEvil> A three spool jet engine
[13:05] <edmoore> i think there's an old IAC paper by richard in the public domain
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[13:34] <cm13g09> mfa298: ping
[13:34] <mfa298> cm13g09: pong (lower rtt at last)
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[15:51] <SpacenearUS> New vehicle on the map: 03ATBGH - 12http://habhub.org/mt/?focus=ATBGH
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[17:21] <tjanos> Afternoon all!
[17:22] <tjanos> We had two pico BC02 and BC03. After launch they started to fly south-east. We were able to follow the throught the first 100 km, and after we lost.
[17:22] <tjanos> They had only one AA alkalin cell, we havenot hope, they come up somewhere. Please clear them from the map: t.janos, hg5apz, member of the team.
[17:24] <tjanos> some pictures are here: www.om3bc.com/BC02-BC03/
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[17:34] <DG0MG> tjanos, tnx for the pics :)
[17:36] <DG0MG> hoch much weight the payloads?
[17:36] <DG0MG> tjanos, how much weight had the payloads?
[17:37] <DG0MG> and how much boost do you have in the 36" ballon?
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[17:46] <tjanos> sry, I wasnot at the keyboard
[17:46] <tjanos> the weight of the payload is 30 gram
[17:46] <tjanos> it is a PIC based tracker with old style gGPS module
[17:47] <tjanos> (supported us by Techn Univ. Budapest
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[17:48] <tjanos> we applied 2 gram additional fre lift to approache the approx 6500 m
[17:48] <tjanos> free
[17:49] <Lunar_Lander> evening
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[18:10] <DG0MG> tjanos, now I was away from Keyb :)
[18:11] <DG0MG> ok, thank you for the info
[18:12] <DG0MG> we did start a pico-payload with a few Child-Ballons of latex:
[18:12] <DG0MG> http://dooce.de/dokuwiki/doku.php?id=projekte:utrak:start#testflug
[18:13] <DG0MG> and for the next try i have bougth foil balloons
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[18:50] <tjanos> DG0MG: Thank you for the links!
[18:50] <tjanos> sry, I went out, because my wife wanted to dinner...
[18:51] <tjanos> Your pico experiment was really nice.
[18:52] <tjanos> I made a look into the git repo of utrak, it is really nice, small tracker. Is it really 5 gram??
[18:53] <tjanos> And the TI MSP430 based design is new, interesting one!!
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[19:04] <DG0MG> yes, its really, but without battery :) one AA ist abt 25g, so we had 30g too
[19:04] <DL7AD_mobile> Evening
[19:05] <DG0MG> The Hardware is made by DK3SB, he found the MSP430 very good, for this purpose,
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[19:08] <DG0MG> lets see, next try. perhaps on the public holiday - the day of the Reunion :)
[19:08] <DL7AD_mobile> Isnt this a 16bit one?
[19:08] <DG0MG> keine ahnung :)
[19:09] <DL7AD_mobile> Thought it is yours
[19:09] <DG0MG> or: no idea :)
[19:09] <DL7AD_mobile> *your tracker
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[19:10] <DG0MG> no, not my tracker - only my ballons and my helium
[19:12] <DL7AD_mobile> Ah. Are your doing floaters or just ordinary latex balloons.
[19:12] <DL7AD_mobile> I mean that up and down ones
[19:13] <DG0MG> The latexballons was the first try. DK3SB has built an lightweight payload and ask, whether we can start this somewhere
[19:14] <DG0MG> these ballons are more than 10 years old - QUELLE isnt existing anymore :)
[19:14] <DL7AD_mobile> Ah
[19:14] <DL7AD_mobile> Ehm... wait a sec
[19:14] <DG0MG> we have filled 10 of them an let these fly
[19:15] <DG0MG> and from Saxony to Poland wasnt bad, we found
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[19:27] <Aerospark> Hey does the uBLOX MAX7 have a different command than uBLOX MAX6 for setting it to flight mode?
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[19:28] <Aerospark> my code that worked on my previous board doesn't work anymore
[19:28] <Aerospark> and i upgraded to the MAX7
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[19:31] <Upu> Code is the same Aerospark from MAX6 to MAX7
[19:31] <Aerospark> damnit.. probably messed up the pcb -.-
[19:31] <Upu> however I have noticed MAX7 is a little more sensitive about the response
[19:31] <Aerospark> any connection changes?
[19:31] <Upu> what code are you using ?
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[19:32] <Aerospark> https://gist.github.com/Sanghera/541e554873d600604f2b
[19:33] <Aerospark> it's similar to that
[19:33] <Upu> what manner of alchemy is that
[19:33] <Aerospark> python lol
[19:34] <Upu> heh
[19:34] <Upu> ok you check for a valid response
[19:34] <Upu> just ringing a bell
[19:34] <Upu> it will come to me
[19:34] <Aerospark> yeah, worked for max6 no problem
[19:35] <Aerospark> fails a couple times at first but then it succeeds
[19:35] <Upu> oh got ity
[19:35] <Upu> I remember now
[19:36] <Upu> https://github.com/HABduino/HABduino/blob/master/Software/habduino/habduino.ino#L446-L468
[19:36] <Upu> turn off all the NMEA strings
[19:36] <Upu> set it
[19:36] <Upu> and then turn them back on or don't bother if you're using UBX
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[19:37] <Aerospark> that code looks like it does the same thing
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[19:38] <Aerospark> what's the difference?
[19:38] <Upu> I turn the NMEA strings off and confirm it
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[19:39] <Upu> thats the key istr
[19:40] <Aerospark> ah right, it's a different command
[19:40] <Aerospark> thanks, i'll give it a shot
[19:41] <Upu> yeah took me a week of pulling my hair out that one
[19:41] <Upu> sussed with with a logic analyser
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[19:43] <Aerospark> lmao
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[19:45] <kf7fer> Upu: So I've noticed the newer boards I've done with the MAX-7 sometimes fail setting flight mode. But if I power the board off and back on, it works. Is this possibly the same issue?
[19:46] <kf7fer> I switch to flight mode _before_ I disable GGL, GSA, GSV, VTG
[19:47] <mattbrejza> does it repeatily fail if you periodically send it flight mode packets?
[19:48] <Upu> try disable the NMEA before setting
[19:48] <kf7fer> Don't know. I only try once in setup
[19:48] <Upu> and check it's got it
[19:48] <Upu> and yes this is the issue I was seeing
[19:48] <kf7fer> all of the sentences?
[19:49] <kf7fer> I do check the return from trying to switch to flight mode since I consider that an abort condition if it's not set
[19:49] <Upu> yup see that code I posted
[19:49] <Upu> doesn't all from one command
[19:49] <Upu> does even
[19:49] <mattbrejza> if you resend the command every sentence then it wont matter if it fails occasionally
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[19:49] <mattbrejza> no harm in repeating settings
[19:49] <kf7fer> hmmm... looking at the code now. Ok, I'll try switching the order I'm doing this
[19:50] <kf7fer> mattbrejza: I suppose not, but I wouldn't want to launch if I wasn't in flight mode
[19:50] <Upu> Issue never occurred on the MAX6's
[19:50] <mattbrejza> well yea you can read the flight mode register and indicate as such
[19:51] <mattbrejza> but normally a failure in communciation would be a very rare thing rather than a systemtaic issue
[19:52] <kf7fer> I never saw this before with the 6's (and I've only done 2-3 boards with a 7). And well I was just trying to keep things simple - and it was a "fail safe" to make sure I could talk to the GPS.
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[19:52] <kf7fer> I suppose I could do the same thing just checking the returns from switching off the NMEA sentences
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[19:53] <kf7fer> and really I was going to change the code to only switch to flight mode after the altitude gets... well higher
[19:53] <Upu> well mine does that
[19:53] <Upu> switches from pedestrian to flight
[19:54] <kf7fer> based on the current altitude?
[19:54] <Upu> yep
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[19:54] <Upu> https://github.com/HABduino/HABduino/blob/master/Software/habduino/habduino.ino#L658-L674
[19:54] <kf7fer> it's a good idea. I should have known that someone else did it before me ;-)
[19:54] <kf7fer> wow... I like the ability to specify lines in the URL. That's way cool. Didn't know you could do that
[19:55] <Upu> really helpful
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[19:55] <kf7fer> sure is... no more sending code fragments
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[19:56] <kf7fer> So anybody see these guys: http://www.highaltitudescience.com/collections/kits/products/eagle-pro-near-space-kit
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[19:56] <kf7fer> only 1.5lbs + camera weight to near space!
[19:57] <kf7fer> I did kinda like their whole "flight frame" idea. Not sure I care if the payload lands right-side up or not tho
[19:57] <kf7fer> And a 350g balloon can really haul nearly 2lbs to 95k feet?
[19:57] <Aerospark> Yeah I wonder how that actually helps it land right side up, if the thing starts spinning it won't be much help
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[19:57] <kf7fer> (what, no SIbot?)
[19:58] <Upu> Well when you're relying on SPOT you need to make sure it lands the right way up
[19:58] <kf7fer> I think they are hoping that gravity will help. Heavy side down and all
[19:59] <Aerospark> yeah we used SPOT for a few launches, if it lands upside down your screwed
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[19:59] <edmoore> annoyingly heavy side is down with physics
[20:00] <edmoore> but heavyside step function goes from down to up at t=0
[20:00] <edmoore> linear systems peeps didn't think that through
[20:01] <Aerospark> hey Upu, on your board did you connect MAX7 RESET pin to VCC? I noticed in their document they made a change from MAX6 to 7
[20:01] <edmoore> this and other bullshit available in my new book, 'edmoore needs a glass of wine in his beef stew so drinks the remainder of the bottle' available from all good midweek drinking bookshops
[20:01] <kf7fer> Aerospark: You mean N_RESET?
[20:01] <Aerospark> yeah
[20:01] <kf7fer> No change
[20:01] <Aerospark> Pin 9
[20:02] <kf7fer> The MAX-6 docs only say not to pull it low
[20:02] <Upu> I did leave it connected to VCC yes
[20:02] <mattbrejza> you dont need to connect it since max 7, just read the integration manaual, theres a nice table
[20:02] <kf7fer> I pull it high because it makes it easy to route the decoupling cap... I think I got that idea from Upu
[20:02] <Aerospark> http://www.u-blox.com/images/downloads/Product_Docs/MAX7-NEO7_HardwareIntegrationManual_(UBX-13003704).pdf
[20:02] <Aerospark> page 18
[20:02] <Upu> not connecting it is correct
[20:02] <Upu> but if you connect it works
[20:02] <Aerospark> and they pull VBCKP high as well
[20:03] <kf7fer> they didn't always do that?
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[20:04] <mattbrejza> may i also draw your attention to page 42, the ESD protection section
[20:04] <mattbrejza> its more important than the connect/dont connect N_RESET discussion :P
[20:07] <Upu> haha
[20:07] <edmoore> yeah esd sucks
[20:08] <edmoore> many reset circuits on ICs have internal pullups so connecting them externally is not necessary but doesn;t hurt anyone
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[20:08] <mattbrejza> using a low capcitance diode made for gps seems better somehow than the inductor one
[20:08] <edmoore> unless the reset input schmidt trigger has some massive bias current but that's just pathological
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[20:09] <edmoore> bottle of wine tip #2
[20:09] <edmoore> schottkey diodes have much larger reverse leagake currents than normal diodes
[20:10] <mattbrejza> ill ask you tomorrow lol
[20:10] <mattbrejza> or just put the footprint on the board and work it out later
[20:10] <edmoore> so when doing something like, to pick an example at random, adding battery polarity reversal protection to a battery voltage measurement to an adc, via a high impedance potential divider, a schotkey might leake enough current to upset the PD values significantly
[20:11] <edmoore> yeah i'd use a diode mattbrejza
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[20:11] <edmoore> one can get transiet voltage supressors too which break down v quixkly
[20:11] <kf7fer> Aerospark: Regarding V_BCKP... I always just tied that to VCC (but I did turn off power to the MAX-6 so maybe that was ok?)
[20:11] <edmoore> tho given there's only like femotovolts on the rf in a normal fast signal diode will be just fine, i'm sure
[20:12] <mattbrejza> oh when i said diode i ment TVS
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[20:12] <edmoore> my point still stands
[20:12] <mattbrejza> yea
[20:12] <edmoore> i'm on the cider now too
[20:12] <edmoore> needed 200ms for some braised red cabbage
[20:12] <edmoore> remaining 300ml for some braised red edmoore
[20:12] <edmoore> ml*
[20:13] <mattbrejza> lol, sounds tasty though
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[20:14] <Upu> lol
[20:15] <edmoore> yep!
[20:15] <edmoore> i'm reciproacting dinner tomorrow for some spanish friends
[20:15] <edmoore> they nuked me with delicious ham and tapas and sherry a couple of weeks ago
[20:15] <edmoore> i'm reciprocated by going full english on them
[20:15] <edmoore> cottage pie, braised red cabbage, green beans
[20:16] <edmoore> tis after the autumn equinoc afterall
[20:16] <edmoore> but with added french because i am half
[20:16] <edmoore> so gougere and fizz, and a lemon tart for pud
[20:16] <edmoore> gougere is a burgundian nibble which is orgasmatron, i recommend
[20:16] <edmoore> sorry, carry on talking about balloons n that
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[20:18] <edmoore> hope i didn't upset aerospark
[20:18] <edmoore> io remember in my gap year, the company we worked for got bought by some americans
[20:18] <edmoore> they came over and took us out for dinner one evening
[20:19] <edmoore> they bought like 2 bottles of wine for the table of ten
[20:19] <edmoore> which is clearly at least 8 short of what you need
[20:19] <edmoore> so we kept ordering more
[20:19] <edmoore> about 1 week later, after they'd left, there came a decree via email that there was to be no more drinking on company time
[20:19] <edmoore> turns out they were mormon
[20:20] <edmoore> sucks to be them huh
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[20:21] <Laurenceb__> hi eroomde
[20:21] <Laurenceb__> nice monologue
[20:21] <Laurenceb__> :D
[20:21] <edmoore> oh he's back
[20:21] <edmoore> no offence caused
[20:21] <Laurenceb__> heh
[20:21] <edmoore> i think you still win the prize for monologue coefficient, Laurenceb
[20:22] <Laurenceb__> there is indeed such a coefficient...
[20:22] <aadamson> you should see him on the stm32 channel :)
[20:22] <edmoore> anything i do nowadays is merest noise compared to the half a decade of hard work you put in between 2006 and 2011
[20:22] <Laurenceb__> psig stats
[20:22] <Laurenceb__> nowadays i have a proper job
[20:22] <edmoore> yeah same
[20:22] <edmoore> annoying how life works
[20:22] <edmoore> let's go back to arguing about how to arrange a state vector in a kalman filter
[20:23] <edmoore> no other cares in the world
[20:23] <edmoore> like mortgages
[20:23] <edmoore> of company funding
[20:23] <edmoore> or MOT needed new tyres, pads and discs
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[20:25] <Laurenceb__> my thesis should be online in a week or two
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[20:25] <Laurenceb__> if all goes well at UCL
[20:26] <Laurenceb__> viva coming up
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[20:29] <edmoore> is it with UCL?
[20:29] <Laurenceb__> viva is at UCL, PhD at Nottingham
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[20:41] <amell> tjanos: what envelope is that? looks bit big for qualatex?
[20:42] <amell> uh. just noticed my screen wasnt refreshing. sorry about that
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[21:00] <amell> Today, I received some 433mhz antenna in the post from China. Highly suspicious as to whether they actually work
[21:00] <amell> was expecting quarter wave, but what was delivered is only 55mm long.
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[21:02] <edmoore> everything looks like a quarter wave if you squint enough and load it up
[21:04] <myself> why, yes, this is my resonant domestic plumbing and j-pole.
[21:05] <myself> (ivo shandor, architect)
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[21:13] <daveake> the aerial bit is probably less than half of that 55mm
[21:13] <amell> is there an easy way to test it - without tx/rx or opening it up.
[21:14] <myself> bug your dentist into x-raying it for you?
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[21:14] <amell> not a bad idea
[21:14] <amell> but will likely attract NHS x-ray charge
[21:14] <daveake> cost of x-ray >> cost of aerial that works
[21:15] <amell> Uk sourced aerials are ridiculous prices on ebay. 8 quid for a quarter wave, wtf
[21:15] <myself> hm, build one?
[21:15] <daveake> that
[21:15] <daveake> The LPRS ones are cheap enough and do work
[21:16] <myself> Just get a lead with whatever connector on both ends, chop it in half, now you have two pigtails
[21:16] <amell> LPRS?
[21:16] <daveake> LPRS
[21:16] <myself> LPRS!
[21:17] <amell> Ta. found them
[21:17] <daveake> A little frequency counter / signal strength meter will give you a good idea how well one aerial compares with another
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[21:44] <kf7fer> daveake: I don't suppose you have any recommendations?
[21:44] <kf7fer> for the frequency counter / signal strength meter I mean
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[22:28] <daveake> Mine is one of these http://www.ebay.co.uk/itm/Digital-LCD-Signal-Frequency-Counter-Tester-for-Two-Way-Radio-Transceiver-/181457126894?pt=UK_Mobile_Phones_Communication_Radio_Meters&hash=item2a3fb005ee
[22:28] <daveake> Just search for "GY560" you can probably get it for less
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[22:29] <amell> how does it know what frequency to look for?
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[22:31] <amell> i mean if i have multiple sources of frequency, does it lock onto the strongest?
[22:33] <SpeedEvil> Basically, it only works very well for single large amplitue
[22:33] <SpeedEvil> de
[22:33] <SpeedEvil> if you have multiple frequencies - it will get confused
[22:34] <daveake> or indeed a modulation scheme that changes frequency a lot
[22:34] <SpeedEvil> That, it may simpy give you teh average
[22:34] <daveake> slow lora causes the display to change quicker than it can be read :/
[22:34] <daveake> fast lora would be ok
[22:35] <daveake> rtty is fine
[22:35] <Ian_> It's effectively a very simple near field receiver
[22:35] <amell> and if i hold it to my iphone, it will tell me what gsm freq is being used?
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[22:37] <Ian_> It will probably show you :)
[22:40] <Ian_> Like a small child, best seen but not heard
[22:42] <SpeedEvil> GSM does not transmit close to continuousy
[22:42] <SpeedEvil> for many settings, it may show wildly misleading figures
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[00:00] --- Wed Sep 24 2014