highaltitude.log.20140512

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[00:13] <Reb-SM3ULC> aadamson: i'm up :)
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[00:18] <aadamson> Reb - tell me what you think the device current is for this part...
[00:18] <aadamson> http://www.ti.com/lit/ds/symlink/tps62290.pdf
[00:19] <aadamson> page 3 the quiescent current when the device is active
[00:19] <aadamson> output is approx 2ma and mode is ground
[00:19] <aadamson> I think from that it means that it's going to be about 4ma (3.8) which is 2x what it's providing unfortunately
[00:19] <aadamson> I'm at 2v btw ouput
[00:20] <aadamson> I think I just found a major flaw in my pv/lipo design - that part
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[00:27] <Reb-SM3ULC> aadamson: mm, no idea, sri
[00:28] <aadamson> he he ... no problem, thanks for looking
[00:28] <Reb-SM3ULC> <<300 ma ?
[00:29] <Reb-SM3ULC> since 300 ma at 2.3 v, right?
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[00:32] <aadamson> I'm just trying to figure out how much current I should see *leave* the battery when the output demands is about 3mA (input voltage is 3.7, output is 2.0v)
[00:36] <aadamson> I think I just answered my own question.
[00:36] <aadamson> discharged lipo at 3.6v, plug into the buck controller, with NO load and get 0.000 amp of current from the battery
[00:37] <aadamson> plug in a fully charged - 4.1v lipo and I see .005 (5ma) of current leave the battery
[00:37] <aadamson> add a resistor on the output of the buck controller, plug in the discharged battery and guess what...
[00:37] <aadamson> .005 (5ma) of current leave the batteryr
[00:38] <aadamson> *I don't like this controller* it's low current usage is not very good at all
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[08:10] <nats`> hey boyz !
[08:11] <nats`> there is some sort or achive for the Spacenear.us tracker ?
[08:11] <nats`> I would like to see some flight profil
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[08:16] <fsphil> not on spacnear, but you can grab older flight data from http://habitat.habhub.org/ept/
[08:17] <fsphil> load it into google earth or maps
[08:23] <nats`> y :)
[08:23] <nats`> oky
[08:23] <nats`> thx
[08:23] <DL1SGP> salut nats, hi fsphil, good morning all
[08:24] <fsphil> morn
[08:24] <fsphil> monday
[08:24] <nats`> mornin DL1SGP :)
[08:24] <fsphil> lets get this over with :)
[08:24] <nats`> that rocks fsphil :)
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[09:40] <DL7AD> morning
[09:43] Last message repeated 1 time(s).
[09:43] <DL1SGP> hi sven
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[09:55] <DL1SGP> Good Morning LeoBodnar
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[11:16] <aadamson> LeoBodnar, what buck controller do you use with your solar setup?
[11:18] <aadamson> ping upu - see pm
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[13:13] <aadamson> Laurenceb__, you around?
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[14:20] <Laurenceb__> aadamson: I am now
[14:26] <aadamson> hehe... thanks
[14:26] <aadamson> well, my new challenge.
[14:27] <aadamson> the tps62290 buck controller on my solar setup is wicked bad at low current
[14:27] <aadamson> e.g. it's quiescent current it 3.8mA :(
[14:27] <aadamson> so when I have a load of 2-3ma, it take almost 7
[14:27] <Laurenceb__> oops
[14:27] <aadamson> you done anything with buck controllers
[14:27] <Laurenceb__> not much
[14:28] <aadamson> ok, I'll ping LeoBodnar when he's done with work, not sure if he uses one or an LDO
[14:28] <Laurenceb__> ive used a few linear tech thingies as sepic
[14:28] <aadamson> same with UPU
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[14:28] <aadamson> yeah, linear has some nice ones that are around 45uA
[14:28] <aadamson> *that* I could live with
[14:28] <nats`> I'm surprised aadamson
[14:28] <nats`> typical is given for 15uA
[14:29] <nats`> and 90% efficiency at 1mA
[14:29] <aadamson> but to be in sleep at 2ma (whole board) and have to use 7
[14:29] <aadamson> nats`, happy for someone to check me.
[14:29] <aadamson> http://www.ti.com/lit/ds/symlink/tps62290.pdf
[14:29] <aadamson> page 3
[14:29] <nats`> how do you measure your current ?
[14:29] <aadamson> mode = ground
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[14:29] <nats`> uhhmm yep with no load it's a weird behavior
[14:29] <aadamson> I'm looking at load current with a meter and battery current on the in side with a meter
[14:30] <nats`> looks like it doesn't have any adaptative frequency
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[14:30] <aadamson> nope, it does something strange with voltage is all
[14:30] <aadamson> but it's a problem
[14:30] <aadamson> to only need 2 and yet have to give 7 is a RPITA
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[14:31] <nats`> even in power save mode ?
[14:31] <nats`> check page 6
[14:31] <aadamson> yes, mode = ground
[14:31] <aadamson> yea I know, it's a very strange curve
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[14:32] <aadamson> e.g. at 3ma of load, it's 7ma of current from the battery
[14:32] <nats`> there must be a problem basically you're saying you have less than 50% efficiency when émA load is present
[14:32] <nats`> 2mA
[14:32] <aadamson> at 50ma of load it's 35ma of current from the battery
[14:33] <aadamson> I verified this also by taking the controller with zero load, and zero current from the battery and then adding a very small resistor on the load side
[14:33] <aadamson> the current jumps to 5ma
[14:33] <nats`> you have a scope ?
[14:33] <aadamson> take away the load and it goes back to zero
[14:33] <aadamson> yes
[14:33] <nats`> can you check the voltage output when on really low load
[14:33] <nats`> like your 3mA
[14:33] <aadamson> I won't get a chance to do that for a while, but what should I look for/
[14:33] <aadamson> ?
[14:34] <nats`> I have some idea
[14:34] <nats`> first what are the resistor you choosed for the feedback
[14:34] <nats`> second what did you take as output and input capacitor
[14:34] <aadamson> (I've actually got to run out and do real work for a change)... hang on let me check
[14:34] <nats`> especially their esr
[14:34] <aadamson> https://dl.dropboxusercontent.com/u/6730484/Boost-Solar%20Voltage.pdf
[14:34] <aadamson> easier than that :)
[14:35] <nats`> you 10uF is chemical ?
[14:35] <aadamson> C7 and C8 are x7r ceramics
[14:35] <aadamson> I wanted low esr
[14:35] <aadamson> so I used ceramics
[14:35] <nats`> oky (maybe not related but next time put more than one, the more in paralell the best it is)
[14:36] <aadamson> yes, understood
[14:36] <nats`> and your battery voltage is high enough ?
[14:36] <aadamson> battery doesn't matter, at 3.6v same as 4.1
[14:36] <aadamson> same effect on quiescent current
[14:36] <aadamson> < 1ma load = 5ma pull from the battery :(
[14:37] <nats`> you didn't answer I think how do you measure that ?
[14:37] <nats`> with a multimeter ?
[14:37] <aadamson> yes
[14:37] <nats`> on mA mode ?
[14:37] <aadamson> is
[14:37] <aadamson> yes
[14:37] <nats`> oky your multimeter can be the problem
[14:37] <nats`> on mA mode it's often a resistor of 2 to 10ohme
[14:37] <nats`> ohm
[14:37] <nats`> can you measure the resistor of your multimeter with an other one
[14:38] <nats`> when you are in mA current mode
[14:39] <aadamson> .2ohms?
[14:39] <nats`> in mA mode ?!
[14:39] <nats`> that seems unlikely unless it's a really good micro amperemeter
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[14:40] <aadamson> it's fluke stuff and yes, in mA mode it's .2-.3 ohms
[14:40] <nats`> seeing the datasheet and if no error on other part of the schematic I think you have a problem with measuring such low current
[14:40] <aadamson> fluke measuring fluke
[14:40] <nats`> reference ?
[14:40] <aadamson> fluke 117
[14:41] <aadamson> what lead me to this was that I noticed that with NO load on the controller, that when solar went dark, the battery voltage was dropping (meaning there was a load somewhere)
[14:41] <nats`> resolution 1ma.
[14:42] <aadamson> I separated the pv controller from the buck controller and the battery was still discharging
[14:42] <aadamson> the above was done with NO meter inline
[14:42] <nats`> uhhmmm that's really weird
[14:42] <aadamson> so from your understanding of the datasheet that shouldn't be the case?
[14:43] <nats`> nop clearly not
[14:43] <nats`> it could maybe with forced PWM mode
[14:43] <nats`> but with their shutdown mode you should be really lower
[14:43] <aadamson> really so where does the 3.8mA quiescent current apply?
[14:43] <nats`> maybe not at 15uA
[14:43] <nats`> but clearly not at 1mA
[14:44] <nats`> 3.8 is applying when PWM mode is forced
[14:44] <aadamson> well the question may be, when does the controller switch from PFM to PWM operation?
[14:44] <aadamson> at what current
[14:44] <aadamson> or does current not effect this?
[14:45] <nats`> seeing drawing page 6 I would say not before 10mA
[14:45] <aadamson> hmm... yes and I'm way below that
[14:45] <nats`> it seems you're in forced mode
[14:45] <nats`> that strange
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[14:45] <nats`> check page 6 the first Two
[14:45] <nats`> on left what you should have
[14:46] <nats`> on right what you get
[14:46] <moriarty> what?
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[14:46] <aadamson> yeah
[14:46] <nats`> you tied the mode pin directly to ground ?
[14:46] <aadamson> yeah, let me triple check that it really is :)
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[14:47] <nats`> if yes you should try to cut the trace and try to change that
[14:47] <nats`> see what it does tiing it to Vin and GND
[14:47] <nats`> and changing on the fly
[14:48] <aadamson> yeah it's to ground
[14:48] <nats`> check page 7
[14:48] <nats`> PWM mode is triggering around 100mA
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[14:48] <aadamson> yes I see that
[14:49] <aadamson> hmm... very strange
[14:49] <nats`> page 9 bottom right
[14:49] <nats`> what you should get :)
[14:49] <nats`> do you have a board with nothing else ?
[14:49] <aadamson> yes
[14:49] <aadamson> nothing else but the buck controller?
[14:49] <nats`> yep
[14:49] <aadamson> circuit
[14:50] <aadamson> I can build one
[14:50] <aadamson> also when Upu shows up, I can have him check, he uses the same design
[14:50] <nats`> could be interesting
[14:50] <aadamson> it's a very easy test
[14:50] <nats`> I see some possible failure
[14:51] <nats`> maybe cap or inductor related
[14:51] <nats`> since you rely on the tank capacity of your circuit when in PFM mode
[14:51] <nats`> if there are some problem on those two
[14:51] <nats`> it could keep the buck hashing
[14:52] <nats`> The converter effectively delivers a current to the output capacitor and the load. If the load is below the
[14:52] <nats`> delivered current, the output voltage will rise. If the output voltage is equal or higher than the PFM
[14:52] <nats`> comparator threshold, the device stops switching and enters a sleep mode with typical 15mA current
[14:52] <nats`> consumption.
[14:52] <nats`> basically maybe something in your design prevent the discontinuous mode from working
[14:52] <aadamson> 15uA?
[14:53] <aadamson> yeah... I just checked UPUs version, only change is he uses a 4.7uH coil and a 33pf cap, the test is the same except he's at 1.8v and I'm at 2.0v
[14:53] <aadamson> both are straight reference designs from Ti
[14:54] <nats`> and your source is high enough ?
[14:54] <nats`> (or it'll work in ldo mode)
[14:55] <aadamson> nats`, thanks for the comments, I needed another opinion...
[14:55] <aadamson> you've give me some things to check and maybe I can get Anthony to check one of his to see if his do the same
[14:56] <nats`> aadamson a quick look with an oscilloscope on output is often a good way to check that
[14:56] <aadamson> I'm going to build a second one just to make sure I don't have a problem with this one... Who knows I could have somehow damaged it
[14:56] <nats`> you'll be able to know if the buck is in PWM or PFM mode
[14:56] <nats`> and so having more insight on how to debug that
[14:57] <nats`> anyway in my opinion unless there are TI errata you shouldn't have the result you get
[14:57] <aadamson> by looking at figures 13/14 on page 9
[14:58] <aadamson> nats`, ok... thanks!
[14:58] <nats`> yep
[14:58] <nats`> and you'll see if something is screwing with the voltage
[14:58] <nats`> basically if you see your voltage falling quickly and going under the threshold there is a problem
[14:58] <nats`> let me know if you make som scope measure
[14:59] <nats`> I can help to debug on that
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[15:10] <Laurenceb__> http://tech.slashdot.org/story/14/05/11/138225/malaysia-airlines-flight-370-experts-unable-to-replicate-inmarsat-analysis
[15:10] <Laurenceb__> interesting
[15:22] Nick change: stilldavid_ -> stilldavid
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[15:34] <LeoBodnar> -85Hz ground based ping is 0.5PPM off
[15:34] <LeoBodnar> i doubt simple telemtry device uses anything better than 0.5ppm TCXO
[15:35] <LeoBodnar> they are looking for signs of logic in noise
[15:35] <LeoBodnar> surely Inmarsat have corrected for thermal LO drift on the plane device
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[15:36] <LeoBodnar> haven't they had to correlate this flight with hundresds of others? I assume for that very purpose
[15:36] <nats`> LeoBodnar I don't know for telemetry but GSM/3G infrastructure often use 100ppb to 250ppb tcxo
[15:37] <LeoBodnar> there is no reason to use that sort of precision in simple terminal equipment
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[15:39] <nats`> I hope they took that into the math if they use "low"precision tcxo
[15:39] <nats`> otherwise it's an epic fail
[15:41] <LeoBodnar> TCXO tolerance single-handedly explians the whole graph vertical offset yet it is not considered in teh article
[15:41] <LeoBodnar> http://www.theatlantic.com/technology/archive/2014/05/why-the-official-explanation-of-mh370s-demise-doesnt-hold-up/361826/
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[15:42] <LeoBodnar> i wouldnt call 0.5ppm TCXOs low precision
[15:43] <LeoBodnar> wait, epic fail
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[15:44] <mattbrejza> i would have thought it would be reasonably obvious bearing in mind the predicted tracks that immasat placed on the graph also start from the same 85Hz offset
[15:44] <LeoBodnar> 85Hz at 1.6GHz is 0.05ppm or 50ppb offset
[15:47] <nats`> 50ppb starts to be hard to reach even with an ocxo
[15:48] <nats`> uhhmm seems high end can reach 0.05ppb
[15:49] <nats`> I think they take that in the math or they are really stupid
[15:49] <LeoBodnar> i think that's what Inmarsat had to do when they did what they called "groundbreaking research"
[15:50] <LeoBodnar> compensate for thermal drift based on data collected from similar devices on similar flights
[15:50] <LeoBodnar> that armchair scientists have no access to
[15:51] <nats`> uhhhmm yep could be some sort of rouding of the error
[15:51] <nats`> but that's really tricky and random when talking about ppbs'
[15:51] <nats`> even a dwarf farting in the cockpit could change that :p
[15:51] <LeoBodnar> juts to make sure: article above is trying to disprove Inmarsat findings based on a single chart
[15:52] <nats`> duncan steel made compelte math
[15:52] <nats`> and there are some oscillator consideration in comment
[15:53] <LeoBodnar> but we don't know exact tempco curve of the TCXOs installed in Inmarsat equipment
[15:54] <nats`> the problem is even if they are right, it could be impossible to find the plane
[15:54] <LeoBodnar> you can invert the chart and it will still be inside TCXO tolerance
[15:55] <nats`> Leo did you see the duncan work it seems more complete
[15:55] <nats`> I can't really judge it not enough competence
[15:55] <LeoBodnar> no, i am talking out of my a** XD
[15:55] <nats`> http://www.duncansteel.com/archives/730
[15:56] <nats`> http://www.duncansteel.com/archives/526
[15:56] <LeoBodnar> but from simpleton perspective: no tempco - no conclusion
[15:56] <nats`> he found an other graph
[15:56] <SilverIV7> C programmers, this is right for double (00.0000) -> string conversions right? char strlat[32]; sprintf(strlat, "%f", location.lat());
[15:56] <adamgreig> yea, assuming location.lat() does what you want (it probably doesn't)
[15:57] <daveake> and assuming floating point sprintf support gets linked in
[15:57] <SilverIV7> it just returns the double, works fine display wise just not converting, appears as a ?
[15:57] <daveake> SilverIV7 Is this Arduino?
[15:58] <SilverIV7> yes
[15:58] <daveake> Thought so :p
[15:59] <daveake> By default, the library code for doing the %f formatting doesn't get linked in to your program
[15:59] <daveake> hence the fail
[15:59] <Laurenceb__> yeah you need to modify the makefile
[15:59] <daveake> You can either change a setting somewhere to make it work ^
[15:59] <Laurenceb__> if its normal avr....
[15:59] <daveake> or use dtostrf instead
[16:00] <daveake> all of which assumes, as adamgreig was asking, if location.lat() is actually a float
[16:00] <SilverIV7> okay, which is the best wat to go?
[16:00] <daveake> Well I use dtostrf
[16:00] <SilverIV7> yes it deffinately is
[16:00] <LeoBodnar> they don't even know if published chart is actual offset or corrected
[16:01] <LeoBodnar> if it would be corrected i'd expect to see error bars
[16:01] <Laurenceb__> i wonder if its more complex
[16:01] <Laurenceb__> and theres some sort of carrier sync process onboard the receiver
[16:02] <Laurenceb__> it looks like the offset is explained by dumb transponder on the sat
[16:02] <Laurenceb__> and carrier sync on the plane
[16:02] <LeoBodnar> bent pipe?
[16:02] <Laurenceb__> so the doppler is plane versus ground station
[16:03] <LeoBodnar> i find it alarming that authors are arguing what input data actually means
[16:03] <LeoBodnar> after drawing the conclusion
[16:03] <Laurenceb__> i spot use of wordart
[16:03] <Laurenceb__> on inmarsat pdf
[16:05] <SilverIV7> dtostrf() works perfectly, thanks!
[16:06] <mikestir-work> SilverIV7: as a general rule if you are using sprintf anywhere else, you should really use snprintf instead so that you don't risk overflowing your output buffer
[16:10] <aadamson> leobodnar, what if any buck converter do you use with you lipo setup?
[16:14] <LeoBodnar> same as you do
[16:17] <aadamson> well damn, you ever loomed at the current pulled from the battery when you have really low load? for 2ma load I have 7ma draw? does that make any sense?
[16:17] <aadamson> I tested by putting a 4.7k resistor as the load... with that I have 5ma draw
[16:18] <aadamson> sri im on phone at the moment
[16:20] <aadamson> on phone typing that is
[16:22] <LeoBodnar> no i don't seem to have that problem
[16:22] <aadamson> I'm going to build a second board just to make sure I don't have a component problem just trying to get a second opinion from you or Anthony
[16:22] <aadamson> ok
[16:24] <aadamson> I pulled the last component from the pv side so it was isolated and is not related to that
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[16:47] Nick change: sp2ipt_ -> sp2ipt
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[17:01] <SilverIV7> I'm sending data via the nxt2b but only like 5% of it arrives and is readable, the rest is just random junk? :s
[17:03] <SilverIV7> example (yes the format was incorrect in this example): http://thehablab.com/images/data-transmit.JPG
[17:03] <aadamson> LeoBodnar, do you think using a 2.2uH coil instead of a 4.7 as I think you and Anthony use would influence this issue... I've look at his schematic vs. mine, the only diff is I use a different VD because I'm at 2.0v and I use a 2.2uH coil. The one other diff is I use a 22pf Cap whereas his is a 33
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[17:04] <LeoBodnar> I have used 2.0 Vdd
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[17:28] Nick change: MichaelC3 -> MichaelC
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[17:39] <aadamson> LeoBodnar, are you using a 2.2uH or 4.7 for the coil on the buck controller
[17:39] <aadamson> I don't think that would be the issue, as I *built* the reference as is pretty much
[17:39] <aadamson> I'm suspect a component issue so am building a second board right now
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[18:16] <Lunar_Lander> hello
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[18:46] <sp2ipt> if anyone is interested I've done some photos with (poor) microscope of those dirtycheap pcbs
[18:46] <sp2ipt> http://sztormik.com/temp/dirtypcbs/dirtypcbs_x20_1.jpg
[18:46] <sp2ipt> http://sztormik.com/temp/dirtypcbs/dirtypcbs_x20_2.jpg
[18:46] <sp2ipt> http://sztormik.com/temp/dirtypcbs/dirtypcbs_x80_1.jpg
[18:46] <sp2ipt> http://sztormik.com/temp/dirtypcbs/dirtypcbs_x80_2.jpg
[18:46] <sp2ipt> http://sztormik.com/temp/dirtypcbs/dirtypcbs_x350_1.jpg
[18:47] <chris_99> is it me or is the silk screen a bit iffy, and the pads a bit scratchy
[18:47] <chris_99> not that it matter
[18:48] <chris_99> s
[18:48] <sp2ipt> chris_99: 6 mils spacing
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[18:57] <zyp> sp2ipt, got any pics of via hole alignment?
[18:57] <sp2ipt> zyp: not really, the board doesn't have any small VIAs, only four large ones for screws
[18:58] <sp2ipt> zyp: w8 a sec, I'll post the links
[18:58] <zyp> heh, what kind of design doesn't have vias? :)
[18:58] <sp2ipt> zyp: good one :)
[18:59] <zyp> silk screen looks like a typical raster printed one
[19:02] <sp2ipt> zyp: http://sztormik.com/temp/dirtypcbs/index.html
[19:02] <sp2ipt> behold by great HTML code :D
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[19:02] <SP9UOB-Tom> evening all
[19:02] <sp2ipt> SP9UOB-Tom: czesc
[19:02] <SP9UOB-Tom> czesc sp2ipt :-)
[19:02] <aadamson> Well dang it... must be something design related...
[19:03] <aadamson> second board does exactly the same thing...
[19:03] <zyp> sp2ipt, why don't you have vias stitching togetherthe ground planes?
[19:04] <sp2ipt> zyp: it's really not needed for this design - it's a simple circuit giving an impulse on two coils for the relay
[19:04] <sp2ipt> zyp: 6mil spacing is an overkill here
[19:05] <sp2ipt> zyp: there could be no ground plain and it'd workg the same way
[19:05] <sp2ipt> s/plain/plane ;)
[19:05] <sp2ipt> wathich a video on the second pc :D
[19:10] <SpeedEvil> http://www.dx.com/p/t-588-handheld-wireless-8w-7-4v-400-480mhz-128-ch-walkie-talkie-black-silver-multi-colored-316173 - teeeny bit illegal
[19:13] <Upu> well
[19:13] <Upu> the UV-5R's are hardly law abiding
[19:14] <Upu> whats the exempt power limit 0.5w ?
[19:14] <SP9UOB-Tom> 500 mW and no detachable antenna in Poland
[19:15] <Upu> I think its the same here
[19:15] <Upu> mind you UV-5R makes a lovely igate
[19:15] <Upu> cheap as chips
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[19:28] <sp2ipt> no detachable ant and max gain 0dBd
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[19:31] <RB__> What happened to B50?
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[21:09] <aadamson> Ok, well I think I know what the issue is with the buck controller
[21:11] <aadamson> the FB pin/trace was ran directly under the coil.... That probably isn't good... see note in datasheet :(...
[21:11] <SpeedEvil> :)
[21:11] <aadamson> hmm... so I wonder if I can cut the trace and blue wire it and fix the issue
[21:11] <SpeedEvil> likely
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[21:12] <aadamson> yeah that EMF from the coil can't be a good thing and I'm sure it's causing the controller to go into some *osc* event.
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[21:12] <aadamson> I noted on the original board yesterday that with no load connected, I could stop the 5ma current draw by putting my finger is certain places on the board... that should have been my first clue
[21:13] <aadamson> I can stop the osc, but once the chip is providing power, I can't, those expansion and contraction of the coil are probably killing the FB logic
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[21:29] <aadamson> hmm, maybe even no blue wires... pull 2 components, cut one trace and tack the components back in else where... hmm... fun surgery
[21:31] <nats`> aadamson if your feedback is changing on each switching cycle
[21:31] <nats`> the driver needs to change the output voltage to stay within the top 1%
[21:31] <nats`> and so can't go to PFM mode
[21:31] <nats`> cut the trace going under the coil
[21:31] <nats`> put a wire going far from the switching side
[21:32] <aadamson> yep, so I'm going to cut that trace and move 2 componets to get everything away from the SW pin
[21:32] <aadamson> it should be pretty easy
[21:32] <aadamson> but I'm thinking this *is* the issue
[21:33] <aadamson> I just so wish I had a microscope at the moment :)
[21:33] <nats`> microscope ?
[21:33] <nats`> for what ?
[21:34] <aadamson> for 0603 components with 50yr eyes :)
[21:34] <nats`> not sure it's a sldering problem
[21:34] <aadamson> the kind made for smt work with a nice ring light ect :)
[21:34] <nats`> maybe your coil is just inducing current in the FB track
[21:34] <aadamson> oh, it not, it's a working in a small area problem :)
[21:34] <nats`> did you validated simply that it comes from that ?
[21:35] <nats`> by just replacing the track by a wire taking an other path
[21:35] <nats`> ?
[21:36] <aadamson> the VD is in the wrong place actually and to get everything away from the SW pin, Its just easier to pull the VD and cut the FB trace, and then I can solder one of the resistors on top of the 22pf cap and the other on one side of that same cap to a round right there as well
[21:36] <aadamson> round = ground
[21:37] <aadamson> the above is the easiest way to get everything right
[21:37] <nats`> yep but before going invasive surgery it's better to check the bug is really what you think :)
[21:38] <nats`> time to bed
[21:38] <nats`> night all
[21:38] <aadamson> yeah, I know, I'm just concerned that if I cut the trace at the FB pin it's still under the inductor and at the opposite end is the first resistor of the VD. so just taking a wire there may not solve the issue... thanks nats
[21:38] <aadamson> and gn
[21:41] <SpeedEvil> Capacitive coupling still exists - but you lose the indutive coupling whih is likely causing the issue
[21:42] <aadamson> yeah with this change it should be no worse than the ref design (needs to be fixed right), but at the moment I'd just like to make an improvement... my OCD in full gear :)
[21:43] <aadamson> and that resistor and cap are suppose to be in parallel
[21:44] <aadamson> oh, well, time to feed and walk the dogs and ponder the universe :)... Thanks all for the feedback/comments/especially nats` he got me thinking today which let to this discovery
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[22:01] <malclocke> KiwiDeanWork, I take it you are Dean from Chch?
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[22:08] <fsphil> hah, B-51
[22:09] <SpeedEvil> He's actually been secretly working up to his next balloon.
[22:09] <SpeedEvil> Which will have a 32000kg payload.
[22:09] <fsphil> launching from the love shack
[22:10] <LeoBodnar> lolz
[22:11] <malclocke> :)
[22:17] SV1NJX (5e479adb@gateway/web/freenode/ip.94.71.154.219) joined #highaltitude.
[22:17] <SV1NJX> Hello
[22:17] <fsphil> g'day
[22:18] <SpeedEvil> http://en.wikipedia.org/wiki/Zip_fuel - the next big thing in high performance jets (in 1950)
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[22:20] <SV1NJX> J43VHF balloon mission succeeded. Max alt 30886m, max velocity 228Km/h , lowest temp -33 celcius. CW beacons heard in a really wide area. Thanks for supporting j43vhf.wordpress.com
[22:20] <fsphil> good to hear!
[22:21] <mattbrejza> was just about to tune the radio for b51 but apparently its already receiving
[22:22] <craag> lol mattbrejza
[22:22] <fsphil> rsid is proving really useful
[22:22] <SV1NJX> Payload still missing but located by aprs and hopefully will be retrieved
[22:23] <fsphil> oh not so good news
[22:23] <fsphil> good luck!
[22:24] <SV1NJX> tnx, hope to get the camera :)
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[22:34] <SilverIV7> what's the difference between transmitting at 50 or 300 baud?
[22:43] <mikestir> 50 baud will work with a weaker signal than 300 baud
[22:43] <mikestir> but it's slower (obviously)
[22:43] <mikestir> 300 baud is preferred for ssdv
[22:44] <mikestir> ping aadamson
[22:45] <SilverIV7> ah oaky that makes sense, thanks! what about the serial baud speed? 4800 / 115200
[22:46] <mikestir> for the gps?
[22:47] <mikestir> 9600 is default iirc
[22:48] <craag> for ublox yes, some other modules are 4800
[22:48] <craag> Whatever is the default is probably the best idea, that way if it resets in flight you don't have to worry about dropping back and reconfiguring it
[22:49] <Laurenceb_> does anywhere have beaglebone black in stock?
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[22:51] <mikestir> anyone familiar with the edu version of the segger jlink?
[22:54] <SilverIV7> no i mean the serial monitor, you can set the baud for that as well?
[22:54] <LeoBodnar> it's grey mikestir
[22:54] <SilverIV7> for aduino that is
[22:55] <mikestir> LeoBodnar: it's black isn't it? or is that the knock-offs?
[22:56] <LeoBodnar> no full version is black, edu version is grey
[22:56] <LeoBodnar> Atmel version is blue
[22:56] <LeoBodnar> well maybe it has changed recently
[22:57] <LeoBodnar> mine is grey
[22:57] <mikestir> is it good? I'm currently wasting time trying to get an stlink to program a kinetis using openocd, and I'm thinking I might just buy a jlink instead
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[22:57] <mikestir> the stlink managed it once, but now it refuses to connect
[22:57] <LeoBodnar> yeah, it bugs you every new day with educational only popup but it's ok otherwise
[22:58] <LeoBodnar> and not as fast as full pro version but very good value still
[22:58] <mikestir> yeah it's under 50 quid from farnell including the vat
[22:59] <LeoBodnar> sounds ok
[23:01] <mikestir> think I'll order one tomorrow once I've verified there isn't one lying around at work
[23:01] <mikestir> anyway. gn
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[23:04] <aadamson> Hey mikestir let me catch up
[23:04] <aadamson> yeah mine (edu) is gray, and I really like it
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[23:15] <aadamson> yeah!!!! I believe I've fixe dit
[23:15] <aadamson> fixed it
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[23:39] <Darkside> yes, do try not confusing latitude and longitude
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[23:54] <Lunar_Lander> good night
[23:55] <mauhen> Evening all, what frequency and modulation is B51 using?
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[23:57] <craag> mauhen: Contestia 8/250, 434.500
[23:57] <craag> Select autoconfigure and enable RSiD
[23:58] <mauhen> OK thanks
[00:00] --- Tue May 13 2014