highaltitude.log.20150119

[00:01] <craag> KF5WYX: If you're wanting to do APRS, you'll need PWM to modulate AFSK
[00:01] <KF5WYX> That sounds familiar, what's a PWM?
[00:01] <craag> Pulse width modulation
[00:02] <craag> Basically a way to create an analogue signal from the AVR
[00:02] <KF5WYX> Thank you :-) That's exactly what I needed.
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[00:03] <KF5WYX> So basically, I control the length of the pulse from the digital pin to generate a frequency on the radio.
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[00:05] <craag> To create a 1200 Hz tone, as needed for one of the APRS tones, you'll need to put a 1200Hz Sine WAve into the HX1
[00:05] <KF5WYX> scribbles this down in notes.
[00:07] <craag> To create the analog signal of the Sine wave, you'll need to use PWM
[00:07] <craag> And vary the duty cycle of the PWM with a sine function or lookup table
[00:07] <KF5WYX> And I'd guess that pin3 of the arduino can be programmed to be an analog pin. (I'd better check that)
[00:07] <craag> Yeah read up on arduino pwm
[00:08] <craag> Have a go at creating arbitrary analog voltage to get the idea
[00:10] <sinjin> Hello all. I'm new to ballooning and I'm hoping someone can help with a question. On a recent launch our flight data recorder failed. We have full video from launch to touchdown. From launch to burst was 82 min 7 sec. Payload = 1200g, Balloon = 300g , Volume of Helium = 2.5 cu meters. Any suggestions on deriving an approximate altitude at burst?
[00:10] <adamgreig> hmmmm
[00:10] <adamgreig> did you get any data from the recorder?
[00:10] <sinjin> None.
[00:10] <KF5WYX> I'm concerned because my break-out board has analog pin headers, but I appear to have wired up to one of the digital pins. I'll double check to see if it's right ( Probably programmable ), and if not I'll mod the board.
[00:11] <adamgreig> so sinjin
[00:11] <adamgreig> 1200g payload, 300g balloon, would take 82 minutes to burst at an altitude of 19650m
[00:12] <adamgreig> http://habhub.org/calc/
[00:12] <adamgreig> you can plug 1200g payload, 300g hwoyee balloon, 19650m burst altitude into that
[00:12] <adamgreig> and it takes 82 minutes to burst
[00:12] <KF5WYX> Appears it is programmable *phew*
[00:12] <adamgreig> with a fairly reasonable ascent rate of 4m/s
[00:12] <adamgreig> so I would guess you got 20km within 1 or 2 km
[00:15] <sinjin> Thanks adamgreig ... what might be the best way to deal with the discrepancy of helium volume? Split the difference?
[00:15] <adamgreig> how do you know how much helium you put in?
[00:16] <adamgreig> your time to burst measurement is accurate to within a few seconds on 82 minutes, which is like 0.04% or something (!)
[00:16] <adamgreig> your helium volume measurement is probably good to within 50% maybe? I'm assuming you didn't use a mass flow meter
[00:18] <sinjin> We measured the circumference of the balloon to exactly 5.33m prior to launch. The balloon was almost a perfect sphere, so using the volume of a sphere formula.
[00:19] <adamgreig> hmm, that's more effort than i would usually go to! are you sure the balloon was spherical?
[00:19] <adamgreig> physics suggest they won't be, right?
[00:19] <adamgreig> the gas wants to be in the top of the balloon
[00:19] <adamgreig> so they are an inverted teardrop sort of shape
[00:19] <adamgreig> the latex resists that somewhat but not much
[00:21] <adamgreig> so like, the burst diameter of the 300g balloon is not very well specified
[00:21] <sinjin> Up close and in video of the launch it seemed very spherical.
[00:21] <adamgreig> which is the main thing hindering your attempt to get a good estimate of burst altitude
[00:21] <sinjin> Yes, the CPR-300 seems to be lacking a datasheet
[00:21] <adamgreig> i guess if it was a very full balloon it would probably get more and more spherical
[00:21] <adamgreig> was there a cloud layer?
[00:22] <sinjin> Yes.
[00:22] <adamgreig> look up weather observations, get its altitude
[00:22] <adamgreig> time how long it took you to hit the clouds
[00:22] <adamgreig> ascent rates are pretty much dead flat the entire ascent
[00:23] <adamgreig> it gives you another data point if nothing else
[00:23] <sinjin> Excellent idea! I'll try that. Thank you!
[00:23] <adamgreig> average that, the altitude from 82 minutes of ascent, and the altitude from 2.5m² of helium initially
[00:23] <adamgreig> and you'll probably be within a km
[00:24] <adamgreig> ~17680m for 2.5m² of helium
[00:24] <adamgreig> but that's 62m until burst, nominally
[00:27] <sinjin> Yeah, the predictions are all off a bit with the time or the helium. I'm okay with a margin of error, but just trying to do due diligence.
[00:29] <adamgreig> sure. if you can get cloud cover as well, see where it lies
[00:29] <adamgreig> i'd put more margin in the time than in the launch volume estimate personally
[00:29] <ashaman_> Anyone used the OSX version of dl-fldigi along with a usb radio reciever?
[00:29] <adamgreig> uhm, that was ambiguous - I mean I'd trust the altitude derived from time more than volume
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[00:31] <ashaman_> in a bit of a bind getting data
[00:31] <sinjin> Okay, I'm off to find cloud altitude data! Thank you!
[00:33] <adamgreig> good luck
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[04:50] Action: Oddstr13 is having trouble figuring out how the buttons on the NEXA NEYCT-705 remote is working
[04:52] <Oddstr13> I'm starting to think it might be easier to reverse engineer the radio protocol than it is to reverse engineer the physical remote control
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[05:06] <SpeedEvil> you can cheat and probe the inptu or output of the RF transmitter/receiver - ratehr than having to sniff RF.
[05:09] <Oddstr13> well, capturing the data burst in AM mode gave a nice square wave when opened in audacity
[05:10] <Oddstr13> http://cosa-arduino.blogspot.co.uk/2013/05/more-rf433-wireless-home-automation.html This looks neat.
[05:10] <KF5WYX> craag still here? I know it's late there.
[05:21] <KF5WYX> Q. When feeding fsk to the hx1, why is a sine wave important? why not square wave @1200/2200 or even sawtooth?
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[06:05] <SpacenearUS> New vehicle on the map: 03Avrphys_chase - 12http://habhub.org/t/#!qm=All&q=Avrphys_chase
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[07:32] <Vaizki> any suggestions for a 70cm receiver-only radio?
[07:36] <UpuWork> SDR or real one ?
[07:38] <Vaizki> well SDR would be fine but something better than RTL-SDR...
[07:39] <LazyLeopard> FunCube?
[07:39] <UpuWork> yup
[07:40] <LazyLeopard> Much of the receiving's down to getting a decent antenna...
[07:40] <LazyLeopard> ...or making one.
[07:40] <Vaizki> yea I think I have that sorted
[07:41] <Vaizki> http://www.diamondantenna.net/x50na.html
[07:41] <UpuWork> yep that will do
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[07:45] <Vaizki> I looked at these SDRs years ago and funcube didn't get that raving reviews but apparently it's gotten better
[07:47] <mfa298> The newer Pro+ is better than the original funcubes
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[07:51] <Vaizki> ok.. and are there any affordable models with ethernet connectivity?
[07:51] <Vaizki> or do I just slap a funcube on a BBB?
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[08:44] <mfa298> Vaizki: you may be able to plug it into a BBB or Pi and stream the data over a network connection. Although I think most people plug it directly into a PC and use the software directly as you will get more control
[08:45] <Vaizki> yea it's just that the station and my pc will be about 200km apart
[08:46] <Vaizki> but of course I understand all the problems associated with network streaming of audio
[08:46] <SpacenearUS> New position from 03SVC_PI_SKY after 039 hours silence - 12http://habhub.org/t/#!qm=All&q=SVC_PI_SKY
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[08:47] <craag> Part of the issue is often the bandwidth availible
[08:47] <craag> What's the bottleneck station -> PC?
[08:48] <mfa298> if the remote station has a reasonable internet link you might be better off running something like a websdr. Especially if it's in an interesting location.
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[08:48] <craag> Also the websdr demodulates at the station end.
[08:49] <craag> Meaning you need less bandwidth
[08:49] <craag> rather than streaming 2x 192 kBps
[08:49] <fsphil> but more cpu power than a pi
[08:50] <craag> Hmm you could do it with an fcd on a pi I reckon
[08:50] <craag> pretty sure a few people have
[08:50] <fsphil> maybe with the 96khz firmware
[08:50] <Vaizki> yea well the internet link is "reasonable" as in about 4-5Mbps uplink over 3G
[08:50] <mfa298> Mike's websdr code didn't seem to be far off running an rtlsdr on a pi.
[08:51] <Vaizki> BBB has a bit more cpu than pi
[08:51] <Vaizki> what's fcd?
[08:51] <craag> Vaizki: Streaming the full bandwith would require a constant 3Mbps
[08:51] <craag> funcube dongle
[08:51] <Vaizki> yea that's what I'm thinking, it's not enough
[08:52] <craag> fsphil: Are you saying you've tried with 192khz, and it didn't work?
[08:52] <mfa298> you probably also want fairly low jitter so you don't have to buffer too much data. Otherwise changing settings could become a pain
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[08:55] <fsphil> craag: yea tried on a PiB, got the same error as on my laptop
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[08:55] <fsphil> not tried on a B+ at 192khz yet, but it's currently working happly at 96khz
[08:56] <craag> B+ won't have any improvement I reckon
[08:56] <Vaizki> B+ is same cpu
[08:56] <craag> Ok, thanks, good to know
[08:56] <fsphil> smarter usb hub
[08:56] <Vaizki> just more usb, better power and more gpio
[08:57] <craag> Just more ports on it, same core
[08:57] <fsphil> the new usb hub handles different speed usb devices a bit better
[08:58] <mfa298> depends if the issue was cpu performance / cpu usb bus, or issues with the usb hub on the PiB
[08:58] <fsphil> honestly I think this is possibly a software bug
[08:58] <Vaizki> I experimented with the original B when it came out but got frustrated with the USB and the usb-bridged ethernet
[08:58] <fsphil> it did used to work on my old laptop just fine
[08:58] <Vaizki> so I hope those worries are gone now
[08:58] <craag> hmm - I'm very sure it was the same apart from the hotplug power
[08:59] <Vaizki> ended up using the BBB for my projects and been happy with it
[08:59] <craag> I had a go with the BBB, but lack of hotplug usb was annoying
[08:59] <craag> is that fixed now?
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[09:00] <fsphil> bit of a flaw
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[09:01] <craag> just a little, especially when using usb devices that had a habit of crashing, and rebooting the bus
[09:02] <Vaizki> hmm not sure actually
[09:03] <Vaizki> last time I tried I think it worked if you had something plugged in at boot
[09:03] <Vaizki> then you could remove and reinsert it ok
[09:03] <Vaizki> but if you booted without anything in the usb ports, then the usb controller driver would get buggered
[09:03] <craag> fun
[09:04] <mfa298> of course if you want a bit more CPU power there's a whole range of alternatives now ODROID-C1, BananaPi
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[09:05] <mfa298> although I still need to do something useful with my BananaPi
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[09:07] <Vaizki> regarding SDRs, any of you used the Afedri SDR-Net? A friend of mine has one but I've yet to see it in action. He's ofcourse of the opinion that it's the best thing since oxygen but then again he bought one :)
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[09:11] <Vaizki> at least the specs look nice, BW = up to 1850kHz (for 2000k samples/s sample rate)
[09:11] <Vaizki> and no, I'm not going to stream that over 3G ...
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[09:27] <fsphil> you could stream a small part of it
[09:27] <fsphil> wonder what effect a codec like opus would have on i/q data... :)
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[09:40] <Vaizki> ok hmm airspy is shipping and in stock?
[09:40] <Vaizki> I might go for one of those instead of funcube
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[10:08] <fsphil> ok opus did terribly at compressing iq data
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[10:10] <Maxell> Vaizki: yeah, I would prefer airspy.
[10:10] <Maxell> "The 2nd batch is almost sold out!"
[10:10] <Vaizki> eep!
[10:13] <Vaizki> YOUR ORDER HAS BEEN RECEIVED.
[10:13] <Vaizki> Thank you for your purchase!
[10:15] <Maxell> :-)
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[10:24] <fsphil> no HF annoyingly
[10:24] <fsphil> well, not much HF
[10:32] <mfa298> the various dongles have advantages. I'm not sure it's possible to have a standard this is best.
[10:33] <fsphil> yea depends on intended use
[10:33] <fsphil> the rtlsdr's still have a huge price advantage
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[10:42] <Vaizki> yes and I have 2 of them.. but they are random ones, not sure what is the "best one"
[10:51] <mfa298> I've got a E4000 and a few of the r802t. like everythign else it depends a bit on what you want
[10:52] <mfa298> my E4000 doesn't work for ads-b (not that I've played with that in a while) - some do work, some dont as there's a hole that ends just by the ads-b frequency
[10:52] <mfa298> but I think the E4000 wins out at some other stuff (possibly a higher top frequency)
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[13:11] <Piet0r> E4000 has a gap between 1100-1250MHz
[13:12] <Piet0r> Maybe the ones you have are a bit off .. tho 10MHz off is quite a lot
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[13:39] <jededu> Hackvana
[13:39] <jededu> mmm
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[16:17] <Piet0r> Vaizki: Did you buy an AirSpy?
[16:17] <Piet0r> They are like very expensive, right?
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[16:22] <Vaizki> I did buy one yes
[16:22] <Vaizki> I don't consider it very expensive though
[16:23] <Vaizki> 199 USD
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[16:28] <Piet0r> Oh just the USB-thingy?
[16:29] <Maxell> "Just"?
[16:29] <Maxell> Airspy is software defined radio. It's all USB baby
[16:29] <Piet0r> Oh wait
[16:30] <Piet0r> I confused it with the Wi-Spy
[16:30] <Maxell> Right.
[16:30] <Piet0r> They cost $449 :x
[16:30] <Maxell> Hey Piet0r... I stole your antenna-pole design for my own x30
[16:31] <Piet0r> hm?
[16:31] <Maxell> http://blog.tuxie.com/2013/06/30/nieuwe-antenne-diamond-x30n/ :)
[16:31] <Piet0r> Ha!
[16:32] <Piet0r> Funny
[16:32] <Maxell> You antenna has the N-type plug. Why on earth did you get a converter to fit it on your PL-connector cable?
[16:32] <Piet0r> Because I re-used my HF coax cable
[16:33] <Maxell> Yeah, but soldering on a new coax plug is worth the time vs losses.
[16:33] <Piet0r> Yeah I did that already :p
[16:33] <Piet0r> I moved to Soesterberg so I had to redo everything anyway
[16:34] <Maxell> Ah, ok. Here in The Hague we do have some more wind I presume, but it is holding fine.
[16:34] <Maxell> 4 meter rvs was not cheap though!
[16:34] <Maxell> Oh, and my x30 fits *inside* the tube :)
[16:34] <Piet0r> I have it on an aluminum pipe from Praxis
[16:35] <Piet0r> Awesome!
[16:35] <Piet0r> I wanted to do that also but it didn't fit :/
[16:35] <Maxell> Might be why it was expensive, custom order. :)
[16:35] <Maxell> But yeah, also more "grindtegels".
[16:36] <Piet0r> Why not the "CV-pijp"?
[16:36] <Piet0r> It is galvanized
[16:36] <Maxell> RVS is stronger.
[16:36] <Piet0r> True
[16:36] <Maxell> And feet mount is custom too :P
[16:37] <Maxell> http://i.sigio.nl/abfc4988587330ca1ec2b85b8cbd95a8.jpg
[16:37] <pc1pcl> heh, looks a lot like my setup too, probably the same 'tegelvoet' and 'balkonbeugel'..
[16:37] <Piet0r> Sounds expensive
[16:37] <pc1pcl> even the cut up pieces of 'rubbertegel' ;)
[16:37] <Maxell> Oh, I went for mix of "ringmatten" and "rubbertegel" :P
[16:38] <Maxell> Piet0r: custom as in, diy :)
[16:40] <Maxell> Large images incoming: http://i.sigio.nl/862d9e7c9fb71efd8917be23603eb43f.jpg
[16:40] <Maxell> http://i.sigio.nl/46fa24025867bb9ebdfdfd7df9fd8d02.jpg
[16:40] <Maxell> http://i.sigio.nl/641b2f8224e9d462e1331a235d78098a.jpg
[16:41] <Maxell> Also, use more "vulcaniserende tape" http://i.sigio.nl/fb38551cdd828f27ed73617298e730ed.jpg
[16:41] <Piet0r> http://www.tuxie.com/~pieter/antenna/image_3.jpg
[16:41] <Piet0r> With dish: http://www.tuxie.com/~pieter/antenna/image_4.jpg
[16:41] <Piet0r> Aluminum tube with top cap:http://www.tuxie.com/~pieter/antenna/image_5.jpg
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[16:42] <Maxell> More!! http://i.sigio.nl/c20c7d15d3fb790b322a7eaf60a7b381.jpg :P
[16:42] <Maxell> brb
[16:42] <Piet0r> Maxell: is there a dead guy on your roof? :p
[16:43] <Piet0r> I'm going home
[16:43] <Piet0r> Back in 1 hour
[16:44] <Maxell> ok
[16:44] <Maxell> cya aroung!
[16:46] <Maxell> Piet0r: nah, dead walrus ;)
[16:46] <Maxell> Tried to get rid of him http://i.sigio.nl/26c5cd1cfc80800e8f6a59b37cf24159.jpg
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[17:12] <KF5WYX> Greetings.
[17:15] <storm_home> hi all
[17:15] <KF5WYX> hello storm
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[17:32] <storm_home> what material do you guys use for thermal isolation: ordinary foam boxes or any more specific material?
[17:34] <craag> ordinary polystyrene boxes
[17:34] <craag> just seal them as well as you can
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[17:36] <KF5WYX> Hi craag. After what you said yesterday I began studying FSK. What you said about generating a sine wave confuses me (I wonder why a sine wave rather than square, or sawtooth). All the sources I've found so far show sine wave use, but I just don't get why. Are you able to clarify?
[17:37] <craag> A sine wave is a single tone
[17:37] <craag> the purest tone is a perfect sine wave
[17:38] <craag> APRS AFSK works by using two tones, one at 1200hz, and one at 2200hz (if i remember correctly)
[17:38] <KF5WYX> so it locks the tone to a solid frequency.
[17:38] <KF5WYX> 1200/2200 agrees with all that I've read so far yes.
[17:39] <craag> Using AFSK (audio on FM), means you don't have to worry about rf frequency accuracy
[17:39] <craag> so a 1200HZ tone at the transmitter, will be 1200hz at the receiver
[17:40] <KF5WYX> That also brings up another minor confusion for me. 1200Hz @ 1200Baud, so each single wave is 1-bit of data?
[17:40] <craag> Err yes it would be
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[17:41] <KF5WYX> I see, I guess that explains how the 2200 is detected as the alternate state, given that it's 2 waves in the same period
[17:41] <Lunar_Lander> evening
[17:42] <KF5WYX> Evening Lunar
[17:42] <daveake> Yes it's 1200/2200, and yes 1 bit = 1 cycle at 1200 but 1.833 cycles at 2200
[17:42] <KF5WYX> Thank you craag. I'll still need to do a little reading on how to make this all happen on the arduino, but that helps me to understand.
[17:42] <craag> np :)
[17:42] <daveake> So the modulator needs to be able to switch frequency at any point during a cycle
[17:42] Action: craag -> home
[17:43] <KF5WYX> lol @ self, thanks daveake - 22 != 12*2 -doh-
[17:43] <daveake> Yes, thus avoiding listening to a harmonic of 1200
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[18:05] <Laurenceb> http://en.wikipedia.org/wiki/Conroy_Tri-Turbo-Three
[18:05] <Laurenceb> lolling
[18:08] <Upu> why ?
[18:09] <Laurenceb> looks absurd
[18:09] <Upu> yup but pratical
[18:09] <Upu> the rotaty engines used avgas which was in short supply in the polar regions
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[18:09] <Upu> rotary
[18:09] <Upu> that uses jet fuel
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[18:12] <zyp> avgas is not jet fuel
[18:14] <zyp> avgas strictly refers to aviation grade gasoline, used in piston engined aircraft
[18:15] <Vaizki> that's what he said
[18:16] <Vaizki> Conroy modded the dc3s from avgas to jet fuel engines
[18:16] <Vaizki> And 2 --> 3 engines
[18:17] <zyp> oh
[18:17] <zyp> I read it as «rotary that uses jet fuel»
[18:17] <zyp> hence my confusion
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[18:19] <Vaizki> ah I see how you got that yes...
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[18:32] <SpacenearUS> New vehicle on the map: 03PI_SKY_PLUS - 12http://habhub.org/t/#!qm=All&q=PI_SKY_PLUS
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[18:54] <Vaizki> hmmh I am looking at PI_SKY_PLUS on the habhub map and the "path" seems to be bugging
[18:55] <Vaizki> sometimes it's showing a 11k km path starting from east siberia
[18:55] <Vaizki> and sometimes what I suspect is the real path
[18:56] <Vaizki> now I see a 11045.7km path again
[18:56] <Vaizki> esce
[18:56] <Vaizki> oops.. except now it starts from Kazakhstan
[18:57] <Vaizki> that is one international balloon of mystery
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[19:00] <Upu> odd Vaizki
[19:00] <Ian_> Yes, it looks like it's the prediction that is changing violently., is it actually airborne or a Upu test?
[19:00] <daveake> test
[19:00] <Ian_> A case of Ay upu . . .
[19:00] <Upu> Tis me
[19:00] <Upu> testing PITS+ boards
[19:09] <Laurenceb> any si446x users here?
[19:10] <Laurenceb> I'm try to make one do... anything
[19:10] <Laurenceb> has anyone here run one from a TCXO?
[19:12] <Laurenceb> if I hadnt seen it used Id say this thing was unusable
[19:12] <ak4rp1> did you AC couple it?
[19:13] <ak4rp1> did you check if it does not exceed the maximum swing which is specified in another obscure appnote of theirs?
[19:14] <Laurenceb> yes
[19:14] <Laurenceb> hmm
[19:14] <ak4rp1> are you feeding it via xin?
[19:14] <Laurenceb> yes
[19:15] <Laurenceb> hmm mine is close to 1.4v, but not exceeding it
[19:15] <Laurenceb> but even if i dont use the power up command
[19:15] <ak4rp1> IIRC DC coupling drove mine crazy
[19:15] <Laurenceb> most of the time I get CTS stuck low
[19:16] <Laurenceb> ive yet to exceed ~0.1% of writes succeeding
[19:17] <Laurenceb> earlier today I noticed that POWER_UP caused CTS to jam low
[19:17] <Laurenceb> but now I see that just trying to get the part number
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[19:19] <Laurenceb> https://github.com/Laurenceb/STM32_Launcher/blob/master/Silabs/si446x.c
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[19:22] <qyx_> Laurenceb: aadamson drove it from cdcel913 or whatever it was
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[19:22] <Laurenceb> ok
[19:22] <Laurenceb> yeah this should work
[19:23] <Laurenceb> for some reason POR is high
[19:23] <Laurenceb> thats not right
[19:23] Nick change: pjm -> Guest19679
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[19:24] <ak4rp1> ú
[19:24] <qyx_> i have boards and tcxo here, probably i could test it too
[19:25] <qyx_> but no passives for rf part
[19:25] <Laurenceb> I'm gunna investigate POR/NIRQ/CTS sequencing
[19:25] <qyx_> whats CTS
[19:25] <qyx_> i assume its not clear to send
[19:26] <ak4rp1> try adding a second cap to divide down the tcxo clock if you suspect overdrive
[19:26] <Laurenceb> for some reason it just decided to send me
[19:26] <Vaizki> I'd be surprised if it's not clear to send
[19:26] <Laurenceb> p/x rx_buffer $10 = {0xff, 0xff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
[19:27] <Laurenceb> no theres no way its overdriven
[19:28] <Laurenceb> can anyone tell me if POR should be high or low?
[19:33] <Laurenceb> I have POR high in "normal" operation
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[19:42] <ak4rp1> it's high, see datasheet, p19
[19:42] <Laurenceb> ah thanks
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[19:50] <Laurenceb> hmm yeah it looks like silabs doesnt like my boot command
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[20:11] <Laurenceb> ok I just got the config on a logic analyser
[20:11] <Laurenceb> 0x2, 0x1, 0x1, 0x1, 0x8c, 0xba, 0x80
[20:11] <Laurenceb> seems sensible
[20:11] <Laurenceb> for 26Mhz tcxo
[20:12] <Laurenceb> but it just caused CTS to jam low
[20:12] <Laurenceb> a few % of the time CTS comes up after a few milliseconds
[20:13] <SpeedEvil> All the pullups/downs are set right - it's not a 'random noise' thing?
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[20:17] <Laurenceb> cant see how
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[20:22] <Laurenceb> maybe its the tcxo, its is probably a tad over 1.4v
[20:22] Action: Laurenceb bbl
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[20:37] <manstallion> Hi, again....asked last week about PITS board no GPS lock, sorted now but not while running on batteries?
[20:39] <Upu> hi Man
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[20:39] <Upu> yeah the on board regulator on the original Pi is rubbish
[20:39] <Upu> and doesn't seem able to power everything on the Pits board at the same time from the USB
[20:40] <Upu> it brown outs
[20:42] <manstallion> Is it worth running the board on batteries but also feeding the Pi with battery supply...increases weight of payload tho'
[20:42] <daveake> 4 fresh AAs into the PITS board will be fine. If you're using a model B then use an A instead.
[20:44] <manstallion> Were using a B to develop so I'll give the A a try
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[20:48] <Vaizki> Upu: I checked your pi in the sky shield.. nice.. are you also killing the +5V bus on the pi? I guess you don't need it for anything really
[20:49] <Upu> no the A+/B+ boards need to be back powered with 5V
[20:49] <daveake> The 5V bus does need power but 3.3V is enough
[20:49] <daveake> ^ A/B
[20:49] <Vaizki> hmh?
[20:49] <daveake> On the A and B you can just put 3.3V on the 5V line and it runs fine
[20:50] <Vaizki> I have only used the model B and it works without 5V
[20:50] <Vaizki> righ
[20:50] <Vaizki> right
[20:50] <daveake> i.e. strap 3.3 and 5V together
[20:50] <Vaizki> USB and HDMI die
[20:50] <Vaizki> who cares
[20:50] <daveake> No they don't
[20:50] <daveake> I've run various USB devices on 3.3V
[20:51] <daveake> No doubt some devices need 5V, but not any I've tried so far
[20:52] <Vaizki> that's interesting, well I didn't spend that much time on it
[20:52] <Vaizki> I went to BBB because of the ethernet problems on the Pi
[20:52] <Vaizki> and have been happy with the BBB because I don't run any video output
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[21:00] <Babs> ping upu
[21:04] <Upu> evening Babs
[21:04] <Babs> hey upu - will pm
[21:04] <Upu> nps
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[22:15] <SpacenearUS> New vehicle on the map: 03DUTCHHAB - 12http://habhub.org/t/#!qm=All&q=DUTCHHAB
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[22:19] <SA6BSS-Mike> Vaizki: god to know when your airspy arrives http://www.rtl-sdr.com/screening-mods-airspy/
[22:19] <Vaizki> yea I noticed that already
[22:19] <Vaizki> but thanks for the heads up
[22:20] <Geoff-G8DHE> Before you try that have a word with prog in #airspy !
[22:21] <Vaizki> oh I don't do mods 1 day after they're out
[22:21] <Vaizki> I'll let them slag it out first :)
[22:23] <prog> from Leif: The "mass market" is difficult. People react on things they do not understand. It should be quite clear from my videos that the modifications I suggest only improve the NF by 0.1 dB which is negligible.
[22:26] <Vaizki> ok I don't any more info than that :)
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[22:26] <Vaizki> you saved me from watching 2 videos, thanks
[22:28] <prog> you can always watch them
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[22:33] <fsphil> prog: does the airspy work any better on the pi than the fcd?
[22:33] <Vaizki> naah I'll be having enough to do in learning this SDR stuff..
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[22:35] <prog> the pi has broken USB. it won't handle 10msps
[22:36] <fsphil> yea mostly a pi problem. I'm trying to stream iq data from it atm, but it breaks apart after about 120khz
[22:36] <prog> http://youtu.be/cAuNwE69jes?t=11m5s see how GND and the USB shield are isolated. This wasn't done randomly. connecting them adds a lot of noise on other setups.
[22:37] <fsphil> which makes sense, that's about 3.8mbit/s over the usb bus twice
[22:37] <prog> airspy needs 40MB/s
[22:37] <prog> 320mbit/s
[22:38] <fsphil> I'll stick with 96khz for now
[22:38] <fsphil> the bbb seems to have other problems
[22:39] <prog> as long as it works for you
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[22:46] <Maxell> Hmm, DUTCHHAB on the map? :)
[22:47] <Maxell> Would be PE1MEW I presume
[22:48] <KF5WYX> aprs.fi shows a telling tale of my afternoon.
[22:49] <KF5WYX> forgot I was beaconing when I stopped at p.terrys burger stand :-P
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[22:52] <Vaizki> fsphil: just out of interest, what problems with the bbb?
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[23:07] <fsphil> it kept crashing, though that wasn't while doing sdr stuff
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[00:00] --- Tue Jan 20 2015