highaltitude.log.20160409

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[00:31] <SpacenearUS> New vehicle on the map: 03kk4iaw_chase - 12http://tracker.habhub.org/#!qm=All&q=kk4iaw_chase
[00:34] <SpacenearUS> New vehicle on the map: 03Wesley_chase - 12http://tracker.habhub.org/#!qm=All&q=Wesley_chase
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[01:29] <SpacenearUS> New vehicle on the map: 03KK6ZXH-11 - 12http://tracker.habhub.org/#!qm=All&q=KK6ZXH-11
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[01:52] <Laurenceb_> https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=39537.0;attach=1109138
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[02:27] <SpacenearUS> New vehicle on the map: 03helo_chase - 12http://tracker.habhub.org/#!qm=All&q=helo_chase
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[04:40] <arko> sirus: ohai
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[04:46] <SpacenearUS> New vehicle on the map: 03DO2EIM-11 - 12http://tracker.habhub.org/#!qm=All&q=DO2EIM-11
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[06:34] <SpacenearUS> New position from 03test-BK after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=test-BK
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[07:06] <SpacenearUS> New vehicle on the map: 03haha_chase - 12http://tracker.habhub.org/#!qm=All&q=haha_chase
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[07:25] <SpacenearUS> New vehicle on the map: 03PYSY - 12http://tracker.habhub.org/#!qm=All&q=PYSY
[07:27] <SpacenearUS> New vehicle on the map: 03PYSYchase - 12http://tracker.habhub.org/#!qm=All&q=PYSYchase
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[07:52] <SM0ULC-R1b> morning!
[07:53] <fsphil> g'day!
[07:53] PE2G (~PE2G@2001:982:57a:1:2830:6abb:3466:9d13) joined #highaltitude.
[07:56] <PE2G> Morning.
[08:01] <SM0ULC-R1b> oh, pysy liftoff!
[08:02] <SM0ULC-R1b> or?
[08:04] <PE2G> Yes, seems te be ascending slowly
[08:04] <PE2G> *to be
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[09:10] <PE2BZ> Good morning all !
[09:10] <PE2BZ> !flights
[09:10] <SpacenearUS> 03PE2BZ: Current flights: 03PICO-23 144.251 MHz CTSTIA32/1000 10(ddfe), 03PYSY12b 10(e75c)
[09:10] <PE2BZ> !payload e75c
[09:10] <SpacenearUS> 03PE2BZ: Payload 03PYSYbme 10(e75c) 03$$PYSY - 03434.625 MHz USB 03RTTY 300/450Hz ASCII-7 none 2
[09:14] <SpacenearUS> New vehicle on the map: 03PYSYChase2_chase - 12http://tracker.habhub.org/#!qm=All&q=PYSYChase2_chase
[09:15] <SpacenearUS> New vehicle on the map: 03PYSY12b_chase - 12http://tracker.habhub.org/#!qm=All&q=PYSY12b_chase
[09:15] <PE2G> Good morning PE2BZ
[09:15] <PE2BZ> Good morning Frits. Did where does the PYSY go to today ?
[09:18] <PE2G> It will go to the northwest, but not far. Expected track is on the habhub tracker
[09:19] <PE2G> that is: on the habhub tracker site
[09:21] <PE2BZ> No signal over here yet.
[09:21] <PE2G> Here neither
[09:21] <PE2BZ> PE2G how do I only show the PYSY on the habmap ?
[09:23] <daveake> Type PYSY into the search box (top-left) and press Enter
[09:24] <fsphil> !track PYSY
[09:24] <SpacenearUS> 03fsphil: Here you go - 12http://tracker.habhub.org/#!qm=All&q=PYSY
[09:24] <fsphil> lazy method
[09:24] <daveake> :)
[09:25] <PE2BZ> daveake tnx, guess I am on the wrong habmap. (philcrump.co.uk) ?
[09:25] <PE2BZ> fsphil tnx to you too
[09:26] <daveake> http://habmap.philcrump.co.uk/?vehicles=PYSY
[09:27] <daveake> which you could have got by clicking on "Filter" next to the payload
[09:30] <PE2BZ> daveake thanks. Learning a lot every day. Now start to write things down and remember where ;-)
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[09:49] <PE2BZ> anyone (in EU) in need for a portapack for the hackrf ? My hackrfblue is broken on the USB side and I cannot replace a 200 pin processor.
[09:52] <DL7AD> PE2BZ: whats a portpack?
[09:53] <PE2BZ> A touchscreen and jog shuttle expansion board
[09:56] <arjunnaha> https://youtu.be/0NLv4dcM7eY
[09:59] <PE2BZ> arjunnaha nice movie !
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[10:14] <Ben-AstroSoc> morning
[10:14] <fsphil> o/
[10:19] <Ian_> morning Ben
[10:20] <Ian_> and all
[10:23] <PE2G> PYSY RTTY seems to be on 434.618
[10:24] <PE2G> Short RTTY bursts, hard to decode
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[10:40] <SpacenearUS> New position from 03DL1NBR-12 after 036 days silence - 12http://tracker.habhub.org/#!qm=All&q=DL1NBR-12
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[10:48] <DL7AD> hi tigger-gg
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[10:51] <tigger-gg> hi DL7AD
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[11:19] <SpacenearUS> New position from 03Legionowo after 0311 hours silence - 12http://tracker.habhub.org/#!qm=All&q=Legionowo
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[11:22] <SpacenearUS> New position from 03ZINOO4 after 0315 hours silence - 12http://tracker.habhub.org/#!qm=All&q=ZINOO4
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[11:38] <Ben-AstroSoc> oh crud I might know why I can't send any UART signals
[11:38] <Ben-AstroSoc> both UART Tx and Rx use UDR0 to send/receive data, right?
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[11:39] <jakeio> daveake, I'm currently working with the Pi Zero, could you tell me how to disable the getty login on serial, it appears /etc/inittab is gone.
[11:41] <Ben-AstroSoc> if the GPS is flooding the UDR0 register with data would it prevent me from being a ble to transmit?
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[11:44] <daveake> jakeio: raspi-config
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[11:45] <mfa298> Ben-AstroSoc: that may be dependant on how your code is written.
[11:48] <Ben-AstroSoc> from what I can tell it's largely identical to this https://ukhas.org.uk/guides:ublox6 although written for AVR, not arduino
[11:49] <jakeio> Thanks daveake.
[11:49] <mattbrejza> there are actually two UDR0 registers
[11:49] <Ben-AstroSoc> would it be worth disabling the transmit interrupt when listening and disabling the receive interrupt when I'm trying to transmit to it?
[11:49] <mattbrejza> when you read you read the rx one, when you write you write the tx one
[11:50] <mattbrejza> http://www.atmel.com/images/Atmel-8271-8-bit-AVR-Microcontroller-ATmega48A-48PA-88A-88PA-168A-168PA-328-328P_datasheet_Complete.pdf fig20-1
[11:50] <Ben-AstroSoc> I see, yeah
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[11:53] <mfa298> you may have issues if an interrupt handler gets called when you're already in another interrrupt handler
[11:53] <mattbrejza> itl queue interrupts so thats fine
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[11:53] <mfa298> I've had some issues where it seems to deadlock - although debugging that on an avr can be interesting
[11:54] <Ben-AstroSoc> from what I can tell I've setup the registers correctly
[11:54] <jakeio> How can I configure dl-fldigi for testing. Just sending random strings as tests?
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[12:06] <SpacenearUS> New position from 03SP6NVB-11 after 034 days silence - 12http://tracker.habhub.org/#!qm=All&q=SP6NVB-11
[12:06] <Ben-AstroSoc> i'm gonna solder up a serial cable that i can clip to the PCB and see if i can work out what's going on
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[12:15] <jakeio> Can anyone give me a spot of help getting used to dl-fldigi?
[12:18] <SpacenearUS> New vehicle on the map: 03EA3RKL-11 - 12http://tracker.habhub.org/#!qm=All&q=EA3RKL-11
[12:19] <SpacenearUS> New vehicle on the map: 03HB9HFJ-11 - 12http://tracker.habhub.org/#!qm=All&q=HB9HFJ-11
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[12:25] <mfa298> jakeio: there's some guides on the wiki that should get you started. After that you probably need to ask some specific questions
[12:27] <jakeio> Well, I've read the guides and they're a spot outdated, I need some guidance in setting up (and probably troubleshooting) the software as a simple tester, receiving strings from my transmitter.
[12:28] <jakeio> I've launched the software, configured my callsign, etc. set the audio device to be my FunCube dongle and set the frequency to 434650kHz.
[12:28] <jakeio> But I'm getting nothing but garbage.
[12:29] <jakeio> Could you perhaps explain the function of the waterfall mfa298?
[12:34] <mfa298> what sdr software are you running ?
[12:34] <SpacenearUS> New vehicle on the map: 03K1AMO - 12http://tracker.habhub.org/#!qm=All&q=K1AMO
[12:35] <mfa298> dl-fldigi doesn't talk to the funcube directly, you need something else to actually recieve the signal then pass it as audio to dl-fldigi
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[12:36] <jakeio> That'll be the problem. Can you recommend anything?
[12:36] <jakeio> I mean, the FunCube has nothing on their website just a statement "no drivers are required".
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[12:37] <jakeio> Which is helpful.
[12:37] <pb0ahx> HDSDR working very well
[12:37] <mfa298> sdr# and sdr-radio are the popular choices
[12:37] <daveake> hdsdr, sdr#
[12:37] <pb0ahx> !flights
[12:37] <SpacenearUS> 03pb0ahx: Current flights: 03PICO-23 144.251 MHz CTSTIA32/1000 10(ddfe), 03PYSY12b 10(e75c)
[12:38] <jakeio> Installing now.
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[12:39] <DL7AD> fsphil: did you receive the camera yet?
[12:41] <mfa298> you may also need to get something like vac (virtual audio cable) or vb-cable to route the audio from your sdr app to dl-fldigi
[12:42] <jakeio> I'm running HDSDR and I'm attempting to send something from my transmitter and very little is happening. I'm tuned to the correct frequency. Am I missing something?
[12:43] <prog> for more serious DSP, there's only one choice: SDR# ! (not being biased here ;))
[12:45] <Darkside> boooo
[12:45] <Darkside> sdr console 4 lyfe
[12:47] <jakeio> Damnit, must be something wrong with my transmitter.
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[12:48] <jakeio> Is there a way to test that HDSDR is working properly?
[12:48] <prog> moear aliases & less snr 4 ever
[12:48] <Darkside> sure, tune to something like a broadcast station
[12:48] <Darkside> prog: oh?
[12:49] <Darkside> prog: its using the same bits as SDR#, and has the same gain controls
[12:49] <Darkside> how is it going to end up with less SNR for, say, a SSB signal?
[12:49] <Darkside> by same bits i mean same input samples
[12:49] <prog> heh?
[12:49] <jakeio> Well, I've tuned it to a local radio station. Getting absolutely nothing through.
[12:49] <prog> wait we have a name for that... Dunning-Kruger effect!
[12:50] <prog> not all DSP's are born equal ;)
[12:50] <prog> "but they all do number crunching!"
[12:50] <prog> heh. eat shit!
[12:50] <Darkside> i'll have to do some A/B tests then
[12:50] <Darkside> jakeio: ok then something is not right
[12:50] <Darkside> jakeio: go try another bit of software
[12:50] <Darkside> like SDR# or SDR console on windows
[12:51] <mfa298> jakeio: you may need to configure hdsdr to work with your fcd then make it start sampling
[12:51] <Darkside> just to check its not the software
[12:51] <Darkside> oh wait, FCD?
[12:51] <jakeio> FCD?
[12:51] <jakeio> FunCube.
[12:51] <jakeio> Yes.
[12:51] <Darkside> yeah
[12:51] <Darkside> funcube dongle :-)
[12:51] <Darkside> pro plus i guess
[12:51] <prog> Darkside: if you don't know what to look for, you won't find anything.
[12:51] <jakeio> Indeed.
[12:51] <jakeio> prog, very philosophical.
[12:51] <Darkside> prog: well i mean i can fairly easily look at the SNR of a known modem signal
[12:52] <Darkside> as seen using the SSB demod output
[12:52] <prog> in what conditions?
[12:52] <Darkside> i have a few things i can test with
[12:52] <mfa298> I think last time I tried sdr# on my netbook it wasn't useable as half the control were off screen.
[12:52] <Darkside> one is just with added noise from a broadband noise generator, variable attenuator, and then a combiner
[12:52] <SpacenearUS> New vehicle on the map: 03K0SCC-11 - 12http://tracker.habhub.org/#!qm=All&q=K0SCC-11
[12:52] <Darkside> the other is where i use a combiner to combine in noise from an outside antenna with the test signal
[12:53] <prog> if t's just about SNR, the IF noise reduction has no match in the SDR offerings as of today
[12:53] <SpacenearUS> New vehicle on the map: 03AE0SS-13 - 12http://tracker.habhub.org/#!qm=All&q=AE0SS-13
[12:53] <prog> but there are more parameters involved: spurs and aliases
[12:54] <Darkside> but isnt a lo tof that a function of tuner parameters?
[12:54] <Darkside> (I'd be running this test with an airspy btw)
[12:55] <Darkside> my last RTLSDR is now in a box waiting to go up to a remote site and be a websdr
[12:55] <jakeio> Darkside, just launching SR Console.
[12:55] <Darkside> jakeio: so you have the funcube dongle appearing as an audio device?
[12:56] <jakeio> I can hear noise.
[12:56] <Darkside> jakeio: SDR# is probably going to be easier to use
[12:56] <jakeio> OK, it's working.
[12:57] <Darkside> SDR console is nice if you want multiple VFOs, rig tracking and a really pretty full-screen waterfall
[12:57] <prog> when using airpsy some sdr# features are enabled
[12:57] <Darkside> SDR# is probably better for just demodulating balloon telemetry
[12:57] <jakeio> I shall look into SDR# then.
[12:57] <Darkside> prog: oh?
[12:57] <jakeio> As it's been recommended a lot now!
[12:57] <jakeio> How can I set frequency in SDR Console.
[12:57] <Darkside> prog: so this noise reduction stuff, is this more targeted at RTLSDRs and stuff?
[12:57] <Darkside> jakeio: just go install SDR#
[12:57] <Darkside> it'll be a bit easier initially
[12:57] <prog> man we designed both, you can expect the best performance when both are combined...
[12:58] <jakeio> Done!
[12:58] <Darkside> for most of what i've been using the airspy for, i've not been using any of those programs at all
[12:58] <Darkside> i've been using airspy_rx and csdr
[12:59] <prog> here's a trick: use the IF and AF noise reduction plugins
[12:59] <prog> they have special noise profiles for airspy
[12:59] <Darkside> whats that going to do to a broadband modem signal though?
[12:59] <prog> more SNR?
[12:59] <Darkside> oh?
[12:59] <Darkside> i thought noise reduction generally does bad things to modem signals
[12:59] <prog> that's LPS
[12:59] <prog> LMS
[13:00] <prog> we don't use LMS
[13:00] <Darkside> (or spectral, ceptral, whatever)
[13:00] <Darkside> cepstral*
[13:00] <prog> give it a try
[13:00] <Darkside> will do
[13:00] <Darkside> well
[13:00] <prog> chose "Custom"
[13:00] <Darkside> actually it wont help with the modem i'm working on
[13:01] <Darkside> as im not sure SDR# can output the ultra wideband real-valued samples this modem needs
[13:01] <Darkside> signal is about 200khz wide
[13:01] <jakeio> ok. I'm on SDR# and I've tuned it to 434.650MHz, currently hearing a typical wind sound.
[13:02] <Darkside> jakeio: so set it to USB mode
[13:02] <jakeio> Done
[13:02] <Darkside> thats 'uper sideband'
[13:02] <Darkside> upper*
[13:02] <Darkside> anyway
[13:02] <jakeio> OK.
[13:02] <Darkside> your TX Is on?
[13:02] <Darkside> do you see any strong signals in the waterfall diplay?
[13:02] <jakeio> Not at all.
[13:02] <prog> may be not relevant, but here's the effect on an SSTV signal https://twitter.com/w9ran/status/716648285126000640
[13:02] <jakeio> It's on 434.650.
[13:02] <prog> (sstv sent over NFM)
[13:03] <Darkside> prog: bah
[13:03] <jakeio> There is a tiny peak there Darkside .
[13:03] <jakeio> But It's minute.
[13:03] <Darkside> so to be sure, try turning your transmitter on and off
[13:03] <Darkside> that'll tell you if its the signal or not
[13:03] <Darkside> prog: SSTV over FM is kind of silly
[13:03] <jakeio> Right, just to confirm, with the NTX2B, having 3.3v going into the EN pin makes it on?
[13:04] <Darkside> jakeio: uhmmm i think so? hhaven't used a 2B
[13:04] <Darkside> sounds right though
[13:04] <mfa298> jakeio: should be
[13:04] <prog> Darkside: brazilian pirates like NFM
[13:05] <Darkside> prog: anyway, this is what i've been working on http://www.rowetel.com/blog/?p=5080
[13:06] <Darkside> my aim at the moment is to get my receive systems noise figure as low as possible
[13:06] <Darkside> so preamp right next to the antenna
[13:06] <prog> something is wrong in your measurements
[13:06] <Darkside> the noise figure ones?
[13:06] <prog> did you use the linearity gain?
[13:06] <Darkside> sensitivity gain
[13:07] <Darkside> should we have used the linearity gain?
[13:07] <prog> why would you use the sensitivity gain with a preamp
[13:07] <Darkside> the noise igure measurements are only going to be accurate to maybe 1.5dB anyway
[13:07] <Darkside> i can try again with linearity gain
[13:08] <prog> the NF of the preamp is dominant and should be about the same on all devices
[13:08] <Darkside> no wait, the 1.8db fiure was measuring the preamp using a specan
[13:08] <Darkside> 1.5*
[13:08] <Darkside> the preamp is specced at 0.75dB NF
[13:08] <Darkside> PSA4-5043+
[13:09] <Darkside> wait, 0.6dB
[13:09] <Darkside> whatever, lower than i can accurately measure anyway
[13:09] <SpacenearUS> New vehicle on the map: 03KC0UUO-11 - 12http://tracker.habhub.org/#!qm=All&q=KC0UUO-11
[13:09] <prog> airspy_rx -f440.0 -r /dev/stdout -a 1 -h 21 <- no gain?
[13:10] <Darkside> eh?
[13:10] <prog> I mean no linearity gain
[13:10] <Darkside> thats sensitivity gain 21 right?
[13:11] <prog> yes
[13:11] <Darkside> so what setting should we be using for lowest NF with and without an external preamp?
[13:11] <prog> maybe too much after a preamp
[13:12] <prog> what's the gain of the preamp ?
[13:12] <Darkside> 19dB
[13:12] <prog> use linearity around 18
[13:12] <prog> without preamp, sensitivity at max
[13:13] <Darkside> we expect signal levels to be around -100 to -110 dBm
[13:13] <Darkside> ok
[13:13] <Darkside> will give that a go when i have access to test equipment again
[13:13] <Darkside> hrm
[13:13] <Darkside> actually i could probably go borrow a N5181B right now...
[13:13] <fsphil> DL7AD: no sign of it
[13:13] <prog> did you normalize to the same sample rate?
[13:14] <Darkside> actually probably shouldnt
[13:14] <Darkside> prog: you'll have to ask david that one, it was his code
[13:14] <prog> daveake: ping
[13:14] <Darkside> not that david
[13:14] <jakeio> Just restarted the pi, still nothing.
[13:14] <daveake> ha
[13:14] <Darkside> http://www.rowetel.com/blog/?p=5057
[13:14] <Darkside> its on that blog post
[13:15] <prog> daveake: sorry, wrong david
[13:15] <jakeio> daveake, as you're here, can I pester you with a few questions?
[13:15] <daveake> sure
[13:15] <Darkside> prog: http://svn.code.sf.net/p/freetel/code/codec2-dev/octave/nf_from_gr.m
[13:15] <jakeio> OK, so, I've got an NTX2B setup and it's Vcc is connected to the Pi's 5v, it's GND is to pi's GND, the Pi's Tx goes via a potential divider to the Tx pin.
[13:15] <jakeio> And the 5v also goes to the EN.
[13:16] <jakeio> However, it's not transmiting.
[13:16] <daveake> ok
[13:16] <jakeio> Anything.
[13:16] <daveake> I bet it is
[13:16] <Darkside> prog: want to move this chat to the airspy channel?
[13:16] <jakeio> I've got SDR# and nada is showing up.
[13:16] <jakeio> Sorry Darkside, I should really use PM for this.
[13:16] <daveake> The NTX2B is very simple. If it has power and the enable signal is high, then it transmits
[13:17] <jakeio> OK, is there any reason the Pi would not output it's 5V?
[13:17] <prog> Darkside: as it turned too technical, yes please
[13:17] <jakeio> (Unless it's off!)
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[13:17] <daveake> No, if the Pi is on then the 5V GPIO pin will have ~5V on it
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[13:18] <jakeio> OK. So, could it, perhaps, be my shoddy soldering?
[13:18] <daveake> could be, or you have connected to the wrong pins, or the entire assumption that it isn't transmitting is false
[13:19] <jakeio> OK. How can I be sure it's not transmitting?
[13:19] <daveake> set up and run the receiving software, ofc
[13:20] <jakeio> I've got the receiving software on. I'm receiving absolutely nothing. No peak at 434.650.
[13:20] <daveake> be sure you've selected the device you're using, that the ntx2b frequency is within the waterfall
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[13:20] <jakeio> I've selected the FUNcube Dongle Pro+ in SDR#
[13:21] <jakeio> How do you mean that the ntx2b is within the waterfall?
[13:21] <SpacenearUS> New vehicle on the map: 03AE0SS-12 - 12http://tracker.habhub.org/#!qm=All&q=AE0SS-12
[13:21] <daveake> got a multimeter?
[13:21] <jakeio> Ah, that's something I'm waiting on.
[13:21] <daveake> I mean that the waterfall frequency range includes whatever frequency the ntx2b is set to
[13:21] <jakeio> It definitely does.
[13:21] <daveake> which will be whatever it says on the case
[13:22] <jakeio> 434.650, definitely in the range.
[13:23] <SpacenearUS> New vehicle on the map: 03KC0D-11 - 12http://tracker.habhub.org/#!qm=All&q=KC0D-11
[13:23] <daveake> it's your wiring or your use of the sdr s/w; chances of it being the ntx2b are close to zero
[13:24] <jakeio> Hmm.
[13:24] <jakeio> Here's a screen grab of SDR#
[13:24] <jakeio> http://imgur.com/zxl2pye
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[13:24] <daveake> this btw isn't a pi-specific thing, so best to ask everyone rather than 1 person
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[13:25] <daveake> Does the ntx2b say 434.650 on it ?
[13:25] <jakeio> It does.
[13:25] <jakeio> Definitely.
[13:26] <daveake> ok, interesting choice
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[13:26] <jakeio> That's ominous.
[13:26] <fsphil> most likely no power to ntx2b or en pin
[13:26] <Ian_> Could you repeat that please . . . :)
[13:27] <jakeio> Ian_, me?
[13:27] <jakeio> Or does someone else need to repeat stuff? :D
[13:27] <Ian_> Sorry jakeio, it was a joke for daveake
[13:27] <jakeio> Np!
[13:27] <Ian_> Regarding choice of frequency
[13:27] <jakeio> Oh.
[13:27] <craag> jakeio: Have you measured the voltage between the '0V' and 'VCC' pins on the ntx2?
[13:28] <jakeio> craag, I have no multimeter (yet).
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[13:28] <fsphil> have you got a picture of your setup?
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[13:28] <jakeio> fsphil, I can provide one.
[13:29] <jakeio> How much detail do you need?
[13:29] <fsphil> just to see how the ntx2 is wired up
[13:29] <daveake> enough to spot the error, probably
[13:29] <jakeio> It's messy.
[13:29] <jakeio> I warn you.
[13:29] <fsphil> possibly related :)
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[13:30] <jakeio> Haha, possibly? You mean certainly.
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[13:31] Nick change: bertrik_ -> bertrik
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[13:31] <fsphil> it's all going to be just guessing until you get the multimeter anyway
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[13:32] <jakeio> I suppose.
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[13:34] <daveake> The ntx2b just needs 3 wires to get it transmitting (and 2 of those are the same), so it's easily tested
[13:34] <jakeio> http://imgur.com/Xmagnid,fdkJOTk,eoIwR9h,i9xVhn2,1H7lSxa
[13:34] <daveake> Just a pp3 battery + to Vcc/En, - to GND
[13:34] <jakeio> Not very clear, I know.
[13:35] <jakeio> I'm no photographer.
[13:35] <jakeio> And it's horrendously messy.
[13:35] <jakeio> Again, I know.
[13:35] <daveake> Oh the problem is clear
[13:35] <jakeio> :D
[13:35] <daveake> You're upside down
[13:35] <jakeio> What?
[13:36] <craag> Turn the diagram for the pi gpio 180 degrees ;)
[13:36] <jakeio> Really?! What!??!? I was so careful to check that!!!!!
[13:36] <daveake> http://301o583r8shhildde3s0vcnh.wpengine.netdna-cdn.com/wp-content/uploads/2015/04/Raspberry-Pi-GPIO-compressed.jpg
[13:37] <jakeio> I even have the RasPIO header layout.
[13:37] <jakeio> And I did that!
[13:37] <jakeio> Oh dear.
[13:37] <jakeio> I have the ruler with the layout.
[13:37] <jakeio> I must've rotated it when I plugged it in.
[13:37] <jakeio> Shoot.
[13:37] <jakeio> Well, thanks.
[13:37] <daveake> np come back later :)
[13:37] <jakeio> Now, if there was ever a stupid mistake to make...
[13:37] <craag> hah not the worst dave has seen..
[13:37] <fsphil> still get the multimeter :p
[13:37] <daveake> hah no
[13:37] <jakeio> fsphil, literally on the way!
[13:38] <Ben-AstroSoc> is there a reason why the GPS wouldn't return position data even after getting a lock?
[13:38] <fsphil> nice. it's one of lives essentials :)
[13:38] <Ben-AstroSoc> I've got gps time but no long/lat
[13:38] <SpacenearUS> New vehicle on the map: 03KE0BMV-11 - 12http://tracker.habhub.org/#!qm=All&q=KE0BMV-11
[13:38] <fsphil> lifes*
[13:38] <Ben-AstroSoc> nvm, it's just showed up
[13:38] <fsphil> it usually gets time first
[13:38] <fsphil> just means it's locked on to at least one satellite
[13:38] <Ben-AstroSoc> ok, i know my module is working
[13:39] <daveake> yeah, time but no lat/long just means not locked yet, or not enough signal
[13:39] <Ben-AstroSoc> i tried sending the flight mode signal to it through my terminal and it didn't appear to work
[13:39] <Ben-AstroSoc> will it still work if you send the initialise code to it right after you enable it? or is that asking for trouble
[13:40] <jakeio> Just send "oranges" with my basic RTTY sender.
[13:40] <jakeio> And I heard a faint BEEP BEEP BEEP!
[13:40] <jakeio> So pleasing.
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[13:40] <fsphil> shouldn't be that faint
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[13:41] <jakeio> I turned down the volume (because constant white noise is enough to drive a man insane).
[13:42] <fsphil> oh the rtty will too
[13:43] <jakeio> Haha. Thanks!
[13:43] <Ben-AstroSoc> does anyone mind if i stick the code i'm working on up here so you can see if I've missed something obvious?
[13:43] <fsphil> pastebin
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[13:44] <Ben-AstroSoc> http://pastebin.com/eR0cHr9e
[13:44] <jakeio> Can anyone explain the numerous peaks as soon as the radio's on? http://i.imgur.com/DoVYNAJ.jpg
[13:45] <Darkside> overload
[13:45] <fsphil> very ^
[13:45] <Darkside> move th etransmitter away
[13:45] <jakeio> What?
[13:45] <jakeio> OK.
[13:45] <Darkside> or just unplug the receivers antenna
[13:45] <Darkside> jakeio: very strong signal, causing the ADC in the receiver to clip
[13:46] <Darkside> or saturate in some other nasty way
[13:46] <jakeio> Removed the arial.
[13:46] <jakeio> Lovely.
[13:46] <jakeio> Thanks again!
[13:46] <Darkside> obviously dont do that in the actual flight :P
[13:46] <fsphil> lol
[13:46] <Darkside> but its on when the tx is just across the table
[13:50] <jakeio> Is this the software you meant earlier mfa298 http://software.muzychenko.net/eng/vac.htm when you talked about Virtual Audio Cable (VAC)?
[13:51] <jakeio> Does anyone know an equivalent for linux (specifically ubuntu)?
[13:51] <fsphil> you already have it, pulseaudio
[13:51] <Darkside> yep
[13:51] <jakeio> Ah, OK.
[13:52] <fsphil> running pavucontrol will give you a list of programs currently recording audio in one of the tabs
[13:52] <mfa298> jakeio: that or http://vb-audio.pagesperso-orange.fr/Cable/
[13:52] <fsphil> and you can select which source it records from, including the output of your sound card
[13:52] <russss> is anyone working on direct SDR input to fldigi yet? feels like they should get with the times.
[13:52] <mfa298> vb-cable is free but possibly a bit more limited, VAC you have to pay for but has more options
[13:53] <fsphil> russss: current devel branch has udp input that works with gqrx's udp output
[13:53] <russss> getting closer
[13:53] <fsphil> trouble is the current fldigi branch has an awful rtty modem
[13:53] <mfa298> russss: I think people have suggested it might be easier starting from scratch
[13:53] <Geoff-G8DHE-M> fldigi is only a MODEM not a radio receiver, it handles the audio output.
[13:53] <russss> mfa298: I have considered it
[13:54] <Ben-AstroSoc> mmh if i can't solve this in the next hour or two I'm gonna write it out so at least we pass the module, then come back to it later
[13:54] <jakeio> Is SDR# available on linux?
[13:54] <jakeio> I can't find it, it appears.
[13:54] <russss> jakeio: if you're on linux, try gqrx
[13:54] <russss> it does the same job.
[13:54] <Darkside> fsphil: there may end up being a plugin for the freedv app with uses drowe's fsk modem
[13:54] <mfa298> jakeio: on linux people use gqrx (or for a bigger learnign curve look at gnuradio)
[13:54] <SpacenearUS> New vehicle on the map: 03EOS_T2 - 12http://tracker.habhub.org/#!qm=All&q=EOS_T2
[13:55] <Darkside> fsphil: or someone else can write a GUI wrapper around it...
[13:55] <Darkside> fsphil: it definitely performs better than fldigi does
[13:55] <russss> in theory you should be able to demodulate better from a complex input anyway. Tuning/band selection is the issue.
[13:55] <fsphil> how does it handle the slower speeds like 50 bps?
[13:56] <russss> what would be great is something which sucks in the entire band and demodulates any RTTY it sees
[13:56] <Darkside> fsphil: just fine, we've used it on a flight before
[13:56] <russss> then I can just slap that on a RPi and leave it
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[14:00] <Ben-AstroSoc> oh
[14:00] <Ben-AstroSoc> shiiiiiiit
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[14:00] <Ben-AstroSoc> i think i know why it's not working
[14:01] <SpacenearUS> New vehicle on the map: 03KD5GOM-11 - 12http://tracker.habhub.org/#!qm=All&q=KD5GOM-11
[14:04] <SpacenearUS> New vehicle on the map: 03KD0HIP-7 - 12http://tracker.habhub.org/#!qm=All&q=KD0HIP-7
[14:05] <fsphil> you're doing too much in your interrupt
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[14:06] <fsphil> line 324 will not do what you're expecting it to
[14:06] <fsphil> oh n/m, I read it wrong
[14:06] Action: fsphil needs glasses
[14:07] <Ben-AstroSoc> i wonder if like 161 is the reason i'm not transmitting any UART
[14:07] <fsphil> heh, missed that
[14:07] <Ben-AstroSoc> in the version you'r elooking at the line UDR0 = ch; is wrapped in the while loop
[14:08] <Ben-AstroSoc> i swapped it to a while statement, i think that was why it wasn't transmitting?
[14:08] <fsphil> yep that's wrong
[14:09] <fsphil> the while() loop should have no code inside
[14:09] <fsphil> it's suppose to block until the condition becomes false
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[14:09] <fsphil> (ideally you'd want a timeout there, but not important for now)
[14:09] <Ben-AstroSoc> void GPS_TxChar(uint8_t ch) {
[14:09] <Ben-AstroSoc> while(!(UCSR0A &1<<UDRE0)); //check to see if Tx buffer is clear
[14:09] <Ben-AstroSoc> UDR0 = ch; //write char to buffer
[14:09] <Ben-AstroSoc> }
[14:09] <Ben-AstroSoc> this is it now
[14:09] <Ben-AstroSoc> oops, meant to pastebin that
[14:10] <fsphil> I'd put () around your 1 << UDRE0
[14:10] <fsphil> just makes things a bit clearer
[14:10] <jakeio> Can anyone give me a hand setting up PulseAudio?
[14:11] <Ben-AstroSoc> done that
[14:11] <fsphil> you're setting up gps with 2 stop bits, is that right?
[14:11] <Ben-AstroSoc> yeah, is that wrong?
[14:11] <fsphil> can't remember now...
[14:11] <fsphil> fairly sure it's 8-bit, no parity, 1 stop bit
[14:12] <fsphil> might not matter, lots of uarts will handle either
[14:12] <SpacenearUS> New vehicle on the map: 03KM4RGO-1 - 12http://tracker.habhub.org/#!qm=All&q=KM4RGO-1
[14:12] <mfa298> you should also be able to replace (1<<UDRE0) with _BV(UDRE0)
[14:13] <mfa298> although that's probably down to personal preference as to what you find most readable
[14:13] <Ben-AstroSoc> i'd've thought if this code works it'd jump into the right mode almost instantly
[14:13] <Ben-AstroSoc> i'm just connecting my serial cable back up
[14:15] <Ben-AstroSoc> ok it's now transmitting the setup bits almost as soon as it turns on
[14:15] <Ben-AstroSoc> so i know that works
[14:16] <Ben-AstroSoc> which means either the GPS isn't receiving it properly or I'm not decoding the response properly
[14:18] <fsphil> the way you are reading any potential ack is probably being upset by the normal gps text data
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[14:19] <Ben-AstroSoc> it shouldn't be listening for a certain ack before it hears the airborne mode confirm though
[14:19] <fsphil> the gps will be sending nmea data
[14:20] <Ben-AstroSoc> you mean it's flooding the UART?
[14:21] <fsphil> you don't seem to be taking it into account. looks like you expect only the ACK and nothing else
[14:21] <Ben-AstroSoc> about 10 lines into the NMEA it sends another $GNTXT line with a new status so maybe it's worked but i'm not confirming it
[14:21] <Ben-AstroSoc> https://usercontent.irccloud-cdn.com/file/beMoB8s0/SCREENSHOT.PNG
[14:22] <fsphil> if I'm reading it right, the code is expecting the very first byte after sending your ubx packet to be the start of the ack
[14:22] <Ben-AstroSoc> yeah, tha'ts right
[14:22] <Ben-AstroSoc> whcih now you say that back to me sounds unrealistic
[14:22] <fsphil> but it might still be half way through sending a nmea line
[14:23] <fsphil> you need to wait for the first 0xB5 (but not forever)
[14:24] <Ben-AstroSoc> right
[14:24] <Ben-AstroSoc> in that screenshot would that GNTXT line about 2/3 of the way down be the confirmation?
[14:25] <fsphil> it should only response with a ubx packet
[14:26] <Ben-AstroSoc> doesn't look like i'm seeing the response at all then
[14:26] <fsphil> yeah I'd expect some garbage text there
[14:27] <Ben-AstroSoc> how long does it normally take to initialise into the new mode?
[14:27] <Ben-AstroSoc> ie is it instant?
[14:27] <fsphil> should response pretty much right away
[14:28] <fsphil> where did you get the setdm6 magic numbers?
[14:28] <Ben-AstroSoc> http://ava.upuaut.net/?p=750 this
[14:29] <fsphil> Upu: gps_set_sucess :)
[14:30] <fsphil> are you able to monitor your uart's output to the gps?
[14:30] <Ben-AstroSoc> yep
[14:30] <Ben-AstroSoc> albeit not both at the same time
[14:30] <fsphil> worth checking it's even sending anything
[14:31] <Ben-AstroSoc> https://usercontent.irccloud-cdn.com/file/NHVSFCbu/SCREENSHOT.PNG
[14:32] <Ben-AstroSoc> the stuff on teh 4th line was as i turned the power off but the bytes are there
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[14:32] <fsphil> huh, looks fine. did you go back to 1 stop bit?
[14:32] <Ben-AstroSoc> yep
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[14:34] <SpacenearUS> New vehicle on the map: 03KK4NIV-1 - 12http://tracker.habhub.org/#!qm=All&q=KK4NIV-1
[14:34] <fsphil> have you fixed it to wait for the first byte of the packet?
[14:34] <Ben-AstroSoc> not yet
[14:35] <fsphil> try a delay before you first try sending it, you should at least see the response
[14:35] <Ben-AstroSoc> ok, 2s
[14:37] <jakeio> I've got the sound from Gqrx going to dl-fldigi. Now, what next! At present the waterfall is consistent with what the sound is doing. But nothing is being decoded.
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[14:39] <jakeio> Now just garbage is being decoded.
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[14:42] <Ben-AstroSoc> right writtne in a check
[14:43] <jakeio> It's configured as RTTY-50, so I assume that's 50 baud RTTY, can anyone give some advice?
[14:45] <Ben-AstroSoc> still nothing so going to write a delay in and see what happens
[14:49] <jakeio> IT WORKS! Sorry, I'll be quiet now :D
[14:49] <Ben-AstroSoc> i'm sending the packet after a 2s delay but nothing from the GPS
[14:50] <Ben-AstroSoc> pure NMEA
[14:50] <SpacenearUS> New vehicle on the map: 03KD0NMG-11 - 12http://tracker.habhub.org/#!qm=All&q=KD0NMG-11
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[14:54] <Ben-AstroSoc> still no response -.-
[14:55] <Ben-AstroSoc> it doesn't have to have a lock for this to work does it?
[14:56] <SpacenearUS> New position from 03KM4GXU-14 after 037 days silence - 12http://tracker.habhub.org/#!qm=All&q=KM4GXU-14
[15:00] <fsphil> nah it should always ack/nak a valid ubx packet
[15:00] <Ben-AstroSoc> something weird is going on then
[15:03] <fsphil> yeah. it looks like the avr is sending it ok
[15:03] <fsphil> the ublox is either not receiving it, or the packet is invalid
[15:04] <SpacenearUS> New vehicle on the map: 03W0ISU-9 - 12http://tracker.habhub.org/#!qm=All&q=W0ISU-9
[15:04] <Ben-AstroSoc> wouldn't it send a NACK if it was an invalid packet
[15:04] <Ben-AstroSoc> or is that not how it works
[15:06] <Ben-AstroSoc> right the chip is definitely getting the packet, i've just put the serial cable as close as I can get to it
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[15:09] <Ben-AstroSoc> https://www2.u-blox.com/images/downloads/Product_Docs/u-bloxM8_ReceiverDescriptionProtocolSpec_%28UBX-13003221%29_Public.pdf page 145 here is what i'm assuming is what tells me the exact packet i need to send
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[15:13] <Ben-AstroSoc> although the packet I'm sending seems much larger than what itlooks like you need to set dm6
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[15:17] <fsphil> seems to match my old code. 36 payload bytes, 8 bytes overhead
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[15:19] <Ben-AstroSoc> https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_%28UBX-13003221%29_Public.pdf page 132 the protocol doesn't seemto have changed
[15:20] <Ben-AstroSoc> samem doc page 171
[15:22] <Ben-AstroSoc> i'm not gonna pretend I understand how to derive the exact packet I need but it seems like it's identical to what we've already tried
[15:22] <SpacenearUS> New vehicle on the map: 03K5ARB-11 - 12http://tracker.habhub.org/#!qm=All&q=K5ARB-11
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[15:29] <Ben-AstroSoc> could the chip be expecting a differnet baud rate or something?
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[15:37] <fsphil> don't think so
[15:37] <fsphil> definitly got it wired to the right pin? :)
[15:37] <Ben-AstroSoc> yep
[15:38] <Ben-AstroSoc> https://forum.arduino.cc/index.php?topic=232896.0 just read this
[15:38] <Ben-AstroSoc> might be wrong checksum calc?
[15:38] <Ben-AstroSoc> comment #10
[15:43] <jakeio> How do you put the Ublox m8q into flight mode?
[15:43] <Ben-AstroSoc> i have no idea at this point
[15:43] <Ben-AstroSoc> changing the checksum calc didn't fix it
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[15:45] <Jordan_> Hello! Is anybody here?
[15:45] <arjunnaha> Hello!
[15:46] <jakeio> Hello!
[15:46] <Jordan_> Hi! Pleased to get a reply! I'm wondering if someone can help me with the HAB Tracker app...
[15:47] <arjunnaha> iOS or Android?
[15:48] <Jordan_> I've downloaded it from the Google Play store, opened it up, and it said I need to download a map, so I clicked on the link, selected Britain, downloaded it just fine. The app then asks me....
[15:49] <Jordan_> To select the file, which is in root/SDcard/Download, but the app's file explorer doesn't show it there!
[15:49] <daveake> You need to rename the downloaded file as <whatever it is>.map
[15:50] <Jordan_> Oh, OK. Let me try that just now
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[15:52] <Ben-AstroSoc> could be a case of an out of date packet format but i can't for the life of me work out how to build it from the datasheet
[15:53] <jakeio> daveake, do you know how to put a Ublox m8q into flight mode? I can find little when using ctrl+f on the datasheet (databooklet).
[15:53] <daveake> Yes. Read the manual. :)
[15:53] <jakeio> Time for some fun!
[15:53] <daveake> There's some sample code in the ukhas wiki
[15:54] <Jordan_> Thanks :D
[15:54] <Ben-AstroSoc> https://ukhas.org.uk/guides:ublox6
[15:54] <daveake> However, you should always look these things up in the manual for your device
[15:54] <Ben-AstroSoc> need to confirm that the packet is correct
[15:54] <Ben-AstroSoc> becuase I'm not getting a response
[15:54] <daveake> a) 'cos your device may differ, and b) because you shouldn't rely on what someone else on the internet says anyway :)
[15:55] <mfa298> people on the internet have been known to be wrong
[15:55] <daveake> You should get a response. I don't recall if it's just an ACK packet or a full packet, but you should get something
[15:55] <jakeio> daveake, well, I did consult the manual and found no mention of any flight mode. But I'll have a more thorough look. Is it definitely called flight mode?
[15:56] <Ben-AstroSoc> i've confirmed it's sending the exact packet on that UKHAS page and i get nothing back
[15:56] <Ben-AstroSoc> it's under airborne mode
[15:56] <daveake> Search for "nav mode" or "navigation mode", I hink
[15:56] <daveake> t
[15:56] <Ben-AstroSoc> i searched airborne and went straight to it, nav mode too
[15:56] <fsphil> at this point I would just start with the simplest possible code
[15:57] <fsphil> no interrupts
[15:57] <Ben-AstroSoc> i don't see how it's a code issue at this point though, if we confirmed it's sending hte paket to the gps and we can see the entire output form the gps
[15:57] <fsphil> just sends a ubx packet, reads one back. blinks an LED
[15:57] <Ben-AstroSoc> doesn't that eliminate a code issue?
[15:58] <fsphil> well it eliminates both hardware and software :) so it can't be right
[15:59] <fsphil> the only thing I can think of that would let you see data from the gps, send it but get no ack, is the avr tx > gps rx not wired correctly
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[16:01] <fsphil> or damaged IC. but that's unlikely
[16:01] <Ben-AstroSoc> i read the packets off of the header pins on the GPS breakout board
[16:01] <Ben-AstroSoc> so if it's a wiring issue its on the breakout
[16:04] <daveake> So you see incoming nmea but it's not responding to packets you send to it ?
[16:04] <Ben-AstroSoc> yeah
[16:04] <daveake> serial or i2c ?
[16:04] <Ben-AstroSoc> serial
[16:04] <daveake> 8 bits ?
[16:04] <Ben-AstroSoc> yep
[16:04] <Ben-AstroSoc> 1 stop
[16:05] <daveake> Make a simple program like fsphil said
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[16:19] <Clarkey> Hello! Total noob here. Just reading https://ukhas.org.uk/guides:tracking_guide and it seems to suggest that we could use an SDR dongle, or a FunCube Dongle Pro+, instead of a relatively expensive (traditional?) radio receiver. However, when I click on the page for the SDR dongle, it says that they shouldn't be used for actual flights, only 'bench-testing'. Can anyone explain?
[16:20] <mfa298> I think that statement is aimed mostly at the rtlsdr dongles as they can suffer with strong nearby signals
[16:20] <mfa298> they're also not as sensitive as other receivers
[16:23] <Clarkey> Apologies for being so uneducated, but, do you know if something like this would be OK? http://www.dx.com/p/rtl2832u-r820t-mini-dvb-t-dab-fm-usb-digital-tv-dongle-black-170541#.VwksT9R4WrU
[16:24] <russss> there is no reason why you shouldn't buy one of those, they are very handy. They may not be as good as a proper radio for long-range tracking though.
[16:25] <mfa298> most people here have at least one rtlsdr dongle as they're cheap and useful
[16:25] <russss> I have, I think, seven.
[16:25] <fsphil> nice. four here
[16:26] <pb0ahx> 3 here
[16:26] <russss> I have three with a splitter in the system which is going on my roof
[16:26] <mfa298> I tihnk i've bought 6, but given at least one away
[16:27] <SA6BSS-Mike|2> 7 of them :)
[16:27] <SA6BSS-Mike|2> I have tracked over balloons over 600km away with a rtl
[16:28] <SA6BSS-Mike|2> so the do work quite well
[16:28] <russss> yeah, hook it up to a good antenna and you're fine IMO. Don't use the provided one.
[16:28] <russss> perhaps filter + preamp if you're getting very fancy. Still cheaper than a FT-817
[16:29] <LazyLeopard> a good antenna and something like a HAB-amp pre-amp/filter will make a lot of difference.
[16:29] <SA6BSS-Mike|2> +1
[16:30] <mfa298> I suspect the filtering (or lack of) has been a bigger issue for some people. a strong signal somewhere else in the spectrum will stop you hearing habs
[16:30] <Clarkey> Cool. Thanks for the advice. Can you recommend a receiver?
[16:30] Nick change: SA6BSS-Mike|2 -> SA6BSS-Mike
[16:31] <SpacenearUS> New vehicle on the map: 03KM4SDX-11 - 12http://tracker.habhub.org/#!qm=All&q=KM4SDX-11
[16:31] <SA6BSS-Mike> if u going with a rtl go withg the rt-blog one its 20-25 dol
[16:31] <mfa298> that really depends on budget and what you want it to do.
[16:31] <jakeio> I've just been reading the datasheet for my particular GPS module (Ublox Max m8q) and I've found mention of an airborne mode, however, there appears to be no description of how to format the input! Very thrustrating, has anyone used the Ublox Max M8Q before, if so, can you help me?
[16:31] <SA6BSS-Mike> if u want a step up go with asdplay or airspy
[16:31] <SA6BSS-Mike> *sdrplay
[16:32] <SpacenearUS> New vehicle on the map: 03KM4SDX-12 - 12http://tracker.habhub.org/#!qm=All&q=KM4SDX-12
[16:32] <SA6BSS-Mike> http://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/
[16:33] <Ben-AstroSoc> ok i've written a barebones script
[16:33] <Ben-AstroSoc> it sends the packet and listens for a 0xB5 at which point LED
[16:34] <daveake> jakeio It's all in here https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_(UBX-13003221)_Public.pdf see P158 for a start
[16:34] <Clarkey> OK, well I'm just looking to launch a HAB into space, first time ever, to take some pictures. Is that a detailed enough description to help with a recommendation? (I'm a school teacher running this flight as a project for a club, btw)
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[16:34] <jakeio> daveake, thank you once again!
[16:35] <jakeio> Oh, erm, I already had that one open! I'll keep trawling through it.
[16:36] <Ben-AstroSoc> page 171, jakeio
[16:36] <jakeio> Thanks.
[16:36] <SpeedEvil> Clarkey: where are you?
[16:36] <Clarkey> Skipton
[16:36] <fsphil> not sure I'd recommend the sdrplay until they improve their drivers/software
[16:37] <Ben-AstroSoc> http://pastebin.com/QMyPvguG barebones code. same result, sends packet, nothing in response
[16:37] <mfa298> Clarkey: preferably don't use the space word. after that some of it comes down to personal preference. I quite like havign a real radio (something like the 817) as I find it easier to operate when travelling. You can also do some of the final tracking from signal strength alone (saves trying to cart laptops around woods)
[16:37] <Clarkey> I feel a bit out of my depth tbh, but plodding along OK :)
[16:37] <fsphil> not sure you'll manage to get one into space
[16:37] <fsphil> that needs a much bigger budget than these flights normally have :)
[16:37] <daveake> :-)
[16:37] <daveake> Also have a read of http://www.daveakerman.com/?p=1732
[16:38] <mfa298> getting an rtlsdr early on gives something to start with an see how you cope with the various software options - you can also try using it to track other peoples flights and see how it does
[16:38] <fsphil> yeah definitly get the rtlsdr, even if you get something else later too
[16:38] <fsphil> very handy things to have around
[16:38] <Clarkey> Yeah, I know, it's not really space! I've just got used to saying that from reading all the GSBC literature
[16:39] <daveake> Good phrase ^^^
[16:39] <daveake> hence http://www.notreallyspace.com/ :-)
[16:39] <SA6BSS-Mike> agree, u wont notice much differnce in the more expensive receivers due to u being quite close to the balloon all the time
[16:40] <Clarkey> Daveake, ha
[16:41] <fsphil> "30% of the way to space"
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[16:42] <daveake> 44% sometimes :)
[16:42] <daveake> but not 49.5 :/
[16:43] <fsphil> some day perhaps
[16:43] <fsphil> we'll need a better gps module
[16:43] <daveake> and balloon
[16:43] <Ben-AstroSoc> mmh, tomorrow I'll just write out teh inititalisation stuff adn get the rest working for the demo
[16:43] <Ben-AstroSoc> can't fly until I solve this
[16:44] <fsphil> you still have interrupts
[16:44] <fsphil> that doesn't count as simple :p
[16:45] <Ben-AstroSoc> how would you read uart without the interrupt? wait for RXC0 to go high in a while loop?
[16:46] <fsphil> yeah
[16:46] <Ben-AstroSoc> a'ight
[16:47] <daveake> With cli(); and nothing to enable interrupts, maybe he doesn't?
[16:48] <daveake> Certainly worth doing a loopback to see if the rx code is working at all
[16:48] <fsphil> better to have no interrupts at all here
[16:48] <daveake> yes
[16:49] <jakeio> Are there any safety concerns to consider when using the NTX2B? I mean, it's not nearly powerful enough to pose any danger by just being near to it! But is there a risk of RF burns or anything? Better to ask than to worry I suppose.
[16:49] <daveake> no
[16:49] <jakeio> Haha!
[16:49] <jakeio> Well, thought I should ask, after I've been playing with out all day!
[16:49] <daveake> You won't get a burn from 10mW
[16:49] <fsphil> worst it will do is warm you up my some small fraction of a degree
[16:50] <jakeio> Didn't think so.
[16:50] <fsphil> you are more of a risk to it than the other way around
[16:50] <daveake> You weren't hoping to have kids someday were you? :p
[16:50] <Ben-AstroSoc> i hadn't realised i hadn't sei()'d
[16:50] <Ben-AstroSoc> oops
[16:50] <jakeio> Haha daveake!
[16:50] <jakeio> I hope you don't need that arm...
[16:50] <jakeio> Etc.
[16:50] <fsphil> Ben-AstroSoc: you still have 2 stop bits
[16:51] <Ben-AstroSoc> huh? USBS0 isn't set
[16:51] <fsphil> UCSR0C = 1<<UCSZ01 | 1<<UCSZ00;
[16:51] <Ben-AstroSoc> that sets 8 data bits
[16:53] <fsphil> yes so it does. carry on
[16:55] <fsphil> just testing you :p
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[16:55] <Ben-AstroSoc> I 100%'d this module :p
[16:58] <Ben-AstroSoc> there's often a couple of bytes before the first byte of the packet when the board boots
[16:58] <Ben-AstroSoc> idk if that doesn't help
[16:59] <fsphil> I would suggest having a numeric value instead of gpsRxChar == 'µ'
[16:59] <Ben-AstroSoc> i got errors when I tried to use 0xB5
[16:59] <fsphil> what error?
[16:59] <Ben-AstroSoc> oh, maybe because I used ' '
[17:00] <Ben-AstroSoc> nvm compiles fine
[17:02] <Ben-AstroSoc> still no ack
[17:02] <Ben-AstroSoc> https://www.irccloud.com/pastebin/Q00Q3LnK/
[17:03] <jakeio> May I ask, how do you "fake" the altitude?
[17:05] <fsphil> well that's about as basic as you can get. I'm definitly missing something
[17:06] <Ben-AstroSoc> the M8 is definitely default at 9600
[17:06] <Ben-AstroSoc> baud
[17:08] <Ben-AstroSoc> i can't think of anything else
[17:08] <Ben-AstroSoc> is there any wiring on the breakout I'm supposed to have done?
[17:08] <Ben-AstroSoc> it's upu's
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[17:10] <fsphil> don't believe so. are you driving it at the right voltage?
[17:10] <Ben-AstroSoc> 3.3v, yeah
[17:11] <fsphil> the checksum in the packet you're sending checks out fine
[17:11] <Ben-AstroSoc> i voltage tested the entire board before I plugged anything in
[17:12] <Ben-AstroSoc> i just checked the packet against the M8 spec and I don't htink it'#s wrong
[17:13] <Ian_> jakeio faking altitude, are you thinking of launching from Mexico perhaps? [joke] :)
[17:13] <Ian_> afk bbl
[17:15] <daveake> they got trumped
[17:16] <Ben-AstroSoc> eh, i'm gonna take a break then write out the initialisation logic so at least we can demo the board
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[17:56] <jakeio> I've noticed a significant drop in the accuracy of received transmissions since connecting my GPS to the other 5V pin, is it possible that the reduction in available current for the radio is causing this?
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[17:57] <daveake> Use a better PSU and cable
[17:59] <mfa298> also check what gps you have, not all are happy with 5v, they might want to be on a 3v3 pin
[18:00] <daveake> Since there's regulation from 5V to 3.3V, and you're using the 3.3V rail to drive the NTX2 data pin, regulation of the 3.3V is very important
[18:00] <daveake> So for that to be dropping when you connect the GPS to the 5V line, that would suggest a very poor 5V rail
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[18:14] <SpacenearUS> New vehicle on the map: 03KK4IAW-1 - 12http://tracker.habhub.org/#!qm=All&q=KK4IAW-1
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[18:18] <SpacenearUS> New vehicle on the map: 03BENNY_1 - 12http://tracker.habhub.org/#!qm=All&q=BENNY_1
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[18:26] <jakeio> Whoops, yes, my GPS is on a 3v3 pin, not a 5v pin. However, I know that there is only about 50mA to share between these lines.
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[18:30] <mfa298> depending on the Pi and what else is plugged in you may be ok pulling more than 50mA
[18:31] <mfa298> I think the 50mA figure originally came from the first Pi's and was what was free with things like the camera using all it's allocated power
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[18:35] <Ben-AstroSoc> jakeio: let me know if you get your GPS to drop into airborne dynamic model
[18:36] <jakeio> I think I have, I've no way of telling yet. Unless I fake altitude, not sure how to do that though.
[18:37] <Ben-AstroSoc> do you get the acknowledgement packets?
[18:38] <jakeio> Not that I know, however, I'm not reading for them.
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[19:06] <SpacenearUS> New vehicle on the map: 03W8YX-6 - 12http://tracker.habhub.org/#!qm=All&q=W8YX-6
[19:06] <fsphil> you can't be sure it's working then :)
[19:09] <SpacenearUS> New vehicle on the map: 03Kk4iaw_chase - 12http://tracker.habhub.org/#!qm=All&q=Kk4iaw_chase
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[20:39] <arjunnaha> What does it mean if my name is grey on the recent changes?
[20:39] <arjunnaha> On the wiki
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[22:53] <KT5TK> A very old attempt to start something like SSDV in 1997:
[22:53] <KT5TK> https://www.tapr.org/pdf/DCC1997-APRSvision-WB4APR.pdf
[22:55] <KT5TK> Some thoughts are still valid today. For example it would be a good idea to only let mobile stations use the igates and APRS-IS infrastructure.
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[23:00] <fsphil> not much technical detail
[23:02] <fsphil> you should send him a link to your images :)
[23:02] <KT5TK> It never took off. I wonder how many years nobody was taking care of picture transmission. SSDV is way more advanced.
[23:03] <KT5TK> Yes, I'm just looking for a strategy to safely introduce pictures in APRS
[23:03] <KT5TK> If Bob did his, it can't be wrong ;)
[23:03] <KT5TK> this
[23:04] <fsphil> yeah, prior art :)
[23:05] <Ian_> Seems that Sven is working on addressing the shortfall, aided and abetted by ^^ on the habitat end of things
[23:05] <fsphil> his version is much simpler. makes sense for the limited hardware back in 1997
[23:07] <KT5TK> Ian_ Yes, I know. Sven is working together with me
[23:09] <Ian_> Ha, no Thomas, I meant fsphil, although I do recognise you as a DL7AD collaborator :) I don't remember much, but I read it all!
[23:14] <Ian_> My reference ^^ was to fsphil as he appears to have been tweaking the back end systems a little to accommodate developments. I appreciate that you are busy working with Sven.
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[23:17] <SpacenearUS> New position from 03Legionowo after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=Legionowo
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[23:20] <KT5TK> DL7AD was checking yesterday if it was possible to increase the baud rate to 19k2. However just changing the audio sample rate and the baud parameters in direwolf was not sufficient. However he was able to increase the baud rate above 10k, however with increasing packet loss.
[23:21] <SpacenearUS> New position from 03SP6NVB-11 after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=SP6NVB-11
[23:22] <DL7AD> Ian_: even 14k has been possible :P
[23:26] <Ian_> I got the impression that Sven had indicated that it was the same packets each time. I think I got that wrong, but the results have certainly been impressive, albeit that I'm not sure about the distance between tx and rx. I watch with interest . . . naturally!
[23:27] <DL7AD> Ian_: 10cm :D
[23:29] <DL7AD> this particular PCB has an error in the LPF. it only emits 1mW or so.
[23:30] <Ian_> No noticeable sprogs on the third harmonic then :)
[23:32] <DL7AD> yes
[23:32] <DL7AD> our first transmitter had only -35dB on the first
[23:32] <DL7AD> but you would be unable to receive this at 10dB,
[23:33] <DL7AD> dBm
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[23:36] <fsphil> have you seen http://www.rowetel.com/blog/?p=5080 ?
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[23:37] <DL7AD> no
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[23:39] <DL7AD> fsphil: but he uses FSK not GFSK
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[23:51] <SpacenearUS> New vehicle on the map: 03yg9dfn_chase - 12http://tracker.habhub.org/#!qm=All&q=yg9dfn_chase
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[23:56] <Ian_> Gnite all
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[00:00] --- Sun Apr 10 2016