highaltitude.log.20150328

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[01:12] <fxmulder_> anyone used openrocket before?
[01:17] <cambazz> it would be interesting to test it
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[04:24] <Bobsaget> can anyone help me setup my odroid (raspberry pi like device) to work with dl-fldigi and an RTLSDR
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[07:40] <Reb-SM0ULC> morrn
[07:50] <SA6BSS> tjena
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[09:55] <mfa298> Bobsaget: depending on how much cpu power that device has it may not be able to do that.
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[10:55] <Herman-PB0AHX> ga all
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[11:10] <Lunar_Lander> hello
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[11:19] <Bobsaget> mfa298 or anyone else, what are the correct settings for using one of these SDR dongles?
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[11:23] <Geoff-G8DHE-M> Any particular settings , keep the LNA gain down if there are any strong signals around, adjust the freq. compensation on a known signal like an FM band broadcast.
[11:25] <bertrik> Bobsaget: also, use USB de-modulation, with about 3 or 4 kHz bandwidth
[11:25] <Bobsaget> ok how do i get a payload??I do not see anythign under the all payloads (testing) tab
[11:25] <Bobsaget> I think the instructions i see here are wrong
[11:26] <Bobsaget> the --hab mode crashes
[11:26] <Bobsaget> someting to do with portaudio
[11:26] <Bobsaget> so i started without
[11:26] <prog> good morning
[11:26] <prog> sup?
[11:27] <Geoff-G8DHE-M> Your talking dl-fldigi here see http://ukhas.org.uk/guides:tracking_guide I think you might find that Pulse Audio has a problem.
[11:27] <Bobsaget> under devices should i have oss checkmarked?
[11:27] <Bobsaget> that is the page i'm using, also, when i opened it, it says something about an update
[11:27] <Bobsaget> i followed the instructions on the ubuntu build
[11:28] <Geoff-G8DHE-M> No ignore that update its tied up with the fldigi code, but the "improvements" have damaged the RTTY mode
[11:29] <Geoff-G8DHE-M> Only Windows here so can't advise on Ubuntu problems.
[11:30] <Bobsaget> can anyone tell me where this "flight drop down box" is?
[11:30] <Bobsaget> it is not on my version like in the picture of the wiki
[11:31] <Geoff-G8DHE-M> If your not in HAB mode then it won't have anything in it, it has to talk to habitat servers to get the data.
[11:32] <Bobsaget> ok for whatever the reason, it opened in HAB mode and i see the flight tab
[11:32] <Bobsaget> only one option
[11:32] <Bobsaget> Pecan Femto rev 2 Test D-7
[11:33] <Bobsaget> click on auto-configure and nothing happens
[11:34] <Geoff-G8DHE-M> Update the list first. but there are not many flights scheduled at present
[11:34] <Geoff-G8DHE-M> Yup only the one
[11:34] <Geoff-G8DHE-M> When you select that flight and click Autoconfig the mode will change to DOMX22
[11:35] <Geoff-G8DHE-M> lower left statues bar
[11:35] <Bobsaget> you mean DomEX 22?
[11:35] <Bobsaget> ohh yes
[11:35] <Geoff-G8DHE-M> its shown on the Statusbar as DOMX22
[11:35] <Bobsaget> then says Sound error, no such file or directory
[11:36] <Geoff-G8DHE-M> Probably a Ubuntu problem with PulseAudio
[11:36] <Geoff-G8DHE-M> I know fsphil has been fighting it for ages!
[11:36] <Bobsaget> can i ignore it since i'm using a USB dongle?
[11:37] <Bobsaget> and not the sound input?
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[11:37] <Geoff-G8DHE-M> no you feed the audio from what ever SDR software your using to drive the Dongle to dl-fldigi via PaulseAudio, unless you use a cable and the actual audio i/o
[11:38] <fsphil> my pulseaudio problem didn't cause any crashes
[11:38] <fsphil> just messed around with the audio enough to prevent decoding
[11:38] <Bobsaget> wait so i need a seperate program to feed dl-fldigi?
[11:38] <Bobsaget> i do not understand how anyone gets this going
[11:38] <fsphil> what's your radio?
[11:38] <Bobsaget> its a simple RTL SDR dongle
[11:39] <fsphil> right. then yea, you need gqrx
[11:39] <Geoff-G8DHE-M> dl-fldigi is just the Modem software you need a SDR program to drive the Dongle
[11:39] <Bobsaget> ok i will install gqrx
[11:39] <fsphil> fldigi only works with low bandwidth audio signals, it can't read directly from the sdr (though there's no technical reason why it couldn't be made to)
[11:39] <Bobsaget> so under devices
[11:39] <Bobsaget> do i click oss or what?
[11:39] <fsphil> gqrx reads from the rtlsdr, and outputs the audio fldigi can use
[11:40] <fsphil> you'll need portaudio
[11:40] <fsphil> and leave the sound card selection on default
[11:40] <Bobsaget> libportaudio-dev ??
[11:41] <fsphil> no, in fldigi's sound card config
[11:41] <fsphil> I'll take a screenshot
[11:41] <Bobsaget> ahh cool
[11:41] <Bobsaget> yes i seleced that
[11:41] <Bobsaget> now the screen flow graph is working at the bottom
[11:42] <fsphil> http://imgur.com/LW0Jm6K
[11:42] <fsphil> good
[11:42] <fsphil> at this point try and get gqrx working
[11:42] <Bobsaget> ok mine says not default
[11:42] <Bobsaget> but hw:0,1
[11:42] <Bobsaget> built in audio
[11:42] <fsphil> okie, change it to default
[11:43] <fsphil> or pulse
[11:43] <Bobsaget> cannot
[11:43] <fsphil> hmm, you have no other options?
[11:43] <Bobsaget> i can click the PulseAudio box
[11:43] <Bobsaget> then it asks for server string
[11:43] <fsphil> in portaudio, what options do you have?
[11:44] <Bobsaget> just the "Built-in Audio: (hw:0,1)
[11:44] <fsphil> odd
[11:44] <Bobsaget> i did remove pulseaudio from this box
[11:44] <Bobsaget> setting up direwolf APRS rx
[11:44] <fsphil> that was my next question :p
[11:45] <Bobsaget> it was causing trouble with my direwolf aprs igate
[11:45] <Bobsaget> cool there is an arm package for gqrx
[11:45] <Bobsaget> hopefully it works
[11:45] <fsphil> doubtful :)
[11:46] <Bobsaget> yea
[11:46] <fsphil> you're not doing this on a pi are you?
[11:46] <Bobsaget> no an odroid U3
[11:46] <fsphil> ah
[11:46] <fsphil> might work, dunno
[11:46] <fsphil> I didn't have much luck with gqrx on the pi2, worked for a few moments but always locked up
[11:48] <Bobsaget> well gqrx installed pulseaudio for me it appears
[11:48] <Bobsaget> along with a lot of other things
[11:48] <mfa298> if you're new to all this it might make sense to try it all out on a moderately decent modern PC first, get used to how the bits work and then try it on other hardware
[11:48] <fsphil> mmm
[11:49] <Bobsaget> yeah, but i don't have a PC to leave running alll the time
[11:49] <Bobsaget> this odroid would work nicely, since it's already doing APRS igate
[11:49] <Bobsaget> its doing that from the hardware mic input
[11:49] <Bobsaget> from a beofang
[11:49] <Bobsaget> works good. on the 60th floor of a highrise in Hong Kong
[11:50] <fsphil> nice
[11:51] <Bobsaget> damn this gqrx package is installing everything but the kitchen sink
[11:54] <Bobsaget> [warn] PulseAudio configured for per-user sessions ... (warning).
[11:54] <Bobsaget> gettting a lot of PulseAudio errors: Connection refused
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[12:00] <Bobsaget> cool gqrx is working
[12:00] <Bobsaget> fsphil can u help me with what settings i need in gqrx?
[12:08] <Bobsaget> ok the default option is there now too in the dl-fldigi port audio configuration
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[12:12] <Bobsaget> and once again, i give up with this dl-fldigi
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[12:15] <SA6BSS> load win and it will work out of box
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[12:37] <mfa298> Bobsaget: get one bit working in a way your happy with how it's working then move onto the next piece.
[12:37] <mfa298> so first get to a point you can get a signal out of gqrx that you can listen to as audio
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[12:38] <mfa298> you're potentially going to do half the work yourself as I'm not sure anyone has got the whole setup working on arm yet so that's potentially going to give you various other (unknown at this point) issues
[12:39] <mfa298> which is why I suggested getting it working on something a bit more standard first
[12:39] <prog> https://twitter.com/sdrsharp/status/581797455857102848
[12:39] <prog> Airspy now supports 12MHz bw
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[12:39] <prog> the new firmware will have 12, 6 and 3 MSPS
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[12:56] <Laurenceb_> nice work
[12:56] <Laurenceb_> how do you upgrade the firmware, does it have DFU?
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[13:00] <Laurenceb_> one "problem" I've noticed is the TCXO does tend to drift as the board heats up
[13:00] <Laurenceb_> and it can get pretty hot
[13:01] <Laurenceb_> does the firmware have any power saving improvements?
[13:02] <prog> it's just a firmware and lib update
[13:02] <prog> we have a package that just flashes the hardware
[13:02] <prog> a single batch file
[13:03] <prog> Laurenceb: the drift is within 0.3ppm
[13:03] <prog> http://3.14.by/en/read/airspy-sdr-Si5351C-frequency-temperature-stability-FE-5680A
[13:15] <Laurenceb_> not bad
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[13:16] <happil> Hello all... I just thought of an ida
[13:17] <happil> Let's say you want to prematurely pop the balloon
[13:17] <happil> How about using a timed/remote control laer?
[13:17] <happil> You can get a 1W burning laser that can easily pop the latex balloon mid-flight, and either time it with arduino or attach to radio receiver..
[13:19] <edmoore> if you're going to go to the effort of ending the flight deliberately, it's probably easier to actually separate from the balloon
[13:19] <edmoore> thus reducing the chance of tangling anf other problems
[13:19] <adamgreig> just use the laser to cut your cord
[13:19] <edmoore> also you probably shouldn't fly 1W lasers
[13:19] <adamgreig> if you really want a 1W laser
[13:19] <adamgreig> haha, that
[13:19] <edmoore> they're going to land in people's back gardens
[13:19] <SpeedEvil> Also, balloons have fun issues
[13:19] <happil> I'm not saying it's practical... but it'd be epic.
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[13:20] <SpeedEvil> Sometimes you can burn stable holes in them
[13:20] <HB9RSU2> happil: why not, just try it. I prefer a mechanical actuated separation
[13:20] <SpeedEvil> Or simply a magnet
[13:20] <happil> It'd be harder to align a laser to burn the cord
[13:20] <SpeedEvil> With a coil to reverse the field and make it pop off
[13:20] <SpeedEvil> There are many many options
[13:20] <happil> Because the cord is much thinner
[13:20] <adamgreig> would it though
[13:21] <adamgreig> you just... run the cord right by the laser aperture
[13:21] <happil> I'll launch my first balloon first.. then see after
[13:21] <edmoore> plan
[13:21] <happil> @adamgreig The cord would wobble in flight, wouldn't it?
[13:21] <edmoore> no need for @'s in irc
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[13:21] <adamgreig> not if you secure it there..
[13:21] <edmoore> happil, you can hold the cord tightly
[13:21] <edmoore> say between two eyelets
[13:22] <happil> okay
[13:22] <SpeedEvil> Thre is no reason to use the cord, and not a resistor, for example
[13:22] <SpeedEvil> ^a laser
[13:22] <edmoore> people do similar for hot-wire cutdowns
[13:22] <SpeedEvil> Not that there is anything bad about a laser
[13:22] <SpeedEvil> Oooh.
[13:22] Action: SpeedEvil wonders about making lithium/lead damascus
[13:22] <edmoore> i am in principle a fan of lasers being used for Things
[13:23] <edmoore> because lasers are cool
[13:23] <happil> ikr
[13:23] <adamgreig> use a bigger laser from the ground
[13:23] <adamgreig> to pop the balloon
[13:23] <happil> lol.... yes
[13:23] <adamgreig> better, to cut the thread
[13:23] <happil> YES... just yes
[13:23] <happil> Find a 100w laser diode from somewhere, make the driver
[13:23] <happil> then aim
[13:24] <happil> then realise that you hit 300 people
[13:24] <happil> in a plane
[13:24] <adamgreig> let me know when you're testing so I can look the other way
[13:24] <HB9RSU2> next sugestion is probably the use of a SAm ;-)
[13:24] <happil> military laser gun for the navy?
[13:24] <happil> nuke?
[13:24] Nick change: Family -> Lammergeier
[13:25] <happil> btw do you guys have any specific recommendations for balloon/chute makes, and places to get good cord?
[13:25] <happil> i was thinking of kaymont totex balloon + rocketman chute + cord off amazon or homebase
[13:26] <edmoore> right gtg
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[13:26] <mfa298> happil: http://randomaerospace.com/Random_Aerospace/Welcome.html for balloons and chutes
[13:27] <happil> ik... i am buying from there
[13:27] <happil> but there is pawan and spherachute and more
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[13:27] <mfa298> and http://ava.upuaut.net/store/ for some of the useful bits of electronics
[13:28] <mfa298> depends a bit on what your flying, what you want to acheive and what you want to spend
[13:32] <happil> 800g-1kg payload
[13:32] <happil> rocketman seems the best reviewed for chutes
[13:33] <mfa298> have a play with http://habhub.org/calc/ for ballon sizes
[13:33] <mfa298> generally aim for 5m/s ascent and descent rate
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[14:10] <Ian_> http://randomaerospace.com/Random_Aerospace/Stuff.html good for cord too. So that's where the beer gets hidden. Not bad as long as you don't launch it instead of your package. You could end up thirsty! :)
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[15:00] <michemto> Hey, I'm back...
[15:00] <michemto> with my problems while listening to PITS chip
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[16:34] <michemto> Question... I am getting this data from pits chip...
[16:34] <michemto> $$STRATOS_CHEM,?22,00:00:00,0.00000,0.00000,00000,0,0,0,0.0,5.4,355*C181 $ STRATOS_CHEM,720:00:00,0.00000,0.00000,00000,0,0,0,0.0,5.4,355*@3F7 $$STRATOS_CHEM,704,00:00:00,[ 206.037286] SyR : @ELP : loglevel(0-9) peboo(b) cash() tepminte-áìl-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) Y[{ËkV;+CKK+kcck&nm ·© poweroff(o) show-registers(p) sho-all-timers(q) unraw(r) sync(s) show-tasmes(t
[16:34] <michemto> What's wrong?
[16:36] <chrisstubbs> michemto, did you disable the serial console on the pi?
[16:37] <michemto> Im not sure about that since i didn't config it myself :) Which command should be written?
[16:37] <michemto> Nevermind - asked from IT guy - he did this
[16:37] <chrisstubbs> sudo raspi-config
[16:37] <chrisstubbs> advanced
[16:37] <chrisstubbs> disable serial
[16:37] <michemto> He will check it out now
[16:42] <infaddict> afternoon all. when setting up intervalometer on camera for 30sec pics, i am setting infinite focus, display off, review off, no zoom. anything else i need to consider?
[16:43] <infaddict> should i choose a particular shot setting such as auto, outdoor, night etc?
[16:44] <edmoore> which camera?
[16:44] <edmoore> is this a general photography question or a chdk question?
[16:44] <edmoore> if in doubt i'd try and auto everything as a baseline
[16:45] <infaddict> chdk for HAB flight
[16:45] <infaddict> running on a canon A1000IS
[16:45] <infaddict> its taking the pics great, just hard to test the conditions (light etc) for up high
[16:45] <infaddict> currently in auto mode
[16:46] <infaddict> but with the intervalometer setting infinite focus
[16:46] <edmoore> that's probably a sane default
[16:46] <edmoore> if you're flying definitely during the day then i'd just do sunny-16
[16:46] <edmoore> so set the shutter speed to 1/your_ISO and set the aperture to f16
[16:47] <infaddict> yes it will be a daytime flight
[16:47] <edmoore> so if it's iso 200, 1/200th sec shutter at f16
[16:47] <edmoore> (or 1/400thish at f/8)
[16:47] <infaddict> iso currently auto. but can goto P mode and set all this is you think thats better?
[16:47] <edmoore> tbh normally just fly auto for a simple flight
[16:48] <edmoore> i worried about it when doing high speed photography from an experimental hab
[16:48] <edmoore> but for pretty landscapes i just auto
[16:48] <infaddict> mmm so i have 1 canon doing 30 sec pics and a 2nd canon (identical model) doing video
[16:48] <infaddict> need to check the video and see if it goes to sleep or whether i need a lua script for video too
[16:48] <infaddict> will be running 2-3 hours
[16:49] <chrisstubbs> infaddict, they sometimes have an upper limit for video length
[16:49] <infaddict> yer - i'm nosing around chdk scripts to see if i can get around that
[16:49] <infaddict> at very least, start new video. ideally bypass limits.
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[16:51] <infaddict> aha http://chdk.wikia.com/wiki/Continuous_Video_Scripts
[16:51] <infaddict> 4Gb limit for video, so these scripts simply start a new video
[16:52] Nick change: fl_0 -> fl_0|afk
[16:54] Nick change: Guest34448 -> nigelvh
[17:20] <craag> There are also some extra restrictions on simple cameras to prevent long video recording
[17:21] <craag> due to higher taxes on 'camcorders' that can capture longer than 45 minutes or so
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[17:21] <edmoore> very upsetting limitation on the 5D at work
[17:22] <edmoore> nearly missed a couple of important firings because of that
[17:27] <craag> I assumed a 5D would be far enough from the 'simple' end for that to be worth paying more for
[17:28] <edmoore> yep
[17:28] <edmoore> but no
[17:28] <craag> :(
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[17:42] <GaryMortimer> evening/afternoon depending on where you might be, anybody know of software to send data down via morse with NTX2 and UNO I know enough to be dangerous with all this have UNO sending morse just stumbling with parsing the GPS as I think software serial gets in teh way
[17:43] <GaryMortimer> as I have said, I know blow all about all of this why morse your ask, well its head readable if all else fails
[17:49] <craag> So it sounds like you've got the morse working, just not parsing the gps responses?
[17:49] <craag> 1st step is not to use software serial
[17:49] <craag> at least - not for the gps.
[17:51] <GaryMortimer> The morse works and I can parse the GPS using software serial but not both at the same time!
[17:51] <GaryMortimer> sadly I don't have the skill set
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[17:52] <Davespice> hi folks, anyone here have experience with the osmocom RTL-SDR software? please pm if so
[17:52] <GaryMortimer> i am guessing i shoul dbe using 0 and 1 for the GPS and foregoing serial monitoring?
[17:53] <craag> GaryMortimer: How are you timing your morse transmissions?
[17:53] <craag> (on the arduino)
[17:54] <GaryMortimer> All I have done is used this Morse Code Transmitter by Daniel Forsstrom - SM4XAS- www.forsstrommusic.se and it works
[17:55] <craag> Ah I see
[17:55] <GaryMortimer> its hidden in his arduino link under transmit morse
[17:56] <craag> The simplest way to do this, is to use Hardware Serial, and listen for a serial string once you've finished a more 'sentence'
[17:56] <craag> *morse 'sentence'
[17:56] <GaryMortimer> thats 0 and 1?
[17:56] <craag> both that morse transmitter code and softwareserial, want total control of the arduino.
[17:57] <craag> Yes I think so
[17:57] <craag> Should be labelled RX,TX or something like that
[17:57] <GaryMortimer> ok, i would need another way of monitoring or listening out I guess to make sure its working
[17:58] <craag> Well you could get it to tell you over the morse ;)
[17:58] <GaryMortimer> yeah
[17:58] <craag> that's what I tend to do, add debugging into the rtty sentences while setting it up
[17:59] <craag> More than that and I'd use a scope/logic analyzer anyway.
[17:59] <GaryMortimer> i will start down that route a long long road for me ;-)
[17:59] <GaryMortimer> all jolly interesting though
[17:59] <craag> :)
[17:59] <edmoore> giving up with random internet arduino libraries is a painful first step
[17:59] <edmoore> but they all hide from you things that they shouldn't
[17:59] <edmoore> like they're both trying to use the same timer or whatever
[18:00] <edmoore> 99% of beginner arduino problems we have in this channel are random arduino library from the internet 'A' not working with random arduino library from the internet 'B"
[18:00] <GaryMortimer> its all learning so thats cool
[18:00] <GaryMortimer> ah I am exhibit A then!
[18:00] <edmoore> so yes, a bit annoying but you'll be much happier in the longer run if you slowly build it up from scratch
[18:01] <craag> Generating morse code from scratch I think was one of the first things I did with an arduino
[18:01] <craag> just loops and delays
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[18:02] <DL7AD> fsphil: ping
[18:02] <GaryMortimer> I made a VIC 20 do morse and RTTY back in 1980 something I would not have a clue how I did it now
[18:02] <craag> Then you break through into learning more of what the hardware can do, eg. timers and interrupts.
[18:03] <GaryMortimer> The cool thing is raspberry Pi and Arduino feels like those days again, but better
[18:03] <edmoore> once you grok timers and interrupts then the entire world of microcontrollers is instantly demystified
[18:03] <edmoore> that's basically how you do things with them
[18:03] <craag> Arduino is a nice platform to get started on - but avoid the large 'do-everything' libraries - they try to hide the more complex stuff and often make more problems by doing that.
[18:04] <craag> You noticed softwareserial as a problem though - that's an excellent start ;)
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[18:07] <GaryMortimer> thanks craag ;-)
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[18:11] <Vaizki> if you do things with timers and interrupts and use arduino libraries, you really have to check all the libs you use for conflicts not only with your code but also each other...
[18:12] <Vaizki> timer 0 is basically owned by arduino libs at least, don't touch it
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[18:25] <M6XiMaN> Woo-hoo! Passed the Intermediate amateur radio licence exam
[18:26] <infaddict> well done M6XiMaN
[18:26] <M6XiMaN> Thank you
[18:27] <infaddict> thinking about studying and doing the foundation myself. are they still done at the ukhas conventions?
[18:27] <M6XiMaN> I did my Foundation and Intermediate at the London Hackspace
[18:27] <infaddict> ok. i know local radio clubs also do them.
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[18:29] <M6XiMaN> They just did another Foundation course recently, so I suspect the next one would be in June
[18:29] <craag> infaddict: If there's interest - I don't see why we wouldn't do it again.
[18:29] <craag> (at the ukhas conf)
[18:29] <infaddict> craag: i'd certainly be up for it
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[18:30] <craag> Ok, there'll be an email on the mailing list a lot nearer the time, once venue/date are sorted out.
[18:31] <infaddict> how do i sign up to email list? i joined the google group but couldnt see a sign up for email?
[18:31] <craag> That's the google group :)
[18:32] <craag> I'm signed up so it emails me for everything - like a mailing list ;)
[18:32] <infaddict> aha ok cool i will do the same thx ;-)
[18:33] <M6XiMaN> infaddict: Just asked - next Foundation is likely to be in May
[18:34] <M6XiMaN> infaddict: If you join the london-hack-space and lhs-radio Google groups you'll see a notification on the list with about six weeks notice
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[18:35] <infaddict> ok thx M6XiMaN. i live 350 miles from London so wont make a special trip unless i'm there for business or a convention/meeting.
[18:35] <M6XiMaN> infaddict: The course runs over a Saturday and Sunday and incldues the exam
[18:36] <M6XiMaN> And for those of you who love your drones, there is a "London Aerospace" group that meets once a month. A few of our members are going to be on BBC's "Airheads" programme :)
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[18:51] <SP9UOB-Tom> evening All
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[19:16] <fsphil> DL7AD: pong
[19:17] <SP9UOB-Tom> hi fsphil
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[19:17] <fsphil> evening
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[19:33] <infaddict> got 2 nice lua scripts working via chdk now! one doing regular pics and other doing auto restart video when 4.29Gb limit reached.
[19:33] <infaddict> now adding fresh energizers to do a timed test to see how long both last ;-)
[19:35] <KF5WYX> Hi all
[19:37] <infaddict> hi KF5WYX
[19:40] <fsphil> lua is pretty odd
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[19:48] <SP9UOB-Tom> all: here is my latest video: https://www.youtube.com/watch?v=czQSrYfvuyE
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[19:53] <cambazz> hey guys look at http://pasteboard.co/29jxm3e9.png, this is my lora mode switcher. i am working on a test scenario, i managed to make a matching transmitter receiver that transmits and receives different modes knowing what to listen
[19:57] <mikestir> interesting. maybe you could modify ssdv to use progressive jpeg with each scan sent at the next higher rate
[19:58] <mikestir> so you'd get graceful degradation in picture quality rather than dropouts
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[19:59] <KF5WYX> Arduino is generating 1200Hz tones and 2400Hz tones - that's a big step towards AFSK :) Just wanted to share.
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[20:01] <SP9UOB-Tom> KF5WYX: should be 1200 and 2200 :-)
[20:02] <KF5WYX> SP9UOB-Tom, Thank you! I almost left that error in the code.
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[20:02] <SP9UOB-Tom> KF5WYX: You're welcome :-)
[20:02] <KF5WYX> The only real job left to make this work, is to give it a bit-array and get the timing right.
[20:02] <mikestir> SP9UOB-Tom: was it you that did some work with a discrete class E amplifier for aprs?
[20:03] <SP9UOB-Tom> mikestir: guilty ;)
[20:04] <mikestir> what transistor did you use?
[20:04] <SP9UOB-Tom> mikestir: class E matching is preety easy
[20:04] <SP9UOB-Tom> mikestir: BS170 (in HF range)
[20:04] <mikestir> right, so you never tried that one at 2m?
[20:05] <mikestir> seems like Coss might be a bit high for vhf
[20:05] <SP9UOB-Tom> mikestir: no, @2m im using internal transistor of Si4464
[20:06] <mikestir> I was looking at it for a DF application rather than hab, so wanted something like 500mW to a watt. I'm thinking along the lines of a si4063 driving an external mosfet with a higher supply voltage
[20:06] <SP9UOB-Tom> mikestir: Swithing times are immportant ton+toff should be AT LEAST 3 times smaller than 1/2 of the period
[20:07] <mikestir> ok that's a useful rule of thumb
[20:07] <SP9UOB-Tom> mikestir: good idea, just look for high sped mosfets
[20:07] <SP9UOB-Tom> sorry for the typos :-)
[20:08] <mikestir> yeah there's quite a few specced for 900 MHz, presumably for gsm use
[20:09] <SP9UOB-Tom> mikestir: you can also go to class C which is less demanding
[20:09] <mikestir> I'll try one on hf with a bs170 to get a feel for the design procedure - I should have some somewhere
[20:09] <SP9UOB-Tom> mikestir: i was using BS170 with 500 mW output - no problems
[20:10] <kc2pit> That sounds like an entertaining thing to start learning. I've looked around for nice, efficient 435 MHz PAs that could do 36-38dBm. The market mostly seems to think that 435 MHz devices don't need more than 1W output.
[20:10] <mikestir> you I was originally thinking class C bjt but I thought it would be nice to get the power consumption to a minimum
[20:11] <SP9UOB-Tom> mikestir: there is nice class E matching calculator software
[20:11] <mikestir> the windows one? I downloaded that earlier but it didn't work on wine so I'll need to install it in a vm
[20:12] <SP9UOB-Tom> just calculate, put square wave on input and feel the smell of load resistor :-)
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[20:13] <SP9UOB-Tom> mikestir: http://sp9uob.verox.pl/resist.jpg
[20:14] <mikestir> kc2pit: http://www.cel.com/product.do?command=viewOverviewDetail&group=4&level2=2415
[20:14] <mikestir> I came across those - good for up to 40dBm
[20:14] <SP9UOB-Tom> kc2pit: there are lots of 70 cm hybrids
[20:15] <SP9UOB-Tom> kc2pit: or the big gun: http://www.w6pql.com/1kw_70cm_ldmos_amplifier.htm
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[20:15] <kc2pit> Heh.
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[20:16] <SP9UOB-Tom> mikestir: yeah the windows one
[20:18] <SP9UOB-Tom> http://www.rfparts.com/module.html
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[21:53] <infaddict> what do people do to stop camera bouncing around and hitting buttons (like on/off/stop!) during flight? i was thinking of cutting specific foam parts to touch the camera only at points with no buttons?
[21:54] <infaddict> i.e. hold it nice and tight from all side but only where there are no buttons
[21:54] <Upu> thats what I did
[21:54] <Upu> or remove the button entirely
[21:55] <infaddict> well, theres quite a few buttons on a canon camera that if pressed could stop it from working properly
[21:55] <myself> strip it down farther, bonus, weighs less
[21:55] <infaddict> so i think holding it on one side on the screen and then again on the top left (no buttons)
[21:56] <infaddict> left side, right side and bottom are fine (no buttons)
[21:57] <myself> or screw it to a bracket with the built-in tripod thread...
[21:57] <infaddict> yep good idea myself. guess the problem then moves to how to anchor the bracket
[21:59] <infaddict> 2hrs into video + photo test and both cameras still going strong on 96% battery. I think they're gonna last a while! Video will fill up SD card after 4 hours.
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[22:02] <SP9UOB-Tom> KT5TK1: hi Thomas :-)
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[22:03] <SP9UOB-Tom> KT5TK1: did You got my parcel ?
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[22:32] <infaddict> ok my 16Gb SD card filled up with video in 2hr 17 seconds on top quality. Theres a long play mode which will do x2 that but not as good quality.
[22:32] <infaddict> either need a bigger card or sacrifice a bit of quality i guess
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[22:59] <KF5WYX> I'm having a brain freeze on this calculation. I have a timer with an accuracy of 0.032 microseconds, that's my timing interval. One period of 1200baud = 833.33~ microseconds, so that's 26041.66~ of my timing period, rounding to 26042 should give me 1200 baud. Can anyone verify?
[23:01] <KF5WYX> To make matters worse, I think I need to time out my ISR and account for it's runtime - I'd expect it to be in the 100 microsecond range, but that's a large margin.
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[23:02] <AdamDynamic> I'm trying to configure my fldigi installation, the window at the bottom is completely black but the orange window at the top has constantly scrolling (non-readable) text
[23:03] <AdamDynamic> Can anyone tell me where the text is coming from if there is (apparently) no signal?
[23:13] <Geoff-G8DHE-M> Check that you haven't altered the waterfall colours to something that is all black ?
[23:15] <AdamDynamic> I haven't changed the waterfall configuration settings from the default settings
[23:15] <Geoff-G8DHE-M> Check them here http://360.g8dhe.net/HAB_Flights/index.php?ind=5
[23:16] <Geoff-G8DHE-M> I've altered mine a little, but can't think why you should be decoding a blank w/f, does the audio level meter or the diamond on the status bar show a signal incoming ?
[23:17] <craag> That is normal from what I remember
[23:17] <infaddict> yer mine just decodes noise as random chars
[23:17] <craag> fldigi may be picking up some digital noise from somewhere - and trying to decode it
[23:17] <infaddict> even if no real signal there
[23:17] <infaddict> the audio would have to be silent for it not to decode anything. if you hear noise then it will be trying to decode it i think.
[23:18] <Geoff-G8DHE-M> Mine does if there is noise showing but at the moment its constant blue and black and no decoding at all ?
[23:19] <mikestir> KF5WYX: sounds reasonable, although your timer tick is very fast (31.25 MHz?)
[23:20] <mikestir> you shouldn't need to count out your ISR as long as it is sufficiently deterministic and much shorter than the interval - any delay it introduces should affect each bit equally, so it won't matter
[23:20] <Geoff-G8DHE-M> No audio/noise no decoding here http://360.g8dhe.net/HAB_Flights/index.php?ind=6
[23:24] <AdamDynamic> It did occur to me that the text could just be 'noise'
[23:25] <AdamDynamic> Expected to see at least 'something' in the waterfall though
[23:25] <infaddict> can u hear any audio if you listen to it AdamDynamic?
[23:25] <infaddict> wondering same for you Geoff-G8DHE-M and your blank signal - any audio at all?
[23:26] <Geoff-G8DHE-M> No I haven't connected the VAC channel to dl-fldigi so no signal at all.
[23:26] <AdamDynamic> I can't hear anything (windows isn't muted, is there a volume control in the application that I'm missing?)
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[23:27] <Geoff-G8DHE-M> Can you give us a screen grab ?
[23:28] <KF5WYX> mikestir, yes, 31.25 sounds right. I got stuck with that by using some sine-wave generator code which I didn't entirely understand. I'm sure I could adjust the frequency and recalculate it all
[23:28] <mikestir> what processor is it?
[23:28] <KF5WYX> having studied the code that-is
[23:28] <KF5WYX> it's an Arduino Uno, so an Atmel
[23:29] <mikestir> so atmega328?
[23:29] <mikestir> it's not running at 31.25MHz then
[23:29] <AdamDynamic> Where's a good place to post a screenshot?
[23:29] <infaddict> imgur
[23:30] <KF5WYX> well, the code was written for a 168, but I'm now running it on a 328. I don't believe it's running at 31.25, but I think (and I'm vague on this) the PWM hardware uses that frequency?
[23:30] <KF5WYX> If I'm wrong about that, then all of my timing is off.
[23:31] <KF5WYX> The chip is 16Mhz - so the code uses a reference clock of 31376.6 for the PWM
[23:32] <mikestir> yes, uno uses a 16 MHz crystal and the atmega has no PLL so you have nothing faster than 16 MHz anywhere on that chip
[23:32] <AdamDynamic> The screenshot: http://imgur.com/Jt2Ck7a
[23:32] <mikestir> it's presumably 31.3 kHz rather than MHz, so your divider calculation is off by a factor of 1000
[23:33] <KF5WYX> mikestir, aaah - actually, I discovered that after posting here and corrected to 24 timer intervals.
[23:33] <Geoff-G8DHE-M> The green bar lower right corner shows there is a signal there, possibly outside the normal audio range.
[23:33] <KF5WYX> Now that you've pointed that out, it accounts for the difference.
[23:34] <KF5WYX> ( I could tell it wasn't right, just by listening to the audio signal )
[23:34] <AdamDynamic> Ah ok, so the text is likely just noise from 'somewhere'?
[23:34] <Geoff-G8DHE-M> its noise but not between 0Hz and 8KHz must be aoutside that range
[23:34] <KF5WYX> mikestir, Thanks for the sanity check, I've been at this around 7 hours, so I'm going to go break and then re-read my code when getting back.
[23:35] <mikestir> KF5WYX: no problem. did you figure out how the sine generator works? I assume it's using a lookup table and phase accumulator?
[23:35] <Geoff-G8DHE-M> Can you show us the waterfall config tab, as it does seem a little odd ?
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[23:37] <AdamDynamic> Config tab: http://imgur.com/YGJI5EG
[23:37] Nick change: fl_0 -> fl_0|afk
[23:37] <Geoff-G8DHE-M> Yup looks normal
[23:38] <infaddict> yep same as mine too. but i dont get that light blue look of the waterfall window.
[23:39] <AdamDynamic> Could any of the other config inputs have an effect? For instance, I only included a 'call sign' on the initial screen as I didn't understand what the other inputs meant (QTH etc)
[23:39] <KF5WYX> mikestir, indeed - in fact, the only bit I wasn't sure about was how ISR works on this chip ( first time writing one for the AT) but a bit of serial debugging worked out.
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[23:39] <Geoff-G8DHE-M> The waterfall is below the light blue screen that's the Tx area (its fldigi not dl-fldigi mode)
[23:40] <Geoff-G8DHE-M> No shouldn't affect the decoding, QTH is Q code for My Location is ......
[23:41] <Geoff-G8DHE-M> Can you select an audio source different from the one you currently have selected ?
[23:41] <AdamDynamic> 'Q code'? (if it's not obvious bv now, I know very little about any of this :)
[23:42] <Geoff-G8DHE-M> Wikipedia its a 3 letter code system used for all radio communications mainly when using CW or not speaking a common languge
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[23:43] <AdamDynamic> I went Configure > Audio and changed the 'capture' to 'internal microphone'
[23:44] <AdamDynamic> When I clap I'm seeing blue/yellow data in the waterfall area
[23:44] <Geoff-G8DHE-M> and what was the result is the Green bar lower right still full length ?
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[23:45] <AdamDynamic> When I start clapping the green bar goes to zero
[23:45] <AdamDynamic> When I stop, it seems to rise to 100% and stay there
[23:45] <Geoff-G8DHE-M> ? What no green showing when you clap it jumps up and down when you clap ?
[23:46] <Geoff-G8DHE-M> Sounds like there is something odd with the audio, do you have some Automatic Gain Control AGC turned on which is winding the gain up whe no audio present perhaps ?
[23:47] <Geoff-G8DHE-M> You would need to check out the Audio settings on the machine, which OS are you using Windows ?
[23:47] <AdamDynamic> I'm not sure how 'responsive' it's expected to be, but it drops to zero when I start clapping and only remains on 100% once the waterfall returns to 'all black'
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[23:47] <AdamDynamic> Windows 7
[23:48] <Geoff-G8DHE-M> Right click the Speaker Icon in the tray and select Recording devices and check out all the settings
[23:48] <edmoore> i reckon: stop clapping
[23:49] <edmoore> see also: understanding dinner party conversations
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[23:50] <AdamDynamic> I can't see anything in the recording settings that looks too odd
[23:51] <AdamDynamic> There's the internal microphone and the VB-Audio Virtual Cable
[23:51] <edmoore> i have come in late
[23:51] <edmoore> in the sound settings of fldigi is it set to the right thing?
[23:52] <AdamDynamic> Geoff suggested changing the input to see if that would solve my problem of no data appearing on the waterfall chart and random text appearing in the window
[23:53] <edmoore> fldigi has its own sound input selection window
[23:53] <AdamDynamic> The text has stopped and the waterfall chart reacts when I clap, suggesting (to me at least) that when the program receives a data input, it works as expected
[23:53] <edmoore> separate from the operating system's
[23:53] <edmoore> it suggests the microphone is plumbed in currently
[23:54] <AdamDynamic> Are you talking about Configure > Operating > Audio > Capture ?
[23:54] <edmoore> maybe
[23:54] <edmoore> i'm sort of a bit drunk
[23:54] <Geoff-G8DHE-M> I still reckong you have an AGC working turning the gain up when there is very low signal levels and its turning up an audio "noise" outside the audio range which is being decoded!
[23:55] <edmoore> just stumbled onto the bus back to oxford from london
[23:55] <edmoore> got a subway (foot-long chicken and bacon ranch on hearty italian) and a laptop to keep me awake and help me sober up
[23:55] <AdamDynamic> Would there be an AGC somewhere in the fldigi package that I may have turned on while trying to fix the problem?
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[23:56] <edmoore> agc is ok. check that squelch is off
[23:56] <edmoore> (sql)
[23:56] <Geoff-G8DHE-M> No nothing like that in fldigi at all, but often within the chipset of the audio on the machine
[23:57] <edmoore> also a man in an anorak (literally) is opining in a loud monotone about seatbelts to the poor woman next to him
[23:57] <edmoore> i might intervene
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[23:57] <AdamDynamic> There are toggle buttons at the bottom for 'AFC' and 'SQL' - both are turned off
[23:57] <Geoff-G8DHE-M> When you use the normal Windows Microphone setup it will often adjust the gain
[23:57] <Geoff-G8DHE-M> upwards untik the correct level of audio is present when speaking
[23:58] <AdamDynamic> It's possible that the microphone is the problem then, in which case it may not be worth worrying about
[23:58] <Geoff-G8DHE-M> AFC is Automatic Frequency Control - it tracks the signal, SQL is Squelch where it turns OFF the audio until a carrier is present, during setup you want these off
[23:59] <AdamDynamic> I'll try it again in the morning with the SDR dongle and SDRSharp, it's could be a step in the set-up that I've overlooked
[23:59] <AdamDynamic> Fresh pair of eyes may help.
[23:59] <Geoff-G8DHE-M> Yup time for bed here as well, good journet edmoore!
[00:00] --- Sun Mar 29 2015