highaltitude.log.20160629

[00:05] <mfa298> the other thing to keep any eye on is the length of your coax, 1/4 and 1/2 wave sections can potentially act as filters depenging on how they're connected.
[00:07] <michal_f> thx mfa298
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[00:17] <Laurenceb__> https://en.wikipedia.org/wiki/Perhapsatron
[00:17] <Laurenceb__> nice naming convention
[00:21] <mfa298> a name like that makes it sound like it's related to the infinite probability drive
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[01:29] <SpacenearUS> New position from 03K6RPT-12 after 038 hours silence - 12http://tracker.habhub.org/#!qm=All&q=K6RPT-12
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[05:06] <Vaizki> my tradeshow booth is 10 meters from the limesdr one, if you have questions on it I'll dig up answers...
[05:14] <x-f> how does it perform on HF? so far only VHF/UHF tests have been published
[05:15] <x-f> specs say "Transmit power: 0 to 10dBm (depending on frequency)" - means it can't transmit on some frequencies?
[05:30] <Vaizki> good stuff.. I already askel about a model with GigE and they laughed, said "soon", many people asking for it
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[06:39] <Vaizki> A team of researchers from the University of Oxford and Durham University, working with a helium exploration company, has developed a brand new exploration approach. The first use of this method has led to the discovery of a world-class helium gas field in Tanzania.
[06:40] <Vaizki> Gas-crazy hab pundits harness uni resources to ensure future of high flying SBCs
[06:41] <Vaizki> (Yes I read The Register)
[06:46] <Vostok> becks beds pal of posh
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[07:37] <SA6BSS-Mike> x-f: 0dbm = 1mW
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[07:58] <x-f> SA6BSS-Mike, so it is, thanks, i didn't know that
[07:58] <AndyEsser> x-f: https://greatscottgadgets.com/sdr/3/
[07:58] <AndyEsser> this helped me to understand dB better :)
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[08:10] <RPF-JR> Morning, anyone got any experience with airspy_rx?
[08:10] <AndyEsser> http://futurism.com/an-ai-just-defeated-human-fighter-pilots-in-an-air-combat-simulator/
[08:10] <AndyEsser> daveake: I'm blaming you for this
[08:10] <daveake> Erm why me?
[08:11] <AndyEsser> running on a raspberry pi
[08:11] <RPF-JR> yep
[08:11] <AndyEsser> All your launches and tests have been collecting data for Killer Pis
[08:11] <AndyEsser> :)
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[08:19] <SpacenearUS> New vehicle on the map: 03SP5RZP-11 - 12http://tracker.habhub.org/#!qm=All&q=SP5RZP-11
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[08:23] <michal_f_off> AndyEsser: are you running airspy on rpi ?
[08:24] <michal_f_off> RPF-JR: I have some limited experience with airspy_rx. but you probably should ask on #airspy
[08:24] <michal_f_off> lots of smart guys there
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[08:24] <michal_f_off> not that here are none ;]
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[08:26] <RPF-JR> Thanks michal_f_off , asking there too, just trying to get audio stream into dl-fldigi
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[08:29] <michal_f_off> you need sdr# for this
[08:29] <AndyEsser> michal_f_off: I am not, have neither an airspy nor an RPi
[08:29] <michal_f_off> airspy_rx doesn't do demodulation
[08:29] <michal_f_off> AndyEsser: ok, my mistake then :)
[08:30] <michal_f_off> RPF-JR: are you under linux or windows ?
[08:30] <RPF-JR> Linux on Pi
[08:31] <michal_f_off> then try with gqrx, but here my experience is 0
[08:31] <RPF-JR> can't run gqrx, too cpu intensive
[08:31] <Darkside> ah
[08:31] <RPF-JR> the csdr library was suggested to generate an IQ stream?
[08:31] <Darkside> you might be able to piece somethign together with csdr
[08:31] <RPF-JR> got a bash snippet somewhere
[08:32] <Darkside> you may be able to piece together a receive flowchain with airspy_rx and piping it through various csdr commands
[08:32] <Darkside> that can be fairly cpu efficient, if you're careful with your filter values
[08:33] <Darkside> you'd want to run the airspy at 2.5MSPS, then as soon as possible decimate the IQ stream down to something lower sample rate, else you'll blow out your cpu
[08:33] <RPF-JR> this is what was suggested by someone else
[08:33] <RPF-JR> airspy_rx -r /dev/stdout -a 1 -f 433.92 -g 18 | csdr fir_decimate_cc 60 0.05 HAMMING | csdr fractional_decimator_ff 1.04166667 | csdr convert_f_s16 | mplayer -cache 4096 -quiet -rawaudio samplesize=2:channels=2:rate=48000 -demuxer rawaudio -
[08:34] <Darkside> yes, but you the need to get that into a loopback audio device for use with dl-fldigi
[08:34] <RPF-JR> but I don't understand what that code is doing? If done wrong I could damage hardware?
[08:34] <Darkside> not really sure how to do that
[08:34] <Darkside> no, you wont damage anything
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[08:34] <Darkside> it just wont work
[08:35] <RPF-JR> Right ok, only I seem to have a busted airspy
[08:35] <Darkside> it wouldnt have been because of running anything like that
[08:35] <RPF-JR> right okay
[08:35] <Darkside> i take it you have another machine you can try it in?
[08:36] <Vaizki> that will basically flood raw audio data to your terminal.. you still need to pipe it somehow to dl-fldigi I'd say
[08:36] <Darkside> Vaizki: nah, it pipes it into mplayer
[08:36] <Vaizki> oh so it does
[08:36] <Darkside> the - on the end is the mplayer input file
[08:36] <Vaizki> my bad
[08:37] <RPF-JR> yeah and I can't get fl-digi to compile on my main linux machine to test
[08:37] <RPF-JR> compiles fine on the pi
[08:37] <Darkside> but yes, i expecr you'd need to pipe it into aplay or something, and use the alsa loopback device
[08:37] <Darkside> RPF-JR: what distro?
[08:37] <Darkside> you may be able to get a packaged version of mainline fldigi to test with
[08:38] <Darkside> at least to get a waterfall display up at lease, even if it doesnt have the uploading to habhub features
[08:38] <daveake> Does the regular fl-digi have the port output for decoded data, or is that a dl- thing ?
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[08:39] <Darkside> daveake: regular has it
[08:39] <Darkside> thats how flarq works
[08:39] <RPF-JR> 1 sec, have a screaming baby here
[08:39] <daveake> cool, in that case this would be fine for RPF-JR
[08:39] <AndyEsser> RPF-JR: up the squelch
[08:39] <AndyEsser> :)
[08:39] <daveake> hah
[08:39] <daveake> if only (I imagine)
[08:40] <Vaizki> it's far worse when you suddenly realize the baby has been quiet for 20 minutes but is not sleeping
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[08:48] <AndyEsser> uh oh
[08:57] <AndyEsser> http://www.radioworld.co.uk/hb9cv-70_70cm_2-element_beam?query=70cm%20beam
[08:57] <AndyEsser> this looks a little too small...
[09:01] <mfa298> I think the HB9CV design is fairly compact due to how it works
[09:02] <AndyEsser> Yea, it's only 30cm long
[09:02] <AndyEsser> tbf, I only want directionality rather than massive gain
[09:02] <AndyEsser> so should do the trick for some simple DFing
[09:02] <craag> directionality is gain :P
[09:02] <AndyEsser> althought "direct connection to variable capacitor"
[09:02] <AndyEsser> craag: as a side effect
[09:03] <AndyEsser> I could get an omni antenna, cover 350 degrees of it in 10" lead
[09:03] <AndyEsser> it'd be directional, but wouldn't really gain much :P
[09:03] <mfa298> this explains it a bit. http://www.qsl.net/dk7zb/HB9CV/Details-HB9CV.htm
[09:04] <AndyEsser> mfa298: ta
[09:05] <mfa298> I think someone talked about using a hb9cv antenna for df, but using the nulls for position instead of the peaks.
[09:06] <AndyEsser> interesting
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[09:11] <RPF-JR> and back :-)
[09:12] <RPF-JR> So I have airspy_rx command running, pavucontrol running and fldigi too
[09:12] <AndyEsser> mfa298: might grab that then and use it for DFing
[09:12] <RPF-JR> can't see any activity in pavucontrol
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[09:34] <RPF-JR> right got something
[09:34] <RPF-JR> airspy_rx -r /dev/stdout -a 1 -f 434.250 -g 18 |csdr convert_u8_f | csdr shift_addition_cc `python -c "print float(145000000-144400000)/2400000"` | csdr fir_decimate_cc 50 0.005 HAMMING | csdr bandpass_fir_fft_cc 0 0.1 0.05 | csdr realpart_cf | csdr agc_ff | csdr limit_ff | csdr convert_f_s16 | mplayer -cache 1024 -quiet -rawaudio samplesize=2:channels=1:rate=48000 -demuxer rawaudio
[09:34] <RPF-JR> captures USB
[09:34] <RPF-JR> i think
[09:34] <RPF-JR> :-)
[09:36] <michal_f_off> RPF-JR: how is CSDR audio quality compared to anything else?
[09:36] <michal_f_off> for me it's much worse than on SDR#
[09:36] <RPF-JR> not fantastic
[09:37] <prog> csdr convert_u8_f <- remove this
[09:37] <RPF-JR> and payload is currently connected direct over SMA
[09:38] <craag> erm transmitter directly into receiver?
[09:38] <prog> poor airspy
[09:38] <RPF-JR> prog: that stops it working
[09:39] <RPF-JR> craag: not good?
[09:39] <craag> not good
[09:39] <RPF-JR> how come?
[09:40] <craag> the receiver is designed for receiving signals at least ~1000 times weaker (at maximum) than if it was connected direct.
[09:40] <craag> with some receivers that could cause permanent damage
[09:40] <prog> RPF-JR: remove it and add -t 0 to airspy_rx
[09:41] <craag> disconnect it and in proximity you should still be getting a signal (yes it's that sensitive)
[09:42] <RPF-JR> I do have a broken airspy here :-S
[09:42] <RPF-JR> what did -t 0 do, sounds weird
[09:42] <prog> airspy_rx -t 0 -r /dev/stdout -a 1 -f 434.250 -g 18 | csdr shift_addition_cc `python -c "print float(145000000-144400000)/2400000"` | csdr fir_decimate_cc 50 0.005 HAMMING | csdr bandpass_fir_fft_cc 0 0.1 0.05 | csdr realpart_cf | csdr agc_ff | csdr limit_ff | csdr convert_f_s16 | mplayer -cache 1024 -quiet -rawaudio samplesize=2:channels=1:rate=48000 -demuxer rawaudio
[09:42] <prog> you broke your airspy?
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[09:43] <prog> -t 0 AND remove csdr convert_u8_f
[09:43] <RPF-JR> I have 2 prototype mini and production
[09:43] <prog> how come you have a prototype?
[09:43] <michal_f_off> what does shift_addition_cc (145000000-144400000)/2400000 does exaclty ?
[09:44] <RPF-JR> production 1 got really hot and no longer works
[09:44] <RPF-JR> :-(
[09:44] <RPF-JR> youssef from airspy sent me one a while back
[09:45] <michal_f_off> :]
[09:45] <RPF-JR> lots of noise now
[09:46] <RPF-JR> airspy_rx -t 0 -r /dev/stdout -a 1 -f 434.250 -g 18 |csdr shift_addition_cc `python -c "print float(145000000-144400000)/2400000"` | csdr fir_decimate_cc 50 0.005 HAMMING | csdr bandpass_fir_fft_cc 0 0.1 0.05 | csdr realpart_cf | csdr agc_ff | csdr limit_ff | csdr convert_f_s16 | mplayer -cache 1024 -quiet -rawaudio samplesize=2:channels=1:rate=48000 -demuxer rawaudio -
[09:46] <prog> ah you are James
[09:46] <prog> "we are they"
[09:47] <prog> OK
[09:47] <prog> imo, just remove csdr shift_addition_cc `python -c "print float(145000000-144400000)/2400000"`
[09:47] <prog> there's no DC offset in airspy to be avoided
[09:48] <michal_f_off> thanks
[09:48] <RPF-JR> ahh this example adapted from rtl-sdr line
[09:48] <prog> yes
[09:49] <prog> the SSB receiver
[09:49] <RPF-JR> much better
[09:49] <RPF-JR> now to try on pi
[09:49] <RPF-JR> thanks all
[09:50] <prog> you are welcome
[09:50] <prog> I am Youssef btw..
[09:50] <Vaizki> :)
[09:50] <RPF-JR> prog: do you think i've busted my other airspy
[09:50] <prog> I don't know
[09:50] <RPF-JR> hi youssef
[09:50] <RPF-JR> :-)
[09:50] <RPF-JR> thanks for all the previous hrlp too
[09:50] <Vaizki> so how much power did you put into it..
[09:51] <prog> np, you are welcome
[09:51] <prog> Vaizki: must be a few tens of mW
[09:51] <RPF-JR> connected pits+ direct
[09:51] <Vaizki> eeps
[09:51] <RPF-JR> 10mW?
[09:52] <prog> 10mW is still OK
[09:52] <prog> try another unit with an antenna
[09:52] <prog> never connect a transmitter to a receiver directly
[09:52] <RPF-JR> ok :-S
[09:53] <RPF-JR> i'll try another when back in office
[09:53] <RPF-JR> took prod model out of case
[09:53] <Vaizki> it's like drinking from a fire hose
[09:53] <prog> so you get some sound?
[09:53] <RPF-JR> power light comes on, but never detected
[09:53] <Vaizki> instead of spraying water into the sky and letting everyone collect drops on their tongue..
[09:53] <RPF-JR> yeah clear sound
[09:54] <prog> all that was missing in the command I suggested is "-t 0"
[09:54] <prog> you should be fine
[09:54] <RPF-JR> odd stutter on RTTY, noticed before on yupitera, i'll ry decoding
[09:55] <prog> now you need to send the audio to fldigi
[09:55] <RPF-JR> got that working on laptop
[09:55] <RPF-JR> got to go, baby crying...
[09:55] <prog> oki
[09:55] <prog> good luck with the pi setup
[10:18] <SpacenearUS> New vehicle on the map: 03QM-SkyPi-2 - 12http://tracker.habhub.org/#!qm=All&q=QM-SkyPi-2
[10:26] <SpacenearUS> New vehicle on the map: 03QM-SkyPi-1 - 12http://tracker.habhub.org/#!qm=All&q=QM-SkyPi-1
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[10:28] <Gaz> Hi - Where do I go to get docs approved?
[10:28] Nick change: Gaz -> Guest22120
[10:29] <Geoff-G8DHE> #habhub post the Flight doc id and ask for approval, make sure its been tested
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[10:29] <Guest22120> Thanks.
[10:34] <Upu> hey RPF-JR about ?
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[10:49] <RPF-JR> brefly
[10:50] <RPF-JR> Upu: nipping to shop with kids brb
[10:51] <Upu> nps mailed you
[10:51] <Upu> tl;dr tommorrow
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[11:24] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[12:05] <michal_f_off> does the predict algorithm takes the fact that descent rate is very high at the beginning ? I'd guess it does take that into consideration ?
[12:10] <adamgreig> it does yes
[12:10] <adamgreig> it models atmospheric drag and backs out a drag coefficient from your provided sea level descent rate
[12:10] <adamgreig> (well CdA anyway)
[12:11] <michal_f_off> for the first time I graphed descend speed from my flight, and it was ~65 m/s just after burst. quite fast
[12:11] <adamgreig> yes
[12:11] <adamgreig> there is very little atmosphere
[12:12] <michal_f_off> and what is 'Speed' as reported by uBlox modules. is it horizontal speed ?
[12:12] <Darkside> yes, speed over ground
[12:12] <michal_f_off> because max uBlox speed value matches with max descend Value
[12:12] <michal_f_off> so max horizSpeed was at 11500 altitude...
[12:16] <daey> thats not really fast. i thought the payload would fall significantly faster, considering how fast the google/redbull guys were when they jumped
[12:20] <michal_f_off> www.cgarea.com/ARY1-VerticalSpeed.svg
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[12:23] <x-f> michal_f_off, will you transmit SSDV too, or just 300 baud telemetry?
[12:24] <SM0ULC-Reb> ello
[12:24] <michal_f_off> SSDV too
[12:24] <michal_f_off> I hope
[12:24] <michal_f_off> last time i plugged camera wrong way :/
[12:25] <michal_f_off> spend 3 weeks tweaking camera software, plug it upside down on the launch day
[12:25] <AndyEsser> michal_f_off: it wasn't wrong... just had it's Up defined different relative to normal Up
[12:25] <AndyEsser> :)
[12:25] <michal_f_off> sounds perfeclty for wiki "how to loose tyour flight"
[12:26] <michal_f_off> not much of a comfort :)
[12:26] <x-f> there is no "up" in spaaaaaace :)
[12:27] <michal_f_off> there must be somewhere...
[12:27] <michal_f_off> we just haven't found it
[12:28] <daveake> daey Redbull/Google were heavy men with (initially) no parachute; these are light and not very dense payload boxes with parachutes
[12:30] <x-f> 300 baud will be tough for me with such distance, but anyway - challenge accepted
[12:31] <michal_f_off> where are you based, x-f ?
[12:31] <x-f> i'm in Latvia
[12:31] <michal_f_off> quite a distance from me, yes
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[13:05] <SpacenearUS> New vehicle on the map: 03ARY-2 - 12http://tracker.habhub.org/#!qm=All&q=ARY-2
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[13:13] Nick change: Ulysses -> UliEAd
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[14:04] <OZ1SKY_Brian> hi. Does SP5RZP have another tx than APRS?
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[14:11] <michal_f_off> SP5RZP is a vaisalla radiosonde
[14:12] <michal_f_off> it is uploaded to APRS through a script for sondemonitor
[14:13] <michal_f_off> it's on 404.5 MHz AFAIR
[14:17] <UliEAd> UK question, I realise that it is illegal to run a radio beacon inside the balloons whilst it is in the air. However if I could rig a beacon to only activate when the payload hits the ground would it then become a legal unmanned opperation beacon?
[14:18] <mfa298> I think there are still some rules about unattended / beacon operation.
[14:18] <fsphil> it's not illegal to run a radion beacon, you are just limited to certain frequencies and certain power levels
[14:19] <mfa298> have a read through your license docs, it should all be there
[14:23] <gonzo__> in practice, you would have to have a separate beacon TX. As you can't run one on 70cms
[14:24] <gonzo__> also there are restricted locations where you can't run them. So you would have to add geofencing
[14:24] <AndyEsser> "What frequency can't you broadcast on within 100m of Charing Cross"
[14:24] <AndyEsser> *sigh*
[14:24] Action: AndyEsser has been reading too many mock Foundation exams
[14:25] <gonzo__> and all the beacoin/repeattres have shutdown requirements
[14:26] <UliEAd> does a limited battery life count?
[14:26] <gonzo__> so you woudl need to be sure it will land somewhere that you can command it off
[14:26] <gonzo__> you could poss wiggle around on that? It's not long though. So it would reduce the usefullness
[14:27] <UliEAd> 2 hours I think
[14:27] <gonzo__> you are better to have a good chase car system and follow it
[14:27] <gonzo__> and get the best fix as it nears the ground
[14:27] <UliEAd> car chase system?
[14:27] <gonzo__> that will get you within rx distance in most cases
[14:28] <UliEAd> Do you mean the use of those low power unlicensed radios
[14:28] <gonzo__> chase car, the vehicle you follow and recover
[14:28] <gonzo__> with
[14:29] <UliEAd> So what would the radio I am following be, to remain legal?
[14:29] <mfa298> UliEAd: most UK people use an ISM radio on their payload that provides data throughout the flight
[14:30] <gonzo__> your options are limited. But the good old 434mhx 10mW ones
[14:30] <mfa298> there are some ISM bands that allow airborne use. The Amateur radio license doesn't allow AR use airborne hence no APRS
[14:30] <UliEAd> Will I be in range of the ISM radio then if I follow the balloon?
[14:31] <gonzo__> if you are on the ball, you can chase a balloon and stay with it. So you are in place to get the last packets as it lands
[14:31] <mfa298> if you use one of the setups described on the wiki, 10mW rtty at 50/300 baud is common around 434MHz, the reception record for that is something like 800KM.
[14:31] <gonzo__> if it is in mainland uk, the rest of the tracking stations will get it down to a few 100mtrs
[14:32] <gonzo__> if it goes off into the hills/scotland/etc, then you may want to be following closly to be sure to have an rx station close
[14:32] <gonzo__> and if you want to recover it, you are already there
[14:33] <UliEAd> We are not in Scotland so should be fine.
[14:33] <UliEAd> Sounds like good fun
[14:33] <gonzo__> the balloon could be, depending on the winds/fil
[14:34] <UliEAd> why, how far can these things go (I'm near Cambridge).
[14:34] <gonzo__> suggest you get some rx gear together, or find someopne locally with some, and follow one of the other 434mhz flights
[14:34] <gonzo__> i think 7 times around the world is the record so far?
[14:35] <UliEAd> well... I don't have the money to recover it if that happens :)
[14:35] <AndyEsser> UliEAd: A flight launched from near Cambridge last weekend ended up in the Shropshire hills
[14:35] <gonzo__> near cambs, you should watch for a launch announcement on the mail group and ask the people if you can come and spectate. See what it's about
[14:35] <mfa298> UliEAd: have a play on http://predict.habhub.org/ to get an idea where it would go with the current winds
[14:36] <gonzo__> the flight depends on winds, balloon size, amount of gas, luck
[14:36] <mfa298> 5m/s is the standard ascent/descent rate and 30-40km altitudes are common
[14:36] <UliEAd> I see
[14:37] <gonzo__> I usually just build a cheap tracking beacon (434MHz) and let it go. Not bothering to chase or recover
[14:37] <gonzo__> just for the funb of it
[14:38] <mfa298> I'd also have a read through some of the wiki and search out some blogs abotu what other people have done
[14:38] <UliEAd> so long as it dosn't go in the sea
[14:39] <gonzo__> that is why you run the predictions
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[14:39] <mfa298> There's always a chance of that, but you can choose not to launch if that's likely
[14:39] <gonzo__> and on the day you can abort, or put more gas in (quicker accent so it bursts earliert)
[14:40] <UliEAd> I see
[14:40] <gonzo__> don't launch anything you can't afford to lose. Even if it comes down on land, it could be in a tree/pond/garden where someone won't let you recover it
[14:41] <mfa298> UliEAd: have a play with the predictor, for instance using defaults (30km) launching now from cambridge would put you right on the norfolk coast, but if you went to 40km (down to balloon and payload weight) it would be further inland
[14:41] <gonzo__> my beacons cost me £50 to build, and they don't have to go far for it to cost more in fuel than it's worth.
[14:42] <gonzo__> so I don't even bother recovering, just give them their freedom
[14:42] <mfa298> and launching tomorrow to 40km would put it into suffolk.
[14:42] <gonzo__> but often other people tracking may go out and see if they can recover them
[14:43] <gonzo__> so you sometimes get them back
[14:44] <gonzo__> cambs is a popular place to launch. So you are well placed to go and see what others are doing
[14:45] <UliEAd> What are your beacons that cost £50
[14:45] <gonzo__> a licenec exempt 10mW tx (£20), gps rx board (£20), a PIC (£5) and some batts
[14:46] <gonzo__> hung under some foil or slmall latex balloon, and some He balloon gas
[14:47] <gonzo__> released in poole, I've had them land in Stroud, Reading and Ely.
[14:48] <gonzo__> and a couple that got caught in trees locally, but that's all part of the learning curve
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[14:54] <OZ1SKY_Brian> michal_f_off thanks for the info
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[15:10] <SA6BSS-Mike> UliEAd: u can easely put a tracker together for under 20punds if you make your own pcb and build like 5 of them
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[16:23] <SpacenearUS> New vehicle on the map: 03KE0GEO-13 - 12http://tracker.habhub.org/#!qm=All&q=KE0GEO-13
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[16:33] <SpacenearUS> New vehicle on the map: 03KE0GEO-11 - 12http://tracker.habhub.org/#!qm=All&q=KE0GEO-11
[16:35] <SpacenearUS> New position from 03KE0GEO-12 after 037 days silence - 12http://tracker.habhub.org/#!qm=All&q=KE0GEO-12
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[17:03] <SpacenearUS> New vehicle on the map: 03ve5bnc_chase - 12http://tracker.habhub.org/#!qm=All&q=ve5bnc_chase
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[17:21] <Laurenceb__> the saga never ends https://twitter.com/rfmwguy/status/748157828951572481/photo/1
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[17:41] <SpacenearUS> New vehicle on the map: 03KG5JUT - 12http://tracker.habhub.org/#!qm=All&q=KG5JUT
[17:42] <SpacenearUS> New vehicle on the map: 03NSR-L - 12http://tracker.habhub.org/#!qm=All&q=NSR-L
[17:48] <mattbrejza> didnt even bother cropping out the remainder of the excel window...
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[18:04] <Laurenceb__> the answer to whats happening is simple
[18:04] <AndyEsser> Pixies
[18:04] <Laurenceb__> heating the magnetron decreases its magnetic field strength
[18:04] <Laurenceb__> so the torque from the system interacting with earths magnetic field changes with temperature
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[18:07] <PE2BZ> !flights
[18:07] <SpacenearUS> 03PE2BZ: There are no flights currently :(
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[18:14] <fsphil> PE2BZ: nice view
[18:15] <PE2BZ> Thanks. Now hoping that the next image shows a different one....
[18:15] <PE2BZ> I am not good in modyfing C but now I emulated /dev/video and have it fed with a jpg :-)
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[18:19] <PE2BZ> fsphil my camera is the white one, left bottom on this image: https://goo.gl/photos/cX36D2S1V9zRVVDE9
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[18:39] <SpacenearUS> New vehicle on the map: 03NSR-P - 12http://tracker.habhub.org/#!qm=All&q=NSR-P
[18:39] <AndyEsser> http://imgur.com/gallery/VrlB7
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[18:47] <fsphil> yes but jarjar
[18:48] <AndyEsser> I... had less of a problem with JarJar than midichlorians
[18:49] <fsphil> yes. the force was an infection
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[19:03] <NSR_> Hi, can anyone authorise flight doc ID 978b8f28f5f6f97166a814eb110f36a7 ? Thanks!
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[19:11] <daveake> Try asking in #habhub
[19:13] <NSR_> Thanks, I did. I pasted it in here by accident :)
[19:14] <daveake> ah yeah I see now
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[19:22] <Ian_> Andy making a 3 to 5 ele yagi with elements from tape measure purchased at £oundland should be a better idea.
[19:22] <Ian_> It will engage your active spirit for a few minutes more and give you the added risk of bleeding to death on sharp edges.
[19:23] <Ian_> That's a lot of excitement for £1 and lots of tape measure left
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[20:35] <michal_f> how is dl-fldigi forking with GPS under windows ?
[20:35] <michal_f> does it make sense to buy external receiver?
[20:37] <mfa298> michal_f: it doesn't work on windows
[20:37] <mfa298> I think the gps feature only works on linux and possibly mac
[20:38] <michal_f> i suspected that :(
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[20:48] <mfa298> chances are it's not that hard to fix, but building dl-fldigi for windows is a pain
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[21:02] <michal_f> usually building smth with c++ is a pain
[21:03] <mfa298> c++ isn't the problem, it's gettign the right combination of libraries and cross compiling everything
[21:08] <michal_f> thats part of language problem i would say
[21:08] <michal_f> but 100% agree
[21:20] <fsphil> if you try to abstract it too much you end up with java
[21:20] <fsphil> and nobody wants that
[21:26] <daveake> the horrrrrror
[21:27] <fsphil> virtual insanity
[21:33] <mfa298> that's a track I've not heard in a while.
[21:33] <michal_f> actually I heard it this morning driving to work
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[21:46] <AndyEsser> fsphil: *glares*
[21:46] <AndyEsser> michal_f: do you specifically need it for dynamic GPS?
[21:51] <AndyEsser> Ian_: yea, I do want to do more construction myself
[21:52] <michal_f> just asking out of curiosity
[21:53] <michal_f> i was thinking of getting a gps receiver anyway
[21:53] <michal_f> and finding some offline nav application
[21:53] <AndyEsser> ah ok
[21:53] <AndyEsser> if it's just a stationary listening position, stick your QTH into it instead
[21:53] <AndyEsser> if you're doing tracking on the go, I'd recommend a chase car app for android/iOS for a phone/tablet
[21:55] <michal_f> well I only have airspies currently, so it involves PC anyway
[21:55] <michal_f> i need to find some SSB capable handheld scanner, but they're expensive
[21:56] <AndyEsser> Yea :(
[21:56] <AndyEsser> I use my laptop both for home tracking, and the one time I went to go find a payload
[21:56] <AndyEsser> but as I rarely have data connection in the field, and therefore can't upload to habitat, I'm not too fussed about the GPS
[21:56] <AndyEsser> :)
[21:56] <fsphil> embedded ssb rtty decoder should be possible with current microcontrollers
[21:57] <AndyEsser> fsphil: now there's a fun side project...
[21:57] <fsphil> mmm
[21:57] <michal_f> way above my skills
[21:57] <fsphil> been thinking about it for a while, but it's probably too big for me
[21:57] <AndyEsser> although, might just cheat, RPi + RTL SDR + 7" DVD player touchscreen
[21:57] <AndyEsser> but that's way down the line
[21:58] <AndyEsser> got my own flavour of dl-fldigi to finish first :)
[21:58] <fsphil> I've got a dual ADC input on my dev board to play with the idea. IQ input > demodulator
[21:58] <michal_f> opensourced c++ lib for RTTY would be nice
[21:58] <AndyEsser> michal_f: what would you feed into it? the IQ signal? Or the audio from SDR# etc?
[21:59] <michal_f> I could use csdr to demodulate and pipe that into RTTY modem
[21:59] <fsphil> you''d want both options for a library
[21:59] <AndyEsser> fsphil: true, but IQ isn't as simple :P
[21:59] <fsphil> it's not that bad
[22:00] <AndyEsser> my version of fldigi will be a C++ lib to start with that just takes the audio from a specified audio input device
[22:00] <AndyEsser> and build a UI on top of that if needed
[22:00] <AndyEsser> then I'd like to dig into IQ stuff
[22:00] <fsphil> fldigi's rtty demod is just a filter and level tests
[22:00] <michal_f> AndyEsser, any timeframe for first release? :)
[22:00] <fsphil> it's quite simple
[22:01] <AndyEsser> Annoyingly spent ages just trying to write a loader for WAV so I could have test input..
[22:01] <AndyEsser> michal_f: nope, sorry
[22:01] <AndyEsser> but it will be open source
[22:01] <AndyEsser> fsphil: sure, but I wanted to make some reasonably modular/extensible so you could easily just write a class that represented another modem and write your won for it etc if needs be
[22:01] <AndyEsser> none of this is complex, just takes time
[22:02] <mfa298> I keep wanting to try decoding rtty with GRC/rtlsdr libs/ hackrf libs
[22:02] <fsphil> that's what fldigi tried to do
[22:02] <AndyEsser> s/won/own
[22:02] <AndyEsser> fsphil: yes, but wasn't it originally written by HAMs?
[22:02] <AndyEsser> :P
[22:02] <fsphil> yeah, still is
[22:02] <mfa298> but I think that means sitting down for a few days learning about IQ demods
[22:02] <AndyEsser> in the same way that software shouldn't be written by academics
[22:02] Action: AndyEsser lights blue touch paper and steps well back
[22:02] <fsphil> sdr# is pretty good software written by hams :)
[22:03] <AndyEsser> mfa298: Yea, I had a paper open in a tab about IQ signals the other month, it finally got bookmarked and closed when I realised I didn't have the time
[22:03] <AndyEsser> fsphil: it has its uses
[22:03] <AndyEsser> but it's bloaty
[22:03] Action: AndyEsser realises he should be careful what he says
[22:03] <AndyEsser> SDR# is actually perfect and I've had no issues with it
[22:03] <AndyEsser> I just like writing code, and fully understanding a process
[22:04] <fsphil> same
[22:04] <AndyEsser> Eventually I would love to run my own completely custom stack for receiving signal, decoding, and then pushing to habitat (and my own map system as well)
[22:04] <AndyEsser> https://twitter.com/LeadHyperion/status/710076513278885888/photo/1
[22:05] <AndyEsser> the iea behind this CLI UI for an RTTY modem was that I can just SSH into a server, piping the audio, and it runs anywhere, no dependencies etc
[22:05] <mfa298> I'd quite like doing something that's fairly automatic like matt's java decoder that could run on the Pi and track a few payloads.
[22:06] <fsphil> yeah I love that it autoconfigures. it's black voodoo magic
[22:06] <AndyEsser> heh
[22:06] <AndyEsser> anyway, bed time for me
[22:06] <AndyEsser> night all
[22:06] <mfa298> With an rtlsdr / hackrf and the 25 payload flight a few weeks back something like that could have been useful
[22:06] <michal_f> I have odroid XU4 collecting dust. I hoped I could make a portable airspy decoder/map display with it
[22:06] <michal_f> but it appeared to be harder that I expecteed
[22:07] <fsphil> niiite
[22:07] <michal_f> bye AndyEsser
[22:07] <mfa298> michal_f: rtl_fm and dl-fldigi might do something on that sort of device with an rtlsdr stick
[22:07] <fsphil> little command line app that connects to an sdr service
[22:08] <michal_f> i'll get back to it in near future
[22:08] <mfa298> I did that sort of setup on a Pi1 but with the java decoder, seemed to work with a payload sittign a few meters away (never tried it on a weak signal)
[22:08] <michal_f> is this java decoder opensouirced ?
[22:10] <mfa298> not sure, you'de need to talk to mattbrejza
[22:10] <michal_f> ahh ok
[22:12] <mattbrejza> see github
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[22:13] <michal_f> " a stand alone pc decoder is a planned project"
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[23:06] <PH3V> !flights
[23:06] <SpacenearUS> 03PH3V: There are no flights currently :(
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[23:33] <prog> <fsphil> sdr# is pretty good software written by hams :) <- hams?
[23:33] <prog> what hams?
[23:34] <hosler> all hams
[23:35] <prog> SDR# is the anti-thesis of amateur radio
[00:00] --- Thu Jun 30 2016