highaltitude.log.20160123

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[00:42] <SpacenearUS> New vehicle on the map: 03CADICA - 12http://tracker.habhub.org/#!qm=All&q=CADICA
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[00:53] <Lunar_Lander> good night :)
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[00:56] <Ian_> Good night Kevin
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[03:35] <SpacenearUS> New position from 03HORUSLORA after 0325 days silence - 12http://tracker.habhub.org/#!qm=All&q=HORUSLORA
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[04:39] <SpacenearUS> New vehicle on the map: 03VE6LAU-11 - 12http://tracker.habhub.org/#!qm=All&q=VE6LAU-11
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[07:18] <SpacenearUS> New vehicle on the map: 03AX5ARG-1 - 12http://tracker.habhub.org/#!qm=All&q=AX5ARG-1
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[08:44] <R6mco> Oddstr13: PS-58 above Haiti now, moves eastwards, so you must be able to RX it soon
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[09:32] <AndyEsser> morgen
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[10:17] <SpacenearUS> New position from 03HORUSLORA after 037 hours silence - 12http://tracker.habhub.org/#!qm=All&q=HORUSLORA
[10:18] <SpacenearUS> New vehicle on the map: 03VK5QI_chase - 12http://tracker.habhub.org/#!qm=All&q=VK5QI_chase
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[10:43] <SpacenearUS> New vehicle on the map: 03VK5ZM_chase - 12http://tracker.habhub.org/#!qm=All&q=VK5ZM_chase
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[10:59] <SpacenearUS> New vehicle on the map: 03hr_v_chase - 12http://tracker.habhub.org/#!qm=All&q=hr_v_chase
[11:00] <russss> https://www.youtube.com/watch?v=74tyedGkoUc
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[11:17] <PE2BZ> !flights
[11:17] <SpacenearUS> 03PE2BZ: There are no flights currently :(
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[11:41] <SpacenearUS> New position from 03CHIMP01 after 0315 hours silence - 12http://tracker.habhub.org/#!qm=All&q=CHIMP01
[11:43] <DutchMillbt_> PE2BZ?
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[12:09] <Oddstr13> R6mco: the furthest away signal I have ever received is a bit over 6000km, and that was with the rtl-sdr over a year ago
[12:11] <Oddstr13> the furthest away signal I got on wspr the other day was about 2500km, and I didn't manage to get a single trace yesterday, not sure why
[12:11] <Oddstr13> probably too much local rfi
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[13:06] <PE2BZ> DutchMillbt QRZ ?
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[13:13] <Ian_> So, what's in a name?
[13:13] <Ian_> they make the PINE A64 an open source platform, ready to be tweaked and loaded with your own OS flavour, though they suggest Ubuntu, Android or openHAB IoT to maximize app access (from the existing 1.7 million Android apps available today).
[13:13] <Ian_> http://www.electronics-eetimes.com/en/a-craving-for-cheap-64-bit-computing.html?cmp_id=7&news_id=222927221
[13:13] <Ian_> openHAB ?
[13:14] <PE2BZ> Home Automation image...
[13:23] <Ian_> Home Automation Bodge?
[13:25] <Ian_> Build your smart home in no time! Must have been good as they are touting openHAB2 now!
[13:26] <Ian_> The Nest smart thermostat had a bit of a bad day recently when an automatic update borked people's central heating options (didn't switch on) for a day or so. Brrrrr!
[13:26] <Ian_> That was in the USA I understand
[13:27] <mfa298> Oddstr13: remember that HF is a weird beast and conditions will vary with time of day, time of year, what the Sun's doing and various other factors.
[13:30] <AndyEsser> Ian_: Saw an article the other day about Nest revealing the locations of your home as well publically
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[13:35] <Ian_> It certainly gets better and better !
[13:37] <SpacenearUS> New vehicle on the map: 03CRAAG4 - 12http://tracker.habhub.org/#!qm=All&q=CRAAG4
[13:38] <AndyEsser> It's amusing the looks I was getting earlier
[13:38] <AndyEsser> sat in a pub, primarily full of rowers
[13:38] <AndyEsser> reading a book called "Concepts In Thermal Physics"
[13:40] Nick change: spe_ -> spe
[13:41] Nick change: spe -> Guest49824
[13:41] Nick change: Guest49824 -> pse
[13:43] Nick change: pse -> spe
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[14:49] <Oddstr13> mfa298: fully aware... also don't forget my "computer lab" :P
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[15:08] <pb0ahx> !flights
[15:08] <SpacenearUS> 03pb0ahx: There are no flights currently :(
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[15:11] <N2NXZ> Is PS-58 using both VK3ANH and VK3YT callsigns?One for JT9 and the other for WSPR?
[15:12] <N2NXZ> This morning I see a bunch like this - 0702 -21 -1.8 1707 @ VK3YT0C83CR60
[15:13] <SpacenearUS> New position from 03UBSEDS13 after 03a day silence - 12http://tracker.habhub.org/#!qm=All&q=UBSEDS13
[15:13] <richardeoin> ^ backlog points
[15:19] <Vaizki> nice fan :O
[15:20] <richardeoin> yep, the map doesn't seem to understand the date field
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[15:33] <SpacenearUS> New vehicle on the map: 03KD0HIP-7 - 12http://tracker.habhub.org/#!qm=All&q=KD0HIP-7
[15:35] <Laurenceb_> richardeoin: http://www.mouser.com/ds/2/396/capacitor03_e-587718.pdf
[15:35] <Laurenceb_> I wonder if you might be able to use on of those together with solar
[15:36] <Laurenceb_> dunno how well they work at low temp
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[16:26] <SpacenearUS> New vehicle on the map: 03K7GPS-12 - 12http://tracker.habhub.org/#!qm=All&q=K7GPS-12
[16:31] <richardeoin> lithium ion capactior
[16:31] <richardeoin> Laurenceb_: I'll have a look
[16:31] <richardeoin> 75mAh is reasonable
[16:34] <Laurenceb_> I get 120mAh equivalent from 3.8v to 2.2v with 270F
[16:35] <Laurenceb_> or ~260 at 1.45v
[16:37] <richardeoin> oh sure, I just assumed 1V range
[16:39] <richardeoin> but the current tracker runs entirely from a 1.8V bus, so maybe 2V range
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[16:40] <Laurenceb_> really needs a freezer test
[16:40] <richardeoin> yeah I'll grab a few for next time I'm using the cold chamber
[16:40] <richardeoin> week after next probably
[16:41] <richardeoin> the d/s says 10000 cycles?
[16:42] <richardeoin> at nominal temperature obviously
[16:42] <Laurenceb_> looks like it
[16:43] <Laurenceb_> so I get 15mA mean current on the 1.8v bus with 270F and 90% efficiency buck
[16:43] <Laurenceb_> for 12 hours overnight power
[16:43] <Laurenceb_> sounds feasible
[16:44] <richardeoin> yeah absolutely
[16:45] <richardeoin> I was thinking ~300mAh li-ion but de-rated to 100mAh or less because temperature and cycle issues
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[16:48] <Laurenceb_> yeah but it depends on the cell
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[16:48] <Laurenceb_> some of them basically stop working below -30C
[16:48] <richardeoin> that too
[16:48] <Laurenceb_> but some will still function at -60C
[16:50] <richardeoin> defineitly worth trying these though
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[16:56] <richardeoin> oh man 38 GBP each Laurenceb_ http://www.mouser.co.uk/ProductDetail/Taiyo-Yuden/LIC2540R3R8277/
[16:57] <richardeoin> suddenly I'm less keen
[16:57] <Oddstr13> hm... newest SDR# dosn't like HackRF particularly well it seems
[16:58] <Laurenceb_> heh
[16:59] <Oddstr13> have to replug every time after hitting the stop button
[17:10] <SA6BSS-Mike> I have 6F 2,7V , could run my tracker with rfm tx continius for about a minute
[17:12] <gurlavie> Hi, any recommendation for Arduino supplier on AliExpress ? There are so many and quality is probably a n issue. Tx!
[17:14] <craag> Anything on aliexpress isn't going to be genuine, and so may be questionable quality
[17:15] <Oddstr13> gurlavie: I buy mine from SFE or simmilar
[17:15] <Oddstr13> they arn't that expensive, after all
[17:15] <craag> If quality is a concern, just buy a genuine one from amazon/farnell or somewhere
[17:15] <Oddstr13> or just build my own boarduino, if that fills the project
[17:16] <Oddstr13> if you want cheap, just use the bare atmega328 chip
[17:17] <fsphil> or any of the other rather nice selection of atmega chips
[17:17] <Oddstr13> indeed
[17:19] <fsphil> gnuradio seems to have a similar problem with the hackrf
[17:19] <fsphil> it doesn't clean up after itself, leaves the radio RX'ing or TX'ing after hitting stop
[17:19] <fsphil> though don't need to unplug it
[17:20] <fsphil> so no that similar
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[17:25] <eroomde> Ian_: just finished your honey. thank you very much for that, it was excellent.
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[17:28] <Oddstr13> https://dl.dropboxusercontent.com/u/4306267/ShareX/2016/01/2016-01-23_18-28-10.png
[17:29] <Oddstr13> works sometimes it seems, but more often not
[17:30] <Oddstr13> also, any idea of what might be causing the 1kHz spaced interference?
[17:30] <eroomde> heh nice curtains Oddstr13
[17:31] <Oddstr13> yea, that's what I get after hitting start after stop
[17:31] <Oddstr13> updates once for each start, then I just get solid stripes
[17:33] <SA6BSS-Mike> itd othr (radar) on 10m
[17:33] <daveake> Does this happen regardless of what frequency range it's tuned to?
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[17:33] <SA6BSS-Mike> look at my grabber page http://www.qsl.net/sa6bss/
[17:33] <SA6BSS-Mike> *that 30m 10Mhz
[17:34] <Oddstr13> zoomed out some more https://dl.dropboxusercontent.com/u/4306267/ShareX/2016/01/2016-01-23_18-33-07.png
[17:34] <Oddstr13> gone at 20MHz looks like
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[17:35] <Oddstr13> I mean, still got simmilar interference, just not the constant 1kHz covering it all
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[17:40] <Oddstr13> hm.. seems it might be internal noise from the hackrf
[17:40] <daveake> Try changing the sample rate
[17:40] <Oddstr13> just did
[17:40] <daveake> ok
[17:41] <Oddstr13> pattern changed
[17:41] <Oddstr13> I'll go hook up the RTL-SDR I guess
[17:42] <Oddstr13> see if I get better reception with the experimental hf driver
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[17:42] <Oddstr13> oh, I have actually gotten some wspr thru the noise apparently
[17:43] <Oddstr13> got two spots from 20min ago
[17:51] <Miek> fsphil: i find it's fine if you close the flowgraph window rather than hitting stop in GRC
[17:51] <Oddstr13> heh, what's up with UBSEDS13's traces?
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[18:02] <fsphil> Miek: I've found running hackrf_info stops it
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[18:08] <Oddstr13> it it possible to extract the raw data from the tracker?
[18:09] <AndyEsser> There is apparently a REST API - but I can't remember the URL for the documentation
[18:11] <Oddstr13> found it
[18:13] <fsphil> now you can rest
[18:14] <Oddstr13> ah
[18:14] <AndyEsser> fsphil: :)
[18:15] <AndyEsser> fsphil: you have a terrible sense of humour... it amuses me :)
[18:17] <Oddstr13> it has periodicaly had no lock it seems
[18:18] <AndyEsser> o wow - that is a bit b0rked...
[18:21] <mfa298> AndyEsser: it's something that comes from being here too long,
[18:23] <Oddstr13> I actually don't see anything in the telemetry that could cause that mess tho
[18:25] <mfa298> I think someone tried importing backlog data for UBSEDS earlier which might be where some of that mess came from
[18:26] <Oddstr13> not present in the data I get from habitat
[18:27] <richardeoin> yep, the map doesn't interpret the date field correctly for UBSEDS
[18:27] <richardeoin> not sure why
[18:27] <richardeoin> but yes the actual data is fine
[18:28] <richardeoin> here's a small write-up of the flight http://www.bristol-seds.co.uk/hab/flight/2016/01/20/ubseds13.html
[18:28] <richardeoin> ^^ including some envelope photos Laurenceb_
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[18:32] <critcalmass> Evening all
[18:33] <critcalmass> My RTL-SDR turned up today... Huzzah!
[18:33] <critcalmass> Just home from announcing at the woking game so going to fire it up and give it a go.
[18:34] <critcalmass> Just need to work out what software is best for looking at airbourne wiggly amps.
[18:34] <SpacenearUS> New position from 03SP6NVB-11 after 0317 days silence - 12http://tracker.habhub.org/#!qm=All&q=SP6NVB-11
[18:35] <Laurenceb_> richardeoin: v interesting, I'll have a read
[18:35] <fsphil> critcalmass: on windows, probably sdr#
[18:36] <critcalmass> Nice one fsphil, I'll give it a go.
[18:39] <critcalmass> Considering I'm a qualified avionic engineer, this radio theory is testing my hungover brain tonight. /me tries to remember trade training :-)
[18:44] <SA6BSS-Mike> fsphil: did a comparison on sdrplay and a rtl-sdr last weekend, I think we talked about it 10 days ago https://www.youtube.com/watch?v=aAXW-QKm06U
[18:44] <SA6BSS-Mike> the are vrry similar
[18:45] <SA6BSS-Mike> my computer could not handle 2inst. of hd sdr and screen recoreder at the same time so the video is choppy
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[19:37] <Laurenceb_> richardeoin: wow just finished reading
[19:37] <Laurenceb_> 11.3g free lift is loads
[19:37] <Laurenceb_> that envelope design is awesome, should be possible to beat Leos design with the right payload
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[19:38] <Laurenceb_> also I think its possible to rule out any gas leaks, Leo had lots of issues with tiny seal leaks and pinholes, but never saw anything float for >10 hours that had a pinhole issue
[19:40] <Laurenceb_> in fact that envelope should be capable of beating the balloon flight duration record
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[19:46] <Lunar_Lander> evening
[19:52] <fsphil> howdy
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[20:11] <critcalmass> Chaps, sorry to be a bit of an idiot, but I'm having a play with my new RTL-SDR dongle and need some advice on the antenna.
[20:13] <critcalmass> At the moment I'm just using the whip that comes with it (which I'm sure is inadequate for most things) but don't know what length to make it. Supposing I'm tracking a HAB, does the antenna itself need to be 70cm?
[20:13] <critcalmass> Again, sorry about the stupid questions :-)
[20:21] <dbrooke> a whip is normally a quarter wave, but velocity factor means it actually should be a bit shorter, so 164mm according to https://ukhas.org.uk/guides:payload_antenna
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[20:23] <critcalmass> That's just the guide I couldn't find, thanks for the info. Much appreciated.
[20:23] <dbrooke> the supplied whip is for the TV band so is shorter than that
[20:23] <SpacenearUS> New vehicle on the map: 03VE6LAU-10 - 12http://tracker.habhub.org/#!qm=All&q=VE6LAU-10
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[20:30] <SA6BSS-Mike> you can solder on a piece of wire onto the littele whip so it gets to be 164mm
[20:32] <critcalmass> The little whip mine comes with is actually 200mm, so I've just shortened it.
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[20:35] <SA6BSS-Mike> they usuly comed with a 8-9cm whip
[20:36] <SA6BSS-Mike> http://www.rtl-sdr.com/measuring-the-swr-of-the-standard-rtl-sdr-whip-antenna/
[20:37] <SM0ULC-Reb> mine have been short for 434 mhz :/
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[20:40] <daveake> I forgot to trim the antennae on the 3 trackers for my last set of flights; they still worked well
[20:40] <daveake> approx 1cm too long
[20:42] <chris_99> is there a launch tommorow iirc?
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[20:44] <daveake> Some students flying one of craag's trackers, iirc
[20:44] <SA6BSS-Mike> 12:00 UTC from Coelbren, South Wales, UK
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[20:45] <chris_99> cool, cheers
[20:45] <SM0ULC-Reb> daveake: plans to upgrade the server-sw to receive multiple ssdv-packets? :)
[20:45] <daveake> what do you mean?
[20:46] <SM0ULC-Reb> daveake: so that you not have to thread inputs
[20:47] <daveake> erm, I've *added* threading for ssdv
[20:47] <daveake> ssdv packets go into a queue for uploading
[20:47] <daveake> so the main thread no longer gets blocked waiting for the uploads to complete
[20:48] <SM0ULC-Reb> right
[20:49] <daveake> it never really mattered for 434MHz SSDV as the packets don't come in fast enough, but it's different on 868 where there's more bandwidth available
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[21:03] <SM0ULC-Reb> daveake: whats the max speed you have tried with lora?
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[21:16] <daveake> 4 ssdv packets per sec
[21:17] <SM0ULC-Reb> 8kbit-ish then?
[21:18] <daveake> yeah about
[21:19] <gurlavie> critcalmass: which model did you buy?
[21:19] <daveake> it'll go faster
[21:20] <Vaizki> I have a theory of nanoscale black holes which swallow up expensive rf-adapters
[21:20] <daveake> at 4 packets/s it only ever buffers up 2 packets in my testing
[21:21] <daveake> so my 64-packet buffer is ample :)
[21:21] <daveake> (4 threads up to 16 each thread)
[21:21] <mfa298> Vaizki: not just expensive rf-adapters
[21:22] <Vaizki> I am looking at a pile of 28 adapters but of course there is no combination that will work in there..
[21:25] <gurlavie> Hi. Any special mechanism to stabilize a HAB payload ? I mean from spinning, for getting better images & video. Tx !
[21:26] <Vaizki> nothing simple
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[21:26] <Vaizki> well ok a momentum wheel is simple but not a simple job to fly one and control it...
[21:27] <mfa298> I think some people have used fishing swivels to reduce spinning but it wont stop all spinning
[21:28] <mfa298> longer cord between balloon parachute and payload will help reducing swinging
[21:29] <Vaizki> didn't someone fly a swivel and a stabilizing tail.. don't think it worked very well
[21:30] <mattbrejza> last time we wanted to reduce rotation we connected the two payloads together, but had them far apart
[21:30] <fsphil> some rotation will help with pictures. not so good with video though
[21:30] <gonzo_nb> choice of cordage helps, I understand
[21:30] <mattbrejza> so all the mass was at the outside
[21:30] <gonzo_nb> a braided type will be ledd likely to tris as you stretch it
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[21:31] <mattbrejza> eg: https://www.flickr.com/photos/104821768@N06/16252403603/in/album-72157651392083656/
[21:31] <SpeedEvil> You add a sticky out stick, and a paddle (or two) to reduce rotation too
[21:31] <SpeedEvil> ^can
[21:32] <SpeedEvil> or an elaborate cross-shaped kite thingy
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[21:40] <critcalmass> gurlavie: I picked up the dongle from RTL-SDR.com.
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[21:48] <gurlavie> Tx
[21:53] <critcalmass> Learning how to use SDR Sharp by cocking about with it. Steep learning curve. Thought I picked up some RTTY comms but it wasn't, so I've gone back to FM stations as subject matter for my training :-)
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[22:00] <fsphil> commercial FM is kinda the SDR's "Hello, World!"
[22:03] <mfa298> if your near a port / airport marine band / airband can be a good second step (or see if there are any local amateur radio repeaters - but they can be quiet most of the time)
[22:08] <gonzo_nb> getting an antenna outside will seriously help cut down on noise and increase the signals you will hear
[22:10] <gonzo_nb> even just a simple random length dipole, hung out of a window will help to start with
[22:10] <fsphil> does the rtlsdr driver support HF out of the box these days?
[22:10] <fsphil> I think it needed a hack before
[22:12] <SA6BSS-Mike> think you still have to ad that patched dll to get HF working
[22:13] <SA6BSS-Mike> http://www.rtl-sdr.com/direct-sampling-mode-hardware-modifcations/
[22:13] <SA6BSS-Mike> DIRECT SAMPLING MODE WITH NO HARDWARE MODIFCATION
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[22:52] <critcalmass> Ooooooo, ok. I'm relatively close to a number of airports (Farnborough, Heathrow etc) and can pick up loads of data transmitions around the 120MHz area. Is this likely to be IFF / SSR?
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[22:59] <MarkIreland> I do 'pip install *module*' on on RPi and it installs for 'python3' and not available for 'python' and I do exactly the same pip install command on the other RPi and it installs for 'python' and not for 'python3' - I get 'No module named...' for both occurrences respectively - why?
[23:01] <daveake> I've always had to run the Python3-specific pip
[23:02] <MarkIreland> pip3?
[23:02] <daveake> Python2 should just die it'd be a lot simpler
[23:03] <daveake> pip-3.3 or whatever
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[23:04] <MarkIreland> right ok, I'll try and target both to pip3. stupid that one defaults to python2 and the other python3. I think some pag
[23:05] <MarkIreland> *I think some packages have changed the default on one
[23:05] <MarkIreland> Thanks
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[23:51] <craag> Sorry about double-post - roundcube being weird with sent items.
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[00:00] --- Sun Jan 24 2016