highaltitude.log.20141017

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[02:48] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://habhub.org/mt/?focus=CALLSIGN123_chase
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[11:15] <Laurenceb> any gpsbabel users here?
[11:15] <Laurenceb> i was to extract all the info from a gpx file
[11:15] <ulfr> hm, a bit.
[11:15] <Laurenceb> not just lat long
[11:15] <Laurenceb> speed, temperature, tons of other stuff in my gpx file
[11:15] <Laurenceb> lol enging rpm too :P
[11:16] <Laurenceb> *engine
[11:16] <ulfr> And to what format are you converting it?
[11:16] <Laurenceb> its off a vehicle can bus
[11:16] <Laurenceb> csv
[11:16] <ulfr> ah, so csv > gpx ?
[11:16] <Laurenceb> no, other way around
[11:16] <Laurenceb> the gps is logged by the vehicle computer
[11:16] <Laurenceb> *gpx
[11:17] <Laurenceb> im trying to extract the data
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[11:18] <ulfr> I admit, that I didn't even realize that gpx can hold all that data...
[11:18] <Laurenceb> im not sure its supposed to....
[11:18] <ulfr> Yeah.
[11:18] <Laurenceb> maybe some awk/sed is called for
[11:18] <ulfr> but gpx is basically an xml file
[11:18] <Laurenceb> yeah
[11:18] <Laurenceb> in fact... matlab could read it
[11:18] <Laurenceb> lulz
[11:18] <ulfr> I think you might need to just make a script that searches the file and fetches the data
[11:18] <Laurenceb> yeah
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[11:19] <ulfr> afaik gpsbabel can't handle anything else than the standard information in it, but perhaps you could write a patch to it? :P
[11:19] <Laurenceb> heh
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[12:08] <Laurenceb> https://www.youtube.com/watch?v=rJwIhnFxuWQ
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[12:18] <SpacenearUS> New vehicle on the map: 03JOTA1 - 12http://habhub.org/mt/?focus=JOTA1
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[12:29] <mattbrejza> Laurenceb: http://www.bbc.co.uk/news/technology-29646423
[12:31] <Laurenceb> facepalm
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[12:51] <qyx_> is it possible to construct vertical dipole this way? http://www.alpharubicon.com/elect/images/vertdipoleniet2237.jpg
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[12:53] <qyx_> what would be the impedance?
[12:54] <qyx_> i mean, will it be affected somehow compared to dipole fed like this http://www.n4lcd.com/wireantennas/16-Vertical-Dipole-Antenna.jpg
[12:54] <craag> That would be ~50 ohms
[12:54] <qyx_> not ~70?
[12:55] <craag> sorry yes 70
[12:55] <craag> the first one uses the dipole sleeve as an effective sleeve balun
[12:55] <craag> the second one there doesn't have a balun
[12:55] <craag> :(
[12:55] <qyx_> so the first one might have different impedance?
[12:56] <craag> Well the second one is not a good antenna
[12:56] <craag> the first one is a classic dipole
[12:57] <craag> I've seen a lot of the first one in 2.4ghz antennas
[12:58] <qyx_> ok, i will make one and try how it compares to 1/4 ground plane antenna
[12:59] <gonzo_> the mismatch on a 70R dipole connected to 50r coax is not going to have any real effect
[12:59] <gonzo_> VSWR of less thatn 1.5:1
[13:00] <craag> eg http://i.ytimg.com/vi/bs8hvXGJdhM/0.jpg
[13:00] <craag> So the dipole bit is the bottom, with a phasing loop and stacked 1/2 wave on the top
[13:01] <craag> all 2.4ghz 5dBi antennas I've seen are like that
[13:08] <Laurenceb> ive flown similar
[13:09] <Laurenceb> ~16cm long unshielded coax core
[13:09] <Laurenceb> for 434mhz
[13:10] <mfa298> you can in theory make them fairly simply by just folding back the coax braid over the top of the sleve
[13:10] <SpacenearUS> New vehicle on the map: 03manasa_chase - 12http://habhub.org/mt/?focus=manasa_chase
[13:10] <mfa298> but my attempts so far havn't been all that good - they work but not as effective as a more traditional dipole or ground plane antenna
[13:11] <Laurenceb> no need to do any fold
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[13:11] <Laurenceb> just strip off the end
[13:12] <Laurenceb> works fine for me
[13:12] <craag> Laurenceb: But then your phasing is out by 90 degrees?
[13:12] <qyx_> mfa298: yep, i will crimp 4mm brass tube over rg174
[13:12] <craag> would work maybe, but radiation pattern would not be dipole-like
[13:13] <Laurenceb> huh?
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[13:13] <qyx_> i mean fold back the shield and crimp tube over it
[13:14] <mfa298> I think with the way I did it one issue is that the velocity factor in the sleve section is different to the top section (more like 0.66 compared to 0.95) - although really needs a vna to test propery
[13:15] <SpacenearUS> New vehicle on the map: 03manu_chase - 12http://habhub.org/mt/?focus=manu_chase
[13:16] <Laurenceb> im very unconvinced
[13:17] <Laurenceb> just trim off the shield at the end
[13:17] <Laurenceb> you may need to tune the length a little
[13:19] <Laurenceb> the radiation pattern is possibly less useful for a HAB - more radiation will go upwards
[13:19] <Laurenceb> than if you have a ground plane
[13:20] <mfa298> If you're only trimming 1/4 wave of the shield that won't be a dipole, it's probably more like a GP using the coax as the ground plane
[13:20] <Laurenceb> also maybe more RF leaking back towards the electronics
[13:20] <Laurenceb> but you can fix that with a ferrite
[13:23] <craag> Do some mental modelling of currents and voltages.
[13:24] <craag> I can't see any way that could work with a ferrite over the shield
[13:24] <mfa298> the sleve dipoles the feed point is in (elecrically) the centre, with one leg being made with the coax centre, and the other leg being made from pipe, or the braid folded back (and the feeder running inside that leg)
[13:24] <gonzo_> mfa298, the sleeve section is in air, so vf of 0.95, the same as the other element
[13:26] <gonzo_> I'm not sure what the influence of the sleeve against the coax shield would be. But poractically, it's not significant enough to matter much
[13:27] <mfa298> I saw some bits that suggested it was a lower vf because of the coax shield and outer insulation.
[13:28] <mfa298> which might be more to do with using the braid and taking that back over the top of the coax so it's in contact
[13:28] <mfa298> could really do with a vna and some tests to see what the impact is of assuming different vf values.
[13:29] <gonzo_> vna will onbly give half the picture
[13:29] <gonzo_> you need to look at the radiation patern too
[13:30] <mfa298> agreed
[13:30] <gonzo_> changing the match will affect the I/V distribution and change the pattern
[13:31] <mfa298> my limited real world tests (assuming a lower vf seemed to suggest it was worse than a dipole so that could in part down to that leg being too short)
[13:32] <mfa298> I probably ought to try making one assuming a .95 vf and see it that works better.
[13:33] <mfa298> assuming 0.65 - 0.7 vf works nicely for that design as the larger diameter of the braid over the outer insulation shortens it by about that length.
[13:37] <gonzo_> there is a design for an 'autmoatic balun' where you feed the coax up throuygh the element of a folded dipole. That doed not change the dims of the dipole at all. Though in that case, the coax enters the element at the zero voltage point. So could change the model
[13:38] <gonzo_> modle
[13:38] <gonzo_> (never can get that word to look right)
[13:42] <gonzo_> buggered if I can find a picture of it thoughg. Check G8ADM's talk at CAT2012 on the BATC streamer
[13:42] <myself> if it's a simulation that changes states, it could be a modal model
[13:42] <craag> Yeah we used dave mann's design on our vhf nfd antennas
[13:43] <craag> worked well
[13:43] <craag> 1.0:1
[13:43] <craag> and reasonable scores of course :)
[13:43] <gonzo_> especailly if it was a 'field' marshall
[13:44] <gonzo_> I recently changed our 2mtr ants over from a nasty tonna thing (bit of wire wralled around a bit of ali strip) to a 1/2wave coax balun
[13:45] <craag> we did this because someone trod on the tonna one :P
[13:45] <gonzo_> but dave's warnungs abouyt reducing the bandwidth is not an issue for just the few 100khZ of the all mode sect of the band
[13:45] <gonzo_> best thing to happen to a btonna one!
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[13:45] <craag> oh yes, match was 1.7:1 or something once it was up the air the year before!
[13:46] <gonzo_> had a brief chat with him there vthis year, about the spacings req for adjusting for a match
[13:47] <craag> I missed out this year, will be oop norf next year though!
[13:47] <gonzo_> his method of bringing the DE up to D1, to reduce the Z of a folded dipole from 200r down to 50R to allow his auto banun (1:1) to work
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[15:17] <pc1pcl> !flights
[15:17] <SpacenearUS> 03pc1pcl: Current flights: 03PS-23 10.142Mhz OLIVIA 8/250 JT65 picoscape.net 10(0c7f), 03B-64 434.500 Contestia 64/1000 10(3afe), 03B-66 434.500 Contestia 64/1000 10(705b)
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[17:15] <OZ1SKY_Brian> hi
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[17:31] <Lunar_Lander> hello
[17:33] <Speedevil> http://www.diyphotography.net/drone-looses-contact-operator-activates-return-home-crashes-gopro4-rock/
[17:33] <Speedevil> hey
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[17:44] <OZ1SKY_Brian> ouch, going down
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[17:47] <fsphil> hah
[17:47] <fsphil> hey it survived
[17:47] <OZ1SKY_Brian> yep thats pretty good
[17:47] <arko> hahaha
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[17:47] <arko> Seppeku Drone
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[17:50] <LeoBodnar> I think I got wrongly credited for http://x-f.lv/dev/habitat-graphs/ on GPSL
[17:51] <LeoBodnar> x-f_: I am forwarding thanks to you then for great resource!
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[17:59] <x-f_> thanks :)
[17:59] Nick change: x-f_ -> x-f
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[19:11] <SpacenearUS> New vehicle on the map: 03JOTA1 - 12http://habhub.org/mt/?focus=JOTA1
[19:12] <chrisstubbs> Right all good for launch tomorrow
[19:12] <chrisstubbs> Can someone clear JOTA1 off the map tonight please?
[19:13] <fsphil> cleared
[19:14] <chrisstubbs> cheers phil
[19:16] <fsphil> anyone from Vortex on here? can I clear them of the map
[19:16] <OZ1SKY_Brian> chrisstubbs is JOTA tomorrow?
[19:16] <chrisstubbs> Yeah
[19:17] <OZ1SKY_Brian> ah ok great, will see if i can catch any of them.
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[19:27] <Rebounder> tension is increasing.. swedish military hunting subs just outside stockholm.. wonder when they will inspect balloons...
[19:29] <Laurenceb_> what sort of subs?
[19:29] <Laurenceb_> Russian?!
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[19:35] <Rebounder> Laurenceb_: probably not very huge.. russian subs have a history in these waters.. you might know u137?
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[20:01] <SpacenearUS> New vehicle on the map: 03VK3YT - 12http://habhub.org/mt/?focus=VK3YT
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[20:44] <qyx_> ok, that dipole behaves strange
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[20:45] <qyx_> i did it with 164mm and 173mm long 4mm thick tubes
[20:46] <qyx_> reception is about 5-8dB worse compared to 1/4 wave groundplane
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[21:00] <chrisstubbs> anyone have hamblib working on dl-fldigi on windows 8?
[21:01] <chrisstubbs> *hamlib
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[21:33] Action: SpacenearUS is going for a nap.
[21:33] Action: SpacenearUS is back!
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[21:46] Action: SpacenearUS is going for a nap.
[21:46] Action: SpacenearUS is back!
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[22:02] <natrium43> what does SpacenearUS dream of when it goes for a nap?
[22:05] <jcoxon> natrium43, i thought you had ascended to a higher plane of exisitence
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[22:07] <natrium43> haha, just have been too busy with other things
[22:08] <natrium43> wish there was a central place to catch up, it looks like a lot of cool things occurred
[22:09] <lz1dev> natrium43: http://www.perpetualjon.com/files/matrix001.jpg
[22:09] <jcoxon> basically B-64 went round the world a few times
[22:10] <Geoff-G8DHE_> and is still going
[22:11] <Geoff-G8DHE_> should re-apper tomorrow AM over the Azores
[22:12] <arko> B-64 was not only the first to loop the world but the last one remaining
[22:13] <arko> Leo did something really right with it and a hint of luck added to the mix
[22:13] <natrium43> jcoxon: that's amazing, anywhere i can read about the payload?
[22:13] <Geoff-G8DHE_> http://leobodnar.com/balloons/
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[22:20] <Laurenceb_> B-64 passing close to a hurricane
[22:20] <ulfr> :O
[22:21] <ulfr> It needs a vind speed meter.
[22:21] <ulfr> wind*
[22:21] <Laurenceb_> 0mph
[22:21] <Laurenceb_> simple
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[22:22] <ulfr> Oh please, we live in metric world mkay?
[22:22] <ulfr> (yet we talk about feet in altitude, what is wrong with us?)
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[22:39] <Geoff-G8DHE_> B-64 meanderings todate resistor colour code for loops! http://360.g8dhe.net/HAB_Flights/2014_Flights/B-64_20140712/B64_20141016120938.jpg
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[23:13] <arko> haha
[23:13] <arko> nice
[23:28] <zyp> did you start counting from 1?
[23:29] <zyp> that confused me for a moment, I couldn't find the starting point on the black circle :p
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[00:00] --- Sat Oct 18 2014