highaltitude.log.20170209

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[00:03] <Vostok> Luppe_: nice RS80 teardown in the newest EEVBlog mailbag :)
[00:03] <Vostok> https://www.youtube.com/watch?v=2QtLAsV5ocg
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[04:00] <SpacenearUS> New vehicle on the map: 03TI2LX-1 - 12https://tracker.habhub.org/#!qm=All&q=TI2LX-1
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[04:21] <freq_> im planning a launch for friday. should i use the ukhas launches mailing list to announce?
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[04:46] <SpacenearUS> New position from 03HIRFW-6 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
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[06:21] <SpacenearUS> New vehicle on the map: 03OM5KV_chase - 12https://tracker.habhub.org/#!qm=All&q=OM5KV_chase
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[07:50] <SA6BSS-Mike> cool https://hackaday.com/2017/01/24/a-simple-yagi-antenna-for-your-wi-fi-router/
[07:50] <SA6BSS-Mike> http://ham-radio.com/k6sti/wifiyagi.htm
[07:51] <SA6BSS-Mike> wonder if isobot can handel 2¼?
[07:51] <SA6BSS-Mike> 2¼"
[07:51] <SA6BSS-Mike> nop
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[10:05] <kokey> SA6BSS-Mike: nice, I have an office in a town centre it might help me stay in range of my wifi router when I'm at the coffee shop
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[10:35] <hairgoneJohn> hi. Any pico habbers here please?
[10:35] <Vaizki> yes, there's a bunch, why?
[10:35] <craag> a few floating around
[10:35] <AndyEsser> get out craag
[10:35] <AndyEsser> ....
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[10:36] <craag> :D
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[10:38] <hairgoneJohn> Hi . I'm a newbie and would be grateful for some advice
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[10:39] <Vaizki> don't eat yellow snow
[10:40] <hairgoneJohn> ho ho ho !
[10:40] <Vaizki> hi I'm from Finland, can you tell.. :D
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[10:41] <hairgoneJohn> i wish to test out the tracking and would like the balloon to float as long as possible. It is a 36 in foil qualtex. How much lift is best please?
[10:41] <Bobsaget> i put about 15 grams in my last qualatex 36 incher, it cruised at 38K feet with a 6 gram tracker
[10:42] <Bobsaget> 15 grams of lift
[10:42] <Bobsaget> but.. the pressure .... might be a bit high for it
[10:43] <hairgoneJohn> hi. 6 gram tracker? Surely the battery weighs more than that?
[10:43] <Bobsaget> no battery, cap only
[10:43] <Bobsaget> and i break my solar panel in half
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[10:44] <hairgoneJohn> are you using an arduino board?
[10:46] <Bobsaget> custom hold on i'll take a pic
[10:47] <Bobsaget> its 4.4 grams flying weight
[10:47] <hairgoneJohn> thanks. Does 15g with 6g payload mean 9gm net lift?
[10:47] <Bobsaget> no net lift 15 grams...really that is a lot more than i normally do
[10:47] <Bobsaget> but i normally cruise at 32K feet and get shot down by the weather
[10:48] <Bobsaget> really 36inch qualatex are doomed at my latitude (hong kong)
[10:48] <hairgoneJohn> thanks. And can we launch anytime or is ice on the envelope a problem?
[10:49] Action: AndyEsser misses Hong Kong
[10:49] <Bobsaget> misses Hong Kong? I hate this place
[10:49] <Bobsaget> someday i'll get out of here
[10:49] <AndyEsser> o really?
[10:49] <AndyEsser> how come?
[10:50] <Bobsaget> food, water, air, people
[10:50] <Bobsaget> basics
[10:50] <Bobsaget> all very very bad
[10:50] <Upu> I flew a 11g tracker under a 36" I never bothered much with weighing lift just put enough gas in so it looked like it was going up and stopped there
[10:50] <Upu> but 2-3g free lift I think
[10:51] <Upu> +/-5g
[10:51] <daveake> not -
[10:51] <hairgoneJohn> I am planning to use lora. Do many track lora ?
[10:51] <AndyEsser> :)
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[10:53] <Bobsaget> https://postimg.org/image/ot8v25n13/
[10:53] <Bobsaget> my 3 gram tracker :)
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[10:54] <Bobsaget> i think these 36 inch qualatex have too many limitations. where i am, its not uncommon for storms to top 40K feet
[10:54] <AndyEsser> pretty
[10:55] <AndyEsser> how long does the cap last if it's just being drained?
[10:55] <Bobsaget> as long as it has sun, its fine. of course at night its dead
[10:56] <AndyEsser> is the cap basically just there to smooth the output from the solar panel then?
[10:56] <Bobsaget> nah it will last about 30-45mins without sun
[10:56] <AndyEsser> ah ok
[10:56] <AndyEsser> cheers - that was the number I was curious about :)
[10:56] <Bobsaget> no GPS so tracking is just seeing what station i'm hitting lol
[10:57] <AndyEsser> what's the GPS update and radio TX cycle?
[10:57] <AndyEsser> ah ok, no gps
[10:57] <AndyEsser> was going to say that's impressive if you had a power hungry GPS :P
[10:57] <Bobsaget> i've been wanting to see what those ublox evas eat
[11:04] <Bobsaget> i bet i have released over 10 balloons with 2-3 grams of lift. not a single one made it over the pond
[11:04] <hairgoneJohn> guys. Is moisture on the balloon a problem in winter/
[11:05] <Bobsaget> u mean during the climb?
[11:05] <hairgoneJohn> yes.
[11:05] <Bobsaget> yeah at 2-3 grams of lift, just takes a little ice to bring you down
[11:05] <Bobsaget> but....with 15 grams of lift, pressure is very high at cruise
[11:05] <hairgoneJohn> is it ok to launch through coud?
[11:05] <Bobsaget> i think 36inch balloons are just not big enough
[11:06] <Upu> No I wouldn't go through cloud
[11:06] <Bobsaget> be better not too, but depends on the cloud. I'm normally a pilot, and clouds come in all forms
[11:06] <Bobsaget> high cirrus, probably OK, low level CBs...lol obviously not
[11:07] <hairgoneJohn> ok. Do many track lora?
[11:08] <Bobsaget> sorry i dont know lora
[11:08] <craag> hairgoneJohn: Not many picos, as there aren't many lora receivers outside western europe
[11:08] <craag> aprs is the best to use (where legal)
[11:09] <craag> rtty is good when you have receivers actively listening for it
[11:11] <hairgoneJohn> i'm in uk so not allowed aprs
[11:12] <craag> For getting started, rtty would be the best
[11:13] <craag> you'll be able to raise receivers across europe to help track it
[11:13] <craag> if it gets further... then you can start looking at more complex radio solutions (eg. geofenced aprs) for version 2 :)
[11:16] <Bobsaget> the ultimate tracking solution involves an stx3 :)
[11:17] <AndyEsser> Bobsaget: what do you fly normally
[11:19] <Bobsaget> a330
[11:21] <AndyEsser> bit bigger than me :P
[11:21] <SpacenearUS> New position from 03M10WX-11 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=M10WX-11
[11:22] <cm13g09> craag: The puns in this channel seem to balloon out of control when I'm not around.....
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[11:38] <SpacenearUS> New position from 03K6RPT-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K6RPT-11
[11:39] <hairgoneJohn> hi. i just weighed my payload at 35gm. Will a 36 in qualatex lift that pls?
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[11:42] <craag> it'll lift it, but not very high, maybe ~5km max
[11:42] <SpacenearUS> New position from 03RSIST after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
[11:42] <craag> probably closer to 4
[11:46] <buzz53> John and I are using Stuart Robinson's picotracker, is it not suitable for this size of balloon then?
[11:46] <craag> Can you link it for me?
[11:48] <buzz53> Link here: http://www.loratracker.uk/?p=30
[11:49] <craag> So yes that'll fly, and float, just not as high as the record-setters as it's a lot heavier
[11:50] <craag> not being as high means it'll encounter a lot more weather, which is why most people aim for <15g trackers to get the extra altitude
[11:50] <SpacenearUS> New vehicle on the map: 03apu_chase - 12https://tracker.habhub.org/#!qm=All&q=apu_chase
[11:50] <craag> I assume you're wanting to float this?
[11:50] <craag> Not just up-burst-down-recover?
[11:50] <buzz53> Interesting thanks, if a little disappointing!
[11:51] <buzz53> Can you give some figures for how an up/down profile would work?
[11:52] <craag> so for up/down, you want to put 15g+ of free lift in it, it'd likely then ascend to 3.5-4km, burst, then come back down.
[11:53] <craag> the less free lift you put it, the greater chance that it won't burst, and will stay floating at maximum altitude
[11:54] <craag> which is the other goal that people aim for with picos (and have achieved 3 months+ of float time, multiple circumnavigations, etc)
[11:54] <craag> so it's really a question of what you want to do :)
[11:54] <buzz53> Sorry, bit confused now, I thought the previous 4km was to float
[11:55] <buzz53> what height could we float at, if even possible?
[11:55] <craag> off the top of my head, with that weight, you might float it at 4-5km (with minimal free lift)
[11:56] <craag> the extra helium to make it burst means it wouldn't go as high, so maybe 3.5-4 if you wanted it to burst
[11:56] <craag> I mean we used to float things at 3.5km all the time
[11:56] <craag> there's nothing wrong with it
[11:57] <craag> so go for it if that's what you want to do!
[11:57] <buzz53> Well it's just a first toe in the water, much to learn!
[11:57] <craag> indeed :)
[11:58] <craag> I started with my first pico up-burst-down to 3.5km
[11:58] <craag> Had a misfill once that meant I floated at 2.5km - that was a bit terrible.
[11:59] <craag> tldr; 48h hackathons don't help mental arithmetic
[12:00] <Geoff-G8DHE> This table and grapth might help https://ukhas.org.uk/projects:microballoons:data?s[]=pico&s[]=float
[12:03] <hairgoneJohn> what is best battery to use? 1.5 or 3v?
[12:04] <cm13g09> 981
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[12:06] <craag> hairgoneJohn: I don't know what your device uses, but historically the non-rechargeable pico battery of choice has been an ENergizer Ultimate Lithium AAA (1.5v)
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[12:14] <hairgoneJohn> do you use one with step up or two batteries?
[12:18] <buzz53> Very interesting charts. The max free lift is for night, any guidance for daytime at 35g?
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[12:23] <Vaizki> hairgoneJohn, I think single AA and step up has been most common in what I have seen here.. if you use avr (arduino), clock it down to 4MHz so you can run it from 1.8V
[12:23] <mfa298> hairgoneJohn: you could use either, more batteries will probably mean longer run time (good for floats)
[12:26] PE2BZ (~pe2bz@005-038-128-083.dynamic.caiway.nl) joined #highaltitude.
[12:26] <PE2BZ> !flights
[12:26] <SpacenearUS> 03PE2BZ: Current flights: 03UBSEDS18 434.612.5 CONTESTIA 16/1000 10(64a5), 03UBSEDS21 434.610 CONTESTIA 16/1000 10(2e88)
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[12:31] <hairgoneJohn> thanks for the advice guys
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[12:41] <SpacenearUS> New vehicle on the map: 03RSIZM - 12https://tracker.habhub.org/#!qm=All&q=RSIZM
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[13:11] <buzz53> \quit
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[13:51] Nick change: Dan_ -> Guest14191
[13:53] <Guest14191> Hello! Came here from UKHAS website, hoping I'm in the right place?
[13:54] <adamgreig> yep
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[14:33] Nick change: kc2uez-7 -> kc2uez
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[14:36] <freq_> Requesting approval for flight document Gaia3
[14:36] <Geoff-G8DHE> flight docs best approved in #habhub
[14:36] <Geoff-G8DHE> post the long id no for the doc
[14:49] <SpacenearUS> New position from 03SV3CIX-11 after 0321 hours silence - 12https://tracker.habhub.org/#!qm=All&q=SV3CIX-11
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[16:34] Nick change: Malvolio -> Guest32197
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[17:16] <SpacenearUS> New vehicle on the map: 03BUZZ - 12https://tracker.habhub.org/#!qm=All&q=BUZZ
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[18:04] <SpacenearUS> New vehicle on the map: 03MICROBIT - 12https://tracker.habhub.org/#!qm=All&q=MICROBIT
[18:04] <daveake> woo
[18:04] <daveake> pita too
[18:09] Action: PE2BZ thinks daveake has had bad food and now had p i t a ?
[18:10] <daveake> Nah ... trying to squeeze a LoRa tracker into a BBC Microbit with Micropython
[18:10] <daveake> Memory is an issue
[18:10] <PE2BZ> In a microbit ? That educational :-)
[18:12] <daveake> hah :)
[18:13] <daveake> I'll hopefully get it to stay working. It's close ... maybe a shorter payload ID :p
[18:13] <PE2BZ> My youngest one wants to start programming. He wanted a Pi, but I think I let him start online with the emulator.
[18:18] <nick_> PE2BZ: I just started my wife on the codecademy python course.
[18:19] <nick_> Seems neat so far (one lesson in)
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[18:20] <daveake> I've removed some debug code and now it has enough ram to stay working (so far ...)
[18:21] <daveake> free memory is cycling up and down repeatably, so looks good so far ...
[18:21] <daveake> I'll probably code this in C though ... it's a bit delicate
[18:22] <PE2BZ> nick_ neat ! But what would your wife do with Python ? Mine speaks Wordpress only ;-)
[18:22] <dbrooke> if you get rid of the code to monitor free memory you'll probably have plenty of free memory 8-)
[18:22] <nick_> She's a chemist and wants to transition from using Excel for data analysis.
[18:22] <nick_> So she's learning Python and scipy (numpy/matplotlib) for plotting stuff and whatnot.
[18:23] <PE2BZ> That´s a nice idea! The only thing I know about those are that I had to install them for making my spectrum heatmap work ;-)
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[22:44] <SpacenearUS> New vehicle on the map: 03UBSEDS22 - 12https://tracker.habhub.org/#!qm=All&q=UBSEDS22
[22:49] <SpacenearUS> New vehicle on the map: 03UBSEDS22G - 12https://tracker.habhub.org/#!qm=All&q=UBSEDS22G
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[00:00] --- Fri Feb 10 2017