highaltitude.log.20160620

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[00:51] <Laurenceb__> http://www.generalfusion.com/blog/wp-content/uploads/2014/07/General-Fusion-CNS-2013.pdf
[00:51] <Laurenceb__> predictably it turns out to be harder than they thought
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[00:57] <SpeedEvil> :/
[00:58] <SpeedEvil> 'It is with regret we announce that our fusion approach was flawed and we dramatically underestimated the yield. The eighteen megaton explosion in chicago killed three million confirmed so far. The full death toll may never be known.
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[07:39] <AndyEsser> morning
[07:40] <fsphil> o/
[07:42] <x-f> \o
[07:45] <AndyEsser> everyone had a good weekend?
[07:48] <SM0ULC-Reb> rain^2, but i guess for you britons that's default
[07:51] <AndyEsser> ha
[07:51] <AndyEsser> it was sweltering heat and sunshine the other week
[07:51] <AndyEsser> now just constant rain
[07:51] <AndyEsser> seems kind of pointless having the A/C installed today
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[08:05] <edmoore> just rain and lots of it here
[08:11] <russss> well, it is Wimbledon and Glastonbury this week
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[08:28] <cm13g09> russss, edmoore: Wimbledon is implied rain....
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[09:08] <SpacenearUS> New vehicle on the map: 03LORA1 - 12http://tracker.habhub.org/#!qm=All&q=LORA1
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[09:18] <SpacenearUS> New vehicle on the map: 03NAILBRUSH - 12http://tracker.habhub.org/#!qm=All&q=NAILBRUSH
[09:18] <AndyEsser> o.0
[09:33] <WillDWork> guys, is this soldering rework station worth considering? Looking at putting my old iron out to graze:
[09:33] <WillDWork> https://www.amazon.co.uk/gp/product/B015RQHRT8
[09:33] <russss> they are OK, not amazing
[09:35] <WillDWork> OK, cheers
[09:35] <Geoff-G8DHE-M> Can you get replacement bits easily ?
[09:35] <russss> the replacement parts are fairly standard I think. The brand is actually different to the ones I've seen but it looks very similar
[09:48] <SpacenearUS> New vehicle on the map: 03chavani gp_chase - 12http://tracker.habhub.org/#!qm=All&q=chavani%20gp_chase
[10:11] <SpacenearUS> New vehicle on the map: 032149161206_chase - 12http://tracker.habhub.org/#!qm=All&q=2149161206_chase
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[10:38] <edmoore> for the money i might be inclined to just get a decent hakko iron
[10:38] <edmoore> and spend £25 on a hot air pencil separately if you want one
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[10:39] <russss> yeah
[10:39] <russss> or I will plug the TS100 again. http://www.banggood.com/TS100-Digital-OLED-Programable-Interface-DC-5525-Soldering-Iron-Station-Built-in-STM32-Chip-p-984214.html
[10:39] <Vaizki> mm.. return of the leading pocket times intelligent everywhere
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[12:17] <daveake> Apparently you adjust the temperature with your finger
[12:17] <daveake> Sounds painful
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[12:32] <Vaizki> why is it 17W @ 12V and 65W @ 24V.. doesn't make sense to me :O
[12:34] <Vaizki> 1.4A at 12V and 2.7A at 24V.. does the heating element behave like that, resistance goes down with voltage or something?
[12:34] <Vaizki> goes down with increased voltage that is
[12:35] <SpeedEvil> Err - no
[12:35] <SpeedEvil> 17W@12V - double that to get to 34W, and double again to get to 68W
[12:35] <SpeedEvil> Which is very close to 65W
[12:37] <gonzo__> P= V^2 / R
[12:38] <Vaizki> ha.
[12:38] <Vaizki> all I needed was more gonzo
[12:39] <gonzo__> I'd expwect most heating elements to be PTC, so the R would increase a little, possibly explaining the 65 ve 68 W
[12:39] <gonzo__> vs
[12:39] <gonzo__> is hat a soldering iron station?
[12:40] <SpeedEvil> gonzo__: Or just rounding errors
[12:40] <SpeedEvil> gonzo__: From memory it's a little pencil soldering iron with an OLED and STM32 in
[12:40] <SpeedEvil> gonzo__: like the USB soldering iron you may or may not be familar with
[12:41] <gonzo__> usb soldering iron..... !!!!!!!
[12:41] <Vaizki> I must admit I have a TS100 and I never used it...
[12:41] <Vaizki> it's in my boat
[12:41] <gonzo__> but generaly, if it's temp controled, then it's only the max wattage you need to worry about
[12:41] <SpeedEvil> www.ebay.co.uk/itm/Mini-Portable-USB-5V-8W-Electric-Powered-Soldering-Iron-Pen-Tip-Touch-Switch-OV-/161897715250
[12:41] <russss> I use mine a fair amount and I'm pretty happy with it.
[12:41] <Vaizki> russss: you feed it with a lab power?
[12:41] <SpeedEvil> https://www.youtube.com/watch?v=o-8D5t6TJYU - review
[12:41] <gonzo__> it's how fast it can get the heat into the iron when you apply it to a sink
[12:41] <russss> I have a fairly beefy 19V wall wart PSU which I use with it
[12:42] <SpeedEvil> (he's happy about it)
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[12:42] <gonzo__> the 50watt weller has served me well for decades
[12:42] <fsphil> I do need to get myself one of those laptop battery banks with the 18V+ output
[12:42] <russss> I also have a battery pack which will do 19V out, which it runs off pretty successfully
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[12:44] <Vaizki> mmm what are these 18V battery banks you speak of
[12:44] <edmoore> lots of power tools use 18V
[12:45] <edmoore> five nominally-voltages Li-On cells in series
[12:45] <gonzo__> I had some old GPO irons once, that ran off the 48V exchange supply. Via a bantam jack plug
[12:45] <edmoore> voltaged*
[12:45] <Vaizki> my snow blower is 36V.. :)
[12:45] <edmoore> i don't have one
[12:46] <russss> the battery pack I have is no longer being sold
[12:46] <SpeedEvil> The above USB soldering iron is great for taking with you when you don't expect to need a soldering iron
[12:47] <Vaizki> I used to have one of those lighter gas jobbies as a kid..
[12:47] <SpeedEvil> I got http://www.hobbyking.com/hobbyking/store/__80904__Multistar_High_Capacity_4S_20000mAh_Multi_Rotor_Lipo_Pack_UK_Warehouse_.html - on sale at half price
[12:47] <SpeedEvil> For a garden barrow project
[12:48] <fsphil> I've been looking out for an 18V one in the shops but haven't seen one yet. don't really trust buying direct from .cn
[12:50] <Vaizki> SpeedEvil: what are you using as a motor for the barrow?
[12:50] <daveake> It would help if they didn't keep using names like UltraFire and ExplodyBatts
[12:50] <Vaizki> SureFire
[12:51] <Vaizki> I have some turnigy and zippy lipos, they seem to be pretty well behaved
[12:51] <SpeedEvil> http://www.hobbyking.com/hobbyking/store/__67038__Quanum_MT_Series_5008_335KV_Brushless_Multirotor_Motor_Built_by_DYS.html - or similar
[12:51] <SpeedEvil> with a chain drive final reducer, and probably a simple gear initial
[12:54] <Vaizki> ah ok I thought something simpler, scary chinese kit :)
[12:55] <Vaizki> my mom has a hydraulic "barrow" on rubber tracks.. that thing is awesome
[12:55] <SpeedEvil> Well, the problem is the existing hardware available if you want the top-speed to be 5MPH is small.
[12:55] <SpeedEvil> Or rather - expensive
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[14:10] <SpacenearUS> New vehicle on the map: 03CHAS - 12http://tracker.habhub.org/#!qm=All&q=CHAS
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[14:31] <Laurenceb> epic rap battles https://www.youtube.com/watch?feature=player_detailpage&v=AM_Ssz3b2mE#t=278
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[15:01] <SpacenearUS> New vehicle on the map: 03SQ5MBG_chase - 12http://tracker.habhub.org/#!qm=All&q=SQ5MBG_chase
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[15:11] <adamgreig> fun SDR almost at its crowdsourcing target if anyone's interested https://www.crowdsupply.com/lime-micro/limesdr
[15:11] <adamgreig> higher specs than the bladeRF for half the price
[15:12] <adamgreig> including 2x2 MIMO for space division HAB multiple access :P
[15:12] <edmoore> i haves an eye on it
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[15:13] <adamgreig> i have backed it because i'm weak when it comes to such things
[15:13] <adamgreig> but 32 hours left on the campaign and another 50k left to raise has gotta be frustrating for them
[15:13] <Laurenceb> I'm unconvinced by a lot of this SDR stuff
[15:13] <russss> it's a shade out of my impulse buy bracket
[15:14] <Laurenceb> direct conversion with a messy LO ends badly
[15:14] <Laurenceb> I see no evidence of that being well understood, apart from by the DVBT dongle makers
[15:14] <Laurenceb> kind of predictable as they are trained professionals...
[15:15] <adamgreig> this SDR's done by lime microsystems who've been doing RF ASICs for years...
[15:15] <adamgreig> so I suspect they have some idea what they're doing
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[15:15] <adamgreig> (the RF IC on this SDR is their own, and is the newer generation of the one the bladeRF uses)
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[15:15] <Laurenceb> oh its actually by Lime themselves
[15:15] <Laurenceb> I see
[15:15] <adamgreig> yea
[15:16] <Laurenceb> but they may still be playing the "scam the n00bs" tune
[15:17] <adamgreig> shrug
[15:17] <adamgreig> for $250 you get very very similar specs to the ettus B210
[15:18] <adamgreig> which is $1100 sort of thing
[15:18] <adamgreig> and my general feeling is that ettus also have some idea what they're up to
[15:19] <Laurenceb> yes Ettus def do
[15:19] <mattbrejza> not sure why it has a usb A connector on it
[15:19] <adamgreig> mattbrejza: you can buy it with micro B too
[15:19] <adamgreig> I'm not sure why you'd go for an A either
[15:19] <mattbrejza> and annoying little rf connectors rather than SMA
[15:19] <adamgreig> uFl are pretty common
[15:19] <mattbrejza> still annoying and small
[15:20] <russss> needs putting into a case
[15:20] <miek> i would make a case and mount bulkhead sma -> ufl
[15:20] <adamgreig> yea, it wants a nice case
[15:20] <adamgreig> they do have acrylic and aluminium cases for it
[15:21] <adamgreig> I wanna put it into a rocket body section with some conformal antennas on the outside and have a cute little bolt-in radio
[15:22] <adamgreig> sadly it's too wide to fit into the top part of the rocket I'm working on now :(
[15:23] <AndyEsser> make a bigger rocket?
[15:23] <AndyEsser> :)
[15:23] <adamgreig> that's the cop out
[15:23] <adamgreig> but we lose a couple km altitude for each 5mm increase in top diameter
[15:23] <mattbrejza> ask them for a flex pcb version so you can roll it up and put it inside
[15:23] <adamgreig> not ok
[15:23] <adamgreig> mattbrejza: omg yea
[15:23] <russss> lol
[15:23] <AndyEsser> adamgreig: wow, that's pretty extreme
[15:24] <adamgreig> it's a medium-extreme rocket
[15:24] <adamgreig> but yea the top section is tricky
[15:24] <AndyEsser> any pics/blogs/etc about it I could read?
[15:25] <adamgreig> not really sure what of it's public yet
[15:25] <adamgreig> but check out the avionics stack https://agg.io/u/m3a.pdf
[15:25] <AndyEsser> Ah ok - no worries
[15:25] <AndyEsser> ta
[15:25] <russss> I am curious about whether it would be sensible to build a VNA out of the LimeSDR
[15:25] <Laurenceb> if you want altitude someone needs to do a rockoon lol
[15:25] <AndyEsser> Laurenceb: on the to-do list
[15:25] <AndyEsser> but at my rate of building/researching... it'll be 20 years
[15:25] <adamgreig> it seems like it should make sense
[15:25] Action: Laurenceb is too busy too :S
[15:25] <adamgreig> but when I tried it with my bladeRF it didn't match real VNAs very well at all
[15:26] <Laurenceb> do you _need_ an SDR on a rocket?
[15:26] <adamgreig> I don't _need_ a rocket
[15:26] <russss> lol
[15:26] <adamgreig> so it's a kind of meaningless question
[15:26] <Laurenceb> I guess you could do synthetic aperture radar scanning
[15:26] <Laurenceb> only application I can think of
[15:26] <adamgreig> SDR is easier than doing a specialist fixed-purpose radio for a lot of things, right
[15:26] <adamgreig> obviously the "best" solution is some kind of dedicated radio
[15:26] <adamgreig> for whatever insane frequency and modulation and bla bla bla
[15:26] <adamgreig> but SDRs are small and easy and cheap and good
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[15:44] <AndyEsser> adamgreig: 12 power supplies?
[15:44] <adamgreig> yea
[15:44] <adamgreig> well one power supply with 12 channels
[15:44] <AndyEsser> ah
[15:45] <adamgreig> each of which is independently voltage monitored, current controlled, etc
[15:45] <adamgreig> so that one thing going crazy can just be cut off and rebooted and it won't affect the rest
[15:45] <AndyEsser> nice
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[17:08] <Vaizki> adamgreig: it's a bit like camera zoom lenses vs. primes.. 100x more money is poured into developing zoom lenses so they become pretty good and leave some weaker primes wanting, even though by nature a prime lens will be better with the same amount of investment.. :)
[17:09] <adamgreig> you can have my primes when you pry them out of my cold dead hands
[17:10] <Vaizki> indeed. I'm sure many hams feel the same about their band-dedicated rigs :)
[17:10] <adamgreig> hah
[17:11] <Vaizki> don't get me wrong.. 14/2.8, 24/1.4, 35/1.4, 50/1.4, 85/1.8, 100/2.8, 135/2...
[17:12] <Vaizki> but zooms and sdrs sure are handy to have :)
[17:12] <adamgreig> my favourite lens of all is my 60mm macro i reckon
[17:12] <Vaizki> yes the 100/2.8L is a macro as well.. wonderful piece of kit (canon)
[17:12] <adamgreig> yes that's lovely
[17:13] <adamgreig> mine is the ef-s canon so no red ring for me but it's nice
[17:13] <Vaizki> still the 135/2 takes the cake in terms of ultimate keeper shots
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[17:14] <Vaizki> anyway, duty calls, the grill is hot and the black angus not...
[17:14] <chris___> Hi all!
[17:21] <chris___> Last night I was chatting about my poor luck in tracking SPUD on Sunday. My antenna or dlfl digi setting were not good. It was suggested I check the polarization on the antenna.
[17:22] <chris___> I looked here http://www.aerialsandtv.com/fmanddabradio.html#Polarisation
[17:22] <chris___> Is it the case that it is vertically polarized if the antenna is vertical. My antenna is vertical so does that make it vertically polarised? Is this good for HAB?
[17:23] <edmoore> yes
[17:23] Last message repeated 1 time(s).
[17:23] <edmoore> well its' indifferent for hab
[17:23] <edmoore> you just want transmitter and receiver to be matched
[17:23] <edmoore> regardless of the application
[17:24] <edmoore> in some applications where there's lots of bouncing off the ionosphere it doesn't matter as much, or at all, as the polarisations get scattered
[17:24] <edmoore> but usually if you have line-of-sight you want the same polarisation between tx and rx
[17:25] <edmoore> unless there's some overriding reason not to
[17:27] <chris___> i just receive... so as I understand it a vertical dipole is good. Great!
[17:28] <chris___> I am going to try and buy a pre amp to solve my problems
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[17:40] <edmoore> yep they help too
[17:40] <edmoore> they night to be right at the antenna
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[17:51] <chris___> I've email uputronics and got an automated responce to say that he is on paternity leave. If he is tuned in then I'd like to congratualte him on the new arrival
[17:52] <edmoore> he is :)
[17:52] <edmoore> he's probably asleep
[17:52] <edmoore> arrived last week
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[18:49] <daveake> I saw a pic earlier - he's got it wearing a balloon-themed outfit already :)
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[19:33] <SpacenearUS> New vehicle on the map: 03SKYBLUE1 - 12http://tracker.habhub.org/#!qm=All&q=SKYBLUE1
[19:36] <michal_f> hi all. I was thinking of adding some code to my tracker to predict burst point. This would be based on balloon data and current ascent rate...
[19:37] <michal_f> Can I assume this: https://github.com/cuspaceflight/cusf-burst-calc is the best place to look into ?
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[19:40] <Vaizki> michal_f: umm why?
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[19:42] <michal_f> why not :)
[19:42] <adamgreig> michal_f: sure, but please check out https://github.com/danielrichman/burst-calc-notes/blob/master/notes.pdf
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[19:42] <michal_f> real cause is:
[19:43] <michal_f> I can't keep camera turned on all the time due to battery and storage constrains
[19:43] <michal_f> I enable it on intervals and I wouldn't like to miss burst
[19:43] <adamgreig> burst is a bit hard to predict that accurately
[19:44] <adamgreig> depends how precise you're trying to be
[19:44] <adamgreig> but it's one of the biggest variables in predicting landing, after launch has happened
[19:45] <michal_f> If I miss it, nothing horrible happens. It's just a nice excercise trying to predict it
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[19:46] <SpeedEvil> Now would be a good time to launch a balloon to get pictures of the russian invasian force rolling onto the Swansea beaches in response to the oppression of a russian minority.
[19:46] <SpeedEvil> :)
[19:47] <SpeedEvil> (wales 2 russia 0)
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[19:57] <SpacenearUS> New vehicle on the map: 03MIKEL - 12http://tracker.habhub.org/#!qm=All&q=MIKEL
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[20:19] Nick change: KingJ_ -> KingJ
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[20:20] <JonnyAlpha> Hi, I have just submitted a flight document for CAEN_CP1, could someone approve. Not yet receieved CAA auth yet so I understand no fly until we get it.
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[20:22] <mfa298> JonnyAlpha: you should go into #habhub (/join #habhub) and post the fligtdoc id
[20:23] <JonnyAlpha> Ah were do I get the flight doc ID, back on Habitat?
[20:24] <mfa298> it should have been on the screen when you made the flight doc
[20:24] <mfa298> you could be able to find it on habitat
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[20:26] <JonnyAlpha> I just ent into create flight doc from existing and saved it again and got it thanks
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[21:27] <SpacenearUS> New position from 03CAEN_CP1 after 03a day silence - 12http://tracker.habhub.org/#!qm=All&q=CAEN_CP1
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[22:46] <SpacenearUS> New vehicle on the map: 03KE0GEO-12 - 12http://tracker.habhub.org/#!qm=All&q=KE0GEO-12
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[23:26] <tweetBot> @daveake: LoRa Tracking Guide added to the #UKHAS wiki https://t.co/Oa6D9heJBV
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[23:40] <SpacenearUS> New vehicle on the map: 03RTLS1 - 12http://tracker.habhub.org/#!qm=All&q=RTLS1
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[00:00] --- Tue Jun 21 2016