highaltitude.log.20170616

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[01:40] <SpacenearUS> New vehicle on the map: 03DL7AD-12 - 12https://tracker.habhub.org/#!qm=All&q=DL7AD-12
[02:50] <SpacenearUS> New position from 03SP9UOB after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB
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[04:15] <SpacenearUS> New position from 03BSS7 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS7
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[07:20] <LZ1CLA> Hey guys SP9UOB-P30 is in my range, but fldigy says contestia and then sets the mode to domex22
[07:20] <LZ1CLA> what is the right protocol ?
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[07:23] <Mike-SA6BSS> LZ1CLA: Contestia 32/1000
[07:24] <Mike-SA6BSS> http://sp7pki.iq24.pl/default.asp?grupa=230409&temat=455531
[07:25] <LZ1CLA> ok, 10x
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[10:25] <SpacenearUS> New position from 03BARC5 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BARC5
[10:35] <SpacenearUS> New vehicle on the map: 03VK5QI-9_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5QI-9_chase
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[11:06] <pb0ahx> !flights
[11:06] <SpacenearUS> 03pb0ahx: Current flights: 03ryde 10(9429), 03Bader 10(1950), 03Dixon220 10(4d60), 03SP9UOB-P30 144.251 MHz CTSTIA 10(cbd2)
[11:06] <pb0ahx> !dial 4d60
[11:07] <SpacenearUS> 03pb0ahx: Latest dials for 03BARC5 10(4d60): 03433 MHz, 434.55 MHz, 434.550656 MHz, 434.55013 MHz, 434.55042 MHz, 434.550578 MHz
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[11:21] <SpacenearUS> New position from 03YPADSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[11:26] <SpacenearUS> New vehicle on the map: 03SP7PPT-12 - 12https://tracker.habhub.org/#!qm=All&q=SP7PPT-12
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[11:49] <SpacenearUS> New position from 03RSIST after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
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[12:30] <SpacenearUS> New vehicle on the map: 03RPF_Chase_chase - 12https://tracker.habhub.org/#!qm=All&q=RPF_Chase_chase
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[12:40] <ryancomet> hi, we're a school taking part in the high altitude balloon project and were wondering if covering the payload in tin foil will affect the signal produced by the antenna
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[12:40] <ryancomet> we are using a ground plane antenna mounted on the bottom of the payload
[12:41] <adamgreig> so long as the antenna is below the payload, then it doesn't matter much what goes on in the payload
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[12:42] <daveake> Also make sure the GPS antenna is outside the box, on the top, for the same reason
[12:43] <ryancomet> we were looking at wrapping the box in it externaly, rather than attaching it to the interior of the payload , would this still have no effect
[12:43] <daveake> Same rules apply; antennae need to be outside
[12:44] <ryancomet> ok, but can we place the tinfoil on the outside too?
[12:45] <daveake> Yes, so long as the aerials are outside of that.
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[12:56] <SpacenearUS> New vehicle on the map: 03MARIJA_chase - 12https://tracker.habhub.org/#!qm=All&q=MARIJA_chase
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[13:01] <Laurenceb__> !whereis HIRFW-3
[13:01] <SpacenearUS> 03Laurenceb__: 03HIRFW-3 was over 03Ouesso, Republic of the Congo 10(1.85607,15.79548) at 033221 meters about 0321 days ago
[13:01] <Laurenceb__> !whereis HIRFW-6
[13:01] <SpacenearUS> 03Laurenceb__: 03HIRFW-6 was over 03Federated States of Micronesia 10(9.77274,141.54548) at 0314221 meters about 035 hours ago
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[13:22] <Ian_> A good idea might be to test before cladding with foil and again afterwards, to ensure that the tracker is working as it should and if it suddenly doesn't, then you have an idea of where to start looking. Just in case :)
[13:22] <Ian_> HAB or UFO?
[13:22] <Ian_> Shiney!
[13:23] <daveake> I did a foild-clad UFO ages ago
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[13:23] <daveake> Before the aerial went on - http://www.daveakerman.com/wp-content/uploads/2011/09/P1030170-1024x768.jpg
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[13:28] <fsphil> nice
[13:29] <fsphil> ryancomet: one problem with the foil covered payloads, they can be very hard to spot in trees
[13:31] <daveake> The comet aircraft was nice and shiny. Wonder what happened to that ...
[13:32] <Ian_> Nimrod!
[13:32] <daveake> https://images.vice.com/motherboard/content-images/article/36092/1469685079229145.jpg
[13:33] <Ian_> Didn't they make a Staybright version of that? Thank goodness for modern paint jobs. Saves a lot of polishing!
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[14:24] <kokey> what design/simulation software is there that can simulate an arduino?
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[14:44] <SpacenearUS> New position from 03KF5KMP-8 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=KF5KMP-8
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[18:35] <SpacenearUS> New vehicle on the map: 03CZ_HAB_OL - 12https://tracker.habhub.org/#!qm=All&q=CZ_HAB_OL
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[19:42] <SpacenearUS> New position from 03LA2K17 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=LA2K17
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[19:57] <Hopper_> Hey HABers, does anyone have an example of how to detect freefall vs. turbulence for parachute deployment?
[19:59] <stilldavid> easy using GPS :)
[19:59] <stilldavid> if you mean accelerometer I'm afraid I don't know.
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[20:08] <Hopper_> stilldavid: I've got both, GPS is fine, I honestly just don't know if high altitude wind would cause a drop in altitude of 500m, which would cause the chute to deploy.
[20:09] <stilldavid> I'd have to pull up my flight data, but I don't think I've seen anything like that above ~50k feet - there's just not enough air to push it around that much.
[20:10] <stilldavid> my bursts are all quite mellow, a far cry from what it's like in the jet stream
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[20:13] <Hopper_> What do you mean?
[20:13] <stilldavid> if you have the system trigger above 50k feet, then any drop of 500m or more is almost certainly a burst
[20:15] <daveake> What's wrong with using an inline chute so it deploys without any processor involvement ?
[20:15] <Hopper_> This is for the balloon cutaway.
[20:16] <Hopper_> Is 500m the set limit you would use? What happens if there was a burst below 50k, no cutaway?
[20:16] <daveake> OK, so not a chute deployment then, which is what you said.
[20:16] <Hopper_> Yes, because it needs to be thought of that way for my HAB design, the cute will not function fully until the balloon is cut away.
[20:18] <stilldavid> I just run the chute inline under the balloon, I've never messed with a cutaway - especially one with a bad failure mode if it doesn't get cut
[20:18] <daveake> Yup
[20:18] <daveake> I don't recall seeing a balloon that's doing a normal 3m/s+ ascent rate to descend at all, at least not from one telemetry string to another
[20:18] <Hopper_> I agree, that is the best option, but for this contract it is not an option.
[20:18] <daveake> Doesn't mean it won't see a GPS altitude less than the previous one
[20:19] <daveake> Something like 10 consecutive reducing altitudes should do it
[20:20] <Hopper_> at what rate of reading?
[20:20] <Hopper_> Just hedging the bet that you wont have your update rate the same as the turbulence pattern.
[20:20] <Hopper_> ^?
[20:20] <daveake> 1Hz
[20:21] <stilldavid> I'm with dave on this, I don't think I've had a payload drop like that, even when traveling quite fast
[20:21] <Hopper_> 10 seconds of drop definately seems safe, just hoping that's not enough time for tumbling to start.
[20:21] <daveake> Different ofc for a floater ... those can drop for a long time, albeit slowly
[20:21] <Hopper_> Thank you both for reassuring me that you've never seen bucking like that.
[20:22] <Hopper_> Mine is a fast acent and decent, no concern for dawdling.
[20:22] <Hopper_> ascent*
[20:22] <daveake> A combination of several readings going down, and a minimum total descent across those readings, would do it
[20:23] <daveake> Over here, a flight where the chute is deployed would need special approval with the CAA including test results AIUI
[20:24] <stilldavid> we play fast and loose across the pond :P
[20:25] <Hopper_> David's got that right.
[20:26] <Hopper_> Sorry I can't show you my HAB yet, NDA. But I'll definately show everyone documentation on completion.
[20:27] <stilldavid> can you say if it's a science or marketing payload?
[20:27] Action: stilldavid likes to pry
[20:27] <stilldavid> :P
[20:28] Action: Hopper_ shouldn't take any risks with answering that question.
[20:29] <stilldavid> fair enough. hope you can share eventually!
[20:29] <daveake> I have burst detection as one of my cutdown triggers for my project, along with time-since-launch, long/lat limits, and (important one for this) "can I glide to the target from here/"
[20:31] <daveake> But the parachute is deployed as it drops - I'm just cutting away from the balloon
[20:34] <Hopper_> That makes sense, how do you have burst detection implemented?
[20:34] <daveake> The way I suggested
[20:36] <daveake> I do have an accelerometer too (well a 9DOF sensor really) for other purposes, but not using that for burst detection
[20:36] <Hopper_> I'm avoiding using my accel for much of anything.
[20:36] <Hopper_> Gyro and mag are essential.
[20:43] <Hopper_> daveake: What do you use the 9DoF for?
[20:43] <daveake> Sorry can't say NDA :p
[20:44] <daveake> Working on a homing chute
[20:44] <Hopper_> Don't tease me for turning a profit! How will the chute home?
[20:45] <daveake> Well that bit I am keeping to myself for now ... we have a little competition (prize = bottle of bubbly from Ed) here for the first person to fly a UK HAB to a pre-announced landing spot
[20:46] <daveake> Don't want to help someone get to the bubbly before me :)
[20:47] <Hopper_> Well let me know when your NDA is finished!
[20:49] <daveake> There's no NDA :-). But yeah I'll blog it. Actually have already written it up but not publishing it at lest till I've had a shot.
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[20:51] <Hopper_> It is an NDA, you've just agreed with yourself.
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[21:14] <SpacenearUS> New position from 03SP7PPT-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP7PPT-11
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[21:52] <SpacenearUS> New position from 03HIRFW-6 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
[21:55] <Hopper_> daveake: What line do you use on your HAB for your balloon/chute?
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[22:20] <SpacenearUS> New position from 03SQ5AM-11 after 035 days silence - 12https://tracker.habhub.org/#!qm=All&q=SQ5AM-11
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[23:10] <Laurenceb__> !whereis HIRFW-6
[23:10] <SpacenearUS> 03Laurenceb__: 03HIRFW-6 was over 03Federated States of Micronesia 10(7.60607,139.79548) at 0314221 meters about 0314 minutes ago
[23:12] <Laurenceb__> http://online.liebertpub.com/doi/full/10.1089/space.2017.29009.emu
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[23:12] <Laurenceb__> I don't think this counts as peer reviewed
[23:14] <Laurenceb__> or maybe it is...
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[23:22] <SpacenearUS> New position from 03YPADSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
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[23:27] <SpacenearUS> New vehicle on the map: 03SB2A - 12https://tracker.habhub.org/#!qm=All&q=SB2A
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[23:40] <SpacenearUS> New position from 03RSIST after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=RSIST
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[00:00] --- Sat Jun 17 2017