highaltitude.log.20161118

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[01:05] <SpacenearUS> New position from 03N4XWC-1 after 035 days silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[08:41] <SpacenearUS> New position from 03ER1TUM/AM after 0317 hours silence - 12https://tracker.habhub.org/#!qm=All&q=ER1TUM%2FAM
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[08:41] <Cubesat1> Hi everyone
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[08:49] <Cubesat1> i'm looking some advice, im a mechanical engineer with a background in coding, i am undertaking a cubesat project with a launch looking likely, however i need a transciever capable of downlinking data from Low Earth Orbit between 200km and 1000km that will work with arduino to transmit images and sensor data, any help greatly appreciated thankyou
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[08:54] <Darkside> hrm, there's been a few people here involved in cubesats
[08:54] <Darkside> i think many just use a COTS system
[08:54] <SpacenearUS> New position from 03K6RPT-11 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=K6RPT-11
[08:54] <Darkside> and a COTS platform/control board
[08:55] <Darkside> i think a few have tried custom downlink stuff, but it would certainly require infrastrucutre on the ground
[08:55] <Darkside> and of course frequency planning, authorization, all that jazz
[08:55] <Cubesat1> yea, im hoping to set up a downlink centre from home. Ok so this is the exact stuff i need! whats the frequency planning?
[08:57] <Darkside> as in,g etting authorization to use a given downlink frequency
[08:57] <Darkside> for researching cubesats, i believe they often get tied to an amateur radio licence
[08:58] <Darkside> as many cubesats use a portion of the 70cm amateur radio band for comms
[08:59] <Darkside> other higher rate systems will probably use S-band comms (~2.4GHz), but that requires good in-orbit stability to work
[08:59] <Darkside> whereas 70cm comms could probably work if the sat is spinning (not sure about that mind you)
[09:00] <Darkside> the cubesat project I was involved with had that side of things covered by another group, i was just working on an ionospheric sensing payload
[09:01] <Darkside> also don't forget that with a single ground station you're only going to get some few minutes of downlink/uplink time per day
[09:01] <SpacenearUS> New position from 03HIRFW-6 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-6
[09:01] <SpeedEvil> Darkside: and not every day
[09:02] <SpeedEvil> (unless on the equator with an equatorial orbit)
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[09:15] <SpacenearUS> New vehicle on the map: 03HIRF-3 - 12https://tracker.habhub.org/#!qm=All&q=HIRF-3
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[09:19] <gonzo_> he obviously wasn't that interested in advice
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[09:21] <gonzo_> 70cms is the band of choice for university cubesats, because they can get amateur satellite service allocations. And if they make the telem decodingSW open to all, they get a free worldwide rx network
[09:21] <gonzo_> commercial have to use the dedicated bands, like 2.2GHz
[09:22] <AndyEsser> what are the downsides of 70cms?
[09:22] <AndyEsser> vs 2.2gig
[09:23] <gonzo_> I would think that there are no downsides
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[09:24] <gonzo_> 2.2GHz I suspect only allows limited channel size, as it's for TT&C
[09:24] <gonzo_> pjm would know that better than me
[09:24] <AndyEsser> I need to see if Gywnedd will let me mount some antennas on the roof of the building...
[09:25] <AndyEsser> or.... top of Snowdon
[09:25] <AndyEsser> (which they've previously said would be fine)
[09:25] <gonzo_> here are quite a few other sat allocations thopugh
[09:26] <AndyEsser> fsphil: we agreed that you can't see Snowdon, didn't we?
[09:26] <gonzo_> we've talked about putting an SDR on the hill near us here. Where the AR beacons are sited
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[10:47] <SpacenearUS> New position from 03HIRFW-3 after 036 days silence - 12https://tracker.habhub.org/#!qm=All&q=HIRFW-3
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[11:07] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[13:00] <SpacenearUS> New position from 03WB8ELK-2 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=WB8ELK-2
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[13:18] <SpacenearUS> New position from 03VE2WMG-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=VE2WMG-11
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[15:01] <SpacenearUS> New vehicle on the map: 03K2JJI-11 - 12https://tracker.habhub.org/#!qm=All&q=K2JJI-11
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[15:07] <SpacenearUS> New vehicle on the map: 03GKCDNB - 12https://tracker.habhub.org/#!qm=All&q=GKCDNB
[15:14] <kc2uez> yai, K2JJI-11 is the balloon I worked on
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[15:20] <dennis__> Hello all, I've a question. How do I cancel a flight?? We change the flight date because of the bad weather.. I hope someone can help
[15:21] <gonzo_> go to #habhub and ask
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[15:55] <SpacenearUS> New vehicle on the map: 03KC3BJG-11 - 12https://tracker.habhub.org/#!qm=All&q=KC3BJG-11
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[16:34] <Laurenceb> !whereis K6RPT-12
[16:34] <SpacenearUS> 03Laurenceb: I haven't got a clue
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[16:34] <Laurenceb> !whereis K6RPT-11
[16:34] <SpacenearUS> 03Laurenceb: 03K6RPT-11 was over 03Sarthe, France 10(47.9814,0.59351) at 0315627 meters about 0332 minutes ago
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[17:03] <SpacenearUS> New vehicle on the map: 03Kc2uez-9_chase - 12https://tracker.habhub.org/#!qm=All&q=Kc2uez-9_chase
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[17:37] <SpacenearUS> New vehicle on the map: 03BDBC7 - 12https://tracker.habhub.org/#!qm=All&q=BDBC7
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[18:22] <fsphil> AndyEsser: yeah, a link between snowdon and the mountains south of belfast would be possible, and those hills are visible from here
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[18:22] <fsphil> but I don't know anyone down there who could install something like that
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[18:36] <SP9UOB-Tom> evening all
[18:36] <SpacenearUS> New position from 03SP9UOB-rs41 after 036 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB-rs41
[18:37] <SA6BSS-Mike> evening
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[18:38] <SA6BSS-Mike> the last one did shutof after 5700m?
[18:39] <SA6BSS-Mike> did it recover durif decent? recover it?
[18:40] <SP9UOB-Tom> SA6BSS-Mike: GPS problem in vaisala radiosonde
[18:40] <SA6BSS-Mike> ok
[18:40] <SP9UOB-Tom> I've fixed it (i hope ;-)
[18:41] <SA6BSS-Mike> yeah, lest try again :)
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[18:41] <SP9UOB-Tom> SA6BSS-Mike: no, these are vaisala radiosondes with my custom firmware, these are literally free - so no need to recover
[18:41] <SP9UOB-Tom> SA6BSS-Mike: they just falling from the sky ;-)
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[18:42] <SA6BSS-Mike> it looks like they will start sending up those rs41 here sometime next spring
[18:43] <SP9UOB-Tom> :-)
[18:43] <SA6BSS-Mike> when they run out of the rs92
[18:43] <SA6BSS-Mike> how much does it weig?
[18:44] <SP9UOB-Tom> 117g with 2 energizer lithiums
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[18:45] <SP9UOB-Tom> SA6BSS-Mike: they also can do SSDV ;-) https://www.youtube.com/watch?v=BfugrVBCA98
[18:45] <SA6BSS-Mike> ok'
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[18:47] <SA6BSS-Mike> ha, cool!
[18:48] <SP9UOB-Tom> :-)
[18:51] <SP9UOB-Tom> piece of decent hardware :-)
[18:52] <Vostok> SP9UOB-Tom: firmware somewhere?
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[18:55] <SP9UOB-Tom> Vostok: are you the one who is working in Vaisala ;-) ?
[18:55] <SP9UOB-Tom> for Vaisala
[18:55] <SP9UOB-Tom> i mean
[18:55] <Vostok> :D yes
[18:56] <SP9UOB-Tom> well...
[18:56] <SP9UOB-Tom> ;-)
[18:56] <SP9UOB-Tom> not yet - still in early alpha stage
[18:56] <PE2BZ> So maybe all RS-41´s will transmit SSDV in the future :-)
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[18:57] <PE2BZ> Pressure, Temperature, Humidity and the clouds seen from above
[18:57] <SP9UOB-Tom> Vostok: is there any chance to get the documentation? im interested in temperature/humidity reading
[18:58] <SP9UOB-Tom> Currently im working on pressure reading :-)
[18:58] <Vostok> i'm afraid not
[18:59] <SP9UOB-Tom> i was suspecting that
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[19:09] <Laurenceb> anyone here any good with machine shop skills?
[19:10] <Laurenceb> I've got some 304 stainless steel longitudinally welded tube, need to debur the weld on the inside
[19:11] <mattbrejza> how wide is the tube?
[19:12] <Laurenceb> 22.2mm OD
[19:12] <mattbrejza> cant you just put some sandpaper on a stick...
[19:12] <Laurenceb> 19.9mm
[19:12] <Laurenceb> it needs to be accurate
[19:12] <Laurenceb> I was considering making a sanding tool for a drill
[19:12] <Laurenceb> but I'm worried it will result in inconsistent internal diameter
[19:13] <miek> how long is it?
[19:13] <Laurenceb> 250mm
[19:14] <mattbrejza> https://youtu.be/kbcNlpZ_nCI?t=11m50s
[19:15] <Laurenceb> interesting, thanks
[19:16] <mattbrejza> cusf had to solve a similar problem recently to fit the electronics inside the dart, not sure how they solved it ( adamgreig ? )
[19:16] <adamgreig> lol
[19:16] <adamgreig> it's awful Laurenceb
[19:16] <adamgreig> just give up
[19:16] <adamgreig> we used an EDM machine
[19:16] <adamgreig> I recommend buying a better tube
[19:16] <Laurenceb> mattbrejza: yeah that was a little different, no burr there
[19:17] <Laurenceb> I'm worried the burr will make everything go off circular
[19:17] <Laurenceb> adamgreig: ok lol
[19:17] <adamgreig> though tbh 250mm is not that bad, couldn't you lathe it or is the ID too small to get a tool in?
[19:17] <adamgreig> anyway it's horrid and we had twice the ID to work with
[19:17] <Laurenceb> its on the borderline of poss with a lathe
[19:17] <Laurenceb> yeah there seems to be a massive difference with tube quality
[19:18] <Laurenceb> everything I can find is longitudinally welded
[19:18] <Laurenceb> but it looks like some uses a mandrel during welding
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[19:23] <Laurenceb> might have to pay someone to bore out some tube with thicker walls :-/
[19:25] <SpeedEvil> Do you actually need SS?
[19:26] <SpeedEvil> Is this to fly?
[19:28] <Laurenceb> yes
[19:28] <Laurenceb> well stainless has the advantage of no corrosion
[19:28] <Laurenceb> Alu might just be possible
[19:38] <Laurenceb> http://www.ebay.co.uk/itm/Aluminium-Round-Tube-8mm-10mm-12mm-15mm-16mm-20mm-22mm-25mm-30mm-35mm-40mm-45mm-/271400179192?var=&hash=item3f30b615f8:m:m7CBuItPSl20_itKr7ToLAw
[19:38] <Laurenceb> aha
[19:38] <Laurenceb> that will be extruded tho, but should be much easier to polish the inside
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[19:49] <SpeedEvil> plus, rather lighter
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[20:21] <Laurenceb> yeah saves 100grams
[20:21] Action: Laurenceb is making rockoon launch tubes
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[20:26] <SP9UOB-Tom> please approve : e6d4e700600c5e7f8af6e4f62b4ece20
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[20:44] <SpacenearUS> New position from 03IK8SUT-11 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=IK8SUT-11
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[23:07] <SpacenearUS> New vehicle on the map: 03ZL1AB - 12https://tracker.habhub.org/#!qm=All&q=ZL1AB
[23:08] <SpacenearUS> New position from 03IV3SRD-11 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[00:00] --- Sat Nov 19 2016