highaltitude.log.20210827

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[00:47] <SpacenearUS> New position from 03NOB8 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB8
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[02:11] <SpacenearUS> New position from 03NOB9 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB9
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[02:58] <SpacenearUS> New position from 03NOB10 after 0320 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB10
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[06:52] <SpacenearUS> New position from 03N0MPM-13 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N0MPM-13
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[07:45] <SpacenearUS> New position from 03ttnwiv4n after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=ttnwiv4n
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[09:28] <GaryMortimer> Hello all, a long long time since I have fired up the map, I see loads of things network receivers and a balloon, is the current best practice??
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[09:32] <GaryMortimer> Ah found this post https://www.thethingsnetwork.org/forum/t/ttnwiv4n-balloon-tracker/50982/12
[09:35] <GaryMortimer> I remember now why I left TTNW to it years ago, pretty unfriendly crowd!
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[09:48] <SpacenearUS> New vehicle on the map: 03SQ3MQD-4FSK - 12https://tracker.habhub.org/#!qm=All&q=SQ3MQD-4FSK
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[10:06] <daveake> It's all a bit "ohmigod APRS balloon with bad WIDE setting"
[10:07] <daveake> I've thought of doing a lorawan flight but ... meh CBA really
[10:12] <VK5QI> im gonna throw one up on our next launch to see if we can get some distance records
[10:28] <daveake> Cool
[10:29] <daveake> I've got an OGN (glider) tracker for pretty much the same purpose
[10:29] <daveake> At least those are normally airborne so I won't be doing that much different :p
[10:29] <VK5QI> we got a pretty crazy distance last time i flew one, but that flight only hit 30km or so
[10:29] <VK5QI> will e using a 1600g for the next flight
[10:29] <daveake> 30km is so 2010 :p
[10:33] <VK5QI> lol
[10:33] <VK5QI> i know
[10:33] <VK5QI> i used a 1000g, and the weights worked out that i could just dump in 3.6m^3 and get roughly the flight i wanted
[10:34] <VK5QI> so thats what i did
[10:34] <daveake> "Nobody will ever get above 38km"
[10:34] <VK5QI> haha
[10:34] <VK5QI> i mean, its not easy
[10:34] <VK5QI> it does take a *bit* of effort to do it right
[10:34] <daveake> Nah, but Hwoyee helped. And H2. And small trackers.
[10:35] <daveake> Beyond that it's getting the right fill and then just luck
[10:40] <VK5QI> mm
[10:40] <VK5QI> havent used H2 here yet
[10:41] <VK5QI> need to check out the prices again
[10:46] <daveake> He has gone a bit silly
[10:47] <JohnLaidler> I've come in for a bit of stick over my ttnwiv4n flight in recent days on the TTN Forum.;( It is transmitting every 30 seconds for no better reasons than this was the interval used in the code I found and because other launches have also used this interval. However, a typical GPS data packet takes about 60ms to send and the TTN have a Fair Use
[10:47] <JohnLaidler> policy of a maximum of 30 seconds a day. If you do the maths an interval not less than once every two minutes for a solar powered payload should come under this 30 second limit. Discussions continue but the idea is to come up with some "Best Practice" advice for future TTN balloons. My inclination is to use a variable interval based on altitude so
[10:47] <JohnLaidler> the higher it goes the less frequent the transmissions because flights above say 30,000m can light up half of Europe. For a latex balloon the interval could perhaps be set to reduce again as it approached the expected burst altitude. Work in progress at the moment but suggestions welcome.
[10:47] <daveake> Plus there's always the chance of someone tutting at you for using a limited resource :)
[10:47] <daveake> Had this on a school flight where H&S wouldn't let me use H2
[10:48] <daveake> And the occupier of the nearest house complained about the use of helium :)
[10:48] <daveake> Yes I'd go for fewer packets at altitude
[10:49] <daveake> For burst, rather than change the rate, just include burst alt in the telemetry
[10:52] <VK5QI> i made sure to wind my interval back to meet the 30 second total airtime limit
[10:52] <VK5QI> but i do get their point about decreasing transmissions at altitude. you hit a *lot* of stations
[10:53] <VK5QI> as evidenced by all teh new antennas showing up on the tracker
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[11:03] <Rebounder> complained about the helium?
[11:04] <Rebounder> 30s <5000m, 60s>5000 ?
[11:04] <Rebounder> (guessing)
[11:04] <VK5QI> more than that
[11:05] <VK5QI> minimum should be whatever meets the 30 second air time limit
[11:05] <VK5QI> which IIRC is about 2 minutes
[11:06] <Rebounder> aah
[11:07] <Rebounder> SF7 default?
[11:09] <Rebounder> i like the uplink is defined in seconds and downlink in messages
[11:15] <SpacenearUS> New vehicle on the map: 03PA3FNT-4FSK - 12https://tracker.habhub.org/#!qm=All&q=PA3FNT-4FSK
[11:16] <daveake> @Rebounder Yeah ... we had the landing point, on someone's land, found the nearest house and asked if it was OK to go and collect. Which was fine. In chatting, I mentioned it was a helium not hot air balloon. "Oh, helium? That's a limited resource that you're wasting!". I explained that I normally fly H2 but once you get H&S involved then there's only one outcome.
[11:18] <JohnLaidler> The TTN limit is a maximum of 10 downlink message a day and 30 seconds of uplink, as in uplinking to the TTN network. Having a fixed SF7 I've also learned isn't compliant either.
[11:20] <SpacenearUS> New vehicle on the map: 03PA3FNT-RTTY - 12https://tracker.habhub.org/#!qm=All&q=PA3FNT-RTTY
[11:23] <JohnLaidler> I see hysplit has been run again for ttnwiv4n - many thanks whoever did this!
[11:23] <VK5QI> it runs automatically
[11:30] <Rebounder> daveake: aah
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[12:37] <SpacenearUS> New position from 03SP6QKM-4FSK after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=SP6QKM-4FSK
[12:42] <SpacenearUS> New vehicle on the map: 03GSN-TS-4FSK - 12https://tracker.habhub.org/#!qm=All&q=GSN-TS-4FSK
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[13:04] <SpacenearUS> New position from 03GSN-TS after 0313 days silence - 12https://tracker.habhub.org/#!qm=All&q=GSN-TS
[14:00] <SpacenearUS> New vehicle on the map: 03OK4DAN_chase - 12https://tracker.habhub.org/#!qm=All&q=OK4DAN_chase
[14:09] <SpacenearUS> New position from 03K6WFV-5 after 0321 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K6WFV-5
[14:22] <SpacenearUS> New vehicle on the map: 03AnnaChase_chase - 12https://tracker.habhub.org/#!qm=All&q=AnnaChase_chase
[14:27] <SpacenearUS> New vehicle on the map: 03Annachase2 - 12https://tracker.habhub.org/#!qm=All&q=Annachase2
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[17:30] <SpacenearUS> New vehicle on the map: 03K9GXP-11 - 12https://tracker.habhub.org/#!qm=All&q=K9GXP-11
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[18:49] <SpacenearUS> New vehicle on the map: 03DL1XH-4FSK - 12https://tracker.habhub.org/#!qm=All&q=DL1XH-4FSK
[19:12] <SpacenearUS> New position from 03SQ6NEI-4FSK after 039 days silence - 12https://tracker.habhub.org/#!qm=All&q=SQ6NEI-4FSK
[19:18] <SpacenearUS> New position from 03DH3SUP-4FSK after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=DH3SUP-4FSK
[19:32] <SpacenearUS> New vehicle on the map: 03W0OAH-5 - 12https://tracker.habhub.org/#!qm=All&q=W0OAH-5
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[20:17] <SpacenearUS> New position from 03W8VPV-1 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W8VPV-1
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[00:00] --- Sat Aug 28 2021