highaltitude.log.20211107

[00:34] <SpacenearUS> New vehicle on the map: 03SQ9MAS-12 - 12https://tracker.habhub.org/#!qm=All&q=SQ9MAS-12
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[06:42] <OZ1SKY_Brian> gm
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[08:15] <SpacenearUS> New vehicle on the map: 03DG4NOB-13 - 12https://tracker.habhub.org/#!qm=All&q=DG4NOB-13
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[09:45] <OZ1SKY_Brian> VK5QI Hi Mark, off topic but VK in on 10m here
[09:46] <VK5QI> nowhere near my station right now
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[09:57] <OZ1SKY_Brian> VK5QI RRR no problem
[09:58] <OZ1SKY_Brian> VK5QI btw AFB have switched to RS41 here
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[10:43] <SpacenearUS> New vehicle on the map: 03DB0BKN - 12https://tracker.habhub.org/#!qm=All&q=DB0BKN
[10:57] <SpacenearUS> New position from 03NOB8 after 0317 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB8
[11:10] <SpacenearUS> New position from 03BZ-BEACON-L after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BZ-BEACON-L
[11:21] <SpacenearUS> New position from 03BZ-BEACON-R after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BZ-BEACON-R
[11:27] <SpacenearUS> New position from 03DH3SUP-4FSK after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=DH3SUP-4FSK
[11:39] <SpacenearUS> New position from 03N4XWC-1 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[14:41] <SpacenearUS> New position from 03W3UAV-20 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W3UAV-20
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[15:11] <SpacenearUS> New vehicle on the map: 03KI5DWC-1 - 12https://tracker.habhub.org/#!qm=All&q=KI5DWC-1
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[15:32] <SpacenearUS> New vehicle on the map: 03KI5DWC-3 - 12https://tracker.habhub.org/#!qm=All&q=KI5DWC-3
[15:35] <LeoBodnar> tell VE3KCL-25 that HAM radio use over UK is illegal
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[16:09] <SpacenearUS> New vehicle on the map: 03KJ7WWF-4 - 12https://tracker.habhub.org/#!qm=All&q=KJ7WWF-4
[16:33] <SpacenearUS> New vehicle on the map: 03KI5DWC-2 - 12https://tracker.habhub.org/#!qm=All&q=KI5DWC-2
[16:34] <SpacenearUS> New position from 03SA6BSS-7 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=SA6BSS-7
[16:43] <SA6BSS-Mike> LeoBodnar: my "washed" diy balloon just popped up over US , still at 12km , tnx for all the help the other week!
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[17:21] <SpacenearUS> New vehicle on the map: 03NL13974 - 12https://tracker.habhub.org/#!qm=All&q=NL13974
[17:26] <SpacenearUS> New vehicle on the map: 03KO4IZP-11 - 12https://tracker.habhub.org/#!qm=All&q=KO4IZP-11
[17:32] <LeoBodnar> yeah nps! glad it is going strong :) SA6BSS-Mike
[17:33] <SA6BSS-Mike> :) the washed Grabo foil with 5,5 gram fl got a ful lap, now on its second lap, the 4 gram fl washed Grabo went down over the Atlantic when it left Eastern US last week
[17:33] <LeoBodnar> I use 250mAh LiPo and 2xsolar cells in series > what solar setup are you using? I see you get very low solar startup and dwon, I reccon you use a battery, but how many cells, flat , angled?
[17:34] <SA6BSS-Mike> on the -7 flight I use 6x 39x19 tilted and a 0,6gram magnet to point it to south
[17:34] <SA6BSS-Mike> 4,6 total tracker weight
[17:35] <SA6BSS-Mike> 4,6g
[17:35] <LeoBodnar> I have not really settled on power source setup yet
[17:35] <SA6BSS-Mike> so it seems I get sub 4° shutdown angle
[17:36] <LeoBodnar> my setup goes through the night but without GPS use
[17:36] <SA6BSS-Mike> it have not been close to a aprs gateway yet so I could see startup but Im guessing about 7-8 °
[17:36] <SA6BSS-Mike> aha, thats interesting
[17:37] <LeoBodnar> https://aprs.fi/telemetry/a/M0XER-9?range=day is now near Japan but not sure exactly where :)
[17:37] <LeoBodnar> -61C
[17:37] <SA6BSS-Mike> how does you "tell" the fw it should shift to night mode?
[17:37] <LeoBodnar> when the solar panel voltage drops below 1V
[17:37] <SA6BSS-Mike> well, aprs is los so near any of the rx station
[17:37] <SA6BSS-Mike> rr
[17:37] <SA6BSS-Mike> looking....
[17:38] <LeoBodnar> yeah it's within 400km radius off the North tip of Japan, probably North, otherwise we would have seen more igates
[17:39] <LeoBodnar> next stop is CA/US, we will know more from the backlogs
[17:39] <SA6BSS-Mike> yes
[17:39] <SA6BSS-Mike> what prefix?
[17:39] <SA6BSS-Mike> -9
[17:39] <SA6BSS-Mike> I see it
[17:41] <SA6BSS-Mike> this is interesting, will forward this to dg4nob, he wants to do a "over night" tracker
[17:41] <LeoBodnar> I am not too fussed about where it is now but I'd like to know where it's been at some point and if it makes it to good APRS coverage over daytime we will
[17:41] <LeoBodnar> backlog is 20+ days so it's fine
[17:41] <SA6BSS-Mike> rr
[17:43] <SA6BSS-Mike> I have made quite a large area arround Japan to jap aprs geofence as its the only really good aprs covarage before it leaves Asia
[17:44] <SA6BSS-Mike> hm, how does it knw how to tx on jap aprs whn gps is not online?
[17:44] <LeoBodnar> this is a hysplit from 10 days ago when it was over Canada and it's pretty clode https://usercontent.irccloud-cdn.com/file/dauEXlzz/hysplit-9.png
[17:44] <SA6BSS-Mike> did it come into jap aprs before the sun went down
[17:45] <SA6BSS-Mike> probably the above then
[17:45] <LeoBodnar> nope, in the middle of the night but it must have switched Freq some time after the sunset
[17:46] <LeoBodnar> yeah my Jap geofence is quite large
[17:47] <LeoBodnar> Chinese used to have quite a few good APRS stations 10 years ago, now they seem to be moving to digital modes
[17:49] <SA6BSS-Mike> have only got a few package whn passing Beijing where most of my boards travel this time of year, going more south over China I usually have a decent covarege
[17:51] <SA6BSS-Mike> for fun on your -9 https://www.ready.noaa.gov/hypubout/151650_trj001.gif
[17:52] <SA6BSS-Mike> Wednesday it will be over US
[17:54] <SA6BSS-Mike> by the way, where do you get your batteries?
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[17:55] <SA6BSS-Mike> how much does it weigh?
[17:55] <SA6BSS-Mike> next up will be a wspr flight with a magnet , lets see how that works out with tilted cells an d a magnet :)
[17:56] <LeoBodnar> it's about 6g and I got a batch of a few in 2014 and still using those, I don't think there was asnything special about them even though the seller claimed they were "low temp"
[17:56] <SA6BSS-Mike> ok
[17:56] <LeoBodnar> they stil can provide only a few mA at -40C and below
[17:57] <LeoBodnar> so the search for low temp battery/supercaps is still on
[17:57] <SA6BSS-Mike> hm, cahrge a SC to voltage and release?
[17:57] <LeoBodnar> I have a thermal chamber that goes to -55C so I use that for initial testing
[17:58] <SA6BSS-Mike> rr, I heard someone used a small fridge inside a larger fridge to get down to -60 :)
[17:58] <LeoBodnar> I meant hybrid supercaps, not EDLCs
[17:58] <LeoBodnar> that was probably me :D
[17:58] <SA6BSS-Mike> ok :)
[17:59] <LeoBodnar> it can go to -60C but only if I use room aircon to cool it to +15C :)
[17:59] <SA6BSS-Mike> the simplest thing you never even think about!
[17:59] <SA6BSS-Mike> rr
[18:00] <LeoBodnar> and tbh by -45C things are already looking dire
[18:02] <SA6BSS-Mike> 6 gram is heavy , but I forward the info about the gps shutoff and to search for low temp bat
[18:02] <LeoBodnar> I feel that if you only target half a dozen position fixes during the night you can use EDLC and even APRS will work but not WSPR or anything that take more than few seconds of TX
[18:02] <SA6BSS-Mike> yeah
[18:02] <SA6BSS-Mike> didnt I see -9 tx over canada last week for several hours?
[18:02] <SA6BSS-Mike> with gps fix
[18:03] <LeoBodnar> yeah it was there 9 days ago
[18:03] <LeoBodnar> it fires GPS even after the sunset until battery dropps to 3V
[18:04] <SA6BSS-Mike> aha
[18:04] <LeoBodnar> depending on the temperature it can be anything from one to five hours
[18:04] <SA6BSS-Mike> ok, it was in the middel of the night so, ok!
[18:04] <LeoBodnar> it's about 40-50min interval between GPS fixes
[18:05] <LeoBodnar> and between those it transmits positionless telemetry only: voltages and temperaure
[18:06] <SA6BSS-Mike> thats all we need to know :) its alive packages
[18:06] <LeoBodnar> yeah
[18:06] <LeoBodnar> I would have used pressure too but below -50C pretty much all pressure sensors are useless
[18:06] <LeoBodnar> without good individual calibration
[18:08] <SA6BSS-Mike> have you done any flights with pressure sensor? the only thing that could be interesting would be if we could see any
[18:08] <LeoBodnar> thanks for the hysplit, Wednesday then
[18:09] <SA6BSS-Mike> hm, whats the word
[18:09] <LeoBodnar> yeah I have done a few with one inside, one outside the envelope
[18:09] <LeoBodnar> back in 2013
[18:10] <SA6BSS-Mike> ok, did you see any data that could explain the day to day change in altitude?
[18:10] <SA6BSS-Mike> *explain
[18:11] <LeoBodnar> at that time I have not figured that Aluminium needs to be stripped so there was a lot of solar pressure gain
[18:11] <SA6BSS-Mike> ah
[18:11] <LeoBodnar> and longest flight was two days :D
[18:12] <SA6BSS-Mike> thats one of the few Qs left how to forsee the change in altitude over alonger durasion flight the alt can varry 800m or more
[18:12] <SA6BSS-Mike> :)'
[18:13] <LeoBodnar> how much do you trust your GPS?
[18:13] <LeoBodnar> is it AMSL or height over ellipsoid?
[18:13] <SA6BSS-Mike> I trust it :)
[18:13] <SA6BSS-Mike> amls
[18:13] <SA6BSS-Mike> amsl, lol
[18:14] <LeoBodnar> need radar altimeter
[18:14] <SA6BSS-Mike> did this video a few years ago, what do you think ? is it the warmer air in the balloon ? https://www.youtube.com/watch?v=M98AvPgDKvQ
[18:15] <SA6BSS-Mike> coler more dence air with more air molcules to work against?
[18:15] <LeoBodnar> I don't know how ublox corrects for AMSL
[18:16] <SA6BSS-Mike> also, * warmer He in the ballon
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[18:17] <LeoBodnar> interesting, are two rooms truly isobaric?
[18:18] <SA6BSS-Mike> whn I go out its outside
[18:18] <SA6BSS-Mike> cold maby 8°
[18:19] <LeoBodnar> my thinking is that warm balloon warms up cold air just outside its skin, that air starts rising and takes the balloon with it
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[18:20] <LeoBodnar> so it's a sort of air drag rather than airstatic thing
[18:20] <SA6BSS-Mike> it he in the ballon a nd Im thinking the warmer he have highrt lifting force as a hot air ballon
[18:21] <SA6BSS-Mike> going from inside with warmer air surroung the balloon fewer iar molucelues for the balloon to work agians , as air and most gase expand with heat
[18:21] <LeoBodnar> but He temperature would not have changed significantly
[18:21] <SA6BSS-Mike> exactly
[18:22] <SA6BSS-Mike> it would stil be warm and going outside to a 8° surrounding it would have lots more air molecules to work against as cold air is more dence+
[18:22] <LeoBodnar> if you let balloon to cool down to ambient the lifting force should be the same - inside or outside
[18:23] <SA6BSS-Mike> if I had let the balloon cool it would probably have fallen down yes, need to test this some time :)
[18:23] <LeoBodnar> so year the air oustide is denser even if the pressure is the same inside/outside
[18:23] <SA6BSS-Mike> yes, thats my thought
[18:25] <LeoBodnar> this is why it might be dangerous to take of in an overloaded airplane on a hot humid day
[18:26] <LeoBodnar> both temeprature and humidity reduce the air density
[18:27] <SA6BSS-Mike> yes, never know this could be dangerous :)
[18:28] <SA6BSS-Mike> anyway, tnx for the chatt, the kids left an hour ago for their mom so its Netflix time :)
[18:28] <LeoBodnar> rgr! :)
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[19:06] <jacoxon> been nosltalgicly working through the wiki
[19:06] <jacoxon> good memories
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[19:24] <SpacenearUS> New vehicle on the map: 03EA3HCR_chase - 12https://tracker.habhub.org/#!qm=All&q=EA3HCR_chase
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[23:33] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
[23:37] <SpacenearUS> New position from 034FSKTEST after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=4FSKTEST
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[00:00] --- Mon Nov 8 2021