highaltitude.log.20210725

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[02:05] <SpacenearUS> New vehicle on the map: 03HORUSBINARY - 12https://tracker.habhub.org/#!qm=All&q=HORUSBINARY
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[03:22] <g7gpr1> Is there a list of the telemetry types in use for vehicles? APRS, WSPR, 70cm SSB FSK, LoRA etc?
[03:26] <VK5QI> eh?
[03:26] <VK5QI> i mean, thats kind of abstracted away from the habitat db a bit
[03:26] <VK5QI> as long as you can get telemeetry into a string which habitat can parse, it'll work
[03:26] <VK5QI> e.g. $$HORUSBINARY,65,03:26:32,-34.72631,138.75229,1529,87,209,27,1.45*F531
[03:26] <VK5QI> APRS works differently though, thats kind of a bolt-on to the tracker itself
[03:32] <SpacenearUS> New position from 03K4UAH-6 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K4UAH-6
[03:44] <g7gpr1> I want to build a station that can receive any data from balloons and pass it to the habitat db. To do that, I need to know what transmissions I'm looking for. I'm sure someone must have produced a simple document, maybe a couple of sides with the highlights. I just can't find it.
[03:51] <VK5QI> g7gpr1: your best approach is just running a WSPR receiver
[03:51] <VK5QI> i think we've discussed this before
[03:52] <VK5QI> any other mode is going to only be useful to receive if you already know there is a balloon near you
[03:52] <VK5QI> or you have advance warning of something
[03:53] <VK5QI> runing WSPR on say 20m will cover most of the floaters that are in the air at the moment. you just need to run a regular WSPR receiver and upload to wsprnet, as the positional data is scraped from there and put into habitat
[03:54] <VK5QI> for APRS, you just run an APRS receiver. as long as the balloon is using the right frequency and it passes near you youl'l hear it, and it'll end up on APRS And make its way into habitat from there
[04:09] <g7gpr1> I'm in Adelaide at the moment, when I get back to WA, I'll get WSPR and APRS running. I suppose that if I do discover that a balloon is going to be near me, I want to have the equipment constructed and ready to go.
[04:17] <VK5QI> theres a balloon in teh air right now :-)
[04:17] <VK5QI> 434.200 MHz, running the Horus Binary 4FSK mode
[04:18] <VK5QI> however it is heading to the east at almost 200kph
[04:19] <VK5QI> realistically, apart from WSPR and APRS, your best bet is to just have a receiver capable of 70cm handy, and a laptop to load up appropriate software
[04:19] <VK5QI> e.g. horus-gui for these 4FSK payloads, dl-fldigi for RTTY
[04:20] <VK5QI> if its a LoRa payload, you can hope that they are using some 'standard' lora mode like daveakes stuff,but if not then you're out of luck
[04:36] <g7gpr1> I saw that you were up to something earlier. I'd like to have a small box with a few SMA connectors on that would do everything. Then I can just chuck it in my bags and set up a station wherever I am.
[04:36] <VK5QI> yeah thats a bit difficult,
[04:37] <VK5QI> especially for stuff on 70cm. you dont necessarily know the frequency in advance
[04:37] <g7gpr1> I like difficult.
[04:37] <VK5QI> the best thing i've found is ust to have a few SDR options and a laptop
[04:38] <VK5QI> if you get word of a balloon heading your way, fire up the appropriate decoding software
[04:39] <g7gpr1> Yeah - that's kind of the idea; a few SDRs in a box, maybe a couple of preamps and a rPi or two.
[04:39] <g7gpr1> And a laptop.
[04:46] <VK5QI> i mean, APRS and WSPR can be automated. but the other stuff should really just be on-demand
[04:46] <VK5QI> because 99.99% of the time there will be zero point running it
[04:47] <VK5QI> probably add a few 9's there
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[04:47] <VK5QI> just keep an ear out for balloon launches, and hope that whoever is doing them publicises their frequency and modulation information
[05:04] <VK5QI> g7gpr1: another one will be going up from here shortly
[05:04] <VK5QI> 434.2 MHz
[05:07] <SpacenearUS> New vehicle on the map: 03HORUSBINARY2 - 12https://tracker.habhub.org/#!qm=All&q=HORUSBINARY2
[05:37] <VK5QI> g7gpr1: its in the air :-)
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[07:27] <g7gpr1> VK5QI: Beautiful...
[07:28] <VK5QI> its a long way away now
[07:31] <g7gpr1> Interstate.
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[09:27] <SpacenearUS> New vehicle on the map: 03VK5TRA_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5TRA_chase
[09:53] <SpacenearUS> New vehicle on the map: 03DL2SEK-13 - 12https://tracker.habhub.org/#!qm=All&q=DL2SEK-13
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[10:56] <SpacenearUS> New vehicle on the map: 03PC4L-R - 12https://tracker.habhub.org/#!qm=All&q=PC4L-R
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[10:59] <SpacenearUS> New vehicle on the map: 03PC4L-L - 12https://tracker.habhub.org/#!qm=All&q=PC4L-L
[11:11] <SpacenearUS> New position from 03KE8JIE-12 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KE8JIE-12
[11:24] <SpacenearUS> New position from 03N4XWC-1 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
[11:44] <SpacenearUS> New vehicle on the map: 03SP8PL - 12https://tracker.habhub.org/#!qm=All&q=SP8PL
[12:08] <SpacenearUS> New vehicle on the map: 03ARNIE_Chase - 12https://tracker.habhub.org/#!qm=All&q=ARNIE_Chase
[12:09] <SpacenearUS> New vehicle on the map: 03SP8XXT-12 - 12https://tracker.habhub.org/#!qm=All&q=SP8XXT-12
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[12:13] <OZ1SKY_Brian> does anyone have a recording of a MRZ, how it sounds ?
[12:14] <SpacenearUS> New vehicle on the map: 03kc3fxx_chase - 12https://tracker.habhub.org/#!qm=All&q=kc3fxx_chase
[13:10] <SpacenearUS> New vehicle on the map: 03TA2MUN-15 - 12https://tracker.habhub.org/#!qm=All&q=TA2MUN-15
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[13:18] <vincentsant> hi there!
[13:19] <vincentsant> i made a few attempts at hab 5 years ago and recently stumble upon the website I set up for them: http://www.up-in-the-air.com.s3-website-eu-west-1.amazonaws.com/
[13:20] <vincentsant> it gave me the desire to try again
[13:20] <vincentsant> so i made a new tracker design. some of you would be kind enough to give it a look and give me some feedback ?
[13:20] <VK5QI> OZ1SKY_Brian: yes, eill email
[13:21] <OZ1SKY_Brian> Thanks :-)
[13:23] <vincentsant> New design is made for solar autonomy and Lora transmission: it is base on SPV1040 and LORA-E5: http://www.up-in-the-air.com.s3-website-eu-west-1.amazonaws.com/Up4.pdf
[13:23] <vincentsant> Any feedback greatly appreciated! Thks
[13:31] <OZ1SKY_Brian> got it, thanks
[13:46] <SpacenearUS> New position from 03VE3OCL-19 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=VE3OCL-19
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[14:22] <SpacenearUS> New position from 034FSKTEST after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=4FSKTEST
[14:23] <PE2BZ> vincentsant, what processor ? And I see no trace of any type of TX module ?
[14:25] <SA6BSS-Mike1> vincentsant: you should probably get away with usina any simple charge boost instead of the 1040, that would really simplify the construction and make alot cheaper
[14:27] <SA6BSS-Mike1> then you will have 3.3v directlty from 4 cells and and only 4 componets (charege ic + 3 caps)
[14:31] <vincentsant> PE2BZ, LORA-E5 includes a STM32WLE5J8, which has Arm®Cortex®-M4 MCU + LORA TX. That's what makes it cool in my opinion.
[14:33] <vincentsant> SA6BSS-Mike1, that makes sense. SPV1040 seems to be out of stock until 2022 and I only have a couple left. Which charge boost have you in mind?
[14:40] <SA6BSS-Mike1> reg710 or HX4002b
[14:43] <vincentsant> reg710 looks very nice with just 3 small caps! HX4002b would require more than 4 cells, no?
[14:44] <PE2BZ> no :-)
[14:44] <PE2BZ> 1.8 V minimum for 3.3 v regulated output
[14:45] <vincentsant> ha ha, I was looking at datasheet for HX4002, not HX4002b...
[14:45] <vincentsant> 2 great options then!
[14:45] <vincentsant> from your experience, how much do you loose by not having MPPT?
[14:46] <PE2BZ> I saved lots of Euros by stopping those mppt pcb experiments....
[14:47] <vincentsant> ha ha! my previous attempts with SPV1040 failed, and I think I loose one over two when soldering them!
[14:48] <vincentsant> Should I connect the super cap before the charge boost then? So I can use once rated 3V only.
[14:48] <PE2BZ> What´s the supercap value ?
[14:49] <vincentsant> 3V
[14:49] <PE2BZ> In Farad please ;-)
[14:49] <vincentsant> 1F
[14:50] <PE2BZ> In fron of the charge boost. Did you ever test the charging current for 1 F capacitor ? The hx4002b did not like that over here. current limiter gave it over 20 minutes to charge the supercap in full sunlight.
[14:50] <SA6BSS-Mike1> no super cap! most likely no need
[14:50] Action: PE2BZ likes supercaps for rotating payloads
[14:50] <SA6BSS-Mike1> ofc you do :)
[14:50] <PE2BZ> https://www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html
[14:51] <SA6BSS-Mike1> how big is your cells?
[14:51] <PE2BZ> This one ? Nice price ! So there could be LoRa wan support in 868 and radio amateur lora in 434 support ?
[14:51] <vincentsant> Yes this one
[14:51] <PE2BZ> SA6BSS-Mike1, you don´t ask that....
[14:51] <PE2BZ> I only have 2 braincell
[14:51] <PE2BZ> so not that big ;-)
[14:51] <SA6BSS-Mike1> haha :)
[14:52] <PE2BZ> Heavy thunderstorm over here atm
[14:52] <vincentsant> single cell 19x78mm
[14:53] <vincentsant> i don't have the supercap yet so i can change ;-)
[14:53] <PE2BZ> 78 mm ? wos. For 22 dBm output that might be good, but for 10 or 15 dBm I would go for smaller size.
[14:54] <vincentsant> ok, what supercap do you think would be good then?
[14:55] <PE2BZ> I tend to order the double packed 5 Volt 1 F, those contain 2 X 2F 3V in a shrink foil, which I seperate. Tested 2 of them for 24 hours on a bench supply at 3v3 and neither one blew up.
[14:57] <vincentsant> but with 4 cells and the supercap in front of the charger, I should be well bellow the 3V anyway, no?
[14:58] <PE2BZ> But about the supercap, as Mike says, usually not necessary. My 2 F (one of the 2 in series, from the shrink foil) keeps my LoRa RTTY tracker running for 10 minutes after sun disappears. So Tantalium SMD, 220 or 470 uF would be good too
[14:58] <SA6BSS-Mike1> wow, thats LARGE cells :) maby something for you Ben :)
[14:58] <SA6BSS-Mike1> 4 of those will probably be fine
[14:59] <PE2BZ> 4 cells, at 10 km altitude, oversized, could give 3.4 - 3.6 V, no clouds, no layers between cells and the sun.
[14:59] <PE2BZ> SA6BSS-Mike1, I do have space enough ;-)
[14:59] <SA6BSS-Mike1> lol
[15:00] <PE2BZ> vincentsant, but, nice module, something I am able to get on a PCB :-)
[15:01] <PE2BZ> SA6BSS-Mike1, Should support APRS too ?
[15:02] <vincentsant> I see! so I replace the supercap by a standard 470uF, which should be rated over 6V anyway!
[15:03] <vincentsant> yes, LORA-E5 which is no more than STM32WLE5J8 looks promising! Has someone had experience with it already?
[15:04] <PE2BZ> No, ¨just¨ at328p with LoRa module(s) of different kinds, for LoRawan hab and rtty / lora radio amateur type, and about one week also APRS on 144.800
[15:04] <PE2BZ> Which side of this planet do you happen to live ?
[15:04] <vincentsant> France
[15:04] <PE2BZ> I am considering this....https://www.seeedstudio.com/LoRa-E5-Dev-Kit-p-4868.html
[15:05] <PE2BZ> That´s close enough :-)
[15:05] <PE2BZ> I? from Holland, the west part, close Hook of Holland
[15:06] <vincentsant> nice, very close at global scale!
[15:06] <PE2BZ> And you can send your payloads to Mike by HAB :-)
[15:06] <vincentsant> I have this one in the checkout: https://www.seeedstudio.com/LoRa-E5-mini-STM32WLE5JC-p-4869.html
[15:07] <vincentsant> My very last attempt (7 years ago) was with Lora with an at328p and RFM95.
[15:08] <vincentsant> STM32WLE5J8 looks amazing but there will be some learning curve
[15:08] <PE2BZ> That board looks ready to fly ! Add ATGM336H as GPS module, wait for you to finish the software ;-)
[15:09] <vincentsant> I'm been spending some time already understanding how to program it
[15:09] <vincentsant> GPS is in there already
[15:09] <vincentsant> MAX7Q I have in stock
[15:10] <PE2BZ> Those are good, but ATGM336h is pin compatible and required no flight mode so far. Flew up to 32 km with that
[15:11] <vincentsant> What about Quectel L70-M39?
[15:11] <vincentsant> Not as good but cheaper and can be soldered directly by seeeds...
[15:11] <PE2BZ> I guess SA6BSS-Mike1 has tested that one.
[15:13] <PE2BZ> https://www.dennisdeal.com/products/gp-02-gprs-series-gps-bds-compass-atgm336h-satellite-positioning-timing-module-gp02-iot_1507084?variant=17619753402458&gclid=Cj0KCQjwl_SHBhCQARIsAFIFRVUVZHAar2ljGfCU00OJoxnQiaBO6NGBHmWUZXbQGKU4pGwo5RiZlkQaAsoMEALw_wcB
[15:14] <PE2BZ> No chip or active antenna needed, 47 mm (1/4 wave) single (copper) wire directly to Antenna pin. 16 - 26 satellites during flight
[15:15] <PE2BZ> If the weight is not much of an issue (PiZero camera flights) I use this https://www.tinytronics.nl/shop/nl/communicatie-en-signalen/draadloos/gps/modules/atgm336h-gps-module
[15:16] <vincentsant> Nice, I did the single wire antenna with the MAX7C and got less sats. Weigth is an issue. I want it has small as possible. That's why I will switch to LORA-E5 so board gets divided by 2.
[15:17] <PE2BZ> Consider removing Q2, use the ATGM336H and drive the GPS standbye pin directly from PB10 ?
[15:18] <vincentsant> What is the current draw in standbye?
[15:19] <vincentsant> I have 10x MAX7Q so I need to use them ;-)
[15:20] <vincentsant> But I can use ATGM336H in next design. Do you know if it can run @1.8V?
[15:20] <PE2BZ> <25 ma in normal operation
[15:20] <PE2BZ> Yes I know, it does not.
[15:21] <vincentsant> MAX7Q either ;(
[15:21] <SA6BSS-Mike1> vincentsant: L70-M39 good low power module, have not done any flights with it, needs flightmode
[15:21] <vincentsant> SA6BSS-Mike1 thanks.
[15:21] <SA6BSS-Mike1> gets about 15° solar startup with that module
[15:22] <SA6BSS-Mike1> 19-20 with atgm
[15:22] <vincentsant> Does it need an external MOSFET?
[15:22] <SA6BSS-Mike1> iirc you can torn it off by pull pin 5 low
[15:23] <PE2BZ> Standby current is not in the datasheet I have in front of me.
[15:24] <PE2BZ> But from my memory I recall dropping the wspr tracker current with 20 mA, so my guestimation would be < 5 mA
[15:25] <SA6BSS-Mike1> atgm is a 2,7-3,3v module
[15:25] <vincentsant> only MAX7C is 1.8V
[15:25] <SA6BSS-Mike1> ah, Ben got it
[15:25] <SA6BSS-Mike1> yep
[15:25] <SA6BSS-Mike1> even 1.6 :)
[15:25] <vincentsant> TT7 managed to have MAX7C/Q with an average consumption of 3mA without MOSFET: http://tt7hab.blogspot.com/2017/06/the-low-power-setup.html
[15:26] <vincentsant> only through software
[15:26] <SA6BSS-Mike1> you can send stb message to it
[15:26] <vincentsant> SA6BSS-Mike1, to atgm? or L70-M39?
[15:27] <SA6BSS-Mike1> atgm have 100% pin 5 pull low to turn it off
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[15:30] <SA6BSS-Mike1> L70M39 seems to have the option as well, pin 5 off
[15:32] <vincentsant> Ok, nice! I'll stick with MAX7Q for this version and them look at atgm & L70-M39 as alternatives.
[15:32] <SA6BSS-Mike1> problem is not avarege consumption, you have realy more power then you can use with solar cells, you just need it to be as low as possible at morning and evening to have it start earlier and run longer
[15:33] <vincentsant> Ok, now I understand your message regarding ° solar startup ;-)
[15:33] <SA6BSS-Mike1> :)
[15:33] <vincentsant> L70-M39 better than atgm in that regard then?
[15:33] <SA6BSS-Mike1> quite a bit yes
[15:33] <vincentsant> great to know, thks
[15:34] <SA6BSS-Mike1> but the atgm is well tested and vitually imposible to get to hang.
[15:34] <SA6BSS-Mike1> the M39 I dont know
[15:35] <vincentsant> ok, you tested solar angle from the ground?
[15:35] <SA6BSS-Mike1> yes
[15:35] <SA6BSS-Mike1> usually about the same at flight
[15:36] <daveake> Remember the balloon mode for the L70 as well as the UBlox
[15:37] <vincentsant> Yes, thks. I did not set that in the last flight but did not go over 12km so did not see it fail ;-) In the short term, do you think I should get rid of Q2 then?
[15:37] <vincentsant> From our discussion I understand it is not so usefull...
[15:38] <SA6BSS-Mike1> ublox runs to 12000 without flightmode M39 to 10000
[15:38] <SA6BSS-Mike1> delay(2500); Serial.write("$PMTK886,3*2B\r\n"); //L70 Sets balloon mode for GPS module
[15:38] <SA6BSS-Mike1> to put it inot flight mode
[15:39] <daveake> I've not used the L70, but I have used the L80 which has the same command
[15:40] <vincentsant> does it work well with simple wire antenna? instead of chip?
[15:40] <SA6BSS-Mike1> ofc
[15:41] <SA6BSS-Mike1> all gps modules i have tried does
[15:41] <vincentsant> good to know
[15:41] <LeoBodnar> anybody knows why TT7 passed away?
[15:42] <SA6BSS-Mike1> Dont know really,illness, accident? he was not very old
[15:42] <SA6BSS-Mike1> early 20th
[15:42] <vincentsant> no, but amazing experiments
[15:43] <SA6BSS-Mike1> yes, his page is really good resource
[15:43] <vincentsant> do you pre expand the balloon like he did?
[15:44] <SA6BSS-Mike1> most people do if they send up floaters
[15:46] <SA6BSS-Mike1> get a manometer if you going for it
[15:47] <LeoBodnar> I used blood pressure monitor for last stage of inflation
[15:47] <SA6BSS-Mike1> I use a 50cm watercolumn and a digital manometer, much simpler
[15:48] <SA6BSS-Mike1> LeoBodnar: dont you feel an urge to get back into Habing and send of a floter, gone many years now since last :)
[15:48] <LeoBodnar> doing it right now actually
[15:48] <SA6BSS-Mike1> oh, cool!!
[15:48] <LeoBodnar> with a bit more thought
[15:48] <LeoBodnar> testing things at -55C etc
[15:49] <SA6BSS-Mike1> well, you kind of pioneered the whole hab floating 👍
[15:49] <LeoBodnar> found that there are no barometric sensors that work at -60C and 10kPa
[15:49] <SA6BSS-Mike1> .
[15:49] <LeoBodnar> habitat now is like a motorway :D
[15:49] <vincentsant> how to you get down to -55C?
[15:49] <SA6BSS-Mike1> yeah, lots of balloon :)
[15:50] <LeoBodnar> I have a chest freezer that goes down to -40C and I put a 12V car coolbox inside it
[15:50] <SA6BSS-Mike1> ha!
[15:51] <SA6BSS-Mike1> that I must make a mental note of :)
[15:51] <LeoBodnar> was going to have a look at the compressor in the freezer, I'd like to reach -60C
[15:51] <vincentsant> Amazing all this tricks! You got me into it 6 years ago ;-)
[15:51] <LeoBodnar> heh
[15:51] <SA6BSS-Mike1> me to, all your fault, lol
[15:51] <LeoBodnar> found that my GPS 0.5ppm TCXO falls off the cliff after -45C
[15:51] <LeoBodnar> and goes like 10ppm in 5C
[15:52] <LeoBodnar> basically, power consumption of the tracker is down to two things: good GPS antenna, stable GPS TCXO
[15:53] <LeoBodnar> if you don't run on solar only, if course
[15:53] <LeoBodnar> I'd like to run a full night shift at -60C, reliably
[15:54] <LeoBodnar> with 10-20min GPS updates
[15:54] <SA6BSS-Mike1> I belive all does, only one that accaunaly tries batteryes is Dave Ve3kcl
[15:54] <SA6BSS-Mike1> but raerly
[15:55] <SA6BSS-Mike1> his 13 flight only solar cells have now flown since last October on a pair of Cheap Chona balloons
[15:55] <SA6BSS-Mike1> *China
[15:55] <SA6BSS-Mike1> 17+ laps?? irc
[15:55] <LeoBodnar> I used LiPos overnight but Ublox tends to wake up, download tonnes of ephemerides, try and fail to get acquisition and kills it
[15:55] <SA6BSS-Mike1> ok
[15:56] <LeoBodnar> I now shut it off if it does not come back with a lock in 2 minutes
[15:56] <LeoBodnar> it's work in progress still
[15:57] <SA6BSS-Mike1> there are those small buttons SC cells that could hold backup
[15:57] <SA6BSS-Mike1> but with a battery you dont need that...
[15:57] <LeoBodnar> I am trying hybrid supercaps but even cold ones only work well down to -25C
[15:58] <LeoBodnar> so you have to slow-charge double layer SC from a hybrid SC and then run GPS from that
[15:58] <LeoBodnar> ESR of hybrid SC increases from 0.1R at 20C to 10-20R below -30C
[15:59] <LeoBodnar> I have not decided between hybrid SC vs LiPos yet
[16:00] <vincentsant> ha ha ! Hard to ask some questions after all that good stuff. How do I look now with my SMD 470 uF condo? ;-)
[16:00] <LeoBodnar> the energy is there, it's just "frozen" and needs retrieving very slowly
[16:02] <LeoBodnar> running through the night is a bit of a whim
[16:03] <SA6BSS-Mike1> you have seen those I guess https://www.reichelt.com/de/en/smd-supercapacitor-0-07f-3-3v-500-h-ko-sm3r3703t01-p244469.html for backup to gps,
[16:03] <SA6BSS-Mike1> does the frozen battery give enough to keep the V-Back running?
[16:04] <LeoBodnar> GPS backup needs only about 300uA
[16:04] <SA6BSS-Mike1> I know its really low amp
[16:04] <LeoBodnar> why do you need it? it's useless beyond 2-3 hours (ephemerides lifespan)
[16:05] <SA6BSS-Mike1> Id figure if the battery went below 1,5V even at 300microA it could be an alterenative
[16:05] <LeoBodnar> Ublox uses backup for two things: maintaining backup RAM contents and running 32k crystal to know when to wake up if you are using on/off PSM mode
[16:06] <LeoBodnar> if you just want to store some volatile data your MCU will probably need like 10uA in sleep
[16:06] <LeoBodnar> or FRAM or EEPROM are even less
[16:07] <SA6BSS-Mike1> the 32Khz crystal keeps the ephemeris as well, but al good then
[16:07] <LeoBodnar> I reckoned I need about 50F at 3-4V to actually take GPS fixes overnight
[16:08] <LeoBodnar> ephemerides need downloading every 2 hours, they are really useless beyond that
[16:08] <vincentsant> Does someone has eagle lib for REG710xx? I will update the design with your reco now
[16:08] <SA6BSS-Mike1> aha 2h , rr on that
[16:10] <LeoBodnar> https://geodesy.noaa.gov/web/science_edu/presentations_library/files/stressler_igs_poster_2018_final.pdf https://usercontent.irccloud-cdn.com/file/bQCNGASB/image.png
[16:10] <SA6BSS-Mike1> https://www.snapeda.com/search/?q=REG710&search-type=parts
[16:10] <LeoBodnar> Glonass is even worse, 30 min
[16:11] <vincentsant> Thks
[16:13] <SA6BSS-Mike1> rr, I just skimmed though those datas as Im only runing pure solar so never cared to memorize them :)
[16:15] <SA6BSS-Mike1> Dave ve3kcl made some cold tests on some gps modules, lets seeif I i can find it
[16:17] <SA6BSS-Mike1> can you open this https://www.dropbox.com/s/26r15flczhi0m8m/gps%20cold%20testing.png?dl=0
[16:26] <LeoBodnar> yeah, thanks
[16:27] <SA6BSS-Mike1> 👌
[16:27] <LeoBodnar> I use bare M8030 Ublox ICs with own TCXO and 32K crystal so have only myself to blame for any part problems
[16:28] <LeoBodnar> it's possible that crystal-based design like MAX-M8C is better than TCXO because it does not run away that quickly outside of its compensation range
[16:29] <SA6BSS-Mike1> been thinking of that as well to skip the module and just solder the main ublox ic and it´s tcxo
[16:29] <LeoBodnar> all my floaters apart from one or two used MAX-M8C and MAX-7C
[16:30] <LeoBodnar> mostly MAX-7C, which use regular crystal, not TCXO
[16:30] <SA6BSS-Mike1> I assume you have turned off all nav systems but GPS to save some mA
[16:31] <LeoBodnar> yeah GPS is ~19mA and GPS+GLONASS is ~22mA on 3Vdd
[16:31] <SA6BSS-Mike1> yeah
[16:31] <LeoBodnar> it's not that bad for GPS+Galileo since they are using only one RF section (M8 has two)
[16:32] <LeoBodnar> but Galileo is a joke atm
[16:33] <LeoBodnar> it's not clear cut because if antenna is not very good or you have local jamming source in the tracker you often get quicker lock with GPS+Glonass
[16:33] <LeoBodnar> so overall energy saving is very hard to judge. Experiment!
[16:34] <SA6BSS-Mike1> I know yo3ict had a routine to turn off all but GPS under 20° solar but over that solar angle all avalible nav system was online
[16:35] <SA6BSS-Mike1> yes, every flight must contain at least something new :) its all a long series of experiment
[16:36] <LeoBodnar> atm I went back to pure GPS for now
[16:37] <LeoBodnar> at low temp absolute current value is more important then the acquisition length - because of high battery ESR
[16:41] <SA6BSS-Mike1> ok
[16:42] <LeoBodnar> my biggest "problem" is trying to find a lightweight pressure sensor that just works at -60C or so
[16:43] <LeoBodnar> almost all of them are quoting absolute max -40C even for storage
[16:43] <SA6BSS-Mike1> ok, cant help you there
[16:43] <SA6BSS-Mike1> rr
[16:43] <SpacenearUS> New position from 03KD2FOU-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2FOU-11
[16:43] <SA6BSS-Mike1> my BSS-38 just called in on 20m wspr,
[16:44] <SA6BSS-Mike1> its a bit early but I dont complain :)
[16:45] <SA6BSS-Mike1> below 15° besy so far on this flight :)
[16:46] <LeoBodnar> I have found that MS5611 goes mental below -45C then I have noticed that TT7 used its brother MS5607 and noticed that it just stops responding
[16:46] <LeoBodnar> well done SA6BSS-Mike1 !
[16:46] <SA6BSS-Mike1> :)
[16:50] <PE2BZ> Come on guys, I only was away for 1.5 hours ;-) Had a lot of reading to catch up :-)
[16:55] <SA6BSS-Mike1> are you done Ben so we can continue :)
[16:55] <PE2BZ> Finished pancakes, yes :-)
[16:55] <PE2BZ> I did not want to blame LeoBodnar for getting me into building trackers too, but ....
[16:55] <SA6BSS-Mike1> haha
[16:56] <LeoBodnar> haha
[16:56] <LeoBodnar> I'm humbled :)
[16:57] <LeoBodnar> Ublox claims M10 series is 75% more energy efficient but I am suspicious still
[16:57] <PE2BZ> Still have the images of your payload with one Energizer battery ready to go up again. If the mountains between France and Spain would have been a tiny bit lower :-)
[16:58] <LeoBodnar> yeah it was an awesome re-launch
[16:58] <PE2BZ> But in the mean time I am struggling to get my 2m / 70 cm openwebrx up again. I did all updates to Ubuntu version, but on the wrong machine IP address....
[17:08] <vincentsant> Hey guys, back to your suggestions of using REG710 and replacing the supercap with a 470uF cap, I am still not sure if it will stand the lora radio TX which can last max 350ms (on SF10) but draws 107mA at 22dB. Would that work?
[17:08] <SA6BSS-Mike1> oh, thats a lot of mA s
[17:08] <vincentsant> REG710 only outputs 30mA
[17:09] <vincentsant> so the cap must provide the rest
[17:09] <SA6BSS-Mike1> you can try the 4002, there is ready built module to get
[17:10] <SA6BSS-Mike1> https://www.aliexpress.com/item/32718499724.html?spm=a2g0o.productlist.0.0.34f8147dRXGsR8&algo_pvid=62199450-6769-405b-bf82-e5df14f3eec7&algo_exp_id=62199450-6769-405b-bf82-e5df14f3eec7-0
[17:10] <PE2BZ> From my head the 4002b limits at 130 mA, so that would require a cap on the output too. On the other hand, who needs 22 dBm at 1000m+ altitude ? 10 dBm should be enough ?
[17:11] <SA6BSS-Mike1> or just use 6 smaller cells 52x19 / 39x19
[17:11] <SA6BSS-Mike1> and skip all boosts
[17:13] <vincentsant> so only 3.3 LDO? without any condo?
[17:14] <SpacenearUS> New position from 03BSS38 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS38
[17:15] <SA6BSS-Mike1> yes
[17:15] <vincentsant> 14 dBm draws 26mA so that should work as well.
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[17:17] <SA6BSS-Mike1> on my aprs flights I use 10-13dbm , good covarege
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[17:17] <SA6BSS-Mike1> usually to los
[17:18] Nick change: SA6BSS-Mike1 -> SA6BSS-Mike
[17:18] <PE2BZ> Mike1 = Mike1 minus 1 ;-)
[17:19] <SA6BSS-Mike> let me formulate that ;)
[17:22] <SpacenearUS> New position from 03W8VPV-1 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W8VPV-1
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[17:47] <SpacenearUS> New position from 03NOB8 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB8
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[19:33] <SpacenearUS> New position from 03TA2MUN-15 after 036 hours silence - 12https://tracker.habhub.org/#!qm=All&q=TA2MUN-15
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[23:19] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
[00:00] --- Mon Jul 26 2021