highaltitude.log.20210729

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[07:51] <SpacenearUS> New position from 03SQ6NEI-4FSK after 039 days silence - 12https://tracker.habhub.org/#!qm=All&q=SQ6NEI-4FSK
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[08:51] <alistair> Is anyone here involved with the landing predictor? I dont think it has updated in the last day, and predictions are being run against the model 2021072806 dataset.
[08:52] <daveake> Yeah looks like it's not updated since then ... my hourly has the same model
[08:52] <daveake> The admin guys are in #habhub you can join there and mention it or I'll do that
[08:53] vincentsan (~vincentsa@212-198-230-5.rev.numericable.fr) joined #highaltitude.
[08:54] <vincentsan> PE2BZ, SA6BSS-Mike1, final design sent to the fab: http://www.up-in-the-air.com.s3-website-eu-west-1.amazonaws.com/designs/Up4r3.pdf
[08:55] <vincentsan> I will now work on a revision with a step-up so it can work with just 2 solar cells in series. Do you have any reference in mind?
[08:59] <vincentsan> XC9141/2 seems promising (only 2 caps and 1 2.2¼H inductance for the D version) but there are a lot of different flavors A, B, C, D, E types that I don't really understand...
[09:05] <SpacenearUS> New position from 03KD2FOU-11 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2FOU-11
[09:07] <PE2BZ> vincentsan, last time I tried 2 cells to 3v3 stepup it required an inductor for 150 mA current and the models I could find where as heavy as 4 solar cells.
[09:10] <PE2BZ> daveake, alistair , I am on the habhub channel, Mark finds out there is some overload protection active for to much requests on that noaa server.
[09:11] <alistair> daveake Thanks. How frustrating. I am subscribed now and will keep an eye on progress.
[09:12] <SpacenearUS> New position from 03SQ6NEI-12 after 0313 days silence - 12https://tracker.habhub.org/#!qm=All&q=SQ6NEI-12
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[09:22] <vincentsan> PE2BZ, the recommended inductance for XC9141/2 are 5x5mm or 4x4mm and weight ~0.2g. It is still much better than 1.6g for 4 solar cells, no?
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[09:38] <PE2BZ> vincentsan, yes, but if you need 100 mA at 3V for example, with 100 efficiency, you would require 300 mA at 1 V so for me I always ran into that kind of problems.
[09:43] <vincentsan> well, as you said earlier, I don't think I need more than 14 dBm for a HAB. Lora-E5 will draw 26mA for 14 dBm and GPS about the same but they won't work at the same time. So I think if I can get around 30mA at 3V, I will be fine with this set up.
[09:45] <vincentsan> reg710 gives 30mA and I found reg711 that gives 50mA but they still require 4 cells. I think I could go down to only 2 in this revision if I find the good IC.
[10:37] <SA6BSS-Mike1> yes, dont bother with 2 cells
[10:38] <SA6BSS-Mike1> its will just be as heavy as 4/6 cells with the needed supercap
[10:38] <SA6BSS-Mike1> and you are back to the 1040
[10:38] <SA6BSS-Mike1> if you going with 2 cells setup
[10:39] <SA6BSS-Mike1> any inductor based boost ic like mcp1640 will peek at 200-300mA before it start conducting
[10:44] <vincentsan> ok so you are saying inductor based boost ic will not work?
[10:44] <SA6BSS-Mike1> with very large cells and high solar
[10:44] <SA6BSS-Mike1> angle
[10:45] <SA6BSS-Mike1> so best simplicety just 4 of teh smallest cells 39x19 and a reg710 or hx4002 you will get a good compromise imho that is :)
[10:45] <vincentsan> ok, that makes sense. thank you!
[10:46] <vincentsan> would reg711 give a little more juice just in case?
[10:46] <SA6BSS-Mike1> cant say
[10:47] <vincentsan> looks like the reg710 but with 50mA instead of 30mA: https://www.ti.com/lit/ds/symlink/reg711-25.pdf?ts=1627490534044&ref_url=https%253A%252F%252Fwww.google.com%252F
[10:48] <SA6BSS-Mike1> really cant say
[10:48] <vincentsan> ok, i'll stick with what has been tested then ;-)
[10:49] <SA6BSS-Mike1> for example YO3ict used the reg710 with a ubblox max 8 , he got at best 12-13 solara startup angle
[10:50] <vincentsan> sounds good to me!
[10:50] <SA6BSS-Mike1> I never tried the max8 but with L70m39 I get about the same nr, but with a atgm336 I get ca 19L
[10:50] <SA6BSS-Mike1> °
[10:51] <SA6BSS-Mike1> I slowly increase tx power
[10:51] <SA6BSS-Mike1> in first 10 min I let it tx with 4mW then I increase the power one step every 10 min
[10:51] <vincentsan> :+1
[10:52] <SA6BSS-Mike1> so I have max power 13mW after 30
[10:52] <SA6BSS-Mike1> min
[10:52] <SA6BSS-Mike1> so, mainly its the gps that determines the startup, not the tx
[10:53] <vincentsan> ok, I don't even think I need 14dBm at the end. I've read a few posts about Lora attached to balloons and it seems well received by (too) many gateways
[10:53] <SA6BSS-Mike1> so that could improve with the 711 but only one way to know... :)(
[10:53] <SA6BSS-Mike1> :)
[10:54] <SA6BSS-Mike1> using lora or are you doing aprs with it?
[10:54] <vincentsan> lora
[10:54] <SA6BSS-Mike1> ok
[10:54] <vincentsan> not sure aprs is supported by LORA-E5 but maybe
[10:54] <vincentsan> PE2BZ will experiment with that I think
[10:54] <SA6BSS-Mike1> what is the main ic?
[10:54] <SA6BSS-Mike1> sx1278?
[10:55] <PE2BZ> Yes and yes
[10:55] <SA6BSS-Mike1> then it does , the 95/96 modules I dont know
[10:55] <vincentsan> STM32WLE5J8
[10:55] <PE2BZ> Mentioned SX127X in the specs
[10:55] <SA6BSS-Mike1> slow vnc...
[10:56] <PE2BZ> But if the board arrives I first have to get a clue about the difference between STM and 328p programming ;-)
[10:56] <vincentsan> Me too
[10:56] <vincentsan> I have ordered a ST-LINK v3 as well to experiment
[10:57] <SA6BSS-Mike1> ,any of the stm ics you can connect a usb directly to , no need for serial converter or isp programming
[10:57] <vincentsan> BTW, do you have a good PCB fab to recommend in Europe? I have ordered from OSHpark but I am afraid it will cost a lot more now with custom + new VAT since 1st of July...
[10:57] <SA6BSS-Mike1> the rs41 is stm
[10:57] <SA6BSS-Mike1> using jlcpsc in china
[10:58] <vincentsan> do you have to pay custom + VAT?
[10:59] <SA6BSS-Mike1> not to this day
[10:59] <vincentsan> where do you live btw?
[10:59] <SA6BSS-Mike1> Sweden
[10:59] <vincentsan> have you received something since the 1st of July?
[11:00] <SA6BSS-Mike1> we have had customs and vat + handeling fee since 2018
[11:00] <SA6BSS-Mike1> but somehow they passed that
[11:00] <vincentsan> I guess they are sending it as personal mail
[11:00] <SA6BSS-Mike1> it looked like they where shiped from Gibraltar
[11:00] <vincentsan> hum, interesting
[11:01] <SA6BSS-Mike1> yeah, straight to them mailbox
[11:01] <SA6BSS-Mike1> lunchbreak over, back to work
[11:01] <vincentsan> PE2BZ, we'll see what will happen with seeedstudio orders... Never paid custom in the past but with this new law...
[11:02] <vincentsan> SA6BSS-Mike1, thks for the tips!
[11:02] <dbrooke> https://support.jlcpcb.com/article/89-customs-duties-and-taxes
[11:03] <vincentsan> Great! if they collect VAT, their should be no pb. Thks for sharing.
[11:04] <dbrooke> I'm in UK and have an order in production at the moment so will see in a week or so but hopefully no extra charges
[11:04] <LIERO> I always have to pay VAT for jlcpcb orders
[11:05] <LIERO> but I've given permission to DHL to represent me to customs, so it's only a few clicks
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[11:12] <vincentsan> I'm fine with paying VAT, but in France it will be a fixed fee if not dealt with by the seller + I guess it will probably trigger customs more often which handling fee (25-30¬) is pricey for a few PCBs...
[11:14] <PE2BZ> vincentsan, mine comes with DHL, so I am sure I have to pay some additional fees....
[11:15] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[11:45] <SpacenearUS> New position from 03EVA1 after 0320 hours silence - 12https://tracker.habhub.org/#!qm=All&q=EVA1
[11:52] <SpacenearUS> New position from 03W8VPV-1 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W8VPV-1
[12:16] <SpacenearUS> New position from 03NOB8 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=NOB8
[12:17] <PE2BZ> VK5QI, on sondehub there is a receiver LAUHPS uploading with what appears to be only seconds between the uploads ?
[12:17] <PE2BZ> https://tracker.sondehub.org/#!mt=Mapnik&mz=10&qm=1h&mc=52.32988,6.55609&f=R3751186
[12:19] <PE2BZ> auto_rx-1.5.4-beta2
[12:25] <happysat> User is notified
[12:26] <PE2BZ> Thank !
[12:26] <happysat> Laurens..
[12:26] <PE2BZ> Fam van Timm?
[12:26] <happysat> Zeker&vast :d
[12:31] <Rebounder> hi guys!
[12:31] <PE2BZ> Hi :-)
[12:34] <Rebounder> mm, the E5 is rf-chip + cpu combined?
[12:34] <PE2BZ> Yes indeed.
[12:35] <Rebounder> darn, cheap stuff
[12:35] <PE2BZ> Did not know till vincentsan came only to tell about it :-)
[12:35] <PE2BZ> I have 2 of the small development board on their way.
[12:36] <Rebounder> i have 2 ttgo-loraboards in "transit" since beginning of june
[12:38] <PE2BZ> The Evergiven has arrived in Rotterdam :-)
[12:39] <PE2BZ> ttgo for RS41 decoder, satellite groundstation for Norby or completely different purpose ?
[12:40] <Rebounder> according to my tracking all my stuff is somewhere between PostNL
[12:41] <Rebounder> & PostNord (sweden)
[12:41] <Rebounder> o well. it's for tracking ttn/aprs-lora etc
[12:41] <PE2BZ> So you are a ¨local¨ in NL ?
[12:41] <Rebounder> nope. Stockholm
[12:42] <PE2BZ> Sorry ;-) just wanted to blame SA6BSS-Mike1 for stealing our hardware ;-) I am in NL
[12:44] <Rebounder> hehe
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[12:52] <PE2BZ> Appears Nauka will dock to ISS ?
[12:52] <PE2BZ> https://www.youtube.com/watch?v=mDr6p-DlrTs
[12:53] <PE2BZ> Should happen in about 40 minutes
[12:54] <Rebounder> for those not fluent i russian, https://www.youtube.com/watch?v=21X5lGlDOfg
[12:57] <PE2BZ> I am playing qmusic :-)
[12:57] <PE2BZ> No youtube audio when decoding RS41 from my websdr
[13:02] <SpacenearUS> New position from 03N4KGL-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4KGL-11
[13:34] <Rebounder> went fine it seems
[13:35] <PE2BZ> I´m glad that I was not holding the controller :-)
[13:44] <Rebounder> the best quote from the translator, "the manual controls are not responding. don't worry"
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[14:17] <Rebounder> pretty nice combo, https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html
[14:23] <vincentsan> yes, and this is well packaged by seeds in LORA-E5: https://www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html.
[14:23] <vincentsan> Just ordered 10 ;-)
[14:25] <SpacenearUS> New vehicle on the map: 03KD0ZTV-5 - 12https://tracker.habhub.org/#!qm=All&q=KD0ZTV-5
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[17:24] <SpacenearUS> New position from 03BSS38 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS38
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[23:13] <SpacenearUS> New position from 03N4XWC-1 after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[23:30] <SpacenearUS> New vehicle on the map: 03PC4L-4FSK - 12https://tracker.habhub.org/#!qm=All&q=PC4L-4FSK
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[23:41] <SpacenearUS> New vehicle on the map: 03PU4LSB-11 - 12https://tracker.habhub.org/#!qm=All&q=PU4LSB-11
[00:00] --- Fri Jul 30 2021