highaltitude.log.20190210

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[00:08] <SpacenearUS> New vehicle on the map: 03VK5ST_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5ST_chase
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[00:54] <Darkside> purewhite[m]: over here!
[00:54] <Darkside> purewhite[m]: the reason behind a 1/4 wavelength is that the antenna is 'matched' to the coaxial cable you use to feed it
[00:55] <Darkside> ideally, a 1/4 wavelength element over a correctly angled set of ground radials will have an RF input impedance of ~50 ohms at the frequency it is cut for
[00:56] <purewhite[m]> Cool. I saw the pictures in the presentation, and when googling, so I guess it's time to build my own antenna
[00:56] <Darkside> it is also possible to buy one :P
[00:56] <Darkside> or something similar anyway
[00:57] <purewhite[m]> Hmmmm. I may need to search then
[00:57] <TimMc_> Does rx_power and rx_fm swap in nicely for autorx?
[00:57] <Darkside> nope
[00:57] <purewhite[m]> I've worked with RG6 (iirc) coax in a previous job. So might try making one first
[00:57] <TimMc_> I've an rsp1a handy and my 2nd rtlsdr v3 isn't performing well
[00:57] <Darkside> rx_power and rx_fm are buggy as hell
[00:59] <Darkside> TimMc_: i'm looking into a replacement for rtl_fm at the moment, but rtl_power is going to be a harder one to replace
[01:00] <superkuh> You can also try https://github.com/polygon/sdr-power but I'm not sure it supports what you use sinec I don't know what you use.
[01:00] <superkuh> I think just the hackrf and rtlsdr.
[01:00] <Darkside> looks like that only supports rtlsdr, hackrd and bladerf
[01:02] <Darkside> generating the data needed isnt that hard - we just need to buffer up a few seconds of samples and run an FFT over them
[01:04] <Darkside> (or be smarter and do shorter FFTs and average them)
[01:05] <Darkside> the signal processing is not particularly hard, its being able to do it in a cross-platform and cross-device way thats more of a pain
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[04:35] <TimMc_> two radiosondes in Buxton :O
[04:40] <Darkside> the first melb launch had a failed temp sensor
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[05:27] Nick change: day_ -> day
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[06:50] <TimMc_> Vaisala said I should dispose of the radiosondes ^_^
[06:57] <Darkside> TimMc_: how do you mean? you contacted them?
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[07:35] <TimMc_> They commented on Twitter with a generic reply @ #radiosonde
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[07:51] <Darkside> lol
[07:51] <Darkside> link?
[07:52] <purewhite[m]> Check out @VaisalaGroups Tweet: https://twitter.com/VaisalaGroup/status/1093769221572562945?s=09
[07:53] <Darkside> lol
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[07:58] <purewhite[m]> It looks very generic
[07:59] <purewhite[m]> Maybe they get people trying to send it back to them
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[08:08] <SA6BSS-Mike|2> we have a similar sticker on ours sondes as well
[08:09] Nick change: SA6BSS-Mike|2 -> SA6BSS-Mike
[08:53] <Lahti> Vaisala's own test sonde sticker again https://aijaa.com/OlIynf
[09:12] <Lahti> When sent by the Meteorological Institute, the sticker circulates around the sonde https://aijaa.com/ypXGy1 https://aijaa.com/MUP9x0 https://aijaa.com/lZOsRF https://aijaa.com/1EhjH8
[09:14] <Lahti> There are no labels at all sent by the Finnish Defense Forces
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[09:55] <yo3ict_> Guys, the Varta Lithium are any good?
[09:56] <yo3ict_> As replacement for the Energizer
[10:00] <Darkside> if they are not lithium iron disulfide chemistry then i wouldnt use the
[10:00] <Darkside> them*
[10:00] <craag> yo3ict_: The 1.5v lithiums appear to be Li/FeS2, same as energizer.
[10:01] <craag> https://www.batterystation.co.uk/fileuploader/download/download/?d=0&file=custom%2Fupload%2FFile-1468584126.pdf
[10:01] <Darkside> test them on a throwaway flight first :-)
[10:01] <craag> Not as much juicy technical info as the energizers, so yes what Darkside said :)
[10:03] <yo3ict_> https://www.varta-consumer.com/Static/prisma/varta/images/s3/06103301404_16455_20180501.png
[10:03] <yo3ict_> This one.
[10:05] <craag> varta product page says "Withstands extremely low temperatures"
[10:05] <craag> so yes looks likely, but none of us are going to say they're equivalent to energizers until they've done at least 50 test flights ;)
[10:05] <Darkside> withstands != can supply the same current as at room temp
[10:06] <craag> indeed. energizer has nice graphs of that, varta notably does not.
[10:09] <SpacenearUS> New position from 03SP9UOB after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB
[10:10] <SpacenearUS> New position from 03SP9UOB-P32 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB-P32
[10:22] <SpeedEvil> If your flight is a couple hours, and you've got a pi onboard, it's probably not so much of an issue.
[10:22] <SpeedEvil> If you are doing milliwatts and days, it matters more.
[10:23] <bertrik> because of the heat that the pi produces?
[10:24] <Darkside> yup
[10:24] <Darkside> also the heat dissipated in the battery from its internal resistance
[10:25] <SpeedEvil> And though it does get (much) colder as you go up, losses from convection drop too.
[10:25] <SpeedEvil> At moderate powers anyway
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[10:28] <bertrik> there was quite an extraordinary event yesterday in the netherlands, a truck was venting some smelly chemical and people could smell it at > 100 km away
[10:35] <SpikeUK> Any admins for https://ukhas.org.uk/ website hereabouts please?
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[10:56] <Viproz> Darkside, Yay for M10s in master ! We should probably get many more M10s on the map as people update, I've seen someone in France use the testing branch already, I'll try to get more people to using it (I discovered that we already have a private and closed source network of decoders that decode just one frequency, I'll try to get people to switch to the more user friendly version)
[10:56] <Darkside> heh
[10:56] <Darkside> yeah there appear to be a few of these closed networks around
[10:58] <Darkside> bit of a shame really
[10:58] <Darkside> but hopefully we can move people away from that and onto something open!
[10:59] <Viproz> btw I don't think I've posted what cmd line I'm using to get the better audio but here it is https://gist.github.com/Viproz/2af683c9c855e954321253a79d73bf95, working well so far (not saying we should use it for real, the only viable solution with this would be a config option but config options are annoying it makes it harder and more confusing to setup while adding complexity)
[11:00] <Viproz> Yeah I'm not sure the philosophy of OM in France is always the best, opensource for something likes this makes a lot more sense
[11:02] <Darkside> im in discussions with teh author of nanorx...
[11:02] <Darkside> and he's definitely going to release it
[11:02] <Darkside> currently the fm demods in it have some de-emphs stuff that wont help with sonde decoding
[11:03] <Viproz> nice, does he have a NET date though ?
[11:03] <Darkside> 'imminently'
[11:03] <Darkside> of course it means something else the users have to git clone and build
[11:04] <Darkside> im sure it wont make it into any package manages for a while
[11:04] <Viproz> a Not Earlier Than now date is nice :D
[11:05] <Viproz> Maybe we should do a script installing everything into a subfolder, no need to do a make install if we link it correctly
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[11:06] <dbrooke> talking of open source I had another play with horusbinary decoder, having reflashed an RS41 so I could test 4FSK, and it does also decode my own RTTY payload via UDP from gqrx so I don't know why it failed back in November
[11:07] <dbrooke> also been playing with some of the other horus stuff, which looks good
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[11:15] <SpacenearUS> New position from 03PEPER-1 after 037 days silence - 12https://tracker.habhub.org/#!qm=All&q=PEPER-1
[11:18] <Darkside> dbrooke: oh cool
[11:19] <Darkside> dbrooke: what have you been playing with?
[11:21] <dbrooke> chasemapper mainly, but fldigi bridge also, though it doesn't parse my payload
[11:21] <Darkside> oh
[11:22] <Darkside> any idea whyt?
[11:22] <dbrooke> yes, I send lat/lon in nmea format, not float
[11:23] <dbrooke> so not your problem 8-)
[11:23] <Darkside> ahh
[11:23] <Darkside> good :-)
[11:24] <dbrooke> now I've got the RS41 running I can test against the RTTY from that at some point
[11:24] <Darkside> glad to hear chasemapper is being used
[11:24] <TimMc_> uh oh, temp fail again in Melbourne
[11:24] <dbrooke> I found a UDP splitter so can send to multiple apps simultaneously from gqrx
[11:26] <dbrooke> I'll definitely put chasemapper in the Land Rover, but the current PC in there is too ancient to run a modern Linux so will need to install a(nother) Pi
[11:26] <Darkside> Pi + tablet as a screen works well
[11:26] <Darkside> i have the pi in the boot, and use an ipad mini as a display for the web gui
[11:27] <dbrooke> until my tablet died that's pretty much what I used in the car, the LR has a screen mounted above the mirror
[11:29] <Darkside> definitel some things that need to be fixed in chasemapper, but its worked well for the last few horus flights
[11:29] <Darkside> and lots of sonde chases of course
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[11:29] <dbrooke> I've been feeding it with sonde data and testing the predictor
[11:30] <Darkside> the predictor is the same one that drives habhub, its just i genererally run it with the 0.25 degree , 1 hour time resolution data
[11:30] <Darkside> it makes a difference when you have weather changes occuring
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[11:31] <dbrooke> yes, so far I've just verified against habhub but it looks good
[11:33] <dbrooke> now I need to upgrade auto_rx and see if the M10s the detector finds are real 8-)
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[11:42] <PE2BZ> yo3ict I ran ONE freezer test with rs41 with Varta vs Energizer vs Jupio (you will notice that brand if you find yourself an RS41 in the mail...)
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[11:45] <PE2BZ> Varta and Energizer both where transmittin at -19 degrees after 24 hours and the Jupio had restarted twice during the same period. Jupio where local from the Netherlands, but on 2 trackers on the same flight (PITS and RS41 backup) there where never experienced restarts with those Jupio batteries.I guess the Varta´s are as good as energizer, but as Craag says you could use 49 more references to proof that.
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[11:57] <Elwell> evening all. anyone around with sondetracking knowledge just now? (just watched teh LCA video)
[11:58] <Elwell> tempted to try and get a feed from Tassie - not sure what the normal direction the hhobart ones drift off in, (I'm douwn south) but may still be able to pick em up as I've been pulling in plane ADSB recently OK
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[12:01] <purewhite[m]> Elwell: Darkside is good to talk to. I managed to track my first radiosonde this morning in Brisbane after watching the talk at LCA
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[12:05] <PE2BZ> ping bertrik do you have some time to help a lorawan noob ?
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[12:10] <Darkside> Elwell: hobart launch twice a day, 00 and 12Z
[12:11] <Darkside> doesnt hurt to set something up and see what you get
[12:13] <Elwell> are they always on the same freq?
[12:13] <Elwell> (ish)
[12:13] <Darkside> nope, hence the point of radiosonde_auto_rx
[12:14] <Elwell> cool. need moar rtl-sdr's
[12:14] <Darkside> that said, its likely it would be on either 400.5, 401.5, or 402.5 MHz
[12:15] <Darkside> however it can change from launch to launch
[12:17] <Darkside> but yeah, the idea behind autorx is that it will automatically scan for them, lock on, and upload
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[12:26] <Darkside> PE2BZ: so waht command are you running at the moment to produce that rtl_power output?
[12:28] <dbrooke> that reminds me I should download some more LCA talks, I didn't spot that you'd done one ...
[12:29] <Darkside> hackaday spotted it..
[12:42] <TimMc_> ooh today
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[12:46] <Elwell> oooh, I didn't realise that auto_rx could speak to rotctld. this could be the incentive to finish the rotator
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[13:00] <PE2BZ> Darkside rtl_power -d 0 -f 400M:406M:4k -g 42 -p 57 -i 30 -c 50% | python beagle_wasserfall.py 400000000 2345.75 2560 5
[13:01] <PE2BZ> the wasserfall.py takes care of the grahics, 400000000 is the start frequency
[13:05] <PE2BZ> then fft bin size, then logged fft bins and number of hops
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[13:21] <PE2BZ> ping bertrik I think I found what I was doing wrong, my device is being received by 2 gateways atm :-)
[13:23] <bertrik> oh sorry, didn't respond to your previous message
[13:23] <bertrik> PE2BZ: that's perfectly possible
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[13:25] <PE2BZ> bertrik lesson learned today: even the device address is better of with copy paste then with typing including my error :-(
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[14:16] <Lahti> fullhd https://tracker.sondehub.org/?sondehub=1#!mt=osm&mz=6&qm=All&mc=57.98524,27.4714&f=RS_K3323059&q=RS_K3323059
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[14:33] <Lahti> Oldtimer K, It has been probably launched from Riga, Latvia
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[15:15] <SpacenearUS> New vehicle on the map: 03KB1KVR - 12https://tracker.habhub.org/#!qm=All&q=KB1KVR
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[16:25] <PE0SAT> .c
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[18:16] <SpacenearUS> New vehicle on the map: 03KI6VBK-11 - 12https://tracker.habhub.org/#!qm=All&q=KI6VBK-11
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[19:39] <SpacenearUS> New vehicle on the map: 03LU1ESY-3 - 12https://tracker.habhub.org/#!qm=All&q=LU1ESY-3
[19:49] <SpacenearUS> New vehicle on the map: 03LU1ESY-5 - 12https://tracker.habhub.org/#!qm=All&q=LU1ESY-5
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[23:25] <mwheeler> TimMc_: ozonesonde launch at ~11:30 on Wednesday, I'm gonna go watch / film the launch :)
[23:26] <TimMc_> :o
[23:26] <mwheeler> predication has it landing in forrest around marrysville so might not chase it unless that changes
[23:26] <TimMc_> mwheeler: going to Broadmeadows?
[23:27] <mwheeler> yup
[23:28] <mwheeler> TimMc_: oh btw, how did @VaisalaGroup even find your tweet lol
[23:29] <TimMc_> mwheeler: a friend kept asking about the radiosonde and i had cc'd* Vaisala lol
[23:29] <mwheeler> ah
[23:31] <TimMc_> LNA4ALL any good?
[23:32] <mwheeler> yeah. I've got that on my receiving station at the moment. Antenna is mounted in a poor place at the moment, so can't test it out well
[23:35] <TimMc_> I'll try to split one antenna for multiple rtlsdr :P
[23:35] <TimMc_> Found some cheap sma patch leads on ebay
[23:43] <Elwell> without me needing to construct another highly tuned and optimised antenna (ahem,
[23:43] <Elwell> https://twitter.com/elwell2000/status/1090029746497282049) am I likely to get anything of a 69mm antenna for 400(ish) MHz?
[23:48] <mwheeler> hehe
[23:48] <mwheeler> Elwell: that looks a little too short, but probably still fine
[23:50] <Elwell> it's also just into an el-cheapo DVB-T stick so not sure how stable it'll be (shed temp varies wildly as roof uninsulated - http://weather.two-fifteen.com/monthinside.png
[00:00] --- Mon Feb 11 2019