highaltitude.log.20171229

[00:02] <Darkside> fsphil: it seems ok
[00:03] <Darkside> so i have had some success in the past using codec2's fsk_demod
[00:03] <Darkside> ill try and find the command line i used to do it
[00:03] <Darkside> it was a pretty big hack
[00:03] <fsphil> worth a try
[00:03] <fsphil> I'm not sure why this is so weak
[00:03] <fsphil> could just be the rtlsdr is a bit crap
[00:03] <Darkside> fsk_demod outputs 'one-bit-per-byte'
[00:03] <Darkside> i.e. 0x00 or 0x01
[00:03] <fsphil> or there's too much out of band noise
[00:04] <Darkside> so i write a script to read that in and convert it to a 'perfect' FM-demodulated FSK signal, for input into ths RS decoders
[00:05] <Darkside> ill try and find it again..
[00:05] <fsphil> I'll put a 70cm/2m diplexer in tomorrow, in reverse so just the high band goes to the rtlsdr
[00:05] <fsphil> that should cut out the broadcast band
[00:07] <Darkside> nc -l -u localhost 7355 | ./fsk_demod -t 2 48000 4800 - - 2> >(python fskdemodgui.py --wide) | python bits_to_samples.py | sox -t raw -r 48k -e s -b 8 -c 1 - -r 48000 -b 8 -t wav - | ../rs41mod
[00:07] <Darkside> ahh
[00:07] <Darkside> looks like i was using GQRX as the USB demod
[00:08] <Darkside> need to find a command line demodulator which can do the same - that is, 48 kHz sample rate, ~20 khz bandwidth SSB demod
[00:15] <mwheeler> Darkside: is YMMLSONDE2 payload been updated with the changes?
[00:35] <Darkside> mwheeler: ahh nope
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[00:36] <mwheeler> not to worry, doesn't look like there is a second sonde launch today anyway
[00:36] <Darkside> fixed
[00:36] <Darkside> ok
[00:36] <mwheeler> thanks
[00:40] <Darkside> hmm
[00:40] <Darkside> i suspect the descent rate i'm using for that mt gambier prediction might not be right
[00:40] <Darkside> pretty sure the auto-sonde launchers have a plastic parachute within the balloon
[00:40] <SpacenearUS> New vehicle on the map: 03YMMLSONDE2 - 12https://tracker.habhub.org/#!qm=All&q=YMMLSONDE2
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[00:41] <mwheeler> whoops
[00:41] <Darkside> lol
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[00:43] <Darkside> hrm, so yeah, might have a look at developing an alternate receive chain
[00:43] <Darkside> first step is to figure out if rtl_fm's SSB output can do wider bandwidths
[00:49] <Darkside> looks like it can!
[00:50] <mwheeler> dumb radio question, why would we prefer using SSB output ?
[00:50] <Darkside> we may be able to get better performance using a different FSK demodulator
[00:51] <mwheeler> ah ok
[00:51] <Darkside> and the one i'm thinking of using (david rowe's) takes SSB input
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[01:08] <Darkside> mwheeler: ok so yep, certainly possible to use rtl_fm to produce SSB output
[01:08] <Darkside> but im not so sure the gain control works proerly in SSB mode
[01:08] <Darkside> rtl_fm -f 405490000 -g 20.0 -M usb -s 48k -F9 | ./fsk_demod -t 2 48000 4800 - - 2> >(python fskdemodgui.py --wide) | python bits_to_samples.py | sox -t raw -r 48k -e s -b 8 -c 1 - -r 48000 -b 8 -t wav - | ./rs41mod
[01:09] <Darkside> in auto gain mode i get nothing
[01:11] <Darkside> other issue is i think fsk_demod takes too long to get a lock on the signal, and the CRC always seems to fail
[01:12] <Darkside> though the data looks good
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[02:51] <mwheeler> Darkside: I love that half the SDR things I google end up at either your blog or your github
[02:51] <Darkside> wat
[02:51] <Darkside> what was it this time :P
[02:52] <mwheeler> "soapysdr python fsk"
[02:53] <mwheeler> second hit
[02:53] <Darkside> oh
[02:53] <Darkside> allthefsks
[02:53] <Darkside> man that was a long time ago
[02:53] <Darkside> it doesnt reall ywork that well either
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[05:11] <mwheeler> Darkside: I got a second launch but it doesn't appear to be a normal rs92
[05:11] <Darkside> how so?
[05:11] <Darkside> doesn look to be reporting as an ozone sonde
[05:12] <mwheeler> sorry I mean it appears to be a normal rs92
[05:12] <Darkside> oh
[05:12] <Darkside> weird
[05:14] <Darkside> not sure it was launched out of broadmeadows either
[05:15] <Darkside> the first location you saw it would make sense for a tullamarine launch
[05:17] <mwheeler> maybe just seeing what's up with the storm front I guess
[05:17] <Darkside> could be
[05:17] <Darkside> well, my car is nice and clean for passengers now :-0
[05:17] <Darkside> :-)
[05:18] <mwheeler> Car goes in for oil change and tyre change tomorrow. Nothing beats last minute planning
[05:20] <Darkside> lol
[05:20] <Darkside> yeep
[05:20] <Darkside> tomorrow is packing
[05:20] <Darkside> loading up car with all the essentials for balloon chases :-)
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[05:30] <SpacenearUS> New vehicle on the map: 03Hg8lxl-12_chase - 12https://tracker.habhub.org/#!qm=All&q=Hg8lxl-12_chase
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[07:02] <SpacenearUS> New vehicle on the map: 03VK5QI_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5QI_chase
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[07:42] <sq6pog> Hi, I'd like to approve flight for habitat
[07:46] <Darkside> join #habhub and paste in the flight document ID
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[11:16] <Darkside> mwheeler: place your bets!
[11:16] <Darkside> (it would also help if mine wax actually running)
[11:16] <Darkside> was*
[11:18] <Darkside> boom
[11:18] <SpacenearUS> New position from 03YPADSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
[11:19] <mwheeler> Darkside: I think I won. I picked up the sonde many hours ago :P
[11:20] <Darkside> lol
[11:20] <Darkside> suuuure
[11:20] <Darkside> so something i noticed then was it detected it as -RS92
[11:20] <SpacenearUS> New position from 03YPPHSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPPHSONDE
[11:21] <Darkside> which is supposedly to do with the FM demod being 'inverting'
[11:21] <Darkside> but im not really sure its an issue for us
[11:21] <Darkside> so i might comment out the line in rs_detect.c which prints the '-'
[11:21] <mwheeler> oh yeah I noticed that before as well when I had really poor signal
[11:21] <Darkside> hrm
[11:21] <Darkside> oh wiat, its a bitfield in the return code
[11:22] <mwheeler> rockhampton sonde I think only gets launched the morning and I didn't see today with the new antenna. Probably need it to come south to pick it up from that station
[11:22] <mwheeler> hmm where is Melbourne sonde
[11:23] <mwheeler> oh it is going, it's just it wasn't old enough to trigger the irc bot
[11:24] <Darkside> heh
[11:24] <mwheeler> urgh which means the predicted landing is broken on it again lol
[11:24] <Darkside> could set the history time to 3 or 4 hours
[11:25] <mwheeler> hmm
[11:33] <SpacenearUS> New position from 03IV3SRD-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[11:46] <SpacenearUS> New vehicle on the map: 03DC2EH-6 - 12https://tracker.habhub.org/#!qm=All&q=DC2EH-6
[12:02] <SpacenearUS> New vehicle on the map: 039A3ZI-9 - 12https://tracker.habhub.org/#!qm=All&q=9A3ZI-9
[12:06] <SpacenearUS> New vehicle on the map: 039A3ZI - 12https://tracker.habhub.org/#!qm=All&q=9A3ZI
[12:09] <SpacenearUS> New vehicle on the map: 039A3ZI-12 - 12https://tracker.habhub.org/#!qm=All&q=9A3ZI-12
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[12:19] <qiaunus> Hi everyone, I am in need of some help to write a script that would allow me to transmit RTTY using the NTX2B radio transmitter
[12:20] <qiaunus> I've seen the guide on the UK HAS website but I'm using a RPi and writing my scripts in python
[12:21] <qiaunus> I'm struggling to convert the script on UKHAS into python language
[12:21] <qiaunus> would really appreciate any help anyone could offer
[12:21] <Darkside> how are you intending on modulating the NTX2B?
[12:21] <qiaunus> I'm using a voltage divider
[12:22] <Darkside> i mean, are you using the output of a UART?
[12:22] <qiaunus> send
[12:22] <qiaunus> the TX pin on my RPi
[12:22] <Darkside> right
[12:22] <qiaunus> sorry, I meant "yes"
[12:22] <Darkside> in which case you use pyserial
[12:22] <Darkside> and set the baud rate very low
[12:23] <Darkside> have a look at the pyserial documetation: https://pythonhosted.org/pyserial/shortintro.html
[12:24] <Darkside> essentially RTTY is just RS232 over FSK
[12:25] <Darkside> as in, <start bit><data><stop bit>
[12:26] <qiaunus> I see
[12:26] <Darkside> anyway, have a go at sending data out the UART using pyserial, and you should be able to decode that using dl-fldigi
[12:26] <qiaunus> so, I don't need to write any code to convert my data string into zero's and one's
[12:26] <Darkside> correct
[12:26] <qiaunus> transmitting over serial takes care of that?
[12:26] <Darkside> yup
[12:26] <qiaunus> right]
[12:27] <Darkside> now you need to think about how you're going to get GPS data into the Pi
[12:27] <Darkside> now that you're using your one UART for sending RTTY
[12:30] <qiaunus> I thought that wouldn't be an issue...
[12:31] <Darkside> well i mean, you could use a USB gps
[12:34] <qiaunus> so, I can't really share the TX pin between the GPS module and the NTX2B? I would only use the TX pin to initialise the GPS module, then it would be free to transmit RTTY.. that was my thinking anyway.. would that not work?
[12:34] <daveake> There are UBlox USB GPS units on ebay for £7 delivered from China; they work fine on the Pi
[12:34] <Darkside> qiaunus: youd have to switch baud rates to be able to receive data from the gps
[12:34] <daveake> Yes you can do it that way - my first few Pi flights did exactly that
[12:35] <Darkside> but as daveake said, there are really cheap ublox usb modules on ebay, and they work really wll
[12:35] <daveake> It's a pain and you have some Tx downtime while you wait for the GPS position
[12:35] <Darkside> https://www.ebay.com.au/itm/VK-172-USB-GPS-Ublox-G-Mouse-GPS-GLONASS-Support-Win7-Win8-Vista-XP-CE/162814067412?hash=item25e87982d4:m:mwPpT57NF9payZSGUpz1vSg
[12:35] <Darkside> this kind
[12:35] <Darkside> i've used these with good success on numerous flights
[12:36] <Darkside> and i even have a nice python module to handle comms with it
[12:36] <Darkside> https://github.com/projecthorus/wenet/blob/master/tx/ublox.py#L1163
[12:48] <qiaunus> that makes sense, I wish I'd discussed this with you guys earlier
[12:49] <qiaunus> right now, I have a working adafruit GPS module and I'm able to read the GPS data over serial
[12:49] <Darkside> hrm, adafruit gps
[12:49] <Darkside> i *think* they are ok
[12:49] <Darkside> daveake: have you used one?
[12:49] <daveake> No, but Upu knows about them
[12:50] <Darkside> i know someone here has flown one and found it worked up to some altitude
[12:50] <daveake> I think the Ultimate one is OK
[12:50] <Upu> Well you say that
[12:50] <daveake> heh
[12:50] <Upu> but I had someone say a recent one capped out at 12km
[12:50] <Upu> so good luck
[12:50] <Darkside> oh goody.
[12:50] <daveake> oops
[12:50] <Upu> Adafruit are very vague "suitable for high altitude use"
[12:50] <daveake> Have they possibly switched to UBlox then ?
[12:50] <Upu> when they capped at 27km
[12:50] <Darkside> lolno
[12:50] <daveake> heh
[12:51] <Darkside> daveake: still mediatek
[12:51] <Upu> no still MTK
[12:51] <daveake> ta. Maybe different model or firmware
[12:51] <Upu> qiaunus: mail Adafruit ask for clarification on the exact altitude limit
[12:51] <Upu> or don't fly it
[12:51] <Upu> and get a Ublox
[12:51] <Darkside> qiaunus: i'd seriously suggest getting one those ublox USB gps's
[12:51] <Darkside> they work fine
[12:51] <Darkside> Upu: you should do a USB-connected GPS unit :-)
[12:51] <qiaunus> ok, I'll look into that then
[12:51] <Darkside> using a NEO-8 or something
[12:52] <qiaunus> sounds like it might be simpler afterall
[12:52] <qiaunus> and would actually work upto a higher altitude
[12:52] <Darkside> and safer!
[12:52] <Upu> https://store.uputronics.com
[12:52] <Upu> thats my shop
[12:52] <Darkside> Upu: he needs a USB-connected one to avoid the uart conflict crap
[12:53] <Upu> oh
[12:53] <Darkside> as he's using the UART to drive a NTX2
[12:53] <Darkside> and talking to it via I2C is a pain
[12:53] <Darkside> as daveake is well aware
[12:54] <daveake> :)
[12:54] <Darkside> frigging bullshit raspberry pi I2C
[12:54] <daveake> yup
[12:54] <Upu> Just any old FT232 + a normal breakout ?
[12:54] <Darkside> Upu: yeah that'd work too
[12:54] <Darkside> i suspect the ebay ones will end up being cheaper though :-)
[12:54] <Upu> certainly
[12:54] <Darkside> https://www.ebay.com.au/itm/VK-172-USB-GPS-Ublox-G-Mouse-GPS-GLONASS-Support-Win7-Win8-Vista-XP-CE/162814067412?hash=item25e87982d4:m:mwPpT57NF9payZSGUpz1vSg
[12:54] <qiaunus> thanks for your inputs guys, I gotta run just now but I'll get in touch if any issues
[12:54] <Upu> but again good luck
[12:54] <Darkside> i've flown those a few times
[12:55] <Darkside> and i've confirmed they can run down to about 3.5v supply voltage on the '5V' rail
[12:55] <Upu> may or may not contain actual Ublox
[12:55] <Darkside> Upu: well it responds to the ublox binary command set and works up to 37 km!
[12:55] <Upu> fair enough then
[12:56] <Upu> I would be interested to know the actual limit of the Adafruit but I don't think even they know
[12:56] <daveake> I'm trying to remember if I've flown one of them or not. I think not. I do have some trackers made up with them, and I use them in chase-car Pi setups
[12:56] <Upu> I got a sample one to 37km before I dropped it in the english channel
[12:56] <Darkside> get one and test it with gnss-sdr-sim :-)
[12:57] <Darkside> daveake: i have had some issue with a few of them not getting lock quickly, but i suspect i may have zapped the antennas on them
[12:57] <Darkside> as i had them out of their plastic shell
[12:57] <daveake> OK - mine have all been quick at that
[12:57] <Darkside> yeah most of them were fine
[12:57] <Darkside> i also wrote my little python library to be a bit 'robust' in the presence of usb bus glitches
[12:58] <Darkside> as in the application i was using it in, that would happen occasionally (USB webcams... ughhhh)
[12:59] <daveake> nice
[12:59] <Darkside> anyways... all my wenet flights have used them
[12:59] <Darkside> https://camo.githubusercontent.com/470be121384cd709addce53fc5fdb97c4c4f0070/687474703a2f2f7266686561642e6e65742f74656d702f686f7275735f34325f736d616c6c2e6a7067
[12:59] <Darkside> used for the overlay
[13:00] <Darkside> oh sorry that was the low-res version... http://rfhead.net/temp/horus_42_full.jpg
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[13:02] <daveake> I have some other usb gps units; I forget which way round it is but some end up as ttyUSB0 and others as ttyS0
[13:02] <Darkside> the ublox ones are nice as they are an ACM serial device, so end up as /dev/ttyACM0
[13:03] <daveake> Ah that's the one, not S0
[13:03] <daveake> Was trying to remember :)
[13:03] <Darkside> and i just made a udev rule to symlink it to /dev/ublox
[13:03] <Darkside> just in case it disconnected/reconnected and ended up on /dev/ttyACM1
[13:03] <Darkside> as i have seen happen
[13:04] <daveake> I had some fun with udev recently - customer wanted a load of USB serial devices to always adopt the same device names on bootup
[13:04] <Darkside> and all the device serial numbers were the same?
[13:04] <Darkside> or all 0 ?
[13:04] <daveake> You think they had serial numbers? :/
[13:04] <daveake> Yeah had to tie to USB port
[13:04] <Darkside> real ftdi chips do!
[13:05] <daveake> I know :)
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[14:33] <PE2BZ> Darkside I am setting up auto_rx now and I like the white black and grey list !
[14:33] <PE2BZ> 403.9
[14:33] <PE2BZ> that should be in the grey list...
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[16:02] <PE2BZ> Darkside any help on rtl_fm: undefined symbol: rtlsdr_set_bias_tee
[16:02] <PE2BZ> ?
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[16:14] <Ian_> Today my wife bought tulips for the New Year and I thought of you.
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[16:16] <Ian_> Just what I think of as a good/likely guess, but undefined symbol rtlsdr_set_bias_tee is likely to be 1 or 0, true or false. To switch on power supply for an active antenna.
[16:19] <Ian_> define it: #define rtlsdr_set_bias_tee 0 then suck it and watch for a swallow or a bleat from the software. Check any #defines that you might have commented out of course as it may be hiding in plain sight somewhere.
[16:20] <Ian_> PE2BZ ^^ (Merry Christmas and a Happy/Prosperous New Year)
[16:36] <PE2BZ> Ian_ say thanks to your wife for supporting my job :-)
[16:37] <Ian_> :)
[16:39] <PE2BZ> But back to the biastee.... If I just simply run the instructions from https://osmocom.org/projects/sdr/wiki/rtl-sdr which I have done on many linux machines before all rtl_fm and power tools escape with the error message....
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[16:47] <SpacenearUS> New position from 03U3S20 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=U3S20
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[17:41] <zyp> Ian_, rtlsdr_set_bias_tee sounds like a function to me, defining a function name to 0 should give you some fun compiler errors afterwards :)
[17:42] <Laurenceb_> oh that shizzle
[17:42] <Laurenceb_> yeah that was "fun"
[17:42] <Laurenceb_> my airspy was basically non functional until I tweaked all the gain values
[17:42] <Laurenceb_> !whereis HIRFW-6
[17:42] <SpacenearUS> 03Laurenceb_: 03HIRFW-6 was over 03Tashlinsky District, Orenburg Oblast, Russia 10(51.48107,52.96215) at 0312999 meters about 032 days ago
[17:48] <Ian_> Thanks zyp, I have asked Mr G and he seems to be at a bit of a loss. Sounds like a library got changed or omimtted in an upgrade . . .
[17:48] <Ian_> ommitted
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[17:57] <PE2BZ> So now I am part of an ommitted upgrade ? How can that then.....
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[17:57] <Ian_> https://github.com/ptrkrysik/gr-gsm/issues/297 There are roughly 45 forks of the rtl-sdr software - only one is certain to work with gr-osmosdr, namely the library from https://git.osmocom.org/rtl-sdr
[17:58] <Ian_> I've stopped guessing :)
[17:58] <Ian_> Forty Five and then we wonder how problems occur . . .
[17:58] <Ian_> Fork me . . .
[18:03] <Ian_> I had originally thought that upgrades are improvements, but occasionally they break things, but it seems more like there has been a lot of uncoordinated fettling going on, with subsequent confusion.
[18:05] <Ian_> PE2BZ How can that be? - I just make this stuff up, ficticiously sounds about right :)
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[18:23] <SpacenearUS> New position from 03BB02 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=BB02
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[18:34] <PE2BZ> https://github.com/steve-m/librtlsdr/releases this one works with rtl_fm and so on wihtout the biastee undefined bs error :-)
[18:34] <PE2BZ> 0.5.3 that is
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[19:02] <SpeedEvil> https://www.ebay.co.uk/itm/Infrared-Induction-Flash-Flying-Ball-Colorful-LED-Disco-RC-Helicopter-Toy-New-BF/372152842121
[19:02] Action: SpeedEvil wonders how high this goes if you disable the hover mode.
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[19:30] <PE2BZ> Darkside auto_rx seems much improved. Decoded my local rs41´s within seconds :-)
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[19:38] <fsphil> not so good with mine :)
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[19:48] <PE2BZ> fsphil still no luck ?
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[19:51] <Ian_> Another problem solved Ben :)
[19:52] <PE2BZ> fsphil what system do you run it on ?
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[19:57] <PE2BZ> I have it running on a Pi model B, with the rtl-sdr drivers from 2014, first started rtl_tcp to check best settings for ppm and gain and then did the auto_rx setup
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[20:28] <mwheeler> PE2BZ: did you get it up and running?
[20:29] <mwheeler> ah wait, just saw your latest messages; I should really read before typing :)
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[21:30] <Bob_ZL1RS> David-SM1ULC here?
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[22:00] Nick change: laurence_ -> Laurenceb_
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[23:20] <SpacenearUS> New position from 03YPPHSONDE after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPPHSONDE
[23:20] <SpacenearUS> New position from 03YPADSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YPADSONDE
[23:20] <Darkside> yay
[23:27] <SpacenearUS> New position from 03YMMLSONDE after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YMMLSONDE
[23:27] <Darkside> mwheeler: sloooow :-)
[23:27] <Darkside> maybe they were having a cuppa
[23:27] <mwheeler> Urgh I was hoping you wouldn't notice
[23:28] <mwheeler> Someone forgot to change the battery again
[23:29] <mwheeler> I'm up about 1km altitude so I could have won this morning too :p
[23:30] <SpacenearUS> New position from 03CBAYSONDE after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=CBAYSONDE
[23:30] <fsphil> sweet
[23:34] <fsphil> filtering out the stuff < 200mhz seems to have helped
[23:34] <fsphil> so far anyway
[23:36] <fsphil> ooh temperature seems to be working
[23:37] <mwheeler> but is it correct
[23:37] <fsphil> mmm
[23:37] <fsphil> fair point
[23:39] <fsphil> https://www.digikey.com/product-detail/en/murata-electronics-north-america/RF1419D/583-1065-2-ND/1918878
[23:39] <fsphil> good saw filter for the sonde band. just need someone to order 500 :)
[23:39] <daveake> samples ...
[23:39] <fsphil> ooooooh
[23:40] <daveake> Or suggest to Upu that he enter the sonde-amp business :)
[23:41] <fsphil> he'd definitly sell 10s of them
[23:41] <daveake> heh
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[23:43] <fsphil> hmm,, not decoding the sonde anymore. guess the filtering didn't help
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[23:46] <fsphil> no stil going, kinda
[23:56] <Darkside> -20 at 5 km alt could make sense
[23:56] <Darkside> -20 degrees C that is
[23:56] <Darkside> for night-time, and in winter
[23:57] <Darkside> mwheeler: i think we need a better way of handling invalid temperature data...
[23:57] <Darkside> not sure just setting it to -273 is that good of an idea
[23:58] <mwheeler> Yeah
[00:00] --- Sat Dec 30 2017