highaltitude.log.20190303

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[00:44] <SpacenearUS> New position from 03KD9AIQ-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD9AIQ-11
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[03:42] <mwheeler> oh yeah, there was nothing in atmos last night for Melbourne, so I guess they had some issues
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[03:56] <mwheeler> Darkside: the rs demodulators have Gps2Date that converts gps week and seconds to a date. Is this likely to break with the upcoming rollover?
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[04:02] <Darkside> mwheeler: quite possibly
[04:02] <Darkside> worth testing it
[04:10] <Darkside> i see a lot of magic numbers in there
[04:10] <Darkside> so i suspect it will break
[04:23] <Darkside> hrm
[04:23] <Darkside> maybe not
[04:26] <Darkside> the numbering passed into Gps2Date is > 1024
[04:27] <Darkside> i suspect we might be OK
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[07:45] <SpacenearUS> New position from 03SP9UOB-P32 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB-P32
[07:56] <TimMc_> N1201SA is $200+? yagi lol
[07:56] <Darkside> lol
[07:57] <Darkside> oh
[07:57] <Darkside> the twitter pic
[07:57] <TimMc_> mwheeler twitter stalkage VSWR
[07:57] <TimMc_> i thought it'd be cheaper :P
[07:59] <mwheeler> yeah
[08:01] <TimMc_> so many bushfires... hope the lithium batteries don't start them
[08:03] <mwheeler> TimMc_: did you fetch that sonde yesterday?
[08:04] <TimMc_> mwheeler: i failed. too dark and area was fenced off. no signal either
[08:05] <mwheeler> yeahh, I thought as much
[08:05] <mwheeler> oh well
[08:05] <TimMc_> i heard a continuous tone on 402.650 while there. Costco or hospital maybe
[08:05] <TimMc_> longer drive than estimated lol
[08:07] <TimMc_> gotta figure out scrollback and hilight in irssi
[08:08] <mwheeler> hehe
[08:20] <Darkside> /lastlog isyour friend
[08:44] <SpacenearUS> New position from 03BSS18 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS18
[08:47] <SpacenearUS> New position from 03U3B-25 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=U3B-25
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[09:03] <SpacenearUS> New vehicle on the map: 03DL4MDW-11 - 12https://tracker.habhub.org/#!qm=All&q=DL4MDW-11
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[12:08] <SpacenearUS> New position from 03CDJ3 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=CDJ3
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[12:29] <PE0SAT> !flights
[12:29] <SpacenearUS> 03PE0SAT: Current flights: 03PICO-32 144.251 MHz CTSTIA32/1000 10(33b0)
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[13:41] <SpacenearUS> New vehicle on the map: 03G8KHW_Tab2_chase - 12https://tracker.habhub.org/#!qm=All&q=G8KHW_Tab2_chase
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[14:21] <SpacenearUS> New vehicle on the map: 03ND6W-7 - 12https://tracker.habhub.org/#!qm=All&q=ND6W-7
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[16:13] <SpacenearUS> New vehicle on the map: 03SQ5PGC - 12https://tracker.habhub.org/#!qm=All&q=SQ5PGC
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[17:02] <M6OLZ> Hello,can I use Airspy Mini with radiosonde_auto_rx ,use the same R820T2 but USB chip is different
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[17:10] <SpacenearUS> New position from 03SP9UOB-P28 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB-P28
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[17:10] <SpacenearUS> New position from 03SP9UOB-P33 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP9UOB-P33
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[18:25] <SpacenearUS> New vehicle on the map: 03DN4MRM-14 - 12https://tracker.habhub.org/#!qm=All&q=DN4MRM-14
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[19:28] <dfm> Darkside: In script generate_lowsnr.py it is called baudrate, however the fsk-demodulator does not know if the actual bits are Manchester coded (symbol vs bits, I confuse them sometimes). Anyway, for rs92 it should be 4800, same as rs41.
[19:30] <dfm> Then I get 90/120 OK-frames at 10db (second run 83, I should average several runs). It is closer to rs41 and what I would expect.
[19:41] <dfm> dfm has about half the baudrate (symbol rate), so the noise floor gets raised higher.
[19:43] <dfm> Now I see, you also have "bitspersymbol", but is constant=1 for all? So this could be used, rs92: 4800/2, dfm: 2500/2.
[19:44] <dfm> So it depends on what you want to compare, symbols or information bits. And if the demodulator can distinguish this.
[19:45] <dfm> Then the frame duration could also be important, when considering ecc.
[19:45] <dfm> This is for the demodulator.
[19:49] <dfm> For decoding it is also interesting to compare, how the decoder decodes, when the signal is a certain amount over the noise floor, i.e. same noise floor and same signal db-level (maybe not just the maximum, average/integrated over some bandwidth).
[19:50] <dfm> This is what I see on the waterfall, the color intensity if you will.
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[19:53] <PE2BZ> Darkside I have also a IQ file from the newest iMet generation which launches from a military base in Belgium. It´s about 1 Gig in size because of large bandwidth recording. Are you interested ?
[20:01] <dfm> So if baud rate = symbols per second (and bit rate = bits per second, can't remember), then bitspersymbol would be 0.5 for manchester.
[20:02] <dfm> But as I said, I think for the demodulator it is enough to compare symbol rate.
[20:06] <dfm> And for bitrate, parity bits would have to be taken into account or ecc rate, e.g. 1/2 convolutional code for lms6.
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[20:37] <Viproz> Darkside, mwheeler I think we should add a few optional fields to decode.py, one for the number of GPS satellites and another one for the battery voltage
[20:37] <Viproz> we should add aux to the documentation too
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[21:32] <Pit[m]> add multi decoder like dxlAprs :)
[21:32] <Pit[m]> when 10 sondes on air, scanner had problems picking the right one
[21:34] <Darkside> Pit[m]: well you can add more SDRs
[21:34] <Darkside> but the multi-decoder thing is difficult to do
[21:35] <Darkside> Viproz: we currently export the sats field in the RS41
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[21:35] <Darkside> ah damn
[21:35] <Pit[m]> if the scanner could write his frequencys in the dxlAPRS file, it would be a very harmonic software combination
[21:36] <Darkside> unfortunately dxlAPES's source is incredibly difficult to read
[21:36] <SpacenearUS> New vehicle on the map: 03DL4MDW-11 - 12https://tracker.habhub.org/#!qm=All&q=DL4MDW-11
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[21:46] <dfm> darkside, maybe you have read, I think the rs92 was rated some 3db worse because, it had 2400 baud in the script, but it is 4800.
[21:46] <Darkside> yeah i was a bit confused about that
[21:47] <Darkside> i thought it as 2400 baud
[21:47] <Darkside> but yeah, ok, 2400 baud with manchester encoding
[21:47] <Darkside> well
[21:47] <Darkside> 2400 bit/s with manchester, so 4800 baud
[21:48] <Darkside> wil fix and re-run the analysis someetie this week
[21:48] <dfm> Yes, bit rate, if you will. But the demodulator does not know. that it is manchester. only a little, if you try to take advantage of manchester.
[21:49] <dfm> But then perhaps you would have to consider ecc parity bits and so on.
[21:49] <dfm> How did you "calibrate" the sonde power or signal level?
[21:50] <Darkside> made sure the sample as a high enough SNR , and measured the variance of the signal
[21:50] <Darkside> in my samples, the SNR of the signal is >40db
[21:50] <dfm> The noise raises the noise floor, somehow with the 2400-setting it was closer to rs41-4800 around -50db, maybe because of the rs41-threshold because of the pauses?
[21:51] <Darkside> the theshold setting is to pick out the bits of the file where there are packets
[21:51] <Darkside> otherwise the noise woud skew the calculated variance
[21:52] <dfm> However for detection and fft-scan, there it is more interesting (at least for me), how much the signal level is above noise floor, anyway how wide the signal is.
[21:52] <Darkside> there will be some error in the calculation of the variance due to signal power changing a little bit throughout the recording, but from what i've measured the changed in power <0.5db
[21:53] <dfm> thats what I see or gets my attention. the wider/faster signals need more power, but I like to compare "signal above noise", not normalized to 1Hz.
[21:53] <Darkside> sure, but the aim here was to compare modem performance
[21:54] <dfm> Yes, I know, that's ok.
[21:54] <Darkside> its not too hard to convert the Eb/N0 numbers to C/N
[21:54] <dfm> Yes.
[21:55] <Darkside> ok got to go...
[21:55] <Darkside> cya
[21:56] <dfm> What I mean, when you investigate signal-detection and peaks, the normalized numbers are not so apparent from the fft-view, you would have to consider bandwidth as well.
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[22:04] <happysat> nice wind speed 2night for the beauvechain dfm :d
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[22:19] <Pit[m]> storm tomorrow
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[23:19] <happysat> 250km jetstreams 0_o
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[00:00] --- Mon Mar 4 2019