highaltitude.log.20190130

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[00:47] <Viproz> I'm pulling my hair out trying to understand why the sample rate of a decoded FM signal is the same as his bandwidth, I kinda accept it for the SDR output but why is it still the same after a FM demodulation ?
[00:49] <Viproz> dbrooke, maybe you can help me understand this ?
[01:02] <Viproz> Wow I have an M10 5kHz off it's center frequency, no wonder auto_rx has trouble detecting it
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[08:10] <samg3> I want to listen to all possible Cube sats. What Frequencies are used in or reserved for CUBE sats?
[08:17] <samg3> Those guys http://www.skcube.sk/skcube/first-slovak-satellite-skcube/ have Primary and Secondary channel. Do people always have 2 channels?
[08:19] <samg3> They use GMSK (Gaussian Minimum Shift Keying). GMSK is advantageous because it reduces sideband power or the power that frequencies directly above or below a given channel produce, which prevents interference from signal carriers on adjacent frequencies. This is mostly advantageous to cell phone companies, which must ensure that their signals do not pick up any interference from other companies.
[08:19] <samg3> Although GMSK reduces sideband power, it increases modulation memory in digital devices in which a previously received signal acts as interference for subsequently received signals.
[08:20] <samg3> This phenomenon can cause digital devices to confuse various signals with each other and prevent the device from performing the correct functions.
[08:21] <samg3> To correct this issue, signals that GMSK shapes must also be equalized with complex algorithms on the receiving device, requiring more hardware and more advanced software. Is GMSK Modulation always used or very popular in CubeSats? Why?
[08:44] <viki84> Which receivers have Frequency Range over 5Ghz? I was looking into https://www.sdrplay.com but they cover up to 2Ghz.
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[08:51] <fsphil> huh
[08:52] <fsphil> Morning all. Morning is the period of time from sunrise to noon. There are no exact times for when morning begins and ends (also true for evening and night) because they can vary according to one's lifestyle and the hours of daylight at each time of year.
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[09:34] <SpacenearUS> New vehicle on the map: 03HORUSLORA1 - 12https://tracker.habhub.org/#!qm=All&q=HORUSLORA1
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[09:58] Nick change: pe2bz_ -> PE2BZ
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[11:22] <TimMc_> VK3FTMC setting up a radiosonde auto rx
[11:24] <Viproz> Good morning fsphil, indeed (12:24 local time).
[11:25] <Darkside> TimMc_: excellent!
[11:26] <Darkside> TimMc_: there's a radiosonde in the air right now, are you receiving it?
[11:29] <TimMc_> building CellSearch to set PPM correction
[11:29] <Viproz> Darkside, So I've been playing around with csdr, it seems that the bandwidth is still linked to the samplerate with this software, I don't understand why and I don't know if using a higher bandwidth just adds noise or if it also adds signal. The decoders seems to be really bad at detecting a RS with a higher bandwidth than necessary but with another way of detecting it I get a lot more header frames so maybe at some point a better detector is
[11:29] <Viproz> going to be necessary
[11:30] <Darkside> Viproz: higher bandwidth means more noise into the demod, which isnt a good thing
[11:30] <TimMc_> I was detecting peaks
[11:30] <Darkside> Viproz: yes i'm interested in what zilog80 was doing with an updated detector
[11:30] <Darkside> might be worth investigating that
[11:30] <Darkside> TimMc_: what kind of RTLSDR are you using? does it have a TCXO?
[11:31] <edmoore> Darkside> TimMc_: there's a radiosonde in the air right now, are you receiving it?
[11:31] <Viproz> Yeah I need to run some tests to see if it's better or worse, I might not have enough time though
[11:31] <edmoore> The listen to the wild - it's calling you.
[11:31] <edmoore> then*
[11:31] <edmoore> meh. it just sounded a bit Robert W Service
[11:31] <Darkside> edmoore: >_>
[11:32] <TimMc_> Darkside: RTLSDR v3 with a Signal Stuff Signal Stick and rpi 3
[11:32] <Darkside> ok
[11:33] <Darkside> rtlsdr v3 shoudl be find without PPM correction
[11:33] <Darkside> they are usually within 1ppm out of the ziploc bag
[11:35] <Viproz> Darkside, https://gist.github.com/Viproz/02a6e55cf53e2cf5486b25d9eb614481#file-file-cpp-L98 that's one way of doing it, using a sum of sample per bit length and deciding with the whole sum, it might be computing intensive though
[11:35] <Darkside> Viproz: i was wondering about just spinning up a bunch of parallel demodulators
[11:35] <Darkside> and looking for a valid packet
[11:37] <Viproz> the demodulator are as good as detecting packets as rs_detect is today
[11:37] <Darkside> mm
[11:38] <Darkside> so we could record a few seconds of IQ data, then run up a set of demodulators in sequence (or in parallel) with the appropriate FM demodulator or whatever
[11:38] <Darkside> or FSK Demodulator
[11:38] <Viproz> and on a RPi 3 B+ I don't think you can run much more than 10 demodulators at the same time so if you have 2-3 SDR you would start lacking power
[11:38] <Darkside> if we do the record first, then we could probably run the demodulators in sequence
[11:38] <Darkside> i suspect it wouldnt take that long
[11:39] <Darkside> as they woudl run faster than realtime
[11:39] <Viproz> You can run some in parallel, just not too many
[11:39] <Darkside> ok
[11:39] <Darkside> well, definitely something worth investigating i think..
[11:41] <Viproz> Indeed, I have a 10 min sample of raw rtl_sdr output with an M10 (and a 1 min one), I'll do some testing with it
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[12:08] <Darkside> Lahti: i like your RX station :-)
[12:08] <Darkside> Lahti: you can spy on vaisala's test programs :D
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[12:12] <fsphil> what are the odds their test launches don't have the read-protect enabled? :)
[12:16] <daveake> :)
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[12:56] <TimMc_> Detecting Peaks on 401.49 and 401.56 but unable to decode and find sonde
[13:11] <TimMc_> Tried another RTLSDR v3 and radio sonde auto rx is deciding!
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[14:18] <SpacenearUS> New vehicle on the map: 03YO3ICT_Chase_chase - 12https://tracker.habhub.org/#!qm=All&q=YO3ICT_Chase_chase
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[15:03] <SpacenearUS> New vehicle on the map: 03ex2 - 12https://tracker.habhub.org/#!qm=All&q=ex2
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[17:20] <Viproz> MeteoModem are testing some fresh RS, they launched one that was manufactured in January 2019 today
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[17:45] <Lahti> hey
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[17:47] <Lahti> test
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[18:23] <PE2BZ> Viproz was that the double signal on 400.200 and 400.400 around 4 o clock this afternoon ?
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[19:08] <Viproz> PE2BZ, The one I got was on 400.4, I didn't get anything on 400.2 but I wasn't looking so maybe it just locked onto the 400.4 one and didn't switch
[19:09] <Viproz> 400.4 was at an altitude of 4787m at 16:39 UTC
[19:09] <Viproz> https://radiosondy.info/sonde_archive.php?sondenumber=ME562629
[19:10] <PE2BZ> I assume there where 2 tied to one balloon
[19:10] <PE2BZ> http://www.pe2bz.nl/hamradio/skymonitor/rtlTest_power.png
[19:10] <PE2BZ> At the left, 2 signals with the same pattern in strenth
[19:11] <Viproz> I wish we had something to decode multiple RS that have frequencies close together ;)
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[19:15] <Viproz> 2019-01-30 14:31:08,317 INFO:Scanner #0 - Detected peaks on 11 frequencies (MHz): [ 403.2 400.4 400.41 400.21 401.58 400.2 401.42 404. 401.18It tried to decoded it but failed at the start and later it 400.4 was first on the list
[19:16] <Viproz> You must have a big storage to store all of the IQ of the day, I wish I could do the same
[19:17] <daveake> I wish the NI sonde and the east England sonde were on different frequencies :/
[19:17] <Viproz> They launch everything on the same frequencies ? :o
[19:20] <daveake> Those 2 are. Other UK ones aren't
[19:21] <daveake> For those of us ~halfway between the 2 sites, it's not ideal :)
[19:22] <PE2BZ> Viproz 5 TB in raid 5 with normal HDD´s. Not possible to play back when recording, have to stop recording first. No budget for 5 TB SSD (yet...)
[19:22] <PE2BZ> daveake shoot the one which is travelling away from you ;-)
[19:24] <daveake> :)
[19:24] <daveake> 8TD USB3 HD is around ¬160 ... bought one a few weeks ago
[19:24] <daveake> To backup two RAID servers :)
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[19:27] <Viproz> Nice, now imagine a RPi driving all of this :D
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[19:40] Nick change: Steffann -> Steffanx
[19:47] <Lahti> Darkside: Hey Darkice thank you, I have been hunting vaisala 3 pieces double test sonde
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[20:04] <PE2BZ> Lahti any luck ?
[20:08] <Lahti> yes and 12 normal sonde, here Vaisala double and normal sonde https://aijaa.com/8Kjqyx
[20:09] <PE2BZ> Nice catch !
[20:09] <PE2BZ> Can I have a closeup of the text on the label ?
[20:10] <PE2BZ> and can I share your image ?
[20:10] <Lahti> now snow 50cm bad hunt sonde
[20:11] <PE2BZ> afk back later.
[20:16] <Lahti> Close up of a label https://aijaa.com/OlIynf
[20:19] <Lahti> offcourse share image
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[21:33] <SpacenearUS> New vehicle on the map: 03VK5NE_chase - 12https://tracker.habhub.org/#!qm=All&q=VK5NE_chase
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[00:00] --- Thu Jan 31 2019