--- Log opened Mon Jul 18 00:00:24 2022
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06:44 < kanzure> hmph
07:32 < pasky> L29Ah: innocentive has an assortment of random topics
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10:44 < lsneff> Gonna design an e-reader I think
10:45 < lsneff> Unhappy with the current options
10:45 < lsneff> Rendering ebooks will be tricky, especially if I don't want to run linux on it, but I have an idea of how to make it happen
10:45  * L29Ah just uses a laptop
10:45 < lsneff> I like reading books on eink
10:45 < L29Ah> add NCR18650Bs until you have enough battery life
10:46 < lsneff> And having a device that lasts like a month is great
10:46 < fenn> muurkha has a similar project going
10:46 < fenn> please don't needlessly duplicate effort
10:47 < L29Ah> and don't forget to take your metformin
10:47  * fenn sets an alarm to take melatonin
10:47 < fenn> got it
10:49 < lsneff> I'm very particular about hardware I use
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13:53 < kanzure> https://www.cryptomuseum.com/covert/bugs/selectric/
14:06 < L29Ah> > Another very effective counter-countermeasure, is to plant a plethora of inexpensive diodes at locations that are likely to be swept with an NLJD. This will generate so many false positives that it masks the presence of the actual bug(s). This method was used by the Russians in the 1980s, during the construction of the (then ) new American embassy in Moscow. Diodes were mixed into the building's conc
14:06 < L29Ah> rete, making the detection of real listening devices virtually impossible [2]. 
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15:31 < muurkha_> fenn: please do needlessly duplicate effort
15:32 < muurkha_> because most ambitious projects fail, so you need to have several people attempting them to get success
15:33 < muurkha_> L29Ah: GOES satellites are either always over your head or always not
15:33 < muurkha_> because geosynchronous
15:35 < muurkha_> fenn: life expectancy increases since 01970 is largely a matter of the elimination of communism, but some technical progress has also had significant benefits
15:36 < muurkha_> in particular, oral rehydration therapy was discovered around 01973 and dramatically reduced the death rate from diarrhea
15:37 < muurkha_> also though the survival rates with optimal treatment from many cancers are dramatically better since 01970
15:38 < muurkha_> but the big, big deal is that in 01970 80% of the planet was in profound poverty, much of it kept there by communism, and now it isn't
15:39 < muurkha_> I mean communism isn't the only -ism villain there, colonialism is what created those conditions of poverty to begin with in most places
15:40 -!- muurkha_ is now known as muurkha
15:43 < L29Ah> muurkha_: what are you referring to wrt GOES?
15:43  * L29Ah doesn't recall writing anything about satellites here
15:43 < muurkha> the GOES weather satellites (flown by NOAA) are in geosynchronous orbits, so you don't have to wait for the to be overhead
15:44 < L29Ah> ah, but GEO is too far for my equipment
15:44 < muurkha> fenn: I think in fact setting up an emulator to run CP/M is actually a trivial task one does for fun
15:44 < L29Ah> and even with sun-synchronous NOAA stuff i can't get enough signal over the noise
15:44 < muurkha> ah :(
15:44 < L29Ah> even though i got them under 1000km close
15:45 < muurkha> how strong is the signal?
15:45 < muurkha> a thing about geosynchronous orbit is that it makes it a *lot* easier to point a high-gain dish at the satellite
15:45 < L29Ah> idk, a few dB over the noise at most
15:46 < muurkha> 20 dBi is easy with a small dish, 40 dBi is attainable if you have a rooftop or yard
15:46 < muurkha> while pointing a high-gain antenna at a LEO satellite involves servomotors
15:46 < L29Ah> https://tinystash.undef.im/il/29qxPvWG4qcEBtzqwtRjkKVVCop9Ht4sCQWGAM8JM7WHLaRmkvCnupoKura9m7GhMbMnBnYetCkTeYAM6Y9cEW7F.png
15:47 < L29Ah> muurkha: i have a V-dipole :)
15:47 < muurkha> pointing a high-gain antenna at a GEO satellite typically involves bending some metal bits by hand
15:47 < muurkha> yeah, a 3dBi dipole is going to make it more challenging
15:48 < L29Ah> i hoped it would attenuate much of the noise; seems like i need a high-pass to kick out the nearby FM transmitter that shits all over at least
15:48 < L29Ah> and i happened to land in a state where there's no electronic components store :O
15:48 < muurkha> that waterfall doesn't look so bad, you can visually see the signal pulsing on and off
15:49 < muurkha> is the NOAA satellite signal actually narrowband FM?
15:49 < L29Ah> yeah but the apt decoder can't make sense of it, and i'm being lazy to play with gnuradio filters
15:49 < L29Ah> it is PSK afair
15:50 < muurkha> aha, makes sense
15:50 < muurkha> sounds like you have a path to solving the problem
15:50 < muurkha> is there ECC?
15:50 < L29Ah> no
15:50 < muurkha> so your best bet is more directionality
15:51  * L29Ah hoped to avoid having to mess with aiming at the satellite, since he had multiple people obtaining good results with a V-dipole
15:52 < L29Ah> tho probably they have a less noisy neighbourhood or better rtlsdr impl
15:52 < L29Ah> s/had/heard/
15:58 < muurkha> possibly.  you could also probably use a phased array of two dipoles to get another 3 dB
15:58 < muurkha> also though maybe better filtering will be enough
15:58 < muurkha> because the signal does look pretty decent in the waterfall diagram
15:59 < muurkha> (disclaimer: I've never done this!  so I could be misleading you)
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18:03 < L29Ah> https://tinystash.undef.im/il/5xgs8TD7VBcHA2t9e3HMQ3YD4EZ1wsYKQKafzUSHiCX4LGqqVoSgLo4gGshY9MKHJjvrMV7N62qhhiPrSce3hgXu.png the best i could decode so far, despite seeing the signal at 5-10dB over the noise in gqrx
18:04 < L29Ah> muurkha: i can toss you the raw data of a recorded satellite pass if you feel like playing with DSP
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18:24 < muurkha> sure!  I'll try hacking on it in the morning
18:29 < kanzure> https://www.sideranch.co.jp/gingateikoku/
18:30 < kanzure> https://myanimelist.net/manga/60395/Ginga_Teikoku_Kouboushi
18:31 < muurkha> .t
18:31 < saxo> Ginga Teikoku Kouboushi | Manga - MyAnimeList.net
18:33 < L29Ah> muurkha: http://[2a06:a003:9032::2]:8080/2022-07-17T11:32:00+02:00-18.dump.xz
18:33 < L29Ah> that's a dump of rtl_sdr at 1.5MSPS
18:34 < L29Ah> center frequency 137500000Hz
18:35 < L29Ah> NOAA-18 signal is seen the best at the middle of the pass
18:35 < muurkha> awesome!  fetching.  thank goodness for IPv6!
18:35 < L29Ah> and busybox :]
18:39 < muurkha> :)
18:51 < kanzure> google lense can translate manga apparently
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19:45 < kanzure> .title https://www.youtube.com/watch?v=t_4gd_wRT1s
19:45 < saxo> Isaac Asimov -1951 The Psychohistorians Shatner Audiobook - YouTube
19:45 < Muaddib> [t_4gd_wRT1s] Isaac Asimov -1951 The Psychohistorians Shatner Audiobook (58:14)
21:15 < L29Ah> muurkha: The signal itself is a 256-level amplitude modulated 2400Hz subcarrier, which is then frequency modulated onto the 137 MHz-band RF carrier. Maximum subcarrier modulation is 87% (±5%), and overall RF bandwidth is 34 kHz.
21:15 < L29Ah> probably plenty of clever filtering can be done, esp if one could account for doppler shifting
21:16 < muurkha> okay
21:17 < muurkha> when I've seen this kind of thing done in the past, people used satellite orbital monitoring software to calculate the doppler
21:17 < muurkha> but I bet it can be done empirically
21:17 < L29Ah> yeah
21:19 < muurkha> I mean after FM demodulation doppler is just a "dc" offset to the 2400Hz AM signal
21:19 < L29Ah> currently i'm using https://github.com/Xerbo/aptdec that takes FM-demodulated input as wav file
21:20 < muurkha> so far all I've done with the signal is aplay -f U8 though
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--- Log closed Tue Jul 19 00:00:25 2022