{"id":33117,"date":"2019-10-31T21:50:51","date_gmt":"2019-10-31T18:50:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chto-slyshno-v-radioefire-prinimaem-i-dekodiruem-naibolee-interesnye-signaly-chast-2-ukv\/"},"modified":"2019-10-31T21:50:51","modified_gmt":"2019-10-31T18:50:51","slug":"chto-slyshno-v-radioefire-prinimaem-i-dekodiruem-naibolee-interesnye-signaly-chast-2-ukv","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/chto-slyshno-v-radioefire-prinimaem-i-dekodiruem-naibolee-interesnye-signaly-chast-2-ukv","title":{"rendered":"\u010co po\u010du\u0165 v r\u00e1diovom \u00e9teri? Pr\u00edjmame a dek\u00f3dujeme najzauj\u00edmavej\u0161ie sign\u00e1ly. \u010cas\u0165 2, UKV","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ahoj, Habr.<\/p>\n

V prvej \u010dasti<\/a><\/noindex> Boli op\u00edsan\u00e9 niektor\u00e9 sign\u00e1ly, ktor\u00e9 je mo\u017en\u00e9 zachyti\u0165 na dlh\u00fdch a kr\u00e1tkych vln\u00e1ch. Rovnako zauj\u00edmav\u00e9 je p\u00e1smo UKV, na ktorom sa d\u00e1 n\u00e1js\u0165 nie\u010do zauj\u00edmav\u00e9.<\/p>\n

\"\u010co
\nRovnako ako v prvej \u010dasti, bud\u00fa presk\u00faman\u00e9 tie sign\u00e1ly, ktor\u00e9 je mo\u017en\u00e9 samostatne dek\u00f3dova\u0165 pomocou po\u010d\u00edta\u010da. Komu to zauj\u00edma, ako to funguje, pokra\u010dovanie pod katom.
\n<\/a><\/noindex>
\nV prvej \u010dasti sme pou\u017eili holandsk\u00fd online prij\u00edma\u010d<\/a><\/noindex> na prij\u00edmanie dlh\u00fdch a kr\u00e1tkych v\u013an. Bohu\u017eia\u013e, na UKV s\u00fa \u0430\u043d\u0430\u043b\u043e\u0433ick\u00e9 slu\u017eby nedostupn\u00e9 \u2014 rozsah frekvenci\u00ed je pr\u00edli\u0161 ve\u013ek\u00fd. Preto t\u00ed, ktor\u00ed chc\u00fa zopakova\u0165 ni\u017e\u0161ie op\u00edsan\u00e9 experimenty, bud\u00fa musie\u0165 z\u00edska\u0165 vlastn\u00fd prij\u00edma\u010d, z najlacnej\u0161\u00edch m\u00f4\u017eeme spomen\u00fa\u0165 RTL SDR V3<\/a><\/noindex>, ktor\u00fd je mo\u017en\u00e9 zak\u00fapi\u0165 za 30$. Tento prij\u00edma\u010d pokr\u00fdva p\u00e1smo do 1,7 GHz, v\u0161etky ni\u017e\u0161ie op\u00edsan\u00e9 sign\u00e1ly boli prijat\u00e9 pr\u00e1ve na \u0148om. <\/p>\n

Tak sa pust\u00edme do toho. Rovnako ako v prvej \u010dasti, budeme sign\u00e1ly sk\u00fama\u0165 pod\u013ea rast\u00facej frekvencie.<\/p>\n

FM r\u00e1dio<\/h2>\n

\nSamotn\u00e9 FM r\u00e1dio asi nikoho neprekvap\u00ed, n\u00e1s v\u0161ak bude zauj\u00edma\u0165 RDS. Pr\u00edtomnos\u0165 RDS (Radio Data System) zabezpe\u010duje prenos digit\u00e1lnych \u00fadajov \u201evn\u00fatri\u201c FM sign\u00e1lu. Spektrum sign\u00e1lu FM stanice po demodul\u00e1cii vyzer\u00e1 takto:<\/p>\n

\"\u010co
\n
\nNa frekvencii 19 kHz sa nach\u00e1dza pilotn\u00fd t\u00f3n, a na jeho trojn\u00e1sobnej frekvencii 57 kHz sa pren\u00e1\u0161a sign\u00e1l RDS. Na oscilograme, ak zobraz\u00edme oba sign\u00e1ly spolu, to vyzer\u00e1 pribli\u017ene takto:<\/p>\n

\"\u010co
\n
\nS pomocou f\u00e1zovej modul\u00e1cie je tu zak\u00f3dovan\u00fd n\u00edzkofrekven\u010dn\u00fd sign\u00e1l s frekvenciou 1187,5 Hz (mimochodom, frekvencia 1187,5 Hz bola zvolen\u00e1 nie n\u00e1hodou \u2014 je to frekvencia 19 kHz pilotn\u00e9ho t\u00f3nu vydelen\u00e1 16). N\u00e1sledne, po bitovom dek\u00f3dovan\u00ed, sa roz\u0161ifruj\u00fa pakety d\u00e1t, ktor\u00fdch typov je dos\u0165 ve\u013ea \u2014 okrem textu m\u00f4\u017eu by\u0165 pren\u00e1\u0161en\u00e9 napr\u00edklad alternat\u00edvne frekvencie vysielania r\u00e1diovej stanice, a pri vjazde do inej oblasti sa prij\u00edma\u010d m\u00f4\u017ee automaticky naladi\u0165 na nov\u00fa frekvenciu. <\/p>\n

Prija\u0165 RDS \u00fadaje miestnych stan\u00edc je mo\u017en\u00e9 pomocou programu RDS Spy<\/a><\/noindex>. M\u00f4\u017ee sa pripoji\u0165 cez HDSDR, ak vyberieme modul\u00e1ciu FM, \u0161\u00edrku sign\u00e1lu 120 kHz a bitr\u00e1t 192 kHz, ako je zn\u00e1zornen\u00e9 na obr\u00e1zku.<\/p>\n

\"\u010co
\n
\nPotom sta\u010d\u00ed nasmerova\u0165 sign\u00e1l pomocou Virtual Audio Cable z HDSDR na RDS Spy (v nastaveniach VAC je tie\u017e potrebn\u00e9 uvies\u0165 bitr\u00e1t 192 kHz). Ak bolo v\u0161etko uroben\u00e9 spr\u00e1vne, uvid\u00edme v\u0161etky inform\u00e1cie o RDS, ove\u013ea viac, ne\u017e uk\u00e1\u017ee oby\u010dajn\u00fd dom\u00e1ci r\u00e1dioprij\u00edma\u010d:<\/p>\n

\"\u010co
\n
\nOkrem FM, m\u00f4\u017eete tie\u017e dek\u00f3dova\u0165 aj DAB+, o \u010dom sa hovorilo. samostatn\u00e1 \u010dl\u00e1nok<\/a><\/noindex>V Rusku zatia\u013e nefunguje, ale v in\u00fdch krajin\u00e1ch m\u00f4\u017ee by\u0165 aktu\u00e1lne.<\/p>\n

Leteck\u00e9 p\u00e1smo<\/h2>\n

\nHistoricky sa v letectve pou\u017e\u00edvaj\u00fa amplit\u00fadov\u00e1 modul\u00e1cia (AM) a frekven\u010dn\u00e9 p\u00e1smo 118-137 MHz. Komunik\u00e1cia pilotov a dispe\u010derov nie je nijako za\u0161ifrovan\u00e1 a m\u00f4\u017ee ju zachyti\u0165 ka\u017ed\u00fd, kto m\u00e1 z\u00e1ujem. Pred 20 rokmi na to 'pretahovali' oby\u010dajn\u00e9 lacn\u00e9 \u010d\u00ednske r\u00e1dioprij\u00edma\u010de \u2014 sta\u010dilo roz\u0161\u00edri\u0165 cievky heterod\u00fdnu a p\u00e1smo sa pos\u00favalo, ak sa podarilo, tak smerom k vy\u0161\u0161\u00edm frekvenci\u00e1m. Z\u00e1ujemcovia o 'digit\u00e1lnu archeol\u00f3giu' m\u00f4\u017eu \u010d\u00edta\u0165 diskusiu na f\u00f3re radioscanner<\/a><\/noindex> z roku 2004. Nesk\u00f4r \u010d\u00ednski v\u00fdrobcovia vy\u0161li v \u00fastrety pou\u017e\u00edvate\u013eom a jednoducho do r\u00e1di\u00ed pridali p\u00e1smo Air (v koment\u00e1roch k prvej \u010dasti odpor\u00fa\u010dali Tecsun PL-660 alebo PL-680). Av\u0161ak, samozrejme, pou\u017e\u00edvanie \u0161pecializovanej\u0161\u00edch zariaden\u00ed (napr\u00edklad prij\u00edma\u010dov AOR, Icom) je v\u00fdhodnej\u0161ie \u2014 maj\u00fa potla\u010denie \u0161umu (zvuk sa vypne, ke\u010f nie je sign\u00e1l a nie je st\u00e1le sy\u010danie) a vy\u0161\u0161iu r\u00fdchlos\u0165 preh\u013ead\u00e1vania frekvenci\u00ed.<\/p>\n

Ka\u017ed\u00e9 ve\u013ek\u00e9 letisko pou\u017e\u00edva pomerne ve\u013ea frekvenci\u00ed, tu je pr\u00edklad frekvenci\u00ed letiska Pulkovo, prevzat\u00fdch zo str\u00e1nky radioscanner:<\/p>\n

\"\u010co
\n
\nMimochodom, m\u00f4\u017eete po\u010d\u00fava\u0165 vysielania komunik\u00e1ci\u00ed z r\u00f4znych rusk\u00fdch miest (Moskva, S-Pb, \u010ce\u013eabinsk a niektor\u00e9 \u010fal\u0161ie) online na http:\/\/live.radioscanner.net<\/a><\/noindex>. <\/p>\n

Pre n\u00e1s je v leteckom p\u00e1sme zauj\u00edmav\u00fd digit\u00e1lny protokol ACARS<\/a><\/noindex> (Syst\u00e9m adresovania a reportovania leteck\u00fdch komunik\u00e1ci\u00ed). Jeho sign\u00e1ly sa pren\u00e1\u0161aj\u00fa na frekvenci\u00e1ch 131.525 a 131.725 MHz (eur\u00f3psky \u0161tandard, frekvencie v r\u00f4znych regi\u00f3noch m\u00f4\u017eu sa l\u00ed\u0161i\u0165<\/a><\/noindex>). Ide o digit\u00e1lne pakety s bitovou r\u00fdchlos\u0165ou 2400 alebo 1200 bps, pomocou tak\u00e9hoto syst\u00e9mu m\u00f4\u017eu piloti vymie\u0148a\u0165 spr\u00e1vy s dispe\u010derom. Na dek\u00f3dovanie v MultiPSK je potrebn\u00e9 nastavi\u0165 sa na sign\u00e1l v re\u017eime AM (potrebn\u00fd je SDR prij\u00edma\u010d, ke\u010f\u017ee \u0161\u00edrka p\u00e1sma sign\u00e1lu je v\u00e4\u010d\u0161ia ako 5 kHz) a presmerova\u0165 zvuk pomocou Virtual Audio Card. <\/p>\n

V\u00fdsledok je zobrazen\u00fd na sn\u00edmke obrazovky.<\/p>\n

\"\u010co
\n
\nForm\u00e1t sign\u00e1lov ACARS je pomerne jednoduch\u00fd a d\u00e1 sa pozrie\u0165 v programe SA Free. Na to sta\u010d\u00ed otvori\u0165 fragment z\u00e1znamu a uvid\u00edme, \u017ee v 'n\u00fatri' AM z\u00e1znamu sa v skuto\u010dnosti nach\u00e1dza frekven\u010dn\u00e1 modul\u00e1cia.<\/p>\n

\"\u010co
\n
\n\u010ealej, pou\u017eit\u00edm frekven\u010dn\u00e9ho detektora na z\u00e1znam, \u013eahko z\u00edskame bitov\u00fd tok. V skuto\u010dnosti to mo\u017eno nebude potrebn\u00e9, preto\u017ee hotov\u00e9 programy na dek\u00f3dovanie ACARS u\u017e d\u00e1vno existuj\u00fa.<\/p>\n

Meteorick\u00e9 satelity NOAA<\/h2>\n

\nPo po\u010d\u00favan\u00ed rozhovorov pilotov sa m\u00f4\u017eeme posun\u00fa\u0165 e\u0161te vy\u0161\u0161ie \u2014 do vesm\u00edru. V ktorom s\u00fa pre n\u00e1s zauj\u00edmav\u00e9 meteorick\u00e9 satelity NOAA 15<\/a><\/noindex>, NOAA 18<\/a><\/noindex> a NOAA 19<\/a><\/noindex>, ktor\u00e9 pren\u00e1\u0161aj\u00fa obrazy povrchu Zeme na frekvenci\u00e1ch 137,620, 137,9125 a 137,100 MHz. Sign\u00e1l je mo\u017en\u00e9 dek\u00f3dova\u0165 pomocou programu WXtoImg<\/a><\/noindex>.<\/p>\n

Prijat\u00fd obr\u00e1zok m\u00f4\u017ee vyzera\u0165 pribli\u017ene takto (foto zo str\u00e1nky radioscanner):<\/p>\n

\"\u010co
\n
\n\u017dia\u013e, (fyzik\u00e1lnym z\u00e1konom sa nevyhneme, a Zem je predsa len gu\u013eat\u00e1, aj ke\u010f v to nie v\u0161etci veria), sign\u00e1l satelitu m\u00f4\u017eeme prija\u0165 len vtedy, ke\u010f prelietava nad nami, a nie v\u017edy s\u00fa tieto prelety v pohodlnom \u010dase a uhle nad horizontom. Predt\u00fdm bolo potrebn\u00e9 na zistenie \u010dasu a d\u00e1tumu najbli\u017e\u0161ieho preletu nain\u0161talova\u0165 program Orbitron<\/a><\/noindex> (program, ktor\u00fd existuje u\u017e od roku 2001), teraz je to jednoduch\u0161ie urobi\u0165 online prostredn\u00edctvom odkazov https:\/\/www.n2yo.com\/passes\/?s=25338<\/a><\/noindex>, https:\/\/www.n2yo.com\/passes\/?s=28654<\/a><\/noindex> a https:\/\/www.n2yo.com\/passes\/?s=33591<\/a><\/noindex> pr\u00edpadne. <\/p>\n

Sign\u00e1l satelitov je dos\u0165 siln\u00fd a je po\u010du\u0165 takmer na ak\u00fako\u013evek ant\u00e9nu a ak\u00fdko\u013evek prij\u00edma\u010d. Av\u0161ak, aby sme prijali obr\u00e1zok v dobrej kvalite, je st\u00e1le \u017eiaduce ma\u0165 \u0161peci\u00e1lnu ant\u00e9nu a dobr\u00fd v\u00fdh\u013ead na horizont. Z\u00e1ujemcovia si m\u00f4\u017eu pozrie\u0165 anglick\u00fd tutori\u00e1l na youtube<\/a><\/noindex> alebo si pre\u010d\u00edta\u0165 podrobn\u00e9 op\u00edsanie<\/a><\/noindex>. Osobne som nemal trpezlivos\u0165 dokon\u010di\u0165 to, ale in\u00ed m\u00f4\u017eu ma\u0165 v\u00e4\u010d\u0161ie \u0161\u0165astie.<\/p>\n

Pagingov\u00e9 spr\u00e1vy FLEX\/POCSAG<\/h2>\n

\nNeviem, \u010di e\u0161te funguje pagingov\u00e1 komunik\u00e1cia pre firemn\u00fdch klientov v Rusku, ale v Eur\u00f3pe funguje celkom dobre, pou\u017e\u00edvaj\u00fa ju hasi\u010di, pol\u00edcia a r\u00f4zne slu\u017eby. <\/p>\n

Sign\u00e1ly FLEX a POCSAG je mo\u017en\u00e9 prij\u00edma\u0165 pomocou HDSDR a Virtual Audio Cable, na dek\u00f3dovanie sa pou\u017e\u00edva program PDW<\/a><\/noindex>. Bol nap\u00edsan\u00fd u\u017e v roku 2004 a rozhranie m\u00e1 zodpovedaj\u00face tomu, ale akosi st\u00e1le celkom funguje.<\/p>\n

\"\u010co
\n
\nExistuje aj dekod\u00e9r multimon-ng, ktor\u00fd funguje pod Linuxom, jeho zdrojov\u00e9 k\u00f3dy s\u00fa dostupn\u00e9 na github<\/a><\/noindex>. O protokole prenosu POCSAG existoval tie\u017e samostatn\u00fd \u010dl\u00e1nok, z\u00e1ujemcovia sa s n\u00edm m\u00f4\u017eu zozn\u00e1mi\u0165 podrobnej\u0161ie<\/a><\/noindex>.<\/p>\n

K\u013e\u00fa\u010de\/bezdr\u00f4tov\u00e9 vyp\u00edna\u010de<\/h2>\n

\nE\u0161te vy\u0161\u0161ie v p\u00e1sme, na 433 MHz, sa nach\u00e1dza cel\u00e1 rada r\u00f4znych zariaden\u00ed \u2014 bezdr\u00f4tov\u00e9 vyp\u00edna\u010de a z\u00e1suvky, zvon\u010deky, senzory tlaku pneumat\u00edk \u00e1ut a pod. <\/p>\n

\"\u010co
\n
\nToto s\u00fa \u010dasto lacn\u00e9 \u010d\u00ednske zariadenia s najjednoduch\u0161ou modul\u00e1ciou. Neexistuje \u017eiadne \u0161ifrovanie a pou\u017e\u00edva sa jednoduch\u00fd bin\u00e1rny k\u00f3d (OOK \u2014 on-off keying). Dek\u00f3dovanie tak\u00fdchto sign\u00e1lov bolo prerokovan\u00e9 v samostatnom \u010dl\u00e1nku<\/a><\/noindex>. M\u00f4\u017eeme vyu\u017ei\u0165 existuj\u00faci dekod\u00e9r rtl_433, ktor\u00fd si m\u00f4\u017eeme stiahnu\u0165 odtia\u013eto<\/a><\/noindex>. <\/p>\n

\"\u010co
\n
\nSpusten\u00edm programu m\u00f4\u017eete vidie\u0165 r\u00f4zne zariadenia a (ak je v bl\u00edzkosti parkovisko) zisti\u0165 napr\u00edklad tlak v pneumatik\u00e1ch susedovho auta. Praktick\u00e9ho zmyslu v tom nie je ve\u013ea, ale z \u010disto matematick\u00e9ho h\u013eadiska je to celkom zauj\u00edmav\u00e9 \u2014 protokoly t\u00fdchto sign\u00e1lov s\u00fa jednoduch\u00e9 na dek\u00f3dovanie.<\/p>\n

Mimochodom, kupuj\u00faci tak\u00e9 bezdr\u00f4tov\u00e9 vyp\u00edna\u010de by mali ma\u0165 na pam\u00e4ti, \u017ee nie s\u00fa nijako chr\u00e1nen\u00e9, a teoreticky v\u00e1\u0161 hacker-sused, ak m\u00e1 HackRF alebo podobn\u00e9 zariadenie, v\u00e1m m\u00f4\u017ee v najnevhodnej\u0161om momente zlomyse\u013ene vypn\u00fa\u0165 svetlo na toalete alebo vykona\u0165 nie\u010do podobn\u00e9. Osobne sa s t\u00fdm nezapodievam, ale ak je ot\u00e1zka bezpe\u010dnosti aktu\u00e1lna, m\u00f4\u017eete pou\u017ei\u0165 seri\u00f3znej\u0161ie a drah\u0161ie zariadenia s plnohodnotn\u00fdmi k\u013e\u00fa\u010dmi a autentifik\u00e1ciou (Z-Wave, Philips Hue a pod.).<\/p>\n

TETRA<\/h2>\n

\nTETRA<\/a><\/noindex> (Terrestrial Trunked Radio) \u2014 je profesion\u00e1lny syst\u00e9m podnikovej r\u00e1diovej komunik\u00e1cie s dostato\u010dne ve\u013ek\u00fdmi mo\u017enos\u0165ami (skupinov\u00e9 v\u00fdskyty, \u0161ifrovanie, zlu\u010dovanie nieko\u013ek\u00fdch siet\u00ed a pod.). A jej sign\u00e1ly, ak nie s\u00fa za\u0161ifrovan\u00e9, je tie\u017e mo\u017en\u00e9 prij\u00edma\u0165 s po\u010d\u00edta\u010dom a SDR prij\u00edma\u010dom.<\/p>\n

Dekod\u00e9r TETRA pre Linux existoval u\u017e dos\u0165 d\u00e1vno<\/a><\/noindex>, ale jeho nastavenie bolo \u010faleko od trivi\u00e1lneho a asi pred rokom rusk\u00fd program\u00e1tor vytvoril plugin pre prij\u00edmanie TETRA<\/a><\/noindex> pre SDR#. Teraz sa t\u00e1to \u00faloha rie\u0161i takmer doslova v dvoch kliknutiach, program umo\u017e\u0148uje zobrazova\u0165 inform\u00e1cie o syst\u00e9me, po\u010d\u00fava\u0165 hlasov\u00e9 spr\u00e1vy, zhroma\u017e\u010fova\u0165 \u0161tatistiky a pod.<\/p>\n

\"\u010co
\n
\nPlugin nezah\u0155\u0148a v\u0161etky mo\u017enosti \u0161tandardu, ale z\u00e1kladn\u00e9 funkcie funguj\u00fa viac-menej.<\/p>\n

Pod\u013ea Wikip\u00e9die m\u00f4\u017ee by\u0165 TETRA pou\u017e\u00edvan\u00e1 v sanitk\u00e1ch, pol\u00edci\u00ed, na \u017eelezni\u010dnej doprave a pod. O jej roz\u0161\u00edren\u00ed v Rusku nem\u00e1m inform\u00e1cie (zrejme sa sie\u0165 TETRA pou\u017e\u00edvala na MS2018, ale to nie je presn\u00e9), zauj\u00edmav\u00ed si m\u00f4\u017eu skontrolova\u0165 sami \u2014 sign\u00e1ly TETRA s\u00fa \u013eahko rozpoznate\u013en\u00e9 a maj\u00fa \u0161\u00edrku 25 kHz, ako je vidie\u0165 na sn\u00edmke obrazovky. <\/p>\n

Samozrejme, ak je v sieti zapnut\u00e9 \u0161ifrovanie (t\u00e1to mo\u017enos\u0165 je v Tetre dostupn\u00e1), plugin nebude fungova\u0165 \u2014 namiesto re\u010di bude len \u201ebublanie\u201c.<\/p>\n

ADSB<\/h2>\n

\nPosunieme sa e\u0161te vy\u0161\u0161ie na frekvencii 1.09 GHz, kde sa pren\u00e1\u0161aj\u00fa sign\u00e1ly transpond\u00e9rov lietadiel, \u010do umo\u017e\u0148uje tak\u00fdm webom ako FlightRadar24 zobrazova\u0165 prelietaj\u00face lietadl\u00e1. Tento protokol bol u\u017e predt\u00fdm rozoberan\u00fd, tak\u017ee sa tu nebudem opakova\u0165 (\u010dl\u00e1nok je aj tak dos\u0165 dlh\u00fd), z\u00e1ujemcovia si m\u00f4\u017eu pre\u010d\u00edta\u0165 prv\u00fa<\/a><\/noindex> a druh\u00fa<\/a><\/noindex> \u010dasti.<\/p>\n

Z\u00e1ver<\/h2>\n

\nAko vid\u00edte, aj s prij\u00edma\u010dom za 30 dol\u00e1rov m\u00f4\u017eete n\u00e1js\u0165 vo vzduchu ve\u013ea zauj\u00edmav\u00e9ho. Som si ist\u00fd, \u017ee tu je uveden\u00fdch \u010faleko nie v\u0161etko a \u017ee som nie\u010do ur\u010dite vynechal alebo neviem. Z\u00e1ujemcovia m\u00f4\u017eu vysk\u00fa\u0161a\u0165 sami \u2014 je to dobr\u00fd sp\u00f4sob, ako sa lep\u0161ie obozn\u00e1mi\u0165 s princ\u00edpom fungovania r\u00f4znych syst\u00e9mov.<\/p>\n

Amat\u00e9rsku r\u00e1diov\u00fa komunik\u00e1ciu som nezv\u00e1\u017eil, aj ke\u010f na VHF je tie\u017e pr\u00edtomn\u00e1, ale \u010dl\u00e1nok je predsa len o slu\u017eobnej komunik\u00e1cii.<\/p>\n

P.S.: \u0160peci\u00e1lne pre koolhackers<\/a><\/noindex> je mo\u017en\u00e9 poznamena\u0165, \u017ee ni\u010d naozaj tajn\u00e9 sa vo vo\u013enom \u00e9teri u\u017e pravdepodobne minim\u00e1lne 50 rokov neprezentuje, tak\u017ee z \u201etohto\u201c h\u013eadiska nestoj\u00ed za to m\u00ed\u0148a\u0165 \u010das a peniaze. Ale z h\u013eadiska \u0161t\u00fadia princ\u00edpov komunik\u00e1cie a r\u00f4znych in\u017einierskych syst\u00e9mov je obozn\u00e1menie sa s re\u00e1lnou pr\u00e1cou skuto\u010dn\u00fdch siet\u00ed celkom zauj\u00edmav\u00e9 a pou\u010dn\u00e9.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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