{"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\/et\/blog\/administrirovanie\/chto-slyshno-v-radioefire-prinimaem-i-dekodiruem-naibolee-interesnye-signaly-chast-2-ukv","title":{"rendered":"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere, Habr.<\/p>\n<p>V <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450534\/\">esimeses osas<\/a><\/noindex> On kirjeldatud m\u00f5ningaid signaale, mida saab vastu v\u00f5tta pikkadel ja l\u00fchikestel lainetel. \u00dcsna huvitav on ka UKV-sagedusala, kus leidub samuti midagi huvitavat.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/07002c58962c751234675239f7428c33.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nNagu esimeses osas, k\u00e4sitleme signaale, mida saab arvuti abil iseseisvalt dekodeerida. Neile, keda huvitab, kuidas see t\u00f6\u00f6tab, on j\u00e4tk allpool.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nEsimeses osas kasutasime hollandi <noindex><a rel=\"nofollow\" href=\"http:\/\/websdr.ewi.utwente.nl:8901\/\">veebi vastuv\u00f5tjat<\/a><\/noindex> pikkade ja l\u00fchikeste lainete vastuv\u00f5tmiseks. Kahjuks ei ole UKV-le sarnaseid teenuseid \u2013 sageduste vahemik on liiga suur. Seet\u00f5ttu peavad need, kes soovivad allpool kirjeldatud eksperimente korrata, soetama endale oma vastuv\u00f5tja; odavaimate seas v\u00f5ib m\u00e4rkida <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rtl-sdr.com\/wp-content\/uploads\/2018\/02\/RTL-SDR-Blog-V3-Datasheet.pdf\">RTL SDR V3<\/a><\/noindex>, mille hind on umbes 30 dollarit. Selline vastuv\u00f5tja katab vahemiku kuni 1.7GHz, k\u00f5ik allpool kirjeldatud signaalid on just temaga vastu v\u00f5etud. <\/p>\n<p>Nii et alustame. Nagu esimeses osas, vaatleme signaale sageduse t\u00f5usva j\u00e4rjestuse j\u00e4rgi.<\/p>\n<h2>FM-raadio<\/h2>\n<p>\nLihtsalt FM-raadio ei \u00fcllata kedagi, kuid meid huvitab RDS. RDS (Radio Data System) olemasolu tagab digitaalsete andmete edastamise FM-signali \"sisemuses\". FM-jaama signaali spekter demoduleerimise j\u00e4rel n\u00e4eb v\u00e4lja selline:<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/47dcf140dffda67ddc71c0a0211c3caf.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n19 kHz sagedusel asub piloottoon, ja selle kolmekordsel sagedusel 57 kHz edastatakse RDS-signaal. Osillogrammil, kui lisada m\u00f5lemad signaalid kokku, n\u00e4eb see v\u00e4lja umbes selline:<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/beae4480f5b7e1ab3d223d379b26482f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nFaasimodulatsiooni abil on siin kodeeritud madalsageduslik signaal sagedusega 1187,5 Hz (muide, sagedus 1187,5 Hz ei ole ka juhuslik \u2014 see on 19 kHz piloottooni sagedus jagatud 16-ga). Edasi, p\u00e4rast bitiviisilist dekodeerimist, dekodeeritakse andmepaketid, mille t\u00fc\u00fcpe on \u00fcsna palju \u2014 lisaks tekstile v\u00f5ivad edastada n\u00e4iteks alternatiivseid raadiosaatjate sagedusi ja piirkonda sisenedes v\u00f5ib vastuv\u00f5tja automaatselt uuele sagedusele \u00fclemineku teha. <\/p>\n<p>Kohalikest raadiojaamadest RDS-andmete vastuv\u00f5tmiseks on v\u00f5imalik kasutada programmi <noindex><a rel=\"nofollow\" href=\"http:\/\/rdsspy.com\/downloads\/\">RDS Spy<\/a><\/noindex>. Seda saab \u00fchendada HDSDR-iga, kui valida FM-modulatsioon, signaali laius 120 kHz ja bitikiirus 192 kHz, nagu on n\u00e4idatud joonisel.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/22b0df17bcb4e8abbea55c66cc5bf2b3.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiis piisab signaali suunamisest Virtual Audio Cable'i kaudu HDSDR-ist RDS Spy'sse (VAC seadistustes tuleb samuti m\u00e4\u00e4rata bitikiirus 192 kHz). Kui k\u00f5ik on \u00f5igesti tehtud, n\u00e4eme RDS-i kohta palju rohkem teavet, kui tavaline kodu raadio.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/742b3706c8130cffce9125802a0253e9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLisaks FM-ile, muide, on v\u00f5imalik dekodeerida ka DAB+, selle kohta oli <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/448244\/\">eraldi artikkel<\/a><\/noindex>. Venemaal ei t\u00f6\u00f6ta see praegu, kuid teistes riikides v\u00f5ib see olla aktuaalne.<\/p>\n<h2>Lennundusvahemik<\/h2>\n<p>\nAjalooliselt on lennunduses kasutusel amplituudimodulatsioon (AM) ja sagedusvahemik 118-137 MHz. Pilootide ja dispetcherite l\u00e4bir\u00e4\u00e4kimised ei ole mingil moel kr\u00fcpteeritud ning neid v\u00f5ib kuulata iga soovija. 20 aastat tagasi \"t\u00f5mmati\" selleks tavaliselt odavad Hiina raadiovastuv\u00f5tjad \u2014 piisab, kui k\u00e4rpida heterod\u00fc\u00fcni spiraalid ja sagedus nihkub, kui \u00f5nneks l\u00e4heb, siis k\u00f5rgemate sageduste suunas. Need, kes huvituvad \"digitaalsetest arheoloogiatest\", v\u00f5ivad lugeda arutelu <noindex><a rel=\"nofollow\" href=\"http:\/\/www.radioscanner.ru\/forum\/topic13565.html\">forumi radioscanner<\/a><\/noindex> 2004. Aja Hiina tootjad tulid kasutajate vastu ja lisasid lihtsalt Air vahemiku vastuv\u00f5tjatele (esimese osa kommentaarides soovitati Tecsun PL-660 v\u00f5i PL-680). Kuid loomulikult on spetsialiseeritud seadmete kasutamine (nt AOR ja Icom vastuv\u00f5tjad) oluliselt eelistatud \u2014 need on varustatud m\u00fcra v\u00e4hendamise funktsiooniga (heli l\u00fclitatakse v\u00e4lja, kui signaali pole ja pidevat kr\u00f5binat ei kuule) ning neid iseloomustab kiirem sageduste otsimise kiirus.<\/p>\n<p>Iga suur lennujaam kasutab \u00fcsna palju sagedusi, n\u00e4iteks Pulkovo lennujaama sagedused, mis on saadud lehelt radioscanner:<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/c1b79780a12362f182b215d7dc5117e8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMuide, erinevate Venemaa linnade (Moskva, S-Pb, \u010celjabinsk ja m\u00f5ned teised) l\u00e4bir\u00e4\u00e4kimiste edastusi saab kuulata otse veebis <noindex><a rel=\"nofollow\" href=\"http:\/\/live.radioscanner.net\/\">http:\/\/live.radioscanner.net<\/a><\/noindex>. <\/p>\n<p>Meie jaoks lennujuhtimisvahemikus on huvitav digitaalne protokoll <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/ACARS\">ACARS<\/a><\/noindex> (Aircraft Communications Addressing and Reporting System). Selle signaalid edastatakse sagedustel 131.525 ja 131.725 MHz (Euroopa standard, erinevate piirkondade sagedused <noindex><a rel=\"nofollow\" href=\"https:\/\/www.acarsd.org\/ACARS_frequencies.html\">v\u00f5ivad erineda<\/a><\/noindex>). Need on digitaalne paketid bitikiirusel 2400 v\u00f5i 1200 bps, mille abil saavad piloodid s\u00f5numit vahetada dispet\u0161eriga. MultiPSK-s dekodeerimiseks tuleb h\u00e4\u00e4lestuda AM-re\u017eiimis signaalile (vajalik on SDR-vastuv\u00f5tja, kuna signaali ribalaius \u00fcletab 5 kHz) ja suunata heli Virtual Audio Card'i kaudu. <\/p>\n<p>Tulemus on n\u00e4idatud ekraanipildil.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/6a4bf480d2f932cddbb9c4935c488f73.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nACARS signaalide formaat on suhteliselt lihtne ja selle saab vaadata SA Free programmis. Selleks on piisav avada salvestuse fragment ning n\u00e4ha, et AM salvestuse 'sees' on tegelikult sagedusmodulatsioon.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/6de57323223f2e4eac8328ac77563c0f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEdasi liikudes, rakendades salvestusele sagedusdetektori, saame kergesti bitivoo k\u00e4tte. Tegelikkuses ei ole t\u00f5en\u00e4oliselt vajalik seda teha, kuna ACARS dekodeerimiseks on ammu olemas valmis programmid.<\/p>\n<h2>Meteorsatelliidid NOAA<\/h2>\n<p>\nKuulates lennukite vestlusi, saab ulatuda veel k\u00f5rgemale - kosmosesse. Kus meie jaoks on huvitavad meteorsatelliidid <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/NOAA-15\">NOAA 15<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/NOAA-18\">NOAA 18<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/NOAA-19\">NOAA 19<\/a><\/noindex>, mis edastavad maapinna pilte sagedustel 137.620, 137.9125 ja 137.100 MHz. Signaali dekodeerida saab programmi abil <noindex><a rel=\"nofollow\" href=\"https:\/\/wxtoimgrestored.xyz\/downloads\/\">WXtoImg<\/a><\/noindex>.<\/p>\n<p>Vastuv\u00f5etud pilt v\u00f5ib v\u00e4lja n\u00e4ha umbes selline (foto saidilt radioscanner):<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/5987ac91e7333d37a04be18e34117e36.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKahjuks (f\u00fc\u00fcsikaseadusi ei saa petta ja maakera on t\u00f5epoolest \u00fcmmargune, kuigi mitte k\u00f5ik ei usu sellesse) saab satelliidisignaali vastu v\u00f5tta ainult siis, kui see lendab meie kohal, ja mitte alati juhtub see sobival ajal ja horisondiga sobivas nurgas. Varem, et teada saada j\u00e4rgmise lendu kuup\u00e4eva ja kellaaega, tuli installida programm <noindex><a rel=\"nofollow\" href=\"http:\/\/www.stoff.pl\/\">Orbitron<\/a><\/noindex> (pikkade traditsioonidega programm, mis on eksisteerinud alates 2001. aastast), praegu on seda lihtsam teha veebis linkide kaudu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.n2yo.com\/passes\/?s=25338\">https:\/\/www.n2yo.com\/passes\/?s=25338<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.n2yo.com\/passes\/?s=28654\">https:\/\/www.n2yo.com\/passes\/?s=28654<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.n2yo.com\/passes\/?s=33591\">https:\/\/www.n2yo.com\/passes\/?s=33591<\/a><\/noindex> vastavalt. <\/p>\n<p>Satelliidisignaal on \u00fcsna vali ja kuuldav peaaegu igasugustele antennidele ja vastuv\u00f5tjatele. Kuid et saada head kvaliteeti pildist, on siiski soovitatav kasutada spetsiaalset antenni ja head horisondi \u00fclevaadet. Huvi korral saavad inimesed vaadata <noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/0efTTWMl3v0?t=19\">ingliskeelset juhendit YouTube'is<\/a><\/noindex> v\u00f5i lugeda <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rtl-sdr.com\/rtl-sdr-tutorial-receiving-noaa-weather-satellite-images\/\">detailset kirjeldust<\/a><\/noindex>. Isiklikult ei j\u00e4tkunud mul kannatust asja l\u00f5puni viia, kuid teistel v\u00f5ib-olla l\u00e4heb paremini.<\/p>\n<h2>Pagingu s\u00f5numid FLEX\/POCSAG<\/h2>\n<p>\nKas p\u00fcsiv toalett\u00fchendus ettev\u00f5tte klientidele Venemaal veel t\u00f6\u00f6tab, ei tea, aga Euroopas toimib see t\u00e4ielikult, seda kasutavad p\u00e4\u00e4steteenistused, politsei ja erinevad teenistused. <\/p>\n<p>FLEX ja POCSAG signaale saab vastu v\u00f5tta HDSDR-i ja Virtual Audio Cable'i abil, dekodeerimiseks kasutatakse programmi <noindex><a rel=\"nofollow\" href=\"https:\/\/www.discriminator.nl\/pdw\/\">PDW<\/a><\/noindex>. See kirjutati juba 2004. aastal, ja liides on vastav, kuid kummaliselt t\u00f6\u00f6tab see endiselt \u00fcsna h\u00e4sti.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/42bee0f2a5b253d94dbc1489c9f972e1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSamuti on olemas dekooder multimon-ng, mis t\u00f6\u00f6tab Linuxis, ning selle l\u00e4htekood on saadaval <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/EliasOenal\/multimon-ng\">github'is<\/a><\/noindex>. POCSAG edastusprotokollist oli samuti eraldi artikkel, huvilised saavad sellega tutvuda <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/438602\/\">s\u00fcvitsi<\/a><\/noindex>.<\/p>\n<h2>Puldid \/ juhtmevabad l\u00fclitid<\/h2>\n<p>\nVeelgi k\u00f5rgemal sagedusel, 433 MHz, leidub suur hulk erinevaid seadmeid - juhtmevabad l\u00fclitid ja pistikud, uksekellad, auto rehvi r\u00f5huandurid jne. <\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/eab3a22484e00ff9f42a51cadeba1265.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNeed on tihti odavad hiina seadmed lihtsa modulaatoriga. Seal ei ole mingit kr\u00fcpteerimist, kasutatakse lihtsat binaarkoodi (OOK - on-off keying). Selliste signaalide dekodeerimist k\u00e4sitletakse <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/414285\/\">eraldiseisvas artiklis<\/a><\/noindex>. Me saame kasutada valmis dekooderit rtl_433, mille saab alla laadida <noindex><a rel=\"nofollow\" href=\"https:\/\/cognito.me.uk\/computers\/rtl_433-windows-binary-32-bit\/\">siit<\/a><\/noindex>. <\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/020c4302a1ffe5d609eef949e19f304d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nProgrammi k\u00e4ivitamisel on n\u00e4ha erinevaid seadmeid ja (kui parkla on l\u00e4hedal) saab n\u00e4iteks teada naabri auto rehvir\u00f5hku. Praktikas ei ole sel selget m\u00f5istet, kuid puhtalt matemaatilisest vaatepunktist on see t\u00e4iesti huvitav \u2014 nende signaalide protokolle on lihtne dekodeerida.<\/p>\n<p>\u00dcksikasjana peaksid selliseid traadita l\u00fcliteid ostjad meeles pidama, et need pole millegi vastu kaitstud. Teoreetiliselt v\u00f5ib teie h\u00e4kker-naaber, omades HackRF v\u00f5i sarnast seadet, j\u00f5hkralt teie tualeti valgust v\u00e4lja l\u00fclitada k\u00f5ige v\u00e4hem sobival hetkel v\u00f5i teha midagi sarnast. Isiklikult ei muretse ma selle \u00fcle, aga kui turvak\u00fcsimus on aktuaalne, siis v\u00f5ib kasutada t\u00f5sisemaid ja kallimaid seadmeid, mis sisaldavad t\u00e4ielikke v\u00f5tmeid ja autentimist (Z-Wave, Philips Hue jne).<\/p>\n<h2>TETRA<\/h2>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/TETRA\">TETRA<\/a><\/noindex> (Maapealne trunkeraadio) \u2014 see on professionaalne ettev\u00f5tte raadioside s\u00fcsteem, millel on piisavalt suured v\u00f5imalused (grupik\u00f5ned, kr\u00fcptimine, mitme v\u00f5rgu \u00fchendamine jne). Ja selle signaale, kui need pole kr\u00fcptitud, saab samuti vastu v\u00f5tta arvuti ja SDR-vastuv\u00f5tja abil.<\/p>\n<p>TETRA dekooder Linuxile eksisteeris <noindex><a rel=\"nofollow\" href=\"https:\/\/osmocom.org\/projects\/tetra\/wiki\/OsmocomTETRA\">p\u00e4ris kaua aega tagasi<\/a><\/noindex>, kuid selle seadistamine ei olnud sugugi lihtne, ja umbes aasta tagasi l\u00f5i Venemaa arendaja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rtl-sdr.com\/sdr-tetra-plugin-now-available-at-rtl-sdr-ru\/\">TETRA vastuv\u00f5tmiseks plugina<\/a><\/noindex> SDR# jaoks. N\u00fc\u00fcd saab selle \u00fclesande lahendada peaaegu s\u00f5na otseses m\u00f5ttes kahe kl\u00f5psuga; programm v\u00f5imaldab s\u00fcsteemi teavet kuvada, heli s\u00f5numeid kuulata, statistikat koguda ja palju muud.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on raadiosaatmiseks? Vastuv\u00f5tame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, UKV\" src=\"\/wp-content\/uploads\/2019\/05\/c6ecdd05402b9f420acde1cfd0cec51b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPlugin ei rakenda k\u00f5iki standardi v\u00f5imalusi, kuid p\u00f5hifunktsioonid t\u00f6\u00f6tavad enam-v\u00e4hem.<\/p>\n<p>Vikipeedia kohaselt kasutatakse TETRA-d kiirabis, politseis, raudteetranspordis jne. Mis puudutab selle levikut Venemaal, siis ma ei tea (n\u00e4ib, et TETRA v\u00f5rgustikku kasutati MM2018-l, kuid see pole kindel); soovijad saavad ise kontrollida \u2014 TETRA signaalid on kergesti tunnustatavad ja nende laius on 25 kHz, nagu n\u00e4ha ekraanipildilt. <\/p>\n<p>Muidugi, kui v\u00f5rgus on aktiveeritud kr\u00fcpteerimine (selline v\u00f5imalus TETRA-s on), siis plugin ei t\u00f6\u00f6ta \u2014 heli asemel on vaid 'm\u00fcrin'.<\/p>\n<h2>ADSB<\/h2>\n<p>\nT\u00f5usame veel k\u00f5rgemale sagedusele, kus 1.09GHz sagedusel edastatakse lennukite transponderite signaale, mis v\u00f5imaldab sellistel saitidel nagu FlightRadar24 kuvada lendavaid lennukeid. Seda protokolli on varem k\u00e4sitletud, seega ei hakka ma siin kordama (artikkel on nii v\u00f5i naa juba pikk), huvilised v\u00f5ivad lugeda. <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/408003\/\">esimene<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/443498\/\">teine<\/a><\/noindex> osa.<\/p>\n<h2>Kokkuv\u00f5te<\/h2>\n<p>\nNagu n\u00e4ha, isegi 30 dollari eest olev vastuv\u00f5tja suudab eetris leida palju huvitavat. Olen kindel, et siin loetletud pole kaugeltki k\u00f5ik ja v\u00f5ib-olla olen midagi t\u00e4helepanuta j\u00e4tnud v\u00f5i ei tea. Huvi tundjatel on v\u00f5imalus ise proovida \u2014 see on hea viis m\u00f5ista, kuidas erinevad s\u00fcsteemid t\u00f6\u00f6tavad.<\/p>\n<p>Huvitavat raadiokommunikatsiooni ma ei k\u00e4sitlenud, kuigi see on olemas ka UHF-l, kuid artikkel k\u00e4sitleb siiski ametlikku suhtlust.<\/p>\n<p>P.S.: Eriti <noindex><a rel=\"nofollow\" href=\"http:\/\/lurkmore.to\/%D0%9A%D1%83%D0%BB%D1%85%D0%B0%D1%86%D0%BA%D0%B5%D1%80\">kooli hacks<\/a><\/noindex> v\u00f5ib m\u00e4rkida, et midagi t\u00f5eliselt salajast ei edastata avatud eetris t\u00f5en\u00e4oliselt juba 50 aastat, seega ei tasu sellelt seisukohalt aega ja raha raisata. Kuid side ja erinevate inseneris\u00fcsteemide p\u00f5him\u00f5tete uurimine ning reaalsete v\u00f5rkude t\u00f5elise t\u00f6\u00f6ga tutvumine on kindlasti huvitav ja hariv.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450578\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440. \u0412 \u043f\u0435\u0440\u0432\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u0431\u044b\u043b\u0438 \u043e\u043f\u0438\u0441\u0430\u043d\u044b \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0438\u0433\u043d\u0430\u043b\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u0438\u043d\u044f\u0442\u044c \u043d\u0430 \u0434\u043b\u0438\u043d\u043d\u044b\u0445 \u0438 \u043a\u043e\u0440\u043e\u0442\u043a\u0438\u0445 \u0432\u043e\u043b\u043d\u0430\u0445. \u041d\u0435 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\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430. \u041a\u043e\u043c\u0443 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e, \u043a\u0430\u043a \u044d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0438\u0435 \u043f\u043e\u0434 \u043a\u0430\u0442\u043e\u043c. \u0412 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":24864,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440. \u0412 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Vaatame ja dekodeerime k\u00f5ige huvitavamaid signaale. Osa 2, FM | ProHoster","description":"Tere, Habr. Esimeses osas kirjeldati m\u00f5ningaid signaale, mis v\u00f5ivad j\u00f5uda pikkade ja l\u00fchikeste lainetena. Mitte v\u00e4hem huvitav on FM-sagedusala, kus on samuti v\u00f5imalik leida midagi p\u00f5nevat. Nagu esimeses osas, k\u00e4sitletakse ka m\u00e4rke, mida saab arvuti abil ise dekr\u00fcpteerida. 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