{"id":33422,"date":"2019-10-31T21:52:29","date_gmt":"2019-10-31T18:52:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chto-slyshno-v-radioefire-radiolyubiteli-ham-radio\/"},"modified":"2019-10-31T21:52:29","modified_gmt":"2019-10-31T18:52:29","slug":"chto-slyshno-v-radioefire-radiolyubiteli-ham-radio","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/chto-slyshno-v-radioefire-radiolyubiteli-ham-radio","title":{"rendered":"Co se \u0159\u00edk\u00e1 v r\u00e1diov\u00e9m \u00e9teru? R\u00e1diov\u00ed amat\u00e9\u0159i \/ Ham radio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ahoj Habr.<\/p>\n

V prvn\u00ed \u010d\u00e1sti \u010dl\u00e1nku o tom co se \u0161\u00ed\u0159\u00ed v \u00e9teru<\/a><\/noindex> bylo \u0159e\u010deno o slu\u017eebn\u00edch stanic\u00edch na dlouh\u00fdch a kr\u00e1tk\u00fdch vln\u00e1ch. Zvl\u00e1\u0161\u0165 stoj\u00ed za zm\u00ednku amat\u00e9rsk\u00e9 stanice. Za prv\u00e9, to je tak\u00e9 zaj\u00edmav\u00e9, a za druh\u00e9, k tomuto procesu, jak na p\u0159\u00edjem, tak na p\u0159enos, se m\u016f\u017ee p\u0159ipojit ka\u017ed\u00fd z\u00e1jemce.<\/p>\n

\"Co
\n
\nJak je tomu i v prvn\u00edch \u010d\u00e1stech, d\u016fraz bude kladen na 'digit\u00e1ln\u00ed' a na to, jak je zpracov\u00e1n\u00ed sign\u00e1l\u016f uspo\u0159\u00e1d\u00e1no. Pro p\u0159\u00edjem a dek\u00f3dov\u00e1n\u00ed sign\u00e1l\u016f budeme tak\u00e9 pou\u017e\u00edvat nizozemsk\u00fd online p\u0159ij\u00edma\u010d websdr<\/a><\/noindex> a program MultiPSK.<\/p>\n

Pro ty, kter\u00e9 zaj\u00edm\u00e1, jak to funguje, pokra\u010dov\u00e1n\u00ed naleznete pod perexem.<\/a><\/noindex><\/p>\n

Po v\u00edce ne\u017e 100 letech, co bylo zn\u00e1mo, \u017ee na kr\u00e1tk\u00fdch vln\u00e1ch je mo\u017en\u00e9 se spojit s cel\u00fdm sv\u011btem pomoc\u00ed vys\u00edla\u010de prakticky ze dvou lamp, se t\u00edmto procesem za\u010daly zaj\u00edmat nejen korporace, ale i nad\u0161enci. V t\u011bch letech to vypadalo p\u0159ibli\u017en\u011b takto<\/a><\/noindex>, a dodnes z\u016fst\u00e1v\u00e1 amat\u00e9rsk\u00e9 r\u00e1dio zaj\u00edmav\u00fdm technick\u00fdm hobby. Jak\u00e9 typy spojen\u00ed jsou dne\u0161n\u00edm amat\u00e9r\u016fm k dispozici, pokus\u00edme se zjistit.<\/p>\n

Frekven\u010dn\u00ed p\u00e1sma<\/h2>\n

\nR\u00e1diov\u00fd \u00e9ter je velmi aktivn\u011b vyu\u017e\u00edv\u00e1n slu\u017eebn\u00edmi a vys\u00edlac\u00edmi stanicemi, proto amat\u00e9r\u016fm byla p\u0159id\u011blena ur\u010dit\u00e9 frekven\u010dn\u00ed p\u00e1sma, aby neru\u0161ili ostatn\u00ed. T\u011bchto p\u00e1sem je pom\u011brn\u011b hodn\u011b, od superdlouh\u00fdch vln na 137 kHz po mikrovlny na 1,3, 2,4, 5,6 nebo 10 GHz (podrobn\u011bji se daj\u00ed prohl\u00e9dnout zde<\/a><\/noindex>). Obecn\u011b si ka\u017ed\u00fd m\u016f\u017ee vybrat v z\u00e1vislosti na z\u00e1jmech a technick\u00e9m vybaven\u00ed.<\/p>\n

Z hlediska jednoduchosti p\u0159\u00edjmu jsou nejdostupn\u011bj\u0161\u00ed frekvence s d\u00e9lkou vlny 80-20 m:
\n \u2014 P\u00e1smo 3,5 MHz (80 m): 3500-3800 kHz.
\n \u2014 P\u00e1smo 7 MHz (40 m): 7000-7200 kHz.
\n \u2014 P\u00e1smo 10 MHz (30 m): 10100-10140 kHz.
\n \u2014 P\u00e1smo 14 MHz (20 m): 14000-14350 kHz.
\nNa t\u011bchto frekvenc\u00edch se lze ladit jak pomoc\u00ed v\u00fd\u0161e zm\u00edn\u011bn\u00e9ho online p\u0159ij\u00edma\u010de<\/a><\/noindex>, tak i pomoc\u00ed vlastn\u00ed, pokud m\u016f\u017ee p\u0159ij\u00edmat v re\u017eimu bo\u010dn\u00ed p\u00e1sma (LSB, USB, SSB).
\nNyn\u00ed, kdy\u017e je v\u0161e p\u0159ipraveno, pod\u00edvejme se, co tam m\u016f\u017eeme p\u0159ijmout.<\/p>\n

Hlasov\u00e1 komunikace a Morseova abeceda<\/h2>\n

\nPokud se pod\u00edv\u00e1te p\u0159es websdr na cel\u00fd amat\u00e9rsk\u00fd r\u00e1diov\u00fd p\u00e1smo, snadno uvid\u00edte sign\u00e1ly Morseovy abecedy. V slu\u017eebn\u00ed r\u00e1diov\u00e9 komunikaci se u\u017e t\u00e9m\u011b\u0159 nepou\u017e\u00edv\u00e1, ale n\u011bkte\u0159\u00ed amat\u00e9r\u0161t\u00ed nad\u0161enci ji st\u00e1le pou\u017e\u00edvaj\u00ed.
\n\"Co
\n
\nD\u0159\u00edve bylo pro z\u00edsk\u00e1n\u00ed volac\u00edho znaku dokonce nutn\u00e9 slo\u017eit zkou\u0161ku z p\u0159\u00edjmu Morseovy abecedy, nyn\u00ed toto z\u0159ejm\u011b z\u016fstalo jen pro prvn\u00ed, nejvy\u0161\u0161\u00ed kategorii (ty se li\u0161\u00ed hlavn\u011b maxim\u00e1ln\u011b povolen\u00fdm v\u00fdkonem). My budeme de\u0161ifrovat sign\u00e1ly CW pomoc\u00ed CW Skimmer a Virtual Audio Card.<\/p>\n

\"Co
\n
\nRadiosl\u00fdcha\u010di pou\u017e\u00edvaj\u00ed zkr\u00e1cen\u00fd k\u00f3d (Q-k\u00f3d<\/a><\/noindex>), konkr\u00e9tn\u011b \u0159et\u011bzec CQ DE DF7FF znamen\u00e1 obecn\u00e9 vol\u00e1n\u00ed v\u0161em stanic\u00edm od radioamat\u00e9ra DF7FF. Ka\u017ed\u00fd radioamat\u00e9r m\u00e1 sv\u016fj volac\u00ed znak, jeho\u017e prefix se tvo\u0159\u00ed z k\u00f3du zem\u011b<\/a><\/noindex>, co\u017e je dost praktick\u00e9, proto\u017ee je hned jasn\u00e9, odkud stanice vys\u00edl\u00e1. V na\u0161em p\u0159\u00edpad\u011b volac\u00ed znak DF7FF pat\u0159\u00ed radioamat\u00e9rovi z N\u011bmecka.<\/p>\n

Pokud jde o hlasovou komunikaci, s n\u00ed nejsou \u017e\u00e1dn\u00e9 slo\u017eitosti, z\u00e1jemci si mohou poslechnout sami na websdr. Kdysi za dob SSSR nem\u011bli v\u0161ichni radioamat\u00e9\u0159i pr\u00e1vo navazovat r\u00e1diov\u00e9 spojen\u00ed se zahrani\u010d\u00edm, nyn\u00ed takov\u00e1 omezen\u00ed neexistuj\u00ed, a dosah a kvalita spojen\u00ed z\u00e1vis\u00ed pouze na kvalit\u011b ant\u00e9n, za\u0159\u00edzen\u00ed a trp\u011blivosti oper\u00e1tora. Pro ty, kdo se cht\u011bj\u00ed dozv\u011bd\u011bt v\u00edce, je dobr\u00e9 si p\u0159e\u010d\u00edst na radioamat\u00e9rsk\u00fdch str\u00e1nk\u00e1ch a f\u00f3rech (cqham, qrz), my se nyn\u00ed p\u0159esuneme k digit\u00e1ln\u00edm sign\u00e1l\u016fm.<\/p>\n

Bohu\u017eel, pro mnoho radioamat\u00e9r\u016f pr\u00e1ce s \u201edigital\u201c je prost\u011b spojen\u00ed zvukov\u00e9 karty po\u010d\u00edta\u010de s dek\u00f3dovac\u00ed aplikac\u00ed, m\u00e1lokdo se zaj\u00edm\u00e1 o detaily toho, jak to funguje. Je\u0161t\u011b m\u00e9n\u011b prov\u00e1d\u00ed vlastn\u00ed experimenty s digit\u00e1ln\u00edm zpracov\u00e1n\u00edm sign\u00e1l\u016f a r\u016fzn\u00fdmi typy spojen\u00ed. I p\u0159esto, v posledn\u00edch 10\u201315 letech se objevilo pom\u011brn\u011b mnoho digit\u00e1ln\u00edch protokol\u016f, z nich\u017e n\u011bkter\u00e9 stoj\u00ed za zhl\u00e9dnut\u00ed.<\/p>\n

RTTY<\/h2>\n

\nJe to pom\u011brn\u011b star\u00fd zp\u016fsob komunikace, kter\u00fd vyu\u017e\u00edv\u00e1 frekven\u010dn\u00ed modulaci. Samotn\u00e1 metoda se naz\u00fdv\u00e1 FSK (Frequency Shift Keying) a spo\u010d\u00edv\u00e1 ve vytv\u00e1\u0159en\u00ed bitov\u00e9 sekvence zm\u011bnou frekvence p\u0159enosu. <\/p>\n

\"Co
\n
\nData jsou k\u00f3dov\u00e1na rychl\u00fdm p\u0159ep\u00edn\u00e1n\u00edm mezi dv\u011bma frekvencemi F0 a F1. Rozd\u00edl dF = F1 \u2014 F0 se naz\u00fdv\u00e1 rozestup frekvenc\u00ed a m\u016f\u017ee b\u00fdt nap\u0159\u00edklad 85, 170 nebo 452 Hz. Druh\u00fdm parametrem je rychlost p\u0159enosu, kter\u00e1 m\u016f\u017ee b\u00fdt tak\u00e9 r\u016fzn\u00e1, nap\u0159\u00edklad 45, 50 nebo 75 bit\u016f za sekundu. Vzhledem k tomu, \u017ee m\u00e1me dv\u011b frekvence, je t\u0159eba ur\u010dit, kter\u00e1 bude \u201ehorn\u00ed\u201c a kter\u00e1 \u201edoln\u00ed\u201c, tento parametr se obvykle naz\u00fdv\u00e1 \u201einverze\u201c. Tato t\u0159i hodnoty (rychlost, rozestup a inverze) pln\u011b ur\u010duj\u00ed parametry RTTY p\u0159enosu. V prakticky jak\u00fdchkoli dek\u00f3dovac\u00edch programech lze naj\u00edt tato nastaven\u00ed a spr\u00e1vn\u00fdm nastaven\u00edm, i \u201ena oko\u201c, lze dek\u00f3dovat v\u011bt\u0161inu takov\u00fdch sign\u00e1l\u016f.<\/p>\n

Kdysi byla komunikace v RTTY popul\u00e1rn\u011bj\u0161\u00ed, ale nyn\u00ed, kdy\u017e jsem se p\u0159ihl\u00e1sil na websdr, nesly\u0161el jsem \u017e\u00e1dn\u00fd sign\u00e1l, tak\u017ee je t\u011b\u017ek\u00e9 uv\u00e9st p\u0159\u00edklad dek\u00f3dov\u00e1n\u00ed. Ti, kdo maj\u00ed z\u00e1jem, si mohou poslechnout sami na 7.045 nebo 14.080 MHz, podrobn\u011bji o teletype bylo naps\u00e1no v prvn\u00ed \u010d\u00e1sti<\/a><\/noindex> \u010dl\u00e1nku.<\/p>\n

PSK31\/63<\/h2>\n

\nDal\u0161\u00ed typ komunikace \u2014 f\u00e1zov\u00e1 modulace, Phase Shift Keying<\/a><\/noindex>. Zde se nem\u011bn\u00ed frekvence, ale f\u00e1ze, na grafu to vypad\u00e1 p\u0159ibli\u017en\u011b takto:
\n\"Co
\n
\nBitov\u00e9 k\u00f3dov\u00e1n\u00ed sign\u00e1lu spo\u010d\u00edv\u00e1 ve zm\u011bn\u011b f\u00e1ze o 180 stup\u0148\u016f, a samotn\u00fd sign\u00e1l p\u0159edstavuje vlastn\u011b \u010distou sinusovku \u2014 to zaji\u0161\u0165uje dobrou p\u0159enosovou vzd\u00e1lenost p\u0159i minim\u00e1ln\u00edm p\u0159en\u00e1\u0161en\u00e9m v\u00fdkonu. F\u00e1zov\u00fd posun je obt\u00ed\u017en\u00e9 vid\u011bt na screenshotu, lze jej pozorovat p\u0159i zv\u011bt\u0161en\u00ed a p\u0159ekryt\u00ed jednoho fragmentu na druh\u00fd.
\n\"Co
\n
\nSamotn\u00e9 k\u00f3dov\u00e1n\u00ed je relativn\u011b jednoduch\u00e9 \u2014 v BPSK31 se sign\u00e1ly p\u0159en\u00e1\u0161ej\u00ed rychlost\u00ed 31,25 b\u00f3du, zm\u011bna f\u00e1ze k\u00f3duje \u201e0\u201c, absence zm\u011bny f\u00e1ze \u201e1\u201c. K\u00f3dov\u00e1n\u00ed symbol\u016f si m\u016f\u017eete prohl\u00e9dnout na Wikipedii.<\/p>\n

\"Co
\n
\nVizualizovan\u011b je na spektru sign\u00e1l BPSK vid\u011bt jako \u00fazk\u00e1 \u010d\u00e1ra a p\u0159i poslechu zn\u00ed jako docela \u010dist\u00fd t\u00f3n (\u010d\u00edm\u017e vlastn\u011b je). Sign\u00e1ly BPSK m\u016f\u017eete nap\u0159\u00edklad zaslechnout na 7080 nebo 14070 MHz. <\/p>\n

Je zaj\u00edmav\u00e9 poznamenat, \u017ee jak v BPSK, tak v RTTY lze z 'jasnosti' \u010dar usuzovat na s\u00edlu sign\u00e1lu a kvalitu p\u0159\u00edjmu \u2013 pokud \u010d\u00e1st zpr\u00e1vy chyb\u00ed, na tomto m\u00edst\u011b zpr\u00e1vy bude 'odpad', ale celkov\u00fd smysl zpr\u00e1vy \u010dasto z\u016fst\u00e1v\u00e1 jasn\u00fd. Oper\u00e1tor si m\u016f\u017ee vybrat, na kter\u00fd sign\u00e1l se zam\u011b\u0159it, aby ho dek\u00f3doval. Hled\u00e1n\u00ed nov\u00fdch a slab\u00fdch sign\u00e1l\u016f od vzd\u00e1len\u00fdch korespondent\u016f je samo o sob\u011b velmi zaj\u00edmav\u00e9. Na rozd\u00edl od toho jsou n\u00e1sleduj\u00edc\u00ed protokoly mnohem automatizovan\u011bj\u0161\u00ed a prakticky nevy\u017eaduj\u00ed lidskou \u00fa\u010dast. Zda je to dobr\u00e9 nebo \u0161patn\u00e9, je filozofick\u00e1 ot\u00e1zka, ale ur\u010dit\u011b lze \u0159\u00edci, \u017ee n\u011bjak\u00e1 \u010d\u00e1st ducha ham radio se v takov\u00fdch re\u017eimech ur\u010dit\u011b ztr\u00e1c\u00ed.<\/p>\n

FT8\/FT4<\/h2>\n

\nPro dek\u00f3dov\u00e1n\u00ed n\u00e1sleduj\u00edc\u00edho typu sign\u00e1l\u016f je pot\u0159eba nainstalovat program WSJT<\/a><\/noindex>. Sign\u00e1ly FT8<\/a><\/noindex> jsou p\u0159en\u00e1\u0161eny pomoc\u00ed frekven\u010dn\u00ed modulace z 8 frekvenc\u00ed se posunem pouze 6,25 kHz, tak\u017ee sign\u00e1l zab\u00edr\u00e1 \u0161\u00ed\u0159ku pouh\u00fdch 50 kHz. Data v FT8 jsou p\u0159en\u00e1\u0161ena 'bal\u00ed\u010dky' trvaj\u00edc\u00edmi p\u0159ibli\u017en\u011b 14 sekund, tak\u017ee p\u0159esn\u00e1 synchronizace \u010dasu po\u010d\u00edta\u010de je velmi aktu\u00e1ln\u00ed. P\u0159\u00edjem je t\u00e9m\u011b\u0159 zcela automatizovan\u00fd \u2013 program dek\u00f3duje volac\u00ed znak a s\u00edlu sign\u00e1lu.<\/p>\n

\"Co
\n
\nV nov\u00e9 verzi protokolu FT4<\/a><\/noindex>, kter\u00fd byl ned\u00e1vno uveden, byla d\u00e9lka bal\u00ed\u010dku zkr\u00e1cena na 5 s, pou\u017e\u00edv\u00e1 se 4-tonov\u00e1 modulace p\u0159i rychlosti p\u0159enosu 23 baud\u016f. \u0160\u00ed\u0159ka obsazen\u00e9ho p\u00e1sma sign\u00e1lu je p\u0159ibli\u017en\u011b 90 kHz.<\/p>\n

WSPR<\/h2>\n

\nWSPR je protokol speci\u00e1ln\u011b zam\u011b\u0159en\u00fd na p\u0159\u00edjem a vys\u00edl\u00e1n\u00ed slab\u00fdch sign\u00e1l\u016f. Je to sign\u00e1l p\u0159en\u00e1\u0161en\u00fd rychlost\u00ed pouh\u00fdch 1,4648 baudu (ano, jen o n\u011bco v\u00edc ne\u017e 1 bit za sekundu). K p\u0159enosu se pou\u017e\u00edv\u00e1 frekven\u010dn\u00ed modulace (4-FSK) s rozsahem frekvenc\u00ed 1,4648 Hz, tak\u017ee \u0161\u00ed\u0159ka p\u00e1sma sign\u00e1lu je pouh\u00fdch 6 Hz. P\u0159ed\u00e1van\u00fd datov\u00fd bal\u00ed\u010dek m\u00e1 velikost 50 bit\u016f, ke kter\u00fdm jsou tak\u00e9 p\u0159id\u00e1ny bity pro opravu chyb (non-recursive convolutional code, constraint length K=32, rate=1\/2), celkov\u00e1 velikost bal\u00ed\u010dku tedy \u010din\u00ed 162 bit\u016f. Tyto 162 bit\u016f se p\u0159en\u00e1\u0161ej\u00ed p\u0159ibli\u017en\u011b za 2 minuty (n\u011bkdo si je\u0161t\u011b st\u011b\u017euje na pomal\u00fd internet?:).<\/p>\n

\"Co
\n
\nV\u0161e toto umo\u017e\u0148uje p\u0159en\u00e1\u0161et data prakticky pod \u00farovn\u00ed \u0161umu, s t\u00e9m\u011b\u0159 fantastick\u00fdmi v\u00fdsledky \u2013 nap\u0159\u00edklad sign\u00e1lem 100 mW z nohy mikroprocesoru se pomoc\u00ed pokojov\u00e9 r\u00e1mov\u00e9 ant\u00e9ny poda\u0159ilo p\u0159en\u00e9st sign\u00e1l na 1000 km.<\/p>\n

WSPR funguje pln\u011b automaticky a nevy\u017eaduje zapojen\u00ed oper\u00e1tora. Sta\u010d\u00ed nechat program pracovat a po n\u011bjak\u00e9 dob\u011b je mo\u017en\u00e9 se pod\u00edvat na protokol \u010dinnosti. Data mohou b\u00fdt tak\u00e9 odes\u00edl\u00e1na na webovou str\u00e1nku wsprnet.org<\/a><\/noindex>, co\u017e je u\u017eite\u010dn\u00e9 pro hodnocen\u00ed dostupnosti nebo kvality ant\u00e9ny \u2014 je mo\u017en\u00e9 p\u0159en\u00e9st sign\u00e1l a okam\u017eit\u011b zjistit online, kde byl p\u0159ijat. <\/p>\n

\"Co
\n
\nMimochodem, p\u0159ipojit se k p\u0159\u00edjmu WSPR m\u016f\u017ee kdokoli, i bez radiomateri\u00e1lov\u00e9ho volac\u00edho znak, (pro p\u0159\u00edjem nen\u00ed nezbytn\u00fd) \u2014 sta\u010d\u00ed m\u00edt p\u0159ij\u00edma\u010d a program WSPR, p\u0159i\u010dem\u017e to v\u0161echno m\u016f\u017ee fungovat i autonomn\u011b na Raspberry Pi. Syst\u00e9m je zaj\u00edmav\u00fd jak z v\u011bdeck\u00e9ho hlediska, tak pro experimenty s hardwarem a ant\u00e9nami. Bohu\u017eel, pokud jde o hustotu p\u0159\u00edjmov\u00fdch stanic, Rusko se nemus\u00ed p\u0159\u00edli\u0161 li\u0161it od S\u00fad\u00e1nu, Egypta nebo Nig\u00e9rie, tak\u017ee nov\u00ed \u00fa\u010dastn\u00edci jsou v\u017edy v\u00edt\u00e1ni \u2014 je mo\u017enost b\u00fdt prvn\u00ed a jedn\u00edm p\u0159ij\u00edma\u010dem pokr\u00fdt \u00fazem\u00ed a\u017e tis\u00edc kilometr\u016f.<\/p>\n

\"Co
\n
\nVelmi zaj\u00edmav\u00fdm a pom\u011brn\u011b slo\u017eit\u00fdm je p\u0159enos WSPR na frekvenc\u00edch nad 1 GHz \u2014 stabilita frekvence p\u0159ij\u00edma\u010de a vys\u00edla\u010de je tu pom\u011brn\u011b kritick\u00e1.<\/p>\n

T\u00edmto bych ukon\u010dil p\u0159ehled, a\u010dkoli bylo samoz\u0159ejm\u011b uvedeno daleko ne v\u0161echno, pouze to nejpopul\u00e1rn\u011bj\u0161\u00ed.<\/p>\n

Z\u00e1v\u011br<\/h2>\n

\nPokud m\u00e1 n\u011bkdo chu\u0165 tak\u00e9 vyzkou\u0161et sv\u00e9 s\u00edly, nen\u00ed to tak slo\u017eit\u00e9. K p\u0159\u00edjmu sign\u00e1l\u016f m\u016f\u017eete pou\u017e\u00edt bu\u010f klasick\u00fd (Tecsun PL-880, Sangean ATS909X atd.), nebo SDR p\u0159ij\u00edma\u010d (SDRPlay RSP2, SDR Elad). Pot\u00e9 sta\u010d\u00ed nainstalovat programy, jak bylo uvedeno v\u00fd\u0161e, a m\u016f\u017eete si samostatn\u011b prozkoum\u00e1vat r\u00e1dioefter. Cena z\u00e1le\u017eitosti se pohybuje mezi 100 a\u017e 200 $ v z\u00e1vislosti na modelu p\u0159ij\u00edma\u010de. M\u016f\u017eete tak\u00e9 vyu\u017e\u00edt online p\u0159ij\u00edma\u010de a vlastn\u011b nic nekupovat, a\u010dkoli to nen\u00ed tak zaj\u00edmav\u00e9.<\/p>\n

Pro ty, kdo budou cht\u00edt pracovat tak\u00e9 na p\u0159enosu, bude muset zakoupit transceiver s ant\u00e9nou a vy\u0159\u00eddit si radiomateri\u00e1lovou licenci. Cena transceiveru je p\u0159ibli\u017en\u011b rovna cen\u011b iPhonu, tak\u017ee pokud m\u00e1te z\u00e1jem, je to zcela dostupn\u00e9. Tak\u00e9 bude t\u0159eba zvl\u00e1dnout jednoduchou zkou\u0161ku a u\u017e za n\u011bjak\u00fd m\u011bs\u00edc m\u016f\u017eete pln\u011b pracovat v \u00e9teru. Samoz\u0159ejm\u011b, \u017ee to nen\u00ed jednoduch\u00e9 \u2014 budete se muset nau\u010dit r\u016fzn\u00e9 typy ant\u00e9n, vymyslet zp\u016fsob instalace, pochopit frekvence a typy z\u00e1\u0159en\u00ed. A\u010dkoli slovo \u201ebudete muset\u201c zde asi nen\u00ed na m\u00edst\u011b, proto\u017ee to je kon\u00ed\u010dek a d\u011bl\u00e1 se to pro z\u00e1bavu, a ne z donucen\u00ed. <\/p>\n

P\u0159eji v\u0161em \u00fasp\u011b\u0161n\u00e9 experimenty. Mo\u017en\u00e1 n\u011bkdo z \u010dten\u00e1\u0159\u016f vytvo\u0159\u00ed nov\u00fd digit\u00e1ln\u00ed zp\u016fsob komunikace, a j\u00e1 r\u00e1d za\u0159ad\u00edm jeho p\u0159ehled do tohoto textu \ud83d\ude09
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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