{"id":36871,"date":"2019-10-31T22:14:23","date_gmt":"2019-10-31T19:14:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sravnitelnyj-obzor-portativnyh-svch-priborov-arinst-vs-anritsu\/"},"modified":"2019-10-31T22:14:23","modified_gmt":"2019-10-31T19:14:23","slug":"sravnitelnyj-obzor-portativnyh-svch-priborov-arinst-vs-anritsu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/sravnitelnyj-obzor-portativnyh-svch-priborov-arinst-vs-anritsu","title":{"rendered":"Srovn\u00e1vac\u00ed p\u0159ehled p\u0159enosn\u00fdch mikrovlnn\u00fdch p\u0159\u00edstroj\u016f Arinst vs Anritsu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Srovn\u00e1vac\u00ed
\n
\nNa nez\u00e1visl\u00fd test dorazily dva p\u0159\u00edstroje od rusk\u00e9ho v\u00fdrobce \u00abKroks\u00bb. Jsou to pom\u011brn\u011b kompaktn\u00ed r\u00e1diov\u00e9 frekven\u010dn\u00ed m\u011b\u0159i\u010de, konkr\u00e9tn\u011b: spektr\u00e1ln\u00ed analyz\u00e1tor se zabudovan\u00fdm gener\u00e1torem sign\u00e1l\u016f a vektorov\u00fd analyz\u00e1tor obvod\u016f (reflektometr). Ob\u011b za\u0159\u00edzen\u00ed maj\u00ed horn\u00ed frekven\u010dn\u00ed p\u00e1smo a\u017e do 6,2 GHz. <\/p>\n

Vznikl z\u00e1jem zjistit, zda se jedn\u00e1 o dal\u0161\u00ed kapesn\u00ed \u00abukazatele\u00bb (hra\u010dky), nebo opravdu hodnotn\u00e9 p\u0159\u00edstroje, proto\u017ee v\u00fdrobce je prezentuje: -\u201eP\u0159\u00edstroj nen\u00ed ur\u010den pro profesion\u00e1ln\u00ed m\u011b\u0159en\u00ed, ale pro pou\u017eit\u00ed r\u00e1diov\u00fdmi nad\u0161enci.\u201d <\/p>\n

Pozornost \u010dten\u00e1\u0159\u016f! Tyto testy byly prov\u00e1d\u011bny amat\u00e9rsky a nijak nepretenduj\u00ed na metrologick\u00e1 zkoum\u00e1n\u00ed m\u011b\u0159ic\u00edch prost\u0159edk\u016f na z\u00e1klad\u011b standard\u016f st\u00e1tn\u00edho registru a v\u0161eho ostatn\u00edho s t\u00edm souvisej\u00edc\u00edho. R\u00e1diov\u00ed nad\u0161enci se zaj\u00edmaj\u00ed o srovn\u00e1vac\u00ed m\u011b\u0159en\u00ed \u010dasto pou\u017e\u00edvan\u00fdch za\u0159\u00edzen\u00ed v praxi (anteny, filtry, atenu\u00e1tory), nikoli o teoretick\u00e9 \u201eabstrakce\u201c, jak je b\u011b\u017en\u00e9 v metrologii, nap\u0159\u00edklad: nesouhlasn\u00e9 z\u00e1t\u011b\u017ee, nehomogenn\u00ed p\u0159enosov\u00e9 linky nebo \u00faseky kr\u00e1tkozav\u0159en\u00fdch lini\u00ed, kter\u00e9 nebyly v tomto testu pou\u017eity.
\n <\/a><\/noindex>
\nAby se p\u0159ede\u0161lo vlivu interference p\u0159i srovn\u00e1vac\u00edm m\u011b\u0159en\u00ed ant\u00e9n, je t\u0159eba bezechoov\u00e1 komora, nebo otev\u0159en\u00fd prostor. Vzhledem k absenci prvn\u00ed mo\u017enosti, m\u011b\u0159en\u00ed se prov\u00e1d\u011bla venku, v\u0161echny ant\u00e9ny s c\u00edlen\u00fdmi Dn \u201ec\u00edtily\u201c k nebi, upevn\u011bny na stativu, bez pohybu v prostoru p\u0159i v\u00fdm\u011bn\u011b p\u0159\u00edstroj\u016f.
\nV testech byl pou\u017eit f\u00e1zov\u011b stabiln\u00ed koaxi\u00e1ln\u00ed kabel m\u011b\u0159\u00edc\u00ed t\u0159\u00eddy, Anritsu 15NNF50-1.5C, a adapt\u00e9ry N-SMA od zn\u00e1m\u00fdch firem: Midwest Microwave, Amphenol, Pasternack, Narda.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n\"Srovn\u00e1vac\u00ed
\n
\nLevn\u00e9 adapt\u00e9ry \u010d\u00ednsk\u00e9 v\u00fdroby nebyly pou\u017eity, vzhledem k \u010dast\u00e9mu nedostatku opakovatelnosti kontaktu p\u0159i rekonekci, a tak\u00e9 z d\u016fvodu odlupov\u00e1n\u00ed slab\u00e9ho antioxida\u010dn\u00edho povlaku, kter\u00fd je u nich pou\u017eit m\u00edsto b\u011b\u017en\u00e9ho zlacen\u00ed\u2026<\/p>\n

Aby se zajistily stejn\u00e9 srovn\u00e1vac\u00ed podm\u00ednky, byly p\u0159ed ka\u017ed\u00fdm m\u011b\u0159en\u00edm p\u0159\u00edstroje kalibrov\u00e1ny stejnou sadou OSL kalibr\u00e1tor\u016f v podobn\u00e9m frekven\u010dn\u00edm p\u00e1smu a aktu\u00e1ln\u00edm teplotn\u00edm rozsahu. OSL znamen\u00e1 \u201eOpen\u201c, \u201eShort\u201c, \u201eLoad\u201c, tedy standardn\u00ed soubor kalibra\u010dn\u00edch opat\u0159en\u00ed: \u201evoln\u00fd m\u011b\u0159i\u010d\u201c, \u201ekr\u00e1tk\u00fd spoj\u201c a \u201e\u010d\u00e1ste\u010dn\u00e1 z\u00e1t\u011b\u017e 50,0 Ohm\u201c, kter\u00fdmi se obvykle kalibruj\u00ed vektorov\u00e9 analyz\u00e1tory obvod\u016f. Pro SMA form\u00e1t byla pou\u017eita kalibra\u010dn\u00ed sada Anritsu 22S50, normalizovan\u00e1 v rozsahu frekvenc\u00ed od DC do 26,5 GHz, odkaz na datov\u00fd list (49 str.):
\nwww.testmart.com\/webdata\/mfr_pdfs\/ANRI\/ANRITSU_COMPONENTS.pdf<\/a><\/noindex><\/p>\n

Pro kalibraci typu N se pou\u017eila sada Anritsu OSLN50-1, normalizovan\u00e1 od DC do 6 GHz. <\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nNam\u011b\u0159en\u00fd odpor na z\u00e1t\u011b\u017ei kalibr\u00e1tor\u016f byl 50 \u00b10,02 Ohm. M\u011b\u0159en\u00ed byla provedena certifikovan\u00fdmi, precizn\u00edmi multimetry laboratorn\u00ed t\u0159\u00eddy zna\u010dek HP a Fluke.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n\"Srovn\u00e1vac\u00ed
\n
\nAby se zajistila nejlep\u0161\u00ed p\u0159esnost, stejn\u011b jako rovn\u011bj\u0161\u00ed podm\u00ednky p\u0159i srovn\u00e1vac\u00edch testech, byla na p\u0159\u00edstroj\u00edch nastavena podobn\u00e1 \u0161\u00ed\u0159ka p\u00e1sma filtru P\u010c, nebo\u0165 \u010d\u00edm u\u017e\u0161\u00ed je tento p\u00e1s, t\u00edm vy\u0161\u0161\u00ed je p\u0159esnost m\u011b\u0159en\u00ed a pom\u011br sign\u00e1l\/\u0161um. Bylo tak\u00e9 vybr\u00e1no co nejv\u00edce bod\u016f skenov\u00e1n\u00ed (bl\u00edzk\u00fdch 1000). <\/p>\n

Pro sezn\u00e1men\u00ed se v\u0161emi funkcemi zkouman\u00e9ho reflektometru je k dispozici odkaz na ilustrovanou, tov\u00e1rn\u00ed p\u0159\u00edru\u010dku:
\narinst.ru\/files\/Manual_Vector_Reflectometer_ARINST_VR_23-6200_RUS.pdf<\/a><\/noindex><\/p>\n

P\u0159ed ka\u017ed\u00fdm m\u011b\u0159en\u00edm byly pe\u010dliv\u011b kontrolov\u00e1ny v\u0161echny spojovac\u00ed plochy v koaxi\u00e1ln\u00edch konektorech (SMA, RP-SMA, typ N), proto\u017ee p\u0159i frekvenc\u00edch nad 2-3 GHz za\u010dne \u010distota a stav antioxida\u010dn\u00ed plochy t\u011bchto kontakt\u016f m\u00edt znateln\u00fd vliv na v\u00fdsledky m\u011b\u0159en\u00ed a stabilitu jejich opakovatelnosti. Je velmi d\u016fle\u017eit\u00e9 udr\u017eovat v \u010distot\u011b vn\u011bj\u0161\u00ed plochu centr\u00e1ln\u00edho kol\u00edku v koaxi\u00e1ln\u00edm konektoru a spojovanou vnit\u0159n\u00ed plochu obj\u00edmky na odpov\u00eddaj\u00edc\u00ed polovin\u011b. Tot\u00e9\u017e plat\u00ed i pro \u201epletencov\u00fd\u201c kontakt. Takov\u00e1 kontrola a pot\u0159ebn\u00e9 \u010di\u0161t\u011bn\u00ed se obvykle prov\u00e1d\u011bj\u00ed pod mikroskopem nebo pod zv\u011bt\u0161ovac\u00edm sklem. <\/p>\n

Tak\u00e9 je d\u016fle\u017eit\u00e9, aby na povrchu izol\u00e1tor\u016f v koaxi\u00e1ln\u00edch spojk\u00e1ch nebyly \u017e\u00e1dn\u00e9 uvolniteln\u00e9 kovov\u00e9 t\u0159\u00edsky, proto\u017ee ty za\u010d\u00ednaj\u00ed vn\u00e1\u0161et parazitn\u00ed kapacitu, co\u017e v\u00fdrazn\u011b naru\u0161uje funk\u010dnost a p\u0159enos sign\u00e1lu.<\/p>\n

P\u0159\u00edklad typick\u00e9ho metalizovan\u00e9ho zne\u010di\u0161t\u011bn\u00ed konektor\u016f SMA, neviditeln\u00e9ho na prvn\u00ed pohled:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nPodle v\u00fdrobcem stanoven\u00fdch po\u017eadavk\u016f na mikrovlnn\u00e9 koaxi\u00e1ln\u00ed konektory s z\u00e1vitov\u00fdm typem spojen\u00ed nelze p\u0159i p\u0159ipojov\u00e1n\u00ed ot\u00e1\u010det centr\u00e1ln\u00edm kontaktem, kter\u00fd vstupuje do jeho p\u0159ij\u00edmac\u00ed obj\u00edmky. Je nutn\u00e9 dr\u017eet axi\u00e1ln\u00ed z\u00e1kladnu na\u0161roubovan\u00e9 poloviny konektoru a povolit ot\u00e1\u010den\u00ed pouze matice, nikoli cel\u00e9 \u0161roubovan\u00e9 konstrukce. T\u00edmto se v\u00fdrazn\u011b sni\u017euje po\u0161kr\u00e1b\u00e1n\u00ed a jin\u00e1 mechanick\u00e1 opot\u0159eben\u00ed spojen\u00fdch ploch, co\u017e zaji\u0161\u0165uje lep\u0161\u00ed kontakt a prodlu\u017euje po\u010det cykl\u016f sp\u00edn\u00e1n\u00ed. <\/p>\n

Bohu\u017eel, m\u00e1lokdo z nad\u0161enc\u016f o tom v\u00ed, a v\u011bt\u0161ina \u0161roubuje celek, poka\u017ed\u00e9 po\u0161krab\u00e1vaj\u00edc a tak u\u017e tenou\u010dk\u00fd povrch pracovn\u00edch ploch kontakt\u016f. O tom sv\u011bd\u010d\u00ed \u0159ada vide\u00ed na YouTube od tzv. \"testovac\u00edch tester\u016f\" nov\u00fdch mikrovlnn\u00fdch za\u0159\u00edzen\u00ed.<\/p>\n

V t\u00e9to testovac\u00ed recenzi byla v\u0161echna \u010detn\u00e1 p\u0159ipojen\u00ed koaxi\u00e1ln\u00edch konektor\u016f a kalibr\u00e1tor\u016f provedena s p\u0159\u00edsn\u00fdm dodr\u017eov\u00e1n\u00edm v\u00fd\u0161e uveden\u00fdch provozn\u00edch po\u017eadavk\u016f.<\/p>\n

V r\u00e1mci srovn\u00e1vac\u00edch test\u016f byly m\u011b\u0159eny r\u016fzn\u00e9 ant\u00e9ny pro ov\u011b\u0159en\u00ed \u00fadaj\u016f reflektometru v r\u016fzn\u00fdch frekven\u010dn\u00edch p\u00e1smech.<\/p>\n

Srovn\u00e1n\u00ed 7-elementov\u00e9 ant\u00e9ny Uda-Yagi v p\u00e1smu 433 MHz (LPD)<\/h4>\n

\"Srovn\u00e1vac\u00ed
\n
\nJeliko\u017e ant\u00e9ny tohoto typu maj\u00ed v\u017edy v\u00fdrazn\u00fd zadn\u00ed lalok a tak\u00e9 n\u011bkolik bo\u010dn\u00edch, byly pro \u010distotu testu p\u0159\u00edsn\u011b dodr\u017eov\u00e1ny v\u0161echny okoln\u00ed podm\u00ednky nehybnosti, a\u017e po uzam\u010den\u00ed ko\u010dky v dom\u011b. Aby p\u0159i fotografov\u00e1n\u00ed r\u016fzn\u00fdch re\u017eim\u016f na displej\u00edch nez\u016fstala nen\u00e1padn\u011b v dosahu zadn\u00edho laloku, a t\u00edm nevytvo\u0159ila ru\u0161en\u00ed v grafu. <\/p>\n

Na obr\u00e1zc\u00edch jsou shrom\u00e1\u017ed\u011bny fotografie ze t\u0159\u00ed p\u0159\u00edstroj\u016f, po 4 re\u017eimech z ka\u017ed\u00e9ho.<\/p>\n

Horn\u00ed sn\u00edmek je ze subjektivn\u00edho VR 23-6200, prost\u0159edn\u00ed z Anritsu S361E a doln\u00ed z GenCom 747A.<\/p>\n

Grafy SWR:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nGrafy odra\u017een\u00fdch ztr\u00e1t: <\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nGrafy diagramu \u00fapln\u00fdch impedanc\u00ed Wolpert-Smith:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nGrafy f\u00e1ze:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nJak je vid\u011bt, vznikl\u00e9 grafy jsou si velmi podobn\u00e9, p\u0159i\u010dem\u017e hodnoty m\u011b\u0159en\u00ed maj\u00ed rozptyl v rozmez\u00ed 0,1 % chyby.<\/p>\n

Srovn\u00e1n\u00ed koaxi\u00e1ln\u00edho dip\u00f3lu v p\u00e1smu 1,2 GHz<\/h4>\n

\n\"Srovn\u00e1vac\u00ed
\n
\nSWR:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nReflexn\u00ed ztr\u00e1ty:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nDiagram Wolpert-Smith:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nF\u00e1ze:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nV\u0161echny t\u0159i p\u0159\u00edstroje zde zm\u011b\u0159ily rezon\u010dn\u00ed frekvenci t\u00e9to ant\u00e9ny s odchylkou do 0,07 %.<\/p>\n

Srovn\u00e1n\u00ed parabolick\u00e9 ant\u00e9ny v p\u00e1smu 3-6 GHz<\/h4>\n

\n\"Srovn\u00e1vac\u00ed
\n
\nByl pou\u017eit prodlu\u017eovac\u00ed kabel s N konektory, kter\u00fd do m\u011b\u0159en\u00ed trochu vnesl nerovnom\u011brnost. Ale proto\u017ee \u0161lo o jednoduch\u00e9 srovn\u00e1n\u00ed p\u0159\u00edstroj\u016f, nikoliv kabel\u016f nebo ant\u00e9n, pokud se v sign\u00e1lu objevila n\u011bjak\u00e1 chyba, m\u011bly by p\u0159\u00edstroje uk\u00e1zat, jak to je.<\/p>\n

Kalibrace m\u011b\u0159ic\u00ed (referen\u010dn\u00ed) roviny s ohledem na adapt\u00e9r a vodi\u010d:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nVSWR v p\u00e1smu od 3 do 6 GHz:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nReflexn\u00ed ztr\u00e1ty:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nDiagram Wolpert-Smith:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nF\u00e1zov\u00e9 grafy:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n<\/p>\n

Srovn\u00e1n\u00ed ant\u00e9ny s kruhovou polarizac\u00ed v p\u00e1smu 5,8 GHz<\/h4>\n

\n\"Srovn\u00e1vac\u00ed
\n
\nSWR:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nReflexn\u00ed ztr\u00e1ty:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nDiagram Wolpert-Smith:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nF\u00e1ze:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n<\/p>\n

Srovn\u00e1vac\u00ed m\u011b\u0159en\u00ed VSWR \u010d\u00ednsk\u00e9ho LPF filtru 1,4 GHz<\/h4>\n

\nVzhled filtru:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nGrafy SWR:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n<\/p>\n

Srovn\u00e1vac\u00ed m\u011b\u0159en\u00ed d\u00e9lky vodi\u010de (DTF)<\/h4>\n

\nRozhodl jsem se zm\u011b\u0159it nov\u00fd koaxi\u00e1ln\u00ed kabel s N konektory:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nDvoumetrov\u00fdm metrem jsem po t\u0159ech pokusech zm\u011b\u0159il 3 metry 5 centimetr\u016f.<\/p>\n

A takto m\u011bly p\u0159\u00edstroje v\u00fdsledky:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nTady, jak se \u0159\u00edk\u00e1, koment\u00e1\u0159e jsou zbyte\u010dn\u00e9.<\/p>\n

Srovn\u00e1n\u00ed p\u0159esnosti vestav\u011bn\u00e9ho sledovac\u00edho gener\u00e1toru<\/h4>\n

\nNa tomto gif obr\u00e1zku je sestaveno 10 fotografi\u00ed m\u011b\u0159en\u00ed frekven\u010dn\u00edho m\u011b\u0159i\u010de \u010c3-54. Horn\u00ed poloviny obr\u00e1zk\u016f ukazuj\u00ed m\u011b\u0159en\u00ed testovan\u00e9ho VR 23-6200. Doln\u00ed poloviny - sign\u00e1ly dodan\u00e9 reflektometrem Anritsu. Byly vybr\u00e1ny \u010dty\u0159i frekvence: 23, 50, 100, 150 a 200 MHz. Pokud Anritsu dod\u00e1val frekvenci s nulami na ni\u017e\u0161\u00edch hodnot\u00e1ch, kompaktn\u00ed VR dod\u00e1val s mal\u00fdm zv\u00fd\u0161en\u00edm, numericky rostouc\u00edm se zvy\u0161uj\u00edc\u00ed se frekvenc\u00ed:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nA\u010dkoliv podle specifikac\u00ed v\u00fdrobce to nen\u00ed \u017e\u00e1dn\u00fd \u201eminus\u201c, nebo\u0165 se to nevejde do uveden\u00fdch dvou \u0159\u00e1d\u016f po desetin\u011b.<\/p>\n

Obr\u00e1zky poskl\u00e1dan\u00e9 do gifu o vnit\u0159n\u00edm \u201ezdoben\u00ed\u201c p\u0159\u00edstroje:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nPlusy: <\/p>\n

Mezi p\u0159ednosti za\u0159\u00edzen\u00ed VR 23-6200 pat\u0159\u00ed jeho n\u00edzk\u00e1 cena, p\u0159enosnost a kompaktnost bez pot\u0159eby extern\u00edho displeje z po\u010d\u00edta\u010de nebo smartphonu, p\u0159i\u010dem\u017e m\u00e1 pom\u011brn\u011b \u0161irok\u00fd frekven\u010dn\u00ed rozsah uveden\u00fd na \u0161t\u00edtku. Je tak\u00e9 pozitivn\u00ed skute\u010dnost, \u017ee se nejedn\u00e1 o skal\u00e1rn\u00ed, ale o plnohodnotn\u00fd vektorov\u00fd m\u011b\u0159i\u010d. Jak lze vid\u011bt z v\u00fdsledk\u016f srovn\u00e1vac\u00edch m\u011b\u0159en\u00ed, VR prakticky nezaost\u00e1v\u00e1 za v\u011bt\u0161\u00edmi, renomovan\u00fdmi a velmi drah\u00fdmi p\u0159\u00edstroji. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b je pro kontrolu stavu feeder\u016f a ant\u00e9n lep\u0161\u00ed pou\u017e\u00edt tohoto mal\u00e9ho pomocn\u00edka ne\u017e v\u011bt\u0161\u00ed a t\u011b\u017e\u0161\u00ed za\u0159\u00edzen\u00ed. A pro nyn\u00ed popul\u00e1rn\u00ed frekven\u010dn\u00ed p\u00e1smo 5,8 GHz pro FPV z\u00e1vody (r\u00e1diem \u0159\u00edzen\u00e9 l\u00e9taj\u00edc\u00ed multikopt\u00e9ry a letadla s palubn\u00edm videostreamingem na br\u00fdle nebo displeje) je to nezbytnost. Umo\u017e\u0148uje snadno vyb\u00edrat optim\u00e1ln\u00ed ant\u00e9nu z n\u00e1hradn\u00edch p\u0159\u00edmo b\u011bhem letu, nebo dokonce nastavit a srovnat ant\u00e9nu, kter\u00e1 se poma\u010dkala po p\u00e1du z\u00e1vodn\u00ed l\u00e9taj\u00edc\u00ed ma\u0161inky. Za\u0159\u00edzen\u00ed lze pova\u017eovat za \u201epocket-sized\u201c, a d\u00edky sv\u00e9 n\u00edzk\u00e9 hmotnosti m\u016f\u017ee snadno viset i na tenk\u00e9m feederu, co\u017e je v\u00fdhodn\u00e9 p\u0159i mnoha ter\u00e9nn\u00edch prac\u00edch. <\/p>\n

I z\u00e1pory byly zaznamen\u00e1ny:<\/p>\n

1) Nejv\u011bt\u0161\u00edm provozn\u00edm nedostatkem reflektometru je nemo\u017enost rychle naj\u00edt minim\u00e1ln\u00ed nebo maxim\u00e1ln\u00ed hodnoty marker\u016f na grafu, nemluv\u011b o hled\u00e1n\u00ed \u201edelta\u201c nebo automatick\u00e9m vyhled\u00e1v\u00e1n\u00ed n\u00e1sleduj\u00edc\u00edch (nebo p\u0159edchoz\u00edch) minim a maxim.
\n Toto je obzvl\u00e1\u0161\u0165 \u017e\u00e1dan\u00e9 v re\u017eimech LMag a SWR, kde tato funkce ovl\u00e1d\u00e1n\u00ed marker\u016f v\u00fdrazn\u011b chyb\u00ed. Je nutn\u00e9 aktivovat marker v p\u0159\u00edslu\u0161n\u00e9m menu a pot\u00e9 ru\u010dn\u011b posunout marker na minimum k\u0159ivky, abychom mohli po\u010d\u00edtat frekvenci a hodnotu KSV v t\u00e9to chv\u00edli. Mo\u017en\u00e1 v\u00fdrobce v n\u00e1sleduj\u00edc\u00edch aktualizac\u00edch p\u0159id\u00e1 tuto funkci.<\/p>\n

1 a) Za\u0159\u00edzen\u00ed tak\u00e9 neum\u00ed p\u0159eassignovat po\u017eadovan\u00fd re\u017eim zobrazen\u00ed pro markery p\u0159i p\u0159echodu mezi m\u011b\u0159ic\u00edmi re\u017eimy. <\/p>\n

Nap\u0159\u00edklad, pokud p\u0159epnu z re\u017eimu VSWR na LMag (Return Loss), marker st\u00e1le ukazuje hodnotu VSWR, zat\u00edmco logicky by m\u011bl zobrazovat hodnotu odrazov\u00e9ho koeficientu v dB, tedy to, co aktu\u00e1ln\u011b ukazuje vybran\u00fd graf.
\nTo sam\u00e9 plat\u00ed i pro v\u0161echny ostatn\u00ed re\u017eimy. Aby bylo mo\u017en\u00e9 p\u0159e\u010d\u00edst odpov\u00eddaj\u00edc\u00ed hodnoty vybran\u00e9ho grafu v tabulce marker\u016f, je nutn\u00e9 poka\u017ed\u00e9 ru\u010dn\u011b p\u0159enastavit re\u017eim zobrazen\u00ed pro ka\u017ed\u00fd ze 4 marker\u016f. Zd\u00e1 se to jako drobnost, ale cht\u011blo by to n\u011bjakou formu \"automatizace\". <\/p>\n

1 b) V nej\u017e\u00e1dan\u011bj\u0161\u00edm re\u017eimu m\u011b\u0159en\u00ed VSWR nen\u00ed mo\u017en\u00e9 p\u0159epnout amplitudovou \u0161k\u00e1lu na podrobn\u011bj\u0161\u00ed, m\u00e9n\u011b ne\u017e 2,0 (nap\u0159\u00edklad 1,5 nebo 1,3).<\/p>\n

2) Existuje mal\u00e1 zvl\u00e1\u0161tnost v nekoherentn\u00edm prov\u00e1d\u011bn\u00ed kalibrace. Je to jakoby v\u017edy \"otev\u0159en\u00e1\" nebo \"paraleln\u00ed\" kalibrace. To znamen\u00e1, \u017ee nen\u00ed sekven\u010dn\u00ed mo\u017enost ulo\u017een\u00ed p\u0159e\u010dten\u00e9 hodnoty kalibr\u00e1toru, jak je obvykl\u00e9 u jin\u00fdch p\u0159\u00edstroj\u016f VNA. Obvykle p\u0159\u00edstroj v re\u017eimu kalibrace sekven\u010dn\u011b pod\u00e1v\u00e1, kterou kalibraci je aktu\u00e1ln\u011b pot\u0159eba nastavit (dal\u0161\u00ed) a prov\u00e9st jej\u00ed p\u0159e\u010dten\u00ed pro evidenci.<\/p>\n

A na ARINSTu je z\u00e1rove\u0148 poskytnuto pr\u00e1vo volby v\u0161ech t\u0159ech stisknut\u00ed pro ulo\u017een\u00ed m\u011b\u0159en\u00ed, co\u017e zvy\u0161uje po\u017eadavek na pozornost oper\u00e1tora p\u0159i prov\u00e1d\u011bn\u00ed dal\u0161\u00edho kroku kalibrace. I kdy\u017e jsem se nikdy neztratil, existuje mal\u00e1 mo\u017enost ud\u011blat chybu stisknut\u00edm tla\u010d\u00edtka, kter\u00e9 neodpov\u00edd\u00e1 p\u0159ipojen\u00e9mu konci kalibr\u00e1toru. <\/p>\n

Mo\u017en\u00e1 v n\u00e1sleduj\u00edc\u00edch upgradech firmwaru tv\u016frci tuto otev\u0159enou \"paralelnost\" v\u00fdb\u011bru \"zm\u011bn\u00ed\" na \"sekven\u010dnost\", aby se vylou\u010dila mo\u017enost chyby od oper\u00e1tora. V\u017edy\u0165 nen\u00ed n\u00e1hodou, \u017ee u velk\u00fdch p\u0159\u00edstroj\u016f je pou\u017eita jasn\u00e1 sekvence v \u010dinnostech s kalibra\u010dn\u00edmi m\u011b\u0159en\u00edmi pr\u00e1v\u011b pro vylou\u010den\u00ed podobn\u00e9 chyby z nepozornosti. <\/p>\n

3) Velmi \u00fazk\u00fd teplotn\u00ed rozsah kalibrace. Pokud na Anritsu po kalibraci je poskytov\u00e1n rozsah (nap\u0159\u00edklad) od +18 \u00b0C do +48 \u00b0C, tak na Arinstu pouze \u00b1 3 \u00b0C od teploty kalibrace, co\u017e m\u016f\u017ee b\u00fdt m\u00e1lo p\u0159i ter\u00e9nn\u00ed pr\u00e1ci (na ulici), na slunci nebo ve st\u00ednu.<\/p>\n

Nap\u0159\u00edklad: kalibroval jsem po ob\u011bd\u011b a pracuji s m\u011b\u0159en\u00edmi a\u017e do ve\u010dera, slunce zapadlo, teplota klesla a ukazatele za\u010daly b\u00fdt nekorektn\u00ed. <\/p>\n

N\u011bjak se neobjevuje varov\u00e1n\u00ed, kter\u00e9 by \u0159\u00edkalo - \u201ep\u0159e\u0159\u00eddit se kv\u016fli p\u0159ekro\u010den\u00ed teplotn\u00edho rozsahu p\u0159edchoz\u00ed kalibrace\u201c. M\u00edsto toho za\u010d\u00ednaj\u00ed chybn\u00e9 m\u011b\u0159en\u00ed se posunut\u00fdm nulov\u00fdm bodem, co\u017e v\u00fdrazn\u011b ovliv\u0148uje v\u00fdsledky m\u011b\u0159en\u00ed.<\/p>\n

Pro srovn\u00e1n\u00ed, takto o tom informuje reflektometr Anritsu:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n4) Pro uzav\u0159en\u00e9 prostory je norm\u00e1ln\u00ed, ale pro otev\u0159en\u00fd ter\u00e9n je displej velmi slab\u00fd.<\/p>\n

Za slune\u010dn\u00e9ho dne venku nen\u00ed v\u016fbec nic \u010diteln\u00e9ho, \u200b\u200bani kdy\u017e obrazovku st\u00edn\u00edte dlan\u00ed.
\n \u00daprava jasu displeje v\u016fbec nen\u00ed mo\u017en\u00e1.<\/p>\n

5) Tla\u010d\u00edtka by bylo dobr\u00e9 p\u0159ep\u00e1jet na jin\u00e1, proto\u017ee n\u011bkter\u00e1 nereaguj\u00ed na stisknut\u00ed hned.<\/p>\n

6) Dotykov\u00e1 obrazovka nen\u00ed na n\u011bkter\u00fdch m\u00edstech citliv\u00e1, ale jinde je p\u0159\u00edli\u0161 citliv\u00e1.<\/p>\n

Z\u00e1v\u011bry o reflektometru VR 23-6200<\/h4>\n

\nPokud se ned\u00edv\u00e1me na nedostatky, tak ve srovn\u00e1n\u00ed s jin\u00fdmi rozpo\u010dtov\u00fdmi, p\u0159enosn\u00fdmi a voln\u011b dostupn\u00fdmi \u0159e\u0161en\u00edmi, jako je RF Explorer, N1201SA, KC901V, RigExpert, SURECOM SW-102, NanoVNA \u2014 vypad\u00e1 Arinst VR 23-6200 jako nejlep\u0161\u00ed volba. Proto\u017ee u ostatn\u00edch je bu\u010f cena ji\u017e velmi nen\u00e1kladn\u00e1, nebo jsou omezen\u00e9 v p\u00e1smu frekvenc\u00ed, a t\u00edm p\u00e1dem nejsou univerz\u00e1ln\u00ed, nebo jsou v podstat\u011b ukazatele \u201ehra\u010dek\u201c. Navzdory skromnosti a relativn\u011b n\u00edzk\u00e9 cen\u011b se vektorov\u00fd reflektometr VR 23-6200 uk\u00e1zal jako p\u0159ekvapiv\u011b solidn\u00ed p\u0159\u00edstroj, a nav\u00edc velmi p\u0159enosn\u00fd. Kdyby v\u00fdrobci opravili nedostatky a m\u00edrn\u011b roz\u0161\u00ed\u0159ili doln\u00ed frekven\u010dn\u00ed limit pro radioamat\u00e9ry kr\u00e1tkovlnn\u00edky, tento p\u0159\u00edstroj by si zaslou\u017eil \u010destn\u00e9 m\u00edsto mezi v\u0161emi sv\u011btov\u00fdmi rozpo\u010dtov\u00fdmi p\u0159\u00edstroji podobn\u00e9ho ur\u010den\u00ed, proto\u017ee by to byl p\u0159\u00edstupn\u00fd cenov\u00fd rozsah: od \u201eKV\u201c do \u201eFPV\u201c, tedy od 2 MHz na KV (160 metr\u016f) do 5,8 GHz pro FPV (5 centimetr\u016f). A ide\u00e1ln\u011b bez mezer v cel\u00e9m p\u00e1smu, na rozd\u00edl od RF Explorer: <\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n Nepochybn\u011b se brzy objev\u00ed je\u0161t\u011b levn\u011bj\u0161\u00ed \u0159e\u0161en\u00ed v tak \u0161irok\u00e9m frekven\u010dn\u00edm p\u00e1smu, a to bude skv\u011bl\u00e9! Ale zat\u00edm (k datu \u010derven-\u010dervenec 2019), podle m\u00e9ho skromn\u00e9ho n\u00e1zoru je tento reflektometr nejlep\u0161\u00ed na sv\u011bt\u011b mezi p\u0159enosn\u00fdmi a levn\u00fdmi, s\u00e9riov\u011b dostupn\u00fdmi nab\u00eddkami. <\/p>\n

\u2014 Druh\u00e1 \u010d\u00e1st<\/b>
\n Spektr\u00e1ln\u00ed analyz\u00e1tor s tracking gener\u00e1torem SSA-TG R2<\/b><\/p>\n

Druh\u00fd p\u0159\u00edstroj je stejn\u011b zaj\u00edmav\u00fd jako vektorov\u00fd reflektometr.
\nUmo\u017e\u0148uje m\u011b\u0159en\u00ed \"skl\u00e1n\u011bn\u00fdch\" parametr\u016f r\u016fzn\u00fdch mikrovlnn\u00fdch za\u0159\u00edzen\u00ed v re\u017eimu 2-portov\u00fdch m\u011b\u0159en\u00ed (typ S21). Nap\u0159\u00edklad lze zkontrolovat funk\u010dnost a p\u0159esn\u011b zm\u011b\u0159it zes\u00edlen\u00ed booster\u016f, zesilova\u010d\u016f nebo \u00fatlum sign\u00e1lu (ztr\u00e1tu) v atenu\u00e1torech, filtrech, koaxi\u00e1ln\u00edch kabelech (nebo feederech) a dal\u0161\u00edch aktivn\u00edch a pasivn\u00edch za\u0159\u00edzen\u00edch a modulech, co\u017e nelze prov\u00e9st jednodenn\u00edm reflektometrem.
\nToto je plnohodnotn\u00fd spektr\u00e1ln\u00ed analyz\u00e1tor v pom\u011brn\u011b \u0161irok\u00e9m a nep\u0159etr\u017eit\u00e9m frekven\u010dn\u00edm rozsahu, co\u017e se mezi levnou hobby technikou nepovede \u010dasto. Krom\u011b toho m\u00e1 vestav\u011bn\u00fd sledovac\u00ed gener\u00e1tor r\u00e1diov\u00fdch frekvenc\u00ed, tak\u00e9 v \u0161irok\u00e9m spektru. To je pot\u0159ebn\u00e1 pom\u016fcka k reflektometru a ant\u00e9nn\u00edmu m\u011b\u0159i\u010di. Umo\u017e\u0148uje zjistit, zda nedoch\u00e1z\u00ed k deviaci nosn\u00e9 frekvence v p\u0159ena\u0161e\u010d\u00edch, parazitn\u00ed intermodulaci, clippingu a dal\u0161\u00edm\u2026
\n Pokud m\u00e1te sleduj\u00edc\u00ed gener\u00e1tor a spektr\u00e1ln\u00ed analyz\u00e1tor a p\u0159id\u00e1te extern\u00ed sm\u011brov\u00fd odbo\u010dova\u010d (nebo most), je mo\u017en\u00e9 m\u011b\u0159it stejnou VSWR ant\u00e9n, av\u0161ak pouze v re\u017eimu skal\u00e1rn\u00edho m\u011b\u0159en\u00ed, bez ohledu na f\u00e1zi, jak by to bylo u vektorov\u00e9ho m\u011b\u0159en\u00ed.
\nOdkaz na v\u00fdrobn\u00ed n\u00e1vod:
\n Tento p\u0159\u00edstroj byl p\u0159ev\u00e1\u017en\u011b srovn\u00e1v\u00e1n s kombinovan\u00fdm m\u011b\u0159ic\u00edm komplexem GenCom 747A, s omezen\u00edm na maxim\u00e1ln\u00ed frekvenci do 4 GHz. Tak\u00e9 v testech se pod\u00edlel nov\u00fd m\u011b\u0159i\u010d v\u00fdkonu p\u0159esn\u00e9 t\u0159\u00eddy Anritsu MA24106A, s tov\u00e1rn\u011b zak\u00f3dovan\u00fdmi opravn\u00fdmi tabulkami pro m\u011b\u0159enou frekvenci a teplotu, normovan\u00fd na frekvenci do 6 GHz. <\/p>\n

Vlastn\u00ed \u0161umov\u00e1 hladina spektr\u00e1ln\u00edho analyz\u00e1toru s uzav\u0159enou \u201etlum\u00edc\u00ed\u201c svorkou na vstupu:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nMinim\u00e1ln\u011b -85,5 dB se uk\u00e1zal kolem LPD (426 MHz).
\n S rostouc\u00ed frekvenc\u00ed se m\u00edrn\u011b zvy\u0161uje i \u0161umov\u00fd pr\u00e1h, co\u017e je zcela pochopiteln\u00e9:
\n 1500 MHz \u2014 83,5 dB. 2400 MHz \u2014 79,6 dB. P\u0159i 5800 MHz \u2014 66,5 dB.<\/p>\n

M\u011b\u0159en\u00ed zes\u00edlen\u00ed aktivn\u00edho Wi-Fi boosteru na b\u00e1zi modulu XQ-02A.
\n\"Srovn\u00e1vac\u00ed
\n
\nHlavn\u00edm rysem tohoto zesilova\u010de je automatick\u00e9 zapnut\u00ed, kter\u00e9 p\u0159i p\u0159ipojen\u00ed nap\u00e1jen\u00ed okam\u017eit\u011b nezapne zesilova\u010d. Zku\u0161en\u011b jsem pri velk\u00e9m p\u0159\u00edstroji vyzkou\u0161el r\u016fzn\u00e9 atenu\u00e1tory a zjistil prah zapnut\u00ed vestav\u011bn\u00e9 automatiky. Uk\u00e1zalo se, \u017ee zesilova\u010d p\u0159epne do aktivn\u00edho stavu a za\u010dne zesilovat proch\u00e1zej\u00edc\u00ed sign\u00e1l pouze tehdy, pokud je v\u011bt\u0161\u00ed ne\u017e minus 4 dBm (0,4 mW):
\n\"Srovn\u00e1vac\u00ed
\n
\nPro tento test na mal\u00e9m p\u0159\u00edstroji jednodu\u0161e nesta\u010dila v\u00fdstupn\u00ed \u00farove\u0148 vestav\u011bn\u00e9ho gener\u00e1toru, kter\u00fd m\u00e1 zdokumentovan\u00fd v TECH specifikac\u00edch rozsah regulace od minus 15 do minus 25 dBm. A zde bylo pot\u0159eba dokonce minus 4, co\u017e je v\u00fdrazn\u011b v\u00edce ne\u017e minus 15. Ano, bylo by mo\u017en\u00e9 pou\u017e\u00edt extern\u00ed zesilova\u010d, ale \u00fakol byl jin\u00fd.
\n S velk\u00fdm p\u0159\u00edstrojem jsem zm\u011b\u0159il zisk zapnut\u00e9ho zesilova\u010de, uk\u00e1zalo se, \u017ee je 11 dB, i v souladu s TECH specifikacemi.
\nNa mal\u00e9m p\u0159\u00edstroji se mi poda\u0159ilo zjistit \u00farove\u0148 \u00fatlumu vYple\u0161n\u011bn\u00e9ho zesilova\u010de, ale s p\u0159ipojen\u00fdm nap\u00e1jen\u00edm. Uk\u00e1zalo se, \u017ee bez nap\u00e1jen\u00ed zesilova\u010d oslaboval proch\u00e1zej\u00edc\u00ed sign\u00e1l k ant\u00e9n\u011b 12.000kr\u00e1t. Z tohoto d\u016fvodu, jednou kdy\u017e jsem odlet\u011bl a zapomn\u011bl v\u010das nap\u00e1jet extern\u00ed zesilova\u010d, long-range hexacopter let\u011bl 60-70 metr\u016f a zastavil se a p\u0159epnul na automatick\u00fd n\u00e1vrat na m\u00edsto vzletu. Tehdy vznikla pot\u0159eba zjistit \u00farove\u0148 proch\u00e1zej\u00edc\u00edho \u00fatlumu vypnut\u00e9ho zesilova\u010de. Uk\u00e1zalo se, \u017ee je kolem 41-42 dB.<\/p>\n

Gener\u00e1tor \u0161umu 1-3500 MHz
\n\"Srovn\u00e1vac\u00ed
\n
\nJednoduch\u00fd gener\u00e1tor \u0161umu amat\u00e9rsk\u00e9 t\u0159\u00eddy, \u010d\u00ednsk\u00e9 v\u00fdroby.
\nLine\u00e1rn\u00ed porovn\u00e1n\u00ed hodnot v dB je zde pon\u011bkud nepat\u0159i\u010dn\u00e9, vzhledem k neust\u00e1l\u00e9 zm\u011bn\u011b amplitudy na r\u016fzn\u00fdch frekvenc\u00edch, kter\u00e9 zp\u016fsobuje sama povaha \u0161umu.
\nNicm\u00e9n\u011b, z obou p\u0159\u00edstroj\u016f se poda\u0159ilo z\u00edskat velmi podobn\u00e9 srovn\u00e1vac\u00ed grafy kmito\u010dtov\u00fdch charakteristik:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nZde byl rozsah frekvenc\u00ed na p\u0159\u00edstroj\u00edch nastaven stejn\u011b, od 35 do 4000 MHz.
\nA podle amplitudy, jak je vid\u011bt, byly z\u00edsk\u00e1ny tak\u00e9 velmi podobn\u00e9 hodnoty.<\/p>\n

Proch\u00e1zej\u00edc\u00ed kmito\u010dtov\u00e1 charakteristika (m\u011b\u0159en\u00ed S21), filtru LPF 1.4
\nV prvn\u00ed polovin\u011b p\u0159ehledu byl tento filtr ji\u017e zm\u00edn\u011bn. Ale tam se m\u011b\u0159ila jeho VSWR, a zde p\u0159enosov\u00e1 kmito\u010dtov\u00e1 charakteristika, kde je dob\u0159e vid\u011bt, co a s jak\u00fdm \u00fatlumem propou\u0161t\u00ed, a tak\u00e9 kde a kolik o\u0159ez\u00e1v\u00e1.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nZde je podrobn\u011bji vid\u011bt, \u017ee oba p\u0159\u00edstroje t\u00e9m\u011b\u0159 stejn\u00fdm zp\u016fsobem zm\u011b\u0159ily kmito\u010dtovou charakteristiku tohoto filtru:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nNa frekvenci za\u010d\u00e1tku \u00fatlumu 1400 MHz, Arinst uk\u00e1zal amplitudu minus 1,4 dB (modr\u00e1 zna\u010dka Mkr 4), zat\u00edmco GenCom minus 1,79 dB (zna\u010dka M5). <\/p>\n

M\u011b\u0159en\u00ed \u00fatlumu attenu\u00e1tor\u016f<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nPro srovn\u00e1vac\u00ed m\u011b\u0159en\u00ed jsem zvolil nejp\u0159esn\u011bj\u0161\u00ed, zna\u010dkov\u00e9 attenu\u00e1tory. Speci\u00e1ln\u011b ne \u010d\u00ednsk\u00e9, kv\u016fli jejich pom\u011brn\u011b velk\u00fdm odchylk\u00e1m.
\nFrekven\u010dn\u00ed rozsah z\u016fstal stejn\u00fd, od 35 do 4000 MHz. Kalibrace dvojportov\u00e9ho re\u017eimu m\u011b\u0159en\u00ed byla provedena stejn\u011b d\u016fkladn\u011b, s povinnou kontrolou \u010distoty povrchu v\u0161ech kontakt\u016f na p\u0159ipojovan\u00fdch koaxi\u00e1ln\u00edch konektorech. <\/p>\n

V\u00fdsledek kalibrace na \u00farovni 0 dB:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nFrekvence v\u00fdb\u011bru byla nastavena st\u0159edn\u011b, ve st\u0159edu zadan\u00e9ho p\u00e1sma, a to 2009,57 MHz. Po\u010det bod\u016f skenov\u00e1n\u00ed byl tak\u00e9 stejn\u00fd, po 1000+1. <\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nJak je vid\u011bt, v\u00fdsledek m\u011b\u0159en\u00ed t\u00e9ho\u017e kusu attenu\u00e1toru na 40 dB byl sice bl\u00edzk\u00fd, ale trochu se neshodoval. Arinst SSA-TG R2 uk\u00e1zal 42,4 dB, zat\u00edmco GenCom 40,17 dB, za stejn\u00fdch podm\u00ednek. <\/p>\n

Attenu\u00e1tor 30 dB
\n\"Srovn\u00e1vac\u00ed
\n
\nArinst = 31,9 dB
\nGenCom = 30,08 dB
\nPodobn\u011b mal\u00fd rozptyl v procentu\u00e1ln\u00edm vyj\u00e1d\u0159en\u00ed byl z\u00edsk\u00e1n i p\u0159i m\u011b\u0159en\u00ed jin\u00fdch attenu\u00e1tor\u016f. Av\u0161ak pro \u00fasporu \u010dasu \u010dten\u00e1\u0159\u016f a m\u00edsta v \u010dl\u00e1nku, tyto m\u011b\u0159en\u00ed nebyly zahrnuty, nebo\u0165 jsou podobn\u00e1 t\u011bm v\u00fd\u0161e uveden\u00fdm.<\/p>\n

Min a max k\u0159ivka
\nI p\u0159es p\u0159enosnost a zjednodu\u0161en\u00ed p\u0159\u00edstroje v\u00fdrobci p\u0159idali u\u017eite\u010dnou mo\u017enost, jako je v\u00fdstup na indikaci kumulovan\u00fdch minim a maxim m\u011bn\u00edc\u00edch se k\u0159ivek, co\u017e je \u017e\u00e1douc\u00ed p\u0159i r\u016fzn\u00fdch nastaven\u00edch.
\nT\u0159i sn\u00edmky slou\u010den\u00e9 do gif obr\u00e1zku, na p\u0159\u00edkladu LPF filtru p\u00e1sma 5,8 GHz, do jeho\u017e p\u0159ipojen\u00ed byly z\u00e1m\u011brn\u011b zavedeny sp\u00ednac\u00ed interference a ru\u0161en\u00ed:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n\u017dlut\u00e1 k\u0159ivka \u2014 aktu\u00e1ln\u00ed k\u0159ivka krajn\u00edho pr\u016fb\u011bhu skenov\u00e1n\u00ed.
\n\u010cerven\u00e1 k\u0159ivka \u2014 uchovan\u00e9 maxim\u00e1ln\u00ed hodnoty z minul\u00fdch skenov\u00e1n\u00ed.
\nTmav\u011b zelen\u00e1 k\u0159ivka (po zpracov\u00e1n\u00ed a zmen\u0161en\u00ed obr\u00e1zk\u016f \u0161ed\u00e1) \u2014 odpov\u00eddaj\u00edc\u00ed minima A\u010cH.<\/p>\n

M\u011b\u0159en\u00ed VSWR ant\u00e9n
\nJak bylo zm\u00edn\u011bno na za\u010d\u00e1tku p\u0159ehledu, tento p\u0159\u00edstroj m\u00e1 mo\u017enost p\u0159ipojit extern\u00ed sm\u011brov\u00fd odbo\u010dova\u010d (Direct coupler), nebo m\u011b\u0159\u00edc\u00ed most navrhovan\u00fd samostatn\u011b (ale pouze do 2,7 GHz). Programov\u011b je umo\u017en\u011bno prov\u00e1d\u011bt OSL kalibraci, pro ur\u010den\u00ed referen\u010dn\u00edho bodu p\u0159\u00edstroje podle VSWR.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nTady je uk\u00e1z\u00e1n sm\u011brov\u00fd rozd\u011blova\u010d se f\u00e1zov\u011b stabiln\u00edmi m\u011b\u0159ic\u00edmi feederem, kter\u00fd je v\u0161ak od za\u0159\u00edzen\u00ed odpojen po dokon\u010den\u00ed m\u011b\u0159en\u00ed SWR. Je zde v\u0161ak p\u0159edstaven v rozlo\u017een\u00e9 podob\u011b, tak\u017ee si nev\u0161\u00edmejte nesouladu vzhledem k zd\u00e1nliv\u00e9mu p\u0159ipojen\u00ed. Sm\u011brov\u00fd rozd\u011blova\u010d je p\u0159ipojen zleva k p\u0159\u00edstroji, ale v obr\u00e1cen\u00e9 orientaci s ozna\u010den\u00edm sm\u011brem dozadu. Tak pak p\u0159\u00edvod klesaj\u00edc\u00ed vlny z gener\u00e1toru (horn\u00ed port) a sn\u00edm\u00e1n\u00ed odra\u017een\u00e9 na vstup analyz\u00e1toru (doln\u00ed port) bude spr\u00e1vn\u011b.<\/p>\n

Na dvou slou\u010den\u00fdch fotografi\u00edch je uk\u00e1z\u00e1n p\u0159\u00edklad takov\u00e9ho p\u0159ipojen\u00ed a sn\u00edm\u00e1n\u00ed SWR u d\u0159\u00edve zm\u011b\u0159en\u00e9 ant\u00e9ny s kruhovou polarizac\u00ed typu \u201eKlever\u201c v p\u00e1smu 5,8 GHz.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nI kdy\u017e m\u011b\u0159en\u00ed SWR nen\u00ed jedn\u00edm z hlavn\u00edch \u00fa\u010del\u016f tohoto p\u0159\u00edstroje, p\u0159esto se k n\u011bmu (jak ukazuje sn\u00edmek s displeje) vyskytuj\u00ed rozumn\u00e9 ot\u00e1zky. Striktn\u011b dan\u00e1 a nem\u011bnn\u00e1 m\u011b\u0159\u00edtko zobrazen\u00ed grafu SWR s vysokou hodnotou a\u017e 6 jednotek. A\u010dkoliv je na grafu p\u0159ibli\u017en\u011b spr\u00e1vn\u011b zobrazen\u00e1 k\u0159ivka SWR t\u00e9to ant\u00e9ny, v \u010d\u00edseln\u00e9 hodnot\u011b se v\u0161ak z n\u011bjak\u00e9ho d\u016fvodu nezobrazuje p\u0159esn\u00e1 hodnota na markeru, desetin\u00e1 a setinn\u00e1 m\u00edsta nejsou zobrazeny. Zobrazuj\u00ed se pouze cel\u00e9 hodnoty jako 1, 2, 3\u2026 V\u00fdsledek m\u011b\u0159en\u00ed tak trochu z\u016fst\u00e1v\u00e1 nedo\u0159e\u010den\u00fd.
\nI kdy\u017e pro hrub\u00e9 odhady, abyste celkov\u011b pochopili, zda je ant\u00e9na pou\u017eiteln\u00e1 nebo po\u0161kozen\u00e1, je to zcela p\u0159ijateln\u00e1 mo\u017enost. Av\u0161ak jemn\u00e9 nastaven\u00ed p\u0159i pr\u00e1ci s ant\u00e9nou bude slo\u017eit\u011bj\u0161\u00ed, i kdy\u017e zcela mo\u017en\u00e9. <\/p>\n

M\u011b\u0159en\u00ed p\u0159esnosti vestav\u011bn\u00e9ho gener\u00e1toru
\nTak jako u reflektometru, je zde v technick\u00fdch specifikac\u00edch tak\u00e9 uvedeno pouze 2 \u010d\u00edslice p\u0159esnosti za desetinnou \u010d\u00e1rkou.
\nJe p\u0159ece naivn\u00ed o\u010dek\u00e1vat od levn\u00e9ho kapesn\u00edho za\u0159\u00edzen\u00ed p\u0159\u00edtomnost rubidiov\u00e9ho standardu frekvence. *usm\u00edvaj\u00edc\u00ed se smajl\u00edk*
\nNicm\u00e9n\u011b, zv\u00eddav\u00e9mu \u010dten\u00e1\u0159i jist\u011b poskytne zaj\u00edmav\u00e9 informace o velikosti chyby takto miniaturizovan\u00e9ho gener\u00e1toru. Vzhledem k tomu, \u017ee kalibrovan\u00fd p\u0159esn\u00fd frekven\u010dn\u00ed \u010d\u00edta\u010d byl dostupn\u00fd pouze do 250 MHz, bylo provedeno m\u011b\u0159en\u00ed na \u010dty\u0159ech frekvenc\u00edch na spodn\u00ed \u010d\u00e1sti spektra, abychom pochopili trend chyby, pokud by byl zji\u0161t\u011bn. Je t\u0159eba poznamenat, \u017ee byly po\u0159\u00edzeny fotografie i p\u0159i vy\u0161\u0161\u00edch frekvenc\u00edch z jin\u00e9ho za\u0159\u00edzen\u00ed. Pro \u00fasporu m\u00edsta v \u010dl\u00e1nku v\u0161ak nebyly zahrnuty, proto\u017ee potvrzuj\u00ed numericky stejnou propor\u010dn\u00ed velikost chyby v ni\u017e\u0161\u00edch \u0159\u00e1dech.<\/p>\n

\u010cty\u0159i fotografie na \u010dty\u0159ech frekvenc\u00edch byly shrom\u00e1\u017ed\u011bny do gif obr\u00e1zku, takt\u00e9\u017e pro \u00fasporu m\u00edsta: 50,00; 100,00; 150,00 a 200,00 MHz.
\n\"Srovn\u00e1vac\u00ed
\n
\nJe jasn\u011b vid\u011bt trend a velikost existuj\u00edc\u00ed chyby:
\n50,00 MHz m\u00e1 men\u0161\u00ed p\u0159ekro\u010den\u00ed frekvence gener\u00e1toru, a to konkr\u00e9tn\u011b o 954 Hz.
\n100,00 MHz m\u00e1 odpov\u00eddaj\u00edc\u00edm zp\u016fsobem o n\u011bco v\u00edce, +1,79 kHz.
\n150,00 MHz m\u00e1 je\u0161t\u011b v\u00edce, +1,97 kHz.
\n200,00 MHz, +3,78 kHz.<\/p>\n

D\u00e1le byla frekvence m\u011b\u0159ena analyz\u00e1torem GenCom, kter\u00fd m\u011bl dobr\u00fd frekven\u010dn\u00ed \u010d\u00edta\u010d. Nap\u0159\u00edklad, pokud vestav\u011bn\u00fd gener\u00e1tor v GenCom nedok\u00e1zal dodat 800 Hz na frekvenci 50,00 MHz, uk\u00e1zal to nejen extern\u00ed frekven\u010dn\u00ed \u010d\u00edta\u010d, ale i samotn\u00fd spektr\u00e1ln\u00ed analyz\u00e1tor nam\u011b\u0159il p\u0159esn\u011b tuto hodnotu:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nD\u00e1le jedna z fotografi\u00ed displeje s nam\u011b\u0159enou frekvenc\u00ed vestav\u011bn\u00e9ho gener\u00e1toru v SSA-TG R2, na p\u0159\u00edkladu st\u0159edn\u00ed frekvence Wi-Fi p\u00e1sma 2450 MHz:
\n\"Srovn\u00e1vac\u00ed
\n
\nPro zkr\u00e1cen\u00ed m\u00edsta v \u010dl\u00e1nku jsem tak\u00e9 nezve\u0159ejnil ostatn\u00ed podobn\u00e9 fotografie displeje, m\u00edsto nich stru\u010dn\u00e9 shrnut\u00ed v\u00fdsledk\u016f m\u011b\u0159en\u00ed na frekvenc\u00edch nad 200 MHz:
\nNa frekvenci 433,00 MHz bylo p\u0159ekro\u010den\u00ed +7,92 kHz.
\nNa frekvenci 1200,00 MHz, = +22,4 kHz.
\nNa frekvenci 2450,00 MHz, = +42,8 kHz (na p\u0159edchoz\u00ed fotografii).
\nNa frekvenci 3999,50 MHz, = +71,6 kHz.
\nNicm\u00e9n\u011b, uveden\u00e9 tov\u00e1rn\u00ed specifikace s dv\u011bma m\u00edsty za desetinnou \u010d\u00e1rkou jsou ve v\u0161ech p\u00e1smech p\u0159esn\u011b dodr\u017eeny.<\/p>\n

Srovn\u00e1n\u00ed m\u011b\u0159en\u00ed amplitudy sign\u00e1lu.
\nNa n\u00e1sleduj\u00edc\u00edm gif obr\u00e1zku je shrom\u00e1\u017ed\u011bno 6 fotografi\u00ed, na kter\u00fdch analyz\u00e1tor Arinst SSA-TG R2 m\u011b\u0159\u00ed sv\u016fj vlastn\u00ed gener\u00e1tor na n\u00e1hodn\u011b vybran\u00fdch \u0161esti frekvenc\u00edch.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n50 MHz -8,1 dBm; 200 MHz -9,0 dBm; 1000 MHz -9,6 dBm;
\n 2500 MHz -9,1 dBm; 3999 MHz -5,1 dBm; 5800 MHz -9,1 dBm.
\nA\u010dkoliv je maxim\u00e1ln\u00ed amplituda gener\u00e1toru ud\u00e1v\u00e1na jako ne v\u00edce ne\u017e minus 15 dBm, p\u0159i m\u011b\u0159en\u00ed jsou viditeln\u00e9 jin\u00e9 hodnoty.
\nPro zji\u0161t\u011bn\u00ed p\u0159\u00ed\u010din takov\u00e9 indikace amplitudy byla provedena m\u011b\u0159en\u00ed s gener\u00e1torem Arinst SSA-TG R2, na precizn\u00edm senzoru Anritsu MA24106A, s kalibra\u010dn\u00edm nulov\u00e1n\u00edm na slad\u011bn\u00e9 z\u00e1t\u011b\u017ei p\u0159ed zah\u00e1jen\u00edm m\u011b\u0159en\u00ed. Tak\u00e9 bylo poka\u017ed\u00e9 zad\u00e1no hodnoty frekvence pro p\u0159esnost m\u011b\u0159en\u00ed s ohledem na koeficienty podle vestav\u011bn\u00e9 tov\u00e1rn\u00ed korek\u010dn\u00ed tabulky pro frekvenci a teplotu.<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\n35 MHz -9,04 dBm; 200 MHz -9,12 dBm; 1000 MHz -9,06 dBm;
\n 2500 MHz -8,96 dBm; 3999 MHz -7,48 dBm; 5800 MHz -7,02 dBm
\nJak je vid\u011bt, hodnoty amplitudy sign\u00e1lu vyd\u00e1van\u00e9ho vestav\u011bn\u00fdm gener\u00e1torem SSA-TG R2, analyz\u00e1tor m\u011b\u0159\u00ed velmi slu\u0161n\u011b (pro amat\u00e9rskou t\u0159\u00eddu p\u0159esnosti). A amplituda gener\u00e1toru zobrazen\u00e1 ve spodn\u00ed \u010d\u00e1sti displeje p\u0159\u00edstroje se ukazuje jako \"narysovan\u00e1\", proto\u017ee skute\u010dn\u011b vyd\u00e1v\u00e1 vy\u0161\u0161\u00ed \u00farove\u0148, ne\u017e by m\u011bla, v regulovan\u00fdch mez\u00edch od -15 do -25 dBm. <\/p>\n

Vzhledem k obav\u011b, \u017ee by nov\u00fd senzor Anritsu MA24106A nemusel fungovat spr\u00e1vn\u011b, bylo provedeno srovn\u00e1n\u00ed s jin\u00fdm laboratorn\u00edm syst\u00e9mov\u00fdm analyz\u00e1torem od General Dynamics, model R2670B.
\n\"Srovn\u00e1vac\u00ed
\n
\nAle ne, odchylka v amplitud\u011b se uk\u00e1zala b\u00fdt docela mal\u00e1, v mez\u00edch 0,3 dBm.<\/p>\n

M\u011b\u0159i\u010d v\u00fdkonu GenCom 747A tak\u00e9 neuk\u00e1zal velk\u00e9 p\u0159ekro\u010den\u00ed \u00farovn\u011b z gener\u00e1toru:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nAle na \u00farovni 0 dBm analyz\u00e1tor Arinst SSA-TG R2 z nezn\u00e1m\u00e9ho d\u016fvodu m\u00edrn\u011b p\u0159ekro\u010dil amplitudov\u00e9 hodnoty, a to z r\u016fzn\u00fdch sign\u00e1ln\u00edch zdroj\u016f s 0 dBm.
\n\"Srovn\u00e1vac\u00ed
\n
\nP\u0159i tom senzor Anritsu MA24106A ukazuje 0,01 dBm od kalibr\u00e1toru Anritsu ML4803A.
\n\"Srovn\u00e1vac\u00ed
\n
\nOvl\u00e1d\u00e1n\u00ed velikosti \u00fatlumu atenu\u00e1toru na dotykov\u00e9 obrazovce prstem se uk\u00e1zalo jako nelichotiv\u011b nepohodln\u00e9, proto\u017ee seznam se \u010dasto posunuje, nebo se vrac\u00ed na krajn\u00ed hodnotu. Uk\u00e1zalo se, \u017ee je pohodln\u011bj\u0161\u00ed a p\u0159esn\u011bj\u0161\u00ed pou\u017e\u00edt starom\u00f3dn\u00ed stylus:
\n\"Srovn\u00e1vac\u00ed
\n
\nP\u0159i p\u0159ehr\u00e1v\u00e1n\u00ed harmonick\u00fdch n\u00edzkofrekven\u010dn\u00edho sign\u00e1lu 50 MHz t\u00e9m\u011b\u0159 v cel\u00e9m pracovn\u00edm p\u00e1smu analyz\u00e1toru (a\u017e do 4 GHz) se objevila ur\u010dit\u00e1 \"anom\u00e1lie\" na frekvenc\u00edch kolem 760 MHz:
\n\"Srovn\u00e1vac\u00ed
\n
\nP\u0159i \u0161ir\u0161\u00edm horn\u00edm p\u00e1sem frekvenc\u00ed (a\u017e 6035 MHz), aby Span byl p\u0159esn\u011b 6000 MHz, je anom\u00e1lie tak\u00e9 viditeln\u00e1:
\n\"Srovn\u00e1vac\u00ed
\n
\nP\u0159i\u010dem\u017e tento stejn\u00fd sign\u00e1l z tohoto stejn\u00e9ho vestav\u011bn\u00e9ho gener\u00e1toru v SSA-TG R2, kdy\u017e je p\u0159iveden na jin\u00fd p\u0159\u00edstroj, nem\u00e1 \u017e\u00e1dnou takovou anom\u00e1lii:
\n\"Srovn\u00e1vac\u00ed
\n
\nJeliko\u017e na jin\u00e9m analyz\u00e1toru nebyla tato anom\u00e1lie zaznamen\u00e1na, znamen\u00e1 to, \u017ee probl\u00e9m nen\u00ed v gener\u00e1toru, ale v analyz\u00e1toru spektra. <\/p>\n

Vestav\u011bn\u00fd atenu\u00e1tor pro oslaben\u00ed amplitudy gener\u00e1toru jasn\u011b oslabuje po kroc\u00edch 1 dB ve v\u0161ech sv\u00fdch 10 stupn\u00edch. N\u00ed\u017ee na obrazovce je dob\u0159e viditeln\u00fd stup\u0148ov\u00fd z\u00e1znam na \u010dasov\u00e9 ose, kter\u00fd ukazuje funk\u010dnost atenu\u00e1toru:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nNechal jsem p\u0159ipojen\u00fd v\u00fdstupn\u00ed port gener\u00e1toru a vstupn\u00ed port analyz\u00e1toru, p\u0159\u00edstroj jsem vypnul. N\u00e1sleduj\u00edc\u00ed den p\u0159i zapnut\u00ed jsem zjistil sign\u00e1l s norm\u00e1ln\u00edmi harmonick\u00fdmi na zaj\u00edmav\u00e9 frekvenci 777,00 MHz:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nP\u0159itom byl gener\u00e1tor ponech\u00e1n vypnut\u00fd. Po kontrole menu se uk\u00e1zalo, \u017ee skute\u010dn\u011b je vypnut\u00fd. V z\u00e1sad\u011b by na v\u00fdstupu gener\u00e1toru nem\u011bl b\u00fdt \u017e\u00e1dn\u00fd sign\u00e1l, pokud byl p\u0159ede\u0161l\u00e9ho dne vypnut. Bylo nutn\u00e9 v menu gener\u00e1toru zapnout jakoukoli frekvenci a hned ji zase vypnout. Po tomto kroku podivn\u00e1 frekvence zmizela a znovu se neobjev\u00ed, ale pouze do doby dal\u0161\u00edho zapnut\u00ed cel\u00e9ho p\u0159\u00edstroje. Ur\u010dit\u011b v n\u00e1sleduj\u00edc\u00ed firmwarov\u00e9 aktualizaci v\u00fdrobce tento probl\u00e9m automatick\u00e9ho zap\u00edn\u00e1n\u00ed vy\u0159e\u0161\u00ed, pokud je gener\u00e1tor vypnut\u00fd. Ale pokud mezi porty nen\u00ed kabel, nen\u00ed zcela patrn\u00e9, \u017ee n\u011bco nen\u00ed v po\u0159\u00e1dku, snad jen \u00farove\u0148 \u0161umu je o n\u011bco vy\u0161\u0161\u00ed. A po nucen\u00e9m zapnut\u00ed a vypnut\u00ed gener\u00e1toru se \u00farove\u0148 \u0161umu m\u00edrn\u011b sni\u017euje, ale jen na m\u00e1lo znatelnou hodnotu. To je drobn\u00e9 provozn\u00ed m\u00ednus, jeho\u017e \u0159e\u0161en\u00ed zabere nav\u00edc 3 sekundy po zapnut\u00ed p\u0159\u00edstroje.<\/p>\n

Vnit\u0159n\u00ed uspo\u0159\u00e1d\u00e1n\u00ed Arinst SSA-TG R2 je uk\u00e1z\u00e1no na t\u0159ech fotografi\u00edch spojen\u00fdch v gif:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nSrovn\u00e1n\u00ed rozm\u011br\u016f se star\u00fdm spektrometrem Arinst SSA Pro, na kter\u00e9m je naho\u0159e smartphone jako displej:<\/p>\n

\"Srovn\u00e1vac\u00ed
\n
\nPlusy:
\nStejn\u011b jako v p\u0159\u00edpad\u011b p\u0159edchoz\u00edho reflektometru Arinst VR 23-6200, je zde uveden\u00fd analyz\u00e1tor Arinst SSA-TG R2 ve stejn\u00e9m form\u00e1tu a rozm\u011brech, kompaktn\u00edm, ale dostate\u010dn\u011b seri\u00f3zn\u00edm pomocn\u00edkem pro r\u00e1dioamat\u00e9ra. Tak\u00e9 nevy\u017eaduje, na rozd\u00edl od minul\u00fdch model\u016f SSA, extern\u00ed displeje na po\u010d\u00edta\u010di nebo smartphonu.
\nVelmi \u0161irok\u00e9, cel\u00e9 a nep\u0159eru\u0161ovan\u00e9 p\u00e1smo frekvenc\u00ed, od 35 do 6200 MHz.
\nP\u0159esn\u00fd \u010das provozu na baterie jsem nezkoumal, ale kapacita vestav\u011bn\u00e9 lithium-iontov\u00e9 baterie sta\u010d\u00ed na del\u0161\u00ed dobu autonomn\u00edho provozu.
\nPom\u011brn\u011b mal\u00e1 chyba v m\u011b\u0159en\u00edch pro takto kompaktn\u00ed p\u0159\u00edstroj. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b je pro amat\u00e9rskou \u00farove\u0148 v\u00edce ne\u017e dostate\u010dn\u00e1.
\nPodporuje v\u00fdrobce jak firmware, tak fyzick\u00e9 opravy, pokud to bude pot\u0159eba. Ji\u017e je \u0161iroce dostupn\u00fd k zakoupen\u00ed, tedy ne na objedn\u00e1vku, jako tomu n\u011bkdy b\u00fdv\u00e1 u jin\u00fdch v\u00fdrobc\u016f. <\/p>\n

Byly tak\u00e9 zaznamen\u00e1ny nedostatky:
\nNezohledn\u011bn\u00e9 a nedokumentovan\u00e9, samovoln\u00e9 v\u00fdstupy sign\u00e1lu gener\u00e1toru s frekvenc\u00ed 777,00 MHz. Takov\u00e9 nedorozum\u011bn\u00ed bude jist\u011b odstran\u011bno dal\u0161\u00edm firmwarem. A\u010dkoliv pokud v\u00edte o t\u00e9to vlastnosti, d\u00e1 se ji snadno odstranit za 3 sekundy jednoduch\u00fdm zapnut\u00edm a vypnut\u00edm vestav\u011bn\u00e9ho gener\u00e1toru.
\nNa dotykov\u00fd displej si je t\u0159eba trochu zvyknout, proto\u017ee ne v\u0161echny virtu\u00e1ln\u00ed tla\u010d\u00edtka se okam\u017eit\u011b aktivuj\u00ed, kdy\u017e je posunete slidery. Ale pokud se slidery neposunuj\u00ed a rovnou se klikne na kone\u010dn\u00e9 m\u00edsto, v\u0161e funguje okam\u017eit\u011b p\u0159esn\u011b. To nen\u00ed sp\u00ed\u0161e nedostatek, ale sp\u00ed\u0161 \"specifika\" vykreslen\u00fdch ovl\u00e1dac\u00edch prvk\u016f, konkr\u00e9tn\u011b v menu gener\u00e1toru a ovl\u00e1d\u00e1n\u00ed atenu\u00e1toru.
\n P\u0159i p\u0159ipojen\u00ed p\u0159es Bluetooth se analyz\u00e1tor jakoby \u00fasp\u011b\u0161n\u011b p\u0159ipojuje k chytr\u00e9mu telefonu, ale graf A\u010cH se nezobrazuje, jako nap\u0159\u00edklad u zastaral\u00e9ho SSA Pro. P\u0159i p\u0159ipojen\u00ed byla pln\u011b dodr\u017eena v\u0161echna po\u017eadavky uveden\u00e9 v \u010d\u00e1sti 8 v\u00fdrobn\u00edho n\u00e1vodu.
\nNapadlo m\u011b, \u017ee pokud heslo funguje, na obrazovce chytr\u00e9ho telefonu se zobrazuje potvrzen\u00ed o spojen\u00ed, mo\u017en\u00e1 je tato funkce ur\u010dena pouze pro upgrade firmware p\u0159es chytr\u00fd telefon.
\nAle ne.
\nV bod\u011b pokyn\u016f 8.2.6 je jasn\u011b uvedeno:
\n8.2.6. Dojde k p\u0159ipojen\u00ed p\u0159\u00edstroje k tabletu\/chytr\u00e9mu telefonu, na obrazovce se zobraz\u00ed graf spektra sign\u00e1lu a informa\u010dn\u00ed zpr\u00e1va o p\u0159ipojen\u00ed k za\u0159\u00edzen\u00ed ConnectedtoARINST_SSA, jak je zn\u00e1zorn\u011bno na obr\u00e1zku 28. (c)
\nAno, potvrzen\u00ed se objevuje, ale stopa \u2014 ne.
\nOpakovan\u011b jsem se p\u0159ipojoval, ale stopa se poka\u017ed\u00e9 neobjevila. A se star\u00fdm SSA Pro se to okam\u017eit\u011b objevilo.
\nDal\u0161\u00ed z nedostatk\u016f ohledn\u011b proklamovan\u00e9 \"univerz\u00e1lnosti\", kv\u016fli omezen\u00ed na doln\u00edm okraji pracovn\u00edch frekvenc\u00ed, nejsou vhodn\u00e9 pro radioamat\u00e9ry kr\u00e1tkovlnn\u00e9. Naopak pro RC FPV pln\u011b uspokojuj\u00ed po\u017eadavky jak amat\u00e9r\u016f, tak profesion\u00e1l\u016f, dokonce s p\u0159ebytkem.<\/p>\n

Z\u00e1v\u011bry:
\nCelkov\u011b oba p\u0159\u00edstroje zanechaly velmi pozitivn\u00ed dojem, nebo\u0165 v podstat\u011b p\u0159edstavuj\u00ed kompletn\u00ed m\u011b\u0159ic\u00ed komplex, alespo\u0148 na \u00farovni pokro\u010dil\u00fdch amat\u00e9rsk\u00fdch radioamat\u00e9r\u016f. Ceny zde nejsou p\u0159edm\u011btem zkoum\u00e1n\u00ed, nicm\u00e9n\u011b jsou znateln\u011b ni\u017e\u0161\u00ed ne\u017e u dal\u0161\u00edch bl\u00edzk\u00fdch analog\u016f na trhu v tak \u0161irok\u00e9m a nep\u0159etr\u017eit\u00e9m p\u00e1smu frekvenc\u00ed, co\u017e mus\u00ed pot\u011b\u0161it.
\nC\u00edlem recenze bylo jednodu\u0161e porovnat tato za\u0159\u00edzen\u00ed s pokro\u010dilej\u0161\u00edmi m\u011b\u0159ic\u00edmi p\u0159\u00edstroji a poskytnout \u010dten\u00e1\u0159\u016fm fotograficky zdokumentovan\u00e1 m\u011b\u0159en\u00ed displej\u016f, aby si mohli utvo\u0159it vlastn\u00ed n\u00e1zor a nez\u00e1visle se rozhodnout o mo\u017enosti zakoupen\u00ed. V \u017e\u00e1dn\u00e9m p\u0159\u00edpad\u011b nebyly sledov\u00e1ny \u017e\u00e1dn\u00e9 reklamn\u00ed c\u00edle. Jen nez\u00e1visl\u00e9 hodnocen\u00ed a publikace v\u00fdsledk\u016f pozorov\u00e1n\u00ed.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27625,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Srovn\u00e1vac\u00ed recenze p\u0159enosn\u00fdch mikrovlnn\u00fdch p\u0159\u00edstroj\u016f Arinst vs Anritsu | ProHoster","description":"Na nez\u00e1visl\u00e9m testu a 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