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1. Prensip FM
FM (frekans modulation) vle di modulation frekans. Li se òdinè yo sèvi ak FM, al gade nan jeneral FM difize (76-108MHz, 87-108MHz nan Lachin, 76-90MHz nan Japon), an reyalite FM se tou yon metòd modulation, menm nan seri a onn kout ant 27-30MHz, Kòm yon bann yo itilize pou radyo amatè, espas, ak kominikasyon satelit, genyen tou frekans modulation (FM) metòd. Radyo FM se radyo FM.
Chanjman siyal odyo yo souvan siklik. Youn nan egzanp ki pi fasil nan teknik modulation odyo yo konprann se violon an ak fisèl vibre. Fisèl la vibre rapidman sou strings yo nan dwèt ak ponyèt, sa ki lakòz chanjman rapid nan longè fisèl yo, ki finalman afekte son violon an. Dousè a. Tankou "vag radyo FM", "FM sentèz teyori" tou te gen de eleman: kò son (konpayi asirans) ak kò modulation. Kò a son, oswa kò konpayi asirans lan, se osilator a frekans ki aktyèlman emèt son an; modulateur a, oswa modulateur, ki responsab pou ajiste son an ki te pwodwi pa chanje vag la konpayi asirans lan. Frekans konpayi asirans, frekans modulation ak valè modulation yo se faktè enpòtan ki afekte teyori sentèz FM.
FMinstrument ki pi fondamantal gen ladan de osilateur sinusoidal, yon sèl se yon frekans ki estab frekans fc (CarrierFrequnecy) osilateur; lòt la se yon frekans modulation FM (ModulationFrequency) osilateur. Se frekans lan konpayi asirans ajoute nan pwodiksyon an nan osilateur a modulation. Osilator konpayi asirans lan se yon frekans vag sinis senp ak frekans fc. Lè modulateur a rive, siyal ki soti nan osilator modulation, se sa ki, vag sinis ak frekans FM, kondui frekans osilator konpayi asirans lan pou chanje monte oswa desann. Pou egzanp, yon vag sinis 250Hz modulation vag modulation yon konpayi asirans vag sinus 1000Hz, ki vle di ke frekans lan 1000Hz ki te pwodwi pa konpayi asirans lan pral sibi 250 modulasyon pou chak dezyèm. Tou de kò a sistèm ak kò a konpayi asirans yo se peryodik oswa kazi-peryodik osilateur ak frekans, anplitid, ak fòm.
Nan teknoloji modulation frekans, anplitid kò modulation la jwe tou yon wòl kle nan modulation frekans. Anplitid la nan kò a modulation afekte pwofondè nan chanjman apre modulation nan frekans lan konpayi asirans lan. Si anplitid siyal la modulation se 0, pa gen okenn modulation ap fèt. Se poutèt sa, Tankou nan modulation anplitid (AM), frekans nan kò a modulation gen yon efè sou anplitid la nan kò a konpayi asirans, nan modulation frekans (FM), se chanjman nan frekans nan konpayi asirans lan tou ki afekte nan anplitid la nan modulation la kò.
2. Prensip radyo AM:
Radyo AM la konsiste de yon bouk opinyon, yon bouk osilateur lokal yo, yon sikwi melanje, yon sikwi deteksyon, yon sikwi kontwòl otomatik genyen (AGC) ak yon sikwi anplifikatè odyo pouvwa, jan yo montre nan Figi 1-1.
Se kous la opinyon ki konpoze de yon bobin antèn ak yon CAPACITOR varyab. Se sikwi osilasyon lokal la ki konpoze de yon bobin osilasyon lokal ak yon kondansateur varyab. Siyal osilasyon lokal la melanje ak siyal opinyon nan yon mixer entèn yo. Siyal frekans melanje a jwenn nan bouk seleksyon entèmedyè frekans ki fòme pa frekans entèmedyè a ak filtre seramik 455kHz la. Nan pwen sa a, te siyal la nan estasyon radyo a vin yon anplitid vag modulation ak yon frekans entèmedyè nan 455kHz kòm konpayi asirans lan.
Siyal frekans entèmedyè a anplifye pa frekans entèmedyè a, epi lè sa a siyal odyo a jwenn nan deteksyon an, epi pwodiksyon an anplifye pa pouvwa a, makonnen ak oratè a, epi retabli son an. Pami yo, se genyen an nan sikwi a anplifikatè entèmedyè kontwole pa AGC otomatik kontwòl genyen an kenbe ajisteman otomatik nan genyen an lè siyal la radyo se diferan yo jwenn yon efè koute ki konsistan.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org -> Afriken
sq.fmuser.org -> Albanyen
ar.fmuser.org -> Arab
hy.fmuser.org -> Armenian
az.fmuser.org -> Azerbaydjan
eu.fmuser.org -> Basque
be.fmuser.org -> Belarisyen
bg.fmuser.org -> Bulgarian
ca.fmuser.org -> Katalan
zh-CN.fmuser.org -> Chinwa (senplifye)
zh-TW.fmuser.org -> Chinwa (Tradisyonèl)
hr.fmuser.org -> Kwoasyen
cs.fmuser.org -> Czech
da.fmuser.org -> Danwa
nl.fmuser.org -> Olandè
et.fmuser.org -> Estonyen
tl.fmuser.org -> Filipino
fi.fmuser.org -> Finnish
fr.fmuser.org -> Franse
gl.fmuser.org -> Galisyen
ka.fmuser.org -> Georgian
de.fmuser.org -> Alman
el.fmuser.org -> Greek
ht.fmuser.org -> Kreyòl ayisyen
iw.fmuser.org -> ebre
hi.fmuser.org -> Hindi
hu.fmuser.org -> Hungarian
is.fmuser.org -> Icelandic
id.fmuser.org -> Endonezyen
ga.fmuser.org -> Ilandè
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no.fmuser.org -> Norwegian
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pl.fmuser.org -> Polonè
pt.fmuser.org -> Pòtigè
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sr.fmuser.org -> Sèb
sk.fmuser.org -> Slovak
sl.fmuser.org -> Slovenian
es.fmuser.org -> Panyòl
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tr.fmuser.org -> Tik
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yi.fmuser.org -> Yiddish
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