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tanpri Klike la ajwenn antèn dipol nou
1, dbm
dbm se yon pouvwa nan egzamen siy ki gen valè absoli se kalkile kòm: 10lgP (valè pouvwa / 1mw).
[Egzanp 1] Si transmisyon pouvwa P a se 1mw, konvèti nan dbm apre 0dBm.
[Egzanp 2] pou 40W ki gen pouvwa, selon valè a dbm nan inite apre konvèsyon yo ta dwe:
10lg (40W / 1mw) = 10lg (40000) = 10lg4 + 10 lg10 + 10 lg1000 = 46dBm.
2, dbi ak DBD
dbi ak DBD se valè a genyen nan karakteristik tès (genyen pouvwa), tou de kote yo yon valè relatif, men se pa pwen an referans menm. yon referans nan dbi Omni-direksyon antèn, DBD pwen referans pou dipol a, se konsa de nan yo se yon ti kras diferan. Anjeneral kwè ke benefis la menm, reprezante pa dbi DBD pase sa ki soti nan yon gwo 2.15.
[Egzanp 3] Pou bò a nan benefis la antèn nan 16dBd li yo konvèti nan inite nan dbi benefis lè yo konpare 18.15dBi (jeneralman inyore kote desimal, kòm 18dBi).
[Egzanp 4] 0dBd = 2.15dBi.
[Egzanp 5] GSM900 genyen antèn ka 13dBd (15dBi), GSM1800 genyen antèn ka 15dBd (17dBi).
3, dB
dB se yon karakterizasyon ki gen valè nan fanmi ki gen valè nan, lè w ap konsidere pouvwa a konpare ak yon B oswa yon ti kantite gwo dB pouvwa, dapre fòmil sa a: 10lg (A pouvwa pouvwa / B)
[Egzanp 6] AB pouvwa pase doub pouvwa a, lè sa a 10lg (A pouvwa pouvwa / B) = 10lg2 = 3dB. Nan lòt mo, yon pouvwa pi gwo pase B pouvwa a 3 dB.
[Egzanp 7] 7 / 8 pous GSM900 feeder pèt transmisyon nan sou 100 mèt nan 3.9dB.
[Egzanp 8] Si yon pouvwa se 46dBm, pouvwa B a nan 40dBm, li kapab te di ke yon gwo B pase 6 dB.
[Egzanp 9] Si yon antèn 12dBd, B antèn 14dBd, B kapab yon ti kras plis pase 2 dB.
4, DBC
Pafwa wè DBC, li se tou yon valè manm fanmi an te di inite pouvwa, ak dB se kalkile ekzakteman menm bagay la. An jeneral, DBC relatif nan konpayi asirans lan (konpayi asirans) an tèm de pouvwa a, nan anpil ka, itilize yo mezire valè relatif la ki gen pouvwa a konpayi asirans, tankou sèvi ak mezi entèferans (ko-chanèl entèferans, entèrmodulasyon entèferans, dyafoni, ak entèferans deyò, elatriye) kòm byen ke kouti, pèdi epi se konsa valè a manm fanmi. Mete nan itilize nan DBC, nan prensip, ka sèvi tou ak dB pito.
http://di-an.com.cn/news/article.php?articleid=107
Eksperyans algorithm:
Gen yon fòmil senp: 0dbm = 0.001w nan kite nan dwa pou pa 10 = 10
Se poutèt sa, 0 + 10 dbm = 0.001 * 10W ki 10DBM = 0.01W
Li ka Se poutèt sa 20DBM = 0.1W 30DBM = 1W 40DBM = 10W
Gen nan kite nan dwa pou pa 3 = 2, tankou 40 + 3 dbm = 10 * 2W, ki 43DBM = 20W, ki se fòmil la anpirik, amann itilize yo.
So-50DBM = 0DBM-10-10-10-10-10 = 1mw/10/10/10/10/10 = 0.00001mw.
tanpri Klike la ajwenn antèn dipol nou
lòt pwodwi nou an:
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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
it.fmuser.org -> Italyen
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no.fmuser.org -> Norwegian
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yi.fmuser.org -> Yiddish
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