Ha re shebane le pontšo ea morero oa moralo oa RF, le leng la mantsoe a tloaelehileng ke "dB". Bakeng sa moenjiniere oa RF, dB ka linako tse ling e tloaelehile joalo ka lebitso la eona. dB ke yuniti ea logarithmic e fanang ka mokhoa o bonolo oa ho hlahisa likarolelano, joalo ka karo-karolelano lipakeng tsa lets'oao le kenang le lets'oao le tsoang.
Kaha dB ke karolelano, ke yuniti e lekanyelitsoeng, eseng e felletseng. Matla a pontšo a lekantsoe ka ho feletseng, hobane kamehla re re phapang e ka bang teng, ke hore, phapang e ka bang teng pakeng tsa lintlha tse peli; Hangata re bua ka bokhoni ba node e amanang le node ea fatše ea 0 V. Nako ea lets'oao le eona e lekantsoe ka botlalo, kaha yuniti (ampere) e kenyelletsa tefiso e itseng bakeng sa nako e itseng. Ka lehlakoreng le leng, dB ke yuniti e kenyelletsang logarithm ea karolelano lipakeng tsa linomoro tse peli. Mohlala, phaello ea amplifier: Haeba matla a lets'oao la ho kenya ke 1 W mme matla a lets'oao la tlhahiso ke 5 W, karolelano ke 5, e fetolelang ho dB ke 6.9897dB.
Ka hona, amplifier e fana ka phaello ea matla ea 7dB, ke hore, karo-karolelano lipakeng tsa matla a lets'oao le matla a lets'oao le ka hlahisoang e le 7dB.
Hobaneng u sebelisa dB?
Ka sebele hoa khoneha ho rala le ho leka lits'ebetso tsa RF ntle le ho sebelisa dB, empa bonneteng, dB e fumaneha hohle. Molemo o mong ke hore tekanyo ea dB e re lumella ho hlahisa litekanyo tse kholo haholo ntle le ho sebelisa linomoro tse kholo haholo: 1,000,000 e na le phaello ea matla ea 60dB feela. Ho phaella moo, kakaretso ea phaello kapa tahlehelo ea ketane ea matšoao e sebakeng sa dB 'me ho bonolo ho e bala hobane linomoro tsa motho ka mong tsa dB li kenyelletsoa feela (athe ha re sebelisa likarohano tse tloaelehileng, ho atisa ho hlokahala).
Molemo o mong ke seo re se tsebang ho tsoa phihlelong ea li-filters. Litsamaiso tsa RF li potoloha maqhubu le mekhoa e fapaneng eo maqhubu a hlahisoang, a laoloang, kapa a angoang ke likarolo le likaroloana tsa potoloho ea parasitic. Sekala sa dB se loketse moelelong o joalo hobane morero oa karabelo oa khafetsa o bonolo ebile o na le tsebo ea pono ha axis ea frequency e sebelisa sekala sa logarithmic mme amplitude axis e sebelisa sekala sa dB.
Ka hona, ha ho etsoa moralo oa filthara, ho hlokahala hore u be hlokolosi haholo.
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Nako ea poso: Mar-04-2022
