Yuav tsum kav hlau txais xov fm yog ntsug lossis kab rov tav?

Cov txheej txheem:

Yuav tsum kav hlau txais xov fm yog ntsug lossis kab rov tav?
Yuav tsum kav hlau txais xov fm yog ntsug lossis kab rov tav?
Anonim

FM signals yog Ameslikas horizontalally polarized (Hpol), tab sis tam sim no, ncig polarization (Cpol) yog siv yuav luag nkaus xwb. Qee zaum, cov teeb liab sib cais muab los ntawm ntsug piv rau kab rov tav polarization yog siv los tiv thaiv kev cuam tshuam ntawm NCE chaw nres tsheb.

Puas yog tus kav hlau txais xov ncaj nraim ntawm lub xov tooj cua yuav ntsug lossis kab rov tav?

Cov nthwv dej uas muaj hluav taws xob los ntawm cov xaim ncaj nraim uas yog taw qhia vertically yuav taug kev yuav txav mus rau hauv av nyob rau hauv txoj kab rov tav. Yog tias lub kav hlau txais xov ntawm qhov kawg tau txais, muab tso rau hauv vertically ces nws yuav tau txais cov cim zoo dua thiab ntau yam nthwv dej tuaj yeem tau txais sai sai.

Puas yog FM antennas directional?

Nyob rau hauv lub ntsiab lus, uas txhais tau hais tias txhua tus xov tooj cua FM yog lub kav hlau txais xov qhia, tsawg kawg rau qee qhov. Qhov ntawd yog qhov tshwm sim paub zoo thiab FCC yeej paub txog nws. Lub chaw haujlwm tseem faib cov kav hlau txais xov FM tsis yog kev taw qhia uas tsis yog "kev taw qhia" nrog cov kab mob parasitic radiators thiab lwm yam khoom siv.

Yuav tsum kav hlau txais xov ntsug?

Kav hlau txais xov yuav tsum txhua qhov taw qhia ntsug thiab cov khoom siv yuav tsum nyob deb li 3 ko taw sib nrug. Kav hlau txais xov yuav tsum tsis txhob taw tes ntsug thiab kab rov tav, thiab cov khoom siv yuav tsum tsis txhob ze tshaj 3 feet.

Tus kav hlau txais xov hom twg siv hauv xov tooj cua FM?

Bidirectional Dipole - Qhov no yog kab tias feem ntaufeem ntau siv hauv tsev FM kav hlau txais xov. Ib qho, 1/2 nthwv dej, dipole tsim muaj nyob rau hauv kev lag luam nce siv (O dB) rau feem ntau FM tshaj tawm xov tooj cua kav hlau txais xov. Daim ntawv crudest ntawm dipole yog "ribbon dipole" pom tau ntim nrog feem ntau FM tuners thiab receivers.

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