Lub kav hlau txais xov foil muaj qhov nqaim bandwidth thiab resonates ntawm ib zaus. Ntawm lwm cov zaus, lawv tsis zoo sib xws, yog li kev txais tos tsis zoo (thiab qhov kis tau tus mob tuaj yeem ua rau koj lub transmitter puas). Ua ib lub ntsiab lus dav tawm ntawm ib daim ntawv ci nce bandwidth; nws kuj nce qhov aperture, yog li koj tuaj yeem tau txais hluav taws xob ntau dua. Cov teeb liab TV tshwj xeeb yog qhov tshwj xeeb rau cov lus teb bandwidth zoo vim tias lawv yog 6 MHz dav cov teeb liab, thiab yog tias muaj cov theem thiab kev cuam tshuam hauv lub kav hlau txais xov vim muaj kev cuam tshuam txawv txawv, koj lub teeb liab yuav garbled thiab muaj peev xwm saib tsis tau.
Cov khoom siv lub kav hlau txais xov foil yog ua los ntawm tsis muaj teeb meem. Tsuav nws ua hluav taws xob zoo thiab muaj cov khoom siv kho tshuab zoo. Cov kav hlau txais xov sab nraud yog tsim los ntawm cov txhuas tuab vim nws pheej yig, hnav, thiab tiv taus corrosion.
Ib qho zoo tshaj plaws ntawv ci kav hlau txais xov yog ib tug hneev khi, uas koj tuaj yeem ua los ntawm lub tsho hanger hlau los yog txhuas ntawv ci, txhawb nqa nrog cardboard yog tias xav tau, thiab dai rau ntawm phab ntsa. Cov ntsiab lus no yog cov piv txwv ntawm yooj yim fractals. Qhov chaw ua haujlwm yog me dua (ze rau qhov chaw) ntawm cov zaus ntau dua, tab sis qhov kev ua haujlwm hluav taws xob zoo ib yam ntawm cov zaus qis dua. Kuv tau tsim hneev khi kav hlau txais xov mus rau 3 MHz thiab lawv phim lub transmitter zoo.
