Ma ke alo o kahi hōʻailona papahana o ka hoʻolālā RF, ʻo kekahi o nā huaʻōlelo maʻamau ʻo "dB". No kahi ʻenekinia RF, ʻike ʻia ka dB i kekahi manawa e like me kona inoa. ʻO dB kahi ʻāpana logarithmic e hāʻawi i kahi ala kūpono e hōʻike i nā lakio, e like me ka ratio ma waena o kahi hōʻailona hoʻokomo a me kahi hōʻailona puka.
No ka mea he ratio ka dB, he ʻāpana pili ia, ʻaʻole ʻokoʻa. Ua ana pono ia ka volta o ka hoailona, no ka mea, ke olelo mau nei makou i ka like ole, oia hoi ka like ole ma waena o elua mau kiko; ʻO ka mea maʻamau, ʻike mākou i ka hiki o kahi node e pili ana i ka 0 V ground node. ʻO ke ʻano o ka hōʻailona ke ana pono ʻia, ʻoiai ʻo ka ʻāpana (ampere) e pili ana i kahi kikoʻī kikoʻī o ka uku no kahi manawa kikoʻī. ʻO ka ʻokoʻa, ʻo dB kahi ʻāpana e pili ana i ka logarithm o ka ratio ma waena o nā helu ʻelua. No ka laʻana, loaʻa ka amplifier: Inā he 1 W ka mana o ka hōʻailona hoʻokomo a ʻo ka mana o ka hōʻailona hoʻopuka he 5 W, ʻo ka lakio he 5, e hoʻololi ana i ka dB ʻo 6.9897dB.
No laila, hāʻawi ka amplifier i ka loaʻa mana o 7dB, ʻo ia hoʻi, hiki ke hōʻike ʻia ka ratio ma waena o ka ikaika hōʻailona hoʻopuka a me ka ikaika hōʻailona hoʻokomo e like me 7dB.
No ke aha e hoʻohana ai i ka dB?
Hiki nō ke hoʻolālā a hoʻāʻo i nā ʻōnaehana RF me ka ʻole o ka hoʻohana ʻana i ka dB, akā i ka ʻoiaʻiʻo, ʻo ka dB i nā wahi āpau. ʻO kekahi pōmaikaʻi ʻo ia ka mea hiki i ka pālākiō dB ke hōʻike i nā lakio nui loa me ka hoʻohana ʻole ʻana i nā helu nui loa: 1,000,000 ka loaʻa ʻana o ka mana o 60dB wale nō. Eia kekahi, ʻo ka nui o ka loaʻa a i ʻole ka nalowale o ke kaulahao hōʻailona aia ma ka domain dB a maʻalahi ka helu ʻana no ka mea ua hoʻohui wale ʻia nā helu dB pākahi (ʻoiai inā mākou e hoʻohana i nā lakio maʻamau, pono ka hoʻonui ʻana).
ʻO kekahi pōmaikaʻi ʻo ia ka mea a mākou i kamaʻāina ai mai ka ʻike o nā kānana. Hoʻopili nā ʻōnaehana RF i nā alapine a me nā ʻano like ʻole e hana ʻia ai nā alapine, hoʻomalu ʻia, a i hoʻopili ʻia paha e nā ʻāpana a me nā ʻāpana kaapuni parasitic. Maikaʻi ka pālākiō dB i loko o ia ʻano pōʻaiapili no ka mea he intuitive a ʻike ʻike ka pānaʻi pane alapine i ka wā e hoʻohana ai ke axis alapine i ka pālākiō logarithmic a hoʻohana ke axis amplitude i ka pālākiō dB.
No laila, i ka hoʻolālā ʻana i ka kānana, pono e makaʻala loa.
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Ka manawa hoʻouna: Mar-04-2022
