翻訳と辞書 Words near each other ・ Anterior auricular veins ・ Anterior border ・ Anterior branch of obturator nerve ・ Anterior canal ・ Anterior cardiac veins ・ Anterior cardinal vein ・ Anterior cecal artery ・ Anterior cerebral artery ・ Anterior cerebral artery syndrome ・ Anterior cervical discectomy and fusion ・ Anterior cervical lymph nodes ・ Anterior chamber of eyeball ・ Anterior choroidal artery ・ Anterior ciliary arteries ・ Antenna Tre Nordest ・ Antenna tuner ・ Antenna TV ・ Antenna World Tour ・ Antennablennius ・ Antennablennius adenensis ・ Antennablennius australis ・ Antennablennius bifilum ・ Antennablennius ceylonensis ・ Antennablennius hypenetes ・ Antennablennius simonyi ・ Antennablennius variopunctatus ・ Antennacanthopodia ・ Antennae (album) ・ Antennae Galaxies ・ Antennaerenea niveosignata Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Antenna tuner ： ウィキペディア英語版 Antenna tuner An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), or antenna coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna’s feedline. Similar matching networks are used in other equipment (such as linear amplifiers) to transform impedance. An antenna’s impedance is different at different frequencies. An antenna tuner matches a radio with a fixed impedance (typically 50 Ohms for modern transceivers) to the ''combination'' of the feedline and the antenna; useful when the antenna’s feedline impedance is unknown, complex, or otherwise different from the transceiver. Coupling through an ATU allows the use of one antenna on a broad range of frequencies. However, despite its name, an antenna ‘''tuner''’ actually only matches to the antenna feedline – an antenna ‘tuner’ does not and cannot change the resonant frequency of the aerial. Operating an antenna far from its design frequency and compensating with a transmatch is not as efficient as using a resonant antenna with a matched-impedance feedline. If there is still a high SWR (multiple reflections) in the feedline beyond the ATU, any loss in the feedline increases, heating the wire instead of sending out a signal. Additionally, losses in the ATU itself can also waste power. == Broad band matching methods== Transformers, autotransformers, and baluns are sometimes incorporated into the design of narrow band antenna tuners and antenna cabling connections. They will all usually have little effect on the resonant frequency of either the antenna or the narrow band transmitter circuits, but can widen the range of impedances that the antenna tuner can match, and/or convert between balanced and unbalanced cabling where needed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Antenna tuner」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.