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G5RV antenna
The G5RV antenna is a dipole with a symmetric resonant〔HF Antennas for all locations (L. Moxon, G6XN)〕 feeder line, which serves as impedance matcher for a 50 Ohm coax cable to the transceiver.〔G5RV multi-band antenna (Louis Varney, G5RV) http://www.astrosurf.com/luxorion/qsl-g5rv.htm〕〔The G5RV Multiband Antenna ... Up-to-Date (L. Varney, G5RV in The ARRL Antenna Compendium Vol. 1)〕 Louis Varney (G5RV) invented this antenna in 1946.〔Practical Wire Antennas - Effective HF Designs for the Radio Amateur (J. Heys, G3BDQ)〕 It is very popular in the United States.〔ARRL Antenna Book 21st Edition – Chapter 7〕 The antenna can be erected as horizontal dipole, as sloper or an inverted-v antenna. It can operate on all amateur radio bands within 3.5 through 30 MHz.〔〔Novice Antenna Notbook (D. DeMaw, W1FB)〕 While the widely used 50 Ohm coax cable is often used to directly feed this symmetric antenna,〔Rund um die Antenne (M. Rüegger, HB9ACC) http://www.wreiner.at/2008/05/24/rund-um-die-antenne-von-hb9acc/〕 this is not good practice and should be avoided as it can result in RF interference due to high current flow on the outer surface of the coax braid. A 1:1 current balun should be used between coax and ladder line.〔Maxwell, W. (2010). Reflections III Transmission Lines & Antennas〕 The balun not only prevents RF interference but reduces receive noise and of course increases performance 〔What I learned from building my own G5RV / ZS6BKW Antenna (VK4MDX) http://vk4mdx.wordpress.com/2009/02/15/what-i-learned-from-building-my-own-g5rv-zs6bkw-antenna-part-1/〕
The dipole elements are and the impedance-matching symmetric feedline (ladder-line) can be either 300 ohm () or 450 ohm ().〔Practical Antenna Handbook (4th Edition, J. Carr)〕 As for all antennas in general the height of the G5RV above the ground shall be at least half of the longest wavelength to be used.〔 The ends of the symmetric feedline are directly soldered to a 50-Ohm coax cable to the transceiver.〔 A length of at least 50 Ohm cable is recommended.〔HF Antenna Systems: The Easy Way (J. M. Haerle)〕 An antenna tuner is necessary for this antenna.〔
There are many variants of the G5RV antenna.〔The ZS6BKW Multiband HF Antenna Revisited (M. Vincent, G3UKV) http://www.ab4oj.com/dl/sprat_zs6bkw.pdf〕
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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