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#6
February 14th 10, 08:14 PM
posted to rec.radio.amateur.antenna
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Why 50 ohms?
On Sun, 14 Feb 2010 01:33:58 -0800 (PST), phaedrus
wrote: why are transmitters normalised to 50 ohms when clearly 450 ohms would enable us to enjoy cheaper, do-it- yourself, lower loss feeders? A 450 ohm coaxial cable would be rather large. Zo = 450 = 138 log(b/a) (where b=OD and a=ID) For an inner conductor diameter of 1 mm, the outer shield diameter would need to be 1800 mm or about 71 inches. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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