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#1
July 22nd 11, 06:44 PM
posted to rec.radio.amateur.antenna
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Cut length on antenna made from coax cable
On Jul 22, 11:51*am, Jeff Liebermann wrote:
*However, I'm not sure if the driven element cut length is the free space 1/4 wavelenth, as it would be with a metal rod coax antenna, or if I should include the 0.67 velocity factor of the coax dielectric covering the center conductor. Is it 19.2" or 12.9" for the driven element? Use the 0.67 VF on transmission line currents. Use VF = 0.95-0.97 for antenna currents. -- 73, Cecil, w5dxp.com |
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#2
July 23rd 11, 06:53 AM
posted to rec.radio.amateur.antenna
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Cut length on antenna made from coax cable
On Fri, 22 Jul 2011 10:44:01 -0700 (PDT), W5DXP
wrote: On Jul 22, 11:51*am, Jeff Liebermann wrote: *However, I'm not sure if the driven element cut length is the free space 1/4 wavelenth, as it would be with a metal rod coax antenna, or if I should include the 0.67 velocity factor of the coax dielectric covering the center conductor. Is it 19.2" or 12.9" for the driven element? Use the 0.67 VF on transmission line currents. Use VF = 0.95-0.97 for antenna currents. Thanks. That's what I was looking for. -- 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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