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I hate to break it to you, but what you have is a
less-than-quarter-wave vertical with a loading coil to bring the terminal impedance up to 50 ohms. Only the straight parts of the antenna radiate and that thing doesn't have very much. Your Moto guy was right in recommending a quarter-wave whip; it would out-perform this loaded version you have now. To counteract hitting trees and other stuff, you could substitute thin, strong 0.03"dia stainless spring stock for the radiator. It has a lot of "give" and could recover from close encounters. I use that for my 1/4-WL whip that daily bangs into my low-hanging garage door. Jim, K7JEB On Monday, June 24, 2013 5:57:05 AM UTC-7, Kickin' Ass and Takin' Names wrote: The current antenna is a vertical whip with a loading coil wound along the length of the antenna. The dimensions a -- Overall height: 14.25 inches -- 4 inches from the base the antenna is wound into a coil, about 3/8 inch diameter, 5 turns -- the coil is 1.75 inches long -- above the coil is 8.5 inches of antenna -- NMO base I suspect this antenna is an old model 5/8-wave VHF antenna, shortened by winding a coil in the antenna. |
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