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This reflector is working better than I ever hoped! The C31XR uses a combination open and closed feed system developed specifically for the XR series of antennas. The closed sleeve part of the feed includes the two wires that are connected at one end to the 10 meter driver and at the other to the 20 meter driver. The spacing between these two wires if not correct can cause 15 meter resonance well below the band and subsequent higher and out of spec VSWR on 15 meters. A spacing of anything greater than 1/4" will usually cause this high VSWR problem. This issue seems to be exacerbated by installations of lower than 1 wavelength. Easily, 95% of the field inquiries I receive asking about high VSWR can be addressed by movement of these two wires. Unlike and contrary to what is shown in photographs and text in earlier manuals, these wires need to be quite close together. A good solution is to put a width of vinyl tape every 12" or so along the length of these wires. This action will normally bring the resonance up to a point within the band and will result in a low VSWR throughout the band. Most other 15 meter anomalies have to do with 40 meter beams in the neighborhood. A few have even been traced to incorrect element lengths! I am getting the manuals changed and eliminating the photographs in the manuals so that we do not continue having this problem. Natan W6XR/2 FORCE 12 East Ithaca, NY -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact force12@qth.com |
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