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Appreciate all of Guy's K2AV sage comments, as they are correct. The Force 12 140N element design is a product of more than 8 years elapsed time, 4 years of specific design time and 18 months of build it and validate time. I put up the first two 340N's myself and they are still running just as new. All Force 12 antennas are done following regimented methodology, time-consuming building and testing, outside consulting and various test sites - that is why it takes so long. I am impressed that Mr. Rauch has acquired an overhead of the C-39XRN, as it has not been announced formally in our Brochure as a product and those delivered were to people who were more of an insider than a customer. It, too, was a long development project. The characteristics of the 140N element are well known to me, as I designed it and have tested it in many environments and combinations. Placing the 40N driver between the 20-15-10 reflector zone and drivers modeled pretty well, as this element is close to transparent. Nothing is truly transparent in the very near field, as it is a hunk of metal, so there were adjustments made to compensate. The result is the ability to have a wider boom for the 40 mtr spacing, while only extending the overall boom 3', which compares to very close spacing on the C-36XR with both 40 mtr elements out the back of the antenna. The C-51XRN shares basically the same 240N spacing as on the '39, except we were able to not extend the boom - nice, because it is big enough already! Someone want to know how we do it? Hard work and being honest during the process. We have concurrent development projects going on all the time (most prompted by customer requests) and release products only when they have been thoroughly tested. If they do not meet our standards, they remain in the "files." One final comment - someone said something to the effect that an open sleeve element combination acts like a trapped element - not hardly. If anyone has more design and tower time than I do with open sleeves, let them stand up and be counted. I also have the patent on the 3-band open sleeve, have built more than 70 different designs using open sleeve driver cells and sleeved parasitic elements. The largest is the C-49XR, which took close to 2 years after we had been shipping the C-31XR - and you thought it was easy - just add another forward cell?!! They are nothing like a trapped element. Always accepting suggestions for products and improvements. The SIGMA verticals are one more example. They are a new era in verticals - again - took several years to do it. 73, Tom, N6BT Force 12, Inc. -------------------------------------------- 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 n4zr@qth.com |
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