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1) There is no folding near the center of the N element. Folding starts six feet from the boom and goes OUT, not IN. 2) The 7-2 design put the lossiest part of the element (the linear loading) in the highest current place on the antenna (center feedpoint outward and back). The high current center 12 feet of an N element uses the largest diameter portion (least lossy portion) of the element. 3) N element is based on an 85% of full size rule. The 7-2 elements were quite shorter. 4) N folded elements are 1/4 solid rod. The 7-2 LL was number 10 or 8 aluminum wire if I recall correctly. 5) The N folded loading is spaced something over 6 inches apart. The 7-2 had one inch spacing. 6) The 7-2 had these plastic spacers riveted to the boom that kept breaking off with ice and had to be replaced. Nothing like these on the N elements. 7) The 7-2 out-of-band resonances were anyone's guess. The N element particulars have been chosen to enable stacking close to tribanders. 8) The 7-2 was old technology, and done without use of any of the modern design aids. The N elements are computer designed and field validated. The N elements are what I would term a "third generation" linear loading element design, the 7-2's LL being first generation. On Tue, 13 Jun 2000 23:10:23 +0200, you wrote: >In stacking with a tribander/WARC beam, with which ham bands do I except >the "N" elements of the new 40 meter yagis to interact with? Remember >seeing somewhere 18 Mhz mentioned. Is that all? Anyone having experince >with e g EF-240N and C3? Sorry if this shave been covered earlier. >What differs the EF-240N from the old Hy-Gain 7-2? Looks "very similar". > >Thanks for good reflector! >73 de Kari/SM0HRP > > > >-------------------------------------------- >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 > > 73, Guy k2av@contesting.com Apex, NC, USA -------------------------------------------- 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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