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>Force 12 has had their problems with their larger antenna designs... > >Seems like almost all of the problems I've heard have related to large >element mountings to the boom. I think perhaps I'll add a bolt or two to >the larger element brackets on mine before I put them up. (I'm putting up >C49xr's and probably 340N's). > >It's also possible they've changed the mounting hardware/method on later >production runs. > >Perhaps Natan or Tom will comment... I hope they will, but in the meantime ... I recall that this came up a couple of years ago, and it finally became clear that the problem with the big boom rivets occurred with the beefed-up models (H or D?), because the rivets that were used on a relatively few antennas were too short and were not set properly when the booms (with their additional layers of material) were assembled. I wish I could be a bit more specific, but the Force12talk archive is temporarily down -- I can see the messages indexed, but can't bring them up. I had a reflector come off my top C-3, but that was cockpit error on my part -- I used big metal tapping screws to reattach the element bracket after I had removed it during an abortive conversion to a C-4XL, and the screws weren't quite big enough to hold well. When we reinstalled the reflector (which landed in a treetop from 97 feet -- talk about luck!) we used two plated Class 5 bolts through existing holes in the bracket, with Nylock nuts, and I KNOW it's not coming off again. 73, Pete N4ZR Contesting is! The World Contest Station Database is waiting for your input at http://www.qsl.net/n4zr -------------------------------------------- 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 |