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screws. The holes on Force 12 products are designed for rivets, such that the hole for joining element sections are the same size. If you used a self tapping screw without modifying the element holes, you will have a heck of a time taking the yagi apart as you will deform the hole - i.e. some aluminum from one tube will get pulled into and bind with the other hole. To (more) safely use screws, you would need to widen the hole of the outside tube (thus negating using a rivet on that hole forever). That said, anyone who goes on a number of dxpeditions, or has a habit of installing and taking down the same yagi, knows that very quickly that holes with self tapping screws tend to get larger and mucked up. Disassembly at some point will be impossible regardless how careful you are. With rivets, the holes remain the same size, and allows for multiple installations without any change. Every type of element connection such as rivets, screws, bolts and hose clamps etc have pro's and con's. On Dxpedtions, you have different issues than for home installation. The key for DXpedition antennas is quick assembly and disassembly, REPEATED assembly and disassembly, and the need for common parts when you loose some (you will!). I have used all of the above types of connections on DXpeditions, and prefer the rivets, even with the extra stuff you need to bring. Rivets go in really quickly, and come out quickly too. Screws are probably just as quick, but as mentioned, will much up the elements really quickly. Bolts take too long, and you need different sizes for different sections of the antenna (only one size of rivet needed). Bolts will also deform the element if you overtighten it (which is common) making it hard to disassemble. Hose clamps are not good mechanically (the break and rust quickly, even stainless clamps). Both the clamp itself is prone to failure, and on verticals, the downward pressure from the guy ropes on a medium size vertical will compress the element (slippage) and detune it. Kenny K2KW ----- Original Message ----- From: "Joe Mitchell" <Mitchell@wireless-engineers.com> To: <Force12Talk@qth.com> Sent: Saturday, September 28, 2002 11:04 AM Subject: RE: [Force 12 Talk] C3s dissasemble > Why use rivets at all for a temporary setup? > Perish the thought but wouldn't self-tapping screws be better? > 73 > Joe > K4AW > > > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force12 Web Site: http://www.force12inc.com > > To Submit Message to the List: Force12Talk@qth.com > To unsubscribe and view the Message Archive: see http://qth.com/force12/list > For problems with the list: contact n4zr@qth.com > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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