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## [TowerTalk] Gin Pole Rope Length

 To: [TowerTalk] Gin Pole Rope Length k4oj@ij.net (Jim White, K4OJ) Tue, 23 Jun 1998 00:58:43 -0400
 ```Double you two double cross states: "Make sure you buy a continuous length, long enough to go up and down your entire tower, plus 5-10% for working on the ground." I STRONGLY [that's emphasis added] disagree.......... If you are using the rope for such activities as the tramming of yagi antennas, the length must be long enough to go vertically up to the high spot [top of tower mast] and must also be long enough to come down to the ground AT AN ANGLE......and if you want to take the pull/down rope out away from the tower through a pulley there is a horizontal length to add, too. Geometry again, boys and girls... So....if you have a 100 foot tall mast, and you are tramming from a point which is significantly farther out than your guy points are to aid in avoiding the dreaded top set (I say significantly because there is always a "sag" in the tramming line's path) .....then lets say then for example that you launch your yagi from 100 foot out, your rope needs to be: on the angle: prox 141 ft [square root of two is abouts 1.414] + (100 ft vertical) + (horizontal pull rope - say 20 feet) So, your rope should be at least 2.61 times the height of your tower! Hence: "Buy your main rope three times as long as your tallest tower's mast is high and be comfortable with it" (AKA OJ's Theorem) [I like K5RC's garbage can idea for storing of rope.....hopefully my neighbor will not get wise to my scheme to abscond with his "wheeled" Rubbermaid product] 73, Jim, K4OJ Florida Contest Group - visit our website at: http://www.4w.com/deemer/fcg.htm The Florida Contest Group sponsors the Florida QSO Party, check out the FQP website@: http://home1.gte.net/wd4ahz/fcg/ssqp.htm -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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