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| Railroad Firecracker antenna exposed 2 of 3 http://www.interceptradio.com/bbs/viewtopic.php?f=17&t=7934 |
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| Author: | mrk [ Wed Jan 07, 2015 3:05 pm ] |
| Post subject: | Railroad Firecracker antenna exposed 2 of 3 |
The antenna is comprised of a SO-239 UHF connector on the center bottom of a circular mounting foot that has four holes to mount to a locomotive or railcar. The foot is 2 13/16" in diameter which is welded to a 1" diameter brass pipe that extends from the mounting foot approximately 11" to a brass disk. This brass disk (looks as if it) is welded to a 3" diameter, 1/8" thick cylinder that is 8" long that surrounds the supporting 1" pipe and makes up the most visible part of the antenna. The center conductor of the coax enters the antenna via an SO-239 in the mounting foot and is brought up through the 1" pipe via a silver wire to a wide nut encapsulated in plastic. The energy is then sent through the 1" pipe via holes to the outside 3" cylinder via silver all thread that is electrically coupled to it via star lock washers held in place by ny-lock nuts. From here the electrical path takes the energy up to the top disk of the antenna where the center supporting pipe will take it all the way to ground via the supporting foot and the ground of the SO-239. The antennas upper ruggedization comes from two semi-circular, 3/4" thick pieces of "C" shaped plastic that provide structure rigidity between the 1" pipe and the inside of the 3" cylinder that is held in place by the two pieces of all-thread. <Concluded in Part 3> |
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