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Author Topic: 450 Ohm Ladder line Supports  (Read 380 times)
KC2PHJ
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Posts: 21




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« on: March 17, 2007, 06:39:24 AM »

What is the best way to support 450 Ohm ladder line on the side of your house? Is there anything available that can brought and where is that?
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N2UM
Member

Posts: 12




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« Reply #1 on: March 17, 2007, 07:38:56 AM »

I use plastic stick-on hooks made by 3M.  They seem to hold well (they made it through the winter without falling off) on our siding.  I twisted the ladder line between the hooks to minimize any inbalance that might occur because of the close proximity to the house.  The twisting might not make any difference but it made me feel better.
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W5DXP
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Posts: 3583


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« Reply #2 on: March 17, 2007, 07:45:10 AM »

Take a look at electric fence standoffs at stores like Lowe's. They work well for me.
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73, Cecil, w5dxp.com
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
SSB
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Posts: 1




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« Reply #3 on: March 17, 2007, 09:07:12 AM »

Suppliers that sold open wire line used to sell the standoff supports.


Alex....
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K0ZN
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Posts: 1548




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« Reply #4 on: March 17, 2007, 11:28:33 AM »


You can make them very easily out of white PVC pipe.

There are a couple of ways, but one way is to cut 1.5" O.D. PVC pipe into about 2" pieces, then cut ONE split axialy into the pipe piece making kind of a C clamp.
Drill a hole in the opposite side from the cut/split for a screw and you have a line holder. You can also screw the "C clamp" piece into another longer piece of pipe if you want to stand the line off farther from something.

Personally, I just use a couple of loops of plastic tie wraps and suspend the line from rafters, etc.

Keep in mind, that if you are feeding a Non Resonant antenna like a Center Fed Zepp (also called a Doublet) or a loop on multiple bands, etc, you WILL have pretty high voltages (even with 100 W) on the ladderline at different points, depending upon the band. You don't want people or pets to be able to accidently come in contact with it while you are transmitting. At a KW of input in this situation, you WILL have dangerous voltages on the line. There is a serious RF burn hazard if somebody touched the like when you were transmitting. I love ladderline for the low losses, but you have to be aware of the voltage hazard (which does not exist with coax).

This is what Ham Radio is all about....building some of your own equipment and station accessories. Even small projects like this can add a lot of pride and satisfaction to you hobby.

73,  K0ZN
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