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Ladder Line Entry to Shack
Hi Guys,
This is an age old question - what is the best way to get 450 Ohm ladder line into my shack antenna tuning unit (ATU)? Here is my situation; I have two 4" PVC tubes inserted into the exterior wall that allow the entrance of coaxial cable into my shack. When I run the ladder line into the shack through one of these ports, the multi-band wire antenna fed with the ladder line goes wild! I can not get the antenna to tune with any of my ATUs. I have received several suggestions on how I can overcome this problem. The most promising one seems to be to use two short pieces of coax with center conductor connected to either side of the ladder line. These pieces of coax, in turn, would be fed through the PVC hole into the shack and the center conductors connected to the ATU. The shield on the coax would float with no connection to any thing. This solution sounds good; however, common sense tells me that ladder feed line will still suffer because of its proximity to other objects. Any thoughts on this solution? Another possibility is using a piece of Plexiglas place under a metal framed window pretty much as shown in the old hand books. My problem with this solution is that the window is on the other side of the room from operating table, the two coax entry ports and AC power. Short of placing the tuner outside in the elements, is there a solution to my problem? I would be interested in hear what has been tried! Tom, K8JRM in OKC |
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