On Fri, 18 Mar 2005 03:41:27 GMT, Ed
wrote:



I have a vertical slide window in my ham shack. In order to feed my coax
fed antenna systems through it, I have made a 3/4" thick piece of partical
board, about 6" tall amd ,mounted a couple BNC feedthru adapters in it.
This works quite well for coax. The window frame itself is plastic.

I would like to use a balanced tuner in my shack, about 2 feet from the
window, and feed ladderline to my antenna.

Question: What is recommended to feed the ladderline through the
particle board? Could I just drill and mount a couple #6 brass bolts with
solder eyes on each side of the board and use it to connect ladder line, or
is something else recommended? Will this have any measurable effect on
efficiency?

Thanks.


Ed K7AAT

I use a couple of big ceramic feedthrough insulators from Surplus
Sales of Nebraska. They're mounted on a board in the bottom of my
window. The slight impedance bump from the feedthrough bolts seems to
have no effect on the ladderline. The settings on the tuner were the
same before and after installing the feedthroughs.

In another recent thread some recommended using two pieces of coax to
feed ladderline through a wall or whatever.

Another idea would be two double-female so-239 feedthrough's, plugging
the ladderline into each center hole with banana plugs (banana plugs
fit the center hole in an so-239 just fine).

Bob
k5qwg



Bob
k5qwg