Ham op writes:


My installation is as follows: 1) 600 ohm open wire line [tuned of
course!] from the antenna to a protected [from WX] area under the sun
porch. There I simply connected 450 ohm ladder line to the 600 ohm line
for the run into the house. [450 ohm line has increased losses in bad
WX]. As mentioned in another response, I run the 450 ohm line at right
angles over metal structures. I keep the line a least 6 inches from
pipes, heating vents etc and twist the line one twist every three [+/-]
feet.

I run 1 KW 80 through 20 meters with NO interference or RFI in the
shack. This computer is located 3 feet from the amplifier and has no
adverse effects from the amplifier. BTW, my station is grounded
[earthed] IAW electrical code.

Are there any lengths for the xmission line one should avoid when feeding
different types of wire antenna?

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R*Horse rwinner.blogspot.com