Fw: [Antennas] windowed ladder line vs. true open wire line

Fri, 7 Feb 2003 08:39:50 EST

There is a very simple test for the efficiency of your feedline, it is 
outlined in the Autek RF1 manual. You simply measure the minimum impedence 
of a length of line, apply the formula, at that is the loss at that 
frequency. It would be very interesting to compare loss figures between your 
modified ladder line versus the original using this method.
I have been very unimpressed with the commercial 450 ohm stuff that I've 
tried, it has not been significantly less lossy than than the 300 ohm ladder 
line. Because of the smaller size, I've stuck with the 300 ohn stuff, or 
used home-made ladder line.
Paul, K5AF
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