[AMRadio] Re: Open wire line


D. Chester k4kyv at charter.net
Mon Nov 19 23:36:22 EST 2007


The spacing isn't critical, and the impedence change between 4" and 6" 
spacing isn't very much.  I use #10 wire with 2" spacing on mine.  I chose 
that spacing because that's the length of the E F Johnson ceramic spacers I 
had on hand at the time.  I wouldn't recommend anything greater than 6" for 
frequencies above 30 mc/s, though, because the spacing begins to become more 
than a negligible fraction of a wavelength, causing the line to mimic two 
closely spaced elements, and radiate.

Don k4kyv 



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