Actual parallel line experience: One Field Day we arrived at our usual
site to put up a 300 foot around horizontal loop. We usually corner fed
the Delta shaped loop at a corner with 450 ohm line we keep in Field Day
stocks. About 50 feet at most was our usual feed, but we had a big
wooden spool of various parallel ladder line lengths 450 and 300 ohms.
There had been and continued to be off and on, huge rains. We could not
set up the tent on the ground that was flooded. The closest paved area
was over 200 feet away. We tied off ladder line to trees and spliced
more in with wire nuts, and even added in a stock of 300 ohm ladder
line, until we reached the new location of the tent. The Dentron Super
Tuner as always with that loop; was hooked up with a 4:1 balun external
to the Tuner. Static discharge resistors of 150 k ohms went to a ground
rod from each conductor right at the balun balanced side.
We found that the Tuner had no trouble matching the mixed up combination
of differing impedance ladder lines, nor did we detect any signal losses
compared to the usual shorter ladder line feed.
-Stuart
K5KVH
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