[Elecraft] OT: Leaky coax

[Ken G Kopp]

Lots of "leaky" coax in use, both passive and active.  Used in mines,
buildings, both large and tall, paging systems in hospitals, etc.

Here in the mountains of Montana most RR tunnels have it for carrying
control signals between front and rear multiple-engine units.  There are
antennas connect to the coax at both ends.

Trivia: It's not unusual for a grain train to be much longer that the
tunnel through the Continental Divide.

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