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. 73 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
