Extremely low frequency - Wikipedia, the free encyclopedia
One of the difficulties posed when broadcasting in the ELF frequency range is antenna size. This is because the antenna must be at least a substantial fraction of .
http://en.wikipedia.org/wiki/Extremely_low_frequency
Communication with submarines - Wikipedia, the free encyclopedia
A station in Antarctica at 78°S 167°W noticed when the Soviet Navy put their ZEVS antenna into operation. Due to the technical difficulty of building an ELF .
http://en.wikipedia.org/wiki/Communication_with_submarines
US NAVY ELF Antenna tests
US NAVY ELF ANTENNA ATTEMPTS WITH SUBMARINE COMMUNICATION. Due to the penetration ability of ELF radiation, the US Navy incorporates it for .
http://jnaudin.free.fr/systemg/html/elfnavy.htm
ZEVS, The russian 82 Hz ELF transmitter
To build and operate an ELF-transmitter is neither an easy nor cheap economically and technically task. The antenna system needs a lot of space and the .
http://www.vlf.it/zevs/zevs.htm