Under, over and out

日期:2019-03-06 11:15:23 作者:梅窍拐 阅读:

By Catherine Zandonella in San Francisco SUBMARINERS in the US Navy will soon be able to surf the Web from deep under the ocean. Their secret? A clever floating antenna that can transmit and receive radio signals, even when waves wash over it. Submarines already use floating cables for radio communication but they work at very low frequencies, sending voice and data signals at rates far slower than a domestic dial-up modem. To transmit lots of information, subs have to surface to contact satellites, ships,