- Published in issue 11/1994 on page 24
Although wireless communication is nothing special these days, it is not a panacea. Below the ground, tor instance, radio waves will not get you very tar, In such cases, nothing beats copper wire to set up a reliable communication link. The communication system described here is remarkable because it uses only one such wire. Low-cost, and ideal tor a camping site intercom, or a cave explorers' talk line.