getting around the fact that radio frequencies can’t travel far through water. Alternative communication systems that use sound, such as sonar, can transmit across long distances underwater ...

The LoRa radio communication system is useful for low-bandwidth communication, and as many readers will be aware its special skill lies in delivering long range. For most of us that range tops out ...

IT is now well-known that all long-distance radio communication takes place by means of electric waves reflected from one of the ionised regions of the atmosphere, the time of travel of the waves ...