$GTCH “Using NVIS propagation may enable the tra

$GTCH “Using NVIS propagation may enable the transmission of most power at a high angle, near to the vertical, which can provide efficient coverage for the dead zones of a long-range HF communication system. This type of technology requires the use of unique antennas that are designed specifically for this type of communication. Typical HF radio antennas provide a much lower angle of radiation and therefore a specifically designed antenna will be used. These antennas provide a high angle of transmission that is necessary for NVIS propagation. We will use horizontally polarized, horizontal dipoles and loop antennas for the system’s testing. The main challenge of an HF communication system is to provide coverage for the dead zones. NVIS utilizes the difference in elevation pattern responses approaching or reaching 90 degrees. Using this type of antenna technology with an appropriate frequency selection will potentially establish reliable communication to cover HF dead zones. Utilizing AI algorithms, we aim to implement smart, self-tuning antenna along with frequency selection to achieve automatic, optimal performance and complete coverage. In areas where no modern communication infrastructure exists, NVIS radio wave propagation may provide a contact to the outside world enabling remote location emergency response, telemedicine and modern world communication, including the internet,” said Danny Rittman, GBT’s CTO.

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