Digital tropospheric scatter

An old communications tool is put to new use by combining it with new concepts in propagation. Using simple, proven binary detection methods ¿ such as frequency shift keying ¿ substantial range improvement is shown over multichannel FM (frequency-modulated) or SSB (single-side-band) tropospheric scatter schemes, at the sacrifice of analog capability. Alternatively, over shorter distances, substantial reduction in equipment complexity can be achieved over other modes. Measurements made on a feasibility circuit of 150 miles using very simple equipment has shown the practicality of this concept.