Basic Structure – Frequency Plan – General characteristics of microwave L.O.S communications transceivers – Antennas and Feeders - L.O.S EM wave propagation. Path clearance – Fading. Analogue and digital links : Signals – Modulation and Multiplexing – Noise – Distortion – Interference – Power and selective fading effects. Diversity Techniques - Quality and availabity objectives. Link budget – Link Operation and Management - Link Design and Engineering – Relevant ITU recommendations.