Observations of troposcatter and anomalous propagation signal levels at 11.6 GHz on 155 km path over the sea

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Abstract
Microwave CW transmissions from the French coast near Le Havre are being monitored at Portsmouth along a 155 km path. Preliminary observations indicate that the troposcatter levels of about −117 dBm agree with conventional calculations. However ducting has been seen to persist for long periods, with signal levels exceeding the free space value of −48 dBm by several decibels. On other occasions enhancements of several tens of decibels have been associated with warm and cold fronts and with heavy rain.