Adjacent Channel Proximity Creates Interference

Tuesday, February 28, 2017

A company that provides emergency monitoring services began experiencing “dark periods” during which it lost contact with the many units it monitors. EWA was requested to investigate possible sources of interference, and identified a large energy company, located four miles away, operating a properly licensed trunked system on an adjacent channel at 250 watts effective radiated power (ERP).  The two companies had coexisted for years with no interference issues before this time.  However, the energy company had recently changed to digital equipment. The two companies worked together on a solution which resulted in the energy company modifying its license and operations to go back to analog equipment on the one channel that was causing the interference. Since the change and both operating analog, the monitoring company has experienced no loss of data.

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