July 1970 | NTIA Technical Memo ERL TM ITS 241

Ketchikan 2182 kHz communication

Jean E. Adams

Abstract: The present 2182 kHz communication between Ketchikan, Alaska, and ships or boats within 300 nautical miles of Ketchikan Coast Guard Station is poor. Calculations have been made of predicted sky-wave mode performance for representative circuits with sunspot numbers of 10 and 110, for winter and summer months. Cursory calculations of the ground wave and the diffracted path modes have also been performed. A horizontal half-wave dipole antenna is recommended for installation at Ketchikan Coast Guard Station to increase circuit reliabilities for the sky-wave propagation mode.

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