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.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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