HARBOR CRAFT SHIP-TO-SHORE TELEPHONE SERVICE 709 



sideration. As to transmission, the distances involved in the harbor 

 area are such as to make it advantageous, from the standpoint of 

 quaHty and freedom from fading, to make use of a frequency which 

 will permit covering the entire area with the direct or "ground" wave. 

 The signal strengths obtained with ground wave transmission, however. 



INTEPNATIONAL 



BOUNDARY 



,»BELLINGHAM 



Fig. 1 — Field strengths are indicated in decibels above one microvolt per meter. 



are affected considerably by the terrain, and the location of the station 

 as much as a mile inland might reduce the over-water range as much as 

 50 miles. The selection of a receiving site involved a consideration of 

 interference from a variety of sources including high voltage power 

 lines, automobiles and motor boats as well as atmospheric disturbances. 



