North Atlantic Ship-Shore Radiotelephone Transmission during 1932-1933

This paper extends the analysis of ship-shore radio transmission data for an additional two-year period beyond that reported on in a pervious paper. Contour diagrams show the variation of signal field with time of day and distance for the winter, summer, spring, and fall seasons and for the approximate frequencies 4, 8, and 13 megacycles. A comparison is made with the data obtained during 1930 and 1931. In general transmission during 1932-1933 tends to be somewhat better on frequencies below about 9 megacycles and somewhat poorer on frequencies above 9 megacycles. At 4 megacycles the increase is of the order of 10 decibels, and for 13 and 17 megacycles, the decreases are about 6 and 10 decibels, respectively.