Abstract
The long range propagation of a CW 14-Hz signal was studied experimentally. A shallow source was towed across the North American Basin to a maximum range of about 2700 km. The signal was received on a sound channel hydrophone and the envelope recorded. Well-defined convergence zones were observed over the major extent of the tow. The existence of this mode interference wavelength as a sharp spectral line is shown in a power spectrum calculation of the envelope squared versus range.
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