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Since Dec. 30th, I have been hearing an unusual pulsing signal on 14.320MHZ. It has 50 regularly spaced, long, dash-like pulses per minute. These pulses have rather rough-sounding audio modulation, in two different tones. The signal alternates the two tones, 37 pulses in one tone, then 37 in the other.  It's heard intermittently, usually between 16:00 and 23:30 Universal time. I've heard it on the West coast of the U.S. Another ham reports hearing it on the East coast. Signal is as strong as S. 7 and S. 9, at times. Has anyone else heard this signal, and/or have any ideas on it's source or identity?