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Unidentified Anomalous Signal
November 25, 2001
ELFRAD equipment detected a strong unknown signal on Sunday afternoon at 1:51 PM EST (18:51 UTC). This signal was transmitted with a frequency bandwidth from 1.92 to 2.01 hertz. The duration of this signal was 58 minutes and 55 seconds. The signal was a pulse type of transmission using a pulse width of .1 second repeating every .5 seconds. These pulses were high level with an relative amplitude of 600 millivolts peak to peak. The background noise level was 20 millivolts peak to peak.
The first graph below indicates transmission duration.
The next graph is a two minute segment with analog low pass filtering with a cut off of 25 hertz
Graph #3 shows the timing of the pulses which repeat every .5 seconds
Graph #4 indicates the pulse width which is .1 second
Please contact ELFRAD if you have detected anything similar to this signal.
