Reversed Doppler

Raw WAV files

download 1
706 kb


download 2
6.437 Mb


Noise (caused by moving mic) marks the midpoint when craft overhead.

download 3
1.921 Mb

spectrogram total frequencies

spectrogram lower frequencies

Stereo: Note the dogs yapping after the noise abates.


Normal Doppler

     On 7 November 2007 Bruce Cornet was at Stewart International Airport (also Stewart Air Force Base) when a C-5 transport plane took off and circled around the airport before disappearing.  He recognized the sound as similar to that made by the Manta Ray craft on 10 August 1996 and on 22 January 1997, calling it a weird sound.(  The C-5 makes this type of sound only when taking off - possibly a result of all four engines at maximum throttle.  As the C-5 came towards him, it displayed a normal Doppler sound: Frequencies rose until the plane was overhead, then the frequencies dropped as the C-5 moved away.  He recorded the plane and sound as an MOV file on his camera.  A laterally-time-compressed frequency spectrogram below shows a normal Doppler.  You can download the sound file to hear it and compare it to the reversed Doppler.  Because this sound is only produced when a C-5 accelerates during take-off, for the Manta Ray to be confused with a C-5 taking off would mean that such an enormous aircraft had taken off from a nearby farm field nine miles from the airport - an impossibility.  Therefore, was the Manta Ray trying to mimic a C-5?  Its navigation light also mimicked those of a C-5.  See "Mimicry may be the Objective of ETI Triangular and Diamond-shaped Probes" (

C-5_compressed-label3.jpg (86470 bytes)

download C-5 sound
1.537 Mb
7 November 2007

download C-5 video
31.893 Mb

Frequency Spectrograms

28Apr1993 (voice of Ellen Crystall recorded)

28Apr93a.JPG (433527 bytes)

28Apr93b.JPG (441231 bytes)

Note midpoint where banded frequencies begin to rise in pitch after Flying Triangle passes over camcorder, which is typical of all the UAP recorded. Also note how frequences become more bunched at lowest point, possibly reflecting a vertical compression component underneath the craft.

28Apr93c.JPG (300146 bytes)

10Aug1996 (no voice recordings)

10Aug96a.jpg (63173 bytes)

Sound begins when craft about 1/2 mile away; note how pitch first rises until 5 sec, then levels out and begins descending in frequency, indicating that the reversed Doppler effect only stretches out so far from the craft.

10Aug96b.jpg (95791 bytes)

10Aug96c.jpg (112668 bytes)

midpoint 39-40 seconds

10Aug96d.jpg (89357 bytes)

Frequency bands begin to level out at 55 sec as reversed Doppler offsets normal Doppler.

10Aug96e.jpg (32269 bytes)

22Jan1997 (no voice recording; dogs yapping at end)

Total range (0 - 10 kHz)

22Jan97xx.JPG (120213 bytes)

Note how higher band of frequencies between 6 kHz and 7 kHz rise in pitch according to a delayed normal Doppler effect, because the mid point (36 sec) or transition to lower frequencies occurs well after craft past mic (29 sec), indicating a possible reflection of these higher frequencies off of a phase transition boundary behind the craft.  The higher frequencies may represent harmonics of the lower frequencies, or possibly even turbine sounds generated by the engines.

Magnified lower frequencies (0 - 1300 Hz)

22Jan97w.JPG (156886 bytes)

22Jan97x.JPG (174471 bytes)

22Jan97y.JPG (150251 bytes)

36 sec represents the time or point when the frequency bands stop being compressed together or more tightly bunched, and begin a slow recovery or return to more separation after the craft passed the mic.

22Jan97z.JPG (72469 bytes)

                                                                                                     Dogs yapping.

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