Microwave hearing is a phenomenon,decribed by human observers as the
sensations of buzzing,ticking,hissing,or knocking sounds that orginate
within or immediately behind the head.   There is no sound propagating
through the air like normal sound This technology in its crudest form
could be used to distract individuals,refined it could be used to
communicate with hostages or hostages takers directly BY MORSE CODE or
other message systems, possibly even by voice communication.

A 1998 US Dept of the Army unclassified document. It became
unclassified in 2006.
Document is an ADDENDUM to the Nonlethal Technologies-Worldwide study
(NGIC-1147-101-98)

http://www.slavery.org.uk/Bioeffects_of_Selected_Non-Lethal_Weapons.pdf

THERMOELASTIC EXPANSION STUDY OF OUR COCHLEAR MECHANISM OF HEARING AND
MICROWAVE HEARING OF RF PULSED FIELDS
technology goes back over 30 years


Mechanism to Produce the Desired Effects

After the phenomenon was discovered,several mechanisms were suggested
to explain the hearing of pulsed RF fields. Thermoelastic expansion
with the brain in response to RF
pulses was first studied and demonstrated in inert materials and was
proposed as the mechanism of hearing of pulsed RF fields.
A PRESSURE WAVE IS GENERATED IN MOST SOLID AND LIQUID MATERIALS BY A
PULSE OF RF ENERGY
a pressure wave that is several orders of magnitude larger in
amplitude from that resulting from radiation pressure or from
electrostrictive forces.  The characteristics of the field-induced
cochlear MICROPHONIC IN guinea pigs and cats, the relationship of
pulse duration and threshold, physical measurements in water and in
tissue simulating materials,as well as numerous theoretical
calculations
ALL POINT TO THERMOELASTIC EXPANSION AS THE MECHANISM OF THE HEARING
PHENOMENON.

Scientists have determined the threshold energy level for human
observers exposed to
pulsed 2450 MHz fields  (0.5 to 32 micron pulse widths). They found
regardless of the peak of the power density and the pulse-width, the
per pulse threshold for a normal subject is near
20 mJ/kg. The average elevation of the brain temperature associated
with a just perceptible was estimated to be about
 5xl0 -60 C,  (0 drops lower than the 6).

Time to Onset

The physical nature of this thermoelastic expansion DICTATES AS THE
SOUNDS ARE HEARD AS THE INDIVIDUAL PULSES ARE ABSORBED.

THUS THE EFFECT IS IMMEDIATE (WITHIN MILLISECONDS)

Tunability

The phenomenon is tunable in that the characteristic sounds and
intensities of those sounds depend on the characteristics of the RF
energy as delivered.  Because the frequency of the sound is dependent
on the pulse characteristics of the RF energy, IT SEEMS POSSIBLE THAT
THIS TECHNOLOGY COULD BE DEVELOPED to the point where words could be
transmitted to be HEARD LIKE THE SPOKEN WORD EXCEPT THAT IT COULD ONLY
BE HEARD WITHIN A PERSON'S HEAD.

  In one experiment, communication of the words from one to ten using
"SPEECH MODULATED" MICROWAVE ENERGY WAS SUCCESSFULLY DEMONSTRATED.

  MICROPHONES NEXT TO THE PERSON EXPERIENCING THE VOICE COULD NOT PICK
UP THE SOUND.  ADDITIONAL DEVELOPMENT OF THIS WOULD OPEN UP A WIDE
RANGE OF POSSIBILITIES.

HUMANS HAVE BEEN SUBJECTED TO THIS PHENOMENON FOR MANY YEARS

Technology Status of Generator/Aiming Device

 This technology requires no EXTRAPOLATION to estimate its
usefulness.  Microwave energy can be applied at a distance, and the
appropriate technology can be adapted from existing RADAR UNITS.










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