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# HEARING THRESHOLDS

### as reported in the paper
MICROWAVE HEARING IN MAMMALS AT 3.0 GHZ
C.A. Cain and W.J. Rissman
University of Illinois
Department of Electrical Engineering
Urbana, Illinois 61801
Page 86

Eleanor White's Comments: The value of this table is to closely define power levels (watts per square cm) at pulse peaks which were successful or close to successful with a microwave carrier frequency of 3 GHz.

This information is displayed here in the event that any victim or supporter is able to find funding, facilities, and willingness to try to construct and demonstrate an Allan Frey type voice-to-skull transmitter. This table seems to lack the duty cycle (ratio of pulse-ON to pulse-OFF time) however with a test setup, that can easily be found by trial and error.

Signals like those shown in the table below were for experiments using a steady train of uniform pulses. To convey voice, some sort of variation in pulse width or rate needs to be tried, which again, like duty cycle, can rapidly be found by experimentation if facilities are available.

    Table 2.  Microwave Hearing Threshold Values for Human Beings

    Pulse   Threshold              Subject Number
    Width   Parameter     #1      #2      #3      #4      #5
    -----   ---------   ------  ------  ------  ------  -------

            Peak Pwr     300     300     300     600     1000
            mW/sq cm

    15 microsec

            Energy       4.5     4.5     4.5     9.0     15.0
            micJ/cm2

    ------

            Peak Pwr    1800     225     600    2000     2000
            mW/sq cm

    10 microsec

            Energy      18.0     2.3     6.0    20.0     20.0
            micJ/cm2

    ------

            Peak Pwr    2500     ---     ---    ---      ---
            mW/sq cm

    5 microsec

            Energy      12.5     ---     ---    ---      ---
            micJ/cm2

    ------

            Average     11.7     3.4     5.3   14.5      17.5
            Energy
            micJ/cm2

    ----------------------------------------------------------

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