I'm looking for an engineer to help me with an experiment I'm conducting as a hobbyist. I need a simple radio device built, that can transmit at a certain frequency with minimal power output. The truncated scientific journal article, containing the specifications and desired outcome is copied below. More information can be supplied as well. Thanks:
Frey, Allan H., Human Auditory system response to modulated electromagnetic energy.
Journal of Applied Physiology. 17(4): 689-692. 1962.
(*) Asterisks indicate unreadable characters in the original copy.
NOTE: In 1962, frequencies were expressed as kiloCYCLES, megaCYCLES, etc., with abbreviations being kc, mc
The intent of this paper is to bring a new phenomena to the attention of physiologists. Using extremely low average power densities of electromagnetic energy, the perception of sounds was induced in normal and deaf humans. The effect was induced several hundred feet from the antenna the instant the transmitter was turned on, and is a function of carrier frequency and modulation. Attempts were made to match the sounds induced by electromagnetic energy and acoustic energy.
The closest match occurred when the acoustic amplifier was driven by the rf transmitter's modulator. Peak power density is a critical factor and, with acoustic noise of approximately 80 db, a peak power density of approximately 275 mw / rf is needed to induce the perception at carrier frequencies 125 mc and 1,310 mc. The average power density can be at rf as low as 400 _u_w/cm2. The evidence for the various positive sites of the electromagnetic energy sensor are discussed and locations peripheral to the cochlea are ruled out.
TABLE 1. Transmitter parameters
Trans- Frequency, Wave- Pulse Width, Pulses Sec. Duty Cy.
mitter mc length, cm _u_sec
A 1,310 22.9 6 244 .0015
B 2,982 10.4 1 400 .0004
C 425 70.6 125 27 .0038
D 425 70.6 250 27 .007
E 425 70.6 500 27 .014
F 425 70.6 1000 27 .028
G 425 70.6 2000 27 .056
H 8,900 3.4 2.5 400 .001