Human Auditory Perception of Pulsed Radiofrequency Energy


The paper is a review of the research conducted over many years. The conclusions are based on the experimental weight-of-evidence of the many papers cited. My personal comments are in [square brackets].

The following are the key points:

  1. Human auditory perception of pulses of radio-frequency (RF) energy is a well-established phenomenon that is not an adverse effect.

  2. It is dependent upon the energy in a single pulse and not on average power density.

  3. RF-induced sounds can be characterized as the perception of subtle sounds because, in general, a quiet environment is required for the sounds to be heard.

  4. The sound is similar to other common sounds such as a click, buzz, hiss, knock or chirp.

  5. Effective radio-frequencies (reported in the literature) range from 216 MHz to 10,000 MHz (10 GHz), but an individual's ability to hear RF-induced sounds is dependent upon high-frequency acoustic hearing in the kHz range.

  6. The fundamental frequency of RF-induced sounds is in-dependent of the radio frequency but dependent upon head dimensions.

Note: The range of microwave hearing is based on PULSED RF energy.

For anyone wondering why we may experience microwave hearing differently from one another, it's all right here:

(1) You need to be able to hear high (acoustic) frequencies in the kHz range.
(2) It is dependent on the size of your head.
(3) It is dependent on the acoustic properties of your brain tissue.

A quiet environment is necessary because the normal noise levels in the environment mask the perception of RF sounds.

Some other points:

(1) In one 1973 study, microwave hearing was BLOCKED when a metal shield of aluminum flyscreen (like in your windows) was placed between the subject and the radar.

(2) You can hear microwaves in a number of different ways. Two reports from Russian scientists described the perception of pulsed RF signals as polytonal sounds and TINNITUS.

(3) LOUDNESS is dependent the energy in the first 30m s of the pulse, regardless of how wide the pulse is. Thus, if sufficient energy is deposited within a 30-m s period, an RF-induced sound will result regardless of pulse width. For pulses greater than 90m s, loudness will increase along with peak power because the energy associated with the first 30m s of the pulse increases directly with peak power.

(4) The paper states that anyone reporting RF hearing would have to be relatively close to a pulsed source operating in the 216-10,000 MHz range. They don't define "relatively close".

[Remember, this is a cell phone company stating these things. What that means is that they know full well that microwave hearing is possible when someone is close to the source - in their case that would mean a cell tower antenna.]

(5) Very high intensity RF pulses will induce adverse effects such as convulsions and a state of unconsciousness (STUN EFFECT). This was demonstrated by the one of the authors of the paper in a previous study from 1982.

(6) Tests in rats revealed neuronal demyelination at one day after exposure and brain swelling at one month after exposure.

[Maybe that's why headaches are commonly reported among victims. Doesn't fibromyalgia/CFS also have to do with demyelination of nerve cells?]