Electrosmog is a popular term indicating that an electric device generates disturbing electric or electromagnetic radiation, which is either transmitted into the air, like your cell phone, or fed back into the mains power grid.
Radiated electrical signals may cause humming and noise in other devices, like on a radio. Electric disturbance signals fed back into the electric grid simply turn up at other mains outlets and cause similar noise problems as radiated electrosmog.
PEMF therapy devices, like all electrical devices, may also radiate or send back electrical disturbance signals into the power grid, if they are wrongly designed. It is important to understand the underlaying reasons of these undesired signals and to suppress them at source.
PEMF frequencies not only contain the specific desired generated pulsed frequency, but also cause so called harmonic frequencies. A harmonic of a wave is another frequency wave, which is a multiple of the original generated frequency.
For example, if the generated pulsing frequency is 5 Hz, the first harmonic is 10 Hz, the second harmonic is 15 Hz, the third harmonic is 20 Hz etc. Although these undesired harmonic frequencies decrease in strength very fast for each step, they are still unwanted signals and it is important to suppress them at source.
In addition, PEMF fields outside the set therapy frequency are uncalled for, being another reason why suppression is an absolute must in PEMF devices.
When pulsed wave signals are not sinus waves it becomes impossible to avoid or suppress these unwanted harmonic frequencies, another reason why only pure sine wave signals should be used in PEMF devices.
Because of the very fast wave signal switching, it is very important to switch the PEMF pulses at exactly the moment these sine waves are crossing the zero point.
When you look at the pendulum above imagine the moment the pendulum reaches its highest point at either side, it stands still for a very short moment, just before it returns to the other side, where it again stands still for a very short moment at its highest point.
The path of the pendulum is actually a perfect sine wave!
A PEMF device pulsing with another wave form other than a pure sine wave, causes electrosmog. Even if pure sine waves are the basis of the pulsed signal, it is crucial that the individual PEMF switching is synchronized when the sine wave crosses the zero point, which is the very short moment the pendulum is at complete standstill.
Only perfect synchronization between electronics hardware and software will guarantee electrosmog free PEMF.
Different forms of power line noise exist. E.G. noise caused by by Electro Magnetic Interference or Radio Frequency Interference. This picture shows electrical noise superimposed on a regular power line sine waveform.
These random electrical noise signals travel through the power grid and can easily cause undesirable effects in computers and electrical appliances connected to the same power grid. A filtering system inside the PEMF device prevents electrical disturbance signals from being fed into the power grid block electrosmog signals from the power grid.