OK. The late genius Tim Mrock told me about this method. He pobably told others, I have no idea. But it works. However he did not invent it, the idea came from another source.
It involves cutting a thin, 2-wire power cord (like a thin lamp cord). It should be about 6-8 feet long depending on your system. Leave the plug on the end. Make sure to seal the cut end safely so that the wires can’t short and are not exposed.
Get a wooden dowel rod, about one half inch diameter and 16 inches long. Starting at the cut end of the lamp cord, coil the cord around the dowel tightly, leaving 5 inches of dowel as a handle. The more close tight winds, the better. Tape the coil with electrical tape so that it can’t unwind from the dowel. The result should look like a wand with a wound coil and a wooden handle, with a 4 foot trailing power cable and AC plug. Stick the coil under your PPT Mat, plug it into the AC, and in Tim’s own words "KABOOOM!!!"
The wand needs to be on all the time for best effect, but it does have lasting effect for a time after it’s turned off. . You can create a wand for every mat you own. Too many wands does create a horrible tangle of power cords.
Disclaimer : Get a qualified electrician to make the wand(s). Don’t make them yourself like I did.