>The cause of people hearing radio transmissions in their heads has been >traced to old school tooth fillings
I'm very familiar with detection of AM signals in tooth fillings and the like, but that did not seem to be the mechanism at work in this case. I scanned the copy of the patent 3,393,279 I've had in my files all these years so you can see what it is about: http://www.wd8das.net/neurophoneRF.pdf I noticed that the name on the patent and the material at http://www.neurophone.com are the same, so they are certainly related. I was mistaken in my earlier thought that they were different. My confusion came from the way he is now marketing the system as "ultrasonic", rather than an RF technology. At those frequencies (20kHz-200kHz) it just depends on the medium involved (AC current thru the body versus vibrations in the body versus electromagnetic field passing thru the body) as to how you describe it. Maybe it was easier to avoid some regulations if it wasn't considered RF. The digital modulation technique described on the website might be related to his other patent, 3,647,970. Steve WD8DAS sbjohns...@aol.com -------------------------------------------------------------------- Capital City Hamfest - Sat, Jan 23 - Madison, Wisconsin http://www.wd8das.net/hamfest -------------------------------------------------------------------- ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
