Early "wireless" intercom units actually used carrier current. If you and your neighbor had the same intercom equipment, and were on the same service transformer, things could become interesting, as you had an instant "listening Tom" in each other's houses.
The units I played with transmitted somewhere in the lower 400 KHZ region, but their signal was so weak that I could barely detect it in a traditional receiver. Mike Duke, K5XU American Council of Blind Radio Amateurs ______________________________________________________________ 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 Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
