On Thu, 18 Sep 2008 12:38:49 -0400, "Walter Banks" said: > I didn't lay out the boards. The antenna was a multiturn > rectangular coil about 1.25 inches by 2.5 inches with a cap > across it. When I got involved they had a transmit layer > running on three different processors and had some reliability > numbers for that layer as a proof of concept. Maybe something like the inductors they use in speaker crossovers - enameled wire on a square ferrite rod. It would be nice to be able to do wireless home automation without much electronic complexity. I like the idea of low frequency RF, it's so forgiving. Cheerful regards, Bob -- http://www.fastmail.fm - IMAP accessible web-mail -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist