On Fri, 8 Feb 2002, Walter Banks wrote:

> The lowest cost RF system I have seen is a project I worked on
> quite a few years ago for store electronic price tags. The
> system could send and receive information from individual
> price tags in the store (Typical grocery store 7000)
> The data rate was slow and so was the RF. The processor clock ran
> at 200 kHz the transmitter was the processor clock gated through
> a pair of CMOS xor's controlled from the processor to
> have complimentary outputs into a three or four turn coil of wire
> as an antenna when it was transmitting.
>
> The data rate was about 10 bits per second Manchester encoded. The
> amazing thing was how well it worked, lots of electrical noise
> around. The manufactured cost of the tag (processor 1 or 2 cmos
> parts, case and lcd display was about $4.00 in the volume they
> used.

  That sounds like exactly what I am looking for... how did the reciever
work?  Can you give any more information?

Daniel

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.