> So... Here's a fun one for the RF people over the holiday. > We need to xmit data from a logger INSIDE a body over a range of a > few feet. > And it has to be micro power. > And it has to be faster than 56Kb. Data ! More data. Must have data! To deal with your data :-) How fast minimum? How much data / What duty cycle? (eg 112 kbps continuous or 10% bursts of 100 bits or ...) How deep inside? How much range? Does orientaton affect this? Add this answer to next question's answer. Cooperative target or passive? (target comes to receiver / target orientates to receiver / target doesn't know receiver location / target essentially doesn't know receiver/transmitter exist/ ...) Lifetime? (Hours / days / months / indefinite?) Can it be powered by remote powering? What known regulatory issues? (Person / animal / cadaver / ...?) Target actve/passing by/stationary/area restricted/ ... . RF? (Capacitive, inductive, near field, optical, ...) (Having the whole 'body' inside an inductive powering loop could work very well but may not be permissible in your application. If you want Russell to see this answer you'll need to include a line with "::" in it (quotes optional). Which could be this line. Or send a copy to him directly. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist