Hi, I'm thinking of building a receiver for these wireless chest-belt transmitters. As far as I know they transmit on frequencies around 5 kHz. Has anyone already build such a receiver ? What about the maximum distance between transmitter + receiver ? Any suggestions ? regards, Reelf -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist