An eight channel telemetry system for the transmission of biomedical signals

An eight channel telemetry system is presented which has low dimensions, low weight and is easy to use. The transmission is in the 430 MHz band on the basis of pulse-width modulation in a time-multiplex mode. A standard 9 volt battery offers a minimum of 15 hours operation with an accuracy of 1%. The upper limit frequency is currently at about 100 Hz. A 9th channel serves to monitor the function of the system.