1112 
MONITORING 
Figure 8. — Plot of a crystal that has insufficient drive. 
the performance requirements of the complete 
telemetry system. For transmission from small 
animals and for implantation, battery size and 
power capability as related to current drain and 
longevity are pertinent factors that restrict 
the designer's use of many familiar circuits. 
More imagination has to be utilized in designing 
and assembling a realizable high performance 
system. 
This design example describes a circuit that 
is employed for pheasant research by the Wild- 
life and Fisheries Sciences Department at South 
Dakota State University. The experiment re- 
quired that there be simultaneous transmission 
