Technology Index 　 　 （receiving machine）dest type (transmitter)hand hold receive frequency ：UHF550MHz carrier wave :UHF550MHz frequency stabilization limit: 0.002% frequency stabilization :0.002%(better than 15ppm locked quartz crystal ) delicacy degree:10/uV S/N=50dB transmit power:30mW near frequency disturbance ratio:>80dB current wear:<25mA mirror image disturbance ratio:>80dB subsidiary syntonic wave: SNR: >90dB making type:frequency modulation swith time for automaticaly choosing signal :200ms afrequency modulation deflection limit:(+/-25KHz) expand ration:=1:2 compression ratio:=2:1 audio frequency output:May chose 0-300mV sound-collect implement: super heart-type pointing to active circle type or capacitance subassembly type receiving channel:2 route alternate:1.5V*3 ouput port: 1 route three acicula balance/mixed pout life for using battery:continuous 5H electric source voltage: DC18v antenna:inner installing antenna power dissipation:2w 　 antenna: hight frequency card port antenna, two out of four type 　 system intergrated index 　 dynamic range:>110dB 　 T.H.D:<1% 　 frequency respondence:50Hz-15KHz(+/-3