① design and production of a main station, all the way to send voice signals, the firing frequency at 30MHz ~ 40MHz to choose between the launch peak power less than 20mW (50  load resistance on the determination false), radio frequency signal modulation bandwidth and self- , the main station to send signals using the microphone input and line input in two ways ② design and production of a slave, to receive the frequency corresponding to the main station, from the station battery power must be used with headphones to listen to voice signals ③ When the transmission signal of 300Hz ~ 3400Hz sine wave, the removal of land, the antenna, with a power attenuation of about 20dB attenuator connecting to the main, from the antenna terminal station through the oscilloscope to observe from the headset on both ends of the receiving station waveform, waveform should no significant distortion ④ owners, interior communication distance from the station is not less than 5 meters, the

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