 when the toroidal magnetic field is 0 T on axis. The antenna is installed inside of the vacuum vessel. A new vacuum window is developed by using 00 μm thick mica film and 0.0 mm thick gold gasket. The filter bank of low pass filter, notch filter, and Faraday isolator is used to reject the electron cyclotron heating high power at attenuation of 00 dB. The full frequency band is swept in 00 μs. The mixer output is directly digitized with sampling rate of 000 MSamples/s. The phase is obtained by using wavelet transform. The whole hardware and software system is described in detail and the measured density profile is presented as a result.  