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In this paper, we observe the interaction of the electromagnetic wave with high-speed electrons arising from the corona and spark discharges in the cavity. With the low level of the high-speed electron in the cavity, the initial frequency set by the cavity is being split mainly into a lower and higher frequency in comparison to the initial frequency. With the high level of the high-speed electron in the cavity, the system yields a good microwave generation in air at the single frequency, even at low voltages. The high level of the high-speed electrons is due to the corona discharges that are producing in situ generated electron beams on the helix, which is made of copper wire that is 1.25 mm in diameter. Two models are presented to account for the waveform of the radiation and its FFT.