**6. Conclusion**

The energy of conducted emissions of the CD that can be affirmed is located in the frequency range of 8–32 MHz. The fundamental frequency is in 8 MHZ, which indicates that the frequency fundamental of the corona discharge is independent of the source configuration.

A summary is presented in **Table 3** for the analysis of the spectrogram of radiated CD emissions.

The temporal and frequency responses of the radiated emissions of the CD present the energy concentration in the same frequency range, which indicates that the process used in the measurements is adequate.

In relation to the radiated emissions in the frequency range from 0.3 to 30 MHz, the three measurement processes agree, which indicates the RBW selected in both instruments is adequate (10 kHz). In the case of the 30–300 MHz frequency band, in both instruments, RBW of 120 kHz was set as specified in CSPR-1-1. However, there are differences according to the results. For this case, the EMI test receiver can be reliable up to 100 MHz. The opposite for the spectrum analyzer, which has a better resolution because narrowband emissions can be identified at 120 and 260 MHz. In the band from 300 MHz to 1 GHz, having the same RBW (120 kHz) on both instruments, the EMI test receiver is unresponsive; it only presents background noise. Instead, the spectrum analyzer makes it possible to determine narrowband emissions. Finally, the results show that in the 100 MHz–1 GHz band, the radiated emissions from corona discharge are not a threat to radio communication systems.


#### **Table 3.**

*Concentration of energy in the spectrograms.*

### **Acknowledgements**

The authors kindly acknowledge the grant awarded by the National Polytechnic Institute (IPN) and the National Council of Science and Technology (CONAYT) Mexico.
