Measurements of Radiation Characteristics of a Set of Electronic Backend Devices for Radio Astronomy

In the developing radio astronomy increasingly more high-speed digital backend systems and control systems are being used, worsening electromagnetic environments for observation. Measurement of radiation characteristics of such electronic devices can help mitigate Radio Frequency Interferences (RFI) with the shielding technology. To meet the requirements of electromagnetic compatibility of the system improvement for the XJAO (Xinjiang Astronomical Observatory) Nanshan 25m telescope and the design of the planned XJAO 110m telescope, we have developed a system to measure radiation characteristics of electronic devices in radio astronomy. We have calibrated the system using a noise source Agilent 346C and the Y-factor method. Using the system we can obtain the radiation spectra of each electronic device in its on and off statuses with other devices turned off. We present some processed spectra of the backend systems of the Nanshan 25m telescope so measured by this system. The presentation includes their calibration and plots. The spectra show the radiation characteristics. Overall our system can provide RFI data for effective analyses, and thus it can appreciably help improving and designing systems in radio astronomy. It should have significant engineering applications.