Development and Testing of An S-band Flux Measurement System for the 40m Radio Telescope of the Yunnan Observatory

To improve the capability of the YNAO 40m telescope, we have developed a new S-band flux measurement system to solve the known problems. The newly developed devices include a counter-interference RF module and a radiometer for K-factor measurement. A new observation software is also introduced to match the system. The software is used for data collection, real-time data display, data recording/reduction. We have carried out certain tests after the new system was installed. The ON/OFF observation mode for a point source was adopted. The results after the data reduction and analysis show that the observational sensitivity of our new system is close to the theoretical value. The new system has obvious improvement over the old system in use with the telescope.