  This work presents a systematic investigation of the influence of weather
conditions on the calibration errors by using Gaussian fitness, least
chi-square linear fitness and wavelet transform to analyze the calibration
coefficients from observations of the Chinese Solar Broadband Radio
Spectrometers (at frequency bands of 1.0-2.0 GHz, 2.6-3.8 GHz, and 5.2-7.6 GHz)
during 1997-2007. We found that calibration coefficients are influenced by the
local air temperature. Considering the temperature correction, the calibration
error will reduce by about $10\%-20\%$ at 2800 MHz. Based on the above
investigation and the calibration corrections, we further study the radio
emission of the quiet-Sun by using an appropriate hybrid model of the quiet-Sun
atmosphere. The results indicate that the numerical flux of the hybrid model is
much closer to the observation flux than that of other ones.
