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The gain of the North-Georgia Radio Telescope (NERT) receiver is sensitive to changes in the receiver temperature (TR). To improve the accuracy and repeatability of the measured radio flux (output voltage of the square-law detector), a temperature-gain calibration must be determined and applied to the raw output voltage. To determine the calibration, NERT is pointed to the North Celestial Pole which for our non-tracking system allows the system to point in the same celestial position continuously and provides a source of constant radio flux. A calibrated noise source (CNS) is also used for a stronger constant flux. During a transit observation of a program object such as the Sun, the receiver temperature and the raw output voltage are recorded as a function of time. The temperature scan and the temperature-gain calibration are used to create a gain-corrected output voltage normalized to a TR = 20o C and a gain of 10 dB. This allows the system to measure the same value of the output voltage for a given observed flux despite the temperature of the receiver, ensuring accurate and repeatable measurements.


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18 Jul 2022
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  • Subject
    • Physics & Astronomy

  • Institution
    • Dahlonega

  • Event location
    • Nesbitt 3110

  • Event date
    • 25 March 2016

  • Date submitted

    18 July 2022

  • Additional information
    • Acknowledgements:

      Joseph Jones