Receiver gain calibration for radio observations at the Waseda Nasu Pulsar Observatory

K. Niinuma*, M. Kuniyoshi, N. Matsumura, K. Takefuji, S. Kida, A. Takeuchi, R. Nakamura, S. Suzuki, H. Ichikwa, K. Asuma, T. Daishido

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)


    We have started programs at the Waseda Nasu Pulsar Observatory to identify EGRET γ-ray sources and to search for radio transients. The observed frequency was 1.4 ± 0.01 GHz, and eight-element spherical dish antennas were used as four pairs of interferometers, with each element 20 m in diameter. The observable region was ±5° from zenith, covering a region of sky 32° ≤ δ ≤ 42° in declination. For accurate flux measurement, we developed a receiver gain calibration system using Johnson-Nyquist noise; the system was compact, inexpensive, and easily maintained. We describe the system and recent results of radio source monitoring.

    Original languageEnglish
    Pages (from-to)112-121
    Number of pages10
    JournalPublications of the Astronomical Society of the Pacific
    Issue number851
    Publication statusPublished - 2007 Jan

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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