Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982loele..62...83d&link_type=abstract
L'Onde Electrique, vol. 62, Aug.-Sept. 1982, p. 83-94. In French.
Astronomy and Astrophysics
Astronomy
1
Radio Astronomy, Solar Instruments, Solar Radio Emission, Spectrographs, Background Noise, Broadband, Data Compression, Data Recording, Diplexers, Electrical Impedance, Log Periodic Antennas, Preamplifiers
Scientific paper
The installation of a solar radio spectrograph at the Nancay radioastronomy station allows viewing in the 110-469 MHz range and the detection of polarized signals. The radio emissions are received by a 6 m diam antenna equipped for automatic tracking and circular polarization. The system filters noise by means of a preamplifier, with a large impedance present in the antenna-preamplifier link. Intermodulation is prevented by a tree of diplexers followed by a mixer matrix. Frequency resolution functions at the level of 120 channels of 1 MHz bandwidth or 100 channels of 200 kHz bandwidth each, positioned anywhere over the total range of the instrument. Sensitivity is adjustable over a dynamic range of 0.02-50 dB.
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