Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..146..191z&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 146, no. 1, p. 191-197.
Physics
Drift (Instrumentation), Fine Structure, Microwave Equipment, Receivers, Solar Instruments, Solar Spectra, Analog To Digital Converters, Antenna Design, Attenuators, Error Analysis, Microwave Attenuation
Scientific paper
A query on the behavior of a 2.84 GHz ms-resolution receiver developed by Jin et al. at the Beijing Astronomical Observatory (BAO) in the early 1980s is raised in this paper. As an inappropriate use of an electrically controlled attenuator (ECA) and a A/D converter in the receiver, taking an attenuation by 12 db (i.e., a factor of 16) in the intermediate frequency (IF) flux for the equivalent of a data shift to the right by 4 bits, along with other design defects, could have made artificial errors creep into the observations. We throw doubt upon the 205 published solar ultrafast fine structure (UFFS) data taken with such a receiver.
Liu Yu-Ying
Zheng Le-Ping
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