As long ago as 1960, the vulnerability of radio astronomy to interference was being documented by the International Radio Consultative Committee (CCIR) of the International Telecommunication Union ...

The Panel on Frequency Allocations and Spectrum Protection for Scientific Uses calls attention to the statement of task of the National Research Council’s Committee on Radio Frequencies 1 (CORF): ...

Using a double-conversion design, ED Series UVS PlusR frequency converters accept an input of 50, 60, and 400 Hz and yield a fixed output of 50 or 60 Hz with voltage regulation and backup with an ...