Observers
BLAIR ET AL.
Link
Reference
BLAIR, D.G., NORRIS, R., WELLINGTON, K.J., WILLIAMS, A. and WRIGHT, A., "A Test for the Interstellar Contact Channel Hypothesis in SETI," Bioastronomy: The Search for Extraterrestrial Life, J. Heidmann and M. Klein (eds.), Springer-Verlag, Berlin, LNP 390, pp. 271-279 (1991).
Magic frequency search at pi times hydrogen line frequency. 1280 channels were arranged to sample three reference frames: solar barycenter, stellar barycenter and geocenter.