The META control room.
Designed in 1983, META's hardware consisted of GaAsFET low-noise front ends in each polarization, image-reject downconverters with programmable phase-continuous 2nd LO, 7-bit quadrature digitizers, a 144-point channelizing DFT feeding an array of 144 68000-based 64K-point FFTs, and a central "workstation" of modest performance. In an analysis of 5 years of data, during which 60 trillion channels were searched, we found 37 candidate events exceeding the average detection threshold of 1.7e-23 W/m^2, none of which has been detected upon repeated reobservations. For a technical summary, see "Five Years of Project META: An All-Sky Narrowband Radio Search for Extraterrestrial Signals," by Carl Sagan and Paul Horowitz in the Astrophysical Journal, vol. 415, no. 218, Sept. 1993, pp. 218-235. A non-technical version of this article appears in The Planetary Report as "Project META: What Have We Found?," vol. 13, no. 5, Sept/Oct. 1993, pp. 4-9. This issue is available from The Planetary Society.