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We report results of a serendipitous hard X-ray (3--20 keV), nearly all-sky(|b|>10deg) survey based on RXTE/PCA observations performed during satellitereorientations in 1996--2002. The survey is 80% (90%) complete to a 4$\sigma$limiting flux of ~1.8 (2.5) e-11 erg/s/cm2 in the 3--20 keV band. The achievedsensitivity in the 3--8 keV and 8--20 keV subbands is similar to and an orderof magnitude higher than that of the previously record HEAO-1 A1 and HEAO-1 A4all-sky surveys, respectively. A combined 7000 sq. deg area of the sky issampled to flux levels below 1e-11 erg/s/cm2 (3--20 keV). In total 294 sourcesare detected and localized to better than 1 deg. 236 (80%) of these can beconfidently associated with a known astrophysical object; another 22 likelyresult from the superposition of 2 or 3 closely located known sources. 35detected sources remain unidentified, although for 12 of these we report alikely soft X-ray counterpart from the ROSAT all-sky survey bright sourcecatalog. Of the reliably identified sources, 63 have local origin (Milky Way,LMC or SMC), 64 are clusters of galaxies and 100 are active galactic nuclei(AGN). The fact that the unidentified X-ray sources have hard spectra suggeststhat the majority of them are AGN, including highly obscured ones (nH>1e23cm^{-2}). For the first time we present a logN-logS diagram for extragalacticsources above 4e-12 erg/s/cm2 at 8-20 keV.Comment: 19 pages, 9 figures. Accepted for publication in A&

RXTE all-sky slew survey. Catalog of X-ray sources at $\mathsf{|\textit{b}|>10^\circ}$