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Context. The microquasar 1E 1740.7-2942 is a source located in the directionof the Galactic Center. It has been detected at X-rays, soft gamma-rays, and inthe radio band, showing an extended radio component in the form of adouble-sided jet. Although no optical counterpart has been found so far for 1E1740.7-2942, its X-ray activity strongly points to a galactic nature. Aims. Weaim to improve our understanding of the hard X-ray and gamma-ray production inthe system, exploring whether the jet can emit significantly at high energiesunder the light of the present knowledge. Methods. We have modeled the sourceemission, from radio to gamma-rays, with a cold-matter dominated jet model.INTEGRAL data combined with radio and RXTE data, as well as EGRET and HESSupper-limits, are used to compare the computed and the observed spectra.Results. From our modeling, we find out that jet emission cannot explain thehigh fluxes observed at hard X-rays without violating at the same time theconstraints from the radio data, favoring the corona origin of the hard X-rays.Also, 1E 1740.7-2942 might be detected by GLAST or AGILE at GeV energies, andby HESS and HESS-II beyond 100 GeV, with the spectral shape likely affected byphoton-photon absorption in the disk and corona photon fields.Comment: 4 pages, 1 figure, to appear in A&A, in pres

On the multiwavelength spectrum of the microquasar 1E 1740.7-2942