  We present an analysis of optical and near infrared spectra of the eclipsing
symbiotic system FN Sgr. In particular, we have determined for the first time
spectroscopic orbits based of the radial velocity curves for both components. A
set of blue absorption lines resembling an A-F type star is present in all our
spectra. They seem to be associated with the hot component but the best orbital
fitting corresponds to a larger eccentricity. We have also studied spectral
changes and photometric variations in function of both the hot component
activity and the orbital motion.
