  We present the results of our 2nd radial velocity monitoring campaign,
carried out with the \'Echelle spectrograph FLECHAS at the University
Observatory Jena in the course of the Gro{\ss}schwabhausen binary survey
between December 2016 and June 2018. The aim of this project is to obtain
precise radial velocity measurements for spectroscopic binary stars in order to
redetermine, verify, improve and constrain their Keplerian orbital solutions.
In this paper we describe the observations, data reduction and analysis and
present the results of this project. In total, we have taken 721 RV
measurements of 11 stars and derived well determined orbital solutions for 9
systems (7 single-, and 2 double-lined spectroscopic binaries) with periods in
the range between 2 and 70 days. In addition, we could rule out the orbital
solutions for the previously classified spectroscopic binary systems HIP107136
and HIP107533, whose radial velocities are found to be constant on the
km/s-level over a span of time of more than 500 days. In the case of HIP2225 a
significant change of its systematic velocity is detected between our
individual observing epochs, indicating the presence of an additional
companion, which is located on a wider orbit in this system.
