on a group of the form $3^{7}{:}sp(6,2)$

‎the purpose of this paper is the determination of the inertia‎ ‎factors‎, ‎the computations of the fischer matrices and the ordinary‎ ‎character table of the split extension $overline{g}=‎ ‎3^{7}{:}sp(6,2)$ by means of clifford-fischer theory‎. ‎we firstly‎‎determine the conjugacy classes of $overline{g}$ using the coset‎ ‎analysis method‎. ‎the determination of the inertia factor groups of‎ ‎this extension involved looking at some maximal subgroups of the ‎maximal subgroups of $sp(6,2).$ the fischer matrices of‎ ‎$overline{g}$ are all listed in this paper and their sizes range‎ ‎between 2 and 10‎. ‎the character table of $overline{g},$ which is a‎ ‎$118times 118 mathbb{c}$-valued matrix‎, ‎is available in the phd‎ ‎thesis of the first author‎, ‎which could be accessed online‎.