  The asteroseismic and planetary studies, like all research related to stars,
need precise and accurate stellar atmospheric parameters as input. We aim at
deriving the effective temperature (Teff), the surface gravity (log g), the
metallicity ([Fe/H]), the projected rotational velocity (v sin i) and the MK
type for 169 F, G, K, and M-type Kepler targets which were observed
spectroscopically from the ground with five different instruments. We use two
different spectroscopic methods to analyse 189 high-resolution,
high-signal-to-noise spectra acquired for the 169 stars. For 67 stars, the
spectroscopic atmospheric parameters are derived for the first time. KIC
9693187 and 11179629 are discovered to be double-lined spectroscopic binary
systems. The results obtained for those stars for which independent
determinations of the atmospheric parameters are available in the literature
are used for a comparative analysis. As a result, we show that for solar-type
stars the accuracy of present determinations of atmospheric parameters is +/-
150 K in Teff, +/- 0.15 dex in [Fe/H], and +/-? 0.3 dex in log g. Finally, we
confirm that the curve-of-growth analysis and the method of spectral synthesis
yield systematically different atmospheric parameters when they are applied to
stars hotter than 6,000 K.
