  The discovery of a significantly large anomalous Hall effect in the chiral
antiferromagnetic system - Mn$_3$Ge - indicates that the Weyl points are widely
separated in phase space and positioned near the Fermi surface. In order to
examine the effects of Fe substitution in Mn$_3$Ge on the presence and location
of the Weyl points, we synthesized (Mn$_{1-\alpha}$Fe$_{\alpha})$$_3$Ge
($\alpha=0-0.30$) compounds. The anomalous Hall effect was observed in
compounds up to $\alpha=0.22$, but only within the temperature range where the
magnetic structure remains the same as the Mn$_3$Ge. Additionally, positive
longitudinal magnetoconductance and planar Hall effect were detected within the
same temperature and doping range. These findings strongly suggest the
existence of Weyl points in (Mn$_{1-\alpha}$Fe$_{\alpha})$$_3$Ge
($\alpha=0-0.22$) compounds. Further, we observed that with an increase in Fe
doping fraction, there is a significant reduction in the magnitude of anomalous
Hall conductivity, planar Hall effect, and positive longitudinal
magnetoconductance, indicating that the Weyl points move further away from the
Fermi surface. Consequently, it can be concluded that suitable dopants in the
parent Weyl semimetals have the potential to tune the properties of Weyl points
and the resulting anomalous electrical transport effects.
