  Interaction of non-relativistic electrons with single crystal target may
produce coherent x-rays. That is the result of interference between two known
x-ray generation mechanisms having orientational behavior, namely parametric
x-rays and coherent {\it Bremsstrahlung}. Experiments aimed to PXR research
were performed with 50-100 keV electrons and its distinctive features were
observed. Requirements to the experimental set-up, detector instrumental
response, and targets as well as experiment geometry are discussed in detail.
Series of PXR spectra in various conditions were recorded and their distinctive
features were observed. Tuning of radiation frequency with crystal-target
rotation was observed for the first time for low energy electrons. Dependence
of the x-ray frequency on the beam energy was detected. Soft PXR peak with
energy below 1 keV was observed for the first time. Possible applications of
PXR for structure analysis and crystallography are discussed. These results are
obtained in the framework of ISTC project {#}B626
