  The operation of a wide field-of-view (WFOV) Cherenkov telescope is
described. The detection of extensive air showers (EAS) of cosmic rays (CR) is
based upon the coincidence with signals from the Yakutsk array. The data
acquisition system of the telescope yields signals connected with EAS
development parameters: presumably, shower age and position of shower maximum
in the atmosphere. Here we describe the method of signal processing used to
reconstruct Cherenkov radiation signals induced by CR showers. An analysis of
signal parameters results in the confirmation of the known correlation of the
duration of the Cherenkov radiation signal with the distance to the shower
core. The measured core distance dependence is used to set an upper limit to
the dimensions of the area along the EAS axis where the Cherenkov radiation
intensity is above half-peak amplitude.
