Is the one-way velocity of light measurable?

A new method to study the one-way velocity of electromagnetic (e.m.) radiation is proposed which use interferometric detections of microwaves. Time intervals of a fraction of the wave period (down to 1014s) can thus be measured. A set of generalised space-time transformations between inertial systems (GT) is used, defined by: a) the two-way velocity of e.m. radiations is 'c' in all inertial system and in all directions; b) clock retardation by the usual relativistic factor exists at least whit respect to one inertial frame. In these GT only the 'synchronisation parameter' e1 is free. For some choice of e1 Lorentz transformation obtain. GT whit different e1 predict different one way velocity of light. GT are nevertheless equivalent to one another in describing our experiment if time dilation in the source is taken into account. This result agrees with the conventionality idea of the one-way velocity of light