Abstract :
Steep wavefronts occur regularly or can be obtained very easily in many passive electrical circuits, i.e. circuits containing diodes, gaseous discharges, mechanical commutators, etc.... The selection of a particular frequency out of the correlated broad "interference" spectrum, by a single resonating circuit, and the radiation of this frequency by a connected antenna, is the basis of a passive short distance telemetering system, with a very broad application range.
