A system and a method for the transmission of signals representative of an event include a first low frequency clock (101) and a low frequency counter (102) for generating a first delay (TL), and a second high frequency clock (106) and a high frequency counter (104) for generating a second delay (TH). The system further includes a transmitter (105) for transmitting the representative signals after a delay from the event made up by the sum of the first and the second delay. The second delay can be generated also by an analogic device including for example a capacitor (99), and devices (97) for charging the capacitor up to the reaching of a preset voltage at its ends. A wireless transmission system according to the invention is utilized in a checking system with a contact detecting probe (1), for transmitting a signal representative of contact with the piece to be checked.