Driver for quasi-resonant communication with a mobile transponder

A driver for communication with a transponder,

• for a vehicle at least one of access and start system, the driver comprising:
• a resonant circuit;
• a frequency detection apparatus;
• wherein after a first transmission at a first transmission frequency and after driver-side reception of a response of a transponder, and after driver-side determination of response frequency of the response using the frequency detection apparatus, said response frequency being set at the driver as a second transmission frequency at which the driver is then intended to transmit;
• wherein the resonant circuit has a higher driver resonant frequency than the first transmission frequency and the second transmission frequency;
• and
• a controller configured to change pauses between transmissions at the driver resonant frequency, and thus generating the second transmission frequency upon a second transmission of the driver;
• the driver configured to change its transmission frequency from the first transmission frequency to the second transmission frequency, the response frequency being set at the driver as the second transmission frequency at which the driver is intended to transmit, the controller generating a pause at least one of before and after respectively a transmission at the driver resonant frequency;
• wherein the one or more pauses is selected for transmission at the second transmission frequency in a different at least one of length and number than for transmission at the first transmission frequency.