The invention refers to a transmitter that emits data in the form of a group of at least two partial telegrams that together include the data and that are shorter than an individual telegram comprising the data. The transmitter emits the group of partial telegrams according to a hopping pattern that refers to times and/or transmission frequencies of the emission of the individual partial telegrams. Furthermore, the transmitter emits the group of partial telegrams several times and at least twice. Furthermore, the invention relates to a receiver and corresponding methods.