A method and device for test receiving alternative reception frequencies without interrupting the reception of specific user terminating information by use of only one reception chain. In certain information streams, such as that of a terrestial digital video broadcasting system (DVB-T), there is no provisions for time slots when an alternative reception frequency can be test received without interrupting flow of information. According to the invention the continuous flow of information is classified into specific user terminating information which is desired by the receiver in question, or user of, and into other information. The behavior of the specific user terminating information is used to determine when an interruption of the other information can occur for test receptions of alternative reception frequencies without interrupting the reception of the specific user terminating information.