Patent ID: 8311494
Filing Date: 2012-11-13
Classification: H04B

Abstract:
1. A test unit for testing frequency characteristics of at least one component of a transmitter of modulated signals, comprising: a data source for generating a test pattern of data; a test unit output connected to said data source and connectable to an input of said at least one component, to input said test pattern of data to said at least one component; and a memory to store a first predetermined data sequence and a second predetermined data sequence; wherein said data source is connected with an data input to said memory, and said data source is arranged to generate said test pattern of data including said first and second predetermined data sequences; and wherein when a modulated signal is generated in accordance with said test pattern of data, the modulated signal includes a first signal part with a first frequency spectrum caused by said first predetermined data sequence and a second signal part after said first signal part, wherein second signal part has a second frequency spectrum caused by said second predetermined data sequence.