Turnkey T&M solution
Testing the channel search function requires at least two simultaneous test signals that the receiver must find. Two test signals are also needed to test the automatic frequency change. As producers for the global market, car manufacturers must offer receivers for a wide variety of standards.
If the tuners are to be tested for different TV standards in parallel and independently of one another, two test signals are needed for each of these standards. This results in a considerable number of required test signals, which are best generated using one TV signal generator each. In this case, the configuration of a signal generator exactly matches the characteristics of a TV transmitter to be simulated. As content these signal generators use transport streams that were recorded in the area to be simulated. In this way, the same receive situation (frequencies and programs) that exists on-site during a drive test is reproduced in the lab.
A combiner network combines the output signals of these signal generators and feeds them to the individual test stations via a common cable. If the test stations are far away, e.g. in a different building, an electric/optical converter at the output of the combiner network is used. An optical waveguide subsequently transmits the signal generators' sum signal virtually loss-free to the test stations, where the signal is converted back into an electric RF signal.
The signal generators are housed in a 19" rack; they are usually located in a separate, protected room and are remote-controlled from a central PC via LAN. The transport streams are on a server, from where they can be copied to the signal generators, also via LAN.