I want to test the performance of AM, FM and DAB radio in RTL-SDR. I want to measure sensitivity, adjacent channel selectivity, cross-modulation/blocking, and third-order intermodulation to be some of the metrics. From the ETSI document for broadcast sound receivers, it is found that to conduct these performance tests, I need 2 signal generators, 1 signal analyzer, and an RF combiner. Since I don't have much experience working with this equipment, I don't know which type of signal generator/combiner to buy (as there are so many types in the market).
Can someone provide me details on which equipment will be suitable for testing AM/FM/DAB?