When using a noise source with a spectrum analyzer one has to think about the total power that goes into the SA as outlined in this excellent video:
https://youtu.be/l0xPmkf_EkI?t=82In this example Erik shows that his noise power level is around -30dBm with a resolution bandwidth of 621kHz on a standard tinySA. If we assume the noise source is flat over the entire band to 350MHz (563 times wider than the RBW of 621kHz) we can expect the total power to be NP=-30 + 10*log (563) = -3dBm which is below the maximum limit of 10dBm.
However, when it comes to tinySA Ultra the maximum input power is 6dBm and we have two modes of operation. In the normal mode the upper frequency is 800MHz and in the Ultra mode it changes to 3GHz but it can be used higher than that. Thus, what band do we have to integrate the noise power over to figure out if the input mixer in the tinySA Ultra will be overloaded or not? 800MHz? 3GHz? Or even higher?
Thanks!