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tinySA Ultra and total noise source power?
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Amaruk:
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=82

In 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!
Amaruk:
Update: I cross-posted this question over on the tinySA group and here is the answer I got from Erik:

"When not used above 800MHz the input low pass filter removes all power above 800 MHz so the answer is 800 MHz
Do not measure noise above 800MHz as the Ultra mode does work well with noise."

Excellent answer. Good to know!!
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