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I'm receiving a mixer saturation warning on my MS2721B, what does it mean and what can I do about it?
answer

The MS272xB, MS271xB and MT8222A have a broadband detector before the first mixer. If the overall signal environment contains enough signal power to cause the mixer to compress the output signal, the mixer is "saturated". The fix is to reduce the amplitude of signals hitting the mixer by one or more of three approaches. If the signal is in-band, or is the signal you want to measure, turn off the preamplifier as a first step. If that doesn't reduce the amplitude enough, start adding input attenuation until the problem is resolved. If the signal is out-of-band, those two methods will work but a better way may be to insert a bandpass filter into the signal path to reduce the amplitude of out-of-band signals since that will preserve in-band sensitivity.

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