My Tiny SA Ultra puts out a generator signal way lower than expected. As I keep reducing the output level, at some point it starts to get stronger on the connected receiver before disappearing below the noise way sooner than expected. I have tried it on several different receivers with the same result. I don't have another SA I can use to actually measure the output power level. I have been very careful to protrct the ports from static and always use attenuators between a transmitter and the SA port. The SA is a only a few weeks old so any suggestions as to what I might be doing wrong before I return it to the seller ? It passes all the self-tests fine.