Pete KE9OA wrote:
. . .
In conclusion, make sure that the IMD isn't being generated in your test
setup, and make sure that you are not exceeding the recommended RF input
level to the SBL-1.

A quick test for spurs being generated by the spectrum analyzer is to
increase the spectrum analyzer input attenuation by 10 dB. Real spurs
will drop 10 dB. Most spurs generated by the analyzer will drop a
greater amount -- 20 dB if they're second order, 30 dB if they're third
order, and so forth. If any spurs do drop more than 10 dB, you have to
reduce the SA attenuator setting or the input signal level to the SA --
at least the level of the signal(s) generating the spurs.

Roy Lewallen, W7EL