Today, I put together a quadrature sampling exciter (I guess that's what they're called? A Tayloe detector in reverse?) -- it's mostly a clone of the Ensemble Softrock RXTX, though a few changes for what I have on hand. It's just two pairs of inverting unity gain amplifiers into an SN74CBT3253 multiplexer. I attached my little signal generator to it, with two signals 90-degrees apart at 2KHz, and put a 40m low pass filter in front of it all. My oscilloscope's FFT function varies a lot, though if I turn on acquisition averaging I get a pretty stable result shown below. LO set for 7.050 MHz, so the LSB signal is at 7.048 and the unwanted sideband signal would be at 7.052. Is this an appropriate way to make measurements given that I don't have a fancy spectrum analyzer? I can definitely hear the difference between the two sidebands with my FT-818 nearby. I found that if I increase the amplitude at the signal generator, eventually the peaks that look like intermodulation spike up, and everything goes pretty bad . Is something like this suitable for SSB transmission in a homebrew transceiver? What should I be thinking about if I pursue a QSE like this instead of the other common designs? Thanks for any thoughts you might have!