Are they saying that this is what caused the strange spikes you saw in the AM signal? Because of the sample rate derived from the memory length?
Not entirely sure ![Confused :-//](https://www.eevblog.com/forum/Smileys/default/confused0024.gif)
Dave,I was going to point out that an overmodulated AM signal like you used will produce harmonics of the carrier & sidebands,as well as intermodulation products between these harmonics & the original signals.
I thought maybe the GWInstek was having problems with aliasing with
these signals.
If so,it's a sampling rate problem,but wouldn't happen with a lower % of modulation.