Thanks for explaining it beautifully.
Does that mean whenever I use harmonic balance simulator, I have to start from 0 GHz to maximum frequency that will be generated by HB simulator in the momentum analysis?
For this case, I am only interested to see if the oscillator is working on its design frequency with the amplitude I got from schematic. ADS will generate mesh at the highest frequency, so it will be very cpu hungry. I hope it won't give much changes at 6 GHz oscillation result that I already got from low range (5 - 8 GHz) of frequency simulation.