I did a measurement on my 26MHz crystal oscilator and found something strange with different setting as below:
with ref level set to 10 dbm i got the weird measurement with a lot of sideband ripples. Did i over compress my signal? But the power lvl is only -13.67dbm, i assume using ref lvl 10 dbm is ok.
with ref level set to 20 dbm, i get a cleaner output.
Anyone tell me which setting is correct? or something wrong with my crystal oscilator output. thanks.
And even cleaner with 30 dBm reference level, because spurs are completely hidden by SA noise...
Overdriving the SA will generate oscillator harmonics, not a 600 kHz fence. Looks more like harmonics of a switch mode converter or logic circuit. And you surely don't overdrive it with the oscillator signal. You may want to watch 0 to 100 MHz band to if there are other high level signals.
And even cleaner with 30 dBm reference level, because spurs are completely hidden by SA noise...
Overdriving the SA will generate oscillator harmonics, not a 600 kHz fence. Looks more like harmonics of a switch mode converter or logic circuit. And you surely don't overdrive it with the oscillator signal. You may want to watch 0 to 100 MHz band to if there are other high level signals.