Max FM peak +-

Hiya
Just want to check – is there a max peak +/- that the analog demod page will show (using spike on a bb60c) ?

I’m using a carrier wave (between 300k and 5G hz) modulated by 1kHz frequency, and varying the depth. However, I seem to be unable to get the measurement to show any more than ~ +- 150kHz. I can measure them manually correctly on the zero span mode and correctly see , for example, a 160kHz depth, but it is never reported correctly on the analog demod screen.

Hello sajdenman,

The audio demod mode does have a limiting bandwidth of about 300kHz.

You could manually measure your frequency deviation in zero-span mode using the FM plot and markers to measure the peaks and troughs. I don’t know if this would be sufficient for you.

Let me know if you have additional questions.

Regards,
A.J.

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