Hi all,

Sorry if this has already been explained/solved.
I programmed Tutorial 3 onto a SNAP board and noticed some unexpected
spikes in the spectrum.  I have set up the hardware as explained in the
python script with a 10 MHz, 8dBm  reference going into the SYNTH_OSC SMA
(3rd SMA from the left).

The attached figure shows the spectrum with no input going into the SNAP
board. There are large spikes in the spectrum every 50 MHz with the largest
at 200 MHz.

When I add a signal to the SNAP board, I can see it in the spectrometer at
the correct frequency
but the other spikes are still present.

Do you know what is causing these spikes and how they can be removed? Any
help would be greatly appreciated.

Thanks,
David

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