- Can be the LO3: check the ``lock'' indicator.
- Can also be the filters. Check several bandwidths to disentangle between various filters. Make a BANDPASS calibration, analyse it with CLIC: check whether autocorrelation mode is OK.
- If autocorrelation not correct, sampler problem most likely.
- If OK, digital problem in the correlator board or GigaLink. Try resetting the micro.
If problem persists, call maintenance. In all cases notify maintenance team.