We are using the LMK04805 with a CVHD950 122.88MHz VCXO and a 30.72MHz TCXO, then we set the output divider of clock out 0 to 1, so we have 2293.76MHz at the output. Phase noise looks ok above 10Hz. But on the spectrum analyzer we can see some very slow jumps or swings of with a frequency of less than +-1..10Hz and a period of 0.1..1s. We also take the reference instead of the TCXO from an Anritsu MG3692B with the same 30.72MHz and can't see a difference. If we set the Anritsu to 2293.76MHz and connect it to the spec, it is, as expected, without any swinging. I have attached the TICS file of our settings. Any ideas?