For using the internal clock on your Cantar X as the master clock when setting up your Tentacle devices, please make the following selection in the Cantar X menu: Audio & Timecode Parameters -> Ltc level -> Medium. Every time the Cantar X is powered down, sync is lost and you need to re-sync the Tentacle device.
We recommend to work with external timecode and us a Tentacle SYNC E as the master clock. Our SYNC E devices stay in sync for up to 24 hours after being synchronized at the start of the day. Their built-in batteries last even longer. If you connect a Tentacle to your Cantar X and select in the menu as Timecode source -> Ext. Clock, you can power the Cantar X down without the need to re-sync afterwards.