BNC Cable is RG6 the best?

@ozzy 0.05m = 5cm ????

If you can make such short cable then you don't have reflections, no matter what you use.

Sorry slip up, wrong decimal point.
.5 Meter (or 1/2" Meter). I suppose I could go to 1 meter if it matters.

ozzy

@ozzy   It all depends on the slew rate of your clock.  For typical transport (25-30ns) you need at least 1.5m or less than 0.5m, but the latter should include all connections (inside of the clock and DAC), so safer would be <0.25m for the cable.   I would go with safer choice: >1.5m.  1m might be OK if your clock transitions are faster (likely), but you have to experiment.  Whole point is that reflection on impedance boundary at the end (if any) should miss (be late) midpoint of transition that originated it.  It is almost impossible to measure characteristic impedance and very difficult to measure slew rate, because any capacitance (scope probe) affects it.  You have to experiment.

The Black Cat Silverstar cables do a great job if you need 75ohm BNC.  Not cheap but not super expensive either they do a great job, are well constructed and reliable cables.

Apogee Wyde Eye are supposed to be very good for word clock if you can find one.

kijanki,
I could go 1.5M but the AfterDark clock and the EtherRegen are very close together and that would mean a lot of cable drooping.

audiojedi,
I'll take a look at the Black Cat Silverstar.

Since, I have the RG-6 cable already terminated with a BNC I'm going to try that first. I still wonder what the clock transfers. Is it audio signal???

ozzy