Rubidium Clock

Have anybody tried it with aurender w20 with a word clock input & it already has oxco clocks ? 

Any device you connect to one of the master clocks from Cybershaft should support 50-ohm 10 Mhz master clock connections; note that there is much discussion in a couple of forums as of the last month or two that quotes statements from manufacturers using hard facts that claim that using a 75-ohm cable in place of 50-ohm is acceptable for short runs (1-meter, 1.5 meter, etc...typical between such devices). I happen to be using spec-compliant 50-ohm capables. That stated, the discussion and statements from 3 different clock manufacturers including Esoteric, Cybershaft and one other (think it is SRS or Antelope) state that for a 50-ohm input and output pair, using 75-ohm cables for these lengths does not represent a probable issue.  No discussion I have seen states that you can connect a 75-ohm cable to a 75-ohm input and route a signal (such as one from a Cybershaft clock of SRS PERF10, Antelope Isochrome 10MX, etc..>) made for 50-ohm and 10 Mhz in nature to a 75-ohm port.

I just read the Aurender W20 manual and spec. sheet on line; they are very good in terms of the step by step involved in setting up the server and playback software however, they do not seem to make any statements about how to setup/configure the clock input for what they state they support (from their website and product manual: "It supports both word clock (dCS DACs or similar) or Master Clock.(MSB DACs or similar)"

I would suggest you get specifics from Aurender regarding what this input on their W20 truly supports first and go from there. I’ve sent a question as well using their online form; if I heard back I will let you know.  The key questions;

- is their input a 75-ohm or 50-ohm connect (based upon context on their spec-sheet, I'd guess 75-ohm?
- does it truly support "master clock" frequency of 10 Mhz...?
- how do you configure the W20 to tell it which type of clocking input it is receiving?

Response from Aurender

The W20 supports 44.1kHz clock inputs at 2x and 4x, 48kHz clocks at 2x and 4x, and 10MHz clocks; we also support MSB clock systems. All clocks must use a 75ohm BNC type connector.

If the Cybershaft meets these specifications, then it should work correctly with the W20.

Used to own MSB Select with Femto clock  . Just direct connection without any set up 

In professional studios /  industrial applications of 10M clocking, one may very well see cabling of lengths of 10 meter, 20 meters connection the various equipment.

In his situation, using a 75ohm cable will cause a decrease in voltage reaching the equipment in question, potentially causing locking/syncing problems or possibly not locking at all.

There would not have these issues typically over shorter lengths of 1 meter even if there IS a voltage drop, but to a lesser degree and still capable of locking.

Now, say for the Aurrender W20, there is 1 bnc clock connector, 75 ohms presumably. This would be correct for 44.1, 48khz or multiples, BUT not for a pure 10m sine input. 

10M sine signal, you would want a 50 ohm cable

10M TTL signal, you would want a 75 Ohm cable.

More clarification is required from Aurender, even so the bnc on the unit may have only been considered for TTL Levels.

Sure, the unit will still most likely lock with a 50 ohm cable.

Thank you both for the feedback...here was Aurender's response to my questions yesterday. I've included it as they put a bit of additional detail/wording;

"- The BNC input is 75ohm only, and does not support a 50ohm connection.

- The input supports 44.1kHz 2x and 4x, 48kHz 2x and 4x, and 10MHz. It also supports MSB’s work clock frequencies. These are typically automatic, though they may need to be adjusted by the user on the manufacturer’s clock, manually (Esoteric, for example). MSB uses proprietary clock frequencies which we are compatible with. dCS uses either 44.1kHz (2x and 4x) or 48kHz (2x and 4x).

- Based on the above, we should work with any clock system that uses a 75ohm BNC connector and operates at any of these frequencies. We do know that Esoteric clocks require a manual adjustment by the user."