Master Clock for your EtherREGEN

[yy]

I have read the 20 pages of this topic, very interesting!

 

Thanks to @MartinT and Uptone team for all your inputs and advices.

 

I would like to try the adventure of a Master clock.

I have 2 devices with input clock, the ER (10Mhz) and a Merging NADAC (692KHz).

So if I understand well, I should purchased the Adjustable BG7TBL version with Square Wave and 75ohm output. Am I right?

 

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@Superdad I was wondering if you have received your BG7TBL clock?

Were you able to measured the phase-noise performance of the OCXO? Do specifications of the DAPU are true (-125dBc/Hz at 10Hz)

 

[yy]

@R1200CL

The phase noise of the external Nadac Clock-L device is -130dbC @ 10Hz. The BG7TBL (based on DAPU spec) is -125dBc @ 10Hz, so it should be still a major improvement. 

 

Unfortunately the Mutec can't match with the Nadac. The DAC doesn't synchronize on 10Mhz clock but only on 692Khz (specific format of Merging). The Adjustable BG7TBL should be able to generate this 692Khz signal on its output, no?

 

 

[yy]

1 hour ago, Superdad said:

 

Where are you coming up with this 692KHz rate for Merging?  The word clock I/O for their DACs (and others) are always to be some multiple of either 44.1KHz or 48.0KHz. 

 

Directly from the technical support of Merging. You can find also this information on their site web.
The Merging +Clock has multiples outputs including one dedicated synchronization for Merging Nadac.
This output signal is 625Khz (my mistake it's not 692Khz). The main benefit of this format is that the NADAC will be synchronised to the external clock while he continues to switch automatically the sampling rate of the file played.
The WordClock format is also possible but it requires to change the format 44.1 or 48kHz which is less practical.

 

 

[yy]

2 hours ago, R1200CL said:

Edit:

Closest you get is 690 KHz (probably doesn’t matter). 
Adjustable Frequency Range/Step: 10K-180MHz/Step 10Hz

Sorry, actually it's not 692Khz but 625Khz.

From 10 000 Hz with step of 10Hz it should be possible to reach 625 000 Hz.

[yy]

16 minutes ago, Superdad said:

 

Merging NADAC has always struck me as a strange beast--put together using the giant, created long ago Ethertube from Horus.  So it seems that the clock going into the NADAC is not going to the DAC at all, rather to that Ethernet card, which ultimately generates (with PLL clock synthesizer) audio rate clocks. (The black coax/BNC cable in the photo below can be seen going directly from the "Word Clock" input BNC to old Horus Ethertube card.)

 

 

There are a lot of NADAC owners enjoying their DAC powered by our choke-filter, dual-output, 5-7.4A JS-2 linear power supply. Given the $15 SMPS they have (hiding under that aluminum shell) it is not hard to understand why. Not what one would expect from a $10K+ DAC... 

 

The internal of the Nadac doesn't reflect it's audio qualities at all. This DAC is a fantastic machine. But it's true that your JS-2 power supply is a great upgrade ;-)