John Swenson tutoring paper: "Considerations regarding usage of external reference clocks" (EtherREGEN and other): Sine vs. square, impedance, cables—and a money saving surprise at the end.

[DSK6]

So have those of us who waited a while for the paper from John/Alex but then figured their workload wasn't going to allow them to release it any time soon and went ahead and ordered the After Dark Queen 75ohm Square Wave "special for EtherREGEN" clock not got the best model for the money what we thought we were getting? 

 

Though nothing was stated explicitly anywhere, I must admit that due to the relationship between After Dark and Uptone and the fact that this model clock is advertised as the "special for EtherREGEN" model, I assumed that there had been at least some collaboration or discussion and that the square wave option was what Uptone and AfterDark were recommending for the EtherREGEN. 

 

My AfterDark clock & PSU arrived in Australia last week, as did my Apogee Wyde-eye 75ohm BNC cable, and my EtherREGEN arrives tomorrow. Should we have bought a sine wave model OCXO clock and a filter instead? Or is the AfterDark Queen square wave output one of the ones that is done really well and (with good enough BNC cable) can match the sine wave output with filter at EtherREGEN?

 

I'm guessing I'm not alone in this situation or state of confusion.

 

Any feedback from AfterDark and Uptone would be appreciated as I'm not going to have a sine wave clock and filter to compare to.

 

 

[DSK6]

1 hour ago, AfterDark. said:

... The Giesemann Clock - Queen Square Wave Special Edition is special made by OCXO manufacture natively (OCXO module that has a built-in squarer circuit). So, there is no extra convertor outside the OCXO. This approach can make sure the OCXO can generate the best square wave for EtherREGEN.

 

We are planning to have "Trade-In"program for customer who wants to upgrade from Square Wave to Sine Wave Edition with the Mini - Circuit BLP -10.7+75 (75ohm version) . We want to make sure during the transition period after reading the white paper, we should provide more flexible option for audiophilestyle.com group buy. 

 

The sine wave version is better quality OCXO in terms of Phase Noise and Allan Derivation on measurement. With the helps of the Mini - Circuit BLP -10.7+75 (75ohm version), it will enhance the performance much further in sounding according to the white paper. ...

 

 

Thanks Adrian and also Leo Sound. It is good to know that the squarer circuit is built in to the OCXO rather than being done off chip. Hopefully the OCXO module used is one of the "couple of chips that do this extremely well" as per Alex's earlier post. 

 

Adrian, were your last 2 paragraphs that I quoted above comparing your sine wave versions to your Queen Square Wave SE version, or to the cheaper BG7TBL square wave clocks?