[AudioAlex]

Check this:

As I understand it is both the termination and the resistor behind it that define the impedance.. The most reliable way to verify is to actually measure the impedance of the termination..

 

[Dandoudou]

Check this:

I received the OCK-1. Unlike on your picture, its 75 and 50 ohms female outputs are all the same.
What does it mean?

 

[Dandoudou]

As I understand it is both the termination and the resistor behind it that define the impedance.. The most reliable way to verify is to actually measure the impedance of the termination..

I received the OCK-1 today. Unlike on your picture, its female 75 and 50 ohms outputs are all the same.
What does it mean?

 

[bodiebill2]

I received the OCK-1 today. Unlike on your picture, its female 75 and 50 ohms inputs are all the same.
What does it mean?

You mean outputs? Not sure. Maybe ask Alvin? I am not very technical but I had something similar when Magna Hifi converted the WCKL output on my DI-20HE to 75 Ohm. They said they did it internally, so I guess they changed a resistor. However the visible connector was still the original 50 Ohm one just like your 3 clock outputs. It again confirms that this is underdocumented territory :-|

Maybe someone has instructions how to DIY measure the impedance?

 

[gimmeheadroom]

75 ohm clock cables work ok with 50 ohm connectors. But it seems dumb to do that on purpose. They should have changed to the correct connectors.

 

[Dandoudou]

You mean outputs? Not sure. Maybe ask Alvin? I am not very technical but I had something similar when Magna Hifi converted the WCKL output on my DI-20HE to 75 Ohm. They said they did it internally, so I guess they changed a resistor. However the visible connector was still the original 50 Ohm one just like your 3 clock outputs. It again confirms that this is underdocumented territory :-|

Maybe someone has instructions how to DIY measure the impedance?

I sent a mail to Alvin, asking why the customized 50 ohm output has the same connector as the 75 ohm outputs.

 

[gimmeheadroom]

I sent a mail to Alvin, asking why the customized 50 ohm output has the same connector as the 75 ohm outputs.

Because the connectors were 0,5 euros for 3 pieces on Aliexpress?

 

[Getafix]

It means they are not very precise in what they do. I also believe they are not precise in measuring the phase noise of their products.

And the impedance of a clocking circuit is more complex than putting in a 50 or 75 ohm resistor.

 

[AudioAlex]

Maybe someone has instructions how to DIY measure the impedance?

Just google: how to measure resistance using a multimeter.. there is plenty of instructions online..

 

[AudioAlex]

They said they did it internally, so I guess they changed a resistor. However the visible connector was still the original 50 Ohm one just like your 3 clock outputs.

I believe it is common practice amongst EC manufacturers.. Mine (Morion) is adjusted the same way: I have 3 identical terminations, but one of them is 75 Ohm (different resistor).

 

[bodiebill2]

Just google: how to measure resistance using a multimeter.. there is plenty of instructions online..

Thought about that of course but as we are talking about clock connectors and cables, some guidance on what to measure (from where to where, connectors internally, cable, whole chain?) would be welcome.

 

[Igor375375]

75 ohm clock cables work ok with 50 ohm connectors. But it seems dumb to do that on purpose. They should have changed to the correct connectors.

It turns out it's not that simple. Here's a quote from the R-27HE manual:
" "2 - BNC", for the BNC coaxial digital input; (If update the EC firmware, the 2-BNC is for the external clock input .The external clock output impedance must be 75 ohms, the supported output level range is 0.7-3.0V and a 50-ohm BNC cable must be used.)"
p.s. I wrote to Kingwa, here's his reply:
" Dear Sir,
The R27HE default with 75 ohm socket for the clock input .
If your clock is 50 ohm, you can custom order the R27HE with 50 ohm socket .
The DI20HE default with 50 ohm socket so don't need custom order .
Kingwa "

 

[Mr Brett]

Received the LHY OCK-1 today.
Set everything up.
I let Qobuz lapse. Just corrected that.

Is playing now. How long of a burn in is suggested?

 

[Mr Brett]

The Gustard C2 will be a while. Sent it to my brother in Australia.
So using a 75ohm Black Cat Silverstar in the interim.

At some stage will A/B with the OCK-1 and the DI-20HE internal clock.

 

[gimmeheadroom]

It turns out it's not that simple. Here's a quote from the R-27HE manual:
" "2 - BNC", for the BNC coaxial digital input; (If update the EC firmware, the 2-BNC is for the external clock input .The external clock output impedance must be 75 ohms, the supported output level range is 0.7-3.0V and a 50-ohm BNC cable must be used.)"
p.s. I wrote to Kingwa, here's his reply:
" Dear Sir,
The R27HE default with 75 ohm socket for the clock input .
If your clock is 50 ohm, you can custom order the R27HE with 50 ohm socket .
The DI20HE default with 50 ohm socket so don't need custom order .
Kingwa "

Hard to understand what this means. And anyway, mixing and matching clock connectors is certainly not standard.