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In Reply to: RE: strangest problem with dac posted by cb1 on September 06, 2015 at 18:30:11
Change the coaxial cable.
Substitute it with a cheap video cable first.
The type that you get supplied with with a cheapo DVD player.
Confirm that the interface is stable and move on to trying other 75ohms terminated coaxial cable.
Follow Ups:
I am using a usb to coax adapter from my pc. I'll have to try coax from my dvd player to see if problem occurs there.
Your DAC interface receiver is momentarily losing lock - best interface jitter tolerance is obtained with a long time constant which means you can lose data with burst interruptions.
If you are able to run an optical link between your PC and the DAC, then you can determine if the issue is conducted or radiated EMI. An optical link will eliminate the electrical interaction between DAC and PC.
Impedance mismatch would result in increased interface jitter which may increase the likelihood of the DAC losing Lock, but since you say that the dropouts only occur when you switch a dimmer, this would suggest a vulnerability to EMI. Most likely this is through the power supply. This may either be coupled through from your PC which may corrupt the transmitted data through the USB adapter, or through the DAC power supply (or both!).
Do you know if the USB adapter is galvanically isolated (i.e transformer coupled)?
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
I have found that the problem only occurs with my usb/coax adaptor. Problem complete disappears with straight coax from my dvd player.
Which suggests noise injection via the PC. I assume the USB interface is bus-powered - the PC power supply is usually very noisy.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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