Hunt for RFI offenders

[mansr]

47 minutes ago, Ralf11 said:

What we really need is a way to examine noise inside the cases of our gear, or - better - inside the circuits.

I had an old computer that was so noisy inside that ATA drives wouldn't work at the top speed, not even with a fancy shielded 80-wire cable. SATA, which was new at the time, worked perfectly.

[mansr]

5 minutes ago, One and a half said:

If that energy is picked up by the radio

Remember that a radio is specifically designed to pick up these signals. A device designed to not pick them up ought to be influenced to a lesser degree.

[mansr]

3 hours ago, Em2016 said:

WiFi and bluetooth?

Those usually use either external antennas or foil antennas behind a plastic patch in the case.

 

BTW, I recently took apart a Marantz AVR. There were copper clips, copper foil, and copper-plated screws aplenty ensuring good connection between all chassis parts.

[mansr]

13 minutes ago, Em2016 said:

Yup, in this case the housing is designed to be "permeable"

But only in one small spot.

[mansr]

5 hours ago, sandyk said:

What is exported from the USB Port to the DAC is an ANALOGUE  representation of the digital data

In a USB signal, a voltage transition during a bit interval signifies a zero, lack of transition signifies a one (NRZI code). There either is or isn't a transition. Very binary.

[mansr]

13 minutes ago, sandyk said:

it's about time you guys stopped portraying so many C.A. members as either gullible or stupid !

As soon as they stop being those things.

[mansr]

1 hour ago, Spacehound said:

"Any degradation of the digital waveform will have consequences, and when that waveform is degraded, there is no way to restore it properly. Once the fine detail is lost, it is lost forever. - C.H."

 

That's bollox.

When people like Charles Hansen and John Swenson, who really should know better, say such things, I have to suspect they do it because they know it sells. And then they get worshipped like some kind of messiah. Disgusting.

[mansr]

5 minutes ago, Spacehound said:

He's not the only one. There's lots of garbage comes  from  'respected' DAC and associated stuff  manufacturers.

 

Most of 'em just buy Sabre DAC chips for a few dollars each, implement what's on the free Sabre data sheet, add 200-20,000 dollars, there ya go, you is a 'respected'  expert and the more you charge the more 'respected' you are.

Respect is earned. The bigger the earnings, the greater the respect.

[mansr]

5 hours ago, sandyk said:

One thing we can't accuse you of being, is MODEST !