Re: QMX(+) Build experience, Poor Audio Filter Sweep/RF Filter Sweep/Image Sweep/ADC IQ test and resolution with new PCM1804
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A 15% failure rate for any semiconductor device is extremely high. Googling PCM1804 failures shows posts about high-level audio noise that randomly occurs and goes away.
Tony
On Wed, Jan 1, 2025 at 10:26?AM Zrinko Ivan Vukoja via <ivan.9a5czi= [email protected]> wrote: Hi Hans,
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Yes, the problem is very strange.
In my case the PCM1804 worked almost correctly. The fault was only in the unequal amplitude of the I and Q signals. If I had not used the diagnostic tools in the terminal I would not have noticed the problem immediately.
What is common in all cases is that the problem is present from the first power up, and fault never appears later. That is why I suspect a fault in the PCM1804 manufacturing process.
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73 de Zrinko Ivan, 9A7AM
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