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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> I understood that; you are handling it before >? it hits customers for everything except the? > QMX, however even you having to deal with > a 15% failure rate on a component is nuts > (for you to have to deal with).
Nuts, yes! Welcome to my life.? QMX is the outstanding problem. We will find a solution to that too.?
The QMX boards could be tested with some sort of bed of nails test fixture that provided the appropriate test signals for IC403 couldn't they? Use the CLK2 signal attenuated by R513 with a suitable level and phase shift, then the Rx Audio and Image tests should work.? That's enough to test most of the Rx side on an unpopulated board.
Yeah like my QCX-mini test fixture:
It took me 3 R&D-Weeks to build that. I shudder to think how many actual elapsed weeks it would take me to do that now. Arrrgghhhh. But yes it's an option I'm considering... The complexity and number of test pins could be greatly reduced if looking for one specific fault rather than trying to test every aspect of the entire radio.?
I guess you don't see the PCM1804s until they arrive on boards.? Has your trusted supplier been caught by someone flogging clone ICs?
Nope. That would be too easy... Anyway I have never seen anything other than absolute loyalty in the last 11 years working with my colleague in Shenzhen and I'm sure he would never cheat me. He knows what side his bread is buttered on. Issues further along the supply chain (in other words him being cheated, or suppliers of his suppliers) are harder to be so sure of. A messed up world.?
73 Hans G0UPL 73 Hans G0UPL
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