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Re: QMX(+) Build experience, Poor Audio Filter Sweep/RF Filter Sweep/Image Sweep/ADC IQ test and resolution with new PCM1804

 

Repeat and expanded, explained tests:
Point? ? ?Result
BNC? ? ? ? ?good
IC408
? Pin 5? ? ? ?good
? ? ? ? ?1? ? ? ?good
? ? ? ? ? 2? ? ? good
? ? ? ? ? 3? ? ? good
? ? ? ? ? 4? ? ? good
? ? ? ? ? 6? ? ? ? no
? ? ? ? ? 7? ? ? ? no
? ? ? ? ? 8? ? ? very weak
IC402
? Pin? ?9? ? ? very weak
? ? ? ? ? ?10? ? weak
? ? ? ? ? ? 11? ?noise
? ? ? ? ? ? 12? ? ?no
? ? ? ? ? ? 13? ? ?no
IC403
? Pin 7? ? ? ? ? ? ~55 mhz*
? ? ? ? ?9? ? ? ? ? ? ~55 mhz*
* very strong signal - twice rms of input (see picture)
?
?
?
73
Karl
KI4ZUQ
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