Hi Klaus,
Sorry to? hear you're having problems with your QCX too. I have been tracing circuits to see if there is possibly something else wrong beside T1. I plan to inject a small signal right into T1 to see where the tank circuit actually resonates, and adjust from there. I should also be able to tell if the inputs to the quadrature sampling detector are actually 180 degrees apart. I figure if I break something it won't matter.
73 from Colorado, USA
Dave, KE?OG
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Dave Casler
KE?OG
Colorado, USA
www.YouTube.com/davidcasler
Dave KE?OG