Hi Paul, I initially built the 9V version of the QMX.?All my power sources are either 13.8V or 12.8V. My thoughts were building the 9V version with a voltage regulator inline of a dedicated power cord. ?My only concern, and honestly I'm not knowledgeable to know, but I was thinking that the extra voltage would be dissipated in heat, and the hotter the regulator would get, the more amperage it would draw. I was going to inquire about this theory, but then actually getting any output at all out of the rig became the major concern. In the middle of all that, I rebuilt it to the 12V arrangement. Right now I'm not sure why I'm not getting any output so like I said, I will reassemble the rig and run the test that Ludwig was suggesting and go from there. Thank you for your input. After I tackle the output problem, I'll check into your suggestion. I'll try to find some information on which is better, boosting up to 9V, or regulating down from 12V.?
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James
KA9TII??
James