Did you run the self-test?
I am sorry for my misinterpretation of the Harm message.? I would still do the self-test.
Looking at your picture again, two points come to mind:
1 - Are there male and female connectors on the attenuator?? The male connector goes to the transmitter, and the female to the test instrument.? The better attenuators are marked.? For some, the direction does not matter.
2 - Be careful when testing the QMX without a case supporting the boards.? I fried one while trying to isolate a control board issue.? That one is now spare parts.
At some point, you might want to purchase a nanoVNA.? If I get a questionable reading, I use my nanoVNA to validate the cables, attenuators, and connectors.
73
Evan
AC9TU
