Teardown time
pic.twitter.com/vUzXOy4d8x
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The actual attenuator - it looks like a ceramic PCB with printed resistors, plated ends to make contact with the spring-pins, and pressed into this tube to hold it in place.pic.twitter.com/0CwwuLzwxI
The damage on the end wasn't me :) I doubt it happened during assembly, so maybe someone else has opened this up before. I'm not sure if the blackening at the contact point is normal tarnishing, or evidence of too much power going through this part at some point...
I managed to carefully press the PCB out of its housing. Now we can see what's going on properly! It looks like a Pi-attenuator, with a neat grid structure to allow for trimming resistor values after construction.pic.twitter.com/T2sf6G5D4w
and.. there's the problem - some of the traces are completely blown out. Someone put way too much power into this at some point
pic.twitter.com/2bdoIlBPEV
This is meant for the HP power sensors. They are pretty clear about never putting more than 0dbm into it. It would be cool to see what the internal config is.
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