Thank you David. That was not obvious 😊

That’s clear now. I used to protect my receivers with such a trick when I was SWL… many years from now

>The bulbs located close to RF connectors ADC1 and ADC2

I was trying to locate them using the pictures of you blog… I spot the location  on the pcb, on the left side of each SMA.

Tnks again. Be sure I’ll ask further stupid questions, as long as I don’t have the whole picture in my brain.

73’

Marc f6itu