Quote:
Originally Posted by G0HZU_JMR
The crystal RBW circuits in the HP 8566/8 are very similar to your third image, except a BJT is used in place of the phase inverting transformer. The compensation trimmer should help with filter symmetry, and I think that section is what needs tweaking in some places in my HP 8568B. The cal procedure is quite detailed and lengthy. I've got the gear here to do it all, but it might take me a long time...
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I have found the HP8566 crystal RBW schematic attached. It is like a maze inside, an enigma machine.
I need to man up and go outside in spite of the cold now. Enjoy your cal.