I have seen several 8563E, 8561E spectrum analyzers with about 500KHz spurious at a level of -50dbc.
I believe the spurious is generated at the Fractional N Synthesizer at the A14 Frequency Control Assembly.
Has someone noticed this and found a cure for it?
Is there a simple way to reduce this spurious level? Replace the The Fractional N divider?
I have the schematics for this Assembly and I am willing to share it with someone that can help.
Problem traced to a faliure in the power supply regulator assembly p/n 08564-60009.
I have replaced the regulator assembly and the spurious disappeared .
I will troubleshoot the regulator assembly and will advise about the required repair.