Author Topic: Anritsu MS2721B / other non YIG spectrum analyzer block diagram or docs / parts  (Read 840 times)

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Offline EE-diggerTopic starter

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My MS2721B with LO error will be arriving shortly  :clap:   It seems that schematic or even block diagram for many Anritsu products may be unobtanium.

Has anyone ever found any documentation for this family or, a block diagram for a non-YIG based spectrum analyzer.  After watching the videos from Shahriar and others, I suspect that this unit does not have a YIG / YTO.  Some failures of the crappy Micronetics VCOs have been found.  These things look like an SMD design with 1960's TV set point to point wiring and a bucket of solder.

I'd like to get a better understanding of how the 3 (or more) VCOs interact in their various RF source and conversion roles.

I've heard excellent things about Anritsu support but doubt that they sell component level items.  Any comment?
 

Offline dj9ss

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Hi,
I acquired a MS2721B which also showed the notorious VCO1 lock error.
According to Shariar's video, I had a closer look on the Micronetics VCOs.
Attached is a microscope picture of a large crack in a soldering joint inside one of thos VCOs.
After resoldering, the unit works fine, and the lock error is gone.
Regards, Jürgen1475881-0
 


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