Products > Test Equipment
Teardown, Repair & Analysis of a Rohde & Schwarz FSH3 3.0GHz Spectrum Analyzer
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hgl:
In 2018, I looked into the R&S TSMU and also saw the excellent FSH3 teardown video.
A German dealer had gotten a whole pallet of them from a bankruptcy and offered them for about 25€ on Ebay.  I then bought 2 and started a thread in German microcontroller forum.

https://www.mikrocontroller.net/topic/454625

The RF boards of TSMU and FSH3 look the same but the assembly is different.
The rest of the construction is completely different.


tonyM:

--- Quote from: dianzimi on August 12, 2022, 04:19:51 pm ---I have a fsh3 ,it is not work and missing  some resistence  and  capacity  ,show the picture,can you tell three resistence  and one capacity  value   ???thank you
I can not load the picture ,can you tell the email??my email is dian.zi.mi@163.com

--- End quote ---
First, help us identify PCB version of your FSH3.

My TSMU has older PCB, slightly different from FSH3. It has:
- missing Downconversion section for frequencies above 3GHz on the back side of the PCB
- missing Attenuator at the input signal path
- slightly different input signal section
- different model of 10MHz-TCXO


Newer TSMU PCB is the same as FSH3 PCB. It has:
- Downconversion section for frequencies above 3GHz on the back side of the PCB, but without components (populated in FSH6)
- missing Attenuator at the input signal path



FSH3 PCB is the same as newer TSMU PCB. It has:
- Downconversion section for frequencies above 3GHz on the back side of the PCB, but without components (populated in FSH6)
- Attenuator at the input signal path



All above PCB versions have the same Tracking generator part on the front side of the PCB, where the missing parts have to be placed:


Please check and identify your PCB.
And also provide the numbers on the front and on the back side of your PCB, marked by the blue rectangles in the above TSMU-ver.2 pictures.

Where are the missing parts on your PCB? At the input signal section (marked in the above pictures as "Pad")?
pdenisowski:

--- Quote from: Wuerstchenhund on August 04, 2015, 07:11:51 pm ---The FSH3, which btw was the first generation of handheld SAs from R&S.

--- End quote ---

The FSH3/6 series was a very popular product: one even made a trip to the International Space Station (although it did have to be slightly modified - see link to article)

https://www.rohde-schwarz.com/file/n184_fsh3.pdf


--- Quote from: Wuerstchenhund on August 04, 2015, 07:11:51 pm ---The FSH Series is still made, however from what I know the hardware for the old FSH3 and the newer FSH4 and above is different

--- End quote ---

Yes, that's correct.  In addition to the FSH4/8/16/20 we also currently manufacture an even newer (!) portable spectrum analyzer, the FPH.
dianzimi:
I want  to  know  Attenuator component   value  at the input signal path
tonyM:

--- Quote from: dianzimi on August 16, 2022, 01:56:48 am ---I want  to  know  Attenuator component   value  at the input signal path

--- End quote ---
Do you mean the components in the red rectangle bellow?
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