Author Topic: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator  (Read 419 times)

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Offline phlegeton

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Hello,

I try to repair a IQ modulator from a R&S SMIQ02. At a first look at the components, I can't identify some smd parts. Hope their is someone we came across these parts, and can help me out. I can read the markings on the parts: The first part seems to have the marking "RP11G N580-4" the second part is under a metal part, but reads "N4".

If a search on this "N4" part I only can find the 'NBB-400' and this is a MMIC amplifier DC to 8Ghz. Which I'm not sure if this is right. I can't find anything on the  "RP11G N580-4" part.





 

Offline BreakingOhmsLaw

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Re: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator
« Reply #1 on: April 16, 2021, 07:05:23 pm »
« Last Edit: April 16, 2021, 07:10:39 pm by BreakingOhmsLaw »
 

Offline Storm

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Re: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator
« Reply #2 on: April 16, 2021, 08:42:07 pm »
N4 refers to Sirenza/Stanford Microdevices NGA-486.
 

Offline phlegeton

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Re: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator
« Reply #3 on: April 16, 2021, 11:13:39 pm »
Thank you all! With this I can investigate further. I searched high and low. What is the trick to identify these smd parts ?
 


Offline phlegeton

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Re: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator
« Reply #5 on: April 17, 2021, 03:34:26 pm »
ah I see where I got it wrong: I read the first character as "R" not as a "F". Again thanks. Now I now the part numbers it's so much easier to find the right datasheets.
 

Offline zmetzing

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Re: Please help identify smd parts Rohde Schwarz SMIQ02B IQ modulator
« Reply #6 on: June 08, 2021, 02:36:14 am »
Make sure you trace the signal path through those RF switches (white squares marked "4227T") before replacing the active devices. I replaced the amplifiers only to find out that the real problem was a bad switch.

https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-110-output-unleveled-iqmod-alc-failure/msg3189932/#msg3189932
« Last Edit: June 10, 2021, 03:26:35 pm by zmetzing »
 


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