Electronics > Repair
Rohde & Schwarz SMIQ03B with Error 110 Output unleveled; IQMOD: ALC failure
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jgorsk:
I also have a faulty SMIQ with the 110 error (Output unleveled; IQMOD: ALC failure) but the output stage amplifier seems to be working.
I suspect some filters between the frequency divider and tha output amplifier stage.

Attached are the spectra of the -10dB signal at 450MHz and 460MHz. The amount of harmonic tones at 460Mhz (and above) is way higher
than specified in the SMIQ documentation.

Could someone do me a favour and post the spectra of their SMIQ generator at -10dB and 450 and 460MHz please?
I'd like  to see how those signals look like on a working generator.

rastro:
Hello jgorsk,

Which model of SMIQ do have (3,4,6??).  It will probably make a difference.  The 4/6 go through an additional PCB.

-rastro
jgorsk:
It's the SMIQ 02 model
rastro:
I've included the spectra for an SMIQ06 set to 450MHz and 460Mhz.  I don't know if this will help since it has additional RF paths.
- rastro
jgorsk:
Thank you very much, that's what I needed to see.
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