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Rohde & Schwarz CMU200

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_Wim_:
The manual you need is 1100.4903.12-04, but I cannot find a direct link online and it to big (16Mb) to attach here. If you sent me a pm with your email address, I will sent it to you.

_Wim_:
Has anybody found some reference about the max DC input voltage the CMU200 can handle. The only thing I have found about this is this thread: (https://www.eevblog.com/forum/testgear/crtu-ru-input-coupling/), but so far I have not been able to confirm this is correct and applicable to the CMU200 also.

msraya:
Hello everyone!

I get the equipment and I test it.. Hopefully the unit is working well except for some uncalibrated power measures.
The RF generator and RF spectrum analyzer is nice, the DANL is not bad and outperforms my RIGOL by a little..

The main problem with the unit is that it cannot make Audio analysis and RF analysis at the same time.. so I cannot adjust FM equipment with the RF generator and SINAD meter, nor I can use an external demodulator over the IF output and at the same time do deviation measures with the Audio analyzer..  |O

I think I will need the AMPS extensions K29  :palm:  and that must be purchased separately.. so only RF generator, selective Power meter, frequency counter, Spectrum analyzer, Audio Generator and SINAD meter for me is enough..

So if someone can get both measures working at the same time, please give me advice..  :scared:  ..
No audio test in GSM is not working for me  :rant:

For _Wim_, basically no one RF Spectrum Analyzer accept DC voltage in input.. Remember that is has a 50ohm resistor in input, so more that aprox 5VDC burn the resistor... So if the equipment does not have DC block capacitor, as is the norm, you will have to supply one.

For ZL1CVD, yes all manuals are online.. so no problem to find how it works..

R&S have Windows programs in their web page to use the unit as tracking analyzer, and to make some GSM, WLAN, etc.. complicated measures.. (power, occuped bandwidth, etc).. You need serial cable o GPIB card and cable..

Regards
Manuel

ZL1CVD:
That is good you have CMU200 now msraya

Mine has K29 which is just software. K29 need hardware CMU-B54 v14 which I have. I will see if i can figure out simultaneous RF & audio analysis.

I now have all manuals - user manual was not on R&S website nor could I locate it through google.

For windows software I am not looking to use GPIB. I would like to talk directly to the DLLs - for me Delphi or Lazarus would be the go as I'm not good with c. I suspect this may be beyond my abilities so may have to fall back to serial GPIB.

I'm in the processes of ordering a R&S CRTU-RU. It has windows loaded and looks loaded with RF cards. It certainly has the connectors for the I/Q output so I suspect (hope) CMU-B17 analog I/Q is fitted. This should allow me to play around with a an external Teensy SDR SSB/AM/CW modulator / demodulator. 

When _Wim_ asked about DC voltage I also thought ohms law which would mean on 2W input @ 50 ohms a max of 10V - unless of coarse there is a blocking cap which I'd have thought would adversely effect the frequency response?

Cheers for now!

hoangviet:
Hi everybody

I just bought 3 dead CMU200 from a mobile company. They both had faulty PSUs but i manage to repair 2 of them which had issue with standby PSU, only faulty TOP200YN converter IC  :D

One unit had a Non-volatile Ram Empty error with Model CMU XXX and no Serial, work with only basic function, my guess would be the PSU fail at the time they update the firmware. In version manager i do see a choice to copy NVRAM to disk, but couldnt find the other way back  :-\

The other unit work ok with all software option at start, but after few days the start-up process stuck at BaseDiscoverOptionsEnd with the Link LED in Digital Board blink sometime, i had trace the problem to the Digital Board by exchange with other unit but dont have any info to debug it. Anybody have the same error like this one ?

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