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Rohde & Schwarz CMU200

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tech255:
The model number ending in .30 is a production line model normally banked in fours and is used to program and calibrate mobile phones as they move along the production line there is something embedded in the software that stops a lot of the options from working believe me i have tried.
After purchasing several scrap units i found one with a hard drive which was a .02 model this one is the best for modifications i now have every conceivable extra added and all of the latest software v5.22 i also have 50w input on channel 1 and +13dbm output from channel 3.
The audio board option B41 does not give you audio from the speaker its not available its for future development which is never going to happen, took me a while to work this out but it is possible to use the rf and audio together to get sinad and distortion readings but you need the Amps boards and software.
If anyone needs the latest software i can send it to you, i dont have a website you can obtain it from Rohde & Schwartz sent it to me after i contacted them about a fault.

Alfons:
The module arrived today. For some time now, the shipping time from China has been significantly reduced. It usually takes about 2 weeks for parts that are a little more expensive. Only small parts take longer.

As described, the part is used, which is also clearly recognizable. But it looks undamaged, attempts of repair are also not visible. AR electronique, the manufacturer of the OCXO, is a French company, that specializes in the manufacture of quartz resonators, oscillators and piezoelectric filters. At least that sounds trustworthy.

If I have installed it, I will report. Next week I have a GPSDO here for a few days, so I can also check and adjust the frequency.

Alfons:
Well, the installation was done in five minutes. The device recognized the module as B12 during booting, no further steps were necessary.

It seems to work. After a quarter of an hour warm-up, the signal shows an improvement. I still have to see, if I have comparison images, but the phase noise is obviously lower. Before that, I had a crater-shaped collar at the top of the bell. This has disappeared and the phase noise has decreased by about 7-10dBm (but only from my memory). I am really amazed to see that. In addition, the frequency display is now more accurate and the selective power meter shows the frequency in the last places much more quietly and precisely. So, it looks like the purchase was really worth it.

Edit: Since I was a little too quick, here is a Correction: the measurement accuracy has actually improved, but the phase noise is at best 3 dBm better, not 10 dBm. But I have to check it more closely. At least I can say that the module works well.

heavenway:
Hi everybody!

new to this forum and really apriciate so much enthusiasm and competence, was wondering if some of you use the CMU200 in ham radio lab or for receivers/transmitters troubleshooting and align: will be glad for some advices in the case.

I am in the willing to buy one but... the only (and not small) limit it has is the spectrum scope that starts at 10mhz, and its a big limit for me.

cheers

Ringmodulator:
Hi,

there is a solution for this:

Look on Ebay for CMU200 10MHz Spectrum Analyzer Expansion for Radio Communications Test.

It is just a simple mixer. Works for me.

Chris

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