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Rohde & Schwarz CMU200

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Alfons:

--- Quote from: markus_jlrb on December 12, 2019, 03:54:16 pm ---@Alfons,

check out in addition the link in the german MC forum too in order
to find usefull infos concerning the CMU200.

https://www.mikrocontroller.net/forum/all?filter=CMU200*&x=0&y=0

Markus

--- End quote ---

Of course, I have already read everything there about the device. :) And since I was waiting for the device, i already read everything worth about the device here on EEVblog and in the MC-forum So I was able to serve the device relatively quickly. I have just tried FreRes: really great, very useful.

What I've noticed is that you really need to have reasonable cables and connectors for the instrument to deliver accurate results. I'm not fortunate enough to have a few very high quality cables shipped from China some time ago. With my old cable, I could not perform the self-test error-free. Yes, I am new to RF.

Alfons:
Had posted the question elsewhere, but I'll ask here:

In my MCU200 (1100.0008.30) the option cmu-U99 RF1 = RF2 limits the output power of RF1 to 2W. There is no second signal board installed, which usually sits where the heat sink is installed on the front end. The frontend in my Device is the "thick-one" with heat sink and fan. So there must be another reason why U99 is active and the RF1 / RF2 is limited to 2W. I do not think you can disable the cmu-U99 option. Or is that possible?
The 2Watt are also OK, you just have to be more careful with what you connect.

markus_jlrb:
Alfons,

what you are looking for for high RF-Power output is showed on the top left position
of the picture linked below.

https://www.ebay.de/itm/Rohde-und-Schwarz-R-S-CMU200-Universal-Radio-Communication-Tester-Bastelpaket/174039616839?epid=1627651710&hash=item288591cd47:g:LXkAAOSw81Bdh3TT

You have to look for a corresponding spare PA module at Ebay.

Sorry to say.

Markus



Alfons:

--- Quote from: markus_jlrb on December 13, 2019, 12:44:15 pm ---Alfons,

what you are looking for for high RF-Power output is showed on the top left position
of the picture linked below.

https://www.ebay.de/itm/Rohde-und-Schwarz-R-S-CMU200-Universal-Radio-Communication-Tester-Bastelpaket/174039616839?epid=1627651710&hash=item288591cd47:g:LXkAAOSw81Bdh3TT

You have to look for a corresponding spare PA module at Ebay.

Sorry to say.

Markus

--- End quote ---

I don't understand you: Why should I need a spare part? The front end works and it is the same as the one shown (at least externally identical). It is limited to 2W by the firmware, not by the hardware. At least I think so.  I think that another 50W frontend would not change anything.

And 33dBm should be enough for almost everything.

Alfons:
Here is a graph from Freres, -30dBm between 100MHz to 2.7GHz. Is this ok? Measured with a 1m coax with adapter N-BNC between RF1 and RF3-Out. With better cables, you can certainly get a little more out and you have to rely on the fact, that the values ​​are correct. I can not compare, because I have no other measuring devices that can RF. As the level increases, the frequency response deteriorates by up to 1dBm, but is still within 2.5dBm. Between 100Mhz and 1Ghz the frequency response is straight.

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