Products > Test Equipment
Rohde & Schwarz CMU200
w7owc:
I am considering buying this option for my CMU. Is there a practical way to mount this board inside the CMU200. Also how has the newer shielded board worked out? I want this to sweep different cavity filters 30-1000 MHz?
Brainbox:
For me the option works well enough, I have the unshielded first version.
I don't bother about an exact calibrated output because I use it mainly for trimming filters.
Precise levels are not that important.
You can build the option inside the cabinet, I did consider that also.
There is a free 64 pole DIN connector on the main board inside where some supply voltages are available.
Mount the the option board on a adjacent adapter and plug it in the main board.
You can leave the LO cable from the RxTx board inside the cabinet en use 2 SMA > BNC cables to the backpanel to make the 1816.115 MHz and the Input available.
oh2ftu:
--- Quote from: msraya on May 18, 2016, 11:02:13 am ---
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: ..
--- End quote ---
I recently purchased (finally) my own CMU200. It's with FMR6, but PS/2 connectivity in the back.
The hardware options are B12, B21v14, B41, B52v14 and B54v14. Software options include K21-K24, K42, K43 and K45. Firmware version v5.1, v5.22 seems to be most recent.
My plan is to use this to tune radio equipment, but it seems I cannot analyze the audio that comes with the rf signal, is this true? Would the option K29 enable this?
I am able to modulate an audiosignal into the RF output, but cannot analyze it. Drat.
It still seems to be a lot to learn.
danielg:
--- Quote from: msraya on May 30, 2016, 08:51:12 am ---
The free software FreRes from Rohde & Schwarz allows to make sweep and test for example filters or duplexers.
Manuel
--- End quote ---
Hi
I have an easy question regarding CMU200 and that is what is the best way to connect GPBI to Win7. I have access to serial port and parallel port (LPT) ?
Can I connect via LPT port or do I need some converter ?
I want to be able to connect FreRes because I hope I can use it to tune some duplexer.
Thanks for alot of useful information :)
msraya:
Hello!!
--- Quote ---I want to be able to connect FreRes because I hope I can use it to tune some duplexer.
--- End quote ---
The LPT port is for printing only. And to transfer files in old MSDOS software.
The serial port works, but You must change secondary addressing for work with RF generator and audio analyzer at the fly. It is made by prefix the command with "1;" You can view it here: https://www.eevblog.com/forum/testgear/rohde-schwarz-crtu-gpib-control/
The CMU200 uses secondary GPIB addressing, so it behaves as three equipment at three GPIB addresses. One for system configuration, other for RF generator and other for Audio analyzer.. you can change it in the setup section.
So the easy connection is by GPIB with multiple addressing to configure. I use an Agilent GPIB to USB converter. I think freeres does not work with serial connection, but I don't know.
--- Quote ---My plan is to use this to tune radio equipment, but it seems I cannot analyze the audio that comes with the rf signal, is this true? Would the option K29 enable this?
--- End quote ---
Yes, I think so.. But I cannot test K29 option. The receiver is SDR I/Q and in theory it has enough power by using a FPGA, so it would demodulate anything if you have the proper software. But it is more easy to use a external demodulator connected to the FI output. I use a Yaesu FT-817 with very good sensibility.
Manuel
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