Products > Test Equipment
Rohde & Schwarz CMU200
oh2ftu:
I did some tests last evening, mostly read through the Motorola professional series global tuner and tried out most of the alignment procedures.
In short, it's a PITA.
I recall seeing the power meter in AMPS showing power in watts, I'll have to figure this out (or just use a conversion).
Inserting rf input frequencies under amps really sucks. They must be input as Hz OR decimal MHz + offset in Hz.
If there's any chance in modifying the offset to 25kHz instead of 30kHz it would be superb.
On rx testing (AMPS RF gen) there's no option to enter discrete frequency - it has to be done with decimal MHz + offset in Hz.
I am opting to use both devices to get around the AMPS frequency input restrictions.
There are a dozen frequencies that need to be inputted in both RX and TX tests - for ~20 devices. So I will have to streamline it "a bit".
A note about the powermeter/frequency counter in normal power meter mode: The analyzer frequency and RBW must coincide with the signal for it to work.
I'm going to crossreference my devices when I get the GSPDO running; one has B11 and the other B12 so I hope they would be near each other.
msraya:
Thank You!
I suppose that K29 not worth it. Only important for me is to adjust deviation on FM transmiter..
K29 have this measurement?
Another option is use a demodulator with a MC3361 and calibrate it in mV RMS with another modulation meter...
Manuel
oh2ftu:
--- Quote from: msraya on October 26, 2016, 09:18:14 am ---I suppose that K29 not worth it. Only important for me is to adjust deviation on FM transmiter..
K29 have this measurement?
--- End quote ---
K29 does show deviation; It is able to inject af signal at given freq to the DUT and analyze the received RF signal (power, deviation, freq error etc)
msraya:
Interesting...
Now, only I have to find how to activate this option :-DD
Manuel
danielg:
--- Quote from: msraya on October 24, 2016, 02:15:47 pm ---Danielg:
The generator and power meter both work at the same time in the MSDOS native app.
It is a basic functionality of the equipment, so you not need any special option for it to work.
The program FreRes will use both generator and power meter as same CMU200 unit at the same gpib address..
Manuel
--- End quote ---
Hi
Little update, I have been searching for way to tune duplex filters by using CMU200. CMU200 is not offering or not licensed to sweep frequency’s so I have been searching for how to get the RF curve of filter. Last week I got Agilent 82357B that is USB to GPIB converter to connect my CMU200 to FreRes software. The short story is that worked very well and I want to say thank you for your help. I will attach pictures to give you and others an idea how gui looks.
Pic1 shows Rf cable looped from Generator to Analyzer
Pic2 shows duplexer. Red line is Duplexer Low input to antenna and black is Duplexer High input to antenna. Duplexer are for 158,1 and 162,7 Mhz.
Pic3 shows blue line as reference of -10 dBm output power from CMU200 in all tests. Black and Red lines are the same as in pic2
This test is done in three parts. FreRes allows you to seep multiple (this case three times) and draw pictures in different colors to compare.
I was wondering if anyone knows or have tested how to measure Reverse power and Forward power by using CMU200.
I’m trying to measure SWR of power going to duplex filter and back to CMU as part of figuring out if duplex tuning is ok.
At the moment I only know how to see power from generator and read it in analyser and I don't know if Reverse power measurement is possible - I the answere out there? :)
Thanks
Daniel
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