Products > Test Equipment
Rohde & Schwarz CMU200
cio74:
They look interesting, just not a lot of them available at the moment or I don't now where to look for them?
Astrodev:
I know what you mean about 5 months ago there were quite a few around, if a bit pricey but they seem to have disappeared, it was just before this that I got my CMU200 and then when I got the chance of a number of CRTU's about a month latter I managed to get hold of 4 of these from an R&D lab that was closing down. But now even the CRTU's seem to be getting scarce.
As far as I understand there was a large number of CMU200's and CRTU's coming out of quite a few of the mobile phone manufacturers as they were not capable of handling the newer standards above 3G and so were no longer required, but I have also seen a large number of the CMW500's coming through which are still a current product as well as a lot of LTE gear from the likes of Anritsu.
So who knows what may start filtering through over the next year as the requirements evolve, it may well allow access to the sort of gear most of us could only dream of in the past at a price level the amateur can afford.
msraya:
Hello All!!
I installed Windows 2000 on the unit, what a deception!!... It is so slow... I think it will not servers any purpose...
My LinkSys CF wifi 802.11b with CF adaptor doesn't work, I test 3 or 4 different drivers with no luck..
So no Windows2000 for me.. :scared:
However the DOS software v5.10 works well in my new Hard Disk: 8GB CF Card with adaptor. :-+
So... I measure the phase noise performance of the set with my 10 MHz Rubidium Frequency Standard, a EFRATOM LPRO-101 Unit that is very nice, and has low phase noise. I also build a simple ADE-1 Mixer to test if the unit can do Spectrum analysis from 0 MHz, with the internal generator and 1Ghz OL, and it work, of course... Although the ADE-1 is for no more than 500MHz, it works at 1GHz... outside of specs.. :-//
I put 7dBm @ 1GHz from the RF2 OUTPUT into the OL input of the mixer, a 30dB pad from the +10dBm EFRATOM source to the input IF of the mixer. And in the output (RF) of the mixer I connect directly to the CMU200 input. The spectrum is clean.
The trending on phase noise in my lab, from the poorer to the better:
RIGOL DSA-815 TG: At 1Khz -56dBc @ 100Hz BW (What a dissaster!! :palm:)
TEKTRONIX 492BP: At 1Khz -69.6dBc @ 100Hz BW
RHODE & SCHWARZ At 1Khz With Mixer AD-1: -72.5dBc @ 100Hz BW
STABILOCK 4032: At 1Khz -76.2dBc @ 100Hz BW
RHODE & SCHWARZ At 1Khz -76.6dBc @ 100Hz BW
Manuel
ZL1CVD:
Well Win2K on the CRTU works OK - not too slow. Would be better with SSD. But as others already mentioned, it does not play well when DOS firmware is not the same revision. Get lots of errors and most R&S apps refuse to work. Nothing really in Win2K worth having anyway - maybe the B17 IQ switching but you can get access to that in the latest DOS version I think...
Astrodev:
But this is where the CRTU has advantages over the CMU200 as it already runs Windows 2000 and since most of the base functionality is the same unless you need the additional features that can be found on some of the CMU's (but this does depend on finding the right one) it may be a better alternative.
I suppose as they are fundamentally the same hardware platform the decision over which to use is really dependant on the hardware and license options present on the specific units that are available on the 2nd hand market.
My approach to running the CMU200 was to pick up a CMW-CU which is essentially a PC with built in GPIB and designed to keep RF interference to a minimum as it is specifically for use in an RF test environment and although it is for use with the CMW500 is works well with the CMU200 and the CRTU.
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