CMU200 Options for tracking generator ===================================== Ebay supply: http://www.ebay.co.uk/itm/CMU200-Radio-Services-Monitor-Tracking-Generator-Duplexer-Measurement-Sources-/252464888662?hash=item3ac8147b56:g:B3EAAOSwbsBXowJ- This requires 9-12V. You feed in 1816.115MHz and pick up the spectrum analyzer first LO from the middle of the RXTX board. These are mixed to give a tracking generator. It works quite well, though there is some ripple. On the RXTX board there are two rigid SMA leads and a MCX lead which need disconnecting to remove the RXTX board. You will need to drill a hole in the air guide sheet to access the LO mcx connector. See: http://www.eevblog.com/forum/testgear/rohde-schwarz-cmu200/msg1007175/#msg1007175 This works up to 1200MHz. For 1200MHz to 2200MHz you use 843.085MHz, for above 2200MHZ you use 1816.115MHz again. The required frequency needs to be at as low a level as works, around -18dBm, and can be generated by the CMU2200. Too low a level gives more ripple on the response. The local oscillator can use the supplied cable, but could instead use a spare AUX1 BNC and lead if this is unused or not needed. Having all the connectors at the front is more convenient. Up to 1200MHz you get some ripple. This gets much much worse and attenuated as the frequency goes higher. It still works as a tracking generator, but you have to compensate for the tracking generator level changes. CMU200 is very sensitive to 1816.115MHz breakthrough to the first IF at 1816.115MHz. Ideally you would use an external oscillator and filter out 1816.115MHz before it reaches the CMU200. It is possible to use a mixer instead of the Chinese solution. A mixer could output down to DC, which would be useful for looking at signals below 10MHz(also possible is above 2700MHz) with a converter. The problem with a mixer is that you will get 1816.115MHz breakthrough. This breakthrough increases the apparent noise floor, so giving worse results. If you have a separate signal generator (I don't so have not checked this)and are looking at responses with little output at 1816,115MHz, for example a 10.7MHz xtal filter, then the mixer should work quite well. You would probably want to amplify the LO to get a good reference level. So mixer is possible, and within limits works, and in the end could be better than the Chinese tracking generator. For instant results use a mixer if you have a suitable one. For better results use the Chinese tracking generator, for best results you need to do some work. An improvement to the Chinese mixer would be to generate the required frequencies externally from the ref output. And add a notch filter after the mixer. To keep 1816MHz out of the CMU200. Pick your mixer for the correct frequency range and for good isolation. I got quite good results from a mixer, but it doesn't have the frequency coverage needed. Block diagram showing filter frequencies: http://www.eevblog.com/forum/testgear/gotcha-for-cmu200-and-crtu-users/msg694796/#msg694796 Tracking generator review: http://www.eevblog.com/forum/testgear/rohde-schwarz-cmu200/msg1006966/#msg1006966 Link to some tracking generator install photos I got from the seller: http://pan.baidu.com/s/1jIi5o8m The principle here is that the spectrum analyzer uses a fixed filter. It varies the local oscillator to convert the monitored frequency to 1816.115MHz using a mixer. So by mixing the LO with a signal generator set to 1816.115MHz we reverse this process and generate an output at the monitored frequency, so tracking the LO. Two photos of wide span with the tracking output fed to the RF4 input. One with RF set to 1816.115MHz covering 10-1200MHz and 2200-2700MHz, the other with RF set to 843.085MHz covering 1200MHz to 2200MHz. Both drop by about the correct amount when an (unknown frequency response, 6dB) attenuator is fitted. So a question. Is it possible to correct the frequency response to level the tracking generator? CMU200 - Method for listening to Audio without Audio Board!! Enjoy ================================================================== For all of you who want to expand how you use your CMU200 and actually listen to audio from the analyzer, here is a way to accomplish that. My Setup * CMU200 set up with spectrum analyzer running, enter frequency, set span to acceptable range (I set to .002) just for testing. * General Coverage Receiver capable of receiving 10.7 Mhz (Should be capable of type of modulation you wish to demod) * Connect IF3 RX OUT on rear of CMU200 to Antenna Input on General Coverage Receiver (You may choose to place an attenuator here) I didnt need to. * Start general coverage receiver and set to 10.7mhz and demod mode (AM,FM,FMW,LSB,USB) Whatever mode you need. * Adjust squelch and volume to your desired levels and listen away. * DONT Change the frequency of the general coverage receiver as it is relying on the IF RX 3 signal for its source. * Manipulate the CMU200 Frequency to whatever you desire, Play around with some settings. I am able to listen to AM,FM, FM Broadcast, LSB, USB. No issues, plus as the signal strength increases so does the IF level which allows the use of squelch. '73 K7RLW - RadioRick Rohde & Schwarz CMU200 TG: ========================== It doesn't have a tracking generator, simply because it's a communications test set designed for digital communication standards like GSM, W-CDMA, Bluetooth or GPS. What it has are one or two (depending on the options) RF generator(s), a Spectrum Analyzer (sweeping VSA), an RF Analyzer, a power meter (wideband and narrow band), and a 20 tone audio generator/analyzer, all in one box. You can replicate the tracking generator if you connect the CMU200 to a PC and command the RF generator via software to "sweep" through a frequency band while the SA is set to max hold. The dwell time for the generator needs to be larger than the sweep time, so it will be slow. But it works. Much easier and quicker however is just using a wideband noise source, which you can even build yourself. ========================== B11(simple ocxo), B41(audio analyzer) and B95(second RF generator). ========================== Ok, Thank You ZL1CVD for your comments.. I work in GPIB programming for a company, and although I don't have extensive experience in the matter, I don't have the time to play with the program inside the unit.. Long ago in the hacking games times, I run softice and cracked several programs in windows98, but nowadays my time is important to me and I have not the time nor patience to approach this issue. I prefer to use a laptop or rasperry pi or similar board to automatize via GPIB the measures as noise figure, tracking, swr plots, Third order intercept, 1dB compression, and all the measures that interest me. The GPIB support of the unit is very good, extensive, as example you can access files from hard disk through GPIB calls. However, if you make progress in the hacking I can support you by test or advice. You can transform a dll in a .h file to call from a programing language, but you will have only the entry points of the procedures inside the dll, not the information on parameters or functionality... So, if you call the dll it can crash, and it will crash every time. When I receive the new hard disk, i will see the innards of the file system.. I measured THD (as SINAD I cannot measure because my B41 unit has old firmware >:( ) on my 500MHz receiver with this little program: *CLS -> OUTP:STAT RF3 -> SOUR:RFG:FREQ 500 MHz -> SOUR:RFG:MOD FM -> SOUR:RFG:MOD:FM:FREQ 1KHZ -> SOUR:RFG:MOD:FM:DEV 3KHZ -> SOUR:RFG:LEV -40DBM -> INIT:RFG;*OPC -> CONF:AFAN:FILT:WEIG CCI -> INIT:AFAN;*OPC -> READ:AFAN? So, the units can work at the same time.. no problem.. :-+ Update: Works with python and VISA with Agilent usb<->gpib adapter, no problem.. I back up the Hard disk without problem. I see the dos app and found the version of the SW as 5.1 but the version of the audio FW is old 3.4.. It can be possible to update the firmware??? I think so.. It is detailed in the service manual as the board firmware must be updated after installation... I am not sure if I mess something.. Advice?? ==================================================================== The HDD of my CMU200 is a HITACHI MK2018GAP with 20Gbytes but with only a 2GB partition :-//. I try a KingSpeed SSD PATA 32GB with no luck. Also I try a hgst 40GBytes ATA from my old laptop with no luck. I think It is possible to enter the disk geometry manually in Bios, but I do not have information about the parameters of the disks. But It appears that the BIOS is very OLD and doesn't read new hard disk.. I will try with a Compact Flash Adapter... ==================================================================== Mixer_4_0Hz_Start_Freq.jpg 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 ======================================================================= i designed this board.now there is a new version . for this board power:DC 9-12V/0.33A RF IN:connect to rx/tx board rx lo port. P2:connect to front panel RF3 ,RF3 setting 1816.115M/-20DBM IF OUT:TG output 10M-1.2G/0DBM. any problem send email : bg7tbl@qq.com/BG7TBL@GMAIL.COM ======================================================================= B11: HW-option for CMU200: Reference oscillator OXCO, aging 2 X 10E-7/year B12: HW-option for CMU200/300: Reference oscillator OXCO, aging 3.5x10E-8/year B17: HW-option for CMU200: IQ/IF interface, analog, one channel B21: HW option for CMU200: Universal signalling unit CMU-B21V14 incl. CMUB54 B21/2: Universal Signalling Unit B41: HW-option for CMU200: Audio generator and analyzer B52: HW-option for CMU200: Speech codec for CMU-B21/var. 14 B52/2: Speech Coder f. CMU-B21/2 B53: HW-option for CMU200: Bluetooth extension for CMU-B21/var. 14 B53/2: Signalling Module f.Bluetooth B54: HW-option for CMU200 signalling module for AMPS, TDMA, GSM for CMUB21/var. 14 B55: Signalling Module f. €GPRS Applic. Test B56: HW-option for CMU200: WCDMA and data E2E for CMU-B21/var. 14 B66: Versatile base band board B83: HW option for CMU200: CDMA2000 Signalling Unit (requires CMU-U65) B85: HW-option for CMU200: 8K/8K ENH/13K speech codec for CDMA2000 signalling unit CMU-B83/V12 B89: HW option for CMU200: 1xEV-DO Signalling Module (requires CMU-B83/V22 and CMU-U65) B68: HW-option for CMU200 layer 1-board (3GPP/FDD, DL+UL) B95: HW-option for CMU200: Additional RF generator (max. input power 2 W) B96: HW-option for CMU200: Additional RF generator, 2 channels for GSM, CDMA, WCDMA =========================================================================== Ich habe mit eine PCMCIA-compactflash Adapter ein Backup gemacht auf eine cf-karte Geht einfach : PS/2 Tastatur anschließen, ‘F4’ taste drucken, die Software schließt sich, und man kommt auf die DOS-ebene (Dos6.22) Dann einfach mit Norton Commander alles kopieren (ich fand auf meinem Server noch ne Kopie 😉 ). Die CF-karte ist dann D: Am besten formatierst Du die in Deinem Notebook. Mit FAT, nicht FAT32 oder NTFS! Im CMU müsste das über FDISK laufen. Partition anlegen, aktivieren, formatieren. Dann den Volkov Commander installieren und ein dateiweises Backup erstellen. Die neue Platte wird dann mit DOS formatiert und alles wieder zurückkopiert. In der Datei SWOPT.DAT sind die Softwareoptionen gespeichert. Controller is a standard PC architecture running MS-DOS. CPU upgrades and SSD conversions are possible. FMR5 motherboard uses AMD K6-2/300 CPU (Socket 7). FMR6 motherboard uses Celeron Mobile CPU FMR6Plus motherboard uses Celeron Mobile CPU (socket 495), BIOS 1.00 supports Pentium III 933 Be aware of the following options. If installed, they reduce the max input power on RF 1, which may be undesirable: if R&S CMU-B95 is installed, RF 1 continuous input power = max 2 W if R&S CMU-B96 is installed, RF 1 continuous input power = max 2 W ================================================================================ Decrypt License File Keys: from Crypto.Cipher import ARC2 import struct for l in open("SWOPT.DAT"): if len(l) == 17: # == 18: see below !!! a, b = struct.unpack("