Presenting my new software for the SMA Spectrum Analyzer 138MHz-4.4GHz - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: July 24, 2016, 09:04:53 am
content: Hello,On eBay, a cheap redesign of the amateur NWT4000 devices is sold as "SMA Spectrum Analyzer 138MHz-4.4GHz". Bascially it uses only one ADF5430 chip instead of two and hence cannot be used for antenna tuning (which was the original NWT series purpouse), as the signal being output cannot be read back in at the same time (a second ADF5430 chip would be needed).The included software (WinNWT) is a freeware made by the original author of the NWT series of devices (NWT500), which is not particularily nice for pure spectrum analisys.I read the documentation, did some hacking and ended up programming my own spectrum analyzer software, more for fun and learning, than anything else.I came to this forum, following links regarding the Siglent SSA3021X and as Douglas Adams used to say: "I may not ended up where I wanted, but I ended where I needed to be."Anyway, check my forum:http://vma-satellite.blogspot.pt/2016/06/sma-spectrum-analyzer-138mhz-44ghz.htmlhttp://vma-satellite.blogspot.pt/2016/06/the-travellers-guide-to-spectrum.htmlhttp://vma-satellite.blogspot.pt/2016/06/138m-44g-usb-sma-signal-sourcesignal.htmlThe software is free, but I am distributing it myself, because I don't want Chinese eBay sellers making profit with it, when I had all the work and had to purchase two units to get it done.Regards,Bicurico

author: Fraser
author_rank: Super Contributor
timestamp: July 24, 2016, 09:42:29 am
content: Thank you for your hard work on this. I own several such units and shall take a look at your web pages 👍Fraser

author: technogeeky
author_rank: Frequent Contributor
timestamp: July 24, 2016, 11:23:22 pm
content: Nice work!I might just add this spectrum analyzer to my short-list of things I can't yet afford.Forgive me if this was in the videos, but why did you need to buy two of them in order to develop the software?I understood why you wanted two TV tuners to do what you did.In any case, great work!

author: Bicurico
author_rank: Super Contributor
timestamp: July 25, 2016, 02:19:57 am
content: Hello.I broke the first one just a few days after receiving it by connecting a cable from my satellite receiver. I did not pay attention and it carried live voltage to control the LNB. I already started my software development and did not want to live without it anymore, so I bought a second one.Simultaneously, I bought 5 IAM-81008 as this IC was likely to be the culprid. After swapping it out, the device was working again, so now I have two.One thing I am considering is the possibility to use both simultaneously to double the sweep speed. But for this I definitely need to implement some calibration routine first.Also, having two of them allowed me to see that they have slightly different performance. Some calibration algorithm is definitly required for best results.Regards

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 25, 2016, 02:55:33 am
content: Just a correction, the chip part number is ADF4350.

author: technogeeky
author_rank: Frequent Contributor
timestamp: July 25, 2016, 04:23:21 am
content: Quote from: Bicurico on July 25, 2016, 02:19:57 amCouldn't you use two of them to do whatever the NWT4000 can do? I don't have any interest in "antenna" tuning anyway, but I was just curious to know.Thanks,-tg

author: Bicurico
author_rank: Super Contributor
timestamp: July 25, 2016, 06:55:11 am
content: @Alex: Thanks! That was a wild typo...@tg: You could in theory, but WinNWT would not work, as it is not prepared to control two separate devices. I have thought about that, too, especially since two "SMA Spectrum Analyzer 138MHz-4.4GHz" cost less than the NWT4000. But beware: the original NWT device apparently features 10 bit resolution, while this "SMA Spectrum Analyzer 138MHz-4.4GHz" only has 8 bit resolution. There seems to be a difference, so don't just go for the lowest price!Because I am not into antenna tuning, either, the "SMA Spectrum Analyzer 138MHz-4.4GHz" is really OK for the price it is sold: 50-60 Euro.Regards

author: technogeeky
author_rank: Frequent Contributor
timestamp: July 25, 2016, 09:30:00 am
content: Quote from: Bicurico on July 25, 2016, 06:55:11 amI was thinking along the lines of feeding a selected portion of the input to the output so you cloud view it with an oscilloscope.I really don't know what I'm talking about, so if this doesn't make sense, just ignore it.

author: Bicurico
author_rank: Super Contributor
timestamp: July 25, 2016, 11:25:44 am
content: You cannot output part of the input. You can select a given frequency to output a reference signal and then:1) measure it directly2) measure it using for instance the antenna you want to tune or the cable whose attenuation you want to determine.Actually, using my software as it is, you could use the first session to generate the signal and the second session to measure.And that should be viable in WinNWT as well.Regards

author: technogeeky
author_rank: Frequent Contributor
timestamp: July 25, 2016, 06:16:54 pm
content: Quote from: Bicurico on July 25, 2016, 11:25:44 amI think I'm going to wait until you release the software to buy one of those, but I can't imagine getting anywhere near that good of a spectrum analyser for anywhere near that price.

author: Bicurico
author_rank: Super Contributor
timestamp: July 25, 2016, 07:09:39 pm
content: Well, 50-60 Euro is not much money, indeed...The spectrum is kind of slow and precision is almost non-existant at this point. I need to figure out how to implement a suitable calibration routine. Fortunately I own a professional calibrated signal source plus several high end TV analyzer/field meter with spectrum analyzer, so I have somthing to work with.Regarding the "release": you can have the software whenever you want - just send me an e-mail and you get a copy.Regards

author: Bicurico
author_rank: Super Contributor
timestamp: August 21, 2016, 11:16:51 am
content: Hi,Just published a new post on my blog: did some reflectometer measurments!Cool! It actually works.Regards

author: TurboTom
author_rank: Super Contributor
timestamp: August 21, 2016, 06:11:07 pm
content: Unfortunately, you cannot really do narrow band work with this device. Since it's just a plain down-converter with a log detector at the IF output of the mixer, you won't detect any signal when you're right on the frequency (IF 0). You will find the signal mirrored to the left and right of the actual frequency. This won't really matter if you look at large spans of several or even hundreds of megahertz. But what matters in this case is that the PLL output of the device (which is also used as the LO signal for the mixer) is more or less a square wave (at the lower frequencies easily checked with a fast oscilloscope). At least it carries a whole lot of powerful harmonics. Since these harmonics also result in mixing products, the spectrum will be very ugly with lots of mirror and "ghost" signals that make it very difficult to get a clue of the actual input signal. I'ts a nice toy to start tinkering in the microwave frequency range for little money. But if you want to do any half-way serious measurements, do yourself a favor and buy, steal or borrow a real spectrum analyzer.Anyway, congratulations on your work, Bicurico, your software looks superb and appears to be much easier to use than the original WinNWT software (that even doesn't support the device completely...).All the best,Thomas

author: Bicurico
author_rank: Super Contributor
timestamp: August 21, 2016, 06:27:31 pm
content: Thanks Thomas.I actually do own a lot of professional equipment, mainly TV field meter, encoders and modulators, apart from lots of receivers, dishes, etc. My collection of field meters has more than 20 devices...I just purchased an SSA3021X, as well.Why am I writing the software and spending time with this cheap device, if I could just use my R&S, Rover Instruments, Kathrein, Spaun, etc field meter?The answer is simple: it has been a steep learning curve! I know now more about spectrum analysis than I would by just reading textbooks.And yes, you are right: the spectrum does not look very good for longer cables. But activating the average function, I could get a readable spectrum for a 100m cable. I put a new entry on my blog.Also, you are right: I am mostly interested in TV applications and hence wide spans our several megahertz are ok.Regards

author: Bicurico
author_rank: Super Contributor
timestamp: August 22, 2016, 01:26:47 pm
content: Hi,I was struggeling to provide an easy download, which could be updated with the latest release.Found out i could just attach it here...This version has a bug in the activation code routine corrected. If you already downloaded from TinyUpload, please use this attached version, instead.Send me an e-mail with the system code and you get an activation code for free.Regards

author: nctnico
author_rank: Super Contributor
timestamp: August 22, 2016, 01:45:34 pm
content: Just question: does the generator mode support stepped sweeping? Go through a frequency range and wait for a while until going to the next frequency?

author: Bicurico
author_rank: Super Contributor
timestamp: August 22, 2016, 01:52:44 pm
content: Not in the current release.It could be implemented, though.Like, you specify:Start Frequency (MHz):End Frequency (MHz):Step size (MHz):Pause (ms):This would start at Start Frequency, Pause, Increment, Pause, Increment, ... -> while Current Frequency <= End FrequencyIs that what you want/need?What would you want to use it for?Note that you CANNOT connect the SMA Output connector to the SMA Input connector! It will not work, as you only have one ADF4350: while the device is generating the output signal, it will not read the input signal. When it does read the input signal, it won't be outputting anything. Effectively you would need two devices or, better, purchase the NWT4000.Regards

author: nctnico
author_rank: Super Contributor
timestamp: August 22, 2016, 02:07:51 pm
content: Yes!Long story: Many years ago I build an ADF4350 board which could do a stepped sweep as you describe but I hacked the board badly during testing (in the end my spectrum analyser turned out to be faulty) so I would need to build another one and see if I can find/polish the firmware but even then it is command line only. All in all it is just easier to buy a readily made unit from Ebay and be lazyI just like to have a device which is somewhat useful beyond 3GHz (that is as far as my RF generator goes).

author: Bicurico
author_rank: Super Contributor
timestamp: August 22, 2016, 03:27:22 pm
content: Hi,I just had some time and the way the software is structured, it was easy to implement the new Sweep Generator tab.The pictures show the tab in action and the result using a professional spectrum analyzer using MAX HOLD on the current trace.Regards

author: nctnico
author_rank: Super Contributor
timestamp: August 22, 2016, 06:22:53 pm
content: Great! I ordered a SMA spectrum analyser from Ebay so I have to wait until it arrives to test your changes.

author: bitseeker
author_rank: Super Contributor
timestamp: August 23, 2016, 12:52:15 am
content: Bicurico, does your software also work with the boards/boxes that use the single ADF4351 (starts at 35 MHz instead of 138 MHz)?

author: Bicurico
author_rank: Super Contributor
timestamp: August 23, 2016, 07:09:20 am
content: I only own two of the 138MHz-4.4GHz versions.I *think* that the 38MHz-4.4GHz version with the ADF4351 *should* just work with the current software as it is, though you won't be able to select frequecies lower than 138MHz, because I verify user input.I could let the user device if the software should allow 38MHz-4.4GHz or 138MHz-4.4GHz, but I have no way of testing it. Any volunteer is welcome: just run the software and tell me if indeed it works with the 38MHz-4.4GHz version. If so, I implement a selector on the SETUP TAB.Regards

author: TurboTom
author_rank: Super Contributor
timestamp: August 23, 2016, 08:32:19 am
content: I've got the 35MHz version of the "box" but currently it's at home and I'm on work. I can try it on friday. But I've got another idea on how to improve the gadget for TG/scalar network analyzer mode which currently isn't possible due to the zero IF situation:I think it should be working if we use another double-balanced mixer on the TG output (just the same as on the input) and feed a sine signal (maybe 10...100kHz) on the second mixer input (or back-feed it to the IF output, depending on the possible frequency ranges) so the mixer outputs only the two sidebands wich can be easily analyzed by the input section. This won't provide really narrow bandwidth but for matching an antenna or input filters, it should be sufficient. And it can be easily implemented as an add-on. To compensate for the mixing losses, an amplifier may be required though. Maybe Bicurico could implement a "normalization" function in his software for this application (if it will ever be tried out).Cheers,Thomas

author: Bicurico
author_rank: Super Contributor
timestamp: August 23, 2016, 08:52:37 am
content: TurboTom: I might be saying something stupid (I am an amateur when it comes to RF electronics - well, to electronics in general)...Wouldn't it be easier to just use two SMA Spectrum Analyzer devices? One for Input, one for Output?Also, I was using the BG7TBL noise source (until I fried it by accident - the PCB touched a cable connector lying around and made a short-circuit...- a replacement has been ordered), and the results weren't that bad.This is to say that I would not know how to implement your suggested hardware modification.My software does lack one big feature: calibration! I need to think how to do that.Regards

author: Bicurico
author_rank: Super Contributor
timestamp: August 30, 2016, 10:49:37 pm
content: Hi,I published a new version of my software!Change log:- Corrected dBm calibration for improved precision- Implemented new function: Powermeter - not sure if it is correctly implemented- Implemented new graphics engine- Spectrum/Waterfall in main image can be saved as PNG- Introduced change log- Cleaned up GUI (Setup screen)- Cleaned up some code- Added a SET button on Sweep Generator (less prone to crash due to open RS232 port)Download it from herehttp://www.filedropper.com/smasimplespectrumanalyzer-2016-08-30More information on my blog.Regards,Vitor

author: Fraser
author_rank: Super Contributor
timestamp: August 30, 2016, 11:06:52 pm
content: Sorry I have not provided any feedback on this software yet. I am buried in thermal camera repairs so have not had time to play with it yet.I will provide feedback as soon as I get some spare time.Many thanks for your hard work on thisFraser

author: Bicurico
author_rank: Super Contributor
timestamp: August 31, 2016, 09:35:49 am
content: Quote from: Fraser on August 30, 2016, 11:06:52 pmI read your post about the thermal imaging repair... Now THAT seemed to me like hard work! I found it particularily cool that you have acess to X-ray machine.Regards,Vitor

author: Fraser
author_rank: Super Contributor
timestamp: August 31, 2016, 10:00:53 am
content: If you like my use of X-Ray, I produced a thread full of pictures that I have taken with both my original and newer Faxitron MX-20 machines.https://www.eevblog.com/forum/projects/the-x-ray-image-thread-by-aurora-various-electronics-via-x-ray-imaging/msg748531/#msg748531Fraser

author: nctnico
author_rank: Super Contributor
timestamp: September 08, 2016, 10:40:52 pm
content: I tried to run the software but Windows says it isn't a valid .EXE file! Also the .exe is only 35kB and that seems a bit low. I'd expect an exe of several MB at least.

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 11:50:46 am
content: Hi,The executable inside the ZIP Archive is indeed only 35kB! It was done in Visual Studio .net 2012 using VB .net. It does not require any installation or additional files. The little data it needs to store (currently just the activation code and the serial port) resides in HKEY_CURRENT_USER\SOFTWARE\SMA Simple Spectrum.You do need to have a modern Windows version with .net Runtime installed. I have not tested the executable in older Windows releases! Not sure if it runs in Windows XP.If you get an invalid *.EXE file error, you are either using an older Windows version, don't have .net installed or have a corrupt download.Regards,Vitor

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 01:07:28 pm
content: Aha, ofcourse I tried to run it in XP! Does it run out of the box on Windows 10 (32 bit)? If not what .net installer do I need to install first?

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 01:14:24 pm
content: It certainly run out of the box on my Windows 10 @ 32bit tablet (x86).It is actually nice to use the software on a tablet with an OTG-adapter, as you get a really small setup. It's what I use when travelling.Regards,Vitor

author: R005T3r
author_rank: Frequent Contributor
timestamp: September 11, 2016, 01:43:13 pm
content: The link on filedropper.com don't redirect correctly.Anyway, thanks....

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 03:17:17 pm
content: The link on my blog (last post) works OK:http://www.filedropper.com/smasimplespectrumanalyzer-2016-08-31Just tested it myself and the zip contains an executable which opens fine.Regards,Vitor

author: R005T3r
author_rank: Frequent Contributor
timestamp: September 11, 2016, 04:51:15 pm
content: Confirmed. It works.

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 06:05:47 pm
content: Unfortunately my SMA SA does absolutely nothing with the softwareThere is no signal output at all when used as a generator.There is also no indication whether if it has the right firmware, whether it is communicating OK and so on.

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 06:09:04 pm
content: As far as I know, there is only one firmware, or, to be correct: all FW version identify themselves as "119" (literally sending one Byte &D119)...Which device do you have? Did you configure the correct COM-port? Did you connect a signal in the IN-port?With my software there is literally nothing to install or configure: just start it and select the correct COM-port. Hit the START button on the first tab and you should see something.Send me a screenshot!Regards,Vitor

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 06:12:00 pm
content: I want to use it as a generator.

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 07:38:22 pm
content: I tried a signal from an RF generator connected to the input as well but still no-go.Edit: I think my unit is broken. The original software shows nothing as well. I'm going to resurrect my own signal generator board; this is turning into a time sink and all I want to do is do a quick sweep to see if my spectrum analyser is working.

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 07:50:33 pm
content: The signal output doesn't show anything on the screen: you just activate it with the SET button and that's it.Even without a signal present on the input connecter, the spectrum should show the noise floor.Perhaps your device is seriously broken? Does it work with WinNWT?Regards,Vitor

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 08:03:14 pm
content: The original software (which is an utter mess indeed) does nothing as well.

author: Bicurico
author_rank: Super Contributor
timestamp: September 11, 2016, 08:05:54 pm
content: Sounds like a broken device.If you go to the Device Manager, do you see the COM-port?Does the green LED turn on, when you connect the device to the USB port?Do you get an error message with my software? Did you select the correct COM-port?Regards,Vitor

author: nctnico
author_rank: Super Contributor
timestamp: September 11, 2016, 08:31:11 pm
content: Yes, yes and yes. The original software (running on Linux) also shows the firmware version so I guess the communication is working. I'm going to return it.

author: Bicurico
author_rank: Super Contributor
timestamp: October 02, 2016, 03:29:35 pm
content: Hi,Just updated my software with a new function: it now shows the RWB value.Download link on my blog, together with a small explanation of why you select Samples instead of RWB.Regards,Vitor

author: bitseeker
author_rank: Super Contributor
timestamp: October 03, 2016, 10:47:56 pm
content: Thanks for the update, Vitor. You meant RBW, correct?

author: Bicurico
author_rank: Super Contributor
timestamp: October 04, 2016, 06:16:05 am
content: Yes.

author: Bicurico
author_rank: Super Contributor
timestamp: October 04, 2016, 11:22:32 pm
content: Today I made some major improvements with the graphics.Download available athttp://www.filedropper.com/smasimplespectrumanalyzer-2016-10-04Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: October 05, 2016, 11:57:03 am
content: Here is a video showing of the latest software release. The video shows the ASTRA 19.2E satellite spectrum.https://youtu.be/4edLLw_7NRgRegards,Vitor

author: vordme
author_rank: Newbie
timestamp: October 09, 2016, 05:11:26 pm
content: Hi Vitor,congratulations for this nice job..here testing 430 Mhz antenna

author: Bicurico
author_rank: Super Contributor
timestamp: October 09, 2016, 06:24:05 pm
content: Thanks for sharing!Nice to see some use for the SMA Simple Spectrum Analyzer!Question: is the software easy enough to understand the different functionality or is a manual required?Regards,Vitor

author: vordme
author_rank: Newbie
timestamp: October 09, 2016, 07:12:27 pm
content: Quote from: Bicurico on October 09, 2016, 06:24:05 pmeasy to understand, but HELP option is always welcomeRegards

author: Bicurico
author_rank: Super Contributor
timestamp: October 12, 2016, 09:52:55 pm
content: Hi,I made some important additions to my software!It is now possible to directly enter the center frequency value, as well as, the span value. Additionally, it is possible to "zoom in and out" by increasing/decreasing the span value with the -/+ buttons.Finally, I changed the user interface a little.I think the chinese "138MHz~4.4GHz USB2.0/3.0 SMA Signal Source Signal Generator Spectrum Analyzer" turns into an actually pretty useful device with my software! Definitly worth the price for hobby/amateur or educational use.As always, the latest download links are on my blog:http://vma-satellite.blogspot.pt/Regards,Vitor

author: bitseeker
author_rank: Super Contributor
timestamp: October 12, 2016, 10:44:57 pm
content: Very nice indeed! Thanks for all your work on this, Vitor.

author: Bicurico
author_rank: Super Contributor
timestamp: October 30, 2016, 07:51:52 pm
content: Hi,New version online!Features:- New GUI layout: All buttons and controls went to the right side of the spectrum display. This looks more like a regular spectrum analyser and makes the window compatible with screens that have reduced vertical resolution.- Support for ADF4350/ADF4351: if you are luck to have the more expensive version with the ADF4351 and a frequency range of 35MHz up to 4.4GHz (instead of the ADF4350 with 138MHz-4.4GHz), you can now select it and benefit of the whole frequency range!Regards,Vitor

author: 3roomlab
author_rank: Frequent Contributor
timestamp: November 02, 2016, 02:02:01 pm
content: my gadget itch made me buy this after reading the threadsince i am a win XP user, for other who have problem with FTDI driver, please see this "driver rescue" post.http://forum.gsmhosting.com/vbb/f684/ft232r-repair-official-guide-1875025/the driver which i triedhttp://www.mediafire.com/download/ku9tckrt8rpf62w/CDM_2.04.06_WHQL_Certified.7zv2.04.06 works so far (with the original NWT software), i did not have to go thru the soft mod process, it is a straight driver install. ie : driver not found --> point to v2.04.06 driver --> driver found.the driver which seller supplied is broken, doesn't install (maybe v2.12.14 is for newer Win OS, not XP)from the doc manual, it seems that there is another even more powerful version NWT 6000, which gives 25M to 6Ghz (i think i got mine as v4000-1, ~138Mhz).does anyone know if 4000 --> 6000 is simply a chip swap?

author: Bicurico
author_rank: Super Contributor
timestamp: November 02, 2016, 02:20:22 pm
content: I would imagine that the 6GHz version uses a different firmware on the Atmel.Probably you can just exchange the ADF4350 with the ADF4351, for 138MHz-4.4GHz or 35MHz-4.4GHz versions. I think so, because you can actually set 35MHz on the ADF4350 version. But I have not tested it.Regards,Vitor

author: 3roomlab
author_rank: Frequent Contributor
timestamp: November 02, 2016, 04:47:44 pm
content: *update : i am beginning to understand why this unit needs a better GUI.in v1 hardware, if i scan below 138Mhz, the data will display nothing useful, in full scan like this pic, the real data appears after the 130Mhz mark.since nobody have posted any PCB view of the insides, here is the 1 i got. made 9 months ago.the PCB have been washed with alcohol 4x as there is alot of flux sitting around the SMD, esp those chips.there are 3 JP headers for factory (or modders), and there is a very interesting 3 pin VR unpopulated which says ... " F ADJ" ... HMMMMM ? adjust frequency? hee hee hee ...i have no expertise in reversing any of this kind of hardware, but this pic should make itchy fingers become interested in trying something like Jtags etc ...i also saw the NWT6000 on ebay going for about USD312.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: November 03, 2016, 11:10:43 am
content: Hello,I've got new NWT6000.With WinNWT sorftware it works fine, exactly like NWT4000.Bicurico, I'll try to test it with your software. But I noticed you turn off tracking generator, so it can work as spectrum analyzer only, not as scalar analyzer.Here are the internals. Inside there is a board with sma connectors, then sma-sma semi rigid cables to sma-N adapters, 2 extra N-sma adapters and 2 sma-sma flexible cables.On the photo I've disconnected sma-N adapters, and attach 2-8GHz directional coupler to check some antennas.

author: Bicurico
author_rank: Super Contributor
timestamp: November 03, 2016, 12:34:15 pm
content: Cool!How much did it cost? Can you post a picture of the other side of the PCB? I would like to see what IC is used instead of the ADF4350/ADF4351.Please try it with my software - it should work up to 4.4GHz. I could add a selection for the frequency range of NWT6000, if it is just a matter of adjusting the frequency limits.My software only uses the spectrum functionality, because my device is the cheap SMA device with only one ADF4350. It cannot input and output RF signal simultaneously. I implemented it this way, so you can at least run two windows of my software with two SMA devices: one for input, one for output... Interestingly, I have not tested that so far, despite having two SMA devices. Time is to short.My software is definitly not prepared to work as a scaler analyser. I would have to own a NWT4000 or NWT6000 to implement that, but right now I cannot afford that.Again, for everyone:NWT500/4000/6000 uses two syntheziser chips. This means they can simultaneously read the RF signal on the input connector, produced by the output connector.The NWT4000 uses two ADF4350 or ADF4351.SMA Simple Spectrum Analyser: there are two versions (ADF4350 and ADF4351). They only feature ONE synthesizer (ADF4350/ADF4351). Hence, they can EITHER output an RF signal or input an RF signal, but not both simultaneously!The ADF4350 has a frequency range of 138MHz to 4.4GHz.The ADF4351 has a frequency range of 35MHz to 4.4GHz.In the latest version of my software, you can switch between these two versions.I could add support for other frequency ranges, provided that the rest of the firmware is compatible.Regards,VitorRegards,Vitor

author: hendorog
author_rank: Super Contributor
timestamp: November 03, 2016, 07:15:49 pm
content: Quote from: Bicurico on November 03, 2016, 12:34:15 pmGotta be a MAX2870 or MAX2871. They are quite similar to the ADF4350/51 - there is a compatibility paper on the maxim site.

author: Bicurico
author_rank: Super Contributor
timestamp: November 05, 2016, 07:17:45 pm
content: Hi,New version available on my blog.New features? Surprise!Regards,Vitor

author: Ivan7enych
author_rank: Regular Contributor
timestamp: November 05, 2016, 11:07:00 pm
content: Quote from: hendorog on November 03, 2016, 07:15:49 pmYou are right, it uses max2870I've made a hires foto of the NWT6000 board with removed shields.https://yadi.sk/i/V7P6e5U3y4rQtTracking generator is based on max2870 and 3dB attenuator made of 0603 resistors.Input goes to mixer (looks like IAM-81008 ), LO is the same max2870 (it generates frequency 250KHz lower than tracking gen).Output from mixer goes through series of LC filters to logarithmic power meter AD8307, it's output goes to ADC input of atmega 328.

author: Bicurico
author_rank: Super Contributor
timestamp: November 06, 2016, 12:18:48 am
content: QuoteI agree 100%!The design is always the same, tracing back to the original NWT500. The magic happens in the synthesizer: it is either the AD9858 (NWT500), the ADF4350/ADF4351 (NWT4000 and SMA Simple...) or the MAXIM 2870E (NWT6000).If you attach a signal cable on the RF input port with more than +10dBm or with voltage, you will kill the M810 (aka IAM-81008) IC. That happend to me on day 2. I ordered replacement IC from AliExpress and after swapping the IC, everything was running again.I wonder if the manufacturer of the NWT500/NWT4000/NWT6000 actually uses different firmware on the Atmel... If not one could i.e. exchange the ADF4350 for an ADF4351.Anyway, thanks for the picture.Last question: how fast is the sweep with 500 and with 1000 samples? I looked at the eBay description of the NWT6000 and they mentioned 500 samples in 4 seconds! Thats actually slower than the "SMA Simple..." device with one ADF4350. I wonder if it's because the NWT6000 is indeed slower or because they measured it with the WinNWT software.Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: November 06, 2016, 07:19:46 pm
content: New Version: support for user configurable LOF, to visualize Fundamental Frequency value instead of Intermediate Frequency. Nice for satelllite TV applications.Regards,Vitor

author: 3roomlab
author_rank: Frequent Contributor
timestamp: November 18, 2016, 05:43:23 pm
content: Quote from: Ivan7enych on November 03, 2016, 11:10:43 amwere you measuring SWR ?

author: Ivan7enych
author_rank: Regular Contributor
timestamp: November 22, 2016, 12:46:41 pm
content: Quote from: 3roomlab on November 18, 2016, 05:43:23 pmYes, here are an example charts from WinNWT. Upper orange graph is unterminated port (100% reflection), lower pink chart is 50om terminated (almost no reflection), all other charts - reflection from different antennas (all seen on photo) declared as 5.8GHz.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: November 23, 2016, 03:41:36 pm
content: what did you modify in your set? the aluminium shield?

author: Bicurico
author_rank: Super Contributor
timestamp: November 27, 2016, 05:32:38 pm
content: Hi,I have been continuing my work on this software and today I finished a major new function, which is unique, as far as I know.You can now record and playback the live spectrum.This is great for documentation of intermittent signals, for example. Also, you can just keep the recording go for as long as you want (free file space provided, but then, the spectrum does not take up that much space).You can share your HF findings on the spectrum!And finally, I think it is great as an educational tool, because you can now use the software without owning the hardware device! Just share/download a spectrum log.As usual, more info and download on my blog.Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: December 01, 2016, 02:52:33 pm
content: Hi,This is to let you all know, I have just pulished the latest release of my software, including a vastly updated user manual.Functionality now includes GPS position information on log files, as well as, visualization of frequency logs on Google Maps!Available on my blog:http://vma-satellite.blogspot.pt/Regards,Vitor

author: milamber
author_rank: Contributor
timestamp: December 01, 2016, 08:16:00 pm
content: Quote from: Bicurico on December 01, 2016, 02:52:33 pmThanks for sharing - following this thread with great interest.

author: technogeeky
author_rank: Frequent Contributor
timestamp: December 09, 2016, 02:04:20 pm
content: Quote from: Bicurico on December 01, 2016, 02:52:33 pmVitor:Can you (hopefully somewhat quickly) post an update about using two copies of the software and two SMA units to do input/output simultaneously? I don't know much about spectrum analysis, but I know I simply cannot afford a real spectrum analyzer. However, I have heard musings that Santa might be capable of delivering a pair of SMA units around Christmas time if ... Santa ... orders soon enough.One concern I have toward getting the 135MHz (versus the 35MHz) version is that my current oscilloscope (Rigol 1054z) can only operate up to 100MHz, so I won't have any overlap. I thought about getting one 35MHz - 4.4 GHz version, and one of the NWT500 versions -- so I could see a significant amount of overlap on the scope and SA, but I think it would be better to have two identical units.Let me know your thoughts on this.Also, any idea whatthis boardandthis boardare? And would they be useful for your/our means?

author: Bicurico
author_rank: Super Contributor
timestamp: December 09, 2016, 02:14:07 pm
content: You can use as many copies of my software, as you want, provided each accesses one devices exclusively.However, my software does NOT synchronize the output of device 1 with input of device 2, which is what you would want to do in TG (tracking generator) mode.I *could* implement that, but it is not currently on my TODO list.Why? Because you can just use a noise source to do smilar things. The same guy's selling the SMA devices, sell this low-cost noise source, also. Price is around 15 Euro, but get one with an aluminium case.The technical reason: I would have to issue commands to two different serial ports, wait for each device to answer and then somehow synchronize everything. Sounds easier than it is to implement and I haven't really tried it.The two boards you linked are Chinese clones of the official development boards from Analog Devices for their ADF4350/ADF4351 IC's. They can be used to implement a signal generator. Not that useful, I think, but a cheap way of purchasing the IC itself, in case you just need one and can afford the waiting time for shipment.Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: December 15, 2016, 12:34:02 am
content: Hi,I uploaded a few new versions meanwhile (always worth to check my blog - just click on the small globe under my profile picture).I noticed that some potential users were not being addressed properly because I implemented a frequency resolution of 1 MHz (which is fine for my aplications, but I accept that there are other applications...).So the latest release allows frequency input in MHz or KHz and the frequency resolution is now 1 KHz. Frequencies are displayed in MHz with three decimal places.Regards,VitorPS: Did I mention that I implemented a "satellite identification algorithm through transponder pattern matching"? I am actually proud of it!

author: 3roomlab
author_rank: Frequent Contributor
timestamp: December 15, 2016, 06:03:08 am
content: wait a minute, your version now can scan to 12Ghz?(in any case, i have given away mine to a friend. no RF fun for me for now)

author: Bicurico
author_rank: Super Contributor
timestamp: December 15, 2016, 07:48:15 am
content: No.The device only supports up to 4.4GHz.My software can however display either IF or RF. If the user specifies a LOF (local oscillator frequency), frequencies are shown as IF, including full support for inverted spectrum.This is nice when hooking up satellite LNB in C, Ku or Ka bands.Regards,Vitor

author: RF-DX
author_rank: Newbie
timestamp: December 19, 2016, 09:46:43 pm
content: HI,In search of a simple Spectrum Analyzer I came across this interesting post.I like the software of "Bicurico" very much. Good work.Since I also work in the frequency range below 100 MHz, I would buy either the"35MHz-4.4GHz USB SMA Signal Source Signal Generator Simple Spectrum Analyzer" or the"NWT4000-2 35MHz-4.4GHz Sweep Simple Spectrum Analyzer Signal Generator".I would like to show with the device only curves of filters.No antenna tuning, etc.Now I have a question about this.Is the quality of the display of the curve equally good for both devices, or is there a worse display for an external signal source (noise generator)?(Sorry for the Google-English.)

author: Bicurico
author_rank: Super Contributor
timestamp: December 19, 2016, 10:24:29 pm
content: Hi,1) You can PM me in your native German language, if you want - I am a native German speaker, too.2) The (unofficial) forum, where my software is discussed almost on a daily basis is here:https://www.satellites.co.uk/forums/threads/using-the-138mhz-4-4ghz-usb-sma-source-signal-generator-simple-spectrum-analyzer-for-tv-catv-sat.169694/3) My roots come from TV/CATV/SAT applications, which is why my software has some peculiar functions that appeal to i.e. SAT DXers.4) The difference between the SMA Low cost model and the NWT400 model is that the first one has just one ADF4350/ADF4351 (138MHz-4.4GHz/35MHz-4.4GHz), while the NWT4000 has two such IC's. This effectively allows the NWT4000 device to SIMULTANEOUSLY emit and receive a signal, which is what you want for SWR measurements - it's basically a tracking generator, where both IC's are sync'ed so that one emits at a given frequency at the output port, while the other reads the power of said frequency in the input port. The device then sweeps this across the selected frequency range. Other than that, expect exactly the same curves on both devices, as they use the same synthesizer for frequency conversion, the same logarithmic converter and the same microcontroller.5) I do not own a NWT4000 and hence I did not implement any special functionality in my software to benefit from having two ADF4350/ADF4351. I will NOT implement such a tracking generator, as doing so requires me to have a NWT4000, to figure out how the commands work. I *may* implement this functionality if/when donations reach a value that allows me to purchase such device.6) You can use two SMA devices running my software in two separate sessions. This will still not allow use as a tracking generator, because there is no sync between both devices. I made tests, even with relatively long pauses in the sweep, but results are unusable.7) You can do filter measurements using a noise source. This has been discussed before and I have written about this in my blog. You can buy relatively cheap noise sources designed by the same guy that designed the SMA/NWT clones: BG7TBL. They cost around 20 Euro and are low quality if compared with a "real" noise source, but excellent for the price they cost. I mention them in my manual, too.Regards,Vitor

author: RF-DX
author_rank: Newbie
timestamp: December 19, 2016, 10:49:19 pm
content: Thanks for the answer.I sign up tomorrow by PM.

author: technogeeky
author_rank: Frequent Contributor
timestamp: January 09, 2017, 06:40:50 am
content: I will need to sign up soon, since I finally ordered the 4.4GHz model.It appears there is also the the "sma spectrum" version of the NWT6000 is now available for purchase on several markets.This storehas sold several of the 25MHz - 6GHz versions. These would presumably be a very nice starting point, especially if they could be made to work with this software.If anyone ends up purchasing one of these, please let us know.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: January 09, 2017, 09:32:38 pm
content: Quote from: technogeeky on January 09, 2017, 06:40:50 amHi,I have both versions - 25M-6G and 135-4.4Ghttps://www.eevblog.com/forum/testgear/presenting-my-new-software-for-the-sma-spectrum-analyzer-138mhz-4-4ghz/msg1062778/#msg1062778

author: RFminer
author_rank: Newbie
timestamp: March 14, 2017, 01:29:55 pm
content: Hi Ivan,could you please send me link where you bought your NWT6000 /25M-6G/ instrument? I would like to buy too... How much did it cost? Thx!

author: technogeeky
author_rank: Frequent Contributor
timestamp: March 15, 2017, 11:26:22 am
content: Quote from: RFminer on March 14, 2017, 01:29:55 pmRemember to distinguish between the NWT6000 and what I'll henceforth call SMA6000. The NWT6000 is ~ $300 or so. The SMA6000 can be had as cheap as ~ 100 or so.Just google the phrase "25M-6G" on ebay or aliexpress or whatever site you like.

author: Patrick-AT
author_rank: Newbie
timestamp: April 17, 2017, 12:41:40 pm
content: Hey guys!Sorry for my inrush. Since this forum was useful for me for the last year i decided to register, because there is one specific question i haven't found an answer for. I ordered one of the "NWT4000-1 138M-4.4G sweep simple spectrum...".What do the 3 green LEDs (D4, D3, D2) on the board stand for?D4 (PWR) at the boards front for power... OK.But what about D2 (LO L) - maybe local osc locked - and D3 (LG L)?Greetings, P.

author: Bicurico
author_rank: Super Contributor
timestamp: October 12, 2017, 08:05:53 am
content: Hi,This is to let you guys know that the latest version now features:- User configurable colours- Impedance measurement: allows to determine i.e. the impedance of an antenna - requires NWT device or noise generator- Reflectometer measurement: allows to determine the length of an unterminated cable or the distance to a fault in a terminated cable - requires NWT device or noise generatorRegards,Vitor

author: Fraser
author_rank: Super Contributor
timestamp: October 12, 2017, 03:00:39 pm
content: Excellent work. I have a couple of these units sitting unused in my lab. Time to blow the dust off of them and fire em up 🙂👍Fraser

author: markl17@gmail.com
author_rank: Newbie
timestamp: March 13, 2022, 06:20:28 pm
content: hi vitay how can you make max2870 have precision of 1hz not 1khz and get it make a sin wave not squre

author: Bicurico
author_rank: Super Contributor
timestamp: March 14, 2022, 08:54:53 am
content: Quote from: markl17@gmail.com on March 13, 2022, 06:20:28 pmHello,First off, I have to be honest: it annoys me when people don't put in the effort to at least write my name correctly.Then, I don't fully understand your question: you have a completely different device than those supported by my software and you want to know how I manage 1Hz frequency precision? And you complain of getting a square signal instead of a sin wave?Everything my software does and mostly how it does it, is described in my many blog entries and the user manual of my software.Nowhere do I mention 1Hz frequency precision (in fact the software works with 1kHz input resolution) and I do not control the shape of the signal generator at all. That would be impossible by software.Regards,Vitor

author: markl17@gmail.com
author_rank: Newbie
timestamp: March 14, 2022, 12:11:55 pm
content: First of I thought that your name is vitali or vitay it Russian names and I was under impression that you used max2870 chip that could be reprogrammed to have more precision I guess I was wrong on both counts

author: Bicurico
author_rank: Super Contributor
timestamp: March 14, 2022, 01:28:03 pm
content: No problem.I don't think you can reprogram the MAX2870.Regards,Vitor