I am offending the 4.4Ghz product that Bicurico has talked of. He might be onto something, that the advertised 6GHz thingy (with that android something) is only a beefed up version of what is already known.
I only wanted to point out, that this 4.4GHz thing is barely usable as a measuring device, it is only a toy for kids. I mean really, I haven't been able to do anything useful with it.
Originally, I have borrowed that from a friend which has bought it from fleabay (but never used it!) so I have had to figure out. Wanted to sweep a simple lowpass filter, but no success, the thing is junk. Both HW and SW wise.
Please let me disagree with you in a friendly way.
The device mentioned by the OP is a different device than the "SMA Simple Spectrum Analyzer 138MHz-4.4GHz" sold on eBay from China at about 50-60 Euro with free shipping.
It is a different design, featuring a different case with additional shielding, an internal battery and a Bluetooth module. It comes with a custom software for Android, which looks quite nice and professional.
The whole package is sold for 399 US$. Personally, I find the price a bit steep when compared to the pure "SMA Simple Spectrum Analyzer 138MHz-4.4GHz" hardware, but if you add taxes, import duties, extra battery, BT module, custome casing, etc., and SOFTWARE and SUPPORT, it might be reasonable - who am I to discuss that.
I just wanted to point out that the OP is NOT buying a real spectrum analyzer. Period. It is a much lower spec device that allows to see the spectrum, but not to carry out calibrated measurements. The guy selling the device is honest and actually says so on his web page! Again, nothing to point out and I do have to give him
for his nice design.
Would I spend 400 US$ on it? No. I purchased a Siglent SSA3021X, which is the most affordable REAL spectrum analyzer, with the best price/performance ratio on the market (if you can live with 9kHz to 2.1Ghz or 3.2GHz if hacked). But this doesn't make it a "toy" or "garbage".
Now to the "SMA Simple Spectrum Analyzer 138MHz-4.4GHz".
You are 100% correct when you say it doesn't work when you try to use the "tracking generator" and the included software, though it is a pretty good software, it simply wasn't designed for this device! Why? Because this device is a cut down version of a clone of a clone of a clone of the original device for which this software was made in the first place. The original NWT series featured a working tracking generator, software switchable attenuators, etc.!
On top of it, the Chinese sellers on eBay just include this freeware/shareware without any consent of the original author, who is really fed up getting complaints or questions by mislead customers, which he has nothing to do with.
But the question is: is the "SMA Simple Spectrum Analyzer 138MHz-4.4GHz" just garbage?
No it isn't! After my first disappointment, I went on and wrote my own software for it. And though people might find it silly or useless, it does work for me and guess what: it does EXACTLY what I wanted in the first place: it shows me the spectrum from 138MHz up to 4.4GHz, it can render a waterfall diagram and has other features, too. You are invited to try my software FOR FREE.
No offense, but I think the "6 GHz portable spectrum" is ledgit, in my opinion slightly overpriced and peope should not have too high expectations.
The "SMA Simple Spectrum Analyzer 138MHz-4.4GHz" is a very cheap device, great for introduction into spectrum analyzers and can actually be used to VISUALIZE (not accuratly measure) the spectrum, i.e. for CATV or SAT monitoring.
Hope this clarified things a little.
Hera are my links again, as they probably were ignored despite the fact that they show what is possible with this class of devices:
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http://vma-satellite.blogspot.pt/-
https://www.eevblog.com/forum/testgear/presenting-my-new-software-for-the-sma-spectrum-analyzer-138mhz-4-4ghz/msg1015544/#msg1015544Regards,
Vitor