SeeSii TinySA Ultra+ ZS406 Spectrum Analyzer, 4.0 Inch 100kHz to 5.4GHz Handheld Tiny Frequency Analyzer with 32Gb Card, 2-in-1 Signal Generator MF/HF/VHF UHF Input,V0.4.6.1,2025 Upgraded

Works properly and as expected. Was able to use it to analyze signals from wifi, car key fobs, and vco output well. Does the job of a spectrum analyzer without having to pay thousands for a professional one.

We used this SA to diagnose and correct interference from TV stations that was interfering with a wireless mic system. By seeing where the interference was, we were able to move our wireless channels around the problem areas. It works well in the handheld mode (easy to control the touch screen with the included stylus) and even better when connected through the PC app. The controls (frequency range, RBW, VBW) are straightforward and produce scans that compare with much more expensive SA's. The only problem we ran into was with the PC app: After changing a setting such as frequency or RBW/VBW we sometimes needed to restart the scan or power-cycle the SA to reconnect the USB port. Otherwise, though it works great and is a great value for the cost.

I bought this to keep in my laptop bag for quick frequency scans at broadcast sites. I am surprised it works so well! In one instance, I used it to investigate interference to the LTE cellular band (720MHz), and was able to not only identify the source, but also confirm corrective actions were successful. I upgraded the software to allow for use past 1GHz and was able to clearly view an L-band signal out of a satellite LNB (~1100MHz).The screen is small and navigating the menus is a little awkward at times using the included pencil, but it's fine in most cases. And remember this is not a $15k analyzer, so the VBW, RBW and sweep times are not going to compete with one that is priced 1000x more. But for something that is small enough to fit in your hand, runs on batteries (for quite a while, honestly), and does a good enough job for most simple tasks, you can't beat it.Don't forget to buy a few SMA adapters, too.

This is a very good, low cost spectrum analyzer to test the RF output of my handheld ham radios.

I love this device. Sole people say they are too small. But they must have gotten the smaller version. It does more than I know how to do. I use mostly to test antenna SWR and it works great for that. I wish I knew more about the other functions as I know it can do a ton of stuff.It’s great to run a wide sweep of an antenna.It actually helped me finally determine a mobile antenna was bad. Not that mount as I previously thought.

So, you have your VNA to have your antennas and filters tuned and ready to go, the Tiny SA is the next tool for your workbench.With the included 25-watt attenuator, you can measure the RF performance of your handi-talkie. If you dial-down the output of your mobile or base rig or add a larger attenuator, you can do the same.Have RF noise in your home or shack from a wall-wart or LED light, plug in the included whip antenna and go on a fox hunt for noise.This is a great tool for the shack and workbench for the intermediate technical person.This unit is everything I expected with sufficient cables and accessories to get started.Battery life is good.The app is good as well.Spend some time with the SA and the app. It's worth it. This is a great device for the $$I RECOMMEND!

I'm honestly unsure on this device. I kind of want to return it. It wasn't quite the quality I expected. Particularly in the screen. It uses a pressure screen rather than a touch screen which makes it extremely hard to tap things. Even with the pen. I did the drawing pad just to test and boy it was just awful, drawing lines to areas I wasn't even touching, thinking it was still connected when I let go and touched somewhere else, skipping entire segments as if I let go when I didn't. Its no wonder I keep tapping the wrong menu items all the time and it keeps glitching when I try to tap things. Its extremely hard to drag the marker around when I need to.I was also kind of annoyed I had to go and buy an antenna just to use its full range. I kind of expected it to come with one for the non-discount price but, I guess whatever.As per the software parts, I tried connecting with my PC and turns out, you can't access the SD card through USB, which kinda sucks. It also seems that the tools they recommend on their website don't work. They connect to the device, but they won't actually do anything other than that, no graph no waterfall no scanning nothing. They just sit there. I had hoped to use a tool to import the presets I already put into the device and I just couldn't get the tool to even do anything whatsoever once it established connection. (WinSpectrumIII)More on the software, there seems to be no option to stop it from clearing the waterfall every time you open and close a menu. Which makes using the internal screenshot tool useless because every screenshot clears the waterfall before it takes the screenshot. I was up on the roof pointing this thing in different directions and using screenshots because it was too bright to see the screen fully so I could examine indoors. Five minutes between each to let the waterfall fill with long scan time. I'll attach the results here and you can see what I mean... (P.S. Might be nice if you could change battery from voltage to percentage)I don't know a ton about radio stuff, I used Google's AI Gemini to help me set the device up and find the network signals I needed to. Its kinda nice that Google's AI knows a lot about it and was extremely helpful. The guide on the other hand being online only, wasn't so much. In fact its got some pictures on it that require a password to access, which was like, wtf? Its kind of annoying there also wasn't a basic guide that came with the device to explain anything and that they hide the Ultra mode behind a code thats only available online. Tell me, what do you do if you get one of these devices and your site is down for whatever reason? Maybe even permanently? The users are just screwed in that case? Include a warning when unlocking, rather than locking it with a password. The user should have to click "I understand and have read your warning" before using it.I really hate online only lock outs. I understand your reasoning for wanting people to first use the guide to understand what they're getting into but the danger in that is that one day, the access may disappear. Which is also why the guide shouldn't be online only too. Its just good that the AI I spoke of knew a lot about it already and could help me with 100% of what I needed.I did have -some- trouble with it, trying to do what the AI suggested where it would say things like Reduced Linearity when I disabled LNA and increased the ATT to max 30dB, no matter what I did there it seemed like it just couldn't get rid of that red message even when I got further from the source. Again I am no radio expert, I was just testing on Wifi first so I could learn how to control it before I tried using it to find T-Mobile's towers and stuff. I'm sure there's an expert's opinion on this particular thing and I'm sure I may have just been doing things wrong on this particular part. Who knows though.My review here merely reflects the software issues I had (screenshot, waterfall reset, PC control, No SD access) and the bad screen type as well as the guide and lockout. Frankly, I'm wondering about returning it. I have to decide over the next week or so. It is handy, I'll say that for sure. Not something I'd use often but it was helpful to a point but the biggest thing is this screen, boy is it hard to control when you tap the wrong thing all the time.