AURSINC Upgraded 4.0 Inch TinySA Ultra Spectrum Analyzer, HW V0.4.5.1 100kHz-5.3GHz Handheld Frequency Analyzer with 32Gb Card, 2-in-1 Signal Generator 100kHz to 800MHz MF/HF/VHF UHF Input: Amazon.com: Industrial & Scientific

updated from v1.4-109 to v1.4-165 and never came back on. Followed instructions to reset it by shorting VDD to BOOT0 on power up on the PCB and still did not work.Update: Finally found tip that the STM Cube Programmer latest version 2.16 did not work. Used version 2.15 and now works.

Excellent price for high-quality highly capable device. Other reviewer‘s cover all of the pros, and only slight complaint I have is the 10db 25 W attenuator was not labeled. Would also be nice if calibration connectors were included. After conversion of Chinese characters and much research, I believe I found the specs for this device. See attached photos.Photos show product as received. While the box it arrived in provides good cushioning, I’ve switched to a pelican case for added travel and moisture protection, see photos. Because the device does not come with calibration connectors, I’ve also added a calibration kit and other adapters to make life easier to use it and to protect the SMA connectors on the device. After careful examination with a magnifying glass the 6db attenuator label can be seen.Although the price has increased $50 since July it is still an excellent product and a bargain.

Seems to be working pretty good so far. No manual other than the Tiny SA Wiki as far as I can see. Luckily I’m familiar with spectrum analyzers. A good resource is Kerry Wong on YouTube. Good luck.

I enjoy the big screen and ease of use. If you're already familiar with the NanoVNA then you'll likely find it easy to navigate this analyzer. Still getting used to all that it can do, but the one thing I quickly noticed, it does take a fair amount of time to scan frequencies looking for harmonics. I'll do an update once I get more time under my belt with this.

However this is a device for persons with some expertise in radio signals. Also unlike spectrum analyzers at 500 times the cost, this hasn't the knobs and buttons of an expensive model. Navigating the touch screen menu takes some patience but it is thoughtfully designed. The TinySA web page describes the device thoroughly. Pleasant surprises: Audio jack to listen to AM / FM stations. SD Card to save settings, traces and screen shots, a huge range of trace and analytic functions. Finally I don't know what happened but this arrived from Amazon in 12 hours. That's not a typo. 12 hours. Gadgets of this type can take weeks or even months - 12 hours is positively supersonic.