SeeSii TinySA Ultra+ ZS407 7.3GHz Spectrum Analyzer: 2025 Upgraded 4 Inch HW V0.5.4 100kHz-7.3GHz Handheld Tiny Frequency Analyzer - 2-in-1 RF Signal Generator 100kHz to 900MHz MF/HF/VHF UHF

This review is for the SeeSii TinySA Ultra+ ZS407 7.3GHz Spectrum Analyzer Fist, be aware that there are many of these out there that are not genuine. Seesii is an authorized seller of the Tinysa and that is why I purchased it from Seesii. Go to Tiinysa and check out their info on this before purchasing. The Tinysa ultra is very practical and fun to use for those who are a bit tech savy. I use it to check the frequency of key fobs for cloning , and cable lines coming into apartments and TV antenna signals. Be careful as the input circuitry is delicate and precautions such as attenuators and a DC block are essential so as not to fry your Tinysa if you are checking your ISP's or external antenna signals. This thing is packed with features. Spectrum analyzers used to cost tens of thousands of dollars. They were big and heavy. This is amazing to have a hand held spectrum analyzer you can carry to locations at an affordable price. The ultra with a 4 inch screen is plenty sufficient. The 7.3 ghz is good for future prospects. Seesii support, if you need it, may not get back to your for a couple of days, but they will get back to you and they are extremely good. Highly recommend the Seesii 7.3 ghz spectrum analyzer, as it comes from a first hand seller and they have support if you need it.

I love this device. The built-in self calibration and the big screen make this my favorite new instrument. I also love that you can save all settings as template, so easy to jump back and all markers and trace configurations are ready to make a measurement.

This compares very well to my much more expensive benchtop spectrum analyzer. It is very impressive to get frequency range up to 7.3 GHz for the low price. It is sensitive enough to see lots of radio stations with a tiny antenna. The touch screen interface works well, especially with the "guitar pick" they provide. I do wish they had a 7" screen version.

The ZS-407 is an impressive upgrade and improvement over the previous model (which I owned 2 of). Although advertised to cover the 100kHz-7.3GHz RF spectrum range, I had no problem observing what I believe to be StarLink Space-to-Earth (Downlink) transmissions with the 10.7-12.7 GHz range (see accompanying photo of a portion of this range, a peak hold spectrograph which I ran for a while until it was completely filled out). The noise levels have noticeably been reduced. The battery life seems significantly improved, even with the display brightness set to the default 70%. The touch screen seems more responsive. It seems to work just as well without the tiny antenna attached as it does when attached. I won't elaborate on the all improvements, as the online wiki manual covers it all. Read the manual to learn of them all. While I have some practical use for this device, I'm finding it fun to play with as much as a video game. Instead of hunting enemy solders on a battle field, I'm hunting for their radio transmissions within the RF spectrum, LOL.

Lots of videos on line to learn with.

This is a nice simple basic SA, but the slow sweep speed is a definite limitation, particularly if you are looking for periodic transmissions. I wanted to check some telemetry systems that operated in the 2.4 GHz range, but I didn't know the exact frequency. The rep rate is fairly slow, so the slow sweep of the SA often does not capture the transmission. For things like spectral analysis of transmitters, it is a nice piece.

Awesome

These work well for the most part. The only reason I didn't give it a higher rating is because I bought 3 of them and they all don't work anymore. To be fair, I used these 24-hours a day for a couple weeks where I was saving data to my PC.. I was in an air-conditioned room, but I don't think these were designed for long-term use as I was doing. They probably overheated. However, when they were working I compared them with my much more expensive Spectrum Analyzers and their measurements were consistent with the expensive SA.

Received Zeenko, equally good one..

Cool device that operates up beyond 6ghz (some people claim 10-12ghz but I haven't tried that) Interfaces with PC, Linux or Mac apps for bigger display and extra functionality. Kudos to Erik and the other folks who made this OpenSource gem of a design. Flashed this with latest software and ran self-test. Seems to be legitimate as it's passing. Check out TinySA Wiki for more info about these devices and their fake clones.