SEESII Upgraded NanoVNA-H4 Vector Network Analyzer, Latest V4.4 9KHz-1.5GHz HF VHF UHF 4" Touch Screen VNA Antenna Analyzer Measures S Parameters,Voltage Standing Wave Ratio, Phase,Delay, Smith Chart

This works great has saved me a lot of time when it comes to antenna testing it’s a great value for the money. SWR readings are accurate. No issues with connectivity and the build quality is solid would recommend.

This thing is great! It's sooo handy and works like a charm once I learned how to use it. I use it mostly to measure SWR for the antennas I build. It can do so much more though, it's amazing! I got it on sale too for a lot lower price and was super happy about that. Worth the money and helps with many situations. Holds a charge for a good while and doesn't take long to measure an antenna once saved recalls are in it. Easy enough to use for SWR and not too hard to learn other measuring methods. YouTube is your friend. :)

I have read a little on these devices over the past few months, and decided that for ham radio use, if they worked as well as people seemed to think, the small size, internal battery etc. would make it ideal for field antenna work. I really wasn't expecting that much at this price. However, it arrived in a nice looking box with fitted internal compartments for cables, connectors etc. My first quick play with it impressed me. I was suspicious about using a square-wave and using harmonics for the higher ranges, but if you forgive the reduced measurement range, that actually works pretty well. Not as well as my bench VNA, but that cost just a tiny bit more. The biggest potential problem is the number of sample points. Being fixed at 101 points is rather limiting for wide-band scans. That said, its not that usual outside of microwave use that wide bandwidth scans are used/useful. If you really need that, there is software available (free) for Windows and Mac to control the nanoVNA, and with the ability to split the range into some number (you decide - how long you want to wait) of segments, and scan each segment individually, merging the results into a single view. If I had to find fault, it would pretty much be with the external components: * A guitar pick is better than a finger on that little screen, but a stylus would be better. * There is only one 50ohm load, the proper calibration procedure requires two, although you *can* use just one. * The open and short calibration loads are identical once connected or an adapter fitted. Marking these 'O' and 'S' would be useful. * The box is too nice to toss away, but lacks space for additional adapters/connectors. All that said, I highly recommend this for anyone wanting a VNA for sub-microwave use and not requiring ultra-precision. If you have never used this sort of equipment before there is a somewhat steep learning curve, and most documentation is either at too high a level for a lot of people, and assuming lots of basic knowledge, or really too low level and created by people that are maybe not really grasping what they are doing. I expect that problem to resolve fairly quickly. As an antenna analyzer for ham radio use it blows most of those costing 10 or more times as much out of the water, and is useful for other things too (like tuning filters etc.).only using for SWR across multiple bands, but beats the price on buying multiple meters.

Ordered a larger version tmfo more easy read. Works well, but haven't been able to get SD card to work. Have tried multiple formats. For antenna testing be sure to calibrate with the intended cables and groundplane you intend for antenna. Otherwise, you will be introducing variables after calibration that will potentially give inaccurate readings.

Fortunately there are a ton of videos on Youtube to figure out how to use this device. This thing has more capability than I anticipated! Clear quality, the enlarged size really helps with my older vision. Quality of the product is great, feels good! They suggest that I say something about the ease of use...understand that this is a complicated piece of tech. The good thing about it as the larger and most updated version, some of the complication can be taken out. Please look at a bunch of videos on this and learn with it in your hands! Don't hesitate to purchase it. There is a ton of bang for the buck.

You'll have to watch YouTube videos to learn how it functions and how to appreciate its versatility, because the single sheet of instructions is practically worthless. But it has all of the connections/components/attachments for the analyzer that most ham radio operators will generally need. As an Extra class operator this NanoVNA handles most all of the measurements I need for daily ham activities for a fraction of the costs of other equipment.

I bought the nanoVNA in order to tune a new 20-meter dipole antenna that I was installing. The antenna is the Radiowavz 20-DP11 with 1:1 balun. I was able to buy the preassembled antenna for about the same as it would have cost to buy the center insulator/balun and the #14 AWG copper clad steel antenna wire. It is a very well constructed antenna. Anyway - back to the nanaVNA - I got the antenna up about 40 to 50 feet in some big trees in my yard and took the first reading with the nanoVNA. My goal was to tune it for lowest SWR at 14.250 MHertz - the center SSB phone section of the 20-meter band. I built an Excel spreadsheet to calculate frequency vs. antenna leg length with an assumed velocity factor of 0.98. My first reading on the nanoVNA indicated that each leg was about 10-inches too long. I lowered the antenna and reduced each leg by about 8-inches - not by cutting them - but by twisting them back over the leg of the antenna. My second reading on the nanoVNA indicated that I was still about an inch too long so I lowered the antenna and folded back another inch. This time it read spot on with the lowest SWR of 1.28 at exactly 14.250-MHertz. So, lowered the antenna again and cut off several inches, twisted the rest back over the leg, secured with a couple of wire tires and taped it up good. I came back into the shack, fired up the rig and immediately contacted Italy, Bulgaria and Azores with a 59 signal report. I don't have an amplifier and only run 100-watts barefoot but I consistently get signal reports where the the contact is surprised that I'm not running 1000-watts into a beam antenna. The antenna works great across the entire 20-meter phone band and I have been surprised and delighted with the difference that a finely tuned resonant antenna makes vs a compromise antenna like my 160-meter G5RV. The nanoVNA apparently was spot on with helping me find the right length of my antenna. I decided to try this before in vesting in a $300 or $400 antenna analyzer and I'm glad I did. FYI - there is an excellent user manual available for the nanoVNA on the nanoVNA group on the groups.io conference board. 73 - K4IXO

Just got the NanoVNA-H4, and now I'm wondering how I ever worked on antennas without it. The menu's take a little getting used to, but once you learn it, tuning your antennas take just a couple minutes. I tuned a couple Hustler mobile antennas and it was just easy as could be and was able to see the available range of the antenna to match the tuner. Couple notes, make sure you have the male SMA to male 259 adapter and be sure and buy and sd card to save your work. As far as bang for the buck I must say that this little piece of equipment is worth every penny, you will not be disappointed.

Excelente equipo para checar antenas Solo hay que leer muy bien su manual y una vez que lo dominas es fantastico Lo recomiendo comprar

First thing I want to say is that I see a lot of low rating reviews complaining that it lacks instructions. Although true, you can completely disregard the negative reviews which state this. This is not a tool that you pick up and immediately know how to use it after reading a few pages of a manual. A tool like this is designed for people who know what they're looking at and what it is used for. Sure, if you're a beginner it's really hard to make sense of how it works, but there's an abundance of youtube videos and forums to explain this stuff. If the manufacturer needed to make a manual explaining every detail of its inner workings, the price wouldn't be as low as it is as it takes time and resources to make a decent manual. If you know how to run these things, it's an absolute must have if you work with RF on the go. The display on this one is much nicer than the original NanoVNA-H and the hardware is much faster. The RF cables that come with it are also a lot nicer than what came with the original NanoVNA-H. If you have an android device and the app store says the app is too old for your version of android, just do some googling and find the .apk file and manually install it. I got it working with my Samsung S23.

Stylus was missing in the pack!!!

ok funziona e fa quello che deve sono soddisfatto

Just another chinese copy of a great product, works as it should that is why I gave it three stars. Lets see how long it lasts, then, I may give more or even less stars, depending