Available software doesn’t appear to have an option to eliminate interference from the strong signals likely to be present at a broadcast antenna site. The maximum output power is around –9 dBm for the NanoVNA and –6 dBm for the miniVNA. Since the NanoVNA includes a display, a computer and software isn’t required, but will provide additional measurement options (like TDR) and segmented sweeps (for greater resolution) and the ability to save parameter data in standard format (s1p, s2p) and plot graphs.īefore you get too excited about these low-cost VNAs, there are some significant limitations. It works with both the 2.8-inch and 4.3-inch versions of the NanoVNA. exe) for Windows and a simple installer script for Linux. The program is Python-based and available as a binary file (currently nanovna-saverv0.2.0. In addition to the measurements available in the miniVNA’s software, nanovna-saver also includes an X-Y TDR display that can show discontinuities in the middle of a cable as well as cable length. The 4.3-inch NanoVNA, along with the nanovna-saver software ( ) is what I used in this article. The price is around $125, direct from China. Search eBay for “NanoVNA VNA HF VHF UHF Vector Network Antenna Analyzer + 4.3 LCD + Metal Case” to see the offerings. This unit has a 4.3-inch LCD display, full metal case, and claims a 1 GHz upper frequency limit. While searching for a case I found an improved version of the NanoVNA on eBay. Amazon prices have gone up due to tariffs, but most are still under $75. Based on reviews I’ve seen online, the cheap units that have a replica of the Copper Mountain lizard logo on them are the worst. Some units don’t even shield the RF components, and while most come in a plastic box with the calibration kit and cables, the VNA itself is just a stack of the metal back plate, circuit board and LCD with the sides open. These VNAs use an open source hardware design and quality varies greatly. I bought one for $53 from Amazon (shipped from China). The original units have a 2.8-inch LCD screen and are about 54x85.5x11mm in size. While searching for software for the miniVNA I came across the NanoVNA analyzer (Fig. 1: Test setup used to measure a Channel Master LTE filter see Fig.
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