The default firmware main function is used for antenna performance measurement. The 50K-300MHz frequency range of the si5351 direct output provides better than 70dB dynamic, The extended 300M-900MHz band provides better than 60dB of dynamics, and the 900M-1.5GHz band is better than 40dB of dynamics.

The improved frequency algorithm can use the odd harmonic extension of si5351 to support the measurement frequency up to 1.5GHz. This Nano VNA is a DIY product that provides perfect vector network measurement capabilities, tiny and handheld, stand-alone with 4-inch LCD display, portable with 1950mAh battery powered or USB powered. It is best to calibrate device for frequency range You will use later.10k-1.5GHz NanoVNA-H4 Hugen 4inch Vector Network Analyzer HF VHF UHF Antenna Analyzer V4.3 with SD Card Slot Remember – after each upgrade run calibration procedure. Message Target 00: Upgrade successful ! means procedure was successful. When message File correctly loaded will display, click Upgrade. Click Choose… and select generated earlier DFU file. Start DfuSe Demo, make sure You have selected STM Device in DFU Mode. Device will run in DFU mode and Windows will detect new device STM Device in DFU Mode and will install driver. From device menu select: CONFIG / ->DFU / RESET AND ENTER DFU. Using USB cable connect NanoVNA-H to computer USB port. Then click Generate…, and save result file in file system. In order to do so click button S19 or Hex…, next choose HEX file from unpacked ZIP archive. Start DFU File Manager to generate DFU file from HEX file.

You can get it from ST: Download and install it. When I write this article most recent version is 0.7.1. You can download it from /ttrftech/NanoVNA/releases. Upgrading firmware in device You own is nothing complicated. With new firmware releases another limitations are removed. NanoVNA is good example what OpenSource project is capable to deliver. Here is real photo what can You see inside of case: All radio sections are shielded, nice soldering. Price does not have impact on quality in that area. With affordable price device has it’s limitations, but it is manufactured well. NanoVNA can be used with desktop application ( nano-saver) or phone with web application. NanoVNA-H – usefull and reasonable priced vector network analyzer.

Nanovna h4