About NanoVNA
NanoVNA is very tiny handheld Vector Network Analyzer (VNA),designed by edy555, it is a very portable but high-performance vector network analyzer. It is standalone with lcd display, portable device with battery.

Edy555 put his software at https://github.com/ttrftech/NanoVNA
View this link to get the original design documentation for edy555.

At first, NanoVNA was designed to work at 50kHz-300MHz. NanoVNA’s mixer SA612A needs 5V power supply to work properly. The battery can’t be driven directly. The original version of NanoVNA needs external USB power supply to work properly.Hugen recreated the NanoVNA based on the schematic of the edy555 and added a DC-DC circuit to allow the NanoVNA to work independently. Hugen tried to extend the measurement frequency using harmonics, allowing the NanoVNA to measure frequencies up to 900MHz. The Hugen version of the hardware and software is available through this link.

You can make or purchase a finished NanoVNA at a low cost. NanoVNA is now the most active vector network analyzer and antenna analyzer project in the community. Usually buying a finished NanoVNA-H is the most convenient way to get NanoVNA.

Edy555 is updating his software, harmonic extensions have been added, usually a well-made NanoVNA can be acquired better than 40dB dynamics at 900MHz , even we can expand to 1.5GHz, but only 20dB dynamics above 900MHz.

Cho45 adds TDR (Time Domain Reflectometer) functionality to the NanoVNA. Time domain measurements are widely required by the community to quickly measure the length of the coaxial cable and determine the cable fault point by calculating the discontinuous impedance.