The NanoVNA is a tiny, self contained, portable, but low cost Vector Network Analyzer. It features a touch screen and built in lithium rechargeable battery.
|NanoVNA with included accessories (minus SMA to UHF adapter).|
Of interest to the radio operator is being able to measure reflected power and calculate the Standing Wave Ratio (SWR) over a frequency range. The NanoVNA automates this resulting in an easy-to-interpret graphical summary of antenna radiation efficiency vs. frequency.
|Hooked up to the Firestik 2MCKB 2m antenna. |
|Triangle "1" at 143.400 MHz showing 1.05 SWR. Should work well on the 2m band 144-148 MHz.|
This information is crucial for effective antenna building or diagnosing and many antennas can be adjusted to improve SWR around a desired frequency.