I have always wanted A good analyzer for HF up to VHF (2m)
In the past I have build many Antenna Analyzers started with:
VK5JST Antenna Analyzer
Toghether with Jarek SP2SWJ we have built the BIGVNA MAX5 & MAX3
Big VNA Max 5
This analyzer is based on the:
STM32F746NG Discovery (disco) development board.
The development board is available from Farnell, Mouser, RS-Online etc..
The project is quite easy to build. The only thing you have to build yourself.. if you want to go for the lowest costs is the the frontend PCB.
The specs of the analyzer are amazing, the frequency range runs from 100KHz > 600MHz!!!
You can also look on Ebay, there are lot of listings of these pcb’s even pre-assembled.
In the mean time I made several of these Analyzers with great succes!