The miniVNA: Miniature, PC based HF/VHF Antenna analyser from 0.1-180 MHz
The miniVNA is a tiny antenna analyser working from 0.1 to 180MHz. It is connected to a computer with just one USB cable, power is supplied over USB. An internal option for serial (RS-232) communications is available as well. The miniVNA allows you to quickly analyse any antenna over a user defined frequency range between 0.1 and 180MHz. You see at a glance where the antenna is resonant, what the SWR is and what the return loss is. The best (minimal) SWR frequency is automatically found and displayed. Two markers can be freely placed within the shown frequency range and measure impedance [Z], resistance [R], phase [?] and other values at these points. Other functions of the mniVNA allows you to measure cable losses, cable length, transmission, bandwidth and quality of filters etc.
some helpful links for the VNA
MiniVNA Home
MINIVNA F4CLB new graphic interfacing
vna/J by DL2SBA
Zplot for VNA
Sweep for VNA
eHamnet Preview
Measuring a Kelemen DP-80/40/20/15/10 Dipol
Measuring a Diamond DIAMOND VX – 1000 on 6m + 2m
Measuring the gain of a 2m PreAmp by SSB Elektronik with a MGF 1302 insert of a 23 dB step attenuator (measured before 1dB insert loss so offset -1dB)gain of the MFG 1302 is 18.3 dB
Measuring the gain of a 2m PreAmp by SHF Elektronik with a BF981 insert of a 23 dB step attenuator (measured before 1dB insert loss so offset -1dB) gain of the BF981 is “surprising” 20.5 dB
For those measurements I have used a step attenuator
