[Elecraft] Antenna Analyzer (FA-VA4)
Ignacy
no9e at arrl.net
Fri Dec 1 11:16:53 EST 2017
The choice of analyzers is not that simple unless cheap price is the only
factor.
I have four analyzers: Rigexpert 230Pro, FA-VA4, VNWA3 and Mini60.
Rigexpert covers up to 230 MHz and costs about $500. It is the easiest to
use and has the most functionality. Less accurate because it does not have
OLS calibration and is pretty big, but new models (Zoom) have calibration
and are much lighter. Seems rain resistant. Coax testing for short and
length is a blessing. I use it most of the time.
VNWA3 covers > 1300 MHz and costs about $600 but needs a computer. Often
requires multiple calibrations requiring an hr. Has two port for filters and
beam testing. I use it only when nothing else works.
FA-VA4 works up to 100 MHz and is very accurate after good calibration
(included 50 Ohm load is not too good). Light but not the smallest. Getting
things done takes many buttons. Not waterproof. Also. soldering is tricky
and I wonder whether bad soldering will show up one time. I use FA-VA4 for
portable measurements where accuracy is important. For instance impedance of
inv L on 160m. Measure impedance, prepare appropriate coil, and no extra
fine tuning needed. Also very useful to measure properties of toroids across
frequency.
I also have mini60 that works up to 60 MHz, is very small, can be charged
via USB, and interfaces with Android phone, and costs $100. SWR accuracy is
good but X is not. I leave it for travel.
--
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