The problem with using a filter ahead of your "wideband" MFJ-259 analyzer is
that the filter will transform the impedance of the load you're trying to
You have a better chance of measuring the impedance in the presence of a strong
signal. with a "narrorband" vector network analyer such as the N2PKVNA (kit) or
If you do need a filter both units enable you do perform a "OSL" calibration
with open, shorted and 50 ohm load calibration with a filter inserted in front
of the input.
In general, I find my MFJ-260 unit handy in determing the lowesr SWR but I
doubt it's accuracy when the load deviates to far from 50 ohms.
If you want accurate readings I'd take a look at the N2PKVNA:
Here is a good write up on analyzer accuracy:
> Has anyone made an effective AM broadcast filter (HB) for their analyzer?
> I have to feel that my lack of readings on the unipole may stem from AM
> I have a station here in town, or close on 1400khz.
> Glen K4KV
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