I have a fairly tired, used, Realistic DX-398. Sensitivity is fine for noise
sniffing. S meter is highly nonlinear but after testing it I know how to
interpret it (you should check the one on the Tecsuns and see how they work,
too…). Antenna is a very cheap and simple resonant loop with very high
transducer gain, excellent directionality, and requires no power :-) This rig
has served me well in RFI hunts at many QTHs.
http://wb9jps.com/Gary_Johnson/RFI_files/Handheld_DF_Antenna.pdf
As for portable spectrum analyzers, sensitivity is really important unless you
want to spend all your time looking at very slow scans with narrow RBW.
Requires a preamp unless the RFI is outrageously loud. That’s one reason that
folks have been using tiny SDRs and laptops. Also a wideband antenna is more
much useful than a narrowband one like mine. The KQ6RS antenna would make a
good companion, I think.
-Gary NA6O
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