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« on: June 26, 2017, 1751 UTC »
As to audio dsp systems, they can take a sig in the mud you can't hear and make it mostly understandable, but don't expect much more than that. I've had the Heil and timewave, the Heil did really well at cleaning up the white Gaussian background noise on hf if set to a lower level, it impressed me the most out of the audio systems I've used. I've had dsp in several HAM rigs and dsp noise reduction still hasn't got to the earthshaking level yet, however dsp demodulation and filtering is pretty earthshaking. Other than that it was often a hindrance to otherwise clean signals. Another thing is they might offer a auto notch that really can come in handy at times if your rig doesn't have a notch built in. also hardware audio filters can be of help, the elliptical lowpass audio filter is a fav for swling but I don't have a link to a design handy.
On the folder dipoles, one thing to keep in mind is they don't accept energy at twice their resonance and even harmonics, so they do a good job at filtering the 2nd harmonic if you tx with one. I've often wondered how a off center fed folded dipole (OCFFD) would fare, perhaps a low noise yet multibanded antennae would result.