(Neurotech) wrote in
om:

Of the R-75, Radio Netherlands has this to say.

http://www.rnw.nl/realradio/icr75.html

"Digital signal processing (DSP) is available with the optional UT-106
DSP unit (US$140). The more expensive receivers like the Kneisner &
Doering KWZ-30 and the Japan Radio Company NRD-545 have the DSP circuitry
built into the IF stages, a theoretically effective methodology when
combating difficult reception conditions. The IC-R75 has DSP functioning
in the audio stage, and adds an auto notch function (ANF) (removing
stable or moving heterodynes) too. Press and hold the NR button for two
seconds enables the tuning knob to set the DSP level; we found a setting
of 3 or 4 (out of 16) to be best in the majority of cases. In our
opinion, there is no need to purchase an after-market external DSP unit
(c.f. "Digital Signal Processing... and a look at two market leaders of
post-receiver processing units", World Radio TV Handbook, 1997 edition).

Although the manual clearly states the DSP and ANF functions work only in
the SSB mode, we note instances on weaker signals where the noise
reduction works to some degree in the AM mode".


http://www.rnw.nl/realradio/html/dsp.html

Regards


I have owned an R75 for about a year and am ready to upgrade. Does
the DSP make a big difference, or should I invest in a new filter.

Thanks