Works perfect. Reduce noise and interference
- Adaptive noise filter for SSB and AM. Eliminate heterodynes
- Automatic multiple tone noise filter..- AGC (Automatic Gain Control)..Sharp Speech and CW
- Linear phase FIR filters- 1.8, 2.4 and 3.1 kHz. Bandpass- 100, 200 and 500 Hz. Bandpass
The DSP-9 uses digital signal processing technology to provide optimum filters for random
noise reduction, heterodyne elimination and bandpass filtering. Digital Signal Processing (DSP) technology provides superior performance in reducing QRM and QRN. No other technology can do what DSP can! $20(USA only).

This was marked by the originator on Nov 11, 2009 as being sold.

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