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563ssbaud [2011/11/20 15:18]
n1eu [Omni 6 DSP Bypass Mod]
563ssbaud [2012/12/10 19:46]
n1eu [Omni 6 DSP Bypass Mod]
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 ==== Omni 6 DSP Bypass Mod ==== ==== Omni 6 DSP Bypass Mod ====
  
-The key to getting good sounding receive audio on the Omni 6 is to bypass the dsp.  I routinely bypass both the dsp and the notch filter. ​ However, you need to add some low pass filtering if you do this or the audio will contain an inordinate amount of hiss.  Tap the product detector output (U3 pin 6) through a 1uF cap and then apply low pass filtering. ​ I've done this both inside the Omni 6 (with homebrew 3Khz low pass filter) and outside the Omni 6 (with DSP-599ZX or Behringer equalizers). ​ Inside the Omni 6, you can then send the output of the low pass filter to the AF Gain control and then to the audio amp by splicing into connector 55.  This way, you can leave the dsp sidetone circuit intact. ​ The result is a TOTAL transformation of the Omni 6 receive audio.+The key to getting good sounding ​ssb receive audio on the Omni 6 is to bypass the dsp.  I routinely bypass both the dsp and the notch filter. ​ However, you need to add some low pass filtering if you do this or the audio will contain an inordinate amount of hiss.  Tap the product detector output (U3 pin 6) through a 1uF cap and then apply low pass filtering. ​ I've done this both inside the Omni 6 (with homebrew 3Khz low pass filter) and outside the Omni 6 (with DSP-599ZX or Behringer equalizers). ​ Inside the Omni 6, you can then send the output of the low pass filter to the AF Gain control and then to the audio amp by splicing into connector 55.  This way, you can leave the dsp sidetone circuit intact. ​ The result is a TOTAL transformation of the Omni 6 ssb receive audio.
  
 A side benefit of this filtering technique is that all the digital "​grunge",​ encoder noise, and other annoying artifacts are totally removed from the rx audio.  ​ A side benefit of this filtering technique is that all the digital "​grunge",​ encoder noise, and other annoying artifacts are totally removed from the rx audio.  ​

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