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564ssbdsp [2018/02/16 11:49]
n1eu
564ssbdsp [2018/02/16 11:54] (current)
n1eu
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   * Run pre-DSP audio through 3KHz low pass filter for ssb (no DSP is used in ssb receive)   * Run pre-DSP audio through 3KHz low pass filter for ssb (no DSP is used in ssb receive)
   * Run post-DSP audio through 1KHz low pass filter for cw   * Run post-DSP audio through 1KHz low pass filter for cw
-  * Switch between the pre-DSP filtered ssb receive audio and the post-DSP filtered cw receive audio via a relay triggered by the ssb or cw mode signal and send the output audio signal back to IF/AF board J56+  * Switch between the pre-DSP filtered ssb receive audio and the post-DSP filtered cw receive audio via a relay triggered by the ssb or cw mode signal ​(available on control board) ​and send the output audio signal back to IF/AF board J56
  
 There was an unforseen benefit realized by the dsp bypass. The stock Omni 6 has a high amount of low-level, clearly audible, digital "​grundge"​ in the rx audio - various tones/​buzzes/​encoder tuning ("​zipper"​) noise, etc - and these were totally removed. There was an unforseen benefit realized by the dsp bypass. The stock Omni 6 has a high amount of low-level, clearly audible, digital "​grundge"​ in the rx audio - various tones/​buzzes/​encoder tuning ("​zipper"​) noise, etc - and these were totally removed.
-Omni VI+ SSB RX Audio Spectra Compared - Before and after DSP Bypass Mod 
-o6spectra_text.jpg 
  
-Coupling the dsp bypass mod with installing dual Inrad 2.8khz filters (and carefully aligning BFO oscillators and carrier null) will transform the Omni 6 ssb rx audio and remove all the frustrating grundge from the Omni 6 cw rx audio. ​Following is a short clip of the resulting rx audio, fed from my Omni 6+ headphone jack into my soundcard. This is with BFO oscillators aligned per factory spec. +Coupling the dsp bypass mod with installing dual Inrad 2.8khz filters (and carefully aligning BFO oscillators and carrier null) will transform the Omni 6 ssb rx audio and remove all the frustrating grundge from the Omni 6 cw rx audio. ​
- +
-Click here to play a sound clip of W3OZ and KA7GKN through the dsp-bypassed Omni 6 rx+
  
 The Corsair II is actually a much easier radio to modify for exceptional audio over the Omni 6. The need to selectively bypass the dsp in the Omni 6 makes it an unusually difficult job. But the CAT port in the Omni 6 is an undeniably huge advantage. The Corsair II is actually a much easier radio to modify for exceptional audio over the Omni 6. The need to selectively bypass the dsp in the Omni 6 makes it an unusually difficult job. But the CAT port in the Omni 6 is an undeniably huge advantage.

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