Differences
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564ssbdsp [2018/02/16 16:49] n1eu |
564ssbdsp [2018/02/16 16:54] (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. |