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563inradaud [2011/08/27 21:31] n1eu [Omni 6 DSP Bypass Mod] |
563inradaud [2011/08/27 21:34] n1eu [Omni 6 DSP Bypass Mod] |
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| 4. Low Pass filter circuit (fig. 3.50) from Experimental Methods in RF Design, with each capacitor value scaled down by 50% | 4. Low Pass filter circuit (fig. 3.50) from Experimental Methods in RF Design, with each capacitor value scaled down by 50% | ||
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| - | The advantage to filter method 3 is that it can easily be incorporated internal to the Omni6. | + | The advantage to filter methods 3 & 4 is that they can easily be incorporated internal to the Omni6. |
| 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. | ||
| - | The existing audio chain is left intact as well, in case you ever want to listen through the Omni 6 headphone jack or speaker. Another option for the experimenter is to re-inject the externally filtered audio back into the Omni 6 which would be easily accomplished via the DSP return connector 54/56 on the IF/AF board. | + | The existing audio chain can be left intact as well, in case you ever want to listen through the Omni 6 headphone jack or speaker. Another option for the experimenter is to re-inject the externally filtered audio back into the Omni 6 which would be easily accomplished via the DSP return connector 54/56 on the IF/AF board. |
| Coupling the dsp bypass mod with installing dual Inrad 2.8khz filters will transform the Omni 6 ssb rx audio from mediocre to superb. Although rx audio is the topic at hand, you may want to consider feeding the tx audio directly into the Omni 6 balanced modulator (U4-5 on TX Audio board) via a 1uF capacitor if you are already using an external mic preamp and can adjust its output to a fairly low level. | Coupling the dsp bypass mod with installing dual Inrad 2.8khz filters will transform the Omni 6 ssb rx audio from mediocre to superb. Although rx audio is the topic at hand, you may want to consider feeding the tx audio directly into the Omni 6 balanced modulator (U4-5 on TX Audio board) via a 1uF capacitor if you are already using an external mic preamp and can adjust its output to a fairly low level. | ||
