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563inradaud [2011/08/27 21:23] n1eu |
563inradaud [2011/08/27 21:31] n1eu |
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| ==== Omni 6 DSP Bypass Mod ==== | ==== Omni 6 DSP Bypass Mod ==== | ||
| - | To get around the 260hz high pass filtering of the Omni 6 dsp and still provide the needed low pass hiss filtering, I have done the following with great success: tap the Omni 6 audio right at the product detector output (pin 6) through a 1uF cap and bring it external to the Omni 6 via shielded cable (you could also tap the audio after the notch filter) AND feed this audio line into an appropriate low pass filter to remove hiss. I've used all of the following with good results (2 & 3 are preferred due to smoother sound): | + | To get around the 260hz high pass filtering of the Omni 6 dsp and still provide the needed low pass hiss filtering, I have done the following with great success: tap the Omni 6 audio right at the product detector output (pin 6) through a 1uF cap and bring it external to the Omni 6 via shielded cable (you could also tap the audio after the notch filter) AND feed this audio line into an appropriate low pass filter to remove hiss. I've personally tested 1-3 of the below methods with good results (2-4 are preferred due to smoother sound): |
| 1. Timewave DSP-599ZX high Z input B set to 0.0dBV, filtering set for 100-2800hz OR | 1. Timewave DSP-599ZX high Z input B set to 0.0dBV, filtering set for 100-2800hz OR | ||
| 2. Behringer PEQ 2200 analog parametric equalizer set for 85khz lo cut, 2.5khz hi cut, band5 eq -15dB 10khz 1.2 octaves OR | 2. Behringer PEQ 2200 analog parametric equalizer set for 85khz lo cut, 2.5khz hi cut, band5 eq -15dB 10khz 1.2 octaves OR | ||
| 3. 4Khz Low Pass filter circuit designed by Elecraft for use in the K3 | 3. 4Khz Low Pass filter circuit designed by Elecraft for use in the K3 | ||
| + | 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 method 3 is that it can easily be incorporated internal to the Omni6. | ||
