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563inradaud [2011/09/02 15:38] 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 via shielded cable (you could also tap the audio after the notch filter) into an appropriate low pass filter to remove hiss. I've personally tested methods 1-3 below with good results, although I would lean toward 2-4 for smoother analog 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 via shielded cable (you could also tap the audio after the notch filter) into an appropriate low pass filter to remove hiss. Below is a list of some ideas for implementing the low pass filter. I've personally tested methods 1-3 with good results, although I tend to favor analog filtering. |
| 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 OR |
| 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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