Note that NR is not available in DATA A mode -- K3 manual p25: "NR turns noise reduction on. It doesn’t apply to DATA or FM modes, or with AGC turned off."
Ray identified why I would like the K3 NR to work in DATA A when he said, "NR algorithms -need- a broad "chunk" of spectrum". If the DSP NR could work on a broad spectrum before filtering it would have enough data to separate signal from noise. I'm not trying to get NR to deal with strong nearby signals, but when I narrow the bandwidth to get rid of them, my post-narrowing NR no longer works so I'm looking for pre-narrowing NR. I have used the notch filter, but it takes time to deploy, and can't deal with two separate loud signals. By experience, narrowing the DSP bandwidth is operationally easier and more effective. I suppose I should bite the bullet and get a 24 bit USB "sound card". Does anyone have any recommendations? [It hurts to spend money for a 24 bit A/D converter which is going to convert analog the radio has produced using a 24 bit D/A converter. It's just unaesthetic.] Cheers - Bill, AE6JV On 7/20/12 at 10:43, li...@n5ge.com (N5GE) wrote: >Have you tried using a narrower filter in the K3 or using the K3 NR? On 7/20/12 at 11:11, raysil...@verizon.net (Ray Sills) wrote: >Well, the way I see it.... Noise Reduction won't help you get >rid of strong nearby (in frequency and/or QTH) signals. That >would be the job of a notch filter. In fact, I think NR >algorithms -need- a broad "chunk" of spectrum, so as to be able >to identify what is "signal" and what is "noise". If you >narrow the DSP bandwidth, the software many not have enough >noise to work with. > >If those strong signals are overloading the A/D converter, you >would be better off lowering the level fed to the converter. I >think the SignaLink uses a 16 bit converter, and this is where >a 24 bit converter would work much better, since it has 24 dB >more dynamic range (before clipping). ----------------------------------------------------------------------- Bill Frantz | "The only thing we have to | Periwinkle (408)356-8506 | fear is fear itself." - FDR | 16345 Englewood Ave www.pwpconsult.com | Inaugural address, 3/4/1933 | Los Gatos, CA 95032 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
