Interesting. For CW I always use the NR to dig out the weak ones. The effect is amazing. I believe the reason we all see this differently is due to AGC settings. THR, SLP etc. really affect the NR. Steve Ellington [email protected] ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: "Joe Planisky" <[email protected]> Cc: <[email protected]> Sent: Saturday, April 25, 2009 5:14 PM Subject: Re: [Elecraft] k3 NR Audio level increase
> Joe, > > I tried your suggested settings, and yes I found an increase in audio > volume. I also observed that the NR worked as a squelch at that > aggressive setting. I normally use F1-3 or F1-4 for NR and have no > problem. > > I don't use NR when attempting to copy a weak signal. When the weak > signal is down in the noise level, the NR algorithm cannot distinguish > between the noise and the signal with certainty. My ears do a better > job despite the noise, so I turn NR off when digging for the weak ones. > > 73, > Don W3FPR > > Joe Planisky wrote: >> Don, >> >> Try this: >> >> 1. Set mode to CW, BW to 2.00, RX EQ = flat. >> >> 2. With no signal tuned in, hold NR and set to F4-4. Tap NR twice to >> turn off NR. >> >> 3. Tune in an S9 signal, or better yet, use a signal generator (I use >> an XG2). >> >> 4. Set RF gain to max, AF gain for a comfortable volume. >> >> 5. Tap NR to turn on noise reduction. (You might want to keep one hand >> on the AF gain control :-) >> >> On my K3 (with FW 3.11), turning on NR under these conditions boosts >> the audio output voltage by 17.2 dB according to the built-in AFV meter. >> >> Using less aggressive NR parameters results in less of a boost, down >> to 6.3 dB at F1-1. >> >> Now tune in a weak signal (say, S3) and repeat the steps. The boost >> is still there, but very much reduced (On my rig at S3 and NR=F4-4, >> the boost is 6.3 dB, at NR=F1-1 it's 1.4 dB) >> >> Now imagine trying to copy a signal that rapidly fades between S3 and >> S9 with NR on. >> >> 73 >> -- >> Joe KB8AP >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
