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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
