One thing I've learned about using the APF is to keep the AF gain low. My theory is: The ringing caused by the narrow filter is slightly weaker than the desired tone. Reducing the audio gain tends to demphasize the unwanted effects. So when you first turn on APF and you think YUK, this is horrible....Try backing down the AF gain just to the point that you hear the desired tone and not the other junk. 73
Steve N4LQ ----- Original Message ----- From: "Sam Morgan" <k5oai....@gmail.com> To: "k5nu" <k...@ainternet.biz>; <elecraft@mailman.qth.net> Sent: Tuesday, December 07, 2010 3:30 PM Subject: Re: [Elecraft] APF > sorry to fast on the trigger > in my pea brain I had transposed the > "apf quite uneffective with the NR on" > into 'NR was quite ineffective on cw' > > my bad > > GB & 73 > K5OAI > Sam Morgan > > On 12/7/2010 2:26 PM, Sam Morgan wrote: >> I remember seeing it said that, using the NR was useless when you were >> using >> narrow cw filters >> >> 6) NR is rarely useful if the bandwidth is narrow. If you set your CW >> width >> to 400 Hz or less, for example, there is no point in running NR *unless* >> you >> want to use it as a sort-of "smart squelch." >> http://www.elecraft.com/K3/Lyle%20Johnson%20explains%20Noise%20Reduction.htm >> >> GB & 73 K5OAI Sam Morgan >> >> On 12/7/2010 2:18 PM, k5nu wrote: >>> Fellow Elecrafters, >>> >>> Many of you have praised the current version of apf. Since I spend 99% >>> or >>> more of my time listening for weak signals on 80m, it should be a very >>> useful adjunct. How do you utilize the apf - with NR on or off? My >>> particular preference for listening keeps the NR on - never off. I use >>> 1-3 >>> or 1-4 on cw and find the apf quite uneffective with the NR on. >>> > ______________________________________________________________ > 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 ______________________________________________________________ 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
