Tim, I use the "ANF" regularly on 75 meters to block heterodynes and have no issues or distortion and it works extremely well.
I use AGC settings: Nor decay .30 HLDA Nor PLS 004 SLP 007 THR 030 S I use 2.8 8 pole filter and on occasion a 1.8 8 pole filter. I have my PRE amp off and ATT on, generally as the noise floor is around 1-2 S units using my ~ 350' horizontal loop. My inverted V Double Bazooka has a slightly higher noise floor. Again, I see no issues and am using the latest firmware. The notch removes the offending notch, but not the signal itself, of course. I also have a P3. I think the Notch is working very well as currently designed. 73, Bill K9YEQ -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tim Tucker Sent: Friday, May 18, 2012 10:57 AM To: Elecraft Reflector Subject: Re: [Elecraft] K3 - RX audio degradation with ANF ANF is the common use abbreviation for Auto Notch Filter. A lot of rigs use that nomenclature. The K3's ANF on SSB has not worked correctly IMO for several firmware releases. Someone posted a fix a while back that involved resetting back to factory settings, rolling back to a previous firmware, reloading all your settings and then loading the current firmware. That's a lot of work and I was hoping a more elegant fix could be implemented in a firmware update. In my experience, the issue isn't so much extreme distortion on the signal, it's that it doesn't notch the offending signal properly. To reproduce, watch your RX signal with a strong carrier on a waterfall with a computer application like MixW. Turn on the ANF and you'll see that the K3 notches on either side of the offending carrier, but not actually right on the carrier. If you have good ears, you can hear this yourself. The manual notch works fine, of course. I haven't tried the latest beta firmware, so I don't know if this issue has been addressed yet. It needs to be addressed, though. Tim On Fri, May 18, 2012 at 5:35 AM, Gary Gregory <garyvk...@gmail.com> wrote: > *Don, > > your not alone but I guessed it was Auto-Notch Filter..:-) > ______________________________________________________________ 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
