Hi Bob, While agree that the APF could use a bit more gain ( I always end up turning up AF Gain once the APF is enabled), I find it leagues ahead of the APF in my ex-7700- which I believe had the same APF as the 7800. I even complained to Icom about its ineffectiveness. At the time I was running the 7700, I also had my Alpha Delta speaker system with its own APF- and there was no contest between the two. I thought perhaps there was a problem with my 7700's APF until I heard from others that also thought it was a useless feature on the 7700.
Dale W4OP ----- Original Message ----- From: "Bob Lanning" <bob.w6...@gmail.com> To: <elecraft@mailman.qth.net> Sent: Tuesday, January 25, 2011 3:11 PM Subject: [Elecraft] APF effectiveness... > APF ringing and over powering... > > I have had input from two Elecraft support fellows one of which was > helpful. That being move the receiver off frequency (RIT) about 10Hz > then adjust the APF center frequency to match. Some help - yes. > > But... > > The Elecraft implementation of APF in MCU 4.22 just before the current > MCU 4.25 needs more work. The APF in the IC-781 from 1988/9 is much > more effective with plenty of gain without ringing. The FT-1000 (early > production only) and IC-7800 APFs are better than the K3's. The Yaesu > MP series I have to admit, is useless. Elecraft either needs to tweak > it for perhaps less gain and a little wider BW or give the user the > tools to do it ourselves. > > I hope the folks at Elecraft will put some attention to this feature. it > can be a powerful tool. > > I still find it amazing that this little 9.5 pound K3 sitting next to my > 52 pound IC-7800 and 51 pound IC-781 is as good and in some cases better > than either of those radios. Also nice is power consumption - listening > on the K3 consumes only 33 watts with an Astron SS-30 while the two > Icom's consume 100 watts each. > > 73, > > Bob - W6OPO > > ______________________________________________________________ > 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 -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.872 / Virus Database: 271.1.1/3402 - Release Date: 01/25/11 02:34:00 ______________________________________________________________ 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
