Re: APF For K3

Posted by Bill W4ZV on Oct 24, 2010; 8:33pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5668599.html

Roy Morris-6 wrote

I used APF in the past on CW contacts when needed.  This feature seems to have been lost on some of todays modern radios.  Because I haven't pounded the brass as much as I used to, I had forgotten about this wonderful APF feature.  Those of us who have used it on CW know how really great this feature is.  Weak CW signals that are unreadable are enhanced with APF making some QRP contacts possible that otherwise wouldn't be heard.  Wayne has said he is putting this feature on the K3 list.  I am thrilled that Elecraft is considering this feature.  I am looking forward to having APF on my K3s.

APF was discussed extensively in August 2009 (check the archives) including a simulation of the exact FT-1000D APF circuit I sent to Al W6LX.  It has always been "on the list" but Wayne has now made no less than 3 promises on the Yahoo Groups K3 list in the past few days that "we're working on it".   Maybe something will actually come to pass this time!

In the meantime:

W6LX's simulation (PowerPoint with several graphs):
http://sites.google.com/site/ft1000apf/w6lxanalysisoftheapfcircuitintheft-1000

How to emulate APF in the K3 if you have a 200 Hz filter:
http://www.mail-archive.com/[e-mail]/msg88687.html

73,  Bill

73,  Bill