[Elecraft] APF For K3

[Bill W4ZV]

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/elecraft@mailman.qth.net/msg88687.html

73,  Bill

73,  Bill
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