[Elecraft] APF For K3: progress report

[Wayne Burdick]

Joe,

We're still experimenting with both the UI and the underlying filter  
function. I jumped the gun a bit in my proposed use of the WIDTH  
control to activate APF, and we're looking at other ways to do that so  
that the width can still be set independently.

One possibility is to overload the DUAL PB control (say, a long hold  
of DUAL PB turns on APF, or the DUAL PB control has three settings).  
When APF is selected, the SHIFT control could adjust the APF center  
frequency, leaving the rig's normal passband unshifted.

More later--

Wayne