[Elecraft] APF For K3: progress report

[Paul Christensen]

Wayne,

I like the idea of engaging APF independent of DSP or roofing bandwidth. 
There are times on an open band where APF can be effective without the need 
to mitigate interference through the use of roofing filters, thereby 
minimizing through-loss.

A long press of Dual PB or use of 'Notch' in CW as W4TV points out seem like 
reasonable methods to engage the APF feature.

Paul, W9AC


----- Original Message ----- 
From: "Wayne Burdick" <n6kr at elecraft.com>
To: "Joe Subich, W4TV" <lists at subich.com>
Cc: <elecraft at mailman.qth.net>
Sent: Monday, October 25, 2010 4:30 PM
Subject: Re: [Elecraft] APF For K3: progress report


> 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
>
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