[Elecraft] K3 Audio Peaking Filter

[Wayne Burdick]

We just added dual-passband APF to the K4. It's very effective at higher code speeds.

73,
Wayne
N6KR



> On Jun 22, 2020, at 10:51 AM, Roger D Johnson <n1rj at roadrunner.com> wrote:
> 
> Unfortunately, the APF is too narrow for 160m with all the lightning noise.
> As I recall, we've been promised wider selectivity choice(s) but nothing ever
> happened.
> 
> 73, Roger
> 
> 
> On 6/22/2020 12:27 PM, John Gibson wrote:
>> Each Sunday evening, I use my K3 #820 to try to check into Kevin’s 20m Elecraft CW net. Kevin in Oregon is almost 1900 miles from me in Michigan, and I succeed only because I have a modest tri-band beam antenna at 60 ft.
>> 
>> Current propagation conditions make this especially challenging. Sometimes Kevin is so buried in noise that I find him only because I can recognize the rhythm of his sending.
>> 
>> Last evening, conditions were poor. I tuned all around the net frequency and could hear nothing of Kevin. Then I turned on my K3's Audio Peaking Filter (APF), searched again, and found him, and he was loud! When I turned off the APF, he vanished. I did check into the net.
>> 
>> My K3's APF made all the difference between hearing Kevin and not finding him. I am impressed that it worked so well. I thank Wayne N6KR for creating this feature for the K3.
>> 
>> 73,
>> 
>> John, no8v
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