[Elecraft] Firmware 4.18 APF adjustment using shift control

[Ken K3IU]

K3 #202, MCU 4.18, et al.
Similar experience here. Everything normal until I rotate 
the APF Shift CW and it reaches 1.00 the loud pops/cracks 
begin when rotating both the "Shift" and "Width" knobs. 
Rotation of the APF Shift knob now changes the display 
numbers (APF 0.xx), but the Rx is very quiet... both 
speakers and earphones. Powering K3 OFF/ON returns the K3 to 
normal operations. When I cycle back to APF Off (Preset II 
on my K3), Rx works normally with sound in both speakers and 
earphones. The first time I switched back to Preset I (APF 
On) the Rx worked as it should. Subsequently, switching back 
to Preset I produces a quiet Rx with only the popping when 
the APF Shift or Width being rotated.

73,
Ken K3IU

On 11/6/2010 7:46 AM, Len, K3LJ wrote:
> Gentlemen, thanks for adding the APF to the K3 and the quick response to the
> bug that some operators were experiencing. The APF works great. I did find
> that while adjusting it when I got to APF 1.0 I heard a click in my
> headphones that I am using and as I tried rotating the shift control counter
> clockwise or clockwise that I could here the APF "stepping" but there was no
> visible indication on the display of it or any receiver audio heard. Just
> the clicks as I turned the shift control. Turning off the rig and turning it
> back on brought everything back to normal.
>
> 73,  Len  K3LJ