[Elecraft] K3 Filter Switching Problem?

[Matt Zilmer]

I suggest you submit this directly to K3support at elecraft.com.   It
sounds like a bug.  Or perhaps an omission from the Owner's Manual.

73,

matt - WA6EGJ
K3 # 24

>Warning! K3 filter use item follows.
>
>Currently, I only have the standard 2.7 KHz filter in the FL3 slot on 
>the RF board.  I chose this location due to potential future additions 
>of the 2.1 and 1.8 KHz filters, in slots FL2 and FL1 respectively.
>
>Here is what I observe: With FL3 manually selected via the XFIL button; 
>when I try to rotate the Width control below a value of 2.7 KHz, the 
>rig automatically switches to the FL1 position, which is empty.  The 
>receiver goes dead.  When I quickly reverse the Width adjustment, FL3 
>is not switched back.  I have to manually select FL3 again with the 
>XFIL button.  Once back in FL3, I can adjust the Width control to 
>higher values above 2.7 KHz with no problem and the passband gets wider.
>
>Is this normal?  I thought the DSP circuit would continue to narrow the 
>passband even though the roofing filter is broader.  But, why does it 
>switch to an empty filter slot?  Did I do something wrong during the 
>Configuration setup?
>
>Is this a firmware issue?  I have not downloaded the latest updates yet.
>
>If I had narrower filters in the FL1 and FL2 slots, then I would expect 
>the circuit to auto-switch to those as I narrowed the passband via the 
>Width control.  And, they should switch back in reverse order as I 
>widen the passband.  Right?
>
>73,
>Henry - K4TMC
>K3 #98
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