[Elecraft] K3 MCU 2.38 Software Bug?

[Ken K3IU]

Same thing here, Don, even though I have a slightly different filter 
setup. When selecting Mode AM and then tapping XFIL, the width drops 
down to narrow (Low 0.80; High 2.20) indicating the 2.8k filter. Tapping 
XFIL again takes me back to the main AM Filter (FL 1, 6K, in my case) 
and bandwidth returns to normal. There is definitely an anomaly there.

73,
Ken K3IU
K3 #202

Don Nesbitt wrote:
> Basic Parameters:
>
> K3/100 with KRX3 - MCU 2.38, FPF 00.02, DSP1 1.90, DSP2  1.90
>
> Main Board:  FL2 = 2.8; FL3 = 2.1; FL4 = 400 Hz
> Sub RX Board:  FL2 = 2.8; FL4 = 400 Hz
>
> AM Rx Enabled for FL2 Main and FL2 Sub
> AM Tx not Enabled
>
> I do NOT have a 6.00 AM Filter but am listening to AM through my 2.8 roofing
> filter - which sounds pretty good!
>
> Action:  Set Mode to AM.  Displayed Mode changes to AM and displayed XFIL
> changes to FL2 (which would be expected as I have a 2.8 in FL2 and it is
> enabled for AM receive) with "High" showing 3.00 and "Low" showing 0.00.  BW
> shows 6.00. FC shows 1.50.
>
> Surprise Action - Possible "Bug"
>
> Now Tap "XFIL" button.  Displayed XFIL stays on FL2 - but - bandwidth gets
> very narrow.  "High" now shows 2.20 and "Low" shows 0.80.  FC still shows
> 1.50 and BW now shows 2.8. But, the graphic display of bandwidth narrows to
> what would be shown if I had BW set to 400 Hz and the recovered AM audio
> sounds like it!  The BW showing 400 Hz is as it should be since 2.20 - 0.80
> is 400 Hz.
>
> Press and release "NORM" and I am back to where I started with Rx as it
> should.  Even if I "Normalize" I and II so all is well and then do the "tap"
> the "narrowing" scenario repeats!
>
> What I've Tried:
>
> I've downloaded and sent "All Firmware to K3" twice with the same result.
>
> I've used the K3 Utility Version 1.1.6.3 to verify the filter settings that
> I made in the Config Menu.
>
> I've used the K3 Utility to set the filters and verified them in the Config
> Menu.
>
> I don't know if this action occurred in previous versions as I've stayed up
> with all Beta releases but frankly never tapped the XFIL button before while
> listening to AM.
>
> Questions:
>
> Can anyone duplicate this seemingly strange action when in AM mode and
> tapping the "XFIL" button?
>
> If it can't be duplicated, any idea(s) what I've got set incorrectly?
>
> Is this simply a consequence of not having the 6 kHz AM filter and listening
> to AM with the 2.8?
>
> Thanks in advance.  '73 es gud dxing -- Don N4HH K3/100/KRX3 #83
>
>
>
>
>
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