[Elecraft] K3 MCU 2.38 Software Bug?

[Steef PA2A]

Don,

I have found the same problem. I have the 6K, 2K8, 500, 400 and 250 Hz at 
the moment. All three narrow filters show LO 0.85 and HI 2.15 in AM mode. 
The BW shown during switching from HI to BW is 2.70 and not 500, 400 and 250 
Hz as one would expect.

I am wondering why the center frequency *1.50 always remains constant for 
all filters in SSB. When lowering the bandwidth to 1 KHz, signals can be 
heard best at a lower shift of about 0.65 KHz. With my K2 I used the CW 
audio filter at 550 Hz sometimes to copy  SSB stations with adjacent strong 
signals.

73 's Steef PA2A
K2 4654
K3 1184


----- Original Message ----- 
From: "Don Nesbitt" <drnesbitt at bellsouth.net>
To: <elecraft at mailman.qth.net>; <k3support at elecraft.com>
Sent: Thursday, September 18, 2008 7:06 PM
Subject: [Elecraft] K3 MCU 2.38 Software Bug?


> 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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