[Elecraft] K3 MCU 2.38 Software Bug?

[williamsonr at pbtcomm.net]

Same here.  I have the 10Khz FM, 2.7 and 1.8.  Use the FM filter for AM rx.  See the same behavior others are describing with 2.38.

Rodger

---- Original message ----
>Date: Thu, 18 Sep 2008 20:50:38 +0200
>From: "Steef PA2A" <pa2a at xs4all.nl>  
>Subject: Re: [Elecraft] K3 MCU 2.38 Software Bug?  
>To: <drnesbitt at bellsouth.net>, <elecraft at mailman.qth.net>, <k3support at elecraft.com>
>
>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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>
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