Re: K3 Loses RX Audio at BW of 2.8 kHz

Posted by Paul - WW2PT on Feb 07, 2010; 7:07am
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4528359.html

My K3 was working fine last time I used it. Tonight I turned it on and  
noticed a similar problem -- no audio in USB or LSB modes whenever I  
set the width to 3.00 kHz or less. Tried downgrading from 3.76 to 3.63  
but no change. Checked all filter settings in the config menu, nothing  
out of place. All other modes were fine.

On a hunch, I restored my last configuration backup file. It worked!  
Everything seems to be behaving well again.

73 de WW2PT




On Feb 6, 2010, at 12:45 AM, Scott Prather wrote:

> All: This evening when running FW 3.76 I'm seeing a problem with my  
> K3 that
> I've never seen before.
>
> When the K3 is in the LSB, USB or AM mode, adjusting the bandwidth  
> down to
> 2.8 kHz will result in total loss of audio, even though the S-meter
> continues to read incoming signal strength. I've tried an EE-Init and
> reloaded the configuration, but the problem remains. Thinking this  
> might be
> related to 3.76, I went back to 3.30 and I have exactly the same  
> problem. If
> I turn on the sub receiver and change its BW using BSET, it loses  
> LSB, USB
> and AM audio at 2.8 kHz as well. To get audio to return, all I need  
> to do is
> change the BW to 2.9 kHz or greater on either the main or the sub.
>
> Looking through the reflector postings, it looks like someone saw  
> something
> similar to this in the DATA mode a few months back, and pressing the  
> A/B key
> would clear it. However, in my case the only way I can restore audio  
> is to
> change the BW to 2.9 kHz or greater. In the CW and DATA modes, the  
> audio
> does not drop out at any bandwidth setting.
>
> Does anyone have a suggestion as to what might be going on?

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