Re: K3 Loses RX Audio at BW of 2.8 kHz

Posted by Scott Prather-2 on Feb 06, 2010; 6:01pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4526252.html

Jeff: Thanks for the suggestion concerning the K3's filter configuration,
however, I'd already checked this. According to the K3 Configuration
Utility, FL3 is enabled for LSB, USB and AM in both receivers. Another point
to keep in mind is that FL3 is only selected at a BW setting of 2.7 kHz or
below, FL2 is still used at 2.8 kHz.

I just received the DSP board upgrade yesterday and intend to install it
this weekend. However, I thought that before I make any hardware changes
there might be some value in trying to determine what happened in case the
swap-out clears this issue.

Scott
N7NB





-----Original Message-----
From: Joe Planisky [mailto:[hidden email]]
Sent: Saturday, February 06, 2010 7:09 AM
To: Scott Prather
Cc: 'Elecraft Reflector'
Subject: Re: [Elecraft] K3 Loses RX Audio at BW of 2.8 kHz

Hi Scott,

Just a shot in the dark: Have you checked your filter configuration?    
If you happen to have an empty slot enabled for those modes, you'll  
get exactly the behavior you described.  Use the K3 Utility to look  
for a slot that you know to be empty but with the Bandwidth set to 2.8  
and the LSB, USB, and AM boxes checked.

73
--
Joe KB8AP

On Feb 5, 2010, at 10:45 PM, 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.

...

>  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.
>
...

> Does anyone have a suggestion as to what might be going on?
>
> Tnx.
>
> Scott
> N7NB

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