[Elecraft] K3 Distorted Sound while using AM

[Joe Planisky]

Hi Rick,

Do you perhaps have AGC turned off and the AF LIM set to a value of  
less than 30?  The distortion and eventual cutting out of audio at  
high levels you are describing sounds a lot like the intended AF  
limiter action.  If so, the solution is to either turn on AGC, or  
increase the AF LIM setting closer to 30.  I find an AF LIM setting of  
28 allows as much dynamic range as I want while still protecting my  
tender ears from various pops and static crashes.

The AF limiter is intended to protect your ears and speakers from  
unexpectedly loud signals when AGC is turned off.  It will prevent the  
output from exceeding the preset value at the expense of distortion.


73
--
Joe KB8AP



On Dec 5, 2009, at 8:50 PM, Richard Jones - KJ5QY wrote:

>
> Hello,
>
> I am having a problem when I go into AM, or AM sync.  Example:  I go  
> to an
> AM Shortwave station.  If I turn the AF gain past approximately 3/4 or
> farther the radio starts to "Stutter, Distort, and finally the audio
> disappears.  I cannot make out what is coming out from my speaker.   
> The
> audio is completely distorted or gone.  I noticed I could rotate the  
> Af gain
> (Counter Clockwise) and it would go back to less distortion.  I did  
> check
> the external speaker jack and also unplugged it only to find the same
> problem.