[Elecraft] K3 Distorted Sound while using AM

[Bob Naumann]

Sorry - I missed that you said you have this on the internal speaker also.

Very strange.



-----Original Message-----
From: Bob Naumann [mailto:W5OV at W5OV.COM] 
Sent: Sunday, December 06, 2009 8:20 AM
To: 'Richard Jones - KJ5QY'; 'elecraft at mailman.qth.net'
Subject: RE: [Elecraft] K3 Distorted Sound while using AM

Have you checked the wiring to your external speaker?

After the addition of the sync AM I have zero distortion on AM signals with
my K3 - I have the 6kHz filter for AM.

73,

Bob W5OV

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Richard Jones - KJ5QY
Sent: Saturday, December 05, 2009 11:50 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Distorted Sound while using AM


Hey Joe,

Thanks for the fast reply!

No,  I do not have the AGC Off, nor have I changed any of the "settings"
within the AGC (Menus).  I should have stated that in my original post. 
Anyway,  I am really stumped as what the problem is.  

If you happen to have a K3 equipped as mine,  could try to listen to an AM
station with the "Volume" turned up, to see if you are receiving the
distortion?

I should have been more specific,  the radio is totally loaded.  It does
have the 8 Pole filters in both receivers.  From my recollection I have the
following filters:  250 Data & CW,  2.1 for SSB, 2.8 for SSB, and 6 for AM,
and 13 for FM.  I hope this makes it a litter clearer and not more
confusing.

Thanks Joe,

Rick



Thanks,

Rick



Joe Planisky wrote:
> 
> 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.
> 
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