[Elecraft] [K3] K3 Distorted Sound while using AM

[Richard Jones - KJ5QY]

Hey Bob,

Sorry for not getting back to the board been a busy day.  I have checked all
the wiring.  I have tried the 6hz AM filter.  This really has me stumped.  I
will give Elecraft a call the first part of the week and see what we can
come with.

Thanks,

Rick



Bob Naumann wrote:
> 
> 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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> 
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