Audio Nulling in my K3 in Diversity Update = Solved

Posted by Dave Anderson, K4SV on Dec 16, 2010; 5:00am
URL: http://elecraft.85.s1.nabble.com/K3-Ameritron-RCS-12-tp5820821p5840893.html

Hi Guy et All,

Sure enough this only happens using an external speaker, the headphones work
fine.  Sorry for not seeing this earlier.

I do have SPKRS set to 1.  So it appears that when using diversity one must
use Stereo speaker output and or Headphones.

Mystery solved, Thanks for the quick answers

73

Dave Anderson, K4SV
Tryon, NC
828 777-5088

www.K4SV.com



----- Original Message ----
From: Guy Olinger K2AV <[hidden email]>
To: "Dave Anderson, K4SV" <[hidden email]>
Sent: Wed, December 15, 2010 9:08:41 PM
Subject: Re: [Elecraft] Audio Nulling in my K3 in Diversity

The main ways of getting audio nulling on diversity are setting
CONFIG:SPKRS to 1, or having the left and right speakers actually
shorted out somehow, or getting one speaker cable to one speaker
flipped, and the other not.

Any of those?

73, Guy

On Wed, Dec 15, 2010 at 8:55 PM, Dave Anderson, K4SV <[hidden email]> wrote:

> Hi All,
>
> For the last few weeks I have used the Diversity on the low bands with good
> success.
>
> Tonight I came into the shack and found my K3 acting strange.  While in
> diversity, 4SQ hooked to main RX antenna port and Beverages hook to AUX port,
> the same configuration I had for weeks.  As I tune the band, the audio nulls
>out
>
> about every 0.5KHz where the audio gets very low.  The S meter seems

unchanged,
> only the audio is affected.  I switched back to Normal receive and sounds
fine.
>  Then back into Diversity and I get this nulling of the audio again.  Sounds
as
> if a
> Auto notch was enabled, buts its OFF.
>
> The radio has been left for three weeks continuously.  I recycled power
without

> change.  I am running the latest MCU 4.22 / DSP 2.70 / FPF 1.14, 11-15-2010
>
> I could speculate what it might but I bet this has been seen before.  Maybe a
> operator thing but nothing was changed in the radio from the last time I used
>it
>
> and it worked fine.
>
> Suggestions?
>
> Thanks in advance,
>
> Dave Anderson, K4SV
> Tryon, NC
>
>
> www.K4SV.com
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