[Elecraft] K2 Audio Thumping & Shutdown Noise

[Don Wilhelm]

Bill,

For issue 1, check the 8R setting in the menu - it is under the T-R menu 
parameter (see the K2 manual page 89 left column) - a HOLD of the 
DISPLAY button will toggle the setting.  It should normally be set to 
HOLD.  If you have it set to 'nor', the receiver will unmute without 
delay and you will have thumps at the end of each character.  You should 
also check the setting of the T-R delay setting, if set to zero, that 
may be causing your problem - a setting in the 02 to 06 range is normal.


On issue 2, that is the sound of the large capacitor in the audio output 
dumping its charge when power is turned off.  It happens on all K2s and 
I do not know of any way to prevent that.

73,
Don W3FPR

On 5/28/2013 8:39 AM, K4GDR wrote:
> I have two audio issues with the K2 that I would appreciate help with:
>
> 1. During CW keying I hear a "thumping" sound in the sidetone.  Per
> suggestion from Elecraft Support, I grounded the microphone jack to the
> Front Panel Board but it did not help.  I tested into a 50 ohm dummy load to
> be sure "thumping" was not due to mismatched antenna.  This also did not
> change the "thumping" sound.
>
> 2. The other audio issue is a loud "crashing" sound in the speaker when I
> shut the rig off.  It sounds like a loose speaker connection -- a very loud,
> scratchy noise as the radio shuts down.
>
> I noticed these issues prior to installation of any options.  I have since
> added the 160, 60 meter, ATU, KIO2 options; noises unchanged after
> installation.
>
> Other than these two issues, the K2 works great.  Suggestions welcome!
>
>