[Elecraft] No CW sidetone on K2

[Don Wilhelm]

Bob,

It is quite likely that you inadvertently changed the sidetone source in 
the menu.  The proper sidetone source for K2s above SN 3000 and all with 
either the KIO2 or the KPA100 installed is U8-4.

First go into the menu for ST L and set the level to something you are 
bound to hear - try the range of 25 to 30.
Now enter the menu for ST P and hold EDIT to edit the parameter.  Then 
tap the DISPLAY button to toggle the sidetone source.  Stop tapping when 
you hear sidetone, and exit the menu.

If that does not produce sidetone for you, you may have a hardware 
problem.   If your K2 serial number is less than 3000, check the back of 
the control board, you will see a wire going to U8-4, be certain it is 
securely soldered (see the KPA100 installation manual).
Also if your SN is less than 3000, and the A to B upgrades have been 
installed, there is one resistor and a shielded inductor that have been 
added to the back of the board - make certain that they are properly in 
place (see the A to B upgrade instructions).

If all that is intact and the source is correct, and you still do not 
have sidetone, you may have a firmware failure.

73,
Don W3FPR

R K Johnson wrote:
> Hi,
> I added the KAT100 to my K2-100 and lost my cw sidetone. It was working find
> before I connected the tuner, and afterwards no transmit sidetone whatever.
> And I don't have a sidetone anymore when I completely disconnect the tuner.
> Any ideas about what I might have set on the menu system (or in the hardware
> itself) that turned it off? It transmits fine, tunes wonderfully, etc, but I
> can't hear myself keying.
>
>