[Elecraft] K2 Sidetone

[Stewart Baker]

Although I am not really a CW man I spent a few hours in the recent BERU 
contest. After a while I began to get a bit 'fed up' with the raspy sidetone, 
and looked at the reflector achieve for a solution. I saw that G3SJJ had 
recently done a mod that involved adding a small board to hold the components.

I was almost about to go this route but found that this method of modification 
would likely get in the way of the K2DSP board that sits above it. So here is 
what I did.

a) I removed C33 and L1.
b) I soldered C33 (2.2uF) in the L1 position
c) I stuck L1 to the BACK of the PCB close to C33 pads with double sided tape
d) I soldered  the (+) terminal of a 1uF capacitor to C33 (+) pad
e) The other leg of the 1uF is soldered to L1
f) The circuit is completed by soldering a 100 ohm from L1 to C33 ( -) pad

This way all components except the 2.2uF capacitor are now out of the way on the 
back of the control PCB.
The improvement in sidetone quality achieved has been very noticeable.

73
Stewart G3RXQ