[Elecraft] K2 Sidetone

[G3SJJ]

Yes, I did wonder about the K2DSP. Haven't got one here, yet!  The mod 
certainly makes a difference though.

Keep up the CW, Stewart!

73 Chris G3SJJ


Stewart Baker wrote:
> 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
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