[Elecraft] K2 SSB Performance Improvement

[Jim Brown]

On Sat,12/20/2014 2:29 PM, Ray Collins wrote:
> After getting many reports of poor quality transmit audio with my K2 (using the Proset K2 Heil boom microphone and headset), I carried out the modifications described by G3RXQ which increase the lower cut off frequency of the microphone circuit on the KSB2.  This involves changing C34 from 2.2uF to 1uF, C31 from 2.2uF to 1uF and C20 from 0.33uF to 0.1uF.

I did something quite similar (maybe even those values) with my K2 back 
around 2004. I also increased the load impedance of the input and 
another stage to add a few dB of gain so that I would hit the limiter 
harder.

73, Jim K9YC