[Elecraft] K2 -- RX audio

[Stewart Baker]

Useful mod Matti. My K2 audio now sounds much rounder.

Gave me something to do while waiting for the next puff of white smoke from 
Aptos.

73
Stewart G3RXQ
On Wed, 31 Oct 2007 16:48:53 +0000, Marteinn Sverrisson wrote:
> Hi
>
> While trying to improve the K2 RX audio response specially for SSB,
> I noticed lack of low frequencies, looking at the schematics I find
> the the LP cutoff is abt 640 Hz, determined by C25, C26 and the 5k vol
> pot ( this is wheather using DSP or not).
> By increasing C25 and C26 to 0.2uF (from 0.1uF) the LP cutoff is
> moved to abt 320 Hz. This makes better sounding SSB signals and also helps
> in CW mode when copying low pitch signals.
>
> To lower the LP cutoff, I soldered 0.1uF SMD caps across
> C25 and C26 on the control board. To my ears K2 now sounds better.....
>
> 73, Matti
>
> ps. I use 2.4 kHz X-Tal filter