[Elecraft] [K3] K3 Rev C DSP with Low Freq Enhancement

[Eric Tichansky]

Paul Christensen wrote:
> Take a look at what's happening before the ADC and after the DAC circuits. 
> The K3 has some of the best designed audio circuits for a communications 
> transceiver.
>
> Paul, W9AC 
>
>   
Unfortunately, the issue with the 12 kHz leakage (DAC clock?) and beat 
notes (+/- CW sidetone around 12 kHz) make for some awful audio in CW.   
I guess most folks don't hear it, but given previous reports from 
others, it is an issue.  I can't comfortably use the K3 for CW unless 
using outboard low-pass audio filters to knock the high end garbage down 
to an in-audible level.

73
Eric NO3M