[Elecraft] K3 upgrade to K3S question

[Don Wilhelm]

Gernot,

The DSP board upgrade did two things.

It added a Low Pass Filter to reduce the high audio filter response 
which eliminated some high frequency 'hiss' that some operators objected to.

Secondly, it changed some capacitor and resistor values which enhanced 
the low frequency response.

You can do the DSP board swap if you want both.
But if you are only interested in the high frequency end, Elecraft 
provides an inexpensive kit to add the LPF to your existing DSP board. 
That was my choice because I was not interested in the extended low 
frequency response.

73,
Don W3FPR

On 3/12/2017 6:37 PM, gt-i at gmx.net wrote:
> Bill,
>
> Good to know there is a DSP Update - didn't recognized it yet. Rev C is
> installed so the only difference to Rev D is the 4 kHZ Audio LPF. Did
> you encounter situations with a noticable enhancement using the LPF?
> 73 Gernot, DF5RF