[Elecraft] Sherwood Engineering Tests

[Brendan Minish]

I was one of the people who could most definitely hear the DSP artefacts
above 12Khz prior to the DSP low pass filter upgrade.

The low pass filter upgrade completely resolved it for me, this along
with the various other changes over the years now has the K3 sounding
very good to my ears.  

Do make sure that the speakers and headphones you are using are
reasonably efficient so that the K3 can drive them effectively without
having to run the AF amp 'flat out'  

For speakers I use a couple of old Motorola 2way radio speakers (3 Ohm
impedance I think).
As a headset I generally use a beyerdynmic DT-109 with 50Ohm earpieces,
this works wonderfully with the K3 but as I am a fairly soft talker I
made up a small preamp for the mic element 
http://ei6iz.com/?p=28

  

On Tue, 2015-02-24 at 09:48 -0800, Wayne Burdick wrote:
> 
...
> Or you can add just the audio filter section as a small daughter board
> for $39 (K3DSPLPF).
> 
> The upgrade does improve the spectra as viewed on an audio spectrum
> analyzer, but many operators won't be able to hear the effects by ear.
> Those who can hear them have told us it was a major improvement.
> 
> Wayne
> N6KR


-- 
73
Brendan EI6IZ