[Elecraft] K3 RX AUDIO

[Don Wilhelm]

Mike,

If that 'hiss' is reduced when the bandwidth is reduced, then it is 
atmospheric noise that you are hearing, not any internally generated noise.

The audio LPF that was added to the DSP board has a cutoff frequency 
somewhere near 3.4 kHz if I recall.  There is little falloff at 
frequencies lower than that.
The K3 does have a very flat passband with steep skirts out to the 
hi-cut value.  I am guessing that the flat passband is what is bothering 
you.

73,
Don W3FPR

On 7/21/2013 7:18 PM, mikerodgerske5gbc at yahoo.com wrote:
> I think the audio voice quality has been remedied long ago.
> What lingers is the high end hiss that I and a few others hear. Apparently this only bothers a minority.
> On my 5047 it occurs with hi cut of about 2500 and gets worse to 3000. If you run bandwidth 2.1 or below you will never hear it. 2.4 probably hear it some.
> It's most prevalent scanning a vacant band 6-20. Not as noticeable when people are talking.
> On the noisier bands I'm not sure you hear it at all. I was on 40 the other night using NR and didn't hear it.
>
> This issue in general comes up frequently on other groups and is negative press. It's usually called something like fatigue factor like during a contest. I think some of this is holdover and bad press before the dsp upgrade several years ago. I don't see anything wrong with the audio itself, just the high end hiss. My top 3 eq bands at -16 by the way.
> Something that comes up also is how well the k handles lightning noise spikes in agc and why can't others do it? That's positive press.
>
>