[Elecraft] K3 audio

[Jack Smith]

There is a 3.9 KHz digitization artifact about 78 dB down from normal 
audio level. Is this what you hear?

It's quite visible in a spectrum analyzer view of the K3's audio output.

http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm - about 
half way down the page under Headphone Port SSB Mode with 500 Hz Tone - 
Harmonics

Jack K8ZOA


Evert Bakker (PA2KW) wrote:
> Hi Don,
>
> It is definitely not band-noise what I'm talking about.
> You need a decent signal level (audio strength) to hear it.
> For me, I'm quite sure it has to do with the digitalization. That sound is
> far from natural and is ADDITIONAL to the normal audio signal. That addition
> sounds sharp, metallic, like these "extreme low cost" jingle bell" sounds in
> all kind of gifts (sorry for the comparison between these two). But it is
> "next" to the normal signal and many db's down. That's why I called it the
> silver line around the cloud in the beginning.
> The normal signal sounds OK, not as "comfortable" like my TR7 audio but very
> good for normal use as we do (at least for me). I just would like to get rid
> of this higher freq component which doesn't like to be influenced by
> whatever control except the power and volume button :-) .
>
> I've got 2 K3's and they both give me the same result.
> I played with all kind of controls (RX-EQ, AGC-SLP/THR, AGC-S/F, AGC ON/OFF)
> and there is no difference whatsoever!
>
> I apologize for being persistent in this.
>
>
> 73's, Evert PA2KW
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
> Sent: Monday, April 06, 2009 00:21
> To: Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 audio
>
> I hear no evidence of any "hissy" receiver noise - very quiet.
> My conclusion from that is the "hissy" sound is not from the K3 internal 
> noise.
>
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