K3 dsp rev D hiss audio

[Juha - oh6os]

Hello,

I have now K3DSPUPGD (Rev D). A lot of good, but... there is one drawback. I noticed more hiss on audio (Heil headphones) even AF gain off! I had Rev B and that was very quiet. That hiss is very notable on CW with narrow filter. It is fatique to listen white noise.

What experience you have? Is this feature of new LPF on  DSP board?

juha - oh6os
K3 sn 2100
k2 sn 4781

[Steve Ellington]

I upgraded too and the residual audio hiss level stayed about the same. Hiss
bugs me too. The cure is to plug one of these
http://www.radioshack.com/product/index.jsp?productId=2102975 in series with
your headphones, turn the K3's AF gain to minimum then adjust the adapter's
control until the hiss just barely disappears. That will take care of the
residual audio hiss. Works with any headphone.
P.S.You will need a 1/4" to 1/8" stereo adapter.

Steve
N4LQ
----- Original Message -----
From: "Juha - oh6os" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, May 30, 2010 4:35 PM
Subject: [Elecraft] K3 dsp rev D hiss audio

>
> Hello,
>
> I have now K3DSPUPGD (Rev D). A lot of good, but... there is one drawback.
> I
> noticed more hiss on audio (Heil headphones) even AF gain off! I had Rev B
> and that was very quiet. That hiss is very notable on CW with narrow
> filter.
> It is fatique to listen white noise.
>
> What experience you have? Is this feature of new LPF on  DSP board?
>
> juha - oh6os
> K3 sn 2100
> k2 sn 4781
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-dsp-rev-D-hiss-audio-tp5119613p5119613.html
> Sent from the [K3] mailing list archive at Nabble.com.
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