[Elecraft] K3: Rough audio with amp even using voice recorder

[Ignacy]

I did extensive testing with amp on/off, eq on/off, a different microphone,
as suggested. Differences are not dramatic.
What seems to be going is that the voice becomes distorted past 12W at K3.
Linear at 12W and scratchy at >12W. A bit better at 100W.
I looked at currents with no signal.  1.1A in RX. 1.9A at 12W. 2.0A at
>12W. High power turns on HPA, and it seems that the idle current for HPA
should be > 0.1 A.  At whistle: 3.5A at 12W and 20A at 100W.
Ignacy

On Tue, Sep 16, 2014 at 8:49 PM, Jim Brown-10 [via Elecraft] <
ml-node+s365791n7593171h31 at n2.nabble.com> wrote:

> On Tue,9/16/2014 1:16 PM, Ignacy wrote:
> > I reduce power in K3. Note that the problem occurs with the voice
> recorder.
>
> Good. I agree with Don -- RF feedback or excessive TXEQ are
> possibilities. How is your TXEQ set? Is anything boosted? Are the bottom
> three bands turned way down? What mic, how is it wired, how/where do you
> plug it in? Were you transmitting with the amp when you recorded the
> messages for the voice recorder?
>
> I also agree that you should try to listen with the KX3 with its antenna
> disconnected.
>
> 73, Jim K9YC
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