K3 Audio instability

[Mark Pride]

 Recently noticed a problem with receive audio.  Hear a crackling sound while using the headphones and that noise does NOT vary as a function of the AF gain control.  It comes and goes, very random and very objectionable.  Almost like hearing instability in the audio stage of an old vacuum tube receiver - if I can coin it that way?

Suggestions for the cause and fix?

Regards,
Mark, K1RX
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[Bill-3]

Do you have the Auto-Notch filter on when this happens? If you do, try
adjusting the AGC SLP down to about 6.

I have found that using a setting higher up results in a very annoying
warble effect.

Bill W2BLC K-Line

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[Oliver Dröse]

Broken or loose cable?

73, Olli

--

Contest, DX & radio projects: http://www.dh8bqa.de


Am 20.03.2014 17:01, schrieb Mark Pride:

>   Recently noticed a problem with receive audio.  Hear a crackling sound while using the headphones and that noise does NOT vary as a function of the AF gain control.  It comes and goes, very random and very objectionable.  Almost like hearing instability in the audio stage of an old vacuum tube receiver - if I can coin it that way?
>
> Suggestions for the cause and fix?
>
> Regards,
> Mark, K1RX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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>

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[mikerodgerske5gbc]

Make sure NR and especially NB not set too high.

73
Mike R

RIP- Mr 500.  STP's Andy Granatelli from racing fans everywhere.
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[k5oai]

I have sometime heard this when my Notch was activated.

On 3/21/2014 7:55 AM, [hidden email] wrote:
> Make sure NR and especially NB not set too high.
>--
GB & 73
K5OAI
Sam Morgan
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