[Elecraft] K3 QSK

[Frank Ross W4NHJ]

Tony

I ran my K3 through your test and I have the thumps also.  If I switch to 
Simi the thumps go away, but if I turn the delay down to 2, 1 , 0 the 
thuumps reappear. I do not have to turn my AF gain up very far to begin 
hearing the thumps.  At my normal listining level they are quite noticable. 
It appears this problem may only exist in newer K3s.  MY SN; 3121.

Frank - W4NHJ

----- Original Message ----- 
From: "Ron D'Eau Claire" <ron at cobi.biz>
To: <Elecraft at mailman.qth.net>
Sent: Thursday, June 25, 2009 7:54 PM
Subject: Re: [Elecraft] K3 QSK


>I sat down in TEST mode and tried all the combinations you mentioned again
> and can't produce thumps. I even tried every possible combination of AF/RF
> and MON levels with no thump.
>
> So I'm sri to say obviously something is different between our rigs and
> setups, but I can't imagine what.
>
> The only audio mod involving a change on the main board is to change a
> choke, not a cap. It reduces the resistance of the choke to improve the
> voltage regulation at the AF Amp. I've made that too. When I said my K3 
> was
> "stock" Elecraft, it does have the Elecraft-approved and documented mods
> made while writing the app notes.
>
> I asked wondering if the capacitor changes some have made to improve the
> low-frequency response were making the low frequency 'thumps' stronger and
> audible. If you've not done them, we should have similar rigs.
>
> Ron AC7AC
>
> -----Original Message-----
>
> The only audio mod made to both rigs deals with the cap change on the 
> corner
> of the main board. Also, you don't need to be transmitting. You can hear 
> the
> thumping in the TEST mode.
>
> 73,
> N2TK, Tony
>
>
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