[Elecraft] K3 QSK

[Steve Ellington]

Ron
Are you serious about the AF gain at 12 o'clock? No wonder you hear thumps! 
Mine is just barely cracked open or almost fully counterclockwise. If I 
turned it up 9 o'clock it would likely spin my ceiling fan and peel the 
paint off the walls!!! So what kind of speaker are you using? I bet it's one 
of those "HI-FI" jobs with a big magnet made for a typical stereo system. 
I'm using an old Heathkit HS-1661 which has a small magnet and 1/2 watt will 
blow you away.

Steve
N4LQ
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Ron NA9F" <rjhinton at verizon.net>
To: <elecraft at mailman.qth.net>
Sent: Thursday, June 25, 2009 9:31 AM
Subject: Re: [Elecraft] K3 QSK


>
>
> Steve,
>
> Here is what I found out and have reported the thumping. Was told it would
> be fixed.
> You can still use full QSK by following turning down the AF or RF gain 
> some.
> Ref the
> following. It is a copy of what I reported to Elecraft.
>
> I finally figured out the thumping noise we heard while in QSK mode.
> Discovered this in the evenings when the band was noisy and the signals 
> were
> weak.
> Another ham with a K3, turned up the RF gain and AF gain so he could pull 
> my
> signal up. We were both using QSK.
> He heard this thumping and for the next hr we tried to figure what the 
> cause
> was. Today I tried several things in an effort to
> duplicate the thumping. I finally hit the combination that causes it.
> See if you can duplicate this:
>
> 80M or 40M
> CW mode
> QSK
> AF GAIN ON HI or LOW
> RF gain at about 3 o'clock to full open (clockwise).
> AF gain knob at 3 o'clock or above.
> Transmit either on air or TX Test mode.
>
> You will hear the thumping sound? Now turn down AF gain unit it goes away.
> Or you can turn down RF gain and all is well.
>
> The default or and other AGC settings has no affect on the thumping.
>
> Solution is not to turn the RF gain up above about 1 o'clock if the AF 
> gain
> is about 12 o'clock or Keep the RF gain below 12: o'clock
> if you have the AF gain above about 3 o'clock.
>
> Ron NA9F
>
>
>
>
>
> Thumping? If this K3 started that stuff, it would be out the door faster
> than a scared cat. Good QSK is hard to come by and it really surprises me 
> to
> hear these comments. I mean come on now....."A friend noticed thumping" 
> and
> with "Certain settings of the front panel" Certain settings? Is that in 
> the
> manual?
>
>
> -- 
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> http://n2.nabble.com/K3-QSK-tp3146071p3155027.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
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