[Elecraft] K3 QSK

[Ron NA9F]

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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