[Elecraft] K3 QSK

[Ron NA9F]

Hello Steve,

You are just like I am when it comes to RF and AF settings. I only worked to find why Toby was hearing the thumping and ran across this. With our settings we will never hear it but if someone runs the RF gain wide open they will. Not sure why a person would want to run the RF wide open.

Ron NA9F
  ----- Original Message ----- 
  From: Steve Ellington (via Nabble) 
  To: Ron NA9F 
  Sent: Thursday, June 25, 2009 11:56 AM
  Subject: Re: [Elecraft] K3 QSK


  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 ... 
  ----- Original Message ----- 
  From: "Ron NA9F" <rjhinton at ...> 
  To: <elecraft at ...> 
  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? 
  > 
  > 
  > -- 
  > View this message in context: 
  > http://n2.nabble.com/K3-QSK-tp3146071p3155027.html
  > Sent from the Elecraft mailing list archive at Nabble.com. 
  > 
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